Field of the Invention [0002] This invention relates generally to safety devices for use in, for example, the construction industry, and, in particular, to a scaffold supporting standing seam roof bracket which is adjustable for use on roofs having a wide range of pitches, and which has a brake mechanism for ensuring the stationary positioning of the bracket on roofs.

Related Background Art [0003] In the construction and repair of buildings, builders often must work on inclined roof decks. One known type of roof deck has roof panels that fit together at standing seams. The standing seams typically extend across the roof, and interlock and secure the panels together. Although standing seam roofs provide many benefits, they generally do not provide a convenient means for enabling workers to support themselves and prevent against falling from the roof. In order to overcome this problem, various mechanisms have been employed. One known mechanism is a hook and safety line assembly that attaches at one end of the line to a safety belt worn by a worker and engages through the hook with a suitable roof edge, such as a ridge of the roof, at the other end of the line.

[0004] U. S. Patent 5,694, 720 discloses a safety clamp that attaches to standing seams of a roof deck. The safety clamp attaches to the standing roof seams by moving a threaded member to hold three standing seams in clamped relation between movable tabs of the clamp. A safety line attached to both the safety clamp and a worker's safety belt supports the worker to prevent him from falling from the roof deck.

[0005] U. S. Patent 5,758, 743 discloses a personal safety lanyard roof attachment apparatus that includes a top bar having a coupling adapted for retaining a personal safety lanyard, a pair of end supports each pivotally connected to the top bar at opposite ends thereof, a pair of crossbars interconnecting the pair of end supports, and a pair of clamping members secured to each pair of crossbars. The clamping members each comprise an adjustable clamp including a clamping handle for clamping a pair of clamping jaws, and the clamping handle includes a lock ring for locking the clamping handle in a clamped position.

[0006] U. S. Patent 5,249, 769 discloses a support which clamps to a raised profile of roof decking and supports a safety barrier or a display sign. The support comprises a clamp and a support element over which an upright support post carrying the barrier is telescopically received. The clamp comprises a pair of clamping jaws which are pivoted to each other and have respective feet at their ends remote from the pivotal connection. The feet engage the deck and have projecting flanges which cooperate with opposed undercuts on the raised profile when the clamp is tightened by a screw threaded arrangement remote from the pivotal connection. A brace is provided with a clamp similar to the above- described clamp. The brace is rotatable about the support element and the clamp can be correspondingly adjusted to be clampable to the same or different profile as the clamp.

[0007] U. S. Patent 4,334, 662 relates to a device for supporting a load on a standing seam roof. A platform is provided for spanning the distance between two adjacent roof seams and camming means are mounted on opposite sides of the platform for engaging parallel roof seams.

[0008] U. S. Patent 3,164, 353 relates to a variable pitch roof bracket that includes an elongated rod forming a base or backbone and being adapted for securement to a roof structure. A platform arm is pivotally mounted to an upper end of a base member, and a locking cam positioner is slidably movable on the base member. A rigid pivotally mounted linkage interconnecting the platform arm and cam effects a locking of the cam upon a slight downward movement of the platform arm.

[0009] While some of the above-described mechanisms may be generally good for their intended applications, most have complex structures and are heavy in weight, thereby making them unwieldy to handle and arrange securely on roof decks.

Other mechanisms may undesirably slide or shift in position under extreme conditions, such as when a heavy load is applied and/or when used on a wet or otherwise slick roof surface.

[0010] There therefore exists a need for an improved standing seam roof bracket for supporting scaffolding, and which is light-weight, easy to transport and arrange on a standing seam rook deck, adjustable for use on roofs having a wide range of pitches, and which is reliably stationary when in use, even under extreme conditions.

SUMMARY OF THE INVENTION [0011] It is an object of this invention to provide a roof bracket that can be attached to a standing seam roof, and which supports scaffolding.

[0012] It is another object of this invention to provide a scaffold-supporting roof bracket that can be easily and readily installed and removed on a roof deck.

[0013] It is another object of this invention to provide a light-weight and easily transportable roof bracket for supporting scaffolding on a roof deck.

[0014] It is a further object of this invention to provide a standing seam roof bracket for supporting scaffolding, and which is adjustable for use on roof decks having a wide range of pitches.

[0015] It is still another object of this invention to provide a standing seam roof bracket which remains substantially stationary for supporting scaffolding, even when subjected to extreme conditions such as heavy loads and slick roof surfaces.

[0016] Further objects and advantages of this invention will become apparent from a consideration of the drawings and ensuing description.

[0017] The above-described problems are overcome and the foregoing objects of the invention are realized by a roof attachment apparatus (also referred to herein as a"roof bracket") for being mounted on a building roof having at least one standing seam. In accordance with a preferred embodiment of the invention, the apparatus comprises a plurality of base plates, such as a first base plate and a second base plate, wherein the first base plate is for being disposed on a surface of the roof, and the second base plate also is for being disposed on the surface of the roof, but on an opposite side of the standing seam from where the first base plate is disposed. The apparatus also comprises a platform support member for supporting one or more scaffolding planks, and a plurality of support bars. Preferably, the support bars include a plurality of first support bars and a plurality of second support bars, each first support bar has a first end pivotally secured to the platform support member and a second end pivotally secured to the first base plate, and each second support bar has a first end pivotally secured to the platform support member and a second end pivotally secured to the second base plate. The first and second support bars have an orientation such that, when a downward force (resulting from, for example, the weight of a scaffolding plank and/or a worker) is applied to the platform support member, the force is directionally distributed through the support bars to the first and second base plates in a manner which causes the first and second base plates to displace towards one another and clamp the standing seam.

[0018] In accordance with one embodiment of the invention, the roof attachment apparatus further comprises a plurality of base plate pads, each of which covers at least a portion of an outer surface (e. g. , a lower surface and a side surface, for contacting the upper roof surface and standing seam, respectively) of a corresponding base plate. Preferably, the base plate pads each comprise rubber or some other non-abrasive material. The use of such a material tends to prevent the apparatus from sliding along the roof surface, and also prevents or at least minimizes scratching or other damage to the roof. The lower surface of each base plate pad also may be ribbed to further ensure the stationary positioning of the apparatus on the upper roof surface.

[0019] Preferably, the platform support member comprises a main frame, an elongated platform support arm pivotally secured adjacent a first end thereof to a rear portion of the main frame, and being rotatable about at least part of that rear portion, and an elongated support member having a first end secured to an intermediate portion of the platform support arm, near a second end of the platform support arm. A fastener secures a selected portion (along the length) of the elongated support member, to a front portion of the main frame opposing the rear portion, for enabling the platform support arm to be fixedly inclined at a selected angle relative to the rear portion of the main frame. This capability enables the platform support arm to be positioned in an orientation which ensures that any scaffolding planks placed thereon are positioned in an appropriate orientation for ensuring worker safety, regardless of the roof pitch.

[0020] In the preferred embodiment of the invention, the main frame comprises an upper main frame portion having a predetermined (e. g. , substantially rectangular) shape, an intermediate main frame portion, and a lower main frame portion, wherein the intermediate main frame portion is fixedly coupled to the upper and lower main frame portions and orientated so as to fixedly support at least part (e. g., a rear portion) of the upper main frame portion. Also in the preferred embodiment of the invention, at least a first one of the support bars is pivotally coupled at a first end thereof to a front portion of the upper main frame portion and at a second end thereof to a first one of the base plates, and at least a second one of said support bars is pivotally coupled at a first end thereof to the front portion of the upper main frame portion and at a second end thereof to a second one of the base plates.

Moreover, at least a third one of the support bars is pivotally coupled at a first end thereof to the lower main frame portion and at a second end thereof to the first one of the base plates, and at least a fourth one of the support bars is pivotally coupled at a first end thereof to the lower main frame portion and at a second end thereof to the second one of the base plates.

[0021] Each of the first and third support bars preferably is disposed along a respective axis that forms at least one angle relative to an upper surface of the first base plate, and each of the second and fourth support bars preferably is disposed along a respective axis that forms at least one angle relative to an upper surface of the second base plate. Moreover, the second end of each support bar preferably is located closer to a plane in which the standing seam extends than the first end of that support bar, for enabling at least part of the force distributed through that support bar and applied to the corresponding base plate, to be directed towards the standing seam.

[0022] In accordance with one embodiment of the invention, the roof attachment apparatus further comprises a plurality of elongated passive support bars coupled to at least the main frame and orientated so as to further support the main frame from the base plates, at least during times when the downward force is applied to the platform support member.

[0023] Also in accordance with one embodiment of the invention, the roof attachment apparatus further comprises at least one clamping mechanism coupled to the first and second base plates. Each clamping mechanism functions to further ensure the locking engagement of the first and second base plates to the standing seam, and, depending on which type of mechanism is employed, may or may not be adjustable to relatively displace the first and second base plates towards and away from each other. In one embodiment of this invention, the clamping mechanism comprises, for example, tube portions secured to the respective base plates, an elongated shaft or rod-like member which can be received in channels of the tube portions, and a washer and clip assembly for substantially securing the position of the shaft in the tube portions and thereby further ensuring the locking engagement of the base plates to the standing roof seam. In another embodiment of the invention, the shaft and tube portions are threaded for enabling the shaft's position, and hence the relative positions of the base plates, to be adjusted automatically.

[0024] Also, in accordance with one embodiment of the invention, each base plate extends in a plane that forms an angle relative to a plane in which the upper main frame portion extends, to enable the apparatus to be employed on a pitched roof, although, as described above, the adjustability of the platform support arm also enables scaffolding planks to be adequately and safely supported, regardless of the roof pitch.

[0025] Preferably, at least some of the components of the roof attachment apparatus include a light-weight material, such as, for example, aluminum, so that the overall apparatus is light-weight, and thus easy to transport and arrange on a building roof deck. The use of aluminum or another non-ferrous material is advantageous in that such materials do not rust or cause associated rust stains on roof decks.

[0026] According to another embodiment of the invention, a plurality of brake members (auxiliary brakes) are pivotally coupled to corresponding ones of the base plates. In this embodiment, when the force is applied to the platform support member and distributed through the support bars in the above-described manner, the force is transferred to the base plates and brake members for causing the base plates and brake members to displace towards the standing seam. At least the base plates engage the standing seam, although the brake members may as well if a greater, sufficient force is applied to the platform support member. Each brake member preferably has a curved side surface which contacts the standing seam, and that surface is serrated. For example, the surface may form a saw-toothed shape.

[0027] The brake members function as a back-up mechanism to even further ensure the stationary positioning of the roof attachment apparatus on the roof. For example, if at least a predetermined downward force is applied to the bracket, a portion of the force that is distributed to the brakes members causes them to rotate (while in contact with standing seam) in a counter-clockwise direction about their respective pivots until the brakes'teeth engage firmly with the standing seam. As a result, any unlikely tendency of the bracket to slide appreciably along the surface of the roof is prevented or at least substantially reduced, even when a substantial load is being supported by the bracket, and even when the bracket is being used on a wet or otherwise slick roof surface.

[0028] In accordance with another embodiment of this invention, each base plate and base plate pad has a serrated surface, and the serrated surface of each base plate is engaged with the serrated surface of a corresponding one of the base plate pads. For example, each serrated surface may form a saw-toothed or other suitable notched or teethed shape. In this embodiment, each base plate pad has an upper surface and a lip portion extending from part of the upper surface, each base plate is arranged on the upper surface of a corresponding one of the base plate pads, and the lip portion of each base plate pad has the serrated surface engaged with the serrated surface of the base plate arranged thereon.

[0029] The foregoing configuration of the base plates and base plate pads enables the plates to firmly engage with the corresponding pads, and substantially prevents any possible displacement of the plates relative to the corresponding pads, even when a substantial downward force is applied to the overall roof attachment apparatus. The base plates and base plate pads are thereby maintained in secured engagement to further ensure the stability of the overall apparatus on the roof deck.

[0030] The above set forth and other features of the invention are made more apparent in the ensuing Detailed Description of the Preferred Embodiments when read in conjunction with the attached drawings, wherein: [0031] Fig. 1 shows a standing seam roof bracket constructed in accordance with this invention, as viewed from a perspective looking towards a side thereof, wherein the standing seam roof bracket is shown disposed on a standing seam roof 20.

[0032] Fig. 2 shows the standing seam roof bracket of Fig. 1, as viewed from a perspective looking towards a rear of the bracket.

[0033] Fig. 3 shows the standing seam roof bracket of Fig. 1, as viewed from a perspective looking down on a work platform 9 of the bracket.

[0034] Fig. 4 shows the standing seam roof bracket of Fig. 1 disposed on the roof 20 of that figure, as viewed from a perspective looking towards a side opposite to that shown in Fig. 1.

[0035] Fig. 5 shows the standing seam roof bracket of Fig. 1, with all components of the bracket removed except for a platform support member and a portion of a lower frame portion 6e, as viewed from a perspective looking down on the bracket.

[0036] Fig. 6 shows the standing seam roof bracket of Fig. 1, with all components removed except for those shown in Fig. 6, as viewed from a perspective looking towards a front of the bracket.

[0037] Figs. 7 and 8 are perspective views of the standing seam roof bracket of Fig. 1.

[0038] Fig. 9 shows the manner in which a plurality of standing seam roof brackets according to this invention are employed to support scaffolding and a worker on a standing seam roof deck.

[0039] Fig. 10 is a perspective view of a front adjustment rod and pivot assembly 8, a work platform 9, and upper main frame portions 6a, 6b, and 6d of the standing seam roof bracket of Fig. 1.

[0040] Fig. 11 shows a standing seam roof bracket constructed in accordance with another embodiment of this invention, as viewed from a perspective looking towards a side thereof, wherein the standing seam roof bracket is shown disposed on standing seam roof 20, and includes a brake mechanism and serrated base plates 102a, 102b and base plate pads 101a, 101b.

[0041] Fig. 12 shows the standing seam roof bracket of Fig. 11, as viewed from a perspective looking towards a rear of the bracket.

[0042] Fig. 13 shows the standing seam roof bracket of Fig. 11, as viewed from a perspective looking down on a work platform 9 of the bracket.

[0043] Figs. 14 and 15 are perspective views of the standing seam roof bracket of Fig. 11.

[0044] Fig. 16 shows base plate pads 10 la and 101b and auxiliary brakes 32a and 32b of the standing seam roof bracket of Fig. 11, as viewed from a perspective looking up towards those elements from underneath the bracket.

[0045] Fig. 17 is a perspective view of base plate 102b and base plate pad 10 lb of the standing seam roof bracket of Fig. 11.

[0046] Fig. 18 represents the manner in which auxiliary brakes 32a and 32b engage with a standing seam 22 of a standing seam roof.

[0047] Identical portions of the various figures have been identified with the same reference numerals in order to simplify the description of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0048] Referring to Figs. 1-8, an example of a standing seam roof bracket 11 constructed in accordance with a preferred embodiment of this invention will now be described. The illustrated roof bracket 11 comprises a platform support member that includes a main frame 6, a work platform 9, a rear pivot assembly 10, and a front adjustment rod and pivot assembly 8 (Fig. 5), and also comprises a plurality of front active support bars 5a and 5b, a plurality of rear active support bars 4a and 4b, base plates 2a and 2b, a rod and lock assembly 3, at least one latch/lock mechanism 24, support gussets 2c-2f, and base plate pads la and lb. In a preferred embodiment of the invention, at least some, and preferably all (except for, e. g., pads la, lb and mechanism 24), of those components of the bracket 11 comprise aluminum so that the overall bracket 11 is light-weight, although in other embodiments, any other suitable materials may be employed instead. For example, any suitable non-ferrous materials also may be employed so that the bracket 11 is not susceptible to rusting and causing undesired rust stains on a building roof deck 20 when arranged thereon.

[0049] The main frame 6 preferably comprises an upper main frame portion that includes a plurality of upper main frame portions 6a-6d, a lower main frame portion that includes at least one lower frame portion 6e, and an intermediate main frame portion that includes a plurality of intermediate frame portions 6f-6i, each of which portions 6a-6i includes, for example, an elongated aluminum angle <BR> <BR> (illustrated) (e. g. , a 1"xl"angle), bar, or tubing, although in another embodiment<BR> bars having other suitable dimensions (e. g. , a 1. 5"xl. 5"angle) may be employed instead for all or only certain ones of those portions 6a-6i, such as, for example, portions 6b and 6d. Preferably, the lower frame portion 6e is longer than upper frame portion 6b, although respective outer facing surfaces of those frame portions 6e and 6b preferably lie in substantially a same plane. A first end of frame portion 6a is welded or otherwise affixed to a first end of frame portion 6d, a first end of frame portion 6c is welded or otherwise affixed to a second end of frame portion 6d, a second end of frame portion 6a is welded or otherwise affixed to a first end of frame portion 6b, and a second end of frame portion 6c is welded or otherwise affixed to a second end of frame portion 6b. The upper main frame portions 6a-6d collectively form a substantially rectangular shape, although in the illustrated embodiment, frame portions 6a and 6c each extend somewhat beyond a plane in which frame portion 6b extends, and both lie in a plane that is above that in which frame portions 6b and 6d extend. It should be understood, however, that the invention is not limited to an upper main frame portion having only the above- described construction. For example, in other embodiments of the invention, the upper main frame portions 6a-6d may form any other shape (besides substantially rectangular) which is suitable for use in supporting a scaffolding plank in conjunction with a work platform 9.

[0050] Referring now to the intermediate frame portion 6i, a first, outer surface of that portion 6i, at an upper end thereof, is affixed at 40 (Fig. 8) to an inner surface of frame portion 6c, at the second end of the frame portion 6c, and a second surface of the frame portion 6i (adjacent the upper end thereof) facing the outer surface of frame portion 6b preferably is welded or otherwise affixed to that outer surface of frame portion 6b, adjacent a first end of that frame portion 6b. The first, outer surface of the intermediate frame portion 6i, adjacent a lower end thereof, preferably also is affixed at 41 to an inner surface of frame portion 6g, adjacent a first, lower end of the frame portion 6g. Moreover, a portion of the second surface of frame portion 6i (adjacent the lower end thereof) facing an outer surface of lower frame portion 6e (adjacent a first end of frame portion 6e), preferably is welded or otherwise affixed to that outer surface of lower frame portion 6e.

[0051] Similarly, a first, outer surface of intermediate frame portion 6h, at an upper end thereof, is affixed at 42 to an inner surface of frame portion 6a, at the second end of frame portion 6a, and a second surface of the frame portion 6h (adjacent the upper end thereof) facing the outer surface of frame portion 6b (adjacent a second end of that frame portion 6b) preferably is welded or otherwise affixed to that outer surface of frame portion 6b. Also, the first, outer surface of the intermediate frame portion 6h, at a lower end thereof, is affixed at 43 to an inner surface of frame portion 6f, adjacent a first, lower end of the frame portion 6f, and a portion of the second surface of the frame portion 6h facing the outer surface of lower frame portion 6e (adjacent a second end of frame portion 6e), preferably is welded or otherwise affixed to that outer surface of frame portion 6e.

[0052] Referring now to the front passive support bars 6k and 6j, in the illustrated embodiment, an outer surface of the support bar 6k, adjacent a first, upper end of the bar 6k, is affixed at 44 to the inner surface of the frame portion 6a, at an intermediate portion of the frame portion 6a between the two ends thereof. A second, lower end of the bar 6k is disposed adjacent to an upper surface of the base plate 2a, but preferably is not fixedly secured to that base plate 2a, although in other embodiments, the second, lower end of bar 6k may be fixedly secured to the base plate 2a. Similarly, an outer surface of the support bar 6j, adjacent a first, upper end of the bar 6j, is affixed at 45 to the inner surface of the frame portion 6c, at an intermediate portion of the frame portion 6c between the two ends thereof. A second, lower end of the bar 6j is disposed adjacent to an upper surface of the base plate 2b, but preferably is not fixedly secured to that base plate 2a, although in other embodiments, the second, lower end of bar 6j may be fixedly secured to the base plate 2b. Also, the inner surface of the intermediate frame portion 6f, adjacent a second, upper end thereof, is affixed at 46 to an outer surface of front passive support bar 6k, and the inner surface of the intermediate frame portion 6g, adjacent a second, upper end thereof, is affixed at 47 (Fig. 1) to an outer surface of front passive support bar 6j. Preferably, the front passive support bars 6k and 6j extend substantially perpendicularly relative to corresponding upper surfaces of the base plates 2a and 2b, respectively, although there preferably is a predetermined spatial distance (e. g. , 1/8") separating the second, lower end of each bar 6k and 6j and the corresponding base plate 2a and 2b. Also, the support bar 6k and intermediate frame portion 6f preferably are oriented so as to collectively form substantially a right angle, the support bar 6j and intermediate frame portion 6g preferably also are oriented so as to collectively form substantially a right angle, and the frame portions 6f and 6g preferably extend in a plane that is substantially parallel to an upper surface of base plates 2a and 2b, respectively. Moreover, the passive support bars 6k and 6j preferably are orientated relative to the main frame 6 so that support bar 6k and frame portion 6a collectively form a predetermined angle of, for example, approximately 45 degrees, and the support bar 6j and frame portion 6c preferably also are orientated so as to collectively form substantially that same angle. The intermediate frame portions 6f, 6g, 6h, 6i, lower frame portion 6e, and support bars 6j and 6k function to cause a force applied thereto, and originated from a downward force applied to the work platform 9 (e. g. , a force resulting from the weight of a scaffolding plank and/or a worker), to be evenly distributed to the support bars 4a and 4b (in addition to the force distributed to bars Sa and 5b) and base plates 2a and 2b, as will be described in further detail below. The passive support bars 6j and 6k also function to further stabilize the upper main frame portion when a downward force is applied thereto. For example, in the event that a greater force is applied to one side of the upper main frame portion than to an opposite side thereof (e. g. , disposed on an opposite side of the arm 9), the bar 6j or 6k disposed underneath the side subjected to the greater force stabilizes the upper main frame portion by displacing towards and coming into stabilized contact with the respective base plate 2b or 2a, as a result of the force applied to the bar 6j or 6k, and also causes at least a portion of the greater force to be distributed towards the opposite side of the device 11, for preventing or at least substantially reducing any tendency of the device 11 to tilt.

[0053] In the example being described, each base plate 2a and 2b preferably has dimensions of approximately 3/8" (height thickness) X 8" (width) X 18" (length), and includes aluminum, although in other embodiments, other dimensions and materials may be employed instead. Also, in the preferred embodiment of the invention, each base plate 2a and 2b has angled corners 27. That configuration reduces the overall area occupied by the base plates 2a and 2b, and enables the bracket 11 to be conveniently situated adjacent to sharp corners formed by structures on building roof decks.

[0054] The base plate pad 1 a is attached at an upper surface thereof to a lower surface of the base plate 2a, and the base plate pad lb is attached at an upper surface thereof to a lower surface of the base plate 2b. At least a portion of each base plate pad la and lb (covering the lower surface of the respective plates 2a and 2b) preferably has a shape and dimensions that are substantially the same as those of the respective plates 2a and 2b, although the pads 1 a and lb preferably also include ridge portions la'and lb', respectively, which are affixed to and cover inner side surfaces 2a'and 2b', respectively, of the corresponding plates 2a and 2b (Fig. 7). The pads la and lb may be attached to the corresponding plates 2a and 2b by, for example, a contact cement (e. g. , splice cement) or some other suitable securing mechanism. Preferably, each pad la and lb comprises a material such as EPDM rubber or some other suitable material that (a) has a high coefficient of friction making it suitable for tending to prevent the overall 11 bracket from sliding significantly on the surface of a roof (such as roof 20), and (b) is non-abrasive, in order to prevent the bracket 11 from scratching or otherwise physically damaging the roof 20 when arranged thereon. In one embodiment of the invention, a lower surface of each base plate pad la and lb also is ribbed to even further ensure the stable positioning of the bracket 11 on roof 20, although for convenience this is not represented in the drawings.

[0055] In the example being described, the support gussets 2c-2f are each angled or curved rectangular plates, and are formed by two 2"x2"plates that are welded or otherwise affixed together to collectively form a curved or angled plate, although in other embodiments, the support gussets may have other shapes and dimensions and may be formed by a single integral, angled plate. A lower surface of a first portion of each of the support gusset 2c and 2d preferably is welded or otherwise affixed to an upper surface of the base plate 2a, and each gusset 2c and 2d preferably is shaped so that its upper, angled (second) portion extends from its lower, non-angled (first) portion at a predetermined angle 6 relative to the base plate 2a. Similarly, a lower surface of each support gusset 2e and 2f preferably is welded or otherwise affixed to an upper surface of base plate 2b, and each support gusset 2e and 2f preferably is shaped so that its upper, angled (second) portion extends from its lower, non-angled (first) portion at a predetermined angle 0 relative to the base plate 2b (see Fig. 1). For example, the angle 0 may be 45 degrees or any other suitable angle, depending on the applicable roof pitch (e. g. , an angle 0 of 45 degrees is well-suited for roofs having a pitch as steep as approximately a 45 degree slope). In the illustrated embodiment, the support gussets 2c-2f are shown as being affixed to the corresponding base plate 2a or 2b through a nut and bolt assembly, although it should be noted that any other suitable type of securing mechanism may be employed instead.

[0056] Referring to Figs. 6-8, the front active support bars 5a and 5b attach the main frame 6 to the base plates 2a and 2b, respectively, through the respective gussets 2d and 2f, and the rear active support bars 4a and 4b attach the main frame 6 to the base plates 2a and 2b, through the gussets 2c and 2e, respectively. More particularly, an upper end of front active support bar 5a is pivoted at 12 to an inner facing surface of frame portion 6d, adjacent the first end of the frame portion 6d, and a lower end of the front active support bar 5a is pivoted at 13 to an inner facing surface of support gusset 2d (Fig. 7). Similarly, an upper end of front active support bar 5b is pivoted at 14 to an inner facing surface of the frame portion 6d, adjacent the second, opposite end of the frame portion 6d, and a lower end of front active support bar 5b is pivoted at 15 to an inner facing surface of support gusset 2f (Fig. 7). Moreover, an upper end of rear active support bar 4a, which, in the illustrated embodiment, is longer than the front active support bar 5a, is pivoted at 16 to the outer surface of lower frame portion 6e, adjacent the second end of that lower frame portion 6e, and a lower end of support bar 4a is pivoted at 17 to support gusset 2c. Similarly, an upper end of rear active support bar 4b is pivoted at 18 to the outer surface of lower frame portion 6e, adjacent the first end of that lower frame portion 6e, and a lower end of the support bar 4b is pivoted at 19 to support gusset 2e. The pivots 12-19 preferably are provided by a nut and bolt (e. g., screw) assembly, although in other embodiments, other suitable securing and pivoting mechanisms may be employed instead. Preferably, during times when no downward force is being applied to the work platform 9, the support bars 4a and 4b are orientated so that a plane in which a lower surface of each bar 4a and 4b extends forms an angle 01 (in a plane normal to that lower surface) relative to an upper surface of the corresponding base plate 2a or 2b, respectively (Figs. 2,7, and 8), and so that a plane in which a side surface of each bar 4a and 4b extends forms an angle 61' (in a plane normal to that side surface) relative to an upper surface of the corresponding base plate 2a or 2b, respectively (Figs. 1 and 4). Also during times when no downward force is being applied to the work platform 9, the support bars 5a and 5b preferably are orientated so that a plane in which a lower surface of each bar 5a and 5b extends forms an angle 02 (in a plane normal to that lower surface) relative to an upper surface of the corresponding base plate 2a or 2b, respectively (Figs. 6 and 7), and so that a plane in which a side surface of each bar 5a and 5b extends forms an angle 02' (in a plane normal to that side surface) relative to an upper surface of the corresponding base plate 2a or 2b, respectively (Figs. 1,4, and 6). For example, the angles 61 and 02 each may be 30 degrees, and the angles 61'and 62'each may be 45 degrees, although in other embodiments, other suitable angles may be employed instead, depending on applicable operating criteria.

[0057] The work platform 9 (also referred to herein as a"platform support arm") preferably has a square or rectangular cross section, and has an upper surface 9a that is employed for supporting one or more scaffolding planks 21 (see, e. g., Fig. 9) for supporting a worker 23. The work platform 9 may be, for example, tubular, although in other embodiments the platform 9 may have a solid cross section. As can be seen in Fig. 1, the work platform 9 preferably has a first end surface 9b that is disposed at a predetermined angle relative to a lower surface 9c of the platform 9, so that the platform 9 can extend to or substantially close to a pitched standing seam roof, such as the roof 20. In a preferred embodiment of the invention, a lip portion 9a'comprised of aluminum or some other suitable material is welded or otherwise secured to the upper surface 9a of the work platform 9, adjacent to a second end of the platform 9 opposing the first end surface 9b (see, e. g., Fig. 1), although in other embodiments, the lip portion 9a'may be an integral part of the overall work platform 9. The lip portion 9a'preferably extends from the upper surface 9a by a distance that is long enough for preventing a scaffolding plank (not shown in Fig. 1) supported on the surface 9a from sliding off the platform 9, and, in a preferred embodiment, has an angled end 9a"to reduce the possibility that items besides scaffolding planks will undesirably become engaged by the lip portion 9a'. Also, although not shown in the drawings, the lip portion 9a'may also include an aperture through at least one surface thereof, for receiving at least one nail, screw or other suitable securing mechanism therein, to enable the securing <BR> <BR> mechanism to further secure the scaffolding plank (s) 21 to the platform 9 (e. g. , for enabling a nail to be driven into the plank (s) 21).

[0058] The rear pivot assembly 10 will now be described. The assembly 10 includes a channel-shaped arm support member (e. g. , a"C"channel) that comprises a base l Oc (Fig. 2) from which extends two opposing ears 1 Oa and 1 Ob (see also Fig. 5) having aligned apertures therethrough and being positionable on opposite sides of the work platform 9. A lower surface of the base l Oc is welded or otherwise affixed to the upper facing surface of frame portion 6b, and preferably is centered substantially midway between the two opposing ends of the frame portion 6b. The apertures of the ears lOa and lOb are aligned with apertures (not shown) provided through opposing walls of the platform 9 for the reception of, for example, a screw, bolt, or pin 25 therethrough, to enable the element 25 to pivotally secure the platform 9 to the ears 10 and 1 Ob of the arm support member.

In this manner, the platform 9 can be rotated about the element 25 so as to be <BR> <BR> placed in a desired inclination relative to the main frame 6 (e. g. , frame portion 6b), as will be described further below.

[0059] The front adjustment rod and pivot assembly 8 will now be described.

Referring to Fig. 6, the assembly 8 includes a channel-shaped arm support member <BR> <BR> (e. g. , a"C"channel) that comprises a base 8c from which extends two opposing ears 8a and 8b having aligned apertures (not shown) therethrough and being positionable on opposite sides of the work platform 9, and an elongated rod 8d which extends downward from a lower surface of the base 8c. The apertures of the ears 8a and 8b are aligned with apertures (not shown) provided through opposing walls of the platform 9 for the reception of a screw, bolt, or pin 15' (Fig. 5) therethrough, to enable the bolt 15'to secure the platform 9 to the ears 8a and 8b of the arm support member. The rod 8d includes, for example, aluminum tubing, and preferably has opposing walls that are provided with plural sets of aligned apertures or holes 8e (Figs. 4 and 10) therethrough, although in other embodiments, the rod 8d may have a solid cross section with plural through-holes provided therein, and may include other materials besides aluminum.

[0060] The assembly 8 also comprises a rear adjustment sleeve 7 (e. g. , a"C" channel) that includes a base portion 7c (Fig. 6) which is welded or otherwise affixed to an inner facing surface of the frame portion 6d of main frame 6, and which preferably is disposed so that the overall sleeve 7 is substantially centered on that inner facing surface of frame portion 6d, as can be appreciated in view of Fig.

10. The sleeve 7 also comprises two opposing walls 7a and 7b (Fig. 10) extending from opposite ends of the base portion 7c, and which have aligned apertures therethrough and are positionable on opposite sides of the rod 8d. The components 7a-7c of the rear adjustment sleeve 7 preferably at least partially surround an internal channel area that is large enough to receive a cross section of the rod 8d.

[0061] The rod 8d preferably has a square cross section of a size that is suitable for enabling that cross section to be received within the internal channel area between the components 7a-7c of the sleeve 7. When the rod 8d is received within that area, and opposing holes 8e of the rod 8d are aligned with the opposing holes in the walls 7a and 7b of the sleeve 7, a bolt or pin 14'can be inserted through those holes to secure the rod 8d in the sleeve 7. Moreover, a clip pin 14"preferably is inserted in a through-hole in the pin 14', to prevent the pin 14'from backing out of the holes in the sleeve 7 and rod 8d.

[0062] As can be appreciated by one skilled in the art in view of this description, the plural sets of apertures 8e in the rod 8d enable the orientation of the work platform 9 to be adjusted so as to be placed at a desired inclination relative to the main frame 6, and thereby enable the platform 9 to be properly positioned for supporting scaffolding planks on roof decks having a wide range of pitches. It should be recognized that the adjustability of the platform 9 is not limited to any predetermined angles or series of angles, but rather can be adjusted at any conceivable angle between the extremes thereof. This capability ensures the appropriate positioning of scaffolding planks, regardless of the roof pitch, and thereby ensures worker safety.

[0063] The manner in which the bracket 11 operates in response to a downward force being applied to the upper surface 9a of the work platform 9 will now be described. When a downward force is applied to the work platform 9 (resulting from, for example, the weight of scaffolding plank (s) and/or a worker), the force is distributed through the platform 9 and components 8 and 10 to the upper portion of the main frame 6, which thereafter distributes the applied forces substantially evenly through the active support bars 5a and 5b, and through the passive support bars 6k and 6j, and also substantially evenly through intermediate frame portions 6f and 6g and intermediate frame portions 6h and 6i, to the lower frame portion 6e, and then evenly from there to support bars 4a and 4b. The support bars 4a and 5a then each transmit the force applied thereto through the bar to the base plate 2a through the support gussets 2c and 2d, respectively, and the support bars 4b and 5b each transmit the force applied thereto through the bar to the base plate 2b, through the support gussets 2e and 2f, respectively. Owing to the orientation of each support bar 4a and 5a relative to the base plate 2a, and the orientation of each support bar 4b and 5b relative to the base plate 2b, the forces are applied to the base plate 2a and 2b in a direction which causes those plates to exert a downward force on the roof 20 (through the base plate pads la and lb), and to cause the base plates 2a and 2b to relatively displace towards one another and the standing seam 22. As a result, the ridge portions la'and lb'of the pads la and lb, respectively, are drawn towards each other and crimp or clamp the standing seam 22, thereby lockingly engaging the overall bracket 11 to the seam 22 and substantially preventing or at least substantially reducing any tendency of the bracket 11 to slide along the surface of the roof 20. It can therefore be appreciated that any increase in the superimposed load or any vibration such as might occur when a worker 23 walks on planks 21 supported by the work platform 9 will only tend to tighten that locking engagement.

[0064] Fig. 9 shows the manner in which a plurality of the standing seam roof brackets 11 according to this invention support one or more scaffolding planks 21 and a worker 23 on the standing seam roof 20. Although two brackets 11 are shown in Fig. 9, it should be noted that more or less than that number of brackets 11 may be employed to support one or more scaffolding planks and/or workers, depending on, for example, the particular application and roof configuration of interest.

[0065] The rod and lock assembly 3 will now be described. In a preferred embodiment of the invention, the rod and lock assembly 3 is provided to even further ensure and tighten the locking engagement of the bracket 11 to the roof seam 22. Referring to Figs. 2,3, 7, and 8, the assembly 3 preferably comprises an elongated shaft or rod-like member 3a, tube portions 3b and 3c which each have a hollow internal channel therethrough, support plates 3e and 3f, which, in the illustrated embodiment, are angled plates (e. g. , 90 degrees), and a clip pin and washer assembly 19'. The support plates 3e and 3f are attached to the upper surface of the respective base plates 2b and 2a through a nut and bolt assembly, welding, or some other suitable attachment mechanism, the tube portions 3c and 3b are welded or otherwise attached to an upper surface of an upper facing portion of the support plates 3e and 3f, respectively, and the hollow channel through the tube portion 3b is aligned with that of tube portion 3c. Preferably, the support plates 3e and 3f each have a same height that is larger than that of the standing seam 22.

[0066] The tube portions 3b and 3c and rod-like member 3a preferably have similar cross-sections that may be, for example, circular, rectangular, or another suitable shape, although the tube portions 3b and 3c are slightly wider in cross- section than the rod-like member 3a so that the rod-like member 3a can be received in the channels of those tube portions 3b and 3c. The clip pin and washer assembly 19'secures the rod-like member 3 a in place at opposite ends of the member 3a, wherein in the illustrated embodiment, through-holes are provided at those ends for receiving an arm of a clip pin of assembly 19'therein, for securing the position of the member 3a between washers of the assembly 19'.

[0067] In accordance with one embodiment of this invention, another mechanism may be provided, either in addition to, or in lieu of the assembly 3, to even further ensure and tighten the locking engagement of the bracket 11 to the roof seam 22.

For example, a latch lock mechanism 24 (Figs. 3,4, and 8) such as a stainless steel latch clamp available from Grainger, Carrlane item Model No. CL-250-PA-S, may be employed, and may be secured to the base plates 2a and 2b as shown. When a handle 24c of the mechanism 24 is in a downward or closed position, a hook member 24b, which is attached at one end to the handle 24c and hooked at another end to a gusset 24a (e. g. , an angled aluminum bar) through a hole in gusset 24a, pull the gusset 24a towards the hook member 24b. As a result, since the gusset 24a and handle 24c are secured to the base plates 2a and 2b, respectively, the base plates 2a and 2b and base plate pads la and lb are drawn towards one another to further clamp the seam 22. In this manner, the assembly can be used to lockingly engage the bracket 11 with the seam 22, if not engaged already, or to further tighten the locking engagement of the bracket 11 to the standing seam 22, if engaged already. This capability further ensures that the bracket 11 does not become disengaged with the seam 22, especially in the event that a downward force applied to the work platform 9 is removed. As shown in the illustrated embodiment, the hook member 24b preferably includes a threaded portion that is engaged with threads provided in the handle 24c, to enable the position of the hook member 24b and the relative displacement of the base plate 2a and 2b and base plate pads la and lb to be adjusted.

[0068] In another embodiment of the invention, a threaded shaft (not shown) is employed instead of the rod-like member 3a, and inner surface areas of the tube portions 3b and 3c also are threaded, for enabling the shaft to be adjusted for causing the relative displacement of the base plates 2a and 2b and base plate pads la and lb. In accordance with further embodiment of this invention, the assembly 3 may be implemented with a cam mechanism (not shown) disposed at a first end of rod-like member 3a and a nut and washer assembly disposed at the second end of the rod-like member 3a. For example, the cam may be pivoted at the first end of the rod-like member 3a, and when pivoted to a position where a projecting or lobe portion of the cam tightly engages with the tube portion 3b, the tube portions 3b and 3c are caused to be drawn towards one another by the rod-like member 3a and nut and washer assembly. As a result, the base plates 2a and 2b and pads la and lb also are drawn towards one another to clamp the seam 22 (if not already clamped).

Although the cam is not represented in the drawings, one skilled in the art would clearly appreciate in view of this description the manner in which the cam would be pivoted to the rod-like member 3a and operated to ensure the locking engagement of the bracket 11 to the standing seam 22.

[0069] It should be noted that, although this description is described in the context of the bracket 11 comprising, among other things, either a rod-like member 3a, threaded shaft, or cam mechanism, and/or a latch lock mechanism 24, it also is within the scope of this invention to employ any other suitable type of assembly, in addition to, or in lieu of, those components, to further enable the bracket 11 to be lockingly engaged to the roof seam 22. Alternatively, only one of the assembly 3 or mechanism 24 may be employed, or, in other embodiments, no such assembly 3 or mechanism need be employed at all. In this case, the bracket 11 secures to the roof seam 22 simply by means of the downward force applied to the work platform 9, in the above-described manner. It should therefore be appreciated in view of this description that the assembly 3 and mechanism 24 function to even further ensure and tighten the locking engagement of the bracket 11 to the roof seam 22, when the bracket 11 is already clamped to the roof seam 22 as a result of a downward force applied to the work platform 9, or to provide such an engagement when no such downward force is being applied to the work platform 9.

[0070] It also is within the scope of this invention to provide other configurations of the bracket 11 besides the configuration described herein and shown in the drawings, so long as the bracket enables a downward applied force to be directionally distributed in a manner which enables the base plates 2a and 2b and base plate pads la and lb to be drawn together for clamping the standing seam 22 of a roof 20. For example, in another embodiment of this invention, the bracket 11 may be comprised of a main frame that includes only upper main frame portions 6a-6d, and the support bars 4a, 5a, and 4b, 5b in that embodiment are pivotally attached to the main frame and corresponding base plates 2a and 2b (i. e. , no intermediate frame portions 6f, 6g, 6h, and 6i, lower frame portion 6e, and/or passive support bars 6j and 6k, need be employed), although this specific configuration is not explicitly shown in the drawings. In this embodiment, the support bars 4a, 4b, 5a, and 5b preferably also have an orientation which enables a downward applied force to the main frame to be directionally distributed to the base plates 2a and 2b in a manner which causes the bracket 11 to clamp the roof seam 22, in a similar manner as described above.

[0071] In still another embodiment of the invention, the supports bars 4a, 4b, 5a, and 5b need not be orientated in a manner which enables a downward applied force to be distributed so as to cause the base plates 2a and 2b (and pads la and lb) to clamp the standing seam 22, and the clamping of the bracket 11 to the seam 20 may be provided instead by the assembly 3 and/or latch lock mechanism 24.

[0072] Also, in other embodiments the work platform 9 need not be adjustable, and may be non-pivotally attached to main frame 6 so as to be arranged in a permanent orientation. In still a further embodiment (not shown) of the invention, the bracket 11 may have a configuration in which the work platform 9 is pivotally secured at one end to, and rotatable at least partially around, the front portion (e. g., frame portion 6d) of the main frame 6, and the adjustment rod and pivot assembly 8 may be provided at the rear portion (e. g. , frame portion 6b) of the main frame 6<BR> (i. e. , in this embodiment, the portion of the work platform 9 adjacent the frame portion 6b is secured to the rod 8d of assembly 8). As for the above-described embodiment, the present configuration also enables the inclination of the work platform 9 to be adjusted as desired, but in this case relative to the front portion of the main frame 6, and also enables the platform 9 to be positioned appropriately for supporting scaffolding planks on roof decks having a wide range of pitches.

[0073] Moreover, while the invention has been described in the context of the bracket 11 having a configuration making it suitable for use with standing seams that extend from an upper roof ridge to a lower roof edge, broadly construed, the invention is not so limited. For example, it also is within the scope of this invention for the bracket 11 to have a configuration that is suitable for securing to standing seams that extend along roofs in a parallel relationship to the upper roof ridge, or along some other direction, depending on the type of standing seam roof employed.

[0074] Furthermore, although the invention is described in the context of certain components of the bracket 11 being welded together, it should be noted that any other suitable types of securing mechanisms may be employed instead or in lieu thereof. For example, preferably such components are secured together through a rivet and a welding.

[0075] A further embodiment of the present invention will now be described, with reference to Figs. 11-17, which show a roof bracket 11'according to this embodiment. The roof bracket 11'preferably comprises the same components as the roof bracket 11 described above, except for a difference in the configuration of the base plates and base plate pads and an addition of an auxiliary brake configuration. In the present embodiment, base plates 102a and 102b are provided which preferably have dimensions of approximately 1/4" (height thickness) X 8" (width) X 22" (length), and include aluminum, although other dimensions and materials may be employed instead. Each base plate 102a and 102b has an inner facing serrated edge 2al'and 2bl', respectively, and angled inner facing edges 36a and 36b defining cutouts (Figs. 16 and 17) in those respective plates, of a size suitable for at least partially surrounding a perimeter of a corresponding auxiliary brake 32a or 32b, respectively. Preferably, the serrated edges 2al'and 2bl'each form a saw-toothed shape, although in other embodiments the edges 2al'and 2bl' may form any other suitable type of toothed or notched shape. The foregoing configuration of the base plates 102a and 102b enables them to interlock with base plate pads lOla and lOlb, respectively, that are constructed in accordance with this embodiment, and to structurally support the auxiliary brakes 32a and 32b, respectively, as will be described in further detail below.

[0076] Base plate pad 101 a is attached at an upper surface thereof to a lower surface of the base plate 102a, and the base plate pad lOlb is attached at an upper surface thereof to a lower surface of the base plate 102b. At least a portion of each base plate pad 10 la and 10 1 b (covering the lower surface of the respective plates 102a and 102b) preferably has a shape and dimensions that are substantially the same as those of the respective plates 102a and 102b (including the angled cutout), although the pads 10 la and lOlb preferably also include ridge or lip portions la' and lb', respectively, extending upwardly from an upper surface of the respective pads lOla and lOlb, along a length of the upper surface, adjacent an edge thereof, as shown in Fig. 17. In accordance with an aspect of this invention, outer facing edges 103a and 103b of base plate pads lOla and lOlb, respectively, are each serrated for engaging with and covering the serrated inner facing edges 2al'and 2bl', respectively, of the corresponding plates 102a and 102b (Fig. 14).

Preferably, the serrated edges 103a and 103b each form a saw-toothed shape and mirror (i. e. , are staggered with) the corresponding edges 2al'and 2bl', respectively, of the corresponding base plate 102a and 102b, to enable the base plate pads lOlb and lOlb to interlock with those base plates 102a and 102b, respectively. In other embodiments the edges 103a and 103b may form any other toothed or notched shape which is suitable for physically interlocking with the corresponding base plates 102a and 102b.

[0077] An example of the manner in which the base plates and base plate pads engage with one another is represented in Fig. 17, although for convenience, only base plate 102b and base plate pad lOlb are shown. As can be appreciated in view of Fig. 17, the edges 103b and 2bl'are staggered such that, when they are brought together, forward pointing teeth of the edge 2bl'are inserted into opposite notches of the edge 103b, and vice versa. As a result, the plate 102b and base plate pad lOlb become firmly engaged with one another.

[0078] The above configurations of the base plates 102a and 102b and base plate pads 10 la and lOlb enable the plates 102a and 102b to firmly engage with the pads 101a and lOlb, respectively, in the above-described manner. This substantially prevents or at least minimizes any possible displacement of the plates 102a and 102b relative to the pads lOla and lOlb, respectively, even when a substantial downward force (e. g. , over 300 lbs.) is applied to the bracket 11'.

[0079] The pads 10 la and lOlb may be further fixedly secured to the <BR> <BR> corresponding plates 102a and 102b by, for example, a contact cement (e. g. , splice cement) or some other suitable securing mechanism. Preferably, each pad 101 a and lOlb comprises a material such as EPDM rubber or some other suitable material that (a) has a high coefficient of friction making it suitable for tending to substantially prevent the overall 11'bracket from sliding on the surface of a roof (such as roof 20), and (b) is non-abrasive, in order to substantially prevent or minimize scratching or other physical damage to the roof 20 when the bracket 11' is arranged thereon. As for the bracket 11 described above, a lower surface of each base plate pad lOla and lOlb preferably is ribbed to even further ensure the stable positioning of the bracket 11'on roof 20, although for convenience this is not represented in the drawings.

[0080] Referring now to the auxiliary break configuration, the auxiliary brakes 30a and 30b are welded or otherwise affixed to the upper surfaces of the plates 102a and 102b, respectively, adjacent the angled edge 36a, 36b of those plates, such that at least a portion of the break plates 30a and 30b extends over the corresponding cutout defined by those edges. The auxiliary brakes 32a and 32b (also referred to as"brake wheels"or"brake members") are disposed in the cutouts of respective plates 102a and 102b, and upper surfaces of those brakes 32a and 32b are pivoted at 32a'and 32b', respectively, to lower surfaces of the plates 30a and 30b, respectively. The pivots 32a'and 32b'may include, for example, a nut, bolt, and washer assembly or some other suitable pivoting mechanism. Each plate 30a and 30b preferably comprises aluminum, and each brake 32a and 32b preferably comprises stainless steel, although those components may include any other suitable materials instead. Moreover, each brake 32a and 32b preferably has a curved or arcuate edge surface facing the opposite brake, and the edge surface preferably is teethed, serrated, or otherwise abrasive, although in other embodiments a non-abrasive material (e. g. , rubber) may be coated on the edge surface. The plates 30a and 30b and brakes 32a and 32b preferably are arranged such that the mentioned edge surface of each brake (or at least one of the teeth thereof) contacts the standing seam 22 when the base plates 102a and 102b and base plate pads 10 la and lOlb are clamped to the standing seam 22. The brakes 32a and 32b preferably have dimensions of about 1 l/z"x 1 1/2 X 3/8", although in other embodiments, other suitable dimensions may be employed instead. In still another embodiment, the brakes 32a and 32b may be arranged and/or have dimensions such that their edge surfaces do not contact the standing seam 22 under conditions where less than a predetermined minimum force is applied to the bracket 11', and only make contact with the seam 22 when at least the predetermined minimum force is applied to the bracket 11'.

[0081] The brakes 32a and 32b function as a back-up mechanism to even further ensure the stationary positioning of the bracket 11'on the roof 20. For example, when a downward force is applied to the bracket 11', at least some of the force is distributed in the above-described manner through the components of the bracket 11', including the base plates 102a, 102b, base plate pads lOla, lOlb, and the plates 30a, 30b and brakes 32a, 32b, towards the standing seam 22. As a result, the opposing base plates 102a, 102b, the opposing base plate pads lOla, lOlb, and the opposing plates 30a and 30b, are drawn towards one another, the brakes 32a, 32b come into contact with the standing seam 22, and the base plate pads lOla, lOlb clamp the standing seam 22. If less than a predetermined downward force (e. g., over 300 lbs.) is applied to the bracket 11', the edge surfaces of the brakes 30a and 30b merely contact the standing seam 22 but do not firmly engage therewith.

However, if at least the predetermined downward force is applied to the bracket 11', a portion of the force that is distributed to the brakes 32a and 32b causes them to rotate (while in contact with standing seam 22) in a counter-clockwise direction about their respective pivots 32a'and 32b'until the brakes'teeth engage firmly with the standing seam 22. As a result, any unlikely tendency of the bracket 11'to slide appreciably along the surface of the roof 20 is prevented or at least substantially reduced, even when a substantial load is being supported by the bracket 11', and even when the bracket 11'is being used on a wet or otherwise slick roof surface. It can therefore be appreciated that the present embodiment even further ensures the secure positioning of the roof bracket 11'on a roof 20, for supporting scaffolding planks.

[0082] It should be appreciated that the various alternate embodiments of the bracket 11 described above also may apply to the bracket 11', although for convenience, they will not now be further described. For example, in accordance with another embodiment of the bracket 11', one or more latch lock mechanisms 24 such as a stainless steel latch clamp available from Grainger, Carrlane item Model No. CL-250-PA-S, may be employed, and may be secured to the base plates 102a and 102b, to even further ensure and tighten the locking engagement of the bracket 11'to the roof seam 22, although for convenience only a single mechanism 24 is shown. Another mechanism 24 besides the one depicted in the drawings may be secured to another portion of the base plates 102a and 102b as well, such as the portion of the plate 102a between the gusset 2c and plate 30a and the portion of the plate 102b between the gusset 2e and plate 30b, and/or may be positioned above the plates 30a and 30b and secured to the base plates 102a and 102b. Each such assembly 24 can be used in the above-described manner to lockingly engage the bracket 11'with the seam 22, if not engaged already, or to further tighten the locking engagement of the bracket 11'to the standing seam 22, if engaged already.

This capability further ensures that the bracket 11'does not become disengaged with the seam 22, especially in the event that a downward force applied to the work platform 9 is removed.

[0083] While the invention has been particularly shown and described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that changes in form and details may be made therein without departing from the scope and spirit of the invention. For example, many of the dimensions and materials discussed above may be changed without departing from the scope and spirit of the invention. Other modifications may be made as well.