The present invention relates generally to platforms such as may be erected below a bridge deck for cleaning, painting, or other maintenance work thereon. As used herein and in the claims, the term "platform" is meant to include other forms of scaffolding .

Art which may be of interest to the present invention includes U .S. patents 302,102; 748, 962; 1,658,670; 1,810,579;

1,819,031; 1, 896, 746; 2,303, 428; 2, 740, 873; 2,744,590;

2,882,099; 2, 903, 282; 2,987,148; 2,994,402; 3,144,105;

3,389,929; 3,420,011; 3, 425, 179; 3,635,509; 3, 703,307;

3, 727,362; 3,888,371; 4,042,991; 4, 073, 025; 4,234, 055;

4,244, 152; 4, 253, 548 ; 4, 475, 841; 4,566,245; 4, 574, 535;

4,660,680; 4, 685, 535; 4, 815,563; 4, 967, 875; 5,061,001;

5,203, 428; 5,214,899; 5,274,980; 5,409,082; 5,617, 931

(discloses modular scaffolding utilizing aluminum side

trusses ) ; 5,660,017; 5,704,169; 5, 771,655; 5,771,665;

5,785,148; 6, 205, 739 ; 6,217,344; 6,223, 482; 6,357,549;

6,675,546; 6,799,658; 6, 918, 152; 7,325,796; 7,478,449;

7,614,511; 7,748,681; D364,531, and U.S. patent application publications 2002/0053179; 2003/0010740; 2003/0155319;

2004/0128942; 2005/0077107; and 2007/0196164, all of which are incorporated herein by reference.

Inventor, Lambros Apostolopoulos , has for many years provided, for use by workmen under bridge decks, platforms which comprises a plurality of cables strung between bridge piers or the like and paneling laid cross-wise of the cables and attached thereto. The cables are supported along their lengths by vertical cables attached to the paneling attachment structure and to overlying structural portions of the bridge. These platforms, which have served the industry well over many years, are described more specifically in Inventor's (Lambros Apostolopoulos) U.S. patents 5,730,248; 5,921,346;

6,003,634; 6,135,240; 6,138,793; 6,227,331; 6,264,002; 6,302,237; 6,386,319; and 6,523,644, all of which are incorporated herein by reference.

A modular trussed platform is described in Australian patent 774316 (based on Australian application AU 200138987), the disclosure of which is incorporated herein by reference, which utilizes cluster posts between which truss units are attached, which allows the trusses to span in both

longitudinal and transverse directions. Each cluster post has 4 circumferentially spaced slots for receiving end edges of the truss units. The truss units are attached to the cluster posts by lock pins. It is stated on page 7 thereof that each section can be cantilevered prior to hanging. Fig. 7 thereof shows a structure suspended by suspension wire attached to cluster posts or trusses. Fig. 9 thereof shows cluster posts extending below the trusses to support a deck from below.

Such a system requires cranes or the like to move the trusses into position for attachment, which is cumbersome and

expensive .

U.S. patent application publication 2005/0217936, published October 6, 2005 (and PCT application publication WO2005096725, published October 20, 2005, is believed to correspond and be cumulative thereto) , and the disclosures of which are incorporated herein by reference, discloses a work platform wherein a plurality of joists, such as trusses, are pivotally attached to a plurality of hubs. The hubs have cylindrical middle sections and upper and lower planar

elements with circumferentially spaced holes therein for connecting the joists. Pins are received in the holes and in holes in the joists for connecting the joists to the hubs so that the joists articulate. Hubs are suspended from a bridge or other structure by cables or chains. Erection of the structure requires the workers to hold the heavy joists adjacent the edges of previously installed platform segments, apply the pins, then push the articulated heavy joists into position. Such a process is very dangerous due to the chances of slipping and falling. In addition, there is difficulty with such a truss structure in building around obstacles and in tight areas.

It is accordingly an object of the present invention to provide a modular platform/scaffolding structure which can be erected and dismantled easily and safely and quickly, without the use of cranes or other heavy equipment.

It is another object of the present invention to provide such a modular structure which has the flexibility in erecting to allow building easily around obstacles and in tight areas.

It is a further object of the present invention to provide such a modular structure wherein each of the

individual components can be easily manipulated and attached and unattached by a single person.

It is a still further object of the present invention to provide such a modular structure which has a generally flat walking surface.

It is yet another object of the present invention to provide such a modular structure which is rugged and reliable and strong and has minimal height (vertical dimension) .

In order to provide such a modular platform/scaffolding structure, in accordance with the present invention, frame beams have apertures spaced in their flanges (along each side) over their lengths to receive pins for swingably receiving the ends of deck support beams thereby to allow flexibility in locating the deck support beams along the lengths of the frame beams. Further in accordance with the present invention, the ends of two frame beams are connected by pins received in end ones of the frame beam apertures and in a first connector, in a manner allowing one frame beam to be substantially side-by- side with the other frame beam while being connected and then allowing it to be swung into a position wherein the frame beams are co-axial and then rigidly secured in that position by pins received in the other end apertures (on respectively opposite sides of the respective frame beam flanges) and in a second connector.

The above and other objects, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiment ( s ) thereof when read in conjunction with the appended drawings wherein the same reference numerals denote the same or similar parts throughout the several views .

Brief Description of the Drawings

FIG. 1 is a perspective view of a portion of a platform which embodies, shown schematically attached to a bridge.

FIG. 2 is a partial perspective view illustrating the attachment of the ends of two frame beams of the platform.

FIG. 3 is a section view taken along lines 3-3 of FIG. 2.

FIG. 4 is a perspective view of a pin for the attachment of the frame beams.

FIG. 5 is a partial perspective view illustrating the attachment of a deck support beam to one of the frame beams.

FIG. 6 is a partial perspective view illustrating the attachment of one edge of a deck member to a deck support beam.

FIG. 7 is an enlarged detail view of the attachment of FIG. 6.

FIG. 8 is a partial plan view of the attachment of FIGS. 6 and 7.

FIG. 9 is an edge view showing the attachment of FIG. 8.

FIG. 10 is a partial plan view of the attachment of the opposite edge of the deck member of FIGS. 6 to 9 to another deck support beam.

FIG. 11 is a view similar to that of FIG. 9 showing the attachment of FIG. 10.

FIG. 12 is a perspective view of a shackle for attachment of the platform to the bridge and illustrating its attachment to a frame beam.

FIG. 13 is a perspective view of the mount for the shackle .

FIG. 14 is an exploded view of various components of the platform.

FIG. 15 is an enlarged detail view, partly in section, illustrating a seal inserted between edges of attached frame beams .

FIG. 16 is a generally schematic view of a hand rail attached to the platform.

FIG. 17 is a plan view of a frame beam.

FIG. 18 is a side view of the frame beam.

FIG. 19 is an end view of the frame beam.

FIG. 20 is a plan view of a deck support beam with attachment members attached at the ends thereof.

FIG. 21 is a side view of the deck support beam and attachment members .

FIG. 22 is an end view of the deck support beam and attachment members .

FIG. 23 is a side view of a frame beam connector.

FIG. 24 is a plan view of the frame beam connector.

FIG. 25 is an end view of the frame beam connector.

FIG. 26 is a sectional view of a frame beam connector showing the pin received in an aperture thereof and in the corresponding frame beam apertures.

FIGS. 27 and 28 are schematic views of a portion of the platform in successive stages of assembly.

Detailed Description of the Preferred Embodiment ( s )

Referring to FIG. 1, there is shown generally at 20 a portion of a modular platform which may be used, for example, for work such as cleaning or painting to be conducted on a bridge a portion of which is illustrated at 22. The platform 20 includes a group of pluralities of interconnected frame beams 24 extending cross-wise of the bridge 22 and deck support beams 26 extending length-wise of the bridge 22 between frame beams 24, it being understood that, alternatively, the frame beams may extend length-wise of the bridge 22 and the deck support beams may extend width-wise of the bridge 22. Vertical cables or chains 28 (only one shown) or the like connect the frame beams 24 to the overhanging bridge structure 22 for support of the platform 20. The cables 28 are connected to shackles 29 which are in turn attached to the frame beams 24, as shown in FIG. 12. As long as sufficient support is provided, it is of course not

necessary that every single frame beam 24 be connected to the bridge structure 22 by a cable 28, and, as seen in FIG. 1, a single frame beam 24 may be supported by two or more cables 28. Instead of being supported by hanging from cables, it should be understood that platform 20 may be supported from below, for example, by columns on which some or all of the frame beams 24 are supported, or may otherwise be suitably supported. The platform 20 may of course be used for other purposes such as for scaffolding. Paneling, illustrated at 30, such as, for example, plywood flooring is laid across the deck support beams 26 and secured thereto as is discussed in greater detail hereinafter or in other ways commonly known to those of ordinary skill in the art to which the present invention pertains, to complete the platform 20. FIG. 1 shows two groups of frame beams 24 each group having two frame beams 24 shown connected end-to-end co-axially, as illustrated by their having a common longitudinal axis, illustrated at 25. It should be understood that the platform 20 may have any number of groups of frame beams 24 and any number of frame beams 24 in each group, for example, the number of groups may be determined by the bridge length or portion thereof to be spanned, and the number of frame beams 24 in each group determined by the bridge width or portion thereof to be spanned. For purposes of clarity of illustration, three deck panels 30 are shown covering a portion of the platform portion 20 of FIG. 1, it being understood that three other deck panels 30 would cover the other portion thereof. Each of the deck panels 30 is shown to be laid to extend between and be

connected to two deck support beams 26, as hereinafter

discussed in greater detail, and to overlie, centrally

thereof, another deck support beam 26, it being understood that various other deck panel layouts are envisioned, for example, the number of deck panels may vary and they may overlie none or a greater number of deck support beams 26.

Each beam 24 and 26 is composed of aluminum or other suitable light-weight strong material and is suitably short so that its weight is such (less than about 50 pounds) that it can be easily and quickly manipulated and connected and unconnected by a single person. For example, each of the frame beams 24 may be about 8 to 10 feet long, and each of the deck support beams 26 may be about 12 feet long. The deck support beams 26 have a smaller depth for reasons discussed hereinafter. The frame and deck support beams 24 and 26 respectively may be, for example, I-beams having sizes 1-6 and 1-4 respectively, i.e., depths, along their central webs, of 6 and 4 inches respectively, with the result that the deck support beams 26 can be inserted between the flanges of the frame beams 24, as discussed hereinafter. Each of the plywood panels 30 may, for example, be composed of treated fire resistant plywood and be 4 feet by 8 feet and have a thickness of about 3/4 inch, so that, weighing, for example, less than about 50 pounds, it may be easily and quickly manipulated and connected and disconnected by a single person. The short aluminum beams 24 and 26 are, for example, lighter than the plywood panels 30, so that each of the platform components has a weight (less than about 50 pounds) such that it can be easily and quickly manipulated and connected and disconnected by a single person, thus reducing the amount of required manpower for erecting and disassembling the platform 20.

Each of the frame beams 24 comprises upper and lower flanges 32 and 34 respectively connected by a central vertical web 36. A quantity of spaced apertures, illustrated at 38, which may, for example, have a diameter of about 11/16 inch, are provided along and adjacent each edge of the upper and lower flanges 32 and 34 respectively. In order to maximize flexibility for positioning of the deck support beams 26 and shackles 29 along the lengths of the frame beams 24

respectively, the apertures 38 are preferably spaced closely together, preferably in equal increments. For example, the apertures 38 may be spaced about 12 inches (on centers) apart, as illustrated at 39, with end apertures, illustrated at 40, (on centers) being spaced, for example, about 3 ½ inches from the frame beam edge and about 2 3/8 inches from the adjacent set of apertures 38. As seen in FIG. 2, when attached, there is a gap, illustrated at 41, between the edges of the frame beams 24, this gap 41 being, for example, about 1/4 inch.

As seen in FIG. 5, the deck support beams 26, which also have upper and lower flanges 42 and 44 respectively connected by a central vertical web 46, are suitably attached to the frame beams 24 such as, for example, by aluminum blocks 48 each having a central aperture 50 (FIG. 14) extending

vertically entirely therethrough, as described in greater detail hereinafter.

Each group of frame beams 24 comprises a plurality of frame beams 24 connected end-to-end co-axially to extend the width of the bridge 22 or otherwise desired distance, with additional groups of frame beams 24 laid parallel thereto along the bridge length or otherwise desired distance (with the deck support beams 26 inserted between and attached at their ends to respective frame beams 24 to extend normal or perpendicular thereto) .

As seen in FIGS. 2 to 4 and 23 to 28, a pair of end-to- end co-axial frame beams 24 are connected by a pair of

connectors 52, which may, for example, be blocks composed of extruded aluminum or other suitable material and having a pair of spaced apertures 54, whose spacing is such as to allow them to be aligned with the apertures 40 adjacent the ends of the respective frame beams 24, leaving the gap 41. When the pair of frame beams 24 is in the rigidly attached end-to-end co ^¬ axial relationship to maintain the co-axial relation, as seen in FIG. 28, the pair of connectors 52 span the ends of the flanges 32 and 34 respectively on the respective flange sides. The connection to each frame beam 24 is by means of a pin 56 which is received in the respective upper and lower flange apertures 40 and in the respective connector aperture 54, which may, for example, have a diameter of about 5/8 inch, as discussed in greater detail hereinafter. The pin 56 may be composed, for example, of suitably hardened steel or stainless steel and have an upper cap portion 58 to rest on top of the upper flange 32 and a lower tapered or pointed end 60 for ease of insertion.

In order to install a frame beam 24 to a previously installed frame beam 24, the frame beam 24 to be installed may be held in a substantially side-by-side relation relative to the previously installed frame beam 24, as illustrated in FIG. 27, and one of the connectors 52 attached by insertion of the pins 56 respectively. The frame beam 24 to be installed is then swung (about the off-center attachment of the pins 56) around, as illustrated at 57 in FIG. 27, to position it in the desired end-to-end co-axial relation with the previously installed frame beam 24, as illustrated in FIG. 28, and the second connector 52 attached by insertion of the pins 56 respectively .

The beams 24 and 26 may be provided in different lengths to allow flexibility in construction, but the beams 24 are otherwise desirably identical and the beams 26 are otherwise desirably identical and the connectors 48 are desirably identical to allow minimization of the types of parts needed for erecting the modular platform. Likewise, the first and second connectors 52 and the pins 56 are desirably identical.

As seen in FIG. 5, a deck support beam 26 is attached to a frame beam 24 by means of block 48. The block 48 may advantageously be formed by machining an extruded block 52 to form therefrom a portion 62 containing one of the apertures 54 and two spaced flanges 64 (only one seen in FIG. 5) extending laterally therefrom. Each of the flanges 64 is sized height- wise to fit between the deck support beam flanges 42 and 44 and is shown to have three aligned triangularly-spaced

apertures, illustrated at 66, which also align with apertures (not shown) in the respective end of the deck support beam web 46 wherein the web 46 is sandwiched between the flanges 64, and bolts 68 are inserted in the apertures 66 and the deck support beam web apertures respectively and nuts (not shown) suitably applied to rigidly secure the machined block 62 to the respective end of the deck support beam 26.

With the block 62 thusly rigidly attached, the block portion 62 is received between the flanges 32 and 34 with its aperture 54 aligned with the apertures 38 and a pin 56

inserted within the respective flange apertures 38 and the block aperture 54, similarly as the pins 56 attach the

extruded blocks 52 to the ends of two frame beams 24 to connect them together, as discussed in greater detail herein. During such attachment, the deck support beam 26 may desirably be held next to or alongside the frame beam 24, i.e., in a substantially side-by-side relation, as illustrated in FIG. 28, then swung into position, as illustrated at 59 in FIG. 28, after the pin 56 has been inserted, to the position shown in FIG. 1 wherein deck support beam 26 is normal or perpendicular to the respective frame beam 24. The ends of the flanges 42 and 44 are suitably chamfered, as illustrated at 67, for example, over a distance of about 6 inches, to narrow ends 70 to prevent interference with the corresponding frame beam 24. The close spacing of the frame beam apertures 38 allows flexibility for positioning of the deck support beams 26 generally anywhere there along, including flexibility for erecting around obstacles and in tight areas.

The attachment of a second frame beam 24 to the other ends of deck support beams 26 previously attached to a first frame beam 24 may be with the deck support beams 26 rotated or swung into a position adjacent (substantially side-by-side with) the first frame beam 24, then the assembly rotated out into position for attachment of the second frame beam 24 in end-to-end co-axial relation with a previously attached frame beam 24. Thus, the frame beams 24 and the deck support beams 26 may desirably be attached in either order, allowing

flexibility for erection.

Referring to FIGS. 6 to 11, opposite ends of each

flooring panel 30 is suitably attached to extruded aluminum (or other suitable material) elongate members 72 which are in turn attached to respective deck support beams 26, as

described hereinafter. Thus, each of the members 72 has an upper slot, illustrated at 76, extending into one side thereof and defined by a thin upper lip 78 and in which is

frictionally or snugly received the respective edge portion of the respective flooring panel 30. A notch, illustrated at 74, is formed in the other side lower corner of the member 72 in which is receivable the respective one side of the upper flange 42.

FIGS. 8 and 9 illustrate the member 72 as applied to one panel edge and the means for its attachment to the respective deck support beam 26, and FIGS. 10 and 11 illustrate the member 72 as applied to the opposite panel edge and the means for its attachment to the respective deck support beam 26.

Referring first to FIGS. 8 and 9, a pair of spaced plates 75 (near the ends of the member 72) are suitably attached such as by screws or bolts or welding (not shown) to the lower surface of the member 72, the plates 75 extending inwardly to overlap the notch 74 and form therewith a slot, illustrated at 77, in which the respective facing side or half of the upper flange 42 is received for the purpose of securing the one side of the panel 30.

Referring now to FIGS. 10 and 11, a suitably spring- loaded locking mechanism 86 having a protrudable bolt or tongue 88 is suitably attached such as by screws or bolts (not shown) to the lower surface of the member 72, centrally thereof, the bolt 88 when protruding extending inwardly to overlap the notch 74 and form therewith a slot, illustrated at 77, in which the respective facing side or half of the upper flange 42 is received for the purpose of securing the other side of the panel 30. The locking mechanism 86 and bolt 88 are similar to mechanisms and bolts found on many doors to cause a door to automatically lock when pulled closed. Thus, the bolt 88 is adapted to be pushed into the locking mechanism 86, which is spring-loaded to bias the bolt 88 to the outward position shown in FIG. 11. The bolt 88 lower surface is suitably shaped to cause the bolt 88 to be pushed inwardly of the locking mechanism 86 when force is applied to it from above against the upper flange 42. The spring-loaded

mechanism 86 forces the bolt 88 outwardly into the position shown in FIG. 11 once the upper flange 42 is cleared. The principles of construction of such a locking mechanism 86 and bolt 88 are well known to those of ordinary skill in the art to which the present invention pertains.

In order to attach a deck panel 30 between two deck support beam 26, the connectors 72 are applied to the opposite panel edges and may be suitably glued thereto, the two

connectors 72 for one edge having the members 75 attached and the connector 72 for the other edge having the locking

mechanism 86 and bolt 88 attached. The panel 30 is positioned so that the flange 42 is received in the slot 77 formed by the member 75. Then, with the bolt 88 lying above the flange 42 for the other deck support beam 26, downward force is applied, causing the bolt 88 to retract into the locking mechanism 86 so that the flange 42 can be received in the slot 77 formed by the bolt 88. Then, the spring force of the locking mechanism 86 forces the bolt 88 back outwardly to again form the slot 77 with the flange 42 securely received therein. Once in place, the panels 30 make the platform portion rigid.

As seen best in FIGS. 9 and 11, the lower surface of the slot 76 is even with or slightly higher than the surface formed by the notch 74 which rests on top of the deck support beam flange 42 which allows the panels 30 to be positioned height-wise to clear other deck support beams 26, as desired. Thus, as seen in FIG. 1, a deck support beams 26 may be positioned centrally under the three panels 30 for added support thereof as well as making erection easier. As also seen in FIGS. 9 and 11, the lip 78 can be formed to be very thin, such as, for example, 1/8 inch, so that a substantially even or almost flush walking surface may desirably be

achieved .

Referring to FIGS. 12 and 13, an extruded block 90 of aluminum or other suitable material is provided to attach each shackle 29 (for example, a 3/4 inch shackle) to a frame beam 24. The block 90 is formed to have two apertures, illustrated at 92, extending vertically therethrough and spaced to be alignable with a pair of inner and outer apertures 38 on the frame beams 24. The block 90 is attached by suitable means such as, for example, a pair of bolts 94 (for example, 5/8 inch bolts) received in the apertures 92 and 38 respectively and nuts 96 applied to the bolts 94 to rigidly secure the block 90. A slot, illustrated at 98, is suitably formed in the lower surface of the block 90. When attached to the respective frame beam 24, it forms therewith an opening in which is receivable a fastener member 100 for attaching the shackle 29 to the frame beam 24.

Referring to FIG. 15, an elastomeric seal member or self- sealing rubber seal 102 has a central portion 104 which is received within the gap 41 between adjacent flanges 32 of frame beams 24 respectively and terminates in an enlarged lower portion 106 which is receivable below and engages the lower surfaces of the flanges 32 so that it is securely held within the gap 41. The seal 102 extends over the entire length of the gap 41. The upper end of the central portion 104 terminates in a cap portion 108 which is sized to cover the caps 58 of the pins 56 to protect and secure them against dislodgement . The elastomeric material is such as to allow the portion 106 to be compressible to be passed through the gap 41 then expand to secure the seal 102 against

dislodgement. During disassembly, the portion 106 can then be compressed again by application of suitable pulling force for passage through the gap 41 and removal of the seal 102.

Similar seals may be provided in other gaps in the platform such as, for example, in gaps between panels 30.

At the ends of a group of frame beams 24, the apertures 40 are not needed for attachment of another frame beam.

Referring to FIG. 16, there is shown schematically the

attachment of an elongate vertical railing post 110 at one of these ends for a hand rail for perimeter protection, the hooks 112 being for the running of cables or lines between posts 110. The post 110 may be attached in any suitable way, for example, by supporting locking mechanisms which contain bolts or tongues or pins, illustrated at 111, which are suitably caused to lockingly pop into the apertures 40 in a manner commonly known to those of ordinary skill in the art to which the present invention pertains.

It is important to prevent metal-on-metal rubbing contact during needed rotation where the pins 56 are used to join members. Referring to FIG. 26, wherein a pin 56 is shown received in apertures 40 and 54 of a frame beam 24 and

connector 52 respectively, four identical washers or grommets 114 composed of Teflon polymer are received to prevent such contact. Each of the washers 114 has a tubular portion 116 and a flat portion 118 extending laterally and radially outwardly from one end thereof. At the upper end, the flat portions 118 of two washers 114 are received between the upper end surface of the connector 52 and the lower surface of the lower flange 32, the tubular portion of the upper of the two upper washers 114 extends upwardly and is received between the pin 56 and the wall of the aperture 40, and the tubular portion of the lower of the two upper washers 114 extends downwardly and is received between the pin 56 and the wall of the aperture 54. The two lower washers 114 are similarly positioned, as shown in FIG. 26. The provision of the washers 114 leaves a gap, illustrated at 120, over most of the height of the aperture 54 between the ends, illustrated at 122, of the lower of the upper washers 114 and the upper of the lower washers 114. As a result, there is virtually no rubbing contact between metal components, the pins 56 desirably touching only Teflon material. The washers 114 are sized so that the tubular portion 116 of the upper one of the washers 114 has a terminal upper end portion 126 which extends

slightly above the upper flange 32, for example, about 1/16 inch, so as to prevent rubbing contact with the flange 32 by the pin cap 58. These washers 114 may be glued in place.

These washers are not depicted in FIG. 14. Similar washers of Teflon polymer are used similarly in connecting the deck support beams 26 to the frame beams 24. The washers 114 may be made of other suitable polymer or other materials which provide reduced friction contact for easier movements while preventing undesirable metal-to-metal contact.

Regulations in some countries may require the handling of a component by two persons if its weight exceeds, for example, 55 pounds. In accordance with the present invention, in order that two persons not be required (by government regulation or otherwise) to handle any component so as to reduce the amount of manpower needed to erect the platform 20, each of the components is sized and made of a material so that it weighs less than about 50 pounds. Thus, the heaviest of the

components in the platform 20 as described herein, which is a plywood panel 30, is sized to weigh less than 50 pounds, and the remaining components are sized and made of a material to also weigh less than 50 pounds. As discussed herein, aluminum is the material of which most of the components is made, aluminum having a density of about 0.1 pounds per cubic inch, as compared to steel having a density of about 0.28 pounds per cubic inch. Thus, the substantially lesser density of aluminum desirably allows the achievement of the component weight of less than 50 pounds for all components of the platform 20.

Thus, in accordance with the present invention, the light-weight components of the modular platform 20, allowing one person to be able to carry the heaviest component, may be connected together easily and safely and quickly without the need for cranes or other heavy equipment and while allowing flexibility for erecting around obstacles and in tight areas. Most of the major parts (including the frame beams 24, the deck support beams 26, frame beam connector blocks 52, and shackle blocks) are advantageously extruded from aluminum or other suitable light-weight material, and the deck support beam connector blocks 48 advantageously machined from the frame beam connector blocks 52, thus desirably providing ease of manufacture with little or no welding, thereby further allowing more uniform preciseness for ease of assembly.

It should be understood that, while the present invention has been described in detail herein, the invention can be embodied otherwise without departing from the principles thereof, and such other embodiments are meant to come within the scope of the present invention as defined by the appended claims .