| US9488001B2 | 2016-11-08 | |||
| US20020134619A1 | 2002-09-26 | |||
| US20170356245A1 | 2017-12-14 | |||
| US5664643A | 1997-09-09 | |||
| US20170058605A1 | 2017-03-02 | |||
| US20050045421A1 | 2005-03-03 | |||
| NZ574788A | 2010-09-30 |
| I CLAIM: 1. An apparatus for restraining the movement of a ladder, said apparatus comprising: a plate adapted for attachment to the roof of a structure, said plate having a stationary bracket extending from an edge of said plate; a movable bracket adapted for attachment to said plate, said movable bracket having a portion thereof that extends from an edge of said movable bracket; and wherein said stationary bracket and said moveable bracket cooperate to receive and retain the respective side support rails of a ladder when said ladder is leaned against said structure. 2. The apparatus of claim 1, wherein said plate includes a plurality of holes for securing said plate to said roof using a fastening device. 3. The apparatus of claim 2, wherein said fastening device is a nail. 4. The apparatus of claim 1, wherein said movable bracket includes an elongated slot through which said movable bracket is attached to said plate using a fastening device. 5. The apparatus of claim 4, wherein said fastening device is a nut and bolt. 6. An apparatus for restraining the movement of a ladder, said apparatus comprising: a plate adapted for attachment to the roof of a structure, said plate having first and second rotating brackets that when rotated to a first position extends from the edge of said plate and when rotated to a second position is within the boundary of said plate; and wherein when said first and second brackets are rotated to said first position said brackets cooperate to receive and retain the respective side support rails of a ladder when said ladder is leaned against said structure. 7. The apparatus of claim 6, wherein said plate includes a plurality of holes for securing said plate to said roof using a fastening device. 8. The apparatus of claim 7, wherein said fastening device is a nail. 9. The apparatus of claim 6, wherein said first and second brackets are rotatably attached to said plate using a fastening device. 10. The apparatus of claim 6, wherein said first and second brackets and said plate have a locking device that locks said first and second brackets in said first positon. 11. The apparatus of claim 6, wherein locking device is forms of a pin inserted through corresponding holes in said first and second brackets and said plate. |
CROSS REFERENCE TO RELATED APPLICATION
This application claims priority to provisional application No. 62/614,863 entitled“An Apparatus For Restraining Movement Of A Ladder” filed on January 8, 2018, which is incorporated herein by reference.
TECHNICAL FIELD
The present invention generally relates to the field of safety devices and more particularly, is directed to an apparatus for restraining the movement of the ends of a ladder to help prevent the ladder from moving and causing injury to a person standing on the ladder or someone in close proximity to the ladder.
BACKGROUND
Ladders are typically used to gain access to elevated locations or surfaces and come in various shapes and sizes.
As illustrated in Figure 1, a step ladder is a free standing structure with wide flat steps 1 positioned between one of two pairs of legs 2 and 3 which are hinged at a top 4. Step ladders are used to safely reach relatively low elevated locations or surfaces.
Figure 2 illustrates a further embodiment of a ladder that is comprised of a pair of parallel side rails 21 and 22 that are held together by a plurality of spokes or steps 23. Ladders of the type illustrated in Figure 2 are typically used to reach higher locations and surfaces than the customary step ladder.
For still higher locations and surfaces, an extension ladder such as illustrated in Figure 3 is used. An extension ladder is comprised of two sections 31 and 32, such as the type illustrated in Figure 2, arranged so that they fit together or extends on a sliding mechanism almost to the full length of the two sections. Thus, extension ladders provide a range of height adjustment dependent on the height of the location or surface to be reached.
A great deal of care must be exercised when using ladders of any type due to the likelihood of falling. Ladder related accidents, such as falls, can lead to serious injury.
The consequences of falls are magnified by the height of the structure on which a ladder is used. For example scaling a ladder to reach the roof of a building represents a substantial risk of falling. More importantly, the risk is increased if the ladder is not restrained from moving at it lower and upper ends. The present invention addresses this safety concern.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features of the present invention are set out with particularity in the appended claims, but the invention will be understood more fully and clearly from the following detailed description of the invention as set forth in the accompanying drawings in which:
Figure 1 illustrates one embodiment of a step ladder as known in the prior art;
Figure 2 illustrates one embodiment of a ladder as known in the prior art; Figure 3 illustrates one embodiment of an extension ladder as known in the prior art;
Figure 4 is a top view of one embodiment of an apparatus for restraining the movement of a ladder in accordance with the present invention;
Figure 5 is a top view of a further embodiment of an apparatus for restraining the movement of a ladder in accordance with the present invention;
Figure 6 is an illustration of the embodiment of the present invention as shown in Figure 4 in use on a roof;
Figure 7 is an illustration of the embodiment of the present invention as shown in Figure 5 in use on a roof; and
Figures 8 - 10 are dimensional construction diagrams of the embodiments of the present invention as shown in Figures 4 and 5.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A preferred embodiment of the present invention will be described with further reference to the drawings.
Figure 4 illustrates one embodiment of an apparatus for restraining the movement of a ladder in accordance with the present invention.
As shown in Figure 4, the apparatus comprises a plate 40 having a plurality of apertures or holes 41 which allow plate 40 to be temporarily nailed or otherwise secured, for example, to the edge of a roof as shown in Figures 6 and 7.
Plate 40 also includes a ladder retraining tab 42 which projects outward from the edge of plate 40. The apparatus further includes a slotted ladder lock bar 43 which is attached to plate 40 with one or more fasteners 44. Fasteners 44 can be tighten down to secure bar 43 in one of a number of lateral positions about plate 40 as indicated by arrow 45.
Bar 43 also has a ladder retraining tab 46 which projects out from plate 40. As also illustrated in Figure 4, a pair of anchor points 47 and 48 is provided which form a rotatable retainer to which a strap, rope or other device may be attached for holding the apparatus during transport or carrying to a roof top for installation.
When a ladder is leaned against a building with plate 40 in place, the side rails of the ladder, for example rails 21 and 22 as shown in Figure 2 (or the side rails of ladder 31 as shown in Figure 3) are positioned between ladder retaining tabs 42 and 46 and the location of lock bar 43 is adjusted accordingly along arrow 45 to prevent the top end of the ladder from moving. Lock bar 43 may then be secured in position by fasteners 44. Thus, the elevated end of the ladder can be stabilized, making the ladder safer to use.
The present invention may also be used to stabilize the lower end of the latter in a similar fashion.
Figure 5 illustrates a further embodiment of an apparatus for restraining the movement of a ladder. In this embodiment, a pair of pivoting ladder rail locks 51 and 52 is used to secure the side rails of a ladder as shown in Figure 7.
Rail locks 51 and 52 have respective pivot points 53 and 54 which, by way of example only, may be formed of a nut and bolt combination or a rivet. Thus, rail locks 51 and 52 rotate about these pivot point so that the rail locks can be rotated into place in order to secure the side rails of the ladder to the apparatus as shown in Figure 7. Thus, the end of the ladder is locked to the apparatus in order to prevent lateral movement of the ladder.
Rail locks 51 and 52 include a hole 55 which overlaps a corresponding hold 56 when the rail locks are moved into place to lock the side rails of the ladder. Pins 57 and 58 may then be inserted through the respective holes to prevent the rail locks from moving. As shown in Figure 5, pin 57 is already inserted in its respective holes 55 and 56.
To insure that the pins 57 and 58 do not become lost or misplaced, they are secured to the apparatus with respective cords 59 and 60 as shown in Figures 5 and 7. Cords 59 and 60 may be made of steel braided cable incased in plastic or other suitable materials.
Figures 8 - 10 dimensionally illustrate the construction of the embodiments of applicant’s apparatus for restraining movement of a ladder as shown in Figures 4 - 7.
The various elements of the apparatus may be fabricated from a number of materials, including metals, plastics and composites as one of ordinary skill in the art would understand.
While the foregoing specification teaches the principles of the present invention, with examples provided for the purpose of illustration, it will be appreciated by one skilled in the art from reading this disclosure that various changes in form and detail can be made without departing from the true scope of the invention.