Trench shield ladder
DCFirst Claim
1. A trench shield ladder in combination with a trench shield comprising:
- two spaced apart trench shield walls, a plurality of support rods attaching between the two spaced apart trench shield walls to hold them apart and forming a working space between the two trench shield walls,two approximately parallel front legs for removably engaging an inwardly facing surface of a first trench shield wall, spaced apart main rungs extending between the two legs,a top platform attached approximately perpendicular to upper ends of said legs for engaging said first trench shield wall, hand rails extending over the platform,at least one rear leg attached approximately perpendicular to said top platform and approximately parallel to said front legs for engaging an opposite outwardly facing surface of said first trench shield wall, said hand rails being continuous with both said front and said rear legs, and each of said front legs and each of said rear legs being rigidly secured relative to said platform.
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Accused Products
Abstract
A trench shield ladder that hangs on the wall of the trench shield to provide workmen safe access to a trench. The ladder is provided with a top platform and hand rails that extend over the platform. The ladder can be adjusted in length by employing an extension portion with hooks that hang the extension on the main rungs of the main ladder. The extension portion is not as wide as the main portion of the ladder so that the legs of the extension rest between the legs of the main portion of the ladder. The ladder and extension are provided with stand off arms that hold the main and extension rungs of the ladder away from the wall of the trench shield. The present invention is designed to fit on trench shields of varying thicknesses.
37 Citations
11 Claims
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1. A trench shield ladder in combination with a trench shield comprising:
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two spaced apart trench shield walls, a plurality of support rods attaching between the two spaced apart trench shield walls to hold them apart and forming a working space between the two trench shield walls, two approximately parallel front legs for removably engaging an inwardly facing surface of a first trench shield wall, spaced apart main rungs extending between the two legs, a top platform attached approximately perpendicular to upper ends of said legs for engaging said first trench shield wall, hand rails extending over the platform, at least one rear leg attached approximately perpendicular to said top platform and approximately parallel to said front legs for engaging an opposite outwardly facing surface of said first trench shield wall, said hand rails being continuous with both said front and said rear legs, and each of said front legs and each of said rear legs being rigidly secured relative to said platform. - View Dependent Claims (2, 3, 4, 5)
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6. A trench shield ladder in combination with a trench shield comprising:
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two spaced apart trench shield walls, a plurality of support rods attaching between the two spaced apart trench shield walls to hold them apart and forming a working space between the two trench shield walls, a front ladder with two front legs, spaced apart main rungs extending approximately perpendicular to and between said front legs, a top platform attached approximately perpendicular to said front ladder at an upper end of said front ladder, and at least one rear leg attached approximately perpendicular to said top platform and approximately parallel to said front legs and spaced apart from said front legs, hand rails being continuous with both said front and said rear legs, and each of said front legs and each of said rear legs being rigidly secured relative to said platform. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification