Abstract: Various embodiments of the present invention relate to trench box safety ladders and methods of constructing trench boxes with safety ladders. In one embodiment, a trench box comprises two side walls with a plurality of supports between the two walls, a built-in ladder within the inner face of a side wall, and an extension ladder positioned on the top face of the side wall.

Abstract: A bin ladder construction includes a vertical ladder up the side of a grain storage bin and an inclined ladder from the upper end of the vertical ladder to the peak of the roof of the grain storage bin. Corner pieces of particular shape and configuration interconnect the inclined and vertical ladders. The ladders have hollow rungs open at both ends, and channel members extend through and beyond the ends of a pair of hollow rungs in the vertical ladder and in the inclined ladder. Triangular brackets mount the opposite ends of hand rails to the ends of said channels.

Abstract: A flag-pole (1), tiltable in direction towards an adjacent house or building, and at the lower portion (1') being provided with a device (6) facilitating climbing or transport of persons to the outer edge portion of the roof surface (2) of the house or building. At least the top portion (1") of the flag-pole is tiltable in relation to a vertical plane, thereby extending in a parallel relationship to the roof surface (2), but at a distance therefrom. Alternatively, both the lower portion (1') and the top portion (1") may be tiltable in the same direction, the top portion (1") thereby taking up the above described position, whereas the lower portion (1') takes up a less inclined position, intended to move the upper part of the lower portion (1') adjacent to the outer edge portion of the roof surface (2).

Abstract: A circular ladder for use along a cylindrical wall and having a single stringer which is disposed in a helical path around the cylindrical wall and an array of half treads disposed on each side of the stringer. Each array of half treads is vertically spaced from the other along the length of the stringer, the half treads being affixed to and laterally extending from the respective sides of the stringer. Each half tread includes an outwardly extending portion which terminates in a plane which is forward of a plane passing through the front edges of the treads. First and second handrails are disposed in this forward plane and affixed to the outwardly extending tread portions. In an alternative embodiment, a single outside handrail is employed, the cylindrical wall providing a body support in place of an inside handrail.

Abstract: A ladder which can be ascended and descended at either of two rates and which comprises an array of half treads on one side of a stringer and an array of full treads on the opposite side of the stringer, each array being vertically spaced from the other along the length of the stringer. Treads are affixed to and extend from respective sides of the stringer, and at least one of the arrays includes outwardly extending portions affixed to a handrail.