Abstract: A rung which can be installed in a ladder is disclosed which comprises a first plate having first and second ends, each of the first and second ends having a relief tab and an opening, and a second plate, the second plate being identical to the first plate, the first and second plates being nestable such that the relief tabs of the first plate insert through the openings of the second plate to form the rungs.

Abstract: A rung which can be installed in a ladder is disclosed which comprises a first plate having first and second ends, each of the first and second ends having a relief tab and an opening, and a second plate, the second plate being identical to the first plate, the first and second plates being nestable such that the relief tabs of the first plate insert through the openings of the second plate to form the rungs.

Abstract: Ladders and methods for assembling ladders are disclosed herein. A disclosed example ladder includes a mount, a frame including a step, an aperture defined in at least one of the mount and the frame, a lug positioned in the aperture to pivotably and translatably connect the mount and the frame, and a plate. The disclosed ladder also includes a saddle positioned to engage the plate to releasably secure the frame to the mount. The frame can, thus, be displaced from the mount in response to a force to avoid breakage.

Abstract: A fluid tank with a base assembly, a first wall extension member, and a second wall extension member, is provided. The base assembly includes a base member, a first wall, and a second wall. A first end of the base member is integrally attached to the first wall and a second end of the base member is integrally attached to the second wall. Each of the first wall and the second wall includes a stepped portion and a stiffener portion. The first wall extension member includes a first end with a stepped portion and a second end, which is in a first fitted engagement with the stepped portion of the first wall. The second wall extension member includes a first end with a stepped portion and a second end. The second end is in a second fitted engagement with the stepped portion of the second wall.

Abstract: A four-bar linkage ladder is used to provide access to the cab of a mobile machine. The ladder is light enough for manual operation and may include a spring assembly, but avoids the need for the electric, pneumatic, or hydraulic actuators of prior art moveable ladders. The ladder swings from bumper height to an ergonomically desirable height for access and egress and allows passage over uneven terrain without ground contact.