Abstract: A pair of elongated stabilizing supports and a pair of mounts for support by opposite side rails of the ladder. The stabilizing supports each include a pair of generally parallel arms and have a first pair of end portions free of connections extending therebetween and connecting structure extending between and connecting the second pair of end portions thereof. Support structure mounts the stabilizing supports from the mounts in upwardly convergent positions with the first pair of end portions uppermost and for lengthwise adjustable shifting of the stabilizing supports relative to the mounts. The first pair of end portions of the stabilizing supports, when the latter are in upper adjusted positions thereof, embracingly receive the corresponding ladder side rails therebetween.

Abstract: Lateral stabilizing supports for a ladder which are secured to the ladder by a pair of horizontal braces which extend through hollow rungs for added strength and means for modifying the length of one of the legs of the ladder as well as the supports to compensate for irregularities in the surface upon which the ladder is standing. A simple, quick acting locking arrangement is provided for locking the adjustable legs in their operative positions.