Abstract: According to the present invention, a ladder having an adjustable length comprises: a first support including a first outer support and a first inner support inserted into the first outer support; a horizontal foothold for connecting the first supports to each other; a first gear formed at the inner side of the horizontal foothold and having a groove part formed therein; a second gear engaging with the first gear and changing the rotational direction of the first gear; a rotary bar coupled to the second gear; a third gear formed at the end of one side of the rotary bar; a screw bolt having a fourth gear, which engages with the third gear and is formed at the end thereof, formed inside the first inner support, formed in a stick type, and having threads formed on the outer side thereof; and a screw nut in which the screw bolt is formed, and to which the first inner support is coupled at the outer side thereof.

Abstract: Apparatus for stabilizing a two-legged ladder against lateral and rearward movement. Telescoped tubular pole assemblies are attached at one end to opposite side rails of the ladder with a quick disconnect universal pivot. Special support and retainer blocks are provided for facilitating the transport of the assembled ladder and telescoped assemblies on the top of a vehicle.

Abstract: An all purpose ladder includes a fixed base ladder segment that is conventionally made with long side pieces that are connected together by rungs or steps. An upper ladder segment comprises a pair of long side pieces connected together by rungs. As is conventional with extendible ladders, the side pieces of the upper ladder segment are in sliding engagement with the side pieces of the base ladder segment. A screw or worm shaft is rotatably mounted to one side piece of the lower ladder segment and a threaded bracket engages both the upper ladder segment and the screw or worm shaft such that when the screw or worm shaft is rotated about its longitudinal axis, the bracket travels along the length of the screw or worm shaft, thereby moving the upper segment relative to the fixed base ladder segment. Gears and a handle are provided so that a user can adjust the relative extension position between the base ladder segment and the upper ladder segment on a continuous basis.

Abstract: A folding step ladder is provided wherein a ladder having side leg portions with at least three steps extending between and fixedly connected to the side leg portions is supported by at least a pair of support legs pivotally mounted on the top end portion of the ladder for pivotal movement in a plane parallel to the plane extending between the side leg portions and at least one additional support leg pivotally mounted on the top end portion of the ladder for pivotal movement in a plane parallel to the planes of the side leg portions and wherein each of the pair of support legs and the additional leg are provided with slidable extension tubes so that the ladder may be supported to extend in a vertical direction on any supporting surface. Also, another ladder is connected to the folding step ladder for relative sliding movement therebetween so as to provide a folding extension step ladder.

Abstract: A ladder including a lower step section and a strut pivotally connected together at their upper ends for swinging movement between a collapsed position toward each other and a downwardly divergent erected position, an upper step section pivoted to the upper end of the lower step section for swinging movement between a folded position along the lower step section and an erected position inclining as an extension of the lower step section, and a catch pivotally connected to the upper step section for swinging movement between a gravitationally depending retracted position along the upper step section when the ladder is folded to a gravitationally depending position from the upper step section to hooked engagement with a lug on the lower step section when the upper step section is extended.

Abstract: A ladder including a lower step section and a strut pivotally connected at their upper ends for swinging movement between a collapsed position one within the other and a downwardly divergent erected position, and an upper section pivoted to the upper end of the lower step section for swinging movement between a folded position closely overlying the lower step section and an erected position inclining as an extension of the lower step section.