Abstract: The present invention is used on stepladders that are structured to provide improved lateral stability, step support and equipment/supplies support for stepladder users. The stepladder may have a step element and a support element rotatably attached at a top platform or a first step element rotatably attached to a second step element adjacent a top step. A hinged strut may be attached at opposed ends between the opposed elements intermediate the ladder top and the ladder base. A plurality of steps may be spaced apart and attached between step rails of step elements. A lateral support leg may be rotatably attached at a top end to each of the step rails intermediate a second step and a third step from the ladder top and a hinged leg strut may be attached at opposed ends between each of the support rails and lateral support legs.

Abstract: A collapsible platform having a scissor-like legs, a maintenance platform, a ladder to mount the platform, and a removable pin for a plurality of slots to raise the platform to different heights, and when the pin is removed, the apparatus lies flat for storage.

Abstract: An arrangement in or for a boom lift or other type of lift or load-bearing apparatus, in which a stabilizing moment is imparted based on at least one state of at least a portion of the boom or other portion of the lift or load-bearing apparatus. Also contemplated is an arrangement for redistributing mass responsively, based on at least one state of at least a portion of a load-bearing apparatus.

Abstract: An apparatus includes a generator assembly having a power source operable to power a generator. The generator is connected to a battery assembly having one or more batteries. The battery assembly is operably connected to a drive system, such as an electric drive propulsion assembly and/or an electric or hydraulic positioning assembly. A selector is operably connected to the generator assembly to select either the battery assembly or both of the generator assembly and the battery assembly to power the apparatus.

Abstract: An upper boom compensation system for an aerial device having an articulating boom assembly. The lower boom is raised and lowered by a special double cylinder having two pistons and a common piston rod. A hydraulic circuit is arranged to transfer fluid between the lower boom cylinder and the upper boom cylinder in a manner to raise and lower the upper boom correspondingly to raising and lowering of the lower boom. The upper boom can also be controlled independently of the lower boom.

Abstract: A platform leveling system for an aerial lift truck utilizes a master/slave combination of helical hydraulic rotary actuators to automatically level the work platform in response to movements of the boom. For a two-stage aerial lift comprised of a lower boom and an upper boom, a first rotary actuator is coupled to the base of the lower boom, a second rotary actuator is coupled to the elbow where the upper boom is hinged to the lower boom, and a third rotary actuator is coupled directly to the platform and upper boom. Movement of the lower boom relative to the base causes the first rotary actuator to displace a fixed amount of hydraulic fluid, and movement of the upper boom relative to the lower boom caused the second rotary actuator to disperse a fixed amount of hydraulic fluid.