Abstract: A drive system for a vertical mast personnel lift uses a pair of rear wheels that are fixed in an axial direction of a base portion of the personnel lift. When an operator input to make a turn is received, DC motors respectively connected to the right and left rear wheels are rotated at a different rate. Neither the front wheels nor the rear wheels are steered during the turning movement. The front wheels are configured as caster wheels, which are free to turn in any direction. In order to rotate the personnel lift about its central axis, the right rear wheel is rotated at a first rate in a first direction, and the left rear wheel is rotated at the first rate in a second direction opposite the first direction.

Abstract: A forklift is supported for movement by a pair of elongated wheeled members. The wheeled members are shiftable towards and away from one another to permit the handling of different types of loads. Each of the wheeled members has a rear wheel in the form of a caster as well as two front wheels. The front wheels of a wheeled member can be lowered and raised in such a manner that one of the front wheels is lifted from the ground as the other front wheel is moved down into contact with the ground. A first front wheel of each wheeled member is arranged to roll forwards and backwards while the second front wheel rolls sideways. During the transportation of loads from one location to another, the first front wheels are in contact with the ground. When the wheeled members are to be moved towards or away from one another, the second front wheels are brought into contact with the ground.

Abstract: A load transport lifter having the following characteristics: a lift platform with a moveable base frame connected to a cylinder mechanism and struts; upper sprockets are attached to the end of the piston rod of the cylinder mechanism and lower sprockets are attached to a lift mechanism disposed along the struts; a cable or chain, one end of which is fixed to the lift platform, is wound around the upper and lower sprockets and is fixed at the other end to the top of the struts; further, coil springs are attached to the lift mechanism and adapted to push it downward; finally, a locking mechanism is adapted to lock the lift mechanism in a set position.