Abstract: A movable pedestal scaffold having two sets of wheels on the scaffold base to permit the scaffold to be rolled horizontally while the mast of the scaffold is in a vertical position. A transport frame is mounted for vertical movement on the mast, with such movement being powered by a hydraulic cylinder. A first set of wheels is mounted on the transport frame to support the scaffold at (1) a tilted position relatively near to vertical when the transport frame is close to the base member, and (2) at a tilted position substantially inclined from vertical when the transport frame is away from the base member. A second set of wheels is mounted on the transport frame closer to the mast and to the base frame then the first set of wheels on the transport frame, the first and second sets of wheels on the transport frame acting together to support the scaffold on an elevated horizontal surface as the scaffold is raise to or lowered from that surface.

Abstract: A steering and drive system for a four-wheeled vehicle (10) with two non-steering and non-driving wheels (16, 17) at one end of the vehicle, in which the system includes two wheel brackets (23, 32) at the other end of the vehicle, each wheel bracket having a motor-driven wheel (18, 19) mounted thereon, and each wheel bracket being mounted on the vehicle for turning about a vertical axis which passes through the angle of rotation of the wheel thereon, and a double-ended hydraulic cylinder (35) having a housing (36) fixed to the frame (15) of the vehicle and a reciprocating piston (41) whose ends are connected by links (47, 53) to the two wheel brackets to provide a tie between the wheels and Ackerman steering.

Abstract: A pedestal scaffold having a base member with an upwardly extending mast and a work cage mounted thereon for vertical movement. Retractable outriggers with ground-engageable pads are extendable outwardly on the cage side of the scaffold and lockable into support position to provide a large support area for the elevated work cage. Ground-engageable casters are mounted on the base and the cage and the cage is releaseably locked to the base. When the base and cage are locked together, the scaffold can be moved horizontally on the base and cage casters with the mast being vertical. When the cage is unlocked for vertical movements, scaffold weight is transferred from the cage casters to the non-rolling outrigger pads so that the scaffold cannot be moved along the ground when the cage is elevated. If the cage-side outriggers are not properly braced, the cage can be unlocked from the base but cannot be raised off the ground.