Abstract: A scissors lift apparatus has three scissor units for supporting heavy loads. A central scissor unit has its arms located inwardly of the immediately lower and upper scissor units, and folds into the upper and lower scissor units for storage within a chamber in a mobiled chassis. The scissor arms of the upper and lower scissor units includes rectangular box beams with a greater vertical than horizontal dimension. Hydraulic cylinders are located within and coupled to the opposite two arms of the center scissor unit to expand and collapse the same. The mobile chassis has front steering wheels mounted with hydraulic powered-caster-type wheel drive and steering apparatus. The steering king pin is laterally offset from the vertical plane through the center of wheel. A dual fail safe braking unit on the trailing wheels has an applied hydraulic cylinder unit including a floating cylinder with a single spring applied piston and rod which is supported in a fixed journal and connected to one wheel.

Abstract: An improved work platform suitable for mounting on a vehicle mounted telescoping boom. The work platform includes a fixed platform section mounted on the tip of the boom in conjunction with a leveling mechanism. Two movable side platform sections are pivotally fastened at one of their ends to the fixed platform section for independent movement on either side of a centerline. The side platform sections may be moved apart in a scissors-like motion so that the platform may be maneuvered to straddle the object being worked on. Bumpers and troughs are provided along the inner edge of the side platform sections to protect the object being worked on and to prevent articles from rolling off the platform. When the side panel sections are moved into abutment to use the platform as a conventional unitary platform, a hinged flap on one of the side platform sections covers the abutting edges of the side platform sections, the bumpers and the troughs.