Abstract: An improved forklift device for unloading palletized articles from the bed of a flatbed truck may be removably carried in "piggyback" fashion on the rear end of the truck. The device has a fork structure adapted to liftingly engage one of the pallets, a wheeled, ground-supportable frame, and an articulated linkage structure which interconnects the frame and the fork structure and is movable between a fully lowered and rearwardly retracted position and a fully raised and forwardly extended position. The forklife may be propelled along the ground by an engine-driven hydraulic drive system, and is also provided with a hydraulic actuating system for pivoting gantry and boom portions of the linkage, and pivoting the fork structure relative to the linkage. In unloading the articles the fork structure may be moved a substantial distance laterally across the truck bed to liftingly engage the pallet of an article on the far side of the bed.

Abstract: An improved high pressure fluid delivery system has a hollow fluid delivery shaft connected at its discharge end to a spray delivery assembly and rotationally driven relative to a hollow housing which internally supports the shaft. The discharge end of a high pressure fluid inlet adapter fitting and the inlet end of the shaft are sealingly interconnected within a seal cartridge removably carried by the housing in a readily accessible location, the inlet fitting and the seal cartridge being clamped to the housing by a cap member threaded onto the housing. High pressure fluid leakage past the seal cartridge into the housing is vented in a manner preventing significant internal fluid pressurization of the housing, thereby permitting it to be formed from a relatively lightweight material such as aluminum. High pressure fluid leakage past the seal cartridge toward the cap member is vented outwardly through a plurality of vent openings formed in the cap member.