Pneumatically operable lifting appliance

摘要

The invention relates to a pneumatically operable lifting appliance consisting of a cylindrical housing and a block-and-tackle arranged centrally in the housing and having two pulley blocks, of which one is firmly ... in a housing centre part and the other ... in a ... in the axial direction of the housing ... forms the cylinder of a piston/cylinder unit, and the frame is connected via two piston rods to the piston of the piston/cylinder unit. In order to prevent the load hook from shooting up if there is a sudden load drop, at least one brake cylinder is provided which is coupled to the piston and either triggers a mechanical brake by the dynamic pressure arising in it if there is a sudden load drop and/or can be acted upon automatically with compressed air by a control valve in order to brake the piston or amplify the force of the mechanical brake.