Drop safety device for elevating platforms and suchlike has safety check valve installed inside piston in through-bore and acts as flow connection between opposed effective areas of piston

摘要

The drop safety device for elevating platforms and suchlike comprises a double-acting fluid cylinder (10) with a piston (20) and piston rod (22), and a safety check valve (24) installed inside the piston and acts as a flow connection between the opposed effective areas (32,34) of the piston. The flow connection is completed by a through-bore (30) in the piston and in which is installed the safety check valve. The value of the fluid flow by which the safety check valve closes is adjustable.