Piston device connectable to compressed air or vacuum source, contains channel with entrances at end protruding from cylinder and inside cylinder itself

摘要

The end of the piston (3) protruding from the cylinder (2) contains a channel (4) extending over at least part of the piston length. A second entrance (33) to this channel is located inside the cylinder. A medium can be passed through the cylinder via a tube (6) extending between a passage in the cylinder wall (23) and the second entrance.