Pneumatic cylinder utilizing cushioning sleeves, quick exhaust valves and quick supply valves

摘要

A pneumatic cylinder includes a cushioning device having a first cushioning sleeve gradually decreasingly communicating a first cushioning chamber with a first passage formed on a first cap and connected to a first fluid flowing ports as the first cushioning sleeve is gradually inserted into the first passage; a second cushioning sleeve gradually decreasingly communicating a second cushioning chamber with a second passage formed on the second caps and connected to the second fluid flowing ports as the second cushioning sleeve is gradually inserted into the second passage; a first quick fluid exhaust valve which is mounted on the first cap and is selectively opened by pushing force of the piston to communicate the first cushioning chamber with the first passage; a second quick fluid exhaust valve which is mounted on the second cap and is selectively opened by pushing force of the piston to communicate the second cushioning chamber with the second passages; a first quick fluid supply valve which is mounted on the first cap and is selectively opened as pressurized pressure flows into the first chamber to rapidly supply fluid to the second cushioning chamber; and a second quick fluid supply valve which is mounted on the second cap and is selectively opened as pressurized pressure flows into the second chambers to rapidly supply fluid to the first cushioning chamber.