Grease pressure release gun

摘要

A tool (10) for visually detecting and releasing grease overpressure from a grease nipple, has a grease coupling (11) that includes a vent opening (40) and is carried by a tube (12) which extends from an insert (13) within a pistol grip (14). A rod or piston (60), which extends within the tube (12) from a position in which its front end (61) covers the vent opening (40), is displaced rearwardly by the overpressure to uncover the vent opening (40) for release of grease from the nipple. The displacement of the piston (60) acts via a bolt (30) within the insert (13) to move an indicator button (15) carried by the bolt (30) to signal the existence of the overpressure.