Grease coupler

A grease coupler, comprising:

• an outer sleeve axially movable on an inner sleeve, each of which has an inlet end and an outlet end;
• a connection body connected to the inlet end of the inner sleeve;
• a collar axially movable on the outer sleeve between the connection body and the inlet end of the outer sleeve;
• a collar spring on the inlet end of the inner sleeve between the collar and the connection body to axially bias the collar toward the outlet end of the outer sleeve;
• jaws axially and radially movable in the outlet end of the outer sleeve to lock and unlock with a grease nipple;
• a nozzle axially movable in the outlet end of the inner sleeve between the jaws and the outlet end of the inner sleeve;
• a nozzle spring in the inner sleeve between the nozzle and the connection body;
• a collar ball groove in the collar and a corresponding inner ball groove in the inner sleeve;
• sleeve locking balls axially and radially movable between the collar ball groove and the inner ball groove via ball holes in the outer sleeve;
• a nozzle ball groove in the nozzle;
• and
• nozzle locking balls in the outlet end of the inner sleeve and axially movable within a limited axial distance defined by the nozzle ball groove;
• wherein a first retraction of the collar axially away from the outlet end of the outer sleeve pre-arms the grease coupler for coupling to the grease nipple by axially and radially moving the sleeve locking balls from the collar ball groove to the inner ball groove to lock the outer sleeve and the inner sleeve to one another to thereby permit relative axial movement between the outer sleeve and the nozzle to lock the jaws;
• wherein pushing the grease nipple inside the outlet end of the outer sleeve initially moves the nozzle axially away from the jaws to unlock the jaws and compress the nozzle spring, and subsequently moves the nozzle axially toward the grease nipple under spring pressure by the nozzle spring to thereby relock the jaws and positively couple the nozzle to the grease nipple;
• and
• wherein a second retraction of the collar axially away from the outlet end of the outer sleeve moves the sleeve locking balls from the inner ball groove to the collar ball groove to unlock the outer sleeve and the inner sleeve from one another to thereby permit relative axial movement between the outer sleeve and the nozzle to thereby unlock the jaws from the grease nipple, while relative axial movement between the nozzle and the inner sleeve is limited by axial movement of the nozzle locking balls within the limited axial distance defined by the nozzle ball groove to thereby positively uncouple the nozzle from the grease nipple.