Pneumatic operated welding stud holder

Claim 1

A WELDING STUD HOLDER, COMPRISING: A STUD CHUCK HAVING A PASSAGEWAY EXTENDING COMPLETELY THERETHROUGH WITH ONE END OF SAID CHUCK BEING SPLIT LONGITUDINALLY INTO A PLURALITY OF SEPARATE RESILIENT GRIP PORTIONS SO THAT WELDING STUDS INSERTED INTO SAID PASSAGEWAY ARE HELD THEREIN BY FRICTIONAL ENGAGEMENT WITH SAID GRIP PORTIONS; A CHUCK HOLDER MEMBER WITH A CAVITY THEREIN FOR THE RECEPTION OF SAID CHUCK, SAID HOLDER MEMBER BEING ATTACHED TO SAID CHUCK WITH THE GRIP PORTIONS THEREOF POSITIONED AT LEAST PARTIALLY WITHIN SAID CAVITY AND HAVING AN APERTURE EXTENDING FROM THE EXTERIOR OF SAID HOLDER MEMBER INTO SAID CAVITY; SEALING MEANS INCLUDING A TUBULAR SLEEVE OF ELASTOMER MATERIAL POSITIONED AROUND THE GRIP PORTIONS OF SAID CHUCK IN SAID CAVITY AND HAVING A PAIR OF SEALING FLANGE PORTIONS AT THE OPPOSITE ENDS THEREOF TO FORM AN AIR-TIGHT CHAMBER WITH SAID HOLDER MEMBER BETWEEN SAID HOLDER MEMBER AND SAID CHUCK, FOR MOVING SAID GRIP PORTIONS INWARD BY SUBSTANTIALLY SOLELY INWARD MOVEMENT OF SAID SLEEVE WHEN THE AIR PRESSURE WITHIN SAID CHAMBER IS INCREASED; AND MEANS FOR FORCING AIR INTO SAID CHAMBER THROUGH THE APERTURE IN SAID HOLDER MEMBER TO RAISE THE AIR PRESSURE IN SAID CHAMBER TO URGE THE RESILIENT GRIP PORTIONS OF SAID CHUCK INWARD INTO ENGAGEMENT WITH A WELDING STUD POSITIONED IN THE PASSAGEWAY OF SAID CHUCK TO PREVENT MOVEMENT OF THE STUD WITH RESPECT TO SAID CHUCK, AND FOR REMOVING AT LEAST A PORTION OF SAID AIR FROM SAID CHAMBER TO LOWER THE AIR PRESSURE IN SAID CHAMBER SO THAT SAID WELDING STUD CAN BE REMOVED FROM SAID CHUCK.