Pneumatic tool

Claim 1

IN A POWER OPERATED TOOL FOR CRIMPING A WORKPIECE, A CRIMPING MECHANISM INCLUDING CRIMPING DIES AND A ROTATABLY DISPLACEABLE OPERATING MEMBER FOR EFFECTING CRIMPING DIE ADVANCE IN ACCORDANCE WITH THE DEGREE OF ROTATIVE DISPLACEMENT THEREOF, A CYLINDER, A LINEALLY DISPLACEABLE PISTON ROD MOUNTED IN SAID CYLINDER AND CONNECTED TO SAID OPERATING MEMBER TO ROTATABLY DISPLACE SAID OPERATING MEMBER IN ACCORDANCE WITH THE DEGREE OF LINEAL PISTON ROD ADVANCE, AN ADJUSTABLY POSITIONABLE STOP MEMBER POSITIONED IN THE PATH OF PISTON ROD ADVANCE TO LIMIT THE DEGREE OF ADVANCE THEREOF BY ENGAGEMENT THEREWITH, A VALVE ASSEMBLY FOR CONTROLLING THE ADMITTANCE OF IMPELLING FLUID INTO SAID CYLINDER TO EFFECT ADVANCE OF SAID PISTON ROD MEMBER, A PIVOTALLY DISPLACEABLE CONTROL LEVER FOR CONTROLLING ACTUATION OF SAID VALVE ASSEMBLY, PIVOTALLY MOUNTED RETENTION MEANS ENGAGEABLE WITH SAID CONTROL LEVER TO PREVENT RETURN DISPLACEMENT THEREOF SUBSEQUENT TO INITIATION OF VALVE ASSEMBLY OPENING AND TRIGGER MEANS PIVOTALLY MOUNTED ON SAID PISTON ROD AND DISPLACEABLE IN RESPONSE TO ENGAGEMENT WITH SAID STOP MEMBER FOR SELECTIVELY DISENGAGING SAID RETENTION MEANS FROM SAID CONTROL LEVER TO PERMIT DEACTUATION OF SAID CYLINDER SUBSTANTIALLY SIMULTANEOUS WITH THE CESSATION OF PISTON ROD ADVANCE.