Abstract: An apparatus and method in a positive feed tool for automatically causing a spindle of the tool to stop retracting. The tool includes a device that automatically moves a movable member away from a differential feed gear when the spindle is retracting, which causes the spindle to stop retracting.

Abstract: An apparatus and method for limiting the transmission of power from a motor to a spindle of a positive feed drill when a high torque situation develops, as well as an apparatus and method for causing the spindle to automatically retract when the high torque situation develops.

Abstract: A positive feed tool having a retract valve. The retract valve is manually actuatable so as to cause an advancing spindle of the tool to retract away from a workpiece. The retract valve is configured to automatically return its unactuated position after the retract valve is manually actuated so as to cause the spindle to once again advance toward the workpiece.

Abstract: An assembly for reversing a fluid driven motor. The assembly includes a fluid driven motor, and a reversing valve that reverses inlet and exhaust porting to and from the fluid driven motor. An actuation device opens an actuation valve and a fluid supply valve. The actuation valve causes the reversing valve to reverse the inlet and exhaust porting to and from the fluid driven motor when the actuation device opens the actuation valve. The fluid supply valve allows fluid to flow through the fluid supply valve to the motor when the actuation device opens the fluid supply valve. The fluid supply valve also prevents fluid flow through the fluid supply valve to the fluid driven motor when the fluid supply valve is closed.

Abstract: A variable-speed, multiple-drive, power tool (10) is driven by first motor (18) having a first longitudinal axis (32) and second motor (20) having a second longitudinal axis (100). Second motor (20) drives ring gear (52) of first planetary gear set (48) while first motor (18) drives pinion (36). First end (40) of pinion (36) serves as sun gear (46) for first planetary gear set (48). First planetary gear set (48) drives intermediate spindle (76). Intermediate spindle (76) in turn drives second planetary gear set (82). Second planetary gear set (82) drives output spindle (22) through gear element (90).

Abstract: A gear shifting power tool (10) includes a rotatably-driven, torque-responsive, gear shift device (30). Rotatably-driven, torque-responsive, gear shift device (30) may include drive spindle (38), plunger (54) positioned within drive spindle (38). Drive spindle (38) has first hole pair (44) and second hole pair (46) in which first ball pair (48) and second ball pair (50) contact plunger (54). Drive clutch member (32) is drivably engaged to drive spindle (38) through ball screw arrangement (64). Drive clutch member (32) disengages from driven clutch member (34) in response to a resistive torque overcoming torque spring (40). Inertial device (62) forces first ball pair (48) into one end of plunger (54) which forces plunger (54) towards reset spring (60). Plunger (54) forces second ball pair (46) into inner axial groove (36) of drive clutch member (32) and prevents drive clutch member (32) from engaging driven clutch member (34) until all rotation ceases.