Dual mode rotary power tool with adjustable output torque

Details Dual mode rotary power tool with adjustable output torque Dual mode rotary power tool with adjustable output torque

B - Operations, Transporting

25

B

77/17, 81/23

B25B 21/00 (2006.01) B25B 23/14 (2006.01) B25B 23/147 (2006.01) B25B 23/157 (2006.01) B25F 5/00 (2006.01)

Patent

CA 2032208

ABSTRACT In an electrically powered combination screwdriver/drill opposing halves of a ratchet type torque transmitting clutch are normally biased axially apart by a compression spring. The output half of the clutch is fixed on the output spindle of the tool which is free to move axially within limits. For screwdriving operation, operator bias of the tool against the workpiece overcomes the spring, retracting the output spindle and bringing the clutch halves into engagement. An adjustable stop in the nose of the tool limits axially rearward movement of the output spindle and hence depth of engagement of the clutch teeth, thus providing a variable limit on torque transmitted. For the drilling mode, the rearward half of the clutch is cammed forward so that the clutch is firmly engaged for continuous rotation of the output spindle without specific torque limitation. An operator may switch from drilling mode to screwdriving mode and back without disturbing the torque limit adjustment of the screwdriving mode. 12079004

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