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Japanese Patent JP5284998

B2

A hand held motor driven electrically powered tool, in particular a rotary hammer, comprising a spindle (40) for rotatingly driving a tool or bit (68), a spindle rotary drive train (14, 5, 10) for rotatingly driving the spindle (40) and an arrangement for detecting blocking events (16, 17). Blocking events occur when the tool or bit of the tool become rotationally fixed in the material being bored in which case the rotary drive on the spindle from the motor causes the tool housing to rotate in a user's grip. According to a first aspect of the invention an overload clutch (14) is provided in the spindle rotary drive train for transmitting rotary drive to the spindle below a predetermined torque and slipping above the predetermined torque arranged such that the overload clutch cuts off rotary drive to the spindle, for example by reducing the predetermined torque at which the overload clutch (14) slips when a blocking event is detected so as to cut off rotary drive to the spindle in response to a blocking event being detected. According to a second aspect of the invention there is provided a mode change mechanism (45, 47, 49, 43) for selectively disengaging a clutch (10, 7) so as to cut off the rotary drive to the spindle (40) and the clutch is disengaged when a blocking event is detected so as to cut off rotary drive to the spindle in response to a blocking event being detected.

Stille, Michael
Reuterwald, Martin
Gensmann, Stephans Day.
Hahn, Norbert
Usselman, Robert Alan
Yunk, Ahim
Bradas, robert

JP2010033685A

September 11, 2013

February 18, 2010

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BLACK & DECKER INC.

B23B45/16; B25D16/00; B25D17/10; B25F5/00; F16D7/10; F16D43/208

JP7037580U
JP2000263304A
JP2000202786A
JP2053578A
JP7033510U
JP2002254224A
JP61270086A

Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Shinji Mitsuhashi

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