Power wrench
AssigneeAtlas Copco Aktiebolag
Inventors; Sven Ake Bratt, Carl Ake Moberg
Life of this patent
Estimating the term…
Abstract
A power wrench in which an output shaft is powered by a motor via a magnetic torque responsive release clutch, and in which a torque non-responsive clutch is connected between the release clutch and the output shaft. Cam teeth which are associated with the release clutch halves are effective to inactivate the torque non-responsive clutch as the driving and driven halves of the latter, during increased torque load, have reached their fully released position. As the release clutch is unloaded there is an angular gap between the cam teeth corresponding to the relative angular displacement arising between the release clutch halves as the load on the release clutch is increased from zero to release level.
Claims7
A power wrench comprising:
- a motor (14),
- an output shaft (12) powered by said motor (14),
- a torque responsive release clutch (16, 17) comprising a driving half (16) and a driven half (17) and being located between said motor (14) and said output shaft (12), said release clutch halves (16, 17) being angularly displaceable relative to each other between an unloaded position and a released position,
- a disengageable torque non-responsive clutch (70) located between said release clutch (16,17) and said output shaft (12),
- cam means (57,58) non-rotatably connected to the halves of said release clutch (16,17) so as to interengage upon relative rotation of said release clutch halves, and
- a maneuver means (75) operatively connecting said cam means (57,58) to said torque non-responsive clutch (70) for disengaging said torque non-responsive clutch upon interengagement of said cam means (57,58),
- said cam means (57,58) being, when said release clutch (16,17) is unloaded, interspaced a distance substantially corresponding to the relative angular displacement of said release clutch halves (16,17) between said unloaded position and said released position, whereby said cam means (57,58) remains inactive until said release clutch halves have reached said released position.
A power wrench comprising:
- a motor,
- an output shaft powered by said motor,
- a torque responsive release clutch comprising a driving half and a driven half and being located between said output shaft and said motor, said release clutch halves being angularly displaceable relative to each other between an unloaded position and a release position,
- an inactivable torque non-responsive clutch connected between said release clutch and said output shaft,
- a first cam means associated with one of the halves of said release clutch,
- a second cam means associated with the other half of said release clutch and interengagable with said first cam means upon relative angular displacement of said clutch halves,
- a maneuver means operatively connecting said first cam means to said torque non-responsive clutch,
- said first and second cam means being disposed in such an angular relationship to said release clutch so as not to interengage, and by said maneuver means inactivate said torque non-responsive clutch until said release clutch attains its released position.
Dependencies are inferred from the claim text.