US4064948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power wrench
Assignee: Atlas Copco AB
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Filing: 1976-03-15
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Granted: 1977-12-27
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Expires: 1996-03-15
Abstract
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.
Inventors
- 👤 Bratt
- 👤 Carl Ake Moberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:13
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/145
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
191 words
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.
Claim 2
Dependent Claim
191 words
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.
Claim 3
Dependent Claim
96 words
A power wrench according to claim 1, wherein said cam means (57,58) comprises at least one tooth (57,58) with sloping faces connected to each of said halves of said release clutch, and wherein between the at least one tooth connected to one of said release clutch halves and the at least one tooth connected to the other of said release clutch halves there is a gap the width of which substantially corresponds to the relative angular displacement of the clutch halves that arises at increasing load on said release clutch (16,17) from zero to release level.
Claim 4
Dependent Claim
63 words
A power wrench according to claim 2, in which said release clutch (16,17) is a magnetic field type clutch, and comprising a cam sleeve (56) which is axially displaceable relative to said one of said release clutch halves upon interengagement of said cam teeth (57,58) for supporting said at least one cam tooth connected to said one of said release clutch halves (17).
Claim 5
Dependent Claim
66 words
A power wrench according to claim 3, wherein said torque non-responsive clutch (70) includes two halves, one of the halves (72) of said torque non-responsive clutch (72) being axially displaceable between an active position and an inactive position, and wherein said maneuver means (75) is arranged to transmit axial movement from said cam sleeve (56) to said one half (72) of said torque non-responsive clutch (70).
Claim 6
Dependent Claim
44 words
A power wrench according to claim 4, wherein said cam means (57,58) and said torque non-responsive clutch (70) are coaxially located, and wherein said maneuver means (75) comprises a push rod coaxially extending between said cam means (57,58) and said torque non-responsive clutch (70).
Claim 7
Dependent Claim
51 words
A power wrench according to claim 5, wherein said motor (14) is a pressure fluid motor having an inlet valve (60), said inlet valve (60) being coupled to said cam sleeve (56) so as to be shifted from an open position to a closed position as said cam teeth (57,58) interengage.
Claim 8
Dependent Claim
165 words
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.
Claim 9
Dependent Claim
165 words
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |