US3703933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact wrench with torque control means
Assignee: Atlas Copco AB
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Filing: 1971-04-13
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Granted: 1972-11-28
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Expires: 1991-04-13
Abstract
Abstract In an impact wrench provided with torque control means, a cutoff for the wrench drive motor is activated at attainment in an adding mechanism of a predetermined sum total of the lengths of displacement of a body which in response to rotational resistance at each impact is displaced against the action of a return force.
Inventors
- 👤 Knut Christian Schoeps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:24
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/145; B25B23/1453
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
An impact wrench with torque control means comprising a housing, a drive motor in said housing, cut-off means for said motor in said housing, a drive shaft in said motor, an anvil rotatably journalled in said housing and adapted to be connected to a workpiece, a rotary impact motor in said housing operatively interconnected between said drive shaft and said anvil for applying a succession of rotational impacts against said anvil and thereby to said workpiece, a body in said housing operatively associated with said drive shaft for being displaced at each impact relative thereto in response to rotational resistance of said anvil, means for producing a return force active against said body to cancel the displacements thereof, an adding mechanism in said housing for adding the lengths of displacement of said body, and means in said housing associated with said adding mechanism for activating said cut-off means at attainment in said adding mechanism of a predetermined sum total of said lengths of displacement.
Claim 2
Dependent Claim
164 words
An impact wrench with torque control means comprising a housing, a drive motor in said housing, cut-off means for said motor in said housing, a drive shaft in said motor, an anvil rotatably journalled in said housing and adapted to be connected to a workpiece, a rotary impact motor in said housing operatively interconnected between said drive shaft and said anvil for applying a succession of rotational impacts against said anvil and thereby to said workpiece, a body in said housing operatively associated with said drive shaft for being displaced at each impact relative thereto in response to rotational resistance of said anvil, means for producing a return force active against said body to cancel the displacements thereof, an adding mechanism in said housing for adding the lengths of displacement of said body, and means in said housing associated with said adding mechanism for activating said cut-off means at attainment in said adding mechanism of a predetermined sum total of said lengths of displacement.
Claim 3
Dependent Claim
97 words
An impact wrench according to claim 1 in which said body is an inertial body axially displaceably mounted on said drive shaft, axial cam means between said drive shaft and said body for rotating the latter conjointly with said drive shaft and for displacing said body at retardation of said shaft by way of inertia axially of said shaft, said adding mechanism including an adding shaft, a driving member between said body and said adding shaft, and means for transforming the axial displacements of said body and driving member into uni-directional turning movement of said adding shaft.
Claim 4
Dependent Claim
36 words
An impact wrench according to claim 2 in which said transforming means include a pair of free-wheel-mechanisms, one between said driving member and said adding shaft and the other between said adding shaft and said housing.
Claim 5
Dependent Claim
101 words
An impact wrench according to claim 2 in which said activating means comprises a setting drum rotatably mounted in said housing, a base portion on said setting drum, means for adjusting and affixing saiD base portion angularly with respect to said housing, a drum portion on said setting drum connectable to said adding shaft for being turned thereby relative to said base portion, spring means interposed between said base and drum portions for counteracting such turning movement of said drum portion, and a member on said drum portion for activating said cut-off means upon appropriate turning movement of said drum portion.
Claim 6
Dependent Claim
53 words
An impact wrench according to claim 4 in which a clutch is provided for connecting said drum portion to said adding shaft, and means for disengaging said clutch at activation of said cut-off means to permit resetting of said drum portion relative to said base portion under the action of said spring means.
Claim 7
Dependent Claim
39 words
An impact wrench according to claim 5 in which there are provided manually actuatable starting means in said housing for said motor, and means in said housing for engaging said clutch in response to actuation of said starting means.
Claim 8
Dependent Claim
97 words
An impact wrench according to claim 4 in which said motor is actuated pneumatically, a passage in said housing for supplying compressed air to said motor, said cut-off means being a normally open cut-off valve in said passage, means for biasing said valve to the cut-off portion thereof, a locking arm pivotally mounted in said housing and cooperating with said cut-off valve to releasably arrest said cut-off valve in the open position thereof, and said member on said drum portion cooperating with said locking arm for releasing movement of said cut-off valve to the cut-off position thereof.
Claim 9
Dependent Claim
59 words
An impact wrench according to claim 6 in which said motor is actuated pneumatically, a passage in said housing for supplying compressed air to said motor, a throttle valve in said passage providing said starting means, and said clutch engaging means being a pneumatically actuated servo piston means controlled by said throttle valve and operatively connected to said clutch.
Claim 10
Dependent Claim
25 words
An impact wrench according to claim 2 in which said turning movement of said adding shaft is arranged to be generated by said return force.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |