Patent US3832916A successfully refreshed from Google Patents.
US3832916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact wrench
Assignee: Atlas Copco AB
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Filing: 1973-01-24
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Granted: 1974-09-03
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Expires: 1993-01-24
Abstract
Abstract A rotary impact wrench transmits its impacts through a torsion unit with variable spring characteristics. The torsion unit comprises a torsion bar that is inserted into a sleeve with a selectively variable part of its length protruding from the sleeve.
Inventors
- 👤 K Schoeps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:04
CPC Classifications
B; B25; B25B; B25B21/00; B25B21/02; B25B23/00; B25B23/0007; B25B23/0021
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
An impact wrench comprising: an anvil, a power rotated hammer adapted to apply rotary impacts to the anvil, and a torsion unit coupled to said anvil for transmitting from said anvil said rotary impacts as intermittent torque to a nut or the like, said torsion unit comprising: a torsion bar and a sleeve, said sleeve slidably receiving said torsion bar therein from one end with said torsion bar being non-rotatable relative to said sleeve, said one end forming with said torsion bar a torque transmitting joint, and means for axially interlocking said torsion bar and said sleeve with a selectively variable part of the length of said bar protruding from said joint, the torque transmission characteristics of said torsion unit being a function of the degree of protrusion of said torsion bar from said joint.
Claim 2
Dependent Claim
135 words
An impact wrench comprising: an anvil, a power rotated hammer adapted to apply rotary impacts to the anvil, and a torsion unit coupled to said anvil for transmitting from said anvil said rotary impacts as intermittent torque to a nut or the like, said torsion unit comprising: a torsion bar and a sleeve, said sleeve slidably receiving said torsion bar therein from one end with said torsion bar being non-rotatable relative to said sleeve, said one end forming with said torsion bar a torque transmitting joint, and means for axially interlocking said torsion bar and said sleeve with a selectively variable part of the length of said bar protruding from said joint, the torque transmission characteristics of said torsion unit being a function of the degree of protrusion of said torsion bar from said joint.
Claim 3
Dependent Claim
27 words
A wrench according to claim 1 in which said sleeve is affixed to said anvil, and said torsion bar has a free end protruding from said sleeve.
Claim 4
Dependent Claim
23 words
A wrench according to claim 1 in which said torsion bar is affixed to said anvil, and said sleeve has a free end.
Claim 5
Dependent Claim
22 words
A wrench according to claim 3 in which the free end of said sleeve is formed as a socket for a nut.
Claim 6
Dependent Claim
55 words
A wrench according to claim 1 in which said torsion bar has a generally circular cross section and is provided with a number of axial splines, and said sleeve has a number of axial splines which register with said axial splines in said torsion bar to prevent relative rotation of said torsion bar and sleeve.
Claim 7
Dependent Claim
43 words
A wrench according to claim 1 in which said axially interlocking means includes recesses formed in said sleeve and said torsion bar, said recesses being adapted to receive a locking element therein so as to axially interlock said sleeve and said torsion bar.
Claim 8
Dependent Claim
44 words
A wrench according to claim 6 in which said recesses are radial holes in said sleeve and said torsion bar, and said locking element comprises a locking pin adapted to be radially inserted in said radial holes in said sleeve and said torsion bar.
Claim 9
Dependent Claim
16 words
A wrench according to claim 5 in which said splines of said sleeve are through splines.
Claim 10
Dependent Claim
25 words
A wrench according to claim 6 in which said torsion bar has a single recess and said sleeve has a plurality of axially spaced recesses.
Claim 11
Dependent Claim
55 words
A wrench according to claim 1 in which said torsion bar has a recess at the end thereof that is disposed inside said sleeve, and said axially interlocking means includes means for engAging with said recess in said torsion bar to axially lock said torsion bar in said sleeve in selectively variable axial positions therebetween.
Claim 12
Dependent Claim
27 words
A wrench according to claim 2 wherein said free end of said torsion bar includes means for coupling said rotary impacts to said nut or the like.
Claim 13
Dependent Claim
20 words
A wrench according to claim 6 in which a clearance is provided between said locking pin and said radial holes.
Claim 14
Dependent Claim
55 words
A wrench according to claim 12 in which said torsion bar has a generally circular cross section and is provided with a number of axial splines, and said sleeve has a number of axial splines which register with said axial splines in said torsion bar to prevent relative rotation of said torsion bar and sleeve.
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |