Patent US4301462A successfully refreshed from Google Patents.
US3599515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam means for torque wrenches
Assignee: Individual
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Filing: 1969-10-03
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Granted: 1971-08-17
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Expires: 1989-10-03
Abstract
Abstract A self-centering cam means for use in torque wrenches comprising axially spaced, normally aligned, axially inwardly opening and opposing truncated conical recesses in spaced, normally opposing ends of a laterally shiftable spring-loaded plunger, and an elongate normally axially extending cam block between the arm and plunger, with flat opposite ends normally establishing flat seated engagement on the bottoms of the recesses, flat, laterally outwardly disposed longitudinal sides on planes normal to the pivotal axis of the arm and converging with the ends to define straight pivot edges extending along cord lines across the bottoms of the recesses and radially outwardly disposed longitudinally extending convex intermediate sides, the ends of which define arcuate edges, the radiuses of which are equal with the radiuses of bottoms of the recesses and which normally engage in the corners established by the bottoms and side of the recesses.
Inventors
- 👤 Bosko Grabovac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:56
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/142; B25B23/1422; B25B23/1427
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
252 words
An improved cam means for torque wrenches engageable between the laterally shiftable free rear end of an elongate pivoted cam arm and the forward end of an axially shiftable plunger normally in axial alignment with the arm and normally in axial alignment with the arm and normally yieldingly urged forwardly toward the arm by spring means, said cam means including rearwardly and forwardly opening frustoconical recesses in the rear and in the front ends of the arm and plunger and defining flat, axially disposed bottom surfaces, radially and axially outwardly inclined sides and annular inside corners where said bottom surfaces and sides converge an elongate cam block normally in axial alignment with the arm and plunger and having flat axially disposed ends normally establishing flat bearing engagement on the bottom surfaces, flat diametrically opposite, laterally outwardly disposed, longitudinal primary sides converging with the said ends to define straight, parallel, laterally spaced pivot edges at the ends of the block on cord lines across the bottom surfaces; convex diametrically opposite radially outwardly disposed, longitudinal secondary sides between the primary sides and converging with the ends to define arcuate outside corner edges substantially equal in radius with the radius of the inside corners in the recesses and normally cooperatively seated therein, said block adapted to pivot out of axial alignment with the plunger and the arm when the rear end of the arm is urged laterally and out of alignment with the plunger, said pivot edges establishing lineal bearing engagement on the bottom surfaces.
Claim 2
Dependent Claim
252 words
An improved cam means for torque wrenches engageable between the laterally shiftable free rear end of an elongate pivoted cam arm and the forward end of an axially shiftable plunger normally in axial alignment with the arm and normally in axial alignment with the arm and normally yieldingly urged forwardly toward the arm by spring means, said cam means including rearwardly and forwardly opening frustoconical recesses in the rear and in the front ends of the arm and plunger and defining flat, axially disposed bottom surfaces, radially and axially outwardly inclined sides and annular inside corners where said bottom surfaces and sides converge an elongate cam block normally in axial alignment with the arm and plunger and having flat axially disposed ends normally establishing flat bearing engagement on the bottom surfaces, flat diametrically opposite, laterally outwardly disposed, longitudinal primary sides converging with the said ends to define straight, parallel, laterally spaced pivot edges at the ends of the block on cord lines across the bottom surfaces; convex diametrically opposite radially outwardly disposed, longitudinal secondary sides between the primary sides and converging with the ends to define arcuate outside corner edges substantially equal in radius with the radius of the inside corners in the recesses and normally cooperatively seated therein, said block adapted to pivot out of axial alignment with the plunger and the arm when the rear end of the arm is urged laterally and out of alignment with the plunger, said pivot edges establishing lineal bearing engagement on the bottom surfaces.
Claim 3
Dependent Claim
55 words
A structure as set forth in claim 1 wherein the end corners established by the adjacent converging ends of the pivot edges and outside corner edges establish stopped pivotal engagement in the inside corners of the recesses and prevent lateral shifting and displacement of the block when it is pivoted between the arm and plunger.
Claim 4
Dependent Claim
66 words
A structure as set forth in claim 2 wherein the lateral spacing of the primary sides of the block are spaced from the central axis of the block are spaced from the central axis of the block and relative to each other to establish the desired lateral extent and stability of the block to resist lateral shifting of the arm and resulting pivoting of the block.
Claim 5
Dependent Claim
58 words
A structure as set forth in claim 2 wherein the longitudinal spacing of the ends and the lateral spacing of the primary sides and the resulting effective axial and lateral extent of the block are selectively alterable to establish the desired stability of the block to resist lateral shifting of the arm and resulting pivoting of the block.
Claim 6
Dependent Claim
57 words
A structure as set forth in claim 1, wherein the lateral spacing of the primary sides of the block are spaced from the central axis of the block and relative to each other to establish the desired lateral extent and stability of the block to resist lateral shifting of the arm and resulting pivoting of the block.
Claim 7
Dependent Claim
58 words
A structure as set forth in claim 1 wherein the longitudinal spacing of the ends and the lateral spacing of the primary sides and the resulting effective axial and lateral extent of the block are selectively alterable to establish the desired stability of the block to resist lateral shifting of the arm and resulting pivoting of the block.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |