US4043546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression springs
Assignee: Case Poclain Corp Ltd
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Filing: 1976-01-09
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Granted: 1977-08-23
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Expires: 1996-01-09
Abstract
Abstract A compression spring capable of having a very high rate comprises co-axial annular plates alternating in an axial direction with diametrical strips adjacent ones of which are perpendicular to one another. The spring may comprise a stack of washers with diametrically opposed pads or radial ribs on their faces, said washers having non-circular bores enabling them to be located non-rotatably on a correspondingly non-circular central support. Alternatively, the spring may comprise a single tubular element with pairs of diametrically opposed tangential slots perpendicular to its axis which extend from its periphery into its bore.
Inventors
- 👤 Herbert Edward Ashfield
- 👤 Harry Horsfall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:33
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A compression spring comprising a support, a stack of separate coaxial washers surrounding said support and nonrotatably mounted on and along said support, each of said washers comprising an annular spring plate having a set of diametrically opposed projections on one side and another set of diametrically opposite projections on the other side, said sets being displaced at right angles, and the projections on each plate axially abutting the correspondingly oriented projections of the next adjacent plate in the stack.
Claim 2
Dependent Claim
80 words
A compression spring comprising a support, a stack of separate coaxial washers surrounding said support and nonrotatably mounted on and along said support, each of said washers comprising an annular spring plate having a set of diametrically opposed projections on one side and another set of diametrically opposite projections on the other side, said sets being displaced at right angles, and the projections on each plate axially abutting the correspondingly oriented projections of the next adjacent plate in the stack.
Claim 3
Dependent Claim
39 words
A compression spring according to claim 1, wherein said support passes through the center of the spring and has longitudinal flats, and the washers have correspondingly profiled bores to enable the washers to be mounted non-rotatably on the support.
Claim 4
Dependent Claim
23 words
The compression spring defined in claim 1, wherein each of said sets of projections comprises two diametrally opposed ribs on the plate surface.
Claim 5
Dependent Claim
23 words
The compression spring defined in claim 1, wherein each of said sets of projections comprises two diametrically opposed pads on the plate surface.
Claim 6
Dependent Claim
21 words
A signalling unit, for a draft controlled tractor power lift mechanism, including at least one compression spring according to claim 1.
Claim 7
Dependent Claim
25 words
A triple-rate signalling unit, for a draft controlled tractor power lift mechanism, including two compression springs of different rates and each according to claim 1.
References Cited (Backward Citations)
US2171185A
Cited
US2551505A
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US2744773A
Cited
FR1090004A
Cited
US3434708A
Cited
US3480268A
Cited
GB1291122A
Cited
US3831922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |