US4111407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conical compression spring
Assignee: CONTROMATICS ACQUISITION Inc A Corp OF
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Filing: 1976-09-30
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Granted: 1978-09-05
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Expires: 1996-09-30
Abstract
Abstract A conical compression spring having the characteristics of a cylindrical spring of much greater free length. The spring is characterized by wire whose diameter diminishes from base to apex end and by coils whose pitch diminishes from base to apex end such that the ratio of mean coil diameter to wire diameter is constant from coil to coil. Further, each coil diameter is preferably dimensioned to fit within the next larger coil permitting a spring to be designed which exhibits a small solid compressed height.
Inventors
- 👤 Francis W. Stager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:13
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A spring exhibiting uniform stress and constant spring rate comprising: a wire helically wound into a conical form to comprise a plurality of spring coils, said wire having a diameter d which diminishes from one end to the other, and each said coil having a mean diameter Dm which diminishes from one end of the form to the other, the largest wire cross-sectional area comprising the base end of the spring, and the pitch of the spring coils diminishing from one end of said form to the other, whereby the ratio Dm/d is the same from coil to coil throughout the form thereby to provide a spring wherein each coil has the same stress limit.
Claim 2
Dependent Claim
115 words
A spring exhibiting uniform stress and constant spring rate comprising: a wire helically wound into a conical form to comprise a plurality of spring coils, said wire having a diameter d which diminishes from one end to the other, and each said coil having a mean diameter Dm which diminishes from one end of the form to the other, the largest wire cross-sectional area comprising the base end of the spring, and the pitch of the spring coils diminishing from one end of said form to the other, whereby the ratio Dm/d is the same from coil to coil throughout the form thereby to provide a spring wherein each coil has the same stress limit.
Claim 3
Independent Claim
52 words
A method of making conical compression springs having a linear spring constant comprising the steps of forming a wire tapering from end to end, and helically winding said wire into a conical shape while maintaining the ratio of mean coil diameter to wire diameter of each coil constant from coil to coil.
Claim 4
Independent Claim
52 words
A method of making conical compression springs having a linear spring constant comprising the steps of forming a wire tapering from end to end, and helically winding said wire into a conical shape while maintaining the ratio of mean coil diameter to wire diameter of each coil constant from coil to coil.
Claim 5
Dependent Claim
23 words
The method of claim 2 further comprising the steps of uniformly heating said spring, and differentially quenching said spring from end to end.
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |