US3751025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conical spring
Assignee: Unisys Corp
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Filing: 1971-11-01
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Granted: 1973-08-07
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Expires: 1991-11-01
Abstract
Abstract A conical spring is provided wherein the diameters of the coils thereof vary progressively, and the spaces separating adjacent coils vary in relation to the dimensions of the coils to provide predetermined force-displacement spring characteristics.
Inventors
- 👤 J Beery
- 👤 Z Luo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:20
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
172 words
A conical spring having a series of mutually adjacent, coaxially disposed, resilient coils of progressively varying diameters, said spring providing predetermined restoring force characteristics relative to applied displacement forces as determined by the physical dimensions and disposition of said coils and by the characteristics of the materials forming said coils, said predetermined restoring force characteristics relative to said applied displacement forces being derived from the formation and disposition of said coils according to the equation Bx 8LK/dG (Cx- 1)3AND Cx Di/d + (Df- Di)/dL x, BX representing the variable coil pitch, K representing the bulk modulus of elasticity of the spring material, G representing the modulus of elasticity in shear of the spring material, L representing the active free end of the spring material, CX representing a variable spring index, d representing the diameter of the spring material, Di representing the smallest outside diameter of the spring, Df representing the largest outside diameter of the spring, and x representing a variable of length designating longitudinal position along the axis of the spring.
Claim 2
Dependent Claim
172 words
A conical spring having a series of mutually adjacent, coaxially disposed, resilient coils of progressively varying diameters, said spring providing predetermined restoring force characteristics relative to applied displacement forces as determined by the physical dimensions and disposition of said coils and by the characteristics of the materials forming said coils, said predetermined restoring force characteristics relative to said applied displacement forces being derived from the formation and disposition of said coils according to the equation Bx 8LK/dG (Cx- 1)3AND Cx Di/d + (Df- Di)/dL x, BX representing the variable coil pitch, K representing the bulk modulus of elasticity of the spring material, G representing the modulus of elasticity in shear of the spring material, L representing the active free end of the spring material, CX representing a variable spring index, d representing the diameter of the spring material, Di representing the smallest outside diameter of the spring, Df representing the largest outside diameter of the spring, and x representing a variable of length designating longitudinal position along the axis of the spring.
Claim 3
Dependent Claim
42 words
The conical spring as defined by claim 1 wherein said predetermined restoring force characteristics relative to applied displacement forces as determined by the physical dimensions and disposition of said coils are derived by the formation of said coils according to the equation
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |