US3326545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensator devices for improving the extension characteristics of coil extension springs
Assignee: George Salter and Co Ltd
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Filing: 1965-07-12
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Granted: 1967-06-20
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Expires: 1985-07-12
Abstract
No abstract record available.
Inventors
- 👤 John K Bache
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:02
CPC Classifications
G; G01; G01G; G01G3/00; G01G3/02; B; B60; B60G; B60G17/00; F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/12; F16F1/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A COMPENSATOR DEVICE FOR IMPROVING THE EXTENSION CHARACTERISTICS OF A HELICAL COIL EXTENSION SPRING, SAID DEVICE CONSISTING OF MEMBER HAVING A PART WHICH LIES ALONG A HELICAL PATH AND WHICH ENGAGES AND FITS BETWEEN ADACENT COIL TURNS OF THE SPRING TO BE COMPENSATED, WITH LOCALISED DEFORMATION OF THE LATTER, WHEREBY A PREDETERMINED DEGREE OF EXTRA STIFFENING IS INTRODUCED ARTIFICALLY INTO THE UNEXTENDED SPRING BY REDUCTION IN ITS EFFECTIVE LENGTH, THE THICKNESS OF SAID COIL-ENGAGING PART DIMINISHING TOWARDS AT LEAST ONE END, PROVIDING A PROFILE OF SUCH FORM THAT THE LENGTH OF THE COIL TURNS IN ENGAGEMENT THEREWITH DECREASES PROGRESSIVELY AS THE SPRING IS EXTENDED UNDER LOAD WHEREBY THE DEGREE OF EXTRA STIFFENING INTRODUCED ALSO DECREASES PROGRESSIVELY AND COMPENSATES FOR THE PROGRESSIVE INCREASE IN NATURAL STIFFENING OF THE SPRING WHICH IS CAUSED BY THE PROGRESSIVE INCREASE IN PITCH ANGLE OF THE COIL TURNS DURING EXTENSION.
Claim 2
Dependent Claim
144 words
A COMPENSATOR DEVICE FOR IMPROVING THE EXTENSION CHARACTERISTICS OF A HELICAL COIL EXTENSION SPRING, SAID DEVICE CONSISTING OF MEMBER HAVING A PART WHICH LIES ALONG A HELICAL PATH AND WHICH ENGAGES AND FITS BETWEEN ADACENT COIL TURNS OF THE SPRING TO BE COMPENSATED, WITH LOCALISED DEFORMATION OF THE LATTER, WHEREBY A PREDETERMINED DEGREE OF EXTRA STIFFENING IS INTRODUCED ARTIFICALLY INTO THE UNEXTENDED SPRING BY REDUCTION IN ITS EFFECTIVE LENGTH, THE THICKNESS OF SAID COIL-ENGAGING PART DIMINISHING TOWARDS AT LEAST ONE END, PROVIDING A PROFILE OF SUCH FORM THAT THE LENGTH OF THE COIL TURNS IN ENGAGEMENT THEREWITH DECREASES PROGRESSIVELY AS THE SPRING IS EXTENDED UNDER LOAD WHEREBY THE DEGREE OF EXTRA STIFFENING INTRODUCED ALSO DECREASES PROGRESSIVELY AND COMPENSATES FOR THE PROGRESSIVE INCREASE IN NATURAL STIFFENING OF THE SPRING WHICH IS CAUSED BY THE PROGRESSIVE INCREASE IN PITCH ANGLE OF THE COIL TURNS DURING EXTENSION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |