US5065988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring for compression and tension, mainly in axial direction
Assignee: Individual
•
Filing: 1987-08-11
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Granted: 1991-11-19
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Expires: 2007-08-11
Abstract
Abstract A spring for compression and tension mainly in an axial direction and made of a material having a Young's modulus of elasticity of at least 39 GPa, such as metal, steel, glass, plastic or reinforced plastic is disclosed. The spring is in the form of a tube or ring of generally constant thickness. In cross-section, each ring is made up of oppositely directed inner and outer U-shaped spring parts with contiguous axial projections. A spring is provided which has minimal elastic hysteresis.
Inventors
- 👤 Anders S. Wedell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:41
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/366; F16F1/42; F16F1/422; G; G01; G01G; G01G19/00; G01G19/14; G01G3/00; F16F2236/00; F16F2236/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
141 words
A spring for compression and tension comprising: a substantially cylindrical hollow body having a central longitudinal axis, opposite ends and a wall between said ends of substantially constant thickness and comprising at least two radially directed substantially U-shaped sections integrated to form spring parts and being symmetrical about said axis and functioning substantially in the axial direction, said U-shaped sections forming in cross-section radially outer and inner wave crests at respective inner and outer diameters, and said body being made of a material selected from the group consisting of metal, steel, glass, plastic, and reinforced plastic, and having a Young's modulus E of at least 39 GPa; and an end section at each end comprising an annular rigid axial projection extending between said inner and outer wave-crest diameters so that a neutral surface of the spring passes through said end sections.
Claim 2
Dependent Claim
141 words
A spring for compression and tension comprising: a substantially cylindrical hollow body having a central longitudinal axis, opposite ends and a wall between said ends of substantially constant thickness and comprising at least two radially directed substantially U-shaped sections integrated to form spring parts and being symmetrical about said axis and functioning substantially in the axial direction, said U-shaped sections forming in cross-section radially outer and inner wave crests at respective inner and outer diameters, and said body being made of a material selected from the group consisting of metal, steel, glass, plastic, and reinforced plastic, and having a Young's modulus E of at least 39 GPa; and an end section at each end comprising an annular rigid axial projection extending between said inner and outer wave-crest diameters so that a neutral surface of the spring passes through said end sections.
Claim 3
Dependent Claim
57 words
A spring as claimed in claim 1 wherein: said wall has an average thickness; and the ratio P=W:N for the entire length of the spring is in the range 1.5%≦P≧15%, where W is the average wall thickness and N is the diameter of said neutral surface in that part of the spring length having the thickness W.
Claim 4
Dependent Claim
15 words
A spring as claimed in claim 2 wherein said neutral surface comprises a cylindrical surface.
Claim 5
Dependent Claim
36 words
A spring as claimed in claim 3 wherein the number of U-shaped sections extending radially outwardly of said neutral surface is one less than the number of U-shaped sections extending radially inwardly of said neutral surface.
Claim 6
Dependent Claim
29 words
A spring as claimed in claim 3 comprising one U-shaped section extending radially outwardly of said neutral surface and two U-shaped sections extending radially inwardly of said neutral surface.
Claim 7
Dependent Claim
24 words
A spring as claimed in claim 1 wherein: each spring part at said neutral surface forms an angle to said central axis of 90°±5°.
Claim 8
Dependent Claim
15 words
A spring as claimed in claim 1 wherein said neutral surface comprises a cylindrical surface.
Claim 9
Dependent Claim
15 words
A spring as claimed in claim 1 wherein said neutral surface comprises a conical surface.
Claim 10
Dependent Claim
29 words
A spring as claimed in claim 1 wherein said neutral surface comprises a double conical surface, said conical surfaces having opposite inclinations so that said surfaces intersect each other.
Claim 11
Dependent Claim
36 words
A spring as claimed in claim 1 wherein the number of U-shaped sections extending radially outwardly of said neutral surface is one less than the number of U-shaped sections extending radially inwardly of said neutral surface.
Claim 12
Dependent Claim
29 words
A spring as claimed in claim 10 comprising one U-shaped section extending radially outwardly of said neutral surface and two U-shaped sections extending radially inwardly of said neutral surface.
Claim 13
Dependent Claim
33 words
A spring as claimed in claim 1 comprising two U-shaped sections oppositely directed so that both sections extend radially outwardly of said neutral surface and are integrated to form a slightly flattened toroid.
Claim 14
Dependent Claim
24 words
A spring as claimed in claim 1 wherein: each spring part at said neutral surface forms an angle to said central axis of 86.4°±0.5°/-0.1°.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |