Patent US5065988A successfully refreshed from Google Patents.
US5065988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring for compression and tension, mainly in axial direction
Assignee: Individual
•
Filing: 1987-08-11
•
Granted: 1991-11-19
•
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 18:15
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°.
References Cited (Backward Citations)
US3036180A
Cited
US3272491A
Cited
US3444962A
Cited
US3989232A
Cited
US4815663A
Cited
US4235427A
Cited
US4512209A
Cited
DE3536661A1
Cited
US4905972A
Cited
DE3515525A1
Cited
WO1987000252A1
Cited
US4832320A
Cited
WO1987006986A1
Cited
US4927124A
Cited
WO1988003617A1
Cited
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 |