US4530490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-reinforced plastics leaf spring
Assignee: NHK Spring Co Ltd
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Filing: 1983-08-03
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Granted: 1985-07-23
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Expires: 2003-08-03
Abstract
Abstract An FRP leaf spring wherein finer continuous fibers are embedded in that thickness range of the leaf spring to which tension stress is applied, and continuous fibers of greater diameters are embedded in that thickness range of the leaf spring to which compression stress is applied.
Inventors
- 👤 Atsushi Misumi
- 👤 Shuji Hiromoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:30
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/366; F16F1/368; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
An FRP leaf spring which comprises a plurality of continuous fibers arranged to extend within a number of adjacent thickness ranges of the leaf spring, and a resin in which said plural continuous fibers are embedded, said continuous fibers being of such diameter as corresponds to the position of that thickness range of the leaf spring in which said fibers are embedded, wherein the fibers in each of said thickness ranges have a diameter which is different from the diameters of the fibers in a next adjacent thickness range.
Claim 2
Dependent Claim
89 words
An FRP leaf spring which comprises a plurality of continuous fibers arranged to extend within a number of adjacent thickness ranges of the leaf spring, and a resin in which said plural continuous fibers are embedded, said continuous fibers being of such diameter as corresponds to the position of that thickness range of the leaf spring in which said fibers are embedded, wherein the fibers in each of said thickness ranges have a diameter which is different from the diameters of the fibers in a next adjacent thickness range.
Claim 3
Dependent Claim
103 words
An FRP leaf spring which comprises a plurality of continuous fibers arranged to extend within a number of adjacent thickness ranges of the leaf spring, and a resin in which said plural continuous fibers are embedded, said continuous fibers being of such diameter as corresponds to the position of that thickness range of the leaf spring in which said fibers are embedded, wherein the continuous fibers embedded in that thickness range of the leaf spring to which a tension stress is applied are chosen to have a smaller diameter than those which are embedded in the other thickness ranges of the leaf spring.
Claim 4
Dependent Claim
103 words
An FRP leaf spring which comprises a plurality of continuous fibers arranged to extend within a number of adjacent thickness ranges of the leaf spring, and a resin in which said plural continuous fibers are embedded, said continuous fibers being of such diameter as corresponds to the position of that thickness range of the leaf spring in which said fibers are embedded, wherein the continuous fibers embedded in that thickness range of the leaf spring to which a tension stress is applied are chosen to have a smaller diameter than those which are embedded in the other thickness ranges of the leaf spring.
Claim 5
Dependent Claim
49 words
The FRP leaf spring according to claim 2, wherein the continuous fibers embedded in that thickness ranges of the leaf spring to which a compression stress is applied are chosen to have a greater diameter than those which are embedded in the other thickness range of the leaf spring.
Claim 6
Dependent Claim
125 words
The FRP leaf spring according to claim 1, wherein the continuous fibers embedded in that thickness range of the leaf spring to which a tension stress is applied are chosen to have a smaller diameter, and the continuous fibers embedded in that thickness range of the leaf spring to which a compression stress is applied are chosen to have a greater diameter, and the continuous fibers embedded in a thickness range of the leaf spring which is positioned intermediate between said tension stress range and said compression stress range are chosen to have such diameter as is defined to be intermediate between that of the continuous fibers embedded in the tension stress range and that of the continuous fibers embedded in the compression stress range.
Claim 7
Dependent Claim
47 words
The FRP leaf spring according to claim 1, whose thickness is divided into a plurality of layers, and wherein finer fibers are embedded in that layer of the leaf spring which lies nearer to the surface of the leaf spring to which a tension stress is applied.
Claim 8
Dependent Claim
56 words
The FRP leaf spring according to claim 1, wherein the continuous fibers embedded in those thickness ranges of the leaf spring which respectively extend from front and back surfaces of the spring at a prescribed distance are chosen to have a smaller diameter than the diameters of the continuous fibers embedded in an intermediate thickness range.
Claim 9
Dependent Claim
56 words
The FRP leaf spring according to claim 1, wherein the continuous fibers embedded in those thickness ranges of the leaf spring which respectively extend from front and back surfaces of the spring at a prescribed distance are chosen to have a greater diameter than the diameters of the continuous fibers embedded in an intermediate thickness range.
Claim 10
Dependent Claim
57 words
The FRP leaf spring according to claim 1, wherein the continuous fibers embedded in a narrower thickness range of the leaf spring to which a compression stress is applied are chosen to have a greater diameter, and the continuous fibers embedded in the remaining thickness range of the leaf spring are chosen to have a smaller diameter.
Claim 11
Dependent Claim
27 words
The FRP leaf spring according to claim 1, wherein the continuous fibers are embedded in a state symmetrically inclined to the lengthwise direction of the leaf spring.
Claim 12
Dependent Claim
23 words
The FRP leaf spring according to claim 1, wherein the continuous fibers are embedded in a state extending lengthwise of the leaf spring.
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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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |