Patent US4774043A successfully refreshed from Google Patents.
US4774043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for production of a hollow shaft of fiber-reinforced plastic
Assignee: Volkswagen AG
•
Filing: 1986-04-04
•
Granted: 1988-09-27
•
Expires: 2006-04-04
Abstract
Abstract In order to achieve defined fiber orientation angles in the fiber-reinforced plastic material of a hollow shaft, consisting of such material, the hollow shaft having regions of different diameters, a braided fiber tube constituting the starting material is pulled over a core, is impregnated with settable plastic, and is hardened.
Inventors
- 👤 Hans-Dieter Beckmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:02
CPC Classifications
D; D04; D04C; D04C1/00; D04C1/06; B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/583; B29C53/585; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/54; B29C70/56; B29D; B29D99/00; B29D99/0046; F; F16; F16C; F16C3/00; F16C3/02; F16C3/026; F16C7/00; F16C7/02; F16C7/026; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2105/0827; B29L; B29L2023/00; B29L2023/22; B29L2031/00; B29L2031/06; D10; D10B; D10B2505/00; D10B2505/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A method for producing a hollow fiber-reinforced plastic shaft having a center axis and regions having different diameters which are rotationally symmetric, the method comprising: providing a core having a center axis and a plurality of regions having different diameters which are rotationally symmetric; mounting over the core at least one braided fiber tube having an initial braiding angle such that the tube fibers form an angle of 20°-40° with respect to the center axis of the shaft in regions of the shaft having a smallest diameter; impregnating the at least one braided fiber tube with a settable plastic for setting the tube; and setting the plastic while the tube is hled in fixed position on the different diameter regions of the core to provide a molded shaft having regions with different diameters.
Claim 2
Independent Claim
133 words
A method for producing a hollow fiber-reinforced plastic shaft having a center axis and regions having different diameters which are rotationally symmetric, the method comprising: providing a core having a center axis and a plurality of regions having different diameters which are rotationally symmetric; mounting over the core at least one braided fiber tube having an initial braiding angle such that the tube fibers form an angle of 20°-40° with respect to the center axis of the shaft in regions of the shaft having a smallest diameter; impregnating the at least one braided fiber tube with a settable plastic for setting the tube; and setting the plastic while the tube is hled in fixed position on the different diameter regions of the core to provide a molded shaft having regions with different diameters.
Claim 3
Independent Claim
135 words
A method for producing a hollow fiber-reinforced plastic shaft having a center axis and regions having different diameters which are rotationally symmetric, the method comprising: providing a core having a center axis and a plurality of regions having different diameters which are rotationally symmetric; mounting over the core at least one braided fiber tube having an initial braiding angle such that the tube fibers thereof form an angle of approximately 45° with respect to the center axis of the shaft in regions of the shaft having a largest diameter; impregnating the at least one braided fiber tube with a settable plastic for setting the tube; and setting the plastic while the tube is held in fixed position on the different diameter regions of the core to provide a molded shaft having regions with different diameters.
Claim 4
Independent Claim
135 words
A method for producing a hollow fiber-reinforced plastic shaft having a center axis and regions having different diameters which are rotationally symmetric, the method comprising: providing a core having a center axis and a plurality of regions having different diameters which are rotationally symmetric; mounting over the core at least one braided fiber tube having an initial braiding angle such that the tube fibers thereof form an angle of approximately 45° with respect to the center axis of the shaft in regions of the shaft having a largest diameter; impregnating the at least one braided fiber tube with a settable plastic for setting the tube; and setting the plastic while the tube is held in fixed position on the different diameter regions of the core to provide a molded shaft having regions with different diameters.
Claim 5
Dependent Claim
28 words
A method as defined in claim 1 or 2, wherein said impregnating step includes impregnating the at least one braided fiber tube before mounting it over the core.
Claim 6
Dependent Claim
28 words
A method as defined in claim 1 or 2, wherein said impregnating step includes impregnating the at least one braided fiber tube after mounting it over the core.
Claim 7
Dependent Claim
55 words
A method as defined in claim 1, wherein said step of mounting at least one braided tube includes mounting a fiber tube having an initial braiding angle so that the fibers form an angle of approximately 45° with respect to the axis of the hollow shaft in regions of the shaft having a largest diameter.
Claim 8
Dependent Claim
30 words
A method as defined in claim 1 or 2, wherein said step of mounting a fiber tube includes mounting the fiber tube in a plurality of layers in different directions.
References Cited (Backward Citations)
US3183135A
Cited
US2897840A
Cited
US2995781A
Cited
US3045281A
Cited
US3284849A
Cited
US3966864A
Cited
US4126659A
Cited
US4364894A
Cited
US4512836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |