US3844730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a rotor or shaft of low deformability
Assignee: MAN AG
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Filing: 1971-08-19
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Granted: 1974-10-29
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Expires: 1991-08-19
Abstract
Abstract A process for the manufacture of a rotor or shaft of low deformability, suitable for high peripheral speeds which involves the steps of disposing a metallic cylinder of a high specific modulus of elasticity on the inside of a fibre-reinforced plastic cylinder of a low specific modulus of elasticity and building up an internal stress condition so that tangentially directed tensile stresses occur in the plastic cylinder and tangentially directed compressive stresses occur in the metallic cylinder, when in the rest condition, while tensile stresses occur by both cylinders at operating speed.
Inventors
- 👤 F Laussermair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
F; F16; F16C; F16C15/00; B; B29; B29C; B29C63/00; B29D; B29D99/00; B29D99/0032; B29D99/0035; F16C13/00; B29L; B29L2031/00; B29L2031/32; B29L2031/324; Y; Y10; Y10S; Y10S464/00; Y10S464/902; Y10S464/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/49826; Y10T29/49863; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
Process for the manufacture of a rotoR or shaft of low deformability, especially suitable for high peripheral speeds, comprising: concentrically disposing a metallic cylinder of high specific modulus of elasticity on the inside of a fiber-reinforced plastic cylinder of low specific modulus of elasticity, prestressing said two cylinders by a first rotation of the rotor or shaft utilizing the Bauschinger effect occurring in metals, stressing the metallic cylinder beyond its yield point, and building up an internal stress condition so that, in the rest position, tangentially directed tensile stresses occur in the plastic cylinder and tangentially directed compressive stresses occur in the metallic cylinder, while tensile stresses occur in both cylinders at operating speed.
Claim 2
Dependent Claim
114 words
Process for the manufacture of a rotoR or shaft of low deformability, especially suitable for high peripheral speeds, comprising: concentrically disposing a metallic cylinder of high specific modulus of elasticity on the inside of a fiber-reinforced plastic cylinder of low specific modulus of elasticity, prestressing said two cylinders by a first rotation of the rotor or shaft utilizing the Bauschinger effect occurring in metals, stressing the metallic cylinder beyond its yield point, and building up an internal stress condition so that, in the rest position, tangentially directed tensile stresses occur in the plastic cylinder and tangentially directed compressive stresses occur in the metallic cylinder, while tensile stresses occur in both cylinders at operating speed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |