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US4319790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water lubricated sleeve bearings
Assignee: Individual
•
Filing: 1978-07-05
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Granted: 1982-03-16
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Expires: 1998-07-05
Abstract
Abstract A sleeve bearing is described which is useful for carrying the rotating propellor shaft of water craft, as well as for various industrial purposes. The sleeve bearing consists of a single homogeneous solid, hard elastomeric urethane polymer having a Shore D hardness of at least 60, a compressive modulus of elasticity at a 4% compressive strain of at least 50,000 psi and a dry dynamic co-efficient of friction against steel of no more than 0.20. This polymer is machined so as to fit within a cylindrical housing by means of a forced interference fit providing sufficient outward radial force by the outer surface of the sleeve on the housing to retain the bearing in movement-free fit during the operational life of the bearing.
Inventors
- 👤 George A. Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:13
CPC Classifications
F; F16; F16C; F16C17/00; F16C17/12; F16C17/14; F16C33/00; F16C33/02; F16C33/04; F16C33/22; B; B63; B63H; B63H23/00; B63H23/32; B63H23/321; B63H23/326; F16C2202/00; F16C2202/02; F16C2208/00; F16C2208/10; F16C2208/12; F16C2326/00; F16C2326/30; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/909
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A sleeve bearing for mounting in a cylindrical housing bore by means of an interference fit, said bearing consisting entirely of a single homogeneous solid, hard elastomeric urethane polymer having a Shore D hardness of at least 60, a compressive modulus of elasticity at a 4% compressive strain of at least 50,000 psi and a dry dynamic co-efficient of friction against steel of no more than 0.20, said bearing comprising a plurality of arcuate segments together forming a sleeve machined to fit within a cylindrical housing bore by means of a forced interference fit providing sufficient outward radial force by the outer surface of the segments on the housing to retain the segments in movement-free fit during the operational life of the bearing, said forced interference fit being the sole means of retaining the bearing within the housing.
Claim 2
Dependent Claim
138 words
A sleeve bearing for mounting in a cylindrical housing bore by means of an interference fit, said bearing consisting entirely of a single homogeneous solid, hard elastomeric urethane polymer having a Shore D hardness of at least 60, a compressive modulus of elasticity at a 4% compressive strain of at least 50,000 psi and a dry dynamic co-efficient of friction against steel of no more than 0.20, said bearing comprising a plurality of arcuate segments together forming a sleeve machined to fit within a cylindrical housing bore by means of a forced interference fit providing sufficient outward radial force by the outer surface of the segments on the housing to retain the segments in movement-free fit during the operational life of the bearing, said forced interference fit being the sole means of retaining the bearing within the housing.
Claim 3
Dependent Claim
44 words
A sleeve bearing according to claim 1, wherein at least one of said segments has a tapped hole extending longitudinally into one end of said segment, said tapped hole being adapted to receive a puller means for pulling the segment from the housing bore.
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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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |