US4448460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic bearing
Assignee: Canon Inc
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Filing: 1983-03-17
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Granted: 1984-05-15
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Expires: 2003-03-17
Abstract
Abstract A hydrostatic bearing having an increased load capacity and rigidity as compared with conventional hydrostatic bearings. To increase its load capacity and rigidity, the hydrostatic bearing of this application has peripheral air supply holes substantially on the same circumference centered at a central air supply hole provided centrally of a recess.
Inventors
- 👤 Hironori Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:24
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C29/00; F16C29/02; F16C29/025; F16C32/0603
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
190 words
A hydrostatic bearing, comprising: a first member; a second member having a surface opposed to a surface of said first member, said first and second members being movable relative to each other; a protuberance formed at an outer peripheral portion of said first member, said protuberance and said opposing surfaces of said first and second members defining a recess therebetween; and means, in communication with the recess, defining a plurality of holes for supplying high pressure gas to the recess, wherein when pressurized gas is supplied to the recess the following relationships are satisfied: λ is in the range of 0.02 to 0.06; α is in the range of 0.001 to 0.01; and β is in the range of 0.2 to 0.7 where λ=(ln Da/Ds)/(ln Ds/Di) α=Di/Da β=Cs/Cr with Da being the diameter of said first member, Ds being the diameter of the recess, Di being the diameter of each of said plurality of holes, Cs being the gap formed between said surface of said second member and said protuberance and Cr being said gap formed between said surface of said second member and the surface of said first member.
Claim 2
Dependent Claim
190 words
A hydrostatic bearing, comprising: a first member; a second member having a surface opposed to a surface of said first member, said first and second members being movable relative to each other; a protuberance formed at an outer peripheral portion of said first member, said protuberance and said opposing surfaces of said first and second members defining a recess therebetween; and means, in communication with the recess, defining a plurality of holes for supplying high pressure gas to the recess, wherein when pressurized gas is supplied to the recess the following relationships are satisfied: λ is in the range of 0.02 to 0.06; α is in the range of 0.001 to 0.01; and β is in the range of 0.2 to 0.7 where λ=(ln Da/Ds)/(ln Ds/Di) α=Di/Da β=Cs/Cr with Da being the diameter of said first member, Ds being the diameter of the recess, Di being the diameter of each of said plurality of holes, Cs being the gap formed between said surface of said second member and said protuberance and Cr being said gap formed between said surface of said second member and the surface of said first member.
Claim 3
Dependent Claim
49 words
A hydrostatic bearing according to claim 1, wherein said plurality of holes includes a central hole disposed in alignment with the centermost portion of the recess, and four peripheral holes disposed on a circumference centered at said central hole and spaced apart from each other by an equal amount.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |