Patent US4744675A successfully refreshed from Google Patents.
US4744675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving mechanism
Assignee: Canon Inc
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Filing: 1987-01-16
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Granted: 1988-05-17
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Expires: 2007-01-16
Abstract
Abstract A moving mechanism for relatively moving first and second members, the mechanism comprising a first fluid discharging portion provided on the first member, for relatively supporting the second member by use of a static pressure, and a second fluid discharging portion operable to produce a static pressure that is effective to apply, to the first member, a force contributable to prevent any deformation of the first member due to the static pressure caused by the first fluid discharging portion.
Inventors
- 👤 Shigeo Sakino
- 👤 Mahito Negishi
- 👤 Koichi Matsushita
- 👤 Michio Horikoshi
- 👤 Makoto Higomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:31
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; B; B23; B23Q; B23Q1/00; B23Q1/25; B23Q1/26; B23Q1/28; B23Q1/38; B23Q1/44; B23Q1/56; B23Q1/58; F16C29/00; F16C29/02; F16C29/025; F16C2322/00; F16C2322/39
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
216 words
A movement guiding device, comprising: a guiding member having first and second surfaces which are in a back-to-back relation; a supporting member extending so as to substantially embrace said guiding member, said supporting member having (i) a third surface opposed to the first surface of said guiding member, (ii) a fourth surface opposed to the second surface of said guiding member and (iii) a fifth surface which is in a back-to-back relation with the fourth surface of said supporting member; a stationary member on which said guiding member is fixedly provided, said stationary member having a sixth surface opposed to the fifth surface of said supporting member; a first fluid bearing element provided on the third surface of said supporting member opposed to the first surface of said guiding member; a second fluid bearing element provided on the fourth surface of said supporting member opposed to the second surface of said guiding member; and a third fluid bearing element provided on the fifth surface of said supporting member opposed to the sixth surface of said stationary member, said third fluid bearing element being effective to prevent deformation of at least a portion of said supporting member in the neighborhood of the fourth and fifth surfaces thereof due to the effect of said second fluid bearing element.
Claim 2
Dependent Claim
216 words
A movement guiding device, comprising: a guiding member having first and second surfaces which are in a back-to-back relation; a supporting member extending so as to substantially embrace said guiding member, said supporting member having (i) a third surface opposed to the first surface of said guiding member, (ii) a fourth surface opposed to the second surface of said guiding member and (iii) a fifth surface which is in a back-to-back relation with the fourth surface of said supporting member; a stationary member on which said guiding member is fixedly provided, said stationary member having a sixth surface opposed to the fifth surface of said supporting member; a first fluid bearing element provided on the third surface of said supporting member opposed to the first surface of said guiding member; a second fluid bearing element provided on the fourth surface of said supporting member opposed to the second surface of said guiding member; and a third fluid bearing element provided on the fifth surface of said supporting member opposed to the sixth surface of said stationary member, said third fluid bearing element being effective to prevent deformation of at least a portion of said supporting member in the neighborhood of the fourth and fifth surfaces thereof due to the effect of said second fluid bearing element.
Claim 3
Dependent Claim
36 words
A device according the claim 1, wherein each of said first, second and third fluid bearing elements is arranged so as to discharge fluid toward a surface opposed to the surface on which it is provided.
Claim 4
Dependent Claim
25 words
A device according to claim 1, wherein said supporting member includes a table adapted to carry thereon a workpiece which is to be guidingly moved.
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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |