US5205078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1991-08-28
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Granted: 1993-04-27
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Expires: 2011-08-28
Abstract
Abstract A rotary apparatus includes a rotary spindle, a front end portion of which projects from a shell to an outside thereof and which is supported by magnetic force while the spindle is rotating, a working tool being mountable on the front end portion of the spindle. A first sensor is provided for detecting a position of the front end portion of the spindle in a radial direction thereof and is provided on the front end portion of the shell and in an annular space formed at a periphery of the front end portion of the spindle such that the first sensor occupies a volume of not more than 50% of the annular space. A second sensor is provided, for detecting a position of a rear end portion of the spindle in the radial direction thereof and is provided on the rear end portion of the shell.
Inventors
- 👤 Akira Takara
- 👤 Toru Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:43
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C33/00; F16C33/02; F16C33/04; B; B23; B23Q; B23Q1/00; B23Q1/70; B24; B24B; B24B41/00; B24B41/04; B24B41/044; B24B49/00; B24B49/02; F16C32/0444; F16C32/0446; H; H02; H02K; H02K7/00; H02K7/08; H02K7/09; F16C2322/00; F16C2322/39; F16C32/0474; F16C32/0489
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
A rotary apparatus comprising: a shell; a rotary spindle mounted in said shell and having a front end portion extending to an outside of said shell and adapted to carry a working tool; magnetic bearings mounted in said shell and magnetically supporting said rotary spindle when said spindle rotates; a first sensor for detecting a radial position of said front end portion of said spindle relative to said shell; a second sensor for detecting a radial position of a rear end portion of said spindle relative to said shell; wherein said second sensor is mounted in a rear end portion of said shell; wherein said first sensor is mounted to a front end portion of said shell outside said shell; and wherein said first sensor occupies an arc-shaped area extending about less than 50% of a circumference of said spindle.
Claim 2
Dependent Claim
140 words
A rotary apparatus comprising: a shell; a rotary spindle mounted in said shell and having a front end portion extending to an outside of said shell and adapted to carry a working tool; magnetic bearings mounted in said shell and magnetically supporting said rotary spindle when said spindle rotates; a first sensor for detecting a radial position of said front end portion of said spindle relative to said shell; a second sensor for detecting a radial position of a rear end portion of said spindle relative to said shell; wherein said second sensor is mounted in a rear end portion of said shell; wherein said first sensor is mounted to a front end portion of said shell outside said shell; and wherein said first sensor occupies an arc-shaped area extending about less than 50% of a circumference of said spindle.
Claim 3
Dependent Claim
39 words
A rotary apparatus as recited in claim 1, further comprising a third sensor for detecting an axial position of said front end portion of said spindle, said third sensor being mounted to said front end portion of said shell.
Claim 4
Dependent Claim
18 words
A rotary apparatus as recited in claim 2, wherein said third sensor is offset radially from said spindle.
Claim 5
Dependent Claim
39 words
A rotary apparatus as recited in claim 1, wherein said first sensor comprises an arc-shaped bracket mounted to said front end portion of said shell outside said shell, and a pair of radial sensor elements mounted to said bracket.
Claim 6
Dependent Claim
45 words
A rotary apparatus as recited in claim 4, wherein said first sensor further includes an arc-shaped shielding section mounted to said bracket, extending radially toward said spindle, and disposed on a side of said radial sensor elements opposite said front end portion of said shell.
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) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |