Patent US5471802A successfully refreshed from Google Patents.
US5471802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetically suspended floating floor apparatus
Assignee: Ebara Corp
•
Filing: 1993-08-25
•
Granted: 1995-12-05
•
Expires: 2013-08-25
Abstract
Abstract An electromagnetically suspended floating floor apparatus in which a floating floor on which machines are set up is suspended from an installation floor with electromagnetic actuators so that the floating floor is spatially separated from the installation floor whereby no vibration is transmitted to equipment on the floating floor. The floating floor apparatus comprises the floating floor suspended from the installation floor at a plurality of supporting points by electromagnetic actuators, a light emitting member, fixed to a beam or a pillar, which emits a horizontal light beam, and a photosensor fixed to the installation floor which outputs a position signal representing a position of incidence of the horizontal light beam to the electromagnetic actuators. On the basis of the position signal, the electromagnetic actuators control a vertical position of the floating floor.
Inventors
- 👤 Kenichi Yano
- 👤 Yoichi Kanemitsu
- 👤 Katsuhide Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:08
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/02; F16F15/03
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A floating floor apparatus, comprising: an installation floor; a floating floor suspended above said installation floor at a plurality of supporting points on said floating floor; a plurality of electromagnetic actuators on said installation floor supporting said floating floor in a suspended state above said installation floor at respective said supporting points; a control means for supplying a control signal to each said electromagnetic actuator for controlling the vertical position of said floating floor; a light emitting means mounted at a position fixed relative to said installation floor for emitting a horizontal light beam; and a photosensing means fixed relative to said floating floor for supplying a vertical position signal representing a position of incidence of the horizontal light beam thereon to said control means.
Claim 2
Dependent Claim
125 words
A floating floor apparatus, comprising: an installation floor; a floating floor suspended above said installation floor at a plurality of supporting points on said floating floor; a plurality of electromagnetic actuators on said installation floor supporting said floating floor in a suspended state above said installation floor at respective said supporting points; a control means for supplying a control signal to each said electromagnetic actuator for controlling the vertical position of said floating floor; a light emitting means mounted at a position fixed relative to said installation floor for emitting a horizontal light beam; and a photosensing means fixed relative to said floating floor for supplying a vertical position signal representing a position of incidence of the horizontal light beam thereon to said control means.
Claim 3
Dependent Claim
31 words
The floating floor apparatus of claim 1, and further comprising a half mirror positioned so as to direct the horizontal light beam from said light emitting means to said photosensing means.
Claim 4
Dependent Claim
57 words
The floating floor apparatus of claim 2, wherein said photosensing means comprises a photosensor fixed relative to said floating floor at each respective said support point, and further comprising a plurality of half mirrors located at respective said support points along the horizontal light beam so as to direct the horizontal light beam to respective said photosensors.
Claim 5
Dependent Claim
40 words
The floating floor of claim 1, and further comprising acceleration sensors fixed relative to said floating floor and said installation floor at said support points providing output signals to said control means for control of the respective said electromagnetic actuators.
Claim 6
Dependent Claim
53 words
The floating floor apparatus of claim 1, wherein each of said electromagnetic actuators comprises a magnetic yoke fixed to and supporting said floating floor at a respective said support point and electromagnets fixed relative to said installation floor suspending said magnetic yoke, and wherein said photosensing means is fixed on said magnetic yoke.
Claim 7
Dependent Claim
19 words
The floating floor apparatus of claim 5, wherein said photosensing means comprises a photosensor on each said magnetic yoke.
Claim 8
Dependent Claim
31 words
The floating floor apparatus of claim 6, and further comprising a half mirror positioned so as to direct the horizontal light beam from said light emitting means to said said photosensor.
Claim 9
Dependent Claim
43 words
The floating floor apparatus of claim 7, and further comprising a plurality of half mirrors located at respective said support points along the horizontal light beam so as to direct the horizontal light beam to respective said photosensors on respective said magnetic yokes.
Claim 10
Dependent Claim
55 words
The floating floor apparatus of claim 6, wherein said control means comprises a plurality of control apparatus that each comprises an amplifier connected to one said photosensor, a compensation circuit receiving the output of said amplifier and a power amplifier receiving the output of said compensation circuit, said power amplifier being connected to said electromagnets.
Claim 11
Dependent Claim
20 words
The floating floor apparatus of claim 9, wherein each of said electromagnetic actuators has one said control apparatus connected therewith.
Claim 12
Dependent Claim
48 words
The floating floor apparatus of claim 10, and further comprising acceleration sensors fixed relative to said floating floor and said installation floor at one said support point providing an output signal to one said compensation circuit of one said control apparatus for control of one said electromagnetic actuator.
References Cited (Backward Citations)
US3464657A
Cited
JPS63275829A
Cited
JPH01250640A
Cited
JPH02203040A
Cited
US5121898A
Cited
EP0514877A2
Cited
US5285995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |