US4267490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary switching control circuit for an electrically adjustable patient chair
Assignee: FIRSTMERIT BANK NA
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Filing: 1979-08-14
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Granted: 1981-05-12
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Expires: 1999-08-14
Abstract
Abstract A switching control circuit for an electrically adjustable patient chair that utilizes a relay control circuit comprised of a plurality of switching control relays connected in a binary switching arrangement which in the preferred embodiment herein, permits the use of only three control relays to control six motor adjustment functions.
Inventors
- 👤 Paul G. Thiene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:16
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
209 words
A switching control circuit for selectively controlling the energization of six motor windings for providing lift, tilt and head adjustments on an electrically adjustable patient chair, comprising three relays connected to said motor windings in a binary switching arrangement for separately controlling the energization of each of said motor windings, and six manually operable switch means connected between a power source and the relay coils of said relays for controlling energization of said relay coils, wherein a first of said switches comprises a single-pole single-throw switch that is connected to the relay coil of said first relay, a second of said switches comprises a double-pole single-throw switch that is connected to the relay coils of said first and second relays, a third of said switches comprises a single-pole single-throw switch that is connected to the relay coil of said second relay, a fourth of said switches comprises a double-pole single-throw switch that is connected to the relay coils of said second and third relays, a fifth of said switches comprises a single-pole single-throw switch that is connected to the relay coil of said third relay, and a sixth of said switches comprises a double-pole single-throw switch that is connected to the relay coils of said first and third relays.
Claim 2
Dependent Claim
209 words
A switching control circuit for selectively controlling the energization of six motor windings for providing lift, tilt and head adjustments on an electrically adjustable patient chair, comprising three relays connected to said motor windings in a binary switching arrangement for separately controlling the energization of each of said motor windings, and six manually operable switch means connected between a power source and the relay coils of said relays for controlling energization of said relay coils, wherein a first of said switches comprises a single-pole single-throw switch that is connected to the relay coil of said first relay, a second of said switches comprises a double-pole single-throw switch that is connected to the relay coils of said first and second relays, a third of said switches comprises a single-pole single-throw switch that is connected to the relay coil of said second relay, a fourth of said switches comprises a double-pole single-throw switch that is connected to the relay coils of said second and third relays, a fifth of said switches comprises a single-pole single-throw switch that is connected to the relay coil of said third relay, and a sixth of said switches comprises a double-pole single-throw switch that is connected to the relay coils of said first and third relays.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |