US3639711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-operated timing device with solenoid-closable vent in valve chamber
Assignee: Individual
•
Filing: 1970-11-09
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Granted: 1972-02-01
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Expires: 1990-11-09
Abstract
Abstract A timing device having a vacuum chamber enclosing a diaphragm which is mechanically connected to a switch in an electric circuit. The vacuum chamber is connected to a source of vacuum through a port controlled by a check valve and also through an adjustable restricted passage which bypasses the port. When vacuum at the source drops below a predetermined level, air is evacuated from the chamber after a delay determined by the selected size of the restricted passage. A vent in the valve chamber wall normally is open to atmosphere and the circuit includes a control device which closes the vent when the circuit is energized.
Inventors
- 👤 Leslie H Jordan
- 👤 John Arden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:44
CPC Classifications
H; H01; H01H; H01H43/00; H01H43/24; H01H43/28; H01H43/285
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
157 words
A timing device comprising a casing having a vacuum chamber, a diaphragm mounted in the casing to seal off one end of the vacuum chamber, switch means included in an electric circuit, means operatively connecting the diaphragm to the switch means, said casing having a port connecting the vacuum chamber to a source of vacuum, a check valve mounted in the casing to open and close the port, said check valve closing the port in response to a predetermined level of vacuum at the source, said casing having a restricted passage connecting the vacuum chamber to the port and a vent normally open to atmosphere, and control means in the electric circuit adapted to be actuated by energization of said circuit to close the vent whereby the vacuum chamber is evacuated through the restricted passage and over a selected period of time at the end of which the diaphragm is flexed and the switch means is actuated.
Claim 2
Dependent Claim
157 words
A timing device comprising a casing having a vacuum chamber, a diaphragm mounted in the casing to seal off one end of the vacuum chamber, switch means included in an electric circuit, means operatively connecting the diaphragm to the switch means, said casing having a port connecting the vacuum chamber to a source of vacuum, a check valve mounted in the casing to open and close the port, said check valve closing the port in response to a predetermined level of vacuum at the source, said casing having a restricted passage connecting the vacuum chamber to the port and a vent normally open to atmosphere, and control means in the electric circuit adapted to be actuated by energization of said circuit to close the vent whereby the vacuum chamber is evacuated through the restricted passage and over a selected period of time at the end of which the diaphragm is flexed and the switch means is actuated.
Claim 3
Dependent Claim
49 words
A timing device as claimed in claim 1, in which said control means comprises a solenoid connected into the electric circuit, an armature mounted on the solenoid to extend alongside the casing, and a stopper pad on the free end of the arm to close the normally open vent.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |