US4098284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for gas supply pipe
Assignee: Individual
•
Filing: 1977-01-04
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Granted: 1978-07-04
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Expires: 1997-01-04
Abstract
Abstract A gas supply pipe is provided with a terminal shutoff valve upstream of a heater, stove or the like. An automatic shutoff valve is provided to the gas pipe upstream of the terminal shutoff valve which automatically closes upon receipt of an electrical signal from an earthquake sensor, fire detector, gas leak detector or other sensor indicating a dangerous condition. A gas pressure sensor provided between the automatic shutoff valve and the terminal shutoff valve prevents the automatic shutoff valve from being manually reset unless the terminal shutoff valve is closed, thereby preventing an explosion which might result if gas were fed to the heater or stove with the pilot light extinguished.
Inventors
- 👤 Masafusa Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:04
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16K; F16K17/00; F16K17/36; F23; F23N; F23N5/00; F23N5/24; F23N5/245; F23N2231/00; F23N2231/14; F23N2231/18; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0777; Y10T137/7722; Y10T137/7723; Y10T137/8593; Y10T137/87917
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A safety device for a gas pipe having a terminal shutoff valve comprising: an automatic shutoff valve provided to the gas pipe upstream of the terminal shutoff valve including an actuator member and biasing means urging the actuator member toward a valve closing position; first latch means for latching the actuator member in a valve opening position and being actuatable by an electrical shutoff signal to release the actuator member allowing the actuator member to be moved to the valve closing position by the biasing means; second latch means for latching the actuator member in the valve closing position; and sensor means for generating and feeding an electrical reset signal to the second latch means to actuate the second latch means to release the actuator member for manual movement to the valve opening position against the force of the biasing means when the terminal shutoff valve is closed.
Claim 2
Dependent Claim
148 words
A safety device for a gas pipe having a terminal shutoff valve comprising: an automatic shutoff valve provided to the gas pipe upstream of the terminal shutoff valve including an actuator member and biasing means urging the actuator member toward a valve closing position; first latch means for latching the actuator member in a valve opening position and being actuatable by an electrical shutoff signal to release the actuator member allowing the actuator member to be moved to the valve closing position by the biasing means; second latch means for latching the actuator member in the valve closing position; and sensor means for generating and feeding an electrical reset signal to the second latch means to actuate the second latch means to release the actuator member for manual movement to the valve opening position against the force of the biasing means when the terminal shutoff valve is closed.
Claim 3
Dependent Claim
31 words
A safety device as in claim 1, further comprising manual reset signal generator means for generating and feeding the reset signal to the second latch means independently of the sensor means.
Claim 4
Dependent Claim
47 words
A safety device as in claim 1, in which the sensor means comprises a gas pressure sensor provided to the gas pipe between the automatic shutoff valve and the terminal shutoff valve for generating the reset signal when the sensed gas pressure is above a predetermined value.
Claim 5
Dependent Claim
43 words
A safety device as in claim 3, in which the gas pressure sensor comprises a pressure sensitive diaphragm and a reset switch actuated by the diaphragm to cause generation of the reset signal when the sensed gas pressure is above the predetermined value.
Claim 6
Dependent Claim
36 words
A safety device as in claim 4, further comprising a manual reset switch connected in parallel with the reset switch of the gas pressure sensor to generate the reset signal independently of the gas pressure sensor.
Claim 7
Dependent Claim
20 words
A safety device as in claim 1, in which the first and second latch means each comprise electromagnetic solenoid means.
Claim 8
Dependent Claim
62 words
A safety device as in claim 6, in which the electromagnetic solenoid means of each of the first and second latch means comprises a latch member and biasing means urging the latch member into operative engagement with the actuator member, the electromagnetic solenoid means moving the latch member out of engagement with the actuator member when actuated by the respective electrical signal.
References Cited (Backward Citations)
US2652065A
Cited
US3506033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |