US3574308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manually reset safety control
Assignee: Honeywell Inc
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Filing: 1969-03-07
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Granted: 1971-04-13
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Expires: 1989-03-07
Abstract
Abstract A 100 percent safety shutoff gas valve comprising a biased closed main valve, a biased closed pilot valve, a thermoelectric power unit for holding the valves open but incapable of opening them and a plurality of pushbutton actuators that are sequentially actuated to first open the pilot valve and reset the power unit for energization by a pilot burner heated thermocouple and, thereafter, actuate another pushbutton to open the main valve. The valves are adapted to be closed either by the occurrence of a pilot burner flame failure, which deenergizes the magnet, or by depressing a third button to directly close the pilot valve and indirectly close the main valve by tripping a latching mechanism. The pushbuttons have an interlock arrangement whereby depressing of one pushbutton causes retraction of a previously actuated pushbutton.
Inventors
- 👤 Robert J Battersby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:22
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/10; F23N5/107; Y; Y10; Y10T; Y10T137/00; Y10T137/1407; Y10T137/1516; Y10T137/8593; Y10T137/87096
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
283 words
A manually reset safety control, embodiment embodying a valve body having an inlet, a main outlet and a pilot outlet, a main biased-closed fuel flow control valve and a pilot biased-closed fuel flow control valve and a condition responsive means for holding the valves open but incapable of opening them, comprising; a first valve actuator is said valve body, latch means operably connected to said first valve actuator and said main valve and detachable from one of them, a first motion transmitting means having a first portion thereof operably connected to said first valve actuator and another operable portion, a second valve actuator in said value body, means adapted to be actuated by said condition responsive means for biasing said second valve actuator in a direction to close said pilot valve and to unlatch said latch means from said main valve when an unsafe condition arises and requiring manual resetting to move said pilot valve to its open position, a seconD motion transmitting means having one portion for actuating said second valve actuator to reset said condition responsive means and open said pilot valve and another operable portion, a third motion transmitting means having a portion for actuating said second valve actuator to close said pilot value and unlatch said main valve and having another operable portion thereof, and interlock latch means arranged to selectively cooperate with said another operable portions for selectively latching one of said first, second or third motion transmitting means in its ''''on'''' ''''pilot'''' or ''''off'''' positions, respectively, said interlock latch means being so constructed and arranged that when one of said motion transmitting means is actuated the previously actuated one is released and returns to its unactuated position.
Claim 2
Dependent Claim
283 words
A manually reset safety control, embodiment embodying a valve body having an inlet, a main outlet and a pilot outlet, a main biased-closed fuel flow control valve and a pilot biased-closed fuel flow control valve and a condition responsive means for holding the valves open but incapable of opening them, comprising; a first valve actuator is said valve body, latch means operably connected to said first valve actuator and said main valve and detachable from one of them, a first motion transmitting means having a first portion thereof operably connected to said first valve actuator and another operable portion, a second valve actuator in said value body, means adapted to be actuated by said condition responsive means for biasing said second valve actuator in a direction to close said pilot valve and to unlatch said latch means from said main valve when an unsafe condition arises and requiring manual resetting to move said pilot valve to its open position, a seconD motion transmitting means having one portion for actuating said second valve actuator to reset said condition responsive means and open said pilot valve and another operable portion, a third motion transmitting means having a portion for actuating said second valve actuator to close said pilot value and unlatch said main valve and having another operable portion thereof, and interlock latch means arranged to selectively cooperate with said another operable portions for selectively latching one of said first, second or third motion transmitting means in its ''''on'''' ''''pilot'''' or ''''off'''' positions, respectively, said interlock latch means being so constructed and arranged that when one of said motion transmitting means is actuated the previously actuated one is released and returns to its unactuated position.
Claim 3
Dependent Claim
31 words
A manually reset safety control as defined in claim 1 wherein said second motion transmitting means is arranged to latch in a position intermediate its unactuated position and its resetting position.
Claim 4
Dependent Claim
28 words
A manually reset safety control as defined in claim 1 wherein said motion transmitting means include pushbuttons which are constructed to form part of said interlock latch means.
Claim 5
Dependent Claim
53 words
A manually reset safety control as defined in claim 3 wherein said first, second and third motion transmitting means are plungers with said pushbuttons mounted thereon and arranged in a common plane and part of the interlock latch means includes a pair of slidable latch plates extending across the sides of said pushbuttons.
Claim 6
Dependent Claim
26 words
A manually reset safety control as defined in claim 1 wherein said condition responsive means is a thermocouple energizable electromagnet and said valve actuators are levers.
Claim 7
Dependent Claim
34 words
A manually reset safety control as defined in claim 5 wherein said first lever is pivoted at one of its ends and said latch means is pivoted on said first lever intermediate its ends.
Claim 8
Dependent Claim
35 words
A manually reset safety control as defined in claim 1 wherein said valve actuators are levers and said latch means is pivoted on said first lever and said levers are mounted on a common pivot.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |