US3800816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel line shut off
Assignee: Follett Valves Inc
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Filing: 1972-06-26
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Granted: 1974-04-02
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Expires: 1992-06-26
Abstract
Abstract A device for providing safety shut off of a fuel line in response to an unsafe condition, such as overheating. The device includes a movable diaphragm forming a wall of an expensible chamber and a valve closure member movable with a stem connected to the diaphragm. A separate excess flow valve may be connected to the diaphragm chamber for actuation in response to expansion of the chamber by diaphragm movement. The stem is spring biased toward movement to expand the chamber and close the valve element associated with the stem. Means are provided to hold the stem against the biasing force and are releasable by the breaking of a link when the unsafe condition is present.
Inventors
- 👤 J Follett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:51
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; F16K17/38; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1819; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A safety shut-off system for a fuel supply line, said system comprising, in combination: a. a valve interposed in the supply line and adapted to close in response to an abnormal flow rate of the fuel; and b. a control device connected to said valve to effect closure thereof in response to an unsafe condition, said control device having: i. an expansible chamber communicating with said valve on the downstream side thereof, whereby rapid expansion of said chamber produces an abnormal flow rate, and thereby closure of said valve; ii. means biasing a movable portion of said chamber toward rapidly expanding movement; iii. means normally retaining said movable portion in an initial position, against the force of said biasing means; and iv. means for releasing said retaining means in response to said unsafe condition.
Claim 2
Dependent Claim
134 words
A safety shut-off system for a fuel supply line, said system comprising, in combination: a. a valve interposed in the supply line and adapted to close in response to an abnormal flow rate of the fuel; and b. a control device connected to said valve to effect closure thereof in response to an unsafe condition, said control device having: i. an expansible chamber communicating with said valve on the downstream side thereof, whereby rapid expansion of said chamber produces an abnormal flow rate, and thereby closure of said valve; ii. means biasing a movable portion of said chamber toward rapidly expanding movement; iii. means normally retaining said movable portion in an initial position, against the force of said biasing means; and iv. means for releasing said retaining means in response to said unsafe condition.
Claim 3
Dependent Claim
50 words
The invention according to claim 1 wherein said chamber comprises a solid casing, said movable portion comprises an impervious diaphragm having an attached stem to effect movement thereof, and said biasing means comprises a spring urging said stem toward moving said diaphragm to expand the interior volume of said chamber.
Claim 4
Dependent Claim
86 words
The invention according to claim 2 wherein said retaining means comprise at lease one member positioned to block movement of said stem, and said releasing means comprises a link breakable in response to said unsafe condition, said member and link being so constructed and arranged that said link holds said member in position to block movement of said stem until said link is broken, whereupon said member may move out of its blocking position to allow movement of said stem and diaphragm to expand said chamber.
Claim 5
Dependent Claim
15 words
A control device according to claim 3 in which the link comprise a fusible element.
Claim 6
Dependent Claim
58 words
The invention according to claim 1 wherein the communication of said valve and expansible chamber forms an inlet to said device for the fuel, and said device further includes an outlet and a movable valve closure element interposed between said inlet and outlet, and movable from open to closed position in response to release of said retaining means.
Claim 7
Dependent Claim
25 words
The invention according to claim 5 wherein said movable portion comprises a stem and said closure element is arranged on one end of said stem.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |