US3584596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure warning device
Assignee: Scott Technologies Inc
•
Filing: 1968-12-05
•
Granted: 1971-06-15
•
Expires: 1988-12-05
Abstract
Abstract A low pressure warning apparatus having a valve body in which fluid under pressure from a container or supply line being sensed is admitted through a spring-loaded check valve into a fluid pressure storage chamber within the valve body. Upon a reduction in supply line pressure, the chick valve is closed to trap fluid under predetermined pressure in said storage chamber. The trapped fluid under pressure is utilized to unseat a valve means, preferably upon a further reduction in supply line pressure, whereby communication is established from said storage chamber to a fluid pressure responsive means in the valve body. The fluid pressure responsive means includes a piston having a striker operable to ring a bell upon the admission of pressure fluid to said piston from said storage chamber.
Inventors
- 👤 Paul W Westcott
- 👤 Allan M Bickford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:51
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
A warning apparatus for sensing a predetermined low fluid pressure in a first conduit means supplying a breathing fluid to a user, comprising: a housing forming a fluid pressure storage chamber, check valve means interposed between said storage chamber and said first conduit means, said fist conduit means charging said storage chamber with a fluid at a first predetermined pressure level, alarm means mounted adjacent said housing, fluid pressure responsive means mounted in said housing and operable to actuate said alarm means, second conduit means interposed between said storage chamber and said fluid pressure responsive means, second valve means disposed in said second conduit means and responsive to the pressure in said storage chamber and means placing said second valve means in fluid communication with said first conduit means, whereby said second valve means is operable to permit fluid flow from said storage chamber to said pressure responsive means to actuate the alarm means when the fluid pressure being sensed in said first conduit means falls below a second predetermined pressure levEl lower than said first predetermined pressure level in the storage chamber.
Claim 2
Dependent Claim
183 words
A warning apparatus for sensing a predetermined low fluid pressure in a first conduit means supplying a breathing fluid to a user, comprising: a housing forming a fluid pressure storage chamber, check valve means interposed between said storage chamber and said first conduit means, said fist conduit means charging said storage chamber with a fluid at a first predetermined pressure level, alarm means mounted adjacent said housing, fluid pressure responsive means mounted in said housing and operable to actuate said alarm means, second conduit means interposed between said storage chamber and said fluid pressure responsive means, second valve means disposed in said second conduit means and responsive to the pressure in said storage chamber and means placing said second valve means in fluid communication with said first conduit means, whereby said second valve means is operable to permit fluid flow from said storage chamber to said pressure responsive means to actuate the alarm means when the fluid pressure being sensed in said first conduit means falls below a second predetermined pressure levEl lower than said first predetermined pressure level in the storage chamber.
Claim 3
Dependent Claim
39 words
A warning apparatus as defined in claim 1 wherein said second valve means comprising a resilient sealing element engageable with a seat in said housing for blocking fluid pressure flow between said storage chamber and said pressure responsive means.
Claim 4
Dependent Claim
17 words
A warning apparatus as defined in claim 2 wherein said second valve means is a diaphragm valve.
Claim 5
Dependent Claim
50 words
A warning apparatus as defined in claim 3 wherein said diaphragm valve has opposite sides; one of said sides having a large effective area exposed to pressure in said first conduit means and the other side having a lesser effective area exposed to fluid under pressure in said storage chamber.
Claim 6
Dependent Claim
17 words
A warning apparatus as defined in claim 2 wherein said second valve means is a piston valve.
Claim 7
Dependent Claim
50 words
A warning apparatus as defined in claim 5 wherein said piston valve has opposite sides; one of said sides having a large effective area exposed to pressure in said first conduit means and the other side having a lesser effective area exposed to fluid under pressure in said storage chamber.
Claim 8
Dependent Claim
69 words
A warning apparatus as defined in claim 1 wherein said pressure responsive means includes a bore, a plate in said bore having an opening connected to said means, a seat surrounding said opening in said plate, a plunger slidable in said bore having a piston at one end engageable with said seat, and vent passage means connecting said bore to atmosphere when said plunger moves away from said seat.
Claim 9
Dependent Claim
20 words
A warning apparatus as defined in claim 7 wherein the other end of said plunger is engageable with said alarm.
References Cited (Backward Citations)
US1083351A
Cited
US1723218A
Cited
US1929019A
Cited
US1820147A
Cited
US2028605A
Cited
US2617380A
Cited
US2854001A
Cited
US2892436A
Cited
US3224409A
Cited
US3288101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |