US3611981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas pressure operated alarm device
Assignee: Draegerwerk AG and Co KGaA
•
Filing: 1970-11-02
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Granted: 1971-10-12
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Expires: 1990-11-02
Abstract
Abstract An alarm device particularly for respirators having a pressure gas supply includes a housing, or body, having a first gas chamber which is adapted to be connected to the pressure gas supply. A valve is movable in the first gas chamber and it closes off a connection of the chamber with a second chamber having a second valve therein which closes the second chamber in respect to a discharge gas passage which connects to a signaling device such as gas operated whistle. A spring biases the first valve toward an open position and when the gas pressure in the line reduces, it opens the first valve and permits flow of the gas under pressure into the second chamber until it pressurizes sufficiently to open the second valve to permit the gas to flow to the signaling device and actuate the whistle. The second valve includes a control device defining a throttle passage which permits flow from a connecting chamber portion of the second chamber on one side of the second valve into an equalizing chamber portion on the other side of the second valve. After some time, the pressure equilibrium is again established in the second gas chamber to close the second valve again and to stop the flow of gas to the signaling device.
Inventors
- 👤 Ernst Warncke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:20
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/006; A61; A61M; A61M16/00; A61M16/0051; G; G01; G01L; G01L19/00; G01L19/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
230 words
An alarm for a respirator having a pressure gas line comprising, a housing having wall means defining a first gas chamber adapted to be connected to a pressure line and having a second gas chamber connected to said first chamber, said wall means defining a signal gas discharge passage connected to said second gas chamber, said first gas chamber having a first gas chamber discharge passage connected to said second gas chamber, a first valve closing said first gas chamber discharge passage at a predetermined pressure condition in said line and opening said first gas chamber discharge passage upon reduction of the pressure from said predetermined pressure condition, a second valve closing said signal gas discharge passage and dividing said second gas chamber into a connecting chamber portion connected to said first gas discharge passage and an equalizing chamber portion on the other side of said second valve control means associated with said second valve and defining a throttle passage from said connecting chamber portion to said equalizing chamber portion, said spring means biasing said first valve toward an opening direction, and second spring means biasing Said second valve toward a closing position, said first valve being operable by said first spring means upon the dropping of said predetermined pressure in the pressure gas line to cause flow of gas to said second chamber and said signal gas discharge passage.
Claim 2
Dependent Claim
230 words
An alarm for a respirator having a pressure gas line comprising, a housing having wall means defining a first gas chamber adapted to be connected to a pressure line and having a second gas chamber connected to said first chamber, said wall means defining a signal gas discharge passage connected to said second gas chamber, said first gas chamber having a first gas chamber discharge passage connected to said second gas chamber, a first valve closing said first gas chamber discharge passage at a predetermined pressure condition in said line and opening said first gas chamber discharge passage upon reduction of the pressure from said predetermined pressure condition, a second valve closing said signal gas discharge passage and dividing said second gas chamber into a connecting chamber portion connected to said first gas discharge passage and an equalizing chamber portion on the other side of said second valve control means associated with said second valve and defining a throttle passage from said connecting chamber portion to said equalizing chamber portion, said spring means biasing said first valve toward an opening direction, and second spring means biasing Said second valve toward a closing position, said first valve being operable by said first spring means upon the dropping of said predetermined pressure in the pressure gas line to cause flow of gas to said second chamber and said signal gas discharge passage.
Claim 3
Dependent Claim
26 words
An alarm, according to claim 1, wherein said control means includes a passage extending therethrough and a throttle installed in the central portion of said passage.
Claim 4
Dependent Claim
51 words
An alarm, according to claim 1, wherein said first valve comprises a piston slidable in said first gas chamber and having a passage defined therethrough, said passage being closed when said valve is in a closed position and being opened to communicate flow therethrough and to said first gas discharge passage.
Claim 5
Dependent Claim
16 words
An alarm, according to claim 1, wherein said signal gas discharge passage includes a throttle therein.
Claim 6
Dependent Claim
61 words
An alarm, according to claim 1, wherein said housing wall means includes an elongated portion having an intermediate valve seat and having one end defining the inlet to said first gas chamber and having an opening through said valve seat leading to said connecting passage, said first spring means comprising a spring in said connecting passage biased against said valve member.
Claim 7
Dependent Claim
24 words
An alarm, according to claim 1, wherein said second valve comprises a diaphragm, said control means comprising a shutter carried centrally on said diaphragm.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |