US3870012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure drop alarm device
Assignee: Individual
•
Filing: 1973-10-15
•
Granted: 1975-03-11
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Expires: 1993-10-15
Abstract
Abstract An alarm device for indicating a drop in pressure, particularly but not exclusively in automatic artificial respiration apparatus. The device functions pneumatically. A source of pressure fluid is connected to a timing device connected in its turn by an outlet to a pressure fluid feed conduit, via a manometric capsule which is normally closed. The latter opens when the pressure in the conduit reaches a certain maximum pressure, in order to evacuate the timing circuit. The aforementioned outlet is likewise connected to a pneumatic cell with the logical function ''''YES,'''' normally closed, in order to prevent communication between at least one alarm device and the source of pressure fluid. This cell opens if the pressure in the timing circuit exceeds a certain predetermined threshold, as a result of the fact that, since the pressure in the feed conduit has not reached the maximum value, the manometric capsule has not opened.
Inventors
- 👤 Robert Metivier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:39
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/103; A61B5/11; A61B5/113; A61M; A61M16/00; A61M16/0051; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
197 words
A pressure drop alarm device; particularly but not exclusively for use with automatic respiration apparatus, and associated with and between a feed or supply conduit for fluid under pressure and a source of pressure fluid, the device indicating that, after a certain preselected period, the pressure in the feed conduit has failed to reach a predetermined maximum P, wherein the device functions pneumatically and wherein the source of pressure fluid is connected to a timing device having an outlet connected to the feed cOnduit via a manometric capsule which is normally closed and which opens when the pressure in the said feed conduit reaches the maximum pressure P in order to evacuate pressure fluid from the timing device, the said outlet of the timing device also being connected to a pneumatic cell with a logical function ''''YES'''' normally closed to prevent the feed of fluid from the said source to at least one alarm, and opened to actuate the or each alarm if the pressure in the timing device exceeds a certain preselected threshold Pc1 caused by manometric capsule remaining closed due to the pressure in the feed conduit failing to reach the said maximum pressure P.
Claim 2
Dependent Claim
197 words
A pressure drop alarm device; particularly but not exclusively for use with automatic respiration apparatus, and associated with and between a feed or supply conduit for fluid under pressure and a source of pressure fluid, the device indicating that, after a certain preselected period, the pressure in the feed conduit has failed to reach a predetermined maximum P, wherein the device functions pneumatically and wherein the source of pressure fluid is connected to a timing device having an outlet connected to the feed cOnduit via a manometric capsule which is normally closed and which opens when the pressure in the said feed conduit reaches the maximum pressure P in order to evacuate pressure fluid from the timing device, the said outlet of the timing device also being connected to a pneumatic cell with a logical function ''''YES'''' normally closed to prevent the feed of fluid from the said source to at least one alarm, and opened to actuate the or each alarm if the pressure in the timing device exceeds a certain preselected threshold Pc1 caused by manometric capsule remaining closed due to the pressure in the feed conduit failing to reach the said maximum pressure P.
Claim 3
Dependent Claim
197 words
A pressure drop alarm device; particularly but not exclusively for use with automatic respiration apparatus, and associated with and between a feed or supply conduit for fluid under pressure and a source of pressure fluid, the device indicating that, after a certain preselected period, the pressure in the feed conduit has failed to reach a predetermined maximum P, wherein the device functions pneumatically and wherein the source of pressure fluid is connected to a timing device having an outlet connected to the feed cOnduit via a manometric capsule which is normally closed and which opens when the pressure in the said feed conduit reaches the maximum pressure P in order to evacuate pressure fluid from the timing device, the said outlet of the timing device also being connected to a pneumatic cell with a logical function ''''YES'''' normally closed to prevent the feed of fluid from the said source to at least one alarm, and opened to actuate the or each alarm if the pressure in the timing device exceeds a certain preselected threshold Pc1 caused by manometric capsule remaining closed due to the pressure in the feed conduit failing to reach the said maximum pressure P.
Claim 4
Dependent Claim
197 words
A pressure drop alarm device; particularly but not exclusively for use with automatic respiration apparatus, and associated with and between a feed or supply conduit for fluid under pressure and a source of pressure fluid, the device indicating that, after a certain preselected period, the pressure in the feed conduit has failed to reach a predetermined maximum P, wherein the device functions pneumatically and wherein the source of pressure fluid is connected to a timing device having an outlet connected to the feed cOnduit via a manometric capsule which is normally closed and which opens when the pressure in the said feed conduit reaches the maximum pressure P in order to evacuate pressure fluid from the timing device, the said outlet of the timing device also being connected to a pneumatic cell with a logical function ''''YES'''' normally closed to prevent the feed of fluid from the said source to at least one alarm, and opened to actuate the or each alarm if the pressure in the timing device exceeds a certain preselected threshold Pc1 caused by manometric capsule remaining closed due to the pressure in the feed conduit failing to reach the said maximum pressure P.
Claim 5
Dependent Claim
54 words
A device in accordance with claim 1, wherein the timing device includes a restriction and a container connected in series with the source of pressure fluid, the said timing device also comprising an inlet upstream of the said restriction connected to the source of pressure fluid, the outlet being downstream of the said container.
Claim 6
Dependent Claim
36 words
A device in accordance with claim 2, wherein the manometric capsule has an inlet connected by a conduit to the outlet of the timing device and an outlet connected by a conduit to the feed conduit.
Claim 7
Dependent Claim
50 words
A device in accordance with claim 3, wherein the manometric capsule functions as a valve having its inlet normally closed, the said inlet being opened and placed in fluid communication with the outlet of the timing device when the pressure in the feed conduit reaches the predetermined maximum pressure P.
Claim 8
Dependent Claim
45 words
A device in accordance with claim 4, wherein the pneumatic cell functions as a control valve normally closing fluid communication between an inlet of the cell connected to the source of pressure fluid and an outlet of the cell connected to the or each alarm.
Claim 9
Dependent Claim
68 words
A device in accordance with claim 5, wherein a conduit connects the outlet of the timing device to a control inlet of the pneumatic cell and wherein the pneumatic cell opens when the pressure fluid reaching it from the container through the said conduit reaches the said preselected threshold Pc1, thereby connecting the or each alarm with the source of pressure fluid to actuate the or each alarm.
Claim 10
Dependent Claim
22 words
A device in accordance with claim 1, wherein the alarms comprise at least one whistle and/or at least one pneumatic visual indicator.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |