US3896837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas mixing apparatus particularly for respirators and medical devices
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1973-10-03
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Granted: 1975-07-29
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Expires: 1993-10-03
Abstract
Abstract A gas mixing apparatus for gases under pressure particularly for respirators and medical devices which has a plurality of compressed gas supply lines which are connected to a mixing device for delivery into a mixed gas delivery line includes at least one by pass connected from at least one compressed gas supply line to the delivery line. The by pass line includes an automatically pressure operated shut off valve which is responsive to a drop off in pressure to feed gas through the by pass line to the delivery line. The shut off valve includes a settable spring biased diaphragm which carries a movable valve member which is urged against the valve seat at pressure conditions which are set for the normal operation of the device. The by pass line is open to deliver gas from the compressed air lines to the delivery line whenever the delivery line pressure drops off. A warning signal may also be arranged in the connection and in some instances a compressed gas connection to the by pass line provides means for feeding gas from a separate compressed gas supply in the event delivery pressure drops off.
Inventors
- 👤 Holmer Rohling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/12; A61M16/1005; A61M16/1015; B; B01; B01F; B01F23/00; B01F23/10; B01F23/19; B01F23/191; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2562; Y10T137/2564; Y10T137/2567; Y10T137/2569
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A gas mixing apparatus for gases under pressure, particularly for respirators and medical devices, comprising a gas mixer device, a plurality of compressed gas supply lines connected to said gas mixer device, at least one mixed gas delivery line extending out of said gas mixer device for the discharge of a mixture of gases from said compresSed gas supply lines from said gas mixer device, and at least one by pass line connected from a compressed gas supply line to said delivery line and having an automatic pressure operated shutoff valve therein responsive to a drop in pressure in said delivery line to feed gas through said by pass line to said delivery line whenever the pressure therein drops below a predetermined value, said at least one by pass line comprising a by pass line connected to each of said supply lines each having an automatically operable pressure operated shutoff valve.
Claim 2
Dependent Claim
151 words
A gas mixing apparatus for gases under pressure, particularly for respirators and medical devices, comprising a gas mixer device, a plurality of compressed gas supply lines connected to said gas mixer device, at least one mixed gas delivery line extending out of said gas mixer device for the discharge of a mixture of gases from said compresSed gas supply lines from said gas mixer device, and at least one by pass line connected from a compressed gas supply line to said delivery line and having an automatic pressure operated shutoff valve therein responsive to a drop in pressure in said delivery line to feed gas through said by pass line to said delivery line whenever the pressure therein drops below a predetermined value, said at least one by pass line comprising a by pass line connected to each of said supply lines each having an automatically operable pressure operated shutoff valve.
Claim 3
Dependent Claim
30 words
A gas mixing apparatus according to claim 1, wherein said automatically operable pressure operated shutoff valve includes means for adjusting said valve to vary the pressure in which it opens.
Claim 4
Dependent Claim
18 words
Gas mixing apparatus, according to claim 1, wherein the opening pressures of said shutoff valves are set distinctly.
Claim 5
Dependent Claim
30 words
Gas mixing apparatus, according to claim 1, including a warning signal arrangement which indicates when the pressure drops below a definite pressure, is connected to said mixed gas delivery line.
Claim 6
Dependent Claim
20 words
Gas mixing apparatus according to claim 4, characterized in that the warning signal arrangement is an acoustic warning signal arrangement.
Claim 7
Dependent Claim
40 words
Gas mixing apparatus according to claim 5, including a signal conduit leading to the warning signal arrangement 10 having a shutoff signal valve which opens automatically when the pressure in the mixed gas delivery line drops below a predetermined pressure.
Claim 8
Dependent Claim
272 words
A gas mixing apparatus for gases under pressure, particularly for respirators and medical devices, comprising a gas mixer device, a plurality of compressed gas supply lines connected to said gas mixer device, at least one mixed gas delivery line extending out of said gas mixer device for the discharge of a mixture of gases from said compressed gas supply lines from said gas mixer device, and at least one by pass line connected from a compressed gas supply line to said delivery line and having an automatic pressure operated shutoff valve therein responsive to a drop in pressure in said delivery line to feed gas through said by pass line to said delivery line whenever the pressure therein drops below a predetermined value, said plurality of compressed air gas supply lines comprising two sets of supply lines said at least one by pass line including a by pass line connected to each separate supply line, each by pass line having a pressure operated shutoff valve including a valve housing having aa diaphragm extending thereacross, adjustable spring means biasing one side of said diaphragm, a movable valve member carried by the other side of said diaphragm, said other side of said diaphragm being connected to said by pass line, said by pass line having a valve seat which is closed by said movable valve member, said diaphragm being movable with said movable valve member upon the reduction of pressure in said delivery line to move said movable valve member off said valve seat and to communicate gas from said gas supply line through said by pass line to said mixed gas delivery line.
Claim 9
Dependent Claim
272 words
A gas mixing apparatus for gases under pressure, particularly for respirators and medical devices, comprising a gas mixer device, a plurality of compressed gas supply lines connected to said gas mixer device, at least one mixed gas delivery line extending out of said gas mixer device for the discharge of a mixture of gases from said compressed gas supply lines from said gas mixer device, and at least one by pass line connected from a compressed gas supply line to said delivery line and having an automatic pressure operated shutoff valve therein responsive to a drop in pressure in said delivery line to feed gas through said by pass line to said delivery line whenever the pressure therein drops below a predetermined value, said plurality of compressed air gas supply lines comprising two sets of supply lines said at least one by pass line including a by pass line connected to each separate supply line, each by pass line having a pressure operated shutoff valve including a valve housing having aa diaphragm extending thereacross, adjustable spring means biasing one side of said diaphragm, a movable valve member carried by the other side of said diaphragm, said other side of said diaphragm being connected to said by pass line, said by pass line having a valve seat which is closed by said movable valve member, said diaphragm being movable with said movable valve member upon the reduction of pressure in said delivery line to move said movable valve member off said valve seat and to communicate gas from said gas supply line through said by pass line to said mixed gas delivery line.
Claim 10
Dependent Claim
41 words
A mixing apparatus according to claim 7, including a warning signal connected in said by pass line having a movable diaphragm operated valve member which is openable by a reduction of pressure in said delivery line to actuate said warning signal.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |