US3749111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for mixing pressure gases particularly for respirators and medical devices
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1971-12-02
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Granted: 1973-07-31
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Expires: 1991-12-02
Abstract
Abstract Two gases are supplied to respective chambers, having fixed or adjustable preselected volumes, through respective first pressure regulators while maintaining the discharge pressures of the two first pressure regulators in such predetermined ratio. The flow of the two gases to the chambers is then interrupted, and the two gases are thereafter discharged from the respective chambers to a common discharge line through respective second pressure regulators while maintaining the discharge pressures of the two second pressure regulators in such predetermined ratio. The apparatus includes adjustable means for conjointly adjusting both the first and second pressure regulators so that the discharge ratios thereof are equal and equal to the predetermined ratio. A reversing valve may be used to connect the chambers to the first pressure regulators or to discharge the chambers through the second pressure regulators. A magnetically biased torsion resistant lever may be used to commonly bias the pressures of the first and second pressure regulators and also to adjust the respective pressure ratios. The respective first and second pressure regulators for each gas may be combined into a single unit.
Inventors
- 👤 G Dobritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:33
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/131; G05D11/132; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2559; Y10T137/2564
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
Apparatus for mixing two gases in a predetermined ratio, particularly for respirators and medical devices, comprising, in combination, respective chambers for the two gases; and pressure ratio regulator means and valve means connecting respective supply pipes for the gases to said chambers, and connecting said chambers to a common gas mixture discharge pipe; said pressure ratio regulator means coacting with said valve means to regulate the ratio of the pressure of the gases supplied from said supply pipes to said chambers and from said chambers to said common discharge pipe.
Claim 2
Dependent Claim
90 words
Apparatus for mixing two gases in a predetermined ratio, particularly for respirators and medical devices, comprising, in combination, respective chambers for the two gases; and pressure ratio regulator means and valve means connecting respective supply pipes for the gases to said chambers, and connecting said chambers to a common gas mixture discharge pipe; said pressure ratio regulator means coacting with said valve means to regulate the ratio of the pressure of the gases supplied from said supply pipes to said chambers and from said chambers to said common discharge pipe.
Claim 3
Dependent Claim
23 words
Apparatus as claimed in claim 1, in which said valve means are interposed between said pressure ratio regulator means and said respective chambers.
Claim 4
Dependent Claim
26 words
Apparatus as claimed in claim 1, including a storage tank interposed between said pressure ratio regulator means and valve means and said gas mixture discharge pipe.
Claim 5
Dependent Claim
33 words
Apparatus as claimed in claim 1, in which said chambers have the same volume, and in which the pressure ratio of said pressure ratio regulator means is directly proportional to said predetermined ratio.
Claim 6
Dependent Claim
17 words
Apparatus as claimed in claim 1, in which sAid valve means are constituted by a reversing valve.
Claim 7
Dependent Claim
63 words
Apparatus as claimed in claim 1, in which said gas supply pipes are connected to respective diaphragm controlled valves forming part of said pressure ratio regulator means, and having respective control diaphragms; a rocker arm interconnecting said control diaphragms; and a pivot bearing for said rocker arm adjustable therealong to adjust the ratio of the respective lever arms effective on said control diaphragms.
Claim 8
Dependent Claim
77 words
Apparatus as claimed in claim 6, including respective discharge lines connecting said chambers with respective diaphragm controlled valves forming part of said pressure ratio regulator means and having second control diaphragms; a second rocker arm interconnecting said second control diaphragms; and a second pivot bearing for said second rocker arm adjustable therealong to adjust the ratio of the respective lever arms effective on said second control diaphragms to the adjusted ratio of the first mentioned lever arms.
Claim 9
Dependent Claim
39 words
Apparatus as claimed in claim 7, including a connecting member interconnecting said pivot bearings and mounted for displacement longitudinally of said rocker arms; and a pointer on said connecting member operable to indicate the mixing ratio on a scale.
Claim 10
Dependent Claim
46 words
Apparatus as claimed in claim 6, in which said control diaphragms operate said valve means which include respective inlet and outlet valves; said control diaphragms, responsive to the pressure thereon exceeding a predetermined value, simultaneously closing the associated inlet valves and opening the associated outlet valves.
Claim 11
Dependent Claim
38 words
Apparatus as claimed in claim 9, in which the valve seats for said outlet valves are formed in the respective control diaphragms; said outlet valves being spring biased and having a limited movement in the valve closing direction.
Claim 12
Dependent Claim
39 words
Apparatus as claimed in claim 10, in which each of said inlet and outlet valves includes a movable valve member; the movable valve member of each outlet valve being connected with the movable valve member of each inlet valve.
Claim 13
Dependent Claim
35 words
Apparatus as claimed in claim 11, in which said control diaphragms, on their surfaces opposite to the surfaces subjected to the pressure of said chambers, are subjected to the pressure of said mixture discharge pipe.
Claim 14
Dependent Claim
48 words
Apparatus as claimed in claim 11, in which said control diaphragms are designed as dual diaphragms including inner and outer diaphragms interconnected by bridges; said outer diaphragms being subjected to external pressure; said outlet valves having discharge lines formed in the space between said inner and outer diaphragms.
Claim 15
Dependent Claim
72 words
Apparatus as claimed in claim 6, including a member mounting said rocker arm pivot bearing for displacement perpendicular to the plane of said control diaphragms; said member having a snap characteristic such that, when the pressure acting on said control diaphragms drops below an adjustable value, said member occupies one end position and, when the pressures acting on said control diaphragms exceed said adjustable value, said member occupies the other end position.
Claim 16
Dependent Claim
31 words
Apparatus as claimed in claim 14, in which said member is subjected to magnetic force moving it in one direction and to a spring force moving it in the opposite direction.
Claim 17
Dependent Claim
23 words
Apparatus as claimed in claim 15, in which said member comprises a torsion-resistant lever having said pivot bearing mounted at its free end.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |