US3797512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum reducer valve
Assignee: ACUSTAR Inc A CORP OF
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Filing: 1973-03-14
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Granted: 1974-03-19
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Expires: 1993-03-14
Abstract
Abstract A three-chamber vacuum reducer valve is used in the distributor spark advance control system to provide a source of vacuum for advancing the spark firing during engine overheat conditions. The source of vacuum is greater than the ported spark vacuum found upstream of the throttle plate in a carburetor intake and less than the manifold vacuum. One input to the reducer is the manifold vacuum and the other input is atmospheric pressure which are combined by means of a regulator in the valve for producing an output vacuum which is reduced from the manifold vacuum.
Inventors
- 👤 F Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:40
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607; Y10T137/261
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
288 words
A vacuum reducer valve for regulating the vacuum supplied to a vacuum motor within a predetermined vacuum differential of a vacuum source, said reducer comprising: a first chamber having an input port for connection to a source of atmospheric pressure and an output port; a second chamber having an input port connected to the output port of said first chamber and having an output port for connection to a utilization means; a third chamber having an input port for connection to a source of vacuum pressure; a flexible diaphragm having a centrally located flow passageway integral with a valve seat, said diaphragm sealingly separating said second and third chambers whereby said flow passageway provides for fluid communication between said second and third chambers; stop means located in said second chamber for locating said diaphragm in a first position; a dump valve located in said first chamber and extending through said output port of said first chamber and biased into contact with said valve seat in said diaphragm, said dump valve responsive to the source of atmospheric pressure connected to said input port of said first chamber for moving said diaphragm from said first position closing said flow passageway therein and fluidly interconnecting said first and second chambers to a second position for closing the output port of said first chamber and before opening said flow passageway and fluidly interconnecting said second and third chambers; and regulating means located in said third chamber and connected to said diaphragm responding to said vacuum source to modulate said diaphragm thereby opening and closing said flow passageway therein for maintaining the vacuum level in said second chamber within a predetermined vacuum differential less than the vacuum source connected to said third chamber.
Claim 2
Dependent Claim
288 words
A vacuum reducer valve for regulating the vacuum supplied to a vacuum motor within a predetermined vacuum differential of a vacuum source, said reducer comprising: a first chamber having an input port for connection to a source of atmospheric pressure and an output port; a second chamber having an input port connected to the output port of said first chamber and having an output port for connection to a utilization means; a third chamber having an input port for connection to a source of vacuum pressure; a flexible diaphragm having a centrally located flow passageway integral with a valve seat, said diaphragm sealingly separating said second and third chambers whereby said flow passageway provides for fluid communication between said second and third chambers; stop means located in said second chamber for locating said diaphragm in a first position; a dump valve located in said first chamber and extending through said output port of said first chamber and biased into contact with said valve seat in said diaphragm, said dump valve responsive to the source of atmospheric pressure connected to said input port of said first chamber for moving said diaphragm from said first position closing said flow passageway therein and fluidly interconnecting said first and second chambers to a second position for closing the output port of said first chamber and before opening said flow passageway and fluidly interconnecting said second and third chambers; and regulating means located in said third chamber and connected to said diaphragm responding to said vacuum source to modulate said diaphragm thereby opening and closing said flow passageway therein for maintaining the vacuum level in said second chamber within a predetermined vacuum differential less than the vacuum source connected to said third chamber.
Claim 3
Dependent Claim
44 words
A vacuum reducer valve according to claim 1 wherein said regulating means is a compression spring calibrated at its working length to maintain the vacuum level in said second chamber at a predetermined vacuum differential less than the vacuum source in said third chamber.
Claim 4
Dependent Claim
34 words
A vacuum reducer valve according to claim 1 additionally including a second set of stop means located around the input port of said third chamber for preventing said diaphragm from sealing said input port.
Claim 5
Dependent Claim
23 words
A vacuum reducer valve according to claim 1 wherein said first, second and third chambers are integrally connected forming a unitary valve body.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |