US3950946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum producing system
Assignee: Aisan Industry Co Ltd
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Filing: 1975-03-04
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Granted: 1976-04-20
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Expires: 1995-03-04
Abstract
Abstract A control system for a diaphragm vacuum pump comprises a vacuum sensor disposed within the vacuum chamber of a pneumatically operated device for detecting a predetermined vacuum pressure to ensure the effective operation of the device and generating an output signal therefrom. A switchover solenoid valve is disposed within the pneumatic connection between the suction port of the vacuum pump and the vacuum chamber of the device is energized in response to the output signal of the sensor to selectively open the pumping chamber of the pump to the air through the suction port and close the vacuum chamber of the device.
Inventors
- 👤 Toshimitsu Sakai
- 👤 Isamu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:40
CPC Classifications
F; F04; F04B; F04B41/00; B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; F04B45/00; F04B45/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
In a control system for a diaphragm vacuum pump drivingly connected to a power source to ensure operation of a pneumatically operated device, the improvement comprising, a vacuum sensor in communication with the vacuum chamber of said device for detecting a predetermined vacuum pressure to ensure the operation of said device and generating an output signal therefrom, means for pneumatically connecting the suction port of said pump to said vacuum chamber of said device, and a switchover means disposed within said pneumatic connection between said suction port and said vacuum chamber to be activated in response to said output signal from said sensor to selectively open the pumping chamber of said pump to the air through said suction port and close said vacuum chamber of said device.
Claim 2
Dependent Claim
127 words
In a control system for a diaphragm vacuum pump drivingly connected to a power source to ensure operation of a pneumatically operated device, the improvement comprising, a vacuum sensor in communication with the vacuum chamber of said device for detecting a predetermined vacuum pressure to ensure the operation of said device and generating an output signal therefrom, means for pneumatically connecting the suction port of said pump to said vacuum chamber of said device, and a switchover means disposed within said pneumatic connection between said suction port and said vacuum chamber to be activated in response to said output signal from said sensor to selectively open the pumping chamber of said pump to the air through said suction port and close said vacuum chamber of said device.
Claim 3
Dependent Claim
26 words
A control system for a diaphragm vacuum pump as claimed in claim 1, wherein the exhaust port of said vacuum pump is connected to the air.
Claim 4
Dependent Claim
39 words
A control system for a diaphragm vacuum pump as claimed in claim 1, wherein said power source is an engine of a vehicle and said vacuum pump is connected at its exhaust port to an intake-manifold of said engine.
Claim 5
Dependent Claim
102 words
A control system for a diaphragm vacuum pump as claimed in claim 3, wherein the driving connection between said power source and a spring loaded diaphragm piston of said vacuum pump is detachable and a second switchover means is disposed within the pneumatic connection between said exhaust port of said vacuum pump and said intake-manifold to be activated in response to said output signal from said sensor to selectively close said exhaust port, whereby upon activation of said second switchover means, said diaphragm piston is separated from said power source due to positive pressure exerted within the pumping chamber of said pump.
Claim 6
Dependent Claim
48 words
A control system for a diaphragm vacuum pump as claimed in claim 1, wherein a vacuum reservoir is disposed within said pneumatic connection between said switchover means and said vacuum chamber of said device to store vacuum pressure therein so as to ensure the operation of said device.
Claim 7
Dependent Claim
32 words
A control system for a diaphragm vacuum pump as claimed in claim 1, wherein said switchover means is a switchover solenoid valve to be energized by said output signal of said sensor.
References Cited (Backward Citations)
US2142514A
Cited
US3006535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |