Pressure responsive pump drive motor control apparatus having sp

Details Pressure responsive pump drive motor control apparatus having sp Pressure responsive pump drive motor control apparatus having sp

1983-10-13

1986-06-24

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 63, 340626, 307118, 318481, F04B 4906, F04B 2100, G08B 2100

Patent

active

045965145

ABSTRACT:
A pressure control apparatus, which can be used for a braking force magnification apparatus for a vehicle or a door closing and opening apparatus includes a sensor for sensing a pressure within a vacuum booster. The sensor is of a transfer-contact-type including a medial movable contact and two stationary contacts. The movable contact makes contact with one of the stationary contacts connected to an alarm lamp but breaks contact with the other connected through a control circuit to a DC motor connected to a vacuum pump or a compressor when the absolute gauge pressure produced by the vacuum pump or compressor is below a first predetermined threshold value. The movable contact breaks contact with the one stationary contact to energize the DC motor when the absolute gauge pressure is below a second predetermined threshold value but is above the first one. When the absolute gauge pressure is above the second predetermined threshold value, the movable contact makes contact with the other contact to deenergize the DC motor.

REFERENCES:
patent: 1952265 (1934-03-01), Leland
patent: 2042510 (1936-06-01), Cornelius et al.
patent: 2246932 (1941-06-01), Collins
patent: 2891625 (1959-06-01), Hube
patent: 3050003 (1962-08-01), Edwards
patent: 3469528 (1969-09-01), East
patent: 3738776 (1973-06-01), Debare
patent: 4049935 (1977-09-01), Gruber
patent: 4277226 (1981-07-01), Archibald
patent: 4309149 (1982-01-01), McCombs, Jr.

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