Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1986-02-10
1987-09-08
Tolin, G. P.
Electricity: circuit makers and breakers
Fluid pressure
Piston
200 81R, 73745, H01H 3534
Patent
active
046925759
ABSTRACT:
A switch responsive to fluctuations in the level of a vacuum. A ball is contained in an upright chamber and is normally in contact with an actuating means in the chamber. The actuating means is normally biased to one position but is shifted by the weight of the ball to another position. The chamber is connected to the vacuum source so as to apply a lifting suction force to the ball. If the suction force exerted by the vacuum exceeds a predetermined level, the ball will be lifted from the actuating means thereby shifting the position of the actuating means and generating a signal indicative of the vacuum level. Means are provided to adjust the level of vacuum necessary to lift the ball from the actuating means.
REFERENCES:
patent: 2071042 (1937-02-01), Maurer
patent: 3639898 (1972-02-01), Booth
patent: 3933388 (1976-01-01), Conboy
patent: 4219710 (1980-08-01), Booth
patent: 4266905 (1981-05-01), Birk
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