Failure detecting apparatus for a dual valve

Details Failure detecting apparatus for a dual valve Failure detecting apparatus for a dual valve

1978-11-13

1981-04-14

Husar, C. J.

192 clutches and power-stop control

Clutch and brake

19229B, F16D 6706, B60K 4124

Patent

active

042614503

ABSTRACT:
A failure detecting apparatus for a dual valve provided in a pneumatic circuit for a slide of a press machine, which comprises an air tank containing compressed air therein, a clutch and brake mechanism for the slide selectively connectible with the air tank, a pair of solenoid valves connected in parallel with the air tank and the clutch and brake mechanism, each of the solenoid valves having two positions wherein the clutch and brake mechanism is connected to atmosphere when the solenoid valve is at first position and is connected to the air tank when the solenoid valve is at second position, and a pressure operated switch interposed between the solenoid valves and the clutch and brake mechanism wherein the pressure operated switch is adapted to be turned on and off for each cycle of the slide when both solenoid valves are in good working order.

REFERENCES:
patent: 2722298 (1955-11-01), Munschauer
patent: 3865218 (1975-02-01), Jones, Jr.
patent: 4072222 (1978-02-01), Coon et al.
patent: 4138005 (1979-02-01), Schneider et al.

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