Warning means for a safety valve of a hydraulic power unit and a

Details Warning means for a safety valve of a hydraulic power unit and a Warning means for a safety valve of a hydraulic power unit and a

1981-12-09

1985-08-06

Trafton, David L.

Communications: electrical

Condition responsive indicating system

Specific condition

137557, 25112904, 340611, G08B 2100

Patent

active

045339082

ABSTRACT:
A warning means for a safety valve of a hydraulic power unit and a hydraulic power unit having the same for use in a lifting jack, a vehicle lift, or the like, are disclosed. When an overload is given to a cylinder chamber of a hydraulic power unit, a safety valve is automatically opened so as to release an oil in the overloaded cylinder chamber back to an oil tank. When the safety valve is opened, a warning means switches on a caution buzzer and a caution lamp to appeal the overload to the senses of eyesight and hearing of a human being in order to prevent an accident to be followed previously. The warning means comprises a reed switch and a magnet adapted to be moved by the oil passed through the safety valve.

REFERENCES:
patent: 3551620 (1970-12-01), Hoover
patent: 4166936 (1979-09-01), Tice
patent: 4181835 (1980-01-01), Stadler et al.
patent: 4366837 (1983-01-01), Roettgen
patent: 4417236 (1983-11-01), Hung

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