Pneumatic valve

Details Pneumatic valve Pneumatic valve

1981-07-24

1984-10-30

Maslousky, Paul E.

Chairs and seats

Legrest or footrest interconnected to move relative to...

Common actuator controls vertical adjustment and relative...

91454, 91461, 91170R, 13759615, 251 634, F15B 13042

Patent

active

044796781

ABSTRACT:
A pneumatic valve is disclosed, for controlling the position of a ram in a partly-extended condition. The valve has a combination of rubbing seals and diaphragms, for smooth operation and reliability. A spring-loaded plunger presses the diaphragm against the mouth of a port, to seal off the port. A piston with rubbing seals lifts the plunger from the diaphragm, to open the port. The piston seals rub against plastic, for freedom from water contamination problems, while the diaphragm provides the high integrity seal needed to control the ram position. A particular application of the valve is to the air control of dentist's chair, medical table or medical chair.

REFERENCES:
patent: 2569881 (1951-10-01), Davies
patent: 3368845 (1968-02-01), Watanabe
patent: 3760843 (1973-09-01), Larner

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