Pneumatic timer

Details Pneumatic timer Pneumatic timer

1975-05-05

1977-04-19

Scott, James R.

Electricity: circuit makers and breakers

Retarded

Dashpot

267114, H01H 703, F16F 1500

Patent

active

040190013

ABSTRACT:
A pneumatic timer is constructed by stacking a calibration subassembly on top of a diaphragm housing stacked above a diaphragm subassembly, and including a filter capsule subassembly interposed between the calibration subassembly and the diaphragm housing. The filter capsule subassembly includes a check valve disposed within a recess so constructed that all air entering the recess must pass through filter screens disposed on opposite sides of the check valve. The biasing spring for the check valve bears against one of the screens and biases the movable valve member to a normal position bearing against the other screen. The second screen is flexible so that at the end of the reset stroke the plunger attached to the timing chamber diaphragm mechanically opens the check valve.

REFERENCES:
patent: 2662594 (1953-12-01), Schaefer
patent: 2996155 (1961-08-01), Priesemuth
patent: 3578767 (1971-05-01), Lee
patent: 3599419 (1971-08-01), Anderson
patent: 3912247 (1975-10-01), Ward

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