Pneumatic timer

Details Pneumatic timer Pneumatic timer

1976-12-07

1978-08-01

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Retarded or delayed type

335 59, H01H 703

Patent

active

041046021

ABSTRACT:
A pneumatic timer is disclosed which includes a base plate, a vertical frame member consisting of a frame perpendicular to the base plate and a horizontal frame. The horizontal frame portion includes a central opening, the vertical frame portion includes a pair of vertically extending grooves. A timing mechanism is received in the central opening in the horizontal frame portion including a displaceable element displaceable axially of the central opening in the base plate and a knob disposed on top of the horizontal frame portion. An electromagnet is fixed inside the vertical frame portion in a region surrounded with the horizontal and vertical frame portions. The electromagnet includes a plunger which has a connecting rod associated therewith and which is vertically movable in response to an input signal and is arranged so that in the normal condition it holds the displaceable element in its initial position but that upon energization of the electromagnet it allows vertically downward displacement of the displaceable element. Each of the pair of grooves in the vertical frame portion includes one of the two arms of a T-shaped lever received in the upper region thereof.

REFERENCES:
patent: 1604669 (1926-10-01), Valkenburg
patent: 2855481 (1958-10-01), Lindahl
patent: 3684985 (1972-08-01), Flanagan
patent: 3711797 (1973-01-01), Flanagan et al.
patent: 3775710 (1973-11-01), Cook
patent: 4030054 (1977-06-01), Kiessling

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