Fluid handling – Systems – Programmer or timer
Patent
1978-01-25
1979-09-11
Cohan, Alan
Fluid handling
Systems
Programmer or timer
137 82, 92 76, G05D 1600
Patent
active
041671996
ABSTRACT:
This invention relates to timing devices for pneumatic signals, of the kind comprising a pneumatic motor having gearing which is brought into coupled engagement with a timer when an input signal occurs so that a control member associated with the timer, which can be set for a desired delay between the input signal and an output signal, is moved from an initial position which determines the length of delay to a terminal position which marks the end of the delay and at which the output signal is produced.
The invention consists in that a pivotable control lever is held in an initial position by means of an adjustable support and is pivotable, an occurrence of an input signal, to an intermediate position by movement of said support so that a pawl on said control lever may be allowed to come up against a track on said control member, said control member being settable in motion by said motor at the same time and in that to end the delay, said pawl drops into a recess which interrupts said track on said control member thus to break the coupled engagement, to lock said control member and to release the output signal by said control layer which pivots to its terminal position, and in that when the input signal stops, said support returns said control lever to its initial position, after releasing said locking, so that said control member can return to it initial position under the prompting of a return spring.
REFERENCES:
patent: 3931832 (1976-01-01), Holder
patent: 4090531 (1978-05-01), Laviana
Cohan Alan
H. Kuhnke Elektrotechnik GmbH
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