Fluid control for electrical circuit

Details Fluid control for electrical circuit Fluid control for electrical circuit

1976-09-15

1978-05-23

Swann, III, Glen R.

Communications: electrical

Systems

Call station

200 814, 200 86A, 340 39, G08B 2100, G08B 2900

Patent

active

040913708

ABSTRACT:
A pneumatically-operated bell, such as is commonly used in service stations, has twin pneumatic hoses. The first is a conventional signal hose, actuating the bell when compressed. The second hose is laid parallel to the first and, when compressed, prevents actuation of the bell by the first hose for a predetermined period. In a first embodiment, the second hose opens a switch in the bell's electric circuit. In a second embodiment, the second hose actuates a valve to block air flow through the first hose to prevent its actuating the bell. As a result, vehicles exiting the service station compress the second hose first and thus no signal is produced, while vehicles entering the station produce a signal only when the front wheels cross the hoses. Thus false signals from exiting vehicles and false double signals are prevented.

REFERENCES:
patent: 2931010 (1960-03-01), Geiser
patent: 3950725 (1976-04-01), Kitajima

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