Cutlery
Patent
1977-01-25
1978-09-05
Stoner, Jr., Bruce H.
Cutlery
2221445, 302 27, B65G 5336
Patent
active
041114922
ABSTRACT:
A pneumatic conveying system for a granular, powdery, or liquid product which utilizes during normal operation pressure differentials to convey and to regulate the flow of product through the system. A high velocity stream of air creates a pressure differential between a main pipeline and a product chute elbow to thereby suck the product into the stream of air. The system includes a pair of tank chambers so that the product may be fed alternatively from the two tank chambers into the product chute elbow. The tank chambers may be of sufficiently small size so that switching from tank to tank occurs less than two minutes apart preferably in the range of from about one minute to one second. Each tank chamber includes outlet and inlet openings which are pressure operated. The switching is controlled by introduction of air into one tank at a time which simultaneously closes the product inlet opening into the tank and opens the outlet opening. The product outlet openings may both be closed simultaneously by abnormal pressure differentials created by a blockage of the flow of product in the pipeline. The closure of both product outlet valves prevents further feed of product to the main pipeline and also prevents a blowback of product into the system. A suction pump can be connected to each tank chamber to draw product into one tank to fill such tank while the other tank is being emptied.
REFERENCES:
patent: 267318 (1882-11-01), Beach
patent: 1053014 (1913-02-01), Cron
patent: 2971679 (1961-02-01), Pavia
patent: 3424501 (1969-01-01), Young
Nase Jeffrey V.
Stoner Jr. Bruce H.
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