Flexible membrane discharge for vacuum hopper

Details Flexible membrane discharge for vacuum hopper Flexible membrane discharge for vacuum hopper

1977-01-03

1978-03-28

Reeves, Robert B.

Dispensing

Jarring and/or vibrating

Supply container wall flexing

302 21, B65G 6572

Patent

active

040811107

ABSTRACT:
A vacuum storage hopper for storing and dispensing granular materials, including a storage chamber having a lower inverted conical discharge section terminating in a discharge valve. At least one material inlet and a combination air inlet-outlet are connected to the upper part of the storage chamber. A source of air under vacuum and pressure is connected to the air inlet-outlet for exhausting air from the storage chamber to draw granular material thereinto, and for supplying air under pressure to the storage chamber to assist the discharge of granular material from the hopper. A flexible, resilient air-impervious membrane of inverted generally conical configuration is located in the discharge section of the hopper; the membrane has its upper edge secured to the upper edge of the discharge section of the hopper and hangs downwardly therefrom. A short strip of the membrane, no more than a minor fraction of its circumference, is secured to the storage chamber below its upper edge. A port in the discharge section of the storage chamber is used to introduce air under pressure between the wall of the storage chamber and the membrane at a point above the strip of membrane and below its upper edge.

REFERENCES:
patent: 2792262 (1957-05-01), Hathorn
patent: 3620575 (1971-11-01), McIver et al.
patent: 3841530 (1974-10-01), Janninck
patent: 4005908 (1977-02-01), Freeman

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