Source of vacuum and device for maintaining a negative pressure

Details Source of vacuum and device for maintaining a negative pressure Source of vacuum and device for maintaining a negative pressure

1978-11-02

1981-09-08

Smith, Leonard E.

Foods and beverages: apparatus

Subjecting food to an enclosed modified atmosphere

Vacuum-producing means

73731, 116DIG9, 128278, 128297, 128765, 141 65, 215230, 215260, 215311, 215365, 417437, 417555R, A61M 100, B65B 3104, B65D 8120, F04B 2100

Patent

active

042878195

ABSTRACT:
The source of vacuum comprises a tubular body in which a piston which is combined with a piston rod is axially slidable. A seal is interposed between the rod and the body where the rod extends out of the body. A suction orifice is provided which is on the axis of or in the vicinity of the axis of the body and parallel to the axis. An arrangement is provided for holding the body and urging the piston to one end of the body in one hand. A communication passage is provided for putting the suction orifice in communication with a chamber defined between the piston and the body when the piston is depressed relative to the body.

REFERENCES:
patent: 578410 (1897-03-01), Lord
patent: 1556981 (1925-10-01), Voight
patent: 2436849 (1948-03-01), Billetter
patent: 3135411 (1964-06-01), Osborne
patent: 3452708 (1969-07-01), Richardson
patent: 3800780 (1974-04-01), Elliott
patent: 3980082 (1976-09-01), Miller

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