Method and apparatus for evacuating air from food containers

Details Method and apparatus for evacuating air from food containers Method and apparatus for evacuating air from food containers

1986-10-22

1988-05-24

Coan, James F.

Package making

Methods

Gas filling and/or evacuating and closing

53101, 53434, 53512, 141 65, B65B 3104

Patent

active

047457309

ABSTRACT:
An evacuating pump has a hollow cylindrical body, a cap at one end of the body, and a nozzle at the opposite end. A plunger disposed within the body has a piston attached to an inner end of a reciprocating rod, while the outer end of the rod extends through a bore provided in the cap. When the plunger is withdrawn, a vacuum is created at the nozzle, while on the inward stroke, a check valve flap seats over the nozzle inlet to prevent air from being injected through the nozzle. Air being compressed on the inward stroke escapes around the peripheral edge of the piston.

REFERENCES:
patent: 2695741 (1954-11-01), Haley
patent: 3175590 (1965-03-01), Belknap
patent: 3307319 (1967-03-01), Christensen et al.
patent: 3312256 (1967-04-01), Reisinger
patent: 3452510 (1969-07-01), Fry
patent: 3511020 (1970-05-01), Kraft et al.
patent: 3648740 (1972-03-01), Pruitt
patent: 3672114 (1972-06-01), Sacks
patent: 3834118 (1974-09-01), Waldrop et al.
patent: 4249583 (1981-02-01), Lundbladh

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