Three-part press type seal

Claim 1

A locally distortable closure member contractably and distensibly constructed and having an elastic memory such that it is adapted to hermetically seal an open-mouthed container and comprising: a. a center main wall including a biased area radially emanating from a central portion thereof to a peripheral terminus, said center main wall being adapted for the application of pressure to the approximate center thereof in such manner that said biased area tends to collapse upon itself and substantially uniformly displace said peripheral terminus until said closure is easily positionable in an open-mouthed container; b. integral extended sealing means positioned around said peripheral terminus of the center main wall, said sealing means being displaceable in like manner with said peripheral terminus such that at least a portion of said sealing means is closely engageable with and sealable against the walls of an openmouthed container due to the resiliency and elastic memory of said closure upon the discontinuance of applied pressure to said center main wall; c. a closure top wall interconnected with said integral extended sealing means and said center main wall, said closure top wall further including an integral and substantially centered upstanding bushing-like guide terminating at its upper extremity in a finger grippable flange; and, d. an axially movable plunger positioned in said guide in such manner as to have a portion thereof exposed above said flange so that pressure applied to the plunger is transmitted to the approximate center of said center main wall.