B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
222/79
B65D 83/00 (2006.01)
Patent
CA 1092561
ABSTRACT OF THE DISCLOSURE The invention relates to a plunger for use in excluding air from a container and especially from a cartridge dispenser. The invention comprises a plunger adapted to be inserted into a tube and having a leading face which may be inserted by a predetermined distance into the tube before forming a seal therewith. After insertion of the leading face by the predetermined distance, the plunger forms an air tight seal with the tube. The plunger is insertable into the tube by a further distance beyond the predetermined distance without reduction in the volume thereby contained. In preferred embodiments the means enabling insertion of the plunger to a distance before a seal results comprises one or more grooves extending along the plunger side wall from the leading face towards a trailing edge but stopping short thereof. The preferred means enabling a further insertion without reduction in volume contained comprise a membrane integral with the leading face which is deformable in a trailing direction. When inserted in a cartridge dispenser means may be provided whereby movement of the plunger in a trailing direction beyond a predetermined position may be prevented thereby maintaining the seal while permitting dispensation of contents. -1-
327040
Lajovic Dusan S.
Stewart & Kolash Ltd
LandOfFree
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