Patent ID: 7070581
Filing Date: 2006-07-04
Classification: A61J,A61M,B29C,B29L

Abstract:
1. A dispenser assembly for liquid products comprising an elongated, generally cylindrical barrel having a body portion provided with a base of a predetermined internal cross-sectional diameter and having a discharge opening at one end and open at its opposite end, an elongated, generally cylindrical hollow plunger having a tip portion and an outer diameter less than the barrel internal diameter, a circumferentially extending, axially directed flexible sealing lip adjacent the tip portion, said sealing lip having an outer diameter greater than the internal diameter of the barrel in the relaxed state, whereby the lip is flexed inwardly against its bias and providing the sole sliding contact between the plunger and barrel when the plunger and barrel are actuated axially relative to one another; the bore of said body portion having a predetermined generally uniform diameter and an outwardly flared portion adjacent the open end of said barrel, said flared portion having a maximum diameter slightly greater than the flexible sealing lip in the relaxed state, to thereby facilitate easy assembly, and a radially inwardly directed bead integrally formed with the body portion at the juncture of the bore of the body portion and flared portion, whereby when the plunger is drawn to its outer-limit position, the sealing lip engages the bead to indicate to the user not to withdraw the plunger any further.