Follower piston for e.g. pharmacy field, has anti-return units preventing displacement of piston inside shaft of fluid product tank in response to overpressure in tank, and formed with sealing lip in monoblock manner

摘要

#CMT# #/CMT# The piston (P) has a sealing lip (11) that slides inside a shaft (2) of a fluid product tank (R) in a sealed manner, and anti-return units for preventing displacement of the piston inside the shaft in response to an overpressure in the tank. The anti-return units are formed with the sealing lip in a monoblock manner, and constituted of a locking ring (13), a flexible membrane (14), a flexible skirt (15) and an annular locking ridge (16). #CMT#USE : #/CMT# Follower piston for use in a fluid product tank of a fluid product distributor (all claimed) in perfumery, cosmetic or pharmacy fields, where the distributor is utilized distributing viscous fluid product e.g. cream, ointment, paste, gel, toothpaste or pomade. #CMT#ADVANTAGE : #/CMT# The anti-return units formed with the sealing lip in a monoblock manner is aesthetic, reliable, light, easily recyclable, and easily adaptable to different distributors. The anti-return units eliminates the need for any pre-assembly and utilization of costly material e.g. spring steel, thus simplifying assembling of the piston and reducing manufacturing cost. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a vertical cross sectional view of a fluid product distributor in a rest position. P : Follower piston R : Fluid product tank 2 : Shaft 11 : Sealing lip 13 : Locking ring 14 : Flexible membrane 15 : Flexible skirt 16 : Annular locking ridge.