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(11) | EP 0 140 445 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Follower device for dispensing package |
(57) A dispenser for a product is described which incorporates a follower piston slidably
mounted therewithin. The dispenser includes an axially extending bore of a tubular
container body for housing a product to be dispensed and having an upper end from
which the product is dispensed and an open lower end. The follower piston is slidably
mounted within the lower end of the bore of the container body to support the product
thereabove. The piston is constructed of resilient material and comprises a face portion
adapted to contact the product and a peripherally attached sidewall. The sidewall
further comprises at least one integral peripheral contact band conforming to the
shape of the cross section of the bore, and is adapted to virtually resiliently extend
or contract in response to axial forces exerted on the face portion with such change
in length resulting in an inversely proportional virtual change in lateral dimension
of the peripheral contact band. The peripheral contact band is dimensioned to provide
an interference fit within the bore which exerts a predetermined normal force against
the inner surfaces of the bore in static condition. |