초록 ▼

A dispenser for a product is described which incorporates a follower piston slidably mounted therewithin. The dispenser comprises 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

A dispenser for a product is described which incorporates a follower piston slidably mounted therewithin. The dispenser comprises 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.

대표청구항 ▼

An improved dispenser for a product, wherein the product is housed in an axially extending bore of a tubular container body having an upper end from which product is dispensed and an open lower end, said dispenser comprising a follower piston slidably mounted within said lower end of the bore of sai

An improved dispenser for a product, wherein the product is housed in an axially extending bore of a tubular container body having an upper end from which product is dispensed and an open lower end, said dispenser comprising a follower piston slidably mounted within said lower end of the bore of said body to support said product thereabove, said piston being constructed of resilient material and comprising a face portion adapted to contact the product and a peripherally attached sidewall which has at least one integral peripheral contact band conforming to the shape of the cross section of said bore, said sidewall being adapted to virtually resiliently longitudinally extend or contract in response to axial forces exerted on said face portion with such change in length resulting in an inversely proportional virtual change in lateral dimension of said peripheral contact band, said piston being hollow with the interior surfaces of said face and said sidewall exposed to atmospheric pressure, and said contact band dimensioned to provide an interference fit within the bore which exerts a predetermined normal force against the inner surfaces of said bore in static condition, whereby application of downward axial force on said piston face tends to virtually expand the lateral dimension of said peripheral contact band thereby increasing said normal force and proportionally increasing piston resistance to rearward displacement within said dispenser, and application of upward axial force on said piston face tends to virtually decrease the lateral dimension of said peripheral contact band thereby reducing said normal force and proportionally reducing piston resistance to upward displacement therein and permitting said follower piston to move upwardly within said dispenser while maintaining a seal with the inner surfaces of said bore.