Patent ID: 8240513
Filing Date: 2012-08-14
Classification: B01F,F04B,G01F

Abstract:
1. A dispenser comprising: a chamber accommodating an inner displacement member nested within a bore disposed in an outer displacement member, the bore being in communication with the chamber, the inner displacement member being moveable between a retracted position and a dispensing position within the bore of the outer displacement member by a shaft, the shaft being coupled to the inner displacement member and the outer displacement member, both the inner and outer displacement members being slidable within the chamber, the outer displacement member being slidable between a retracted position and a dispense position, the shaft being arranged to move the outer displacement member into its dispensing position when the inner displacement member is in its dispensing position, a first spring member biasing the inner displacement member towards its retracted position, and a second spring member biasing the outer displacement member towards its retracted position.