Patent ID: 7748574

Claim:
A dispenser for flowable materials comprising: a support member, an actuator member reciprocally movable relative to the support member between an extended position and a retracted position to dispense flowable material, a spring mechanism comprising a spring member biasing the actuator member to one of the extended position and the retracted position, the spring member comprising an elongate cantilevered spring member extending along a longitudinal from a first proximal end to a second distal end, wherein either: (a) the first proximal end is coupled to the support member and the second distal end engaging the actuator member, or (b) the second distal end is coupled to the actuator member and the first proximal end engaging the support member, wherein the spring member having an unbiased condition and being resiliently deflectable generally normal to its longitudinal to deflected conditions from which the spring member inherently attempts to return to its unbiased condition, the longitudinal of the spring member remaining disposed in a flat plane in deflecting between the unbiased condition and the deflected conditions, the spring member comprising a pair of spaced leg members joined by a central bight, the spring member having in cross-section normal to its longitudinal a U-shape with the leg members spaced from each other and with the bight extending between the leg members normal to the flat plane.