NZ505468A - Dispensing apparatus torsion spring adjustment on handle - Google Patents

Abstract

Dispensing apparatus of a kind having a squeezing handle assembly which comprises or includes first and second handle components pivoted relative to each other on a pivot axis to move upon a squeezing together of such components, against a spring return bias to cause, in use, a piston discharge of a fluid from the barrel thereof, and to move, upon at least partial release of the squeeze on the handle, to cause a piston retraction. Wherein the spring is a torsion spring having first and second arms each defined by an end of a coil, the coil being located by a pivot providing pin for the handle components that passes on the pivot axis through the spring coil with the second arm of the spring bearing on the second handle component and the first arm of the spring bearing on an adjacent mechanism carried by the first handle components, the adjacent mechanism enabling by movement of the first arm of the spring relative to the first component a change to the return bias provided by the torsion spring for the squeezable handle (6).