Patent ID: 7959037
Filing Date: 2011-06-14
Classification: B05B

Abstract:
1. A pump for dispensing fluids comprising: a piston-chamber forming member having a chamber about a chamber axis, the chamber having a chamber wall, an inner end, an open outer end, an outlet and an inlet, a piston forming element received in the piston-chamber forming member axially slidable inwardly and outwardly therein between an extended position and a retracted position in cyclical operation of the pump to draw fluid into the chamber via the inlet and dispense fluid via the outlet, the piston forming element having: the intermediate portion being capable of being severed such that severing of the intermediate portion severs the inner portion from the outer portion; the piston forming element further having a piston catch member, a chamber catch member carried by the a piston-chamber forming member engaging the piston catch member when the piston forming element is moved relative the piston-chamber forming member and preventing movement of the piston catch member past the chamber catch member under forces applied to the outer portion which are equal to or greater than forces required to sever the intermediate portion.