Patent ID: 6557736
Filing Date: 2003-05-06
Classification: B05B

Abstract:
A pump for dispensing fluids comprising:a piston-chamber forming member having a cylindrical chamber about a chamber axis, the chamber having a cylindrical axially extending chamber wall, a piston forming element received in the piston-chamber forming member axially slidable inwardly and outwardly therein; said piston forming element having a head disc and a base, the head disc disposed coaxially about a disc axis and extending radially outwardly to a sealing edge portion circumferentially thereabout, the head disc coupled to the base for tilting of the head disc between a first coaxial sealed orientation and a second tilted unsealed orientation, in the first sealed orientation, the head disc is orientated with its axis coaxial the chamber axis and the sealing edge portions engaging the chamber wall to prevent fluid flow therepast in a first direction, in the second unsealed orientation, the head disc is orientated with its axis at an angle relative the chamber axis and the sealing edge portion permitting fluid flow therepast in a second direction opposite to the first direction, the head disc assuming the sealed orientation on relative sliding of the piston forming member in the second direction, and the head disc assuming the unsealed orientation on relative sliding of the piston forming member in the first direction.