Patent ID: 8074844

Claim:
A pump for dispensing fluids from a reservoir comprising: a piston-chamber forming member having a cylindrical chamber about a central axis, said chamber having a chamber wall, an inner end in fluid communication with the reservoir and an outer open end, a piston forming element having a piston portion coaxially slidably received in the chamber with an outer portion of the piston forming element extending outwardly from the open end of the chamber, the outer portion including a hollow discharge tube extending generally radially outwardly from the central axis from an inlet end to a discharge outlet, the piston portion being generally, cylindrical in cross-section with a central axially extending hollow stem having a central passageway with an inner end opening into the chamber and an outer end communicating with the inlet end of the hollow discharge tube, an axially outwardly directed stroke stop surface fixedly relative to the piston-chamber forming member, a stroke stop member carried on the discharge tube for engagement with the stroke stop surface to limit inward coaxial sliding of the piston forming element relative the piston-chamber forming member, the stroke stop member journalled on the discharge tube for pivoting about a radial axis extending radially from the central axis between a first rotational position and a second rotational position, in the first rotational position the stroke stop member engaging the stroke stop surface to limit inward coaxial sliding of the piston forming element relative the piston-chamber forming member at a first axial location, in the second rotational position the stroke stop member engaging the stroke stop surface to limit inward coaxial sliding of the piston forming element relative the piston-chamber forming member at a second axial location which is different than the first axial location, wherein reciprocal sliding of the piston forming element relative the piston-chamber forming member dispensing fluid from the reservoir out the discharge outlet the radial axis is normal to the central axis, the discharge tube has an outer surface cylindrical about the radial axis, the stroke stop member having a bore therethrough to receive the discharge tube coaxially therein, and the bore having journalling surfaces engaging said outer surface of the discharge tube at least over 180 degrees about the radial axis.