Quick-change fluid section for piston-type paint pumps

In a piston pump of the type having driving means carried in a drive housing and coupled to a double acting piston axially reciprocable in a fluid section housing, an improved fluid section coupling and mounting apparatus comprising:

• a) a fluid section mounting flange having
• i) a first end carrying a threaded axial bore for engagement with a threaded end of a fluid section housing,
• ii) a second end having a radially outwardly directed lip having a plurality of keyhole-shaped axially-oriented apertures therethrough, and
• iii) an elongated generally cylindrical wall section between said first and second ends having diametrically opposed radially-oriented apertures therethrough;
• b) a reciprocable coupling means for connecting the driving means to the piston to reciprocate the piston with respect to the housing, the coupling means comprising:
• i) an axially oriented cylindrical section of the driving means having both axial and diametral bores therein,
• ii) an axially projecting extension at a first end of the piston and having a diametral bore therethrough,
• iii) a connecting pin simultaneously transversely received in the diametral bores of the cylindrical section of the driving means and the piston extension such that when the piston extension is received in the axial bore of the cylindrical section such that the driving means is coupled to the piston for bidirectional reciprocation, and
• iv) pin retaining means for retaining the connecting pin in the diametral bores.