Abstract: A plural component pumping apparatus including a piston and cylinder for each component to be pumped. Reciprocation of the piston in the cylinder draws the component into the cylinder during an intake stroke of the pumping apparatus and exhausts the material from the cylinder during an exhaust stroke of the pumping apparatus. Intake and exhaust valves are provided into the cylinder. Each of the intake and exhaust valve includes a housing oriented outside the cylinder to facilitate repair or replacement of the valves. A pumping motor on each side of the cylinder is coupled to a support and to the piston to move the support and piston relatively toward each other during the exhaust stroke and relatively away from each other during the intake stroke. A position indicator is coupled to the pumping motor. The pumping motor controls sense the position of the position indicator.

Abstract: A hand held paint spray gun having a top mounted paint cup which extends from the rear of a gun body at an angle of 30.degree..+-.10.degree. to an axis about which the atomized paint is discharged. A retainer ring secures a lid on the cup. The lid seals to both the inside and the outside of the cup. The double seals reduce the risk of paint leakage. Preferably, the gun operates with suction paint feed which is augmented by gravity feed when paint in the cup is located above a nozzle assembly on the gun. To facilitate cleaning and to allow the gun to spray in an upward direction, the paint may be sealed in a collapsible closed bag located in the cup. With the closed bag and the suction feed, the gun will operate when aimed in all directions. The gun is easily cleaned by forcing solvent from the nozzle assembly back into the bag and disposing of the bag containing any remaining paint and the used solvent.

Abstract: A reciprocating piston compressor of the type having the piston fixed to the connecting rod. The centerline of the cylinder is offset from the centerline of the crankshaft in a direction which reduces the maximum angle between the piston and the cylinder axis during the compression stroke. The offset reduces the maximum side loading on the piston to in turn reduce piston seal wear.