Patent ID: 7318539

Claim:
In a motor operated sprayer for a fluid supply container comprising a discharge opening, a variable volume pump having a pump axis and having axially spaced apart fixed and movable ends, said fixed end being in flow communication with said discharge opening, an inlet for connecting said pump with fluid in a supply container, an outlet for connecting said pump with said discharge opening, an electric motor, a cam rotatably driven by said motor, and a cam follower for displacing said movable end of said pump, whereby rotation of said cam axially displaces said movable end toward and away from said fixed end for pumping fluid from said container through said outlet and discharge opening, the improvement comprising said cam and said cam follower having interengaging cam faces for balancing lateral forces therebetween during rotation of said cam relative to said cam follower, said cam and said cam follower having an axis, each of said cam and said cam follower including a first cam face in a first plane intersecting the corresponding axis at a first angle thereto, and a second cam face in a second plane intersecting said first plane at a second angle thereto.