Automatic lock for two mode piston pump

A lock assembly for a two mode piston pump comprising

• a pump housing including a cylinder,
• a piston mounted for reciprocal movement within said cylinder, and
• a piston rod fixed to said piston and extending out of said pump housing for reciprocal movement to operate said piston,
• wherein said assembly comprises:
• a connecting link pivotally connected to said piston rod,
• lever means pivotally mounted on said pump housing,
• cam means, having a cylindrical outer surface, rotatably mounted in said connecting link for effecting reciprocal movement of said connecting link,
• cam shaft means fixed, off-center, to said cam means and rotatably mounted within said lever means,
• said cam shaft means having an axial passage with a square cross-section for engagement by a power tool square drive shaft,
• a cam locking means for locking said cam shaft means to said lever means for operation of said pump by pivotal movement of said lever means with respect to said pump housing,
• said cam locking means comprising a shaft portion adapted to be insertable in said cam shaft means axial passage, and a head portion fixed to said shaft portion,
• said cam locking means shaft portion having a first position in said axial passage in which said cam shaft means is locked to said lever means and a second position in said axial passage in which said cam shaft means is unlocked, and
• a lever locking means for locking said lever means to said pump housing.