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Discharge valving for a liquid dispensing pump having a reciprocable plunger is in the form of a laterally extending bunsen valve having an annular spring washer which resiliently bears against an annular valve seat adjacent the discharge opening. The loading of the valve is controlled by valve posi

Discharge valving for a liquid dispensing pump having a reciprocable plunger is in the form of a laterally extending bunsen valve having an annular spring washer which resiliently bears against an annular valve seat adjacent the discharge opening. The loading of the valve is controlled by valve positioning lugs between the top of the plunger and an overlying plunger head. The plunger may be immobilized in a fully raised position above the pump body or in a fully depressed position relative to the pump body by locking fingers positively deflected into and out of the path of reciprocation of a stop shoulder on the plunger head.

대표청구항 ▼

In a dispensing pump having a reciprocable plunger head mounted on a pump body member for the dispensing of product from a container upon plunger reciprocation, stop means on said head, a control member rotatably mounted on said body member and having an axial opening through which said stop means e

In a dispensing pump having a reciprocable plunger head mounted on a pump body member for the dispensing of product from a container upon plunger reciprocation, stop means on said head, a control member rotatably mounted on said body member and having an axial opening through which said stop means extends during plunger reciprocation, at least one upstanding locking finger being deflectable transversely to the axis of reciprocation of said plunger into the path of reciprocation of said stop means, the improvement wherein said locking finger is secured to said control member and has a downwardly facing stop shoulder located toward the lower end thereof, said stop means on said plunger head comprising an upwardly facing stop shoulder, opposing cam means on said body member in constant engagement respectively with opposing surfaces of said locking finger for positively deflecting said finger and said downwardly facing stop shoulder thereon transversely into as well as out of the path of said stop means, respectively, in response to relative rotary movement of said members, whereby said plunger head may be locked in a depressed position relative to said body member, and any tendency to inadvertently unlock said plunger head is prevented while any interference between said head and said finger during plunger reciprocation is avoided.