Metering pump

Details Metering pump Metering pump

2007-02-20

2007-02-20

Shaver, Kevin (Department: 3754)

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

C222S341000

Reexamination Certificate

active

10477443

ABSTRACT:
The invention relates to a metering pump comprising a pump barrel (1) housing a dose chamber (32) and control means that can be moved between a discharge position and a rest position. The inventive metering pump is characterised in that the control means comprise: a push rod (2); a piston (3) that can slide in relation to the push rod (2) and in relation to the pump barrel (1) all the while remaining in permanent contact with said two elements; and an elastically-deformable annular valve (4) that rests permanently against the push rod (2). The control means are moved between the rest position and the discharge position in two steps; the push rod (2) slides in relation to the piston (3) in the pump barrel; and subsequently the push rod (2) and the piston (3) slide jointly in the pump barrel (1) and discharge opening (42) is released.

REFERENCES:
patent: 3753518 (1973-08-01), Kutik
patent: 4911336 (1990-03-01), Blake
patent: 5267673 (1993-12-01), Crosnier et al.
patent: 0 726 097 (1996-08-01), None
patent: 1 441 127 (1966-12-01), None

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