Container-mounted pump means with external restoring spring

Details Container-mounted pump means with external restoring spring Container-mounted pump means with external restoring spring

2000-10-24

2001-10-30

Shaver, Kevin (Department: 3754)

Dispensing

With lock or fastening seal

Inhibiting actuation of discharge assistant

C222S321900, C222S380000, C222S340000, C222S384000

Reexamination Certificate

active

06308865

ABSTRACT:

BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,307,962 issued to the same inventor of this application disclosed a container mounted pump with an improved check valve formed thereon. However, the spring (
3
), provided for urging the piston (
2
) upwardly when releasing the nozzle head (
1
) to suck liquid into the accumulator (
4
) for pumping liquid outwardly, is formed in the accumulator (
4
) to be impregnate ed in the liquid to possibly contaminate the liquid by the spring. The spring (
3
), if being made of steel or iron material, may be Corroded or eroded by the liquid (aqueous solution) within the accumulator.
The present inventor has found the drawbacks of the conventional a container-mounted pump and invented the present pump means having external restoring spring provided outside the accumulate or.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a pump device adapted to be mounted on a liquid container including a nozzle head formed on a top portion of a piston reciprocatively held in a liquid accumulator mounted on the liquid container, a restoring spring resiliently retained d between the nozzle e head and a fastening ring which is secured on an upper portion of the accumulator, a container cap secured on a top portion of the liquid container and fastened between the fastening ring and a flange of the accumulator, a suction tube connected to the accumulator and inserted in the liquid container for sucking liquid into the accumulator; characterized in that the restoring spring is disposed around a piston rod outside an interior of the pump and of the accumulator to prevent contamination of the liquid by the spring or to prevent corrosion of the spring by the liquid.


REFERENCES:
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patent: 3759426 (1973-09-01), Kane
patent: 4183449 (1980-01-01), Blake
patent: 4243159 (1981-01-01), Spatz
patent: 4369900 (1983-01-01), Saito et al.
patent: 4458832 (1984-07-01), Corsette
patent: 4503997 (1985-03-01), Corsette
patent: 5307962 (1994-05-01), Lin
patent: 5409146 (1995-04-01), Hazard et al.
patent: 5664706 (1997-09-01), Cater
patent: 6010036 (2000-01-01), Bougamont et al.
patent: 6065647 (2000-05-01), Bliss

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