Pump dispenser having vent valve

Details Pump dispenser having vent valve Pump dispenser having vent valve

1999-12-17

2001-06-12

Shaver, Kevin (Department: 3754)

Dispensing

Resilient wall

Supply container delivering to receiving chamber

C222S383100

Reexamination Certificate

active

06244473

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to pump dispensers. More specifically, this invention relates to pump dispensers in which a trigger works a pump and periodically opens a vent, permitting air from the outside into the container to replace displaced liquid.
BACKGROUND OF THE INVENTION
The von Schuckmann U.S. Pat. No. 5,603,434 issued Feb. 18, 1997 discloses a pump dispenser having a trigger-type actuator having a rearward arm which vents the container when the trigger is drawn back. More specifically, the arm brushes a projection on a tubular liner which normally engages about the inside of the tubular support for the pump. The projection raises the line away from the wall of the support to partly uncover a vent opening.
The present invention may be regarded as an improvement on the invention shown in von Schuckmann '484 in that it provides for a funnel-shaped vent seal which assures by its structure a reliable breaking of the seal at positions of the trigger and a reliable closing of the seal when the trigger is released.
SUMMARY OF THE INVENTION
The invention is, of course, described in the claim language below. Briefly, in a pump dispenser the present invention comprises a funnel-shaped vent seal which has a line contact with the inside of the pump body tubular support. The funnel-shaped vent seal includes a forward projection adapted to be engaged by a rearward arm on the trigger to permit air into the dispenser container.


REFERENCES:
patent: 3726442 (1973-04-01), Davidson et al.
patent: 3768734 (1973-10-01), Anderson, Jr. et al.
patent: 3897006 (1975-07-01), Tada
patent: 3973700 (1976-08-01), Schmidt et al.
patent: 3986644 (1976-10-01), Grogan et al.
patent: 4101057 (1978-07-01), LoMaglio
patent: 4921017 (1990-05-01), Tada
patent: 5114052 (1992-05-01), Tiramani et al.
patent: 5603434 (1997-02-01), von Schuckmann
patent: 5636768 (1997-06-01), Yamada
patent: 5711460 (1998-01-01), Saito et al.
patent: 5738251 (1998-04-01), Schuckmann

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