Seal device for hand pumps dispensing paste or liquid products

Details Seal device for hand pumps dispensing paste or liquid products Seal device for hand pumps dispensing paste or liquid products

1989-05-17

1990-08-28

Huppert, Michael S.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222385, G01F 1136

Patent

active

049518429

ABSTRACT:
A seal device for hand pumps for dispensing a substance such as paste or liquid products from bottles containing such products, wherein upper closure element of the pump is formed of elastically deformable plastic material. In an axial hole of the closure element there is provided an annular lip defining a circular aperture of diameter slightly less than that of a corresponding part of the pump stem to ensure a seal between the stem and closure element during pump operation even when the bottle is inclined or inverted, while allowing a certain quantity of air to be drawn in to compensate the quantity of substance dispensed. The stem collar has on its upper face a coaxial annular seal rib which engages against the lower face of the closure element under the thrust action of a spring to provide a seal when the pump is not under operation.

REFERENCES:
patent: 3949906 (1976-04-01), Pettersen et al.
patent: 4010874 (1977-03-01), Steiman
patent: 4022354 (1977-05-01), Kotuby
patent: 4228931 (1980-10-01), Ruscitti et al.
patent: 4252507 (1981-02-01), Knickerbocker
patent: 4371099 (1983-02-01), Foster et al.
patent: 4434916 (1984-03-01), Ruscitti et al.
patent: 4773553 (1988-09-01), Van Brocklin

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