Pushbutton for actuating a dispenser for semi-liquid substances

Details Pushbutton for actuating a dispenser for semi-liquid substances Pushbutton for actuating a dispenser for semi-liquid substances

1990-10-31

1992-03-17

Shaver, Kevin P.

Dispensing

With discharge assistant

Fluid pressure

222518, 239354, 239569, B65D 8300

Patent

active

050960989

ABSTRACT:
A problem which arises with dispensers for semi-liquid substances lies in there being an outlet channel which is permanently in communication with ambient air. After first use of the dispenser, the corresponding dead volume is filled with semi-liquid substance which quickly becomes spoiled; thereby making subsequent utilization at least difficult and possibly toxic or even impossible. The present invention avoids this difficulty by means of a pushbutton in which the outlet channel is defined by co-operation between a flexible part and a rigid part. The outlet channel extends essentially radially and its volume is reduced when the user applies axial pressure on the pushbutton. A motion transforming system for transforming axial displacement into radial displacement serves simultaneously to retract a plunger received in the outlet channel, thereby disengaging the delivery orifice of the pushbutton. Such a pushbutton is particularly advantageous when used in association with a metering pump type dispenser valve which can then be made without its own outlet valve.

REFERENCES:
patent: 3323695 (1967-06-01), Monahon
patent: 3584789 (1971-04-01), Traynor
patent: 3642179 (1972-02-01), Micallef
patent: 3887115 (1975-06-01), Petterson
patent: 3991916 (1976-11-01), Del Bon
patent: 4723725 (1988-02-01), Comment
patent: 4798311 (1989-01-01), Workum
patent: 4957239 (1990-09-01), Tempelman
patent: 5027982 (1991-07-01), Demarest
patent: 5037015 (1991-08-01), Collins

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