Dispensing – Resilient wall – Supply container delivering to receiving chamber
Patent
1981-01-15
1984-12-25
Rolla, Joseph J.
Dispensing
Resilient wall
Supply container delivering to receiving chamber
222214, 222380, 222383, 1375124, 137853, 417560, 417566, B05B 1100
Patent
active
044898614
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a manual liquid dispensing device for spraying liquid such as cleanser, cosmetic chemical or the like in a simple structure by employing a valve having both intake and exhaust functions of the liquid within a cylinder bore and, more particularly, to a liquid dispensing device of trigger operated type made of plastic material such as polyethylene, polypropylene, nylon or the like adapted for an automatic assembling production at a minimum of number of parts.
BACKGROUND ART
A manual liquid dispensing device is widely used, because it can spray liquid through a nozzle hole or orifice by manually squeezing a trigger to thereby compress the liquid. Since the sprayer of this type has a stainless steel ball check valve disposed in the intake portion and a free cylindrical valve disposed in a nozzle portion to move with respect of the opening and closing operation of the check valve as disclosed, for example, U.S. Pat. No. 3,685,739, has a complicated structure to thereby require sophisticated assembly steps. As the piston slidably mounted into a cylinder bore of this sprayer consists of a piston body interlocked to a trigger, a rubber cap-shaped piston washer slidably contained within the cylinder bore, and a returning coil spring, it necessitates a complicated automatic assembly line due to numerous number of components.
Accordingly it is an object of the present invention to provide a liquid dispensing device which can eliminate all the disadvantages of the conventional trigger operated liquid sprayer and can readily be automatically assembled into a simple structure.
The present invention provides a liquid dispensing device which can prevent the negative pressure buildup in the container during its priming time by inserting a cylindrical adapter having stepwise cylinder bore diameters and a hole perforated at the side wall thereof into the cylinder bore.
The present invention provides a liquid dispensing device which can prevent liquid form flowing into the space formed between the cylinder bore and bellows interposed between the adapter and the piston within the cylinder bore with a gap formed to communicate with a liquid container by separating part of the adapter end from the cylinder bore wall when the piston is reciprocately mounted into the cylinder bore for smooth spraying operation.
DISCLOSURE OF THE INVENTION
The present invention provides an improved liquid dispensing device for spraying liquid by advantageously incorporating a cylindrical valve made of synthetic or natural rubber slidably mounted within the cylinder bore of the body thereof. This valve is formed of single elastic material for operating to open only an outlet of liquid at a trigger squeezing time and to open only an inlet of the liquid at a trigger releasing time. Since only such a valve is employed both intake and exhaust the liquid, it can reduce the number of parts and can also smoothly operate a pumping action in the manual liquid dispensing device.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is vertical sectional view of a manual liquid dispensing device of a preferred embodiment of the present invention used for spraying liquid;
FIG. 2 is a partially enlarged sectional view of the valve in the liquid dispensing device shown in FIG. 1;
FIG. 3 is a vertical sectional view of a liquid dispensing device of another preferred embodiment of the present invention;
FIG. 4 is a partially enlarged sectional view of the valve in the liquid dispensing device at liquid intake time in FIG. 3;
FIG. 5 is a partially enlarged sectional view of the valve in the device at liquid exhausting time in FIG. 3;
FIG. 6 is a vertical sectional view of a liquid dispensing device of a further preferred embodiment of the present invention;
FIG. 7 is a partially enlarged longitudinally sectional view of the liquid dispensing device at operating time in FIG. 6;
FIG. 8 is a partially enlarged laterally sectional view of the device taken along the line VIII--VIII in FIG. 7; and
FIG. 9 is a vertical sectional view
REFERENCES:
patent: 2856863 (1958-10-01), Folley
patent: 3187960 (1965-06-01), Gorman
patent: 3527551 (1970-09-01), Kutik et al.
patent: 4124148 (1978-11-01), Vieler et al.
patent: 4225061 (1980-09-01), Blake et al.
patent: 4227628 (1980-10-01), Parsons
patent: 4227650 (1980-10-01), McKinney
Saito Tadao
Tazaki Takaharu
Handren Frederick R.
Rolla Joseph J.
Yoshino Kogyosho Co. Ltd.
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