Dispensing – With discharge assistant – With material supply container and discharge assistant with...
Patent
1994-05-03
1995-11-07
Kashnikow, Andres
Dispensing
With discharge assistant
With material supply container and discharge assistant with...
B67D 540
Patent
active
054641306
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an improvement in a piston of a pump section of a trigger-type liquid dispenser or sprayer to be fitted to an opening of a liquid container for exhausting or ejecting the liquid content of the container.
BACKGROUND OF THE INVENTION
FIG. 10 of the accompanying drawings illustrates a conventional trigger-type liquid dispenser or ejector to be fitted to an opening of a liquid container for exhausting or ejecting the liquid content in the container, where a tilted pump section A is arranged between a vertically disposed dispenser main body B and a horizontally disposed exhausting section C to allow a piston section D to have a sufficient stroke so that the liquid content in the container may be exhausted by a large amount in a single stroke. When, however, the dispenser is made of synthetic resin, it requires a cumbersome operation of being three-dimensionally released from a mold in X-, Y- and Z-directions, entailing necessarily the problem of the low productivity.
U.S. Pat. No. 4,819,835 discloses an improved dispenser for solving the problem of the low productivity.
FIG. 8 of the accompanying drawings schematically illustrates a trigger-type liquid dispenser disclosed in the U.S. Pat. No. 4,819,835. It includes a pump section E and an exhausting section F arranged horizontally and in parallel with each other so that the operation of releasing the molded product from the mold may be carried out only two-dimensionally in X- and Y-directions to raise the manufacturing efficiency.
However, since the pump section E is arranged horizontally, a stroke of a piston section G of the dispenser is reduced so as to reduce an amount of liquid that can be exhausted by a single stroke of the piston section G when compared with the dispenser of FIG. 10. In order to avoid the exhausted amount is reduced, the U.S. Patent discloses to use a cylinder H having a large diameter and a piston I having a large diameter so that the dispenser may exhaust a desired amount of liquid in as single stroke of the piston.
The trigger-type liquid dispenser illustrated in FIG. 8 also includes a container fitting section 1 and is rigidly fitted to the opening of a liquid container at the container fitting section 1. When a trigger 2 is pushed along the direction of arrow J, a press member 3 presses a horizontal groove 5 cut along a lateral side of a head 4 of a piston section G to displace piston I until its end surface 6 abuts a bottom wall 7 of a cylinder H. Thus, liquid contained in a cylinder chamber 8 is flowed out through a liquid inlet/output port 9 into a liquid path 10 so as to press a discharge valve body 11.
Then, the discharge valve body 11 is moved upwardly by the resilience of an elastic section 12 of the discharging valve body 11 to open a discharging valve seat 13. Thus, the fluid flows out from a discharging valve chamber 14 into a flow path 15 and then into other flow paths 16 and 17 so that it is finally exhausted or discharged through a nozzle 18.
Meanwhile, the piston I compresses a spring 19 contained therein, while the liquid in the liquid path 10 presses a ball valve 20 against a suction valve seat 21.
When the liquid is completely exhausted through the nozzle 18 and the trigger 2 is released, the piston I is returned to the position as shown in FIG. 8 by a resilient force of the spring 19. Thus, the cylinder chamber 8 is enlarged so as to decrease a pressure in the chamber 8. Since such negative pressure in the cylinder chamber 8 acts on the discharge valve body 11 and the ball valve 20, the discharge valve body 11 comes into contact with the discharge valve seat 13 to close the valve seat 13 and the ball valve 20 moves away from the suction valve seat 21 so that the liquid contained in the liquid container is drawn into the cylinder chamber 8 via a suction pipe 22, the liquid path 10 and the port 9 and stored there for the next exhausting operation.
An air intake port 23 is provided on a peripheral wall of said cylinder H and communicates with an inside of the liquid
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Derakshani Philippe
Kashnikow Andres
Yoshino Kogyosho Co. Ltd.
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