Trigger type liquid discharge device

Details Trigger type liquid discharge device Trigger type liquid discharge device

1996-06-25

1998-01-27

Derakshani, Philippe

Dispensing

With discharge assistant

With material supply container and discharge assistant with...

2223831, B67D 540

Patent

active

057114609

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to an improved trigger type liquid discharge device to be fitted to an opening of a liquid container containing liquid in order to discharge the liquid.


PRIOR ART

FIG. 33 of the accompanying drawings illustrates a known trigger type liquid discharge device disclosed in U.S. Pat. No. 4,819,838 and so designed as to be fitted to the opening of a liquid container containing liquid in order to discharge the liquid.
In the known trigger type liquid discharge device as disclosed in U.S. Pat. No. 4,819,888, a pump unit E is arranged in parallel with a horizontally disposed discharge pipe unit F as illustrated in FIG. 33.
The trigger type liquid discharge device as illustrated in FIG. 33 is provided with a fitting section 101 by which the liquid discharge device is secured to an opening of a liquid container. When a trigger 102 of the device is pushed in a direction indicated by arrow J', a pushing member 103 by turn depresses a transversal groove 105 of a head 104 of piston unit G of the device so as to move a piston I until an end face 106 of the piston I abuts a bottom wall 107 of a cylinder H. Thus, the liquid liquid filled in a cylinder chamber 108 is pushed out of the device through a liquid suction/discharge port 109 to a liquid flow path 110 so as to push a discharge valve body 111 under its pressure.
The discharge valve body 111 has a reslliently deformable section 112, which is resiliently deformed under the pressure of the liquid to open discharge valve seat 113. Thus, liquid is allowed to flow into a flow path 115 of the discharge pipe F through discharge valve chamber 114. Then the liquid flows into an another flow path 116 and then a shallow groove M arranged between a liquid guide L and a short pipe K of a nozzle head J. Then, the liquid flows into a still another flow path 117 in which spins the liquid, and is finally discharged through a discharge aperture 118.
Meanwhile, the piston I compresses a spring 119 contained in the piston unit. A ball valve 120 also contained in the unit is forced to abut a suction valve seat 121 under the pressure applied by the liquid of the flow path 110.
After completing to discharge the liquid through the discharge aperture 118, and if the trigger 102 is released, the piston is returned to a position shown in FIG. 33 by the resilient force of the spring 119 to expand the cylinder chamber 108 so as to generate a negative pressure in the chamber 108. Such negative pressure acts on the discharge valve body 111 and the ball valve 120 to cause the discharge valve body 111 to firmly abut and close the discharge valve seat 113. Consequently, the ball valve 120 is moved away from the suction valve seat 121 to allow liquid in the liquid container to flow through a suction pipe 122, the liquid flow path 110 and the port 109 into the cylinder chamber 108 so that the device ready is made for another discharge operation.
The cylinder H is provided in a part of its peripheral wall with an air intake port 123. The air intake port 123 is held in communication with the liquid container, on which the device is mounted by means of the fitting section 101 of the device, through air ducts 124 and 125.
The piston I has a stroke end side resilient annular skirt 126 extending toward the bottom wall 107 of the cylinder H and an approach end side resilient annular skirt 127 extending toward the opening of the cylinder H. Said annular skirts 126 and 127 are held in close contact with the inner wall of the cylinder.
When the piston I is located in a stroke end position where the end surface 106 abuts the bottom wall 107 of the cylinder H, an edge 128 of the approach end side annular skirt 127 is positioned beyond the air intake port 123 of the cylinder H toward the bottom wall 107. Under this condition, air is introduced into the liquid container as the air intake port 123 communicates with an opening 129 of the cylinder H that is exposed to the atmosphere. If, to the contrary, the piston I is located at an approach end position as indicated in

REFERENCES:
patent: 4227650 (1980-10-01), McKinney
patent: 4313568 (1982-02-01), Shay
patent: 4313569 (1982-02-01), Burke
patent: 4358057 (1982-11-01), Burke
patent: 4819835 (1989-04-01), Tasaki

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