JP2003024842A - Trigger pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the sticking of a piston or the leakage of a liquid in a trigger pump. SOLUTION: In the trigger pump composed of a combination of a body 1 provided with a jetting nuzzle 1a, a trigger 2 supported by the body 1 with a pivot shaft 3 to be rocked, a cylinder 4 and the piston 5 and for jetting the liquid through the jetting nozzle 1a by sucking the liquid into the cylinder 4 and pressurizing with the reciprocal movement of the piston 5 by the pressure with the pulling of the trigger and the disengagement, a long hole 1d for holding the trigger 2 to be rocked by being engaged with the pivot shaft 3 is provided in the body 1 or the trigger 2 and a guide (g) for pressing the piston 5 along the axial center thereof by guiding the main body part of the trigger 2 linearly in the pulling of the trigger 2 is arranged between the body 1 and the trigger 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger pump, and an object of the present invention is to avoid a stick of a piston in a cylinder to realize reliable liquid injection.

[0002]

2. Description of the Related Art Trigger pumps are often used in containers filled with fungicides, detergents, etc., and generally have a structure in which a body part having an injection nozzle attached to its tip part,
The body is composed of a trigger that is swingably supported via a pivot shaft, and a suction / pressurization mechanism that incorporates a piston in a cylinder and controls suction and pressurization of liquid.

Such a pump draws in and pressurizes the liquid by alternately repeating the pulling of the trigger and the release thereof to operate the piston in the cylinder, whereby the liquid is continuously supplied from the injection nozzle provided at the tip of the body portion. To eject the liquid.

By the way, in the conventional type trigger pump, a trigger for actuating the piston is provided for the piston which linearly reciprocates along the inner wall surface in the cylinder.
Since it swings in a circular arc with the pivot as the fulcrum, there is a portion where the piston locally and strongly contacts the inner wall surface of the cylinder, and when such a state is continued for a long time, There is a possibility that the piston may stick inside the cylinder and the liquid may not be jetted, or that the inner wall surface of the cylinder may be unevenly worn and the liquid may leak from that portion.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to propose a novel trigger pump capable of solving the above conventional problems.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a body having an injection nozzle, a trigger swingably supported by the body via a pivot shaft, and a combination of a cylinder and a piston. A trigger pump that sucks and pressurizes liquid into a cylinder by ejecting the liquid through the injection nozzle by reciprocating movement of a piston caused by pressing and release of the towing, wherein a pivot shaft is attached to the body or trigger. A long hole is provided to hold the trigger so that the trigger can swing, and between the body and the trigger, the main body of the trigger is linearly guided to draw the piston along the axis of the trigger when the trigger is pulled. The trigger pump is characterized in that a guide for pressing is provided.

In the trigger pump having the above structure, the guide is composed of a projection provided on the main body of the trigger and a rail-shaped groove provided on the body for sliding the projection along the axial center of the piston. Is desirable.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described more specifically with reference to the drawings. FIG. 1 shows the entire structure of the trigger pump in its cross section, and FIG. 2 shows the relationship between the trigger and the body supporting it in an exploded state.

In FIGS. 1 and 2, reference numeral 1 is the body of the trigger pump. The body 1 is provided with an injection nozzle 1a at its tip, and a passage 1b and a valve 1c for passing the liquid relating to the injection are arranged inside the injection nozzle 1a.

Reference numeral 2 is a trigger, 3 is a pivotal shaft for swingably supporting the trigger 2 in the elongated hole 1d of the body 1, and this pivotal shaft 3 is shown here as an example integrally formed with the trigger 2. There is. Further, 4 is a cylinder integrated with the body 1, 5 is a piston arranged in the cylinder 4, and 6 is an elastic member such as a spring for elastically supporting the piston 5 in the cylinder 4.

Further, 7 is a pair of protrusions provided on the side wall of the main body of the trigger 2, 8 is a rail-shaped groove formed on the inner wall surface of the body 1 parallel to the axis of the piston 5, and the protrusion 7 Fits in the groove 8 and can slide along the groove 8, and the protrusion 7 and the groove 8 constitute a guide g for linearly guiding the trigger 2.

Reference numeral 9 is an intake which is assembled to the body 1 by a connecting means such as an undercut, and the intake 9 has a check valve 9a therein. Also, 1
Reference numeral 0 is a suction pipe connected to the intake 9 for sucking liquid in the container, and 11 is a screw cap for fixing and holding the body 1 at the mouth of the container via the intake 9.

In the trigger pump having the above structure,
When the trigger 2 is pulled according to the arrow in FIG. 1, the piston 5 is pressed until it comes into contact with the end of the cylinder 4. When the pulling of the trigger 2 is released when the piston 5 comes into contact with the end of the cylinder 4, the piston 5 is returned to the initial position by the urging force of the elastic member 6, and at this time, the inside of the cylinder 4 is under negative pressure. Therefore, the liquid in the container body flows into the cylinder 4 via the suction pipe 10 and the intake 9.

When the trigger 2 is pulled again and the piston 5 is pressed from this state, the liquid flowing into the cylinder 4 is pressurized and discharged from the port P. At this time, the passage of the intake 9 is kept closed by the check valve 9a, while the liquid discharged from the port P is discharged by the valve 1c.
Injection is performed from the tip of the injection nozzle 1a toward the outside through the passage 1b, and continuous injection is possible by repeating this series of operations a plurality of times.

The conventional type trigger has a pivot shaft 1 as shown in FIG. 3 which shows the positional relationship between the piston and the trigger.
Since it oscillates so as to draw an arc around 2
It was also feared that the piston 3 would stick to the inside wall surface of the cylinder 14 locally, causing the piston 13 to stick inside the cylinder 14. However, the trigger pump according to the present invention, as shown in FIG. The support shaft 3 is engaged with a long hole (dumb hole) 1d provided in the body 1, and when the trigger 2 is pulled, the pivot shaft 3 moves together with the trigger 2 within the opening range of the long hole 1d (trigger). While 2 moves to draw an arc (δt in FIG. 3), the protrusion 7 linearly slides along the groove 8 and presses the piston 5 along its axis.

The trigger pump shown in FIGS. 1 and 2 above is
Although the example in which the pivot shaft 2 is engaged with the elongated hole 1d of the body 1 is shown, the body 1 may be provided with the pivot shaft 3 and the trigger 2 may be provided with the elongated hole, and this point is not limited.

In the present invention, the case in which the elongated hole 1d is applied in order to absorb the amount (δt) that the trigger 2 draws an arc is shown as an example, but this supports the pivot shaft 3 so that it can swing. It may be a recess as long as it can. Guide g
Also in the present invention, the case where the projection 7 and the groove 8 having the function of the rail are applied is illustrated, but any means can be applied as long as the trigger 2 can be guided linearly.

The trigger pump according to the present invention can be made of synthetic resin, and the injection molding method is advantageously applied to the production of each component.

[0019]

According to the present invention, when the trigger is pulled, the piston can be pressed along its axial center, so that there is no malfunction due to the stick of the piston. Further, liquid does not leak from between the piston and the cylinder.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a trigger pump according to the present invention.

FIG. 2 is a view showing a mounted state of a body and a trigger of the trigger pump shown in FIG.

FIG. 3 is an explanatory diagram of a drafting procedure of a conventional type trigger pump.

FIG. 4 is an explanatory view of a procedure for pulling a trigger pump according to the present invention.

[Explanation of symbols]

1 body 1a injection nozzle 1b passage 1c valve 1d long hole 2 trigger 3 pivots 4 cylinders 5 pistons 6 Elastic member 7 protrusions 8 Rail-shaped groove 9 Intake 9a Check valve 10 suction tube 11 cap g guide

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Claims (2)

[Claims] 1. A body including an injection nozzle, a trigger swingably supported by the body via a pivot shaft, a combination of a cylinder and a piston, and the pressing and releasing of the trigger when the trigger is pulled. A trigger pump that sucks and pressurizes liquid in a cylinder by reciprocating movement of a piston to eject liquid through the injection nozzle, wherein a pivot shaft is engaged with the body or trigger to swing the trigger. An elongated hole for holding is provided, and a guide for linearly guiding the main body of the trigger to push the piston along its axial center is provided between the body and the trigger when the trigger is pulled. Trigger pump characterized by: 2. The guide comprises a protrusion provided on a main body portion of the trigger and a rail-shaped groove provided on the body for sliding the protrusion along the axial center of the piston.
The described trigger pump.