JPH0531411A - Manual trigger type dispenser - Google Patents

Abstract

PURPOSE:To integrally form a piston for executing a reciprocating motion in a cylinder with a trigger, and to provide a virgin seal in the trigger. CONSTITUTION:On the left and the right sides of a front wall 28 of a trigger, a notch 34 is provided in the upper and the lower parts of a connecting part 32 by leaving the connecting part 32, and a trigger 16 and a piston are formed integrally from plastic through the front wall of the trigger. A virgin seal 36 is connected so as to be peelable to the front wall 28 of the trigger in the vertical direction by a pair of connecting pieces 32 in about the center of the notch 34, and formed integrally with the trigger 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual trigger-type dispenser which sucks liquid into a cylinder and pressurizes and discharges the liquid by reciprocating motion of a piston which is interlocked with pulling of a trigger.

[0002]

2. Description of the Related Art Due to the environmental problem of depletion of the ozone layer by chlorofluorocarbon gas, a manual trigger-type dispenser that pressurizes and discharges liquid by using a piston pump without using chlorofluorocarbon gas is drawing attention.

[0003] Usually, this type of dispenser is detachably mounted by screwing a bottle cap onto the external thread of the mouth of a container containing a liquid.

The piston reciprocates in the cylinder in association with the pulling (pushing) of the trigger against the return spring,
When the piston is returned from the pushing position to the initial position, the cylinder is negatively pressured. Then, the primary valve is opened and the secondary valve is closed. Then, the liquid in the container is sucked up by the cylinder through the suction tube and the primary valve.
After that, when the piston is pushed against the biasing force of the return spring, the liquid in the cylinder is pressurized, and the pressurized liquid is discharged from the outlet opening the secondary valve.

Generally, the components of the dispenser are
Except for the return spring, it is made of plastic and it is strongly desired to reduce the number of parts. If the number of constituent members of the dispenser can be reduced, not only the cost of the mold becomes unnecessary, but also the assembly can be performed easily, and the dispenser can be mass-produced inexpensively and efficiently.

[0006]

A conventional manual trigger-
In the type dispenser, the spinner, valve spring, and secondary valve are integrally molded from plastic (usually thermoplastic resin), and the trigger is integrally molded from the nozzle and plastic to reduce the number of parts. (For example, USP 4558821).

While the trigger swings around its pivot pin, the piston interlocked with the trigger linearly reciprocates and is pushed into the piston. in this way,
While the trigger moves rotationally (oscillates), the piston moves linearly.
It is difficult to integrally mold the piston.

If a cylinder is molded from a flexible material such as rubber and the liquid is sucked up and pressurized by the deformation of the cylinder by squeezing and the return to its original shape by its own elasticity, for example, USP No. 3749290 is disclosed. As disclosed,
The trigger and piston can be integrally molded. This USP
In, the piston has a substantially L-shaped cross section, and is integrally molded from the trigger and the plastic through a hinge.

However, with the above-mentioned structure in which the cylinder is squeezed, the liquid cannot be sufficiently pressurized. Further, since the cylinder is molded from a flexible material such as rubber, it is affected by temperature and is essentially inferior in durability. Further, since the cylinder is repeatedly deformed, it is easily damaged, and in this respect as well, it lacks durability. In addition, it has poor chemical resistance and limits the liquid that can flow out. In any case, the dispenser having the above structure is not practical.

As a practical dispenser capable of sufficiently pressurizing a liquid and having durability, the piston should reciprocate in the plastic cylinder, and the piston and the trigger reciprocating in the cylinder should reciprocate. Integral molding is
It has not yet been materialized.

By the way, the dispenser is mounted on a container containing a liquid, transported, and exhibited, and the trigger is
If it is accidentally towed due to a fall or the like, liquid may leak. Therefore, it is known that the trigger is locked and cannot be pulled (for example, USP No. 3927834).
No., USP 4558821).

However, in this structure, it is necessary to provide the lock member for locking the trigger and to form the engaging hole and the engaging pin for engaging the lock member, which complicates the structure. Also, the locking member impairs the aesthetic appearance.

In a manual push type dispenser in which liquid is sucked up into a cylinder by pressurization of a nozzle head (also referred to as a push button) and pressure is applied instead of pulling a trigger, the nozzle head is erroneously pressed during transportation and during exhibition. In order to prevent this, a protective member called a virgin seal is provided.

Generally, the virgin seal covers the pressing surface (upper surface) of the nozzle head and is formed in a peelable manner. Even if the pushing force erroneously acts on the pressing surface of the nozzle head through the virgin seal, the virgin seal withstands the pushing force without peeling and prevents the pushing of the nozzle head, thereby Prevent liquid leakage. When the dispenser is actually used, when the virgin seal is pulled, the connecting piece is broken and the virgin seal is peeled off.

It can be said that such a virgin seal is extremely effective as a means for preventing the liquid from leaking out before use (during transportation and display). However, in the case of a trigger-type dispenser (trigger-type dispenser), it is difficult to mold the vulcanized seal so that the trigger cannot be pulled before use. Installation is suspended.

An object of the present invention is to provide a manual trigger-type dispenser in which a piston that reciprocates in a cylinder is integrally formed with a trigger.

According to the present invention, a piston and a trigger are integrated and a manual trigger provided with a virgin seal is provided.
Another purpose is to provide a type dispenser.

[0018]

In order to achieve this object, according to the present invention, the trigger and the piston are provided with notches on the left and right sides of the front wall of the trigger, leaving notches on the left and right sides of the trigger. , Is integrally molded from plastic through the front wall of the trigger.

Further, a virgin seal is formed integrally with the trigger in a notch that is necessarily formed when the trigger and the piston are integrally formed. The virgin seal is releasably connected to the front wall of the trigger in the vertical direction by a pair of connecting pieces at approximately the center of the notch.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a manual trigger-type dispenser 10 according to the present invention includes a cylinder 12
A piston 14 reciprocating in the cylinder, a trigger 16 interlocking with the piston, and a dispenser body 18, the cylinder being molded as part of the dispenser body.

For example, the dispenser body 18 is screwed to the mouth of the container 21 by the bottle cap 20.

The internal structure of the dispenser 10 is the same as that known in the art, and will not be described in detail because it is not the purpose of the present invention. Generally speaking, when the trigger 16 is pulled against the return spring to reciprocate the piston 14 in the cylinder, the liquid in the container flows into the cylinder 12 via the suction tube and the primary valve. To do. Then, the liquid is pressurized in the cylinder, the pressurized liquid flows through the flow path of the nozzle and the secondary valve, is vortexed by the spinner (vortexing member), and is the orifice 24 of the nozzle cap 22 as a spray flow (see FIG. 3). Drained from.

The cylinder 12, the piston 14, the trigger 16, and the dispenser body 18 are all formed by injection molding from plastic. In the embodiment, in addition to the cylinder 12 and the dispenser body 18, the piston 14 is integrated. The trigger-16 is also integrated.

A nozzle is built in the dispenser body, and pivot holes are formed in the left and right side walls of the nozzle. The upper end of the trigger 16 is formed into a bifurcated fork so as to generate elasticity, and a pivot pin is provided from the inner wall facing the upper end.
26 stretches. By engaging the pivot pin 26 with the pivot hole of the side wall of the nozzle by utilizing the elasticity of the trigger 16, the trigger is pivotally pivoted on the nozzle, in other words, the dispenser body 18. It is supported (see FIGS. 1 and 2).

The structure for swingably attaching the trigger 16 to the dispenser main body 18 is not limited to the above-described one, and the trigger may be swingably attached by another configuration.

The trigger 16 has side walls 29 on both sides of the front wall 28.
As shown in FIGS. 1 and 3, the trigger 16 has a front wall, and the trigger 16 has a piston.
14 is integrally molded from plastic.

While the trigger 16 swings about its pivot pin 26, the piston 14 reciprocates linearly and is pushed into the piston 12. Thus, trigger-16
Rotates (oscillates), and the piston 14 moves linearly. Therefore, in the conventional manual trigger-type dispenser,
Trigger and piston are not integrally molded.

However, in the spencer 10 of the present invention, the trigger 16 and the piston 14 are integrally formed by leaving the connecting portions 32 on the left and right sides of the front wall 28 of the trigger and forming the notches 34 on the upper and lower sides. is doing. In this configuration, the twisting of the connecting portion 32 ensures the linear movement of the piston despite the trigger 16 swinging.

Generally, the distance between the center of swinging of the trigger (the pivot pin) and the center of the piston (corresponding to the distance L in FIG. 2) is the point of action of the traction force of the finger holding the trigger, the swinging. It is 40 to 50% of the distance between the centers. If the distance L shown in the figure is set at this ratio, the swing angle α of the trigger 16 at the connecting portion 32 becomes 10 to 15 °, and at such swing angle, the connecting piece made of plastic is It can withstand repeated twisting without breaking and has no problem with durability.

For example, the trigger 16 and the piston 14 are made of plastic such as polypropylene or polyethylene.

Connecting parts 32 on the left and right sides of the front wall 28 of the trigger
In the structure in which the trigger 16 and the piston 14 are connected to each other and the trigger and the piston are integrated, the number of parts is reduced and the assembling can be performed quickly.

The liquid is sufficiently pressurized because the piston 14 is reciprocated in the cylinder 12 instead of pressing and deforming the cylinder 12 to pressurize the liquid. Also, cylinder 12
There is no problem in durability and chemical resistance.

In this structure, the trigger is provided above and below the connecting portion 32.
A notch 34 is inevitably formed in the front wall 28, and a virgin seal 36 is provided in this notch, as shown in FIG.

The virgin seal 36 is connected to the front wall 28 in the vertical direction by a pair of connecting pieces 36a at approximately the center of the notch 34, and is integrally formed with the trigger 16. Here, the connecting piece 36
The a is shaped so that it can be easily broken by pulling the end of the virgin seal 36.

In order to pull the trigger 16 and push the piston 14 in, twisting of the connecting portion 32 is indispensable. However, since the virgin seal 36 is connected to the front wall 28 in the vertical direction by the connecting piece 36a, the virgin seal is obstructed by the virgin seal and the connecting portion 32 is not twisted. Therefore, even if the trigger-16 cannot be pulled and the pulling force acts on the trigger-16 during transportation or during the exhibition, pulling of the trigger is blocked.
Liquid leakage is sufficiently prevented before the dispenser 10 is used.

The dispenser 10 is used by peeling and removing the virgin seal 36. For example, virgin seal
If the right end of 36 is pushed in, the opposite left end pops out, and if this left end is twisted and pulled to the right, the pair of connecting pieces 36a is broken and the virgin seal is easily separated from the trigger 16 (Fig. 4). When the virgin seal 36 is peeled off, the trigger 16 can be pulled as shown in FIG.

As described above, according to the present invention, the trigger-16,
Notches that are inevitably formed when the piston 14 is integrally molded
Leaving a portion of the front wall 28 within 34, the virgin seal 36 is molded. That is, with the integral molding of the trigger 16 and the piston 14, the virgin seal 36 can be easily obtained without any molding difficulty.

The virgin seal 36 is formed integrally with the trigger 16, and its presence does not feel uncomfortable and does not impair the aesthetic appearance of the dispenser 10. Moreover, the structure is not complicated.

A virgin seal 36 may be provided in one of the upper and lower cutouts 34 of the connecting portion 32. However, as shown in the figure, if the upper and lower cutouts 34 are provided with the virgin seals 36, unnecessary pulling of the trigger 16 can be reliably prevented.

The position of the breakable connecting piece 36a is determined by the notch 34
The closer it is to the center, the more the twisting of the connecting portion 32 is sufficiently prevented, and the unnecessary pulling of the trigger 16 can be surely prevented.As shown, the connecting piece can be formed almost in the center of the notch. preferable. However, as long as the liquid does not leak, the connecting piece 36a may be formed off the center of the notch 34.

The above-mentioned embodiments are intended to explain the present invention, and are not intended to limit the present invention at all, and all modifications and alterations made within the technical scope of the present invention are also included in the present invention. It goes without saying that it will be done.

[0043]

As described above, according to the present invention, the trigger-
By leaving notches on the left and right sides of the front wall of the, and making notches at the top and bottom, it is possible to integrally form the trigger and the piston, and the twisting of the joint causes the trigger to swing, but the piston does not move. The linear movement of is secured.

By integrating the trigger and the piston, the number of parts is reduced, and the assembly can be done quickly.

The liquid is sufficiently pressurized because the piston is reciprocated in the cylinder instead of pressing and deforming the cylinder to pressurize the liquid. Further, there is no problem in the durability and chemical resistance of the cylinder.

When the trigger and the piston are integrally formed, the virgin seal can be formed by leaving a part of the front wall in the notch formed inevitably, and the trigger and the piston are integrally formed. Accordingly, the virgin seal can be easily obtained without any difficulty in molding.

The virgin seal is formed integrally with the trigger so that its presence does not feel uncomfortable and does not impair the aesthetic appearance of the dispenser. Moreover, the structure is not complicated.

The virgin seal is connected to the front wall in the vertical direction by a pair of connecting pieces at approximately the center of the notch and is used as a trigger.
If it is integrally molded with, the twisting of the connecting portion can be sufficiently prevented, and unnecessary pulling of the trigger can be reliably prevented.

If virgin seals are provided in both the upper and lower cutouts, unnecessary pulling of the trigger can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a manual trigger-type dispenser according to an embodiment of the present invention.

FIG. 2 is a side view of the trigger-partially broken away of the dispenser during towing.

FIG. 3 is an enlarged front view of the dispenser before peeling the virgin seal.

FIG. 4 is an enlarged front view of the dispenser after peeling the virgin seal.

[Explanation of symbols] 10 Manual trigger-type dispenser 12 cylinders 14 piston 16 Trigger 18 Dispenser body 20 bottle caps 21 containers 22 Nozzle cap 24 Nozzle cap orifice 26 Trigger pivot pin (swing center) 28 Trigger front wall 30 Trigger side wall 32 Trigger-piston connection 34 Trigger front wall notch 36 version seal 36a Virgin seal breakable connecting piece Swing angle of α trigger

Claims (4)

[Claims] 1. A swingable trigger is pulled against a return spring, and a piston is reciprocated in the cylinder in association with the pulling of the trigger to suck up and pressurize liquid into the cylinder. In a manual trigger-type dispenser that is discharged by means of a trigger, a notch is provided above and below the connecting piece on the left and right sides of the front wall of the trigger, and the trigger and the piston are triggered.
A manual trigger-type dispenser characterized by being integrally molded from plastic through the front wall of the. 2. A swingable trigger is pulled against a return spring, and a piston is reciprocated in the cylinder in association with pulling of the trigger to suck up and pressurize liquid into the cylinder. In a manual trigger-type dispenser that discharges by flowing, a notch is provided above and below the connecting part while leaving a connecting part on the left and right sides of the front wall of the trigger, and the trigger and the piston are triggered.
Is integrally molded from the plastic through the front wall of the trigger; the virgin seal is releasably connected to the front wall of the trigger in the vertical direction by a pair of connecting pieces, and is integrated with the trigger in the notch. A manual trigger-type dispenser characterized by being molded. 3. The connecting piece triggers at approximately the center of the notch.
A manual trigger according to claim 2, which is connected to the front wall of the
Type dispenser. 4. The manual trigger-type dispenser according to claim 2, wherein the virgin seal is formed in both the upper and lower cutouts of the connecting portion.