JP2002200443A - Push dispenser and spring body used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push dispenser, which is made lightweight and in which sure return force is attained and the rolling of a 1st valve is prevented, and a spring body used for the same. SOLUTION: The push dispenser is composed of a cylinder 1, a cap 2 for attaching the cylinder 1 to a mouth part of a vessel, the 1st valve 3 inserted into the cylinder 1, a piston 4 inserted freely slidably into the cylinder 1, a nozzle head 5 attached to the piston 4, a 2nd valve inserted into the piston 4 and the synthetic resin made spring body 7 repulsing the piston 4 inserted into the cylinder 1, the 1st valve is provided with a rod part 3A extending to be inserted through the 2nd valve in the piston 4 and the rod part 3A of the 1st valve is arranged to be inserted through the spring body 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump dispenser, and more particularly to a push dispenser having a structure in which liquid in a cylinder is ejected from a nozzle by pressing a nozzle head.

[0002]

2. Description of the Related Art Conventionally, a spray container has been used for spraying a liquid such as a medicine. As one of the pump dispensers as a spraying mechanism attached to the spray container, there is, for example, a push-type dispenser. This is a system that has a cylinder attached to the container mouth via a cap, presses down the nozzle head to move the piston, pressurizes the liquid in the cylinder, and vigorously ejects the fluid from the nozzle. .

For example, Japanese Patent Publication No. 3100911 discloses a push dispenser of this type.
That is, as can be seen from the drawing, this push dispenser includes a cylinder, a cap, a first valve, a piston, a nozzle head, a second valve, and a compression coil spring. When the nozzle head is pushed down against the force, the piston moves to pressurize the liquid in the cylinder, and the liquid is jetted from the nozzle with great force.

[0004] In such a push dispenser, the compression coil spring is a very important component element for giving a restoring force of the nozzle head, that is, a restoring force of the piston. Therefore, the compression coil spring is disposed between the piston and the suction tube so as to exert an appropriate elastic force.

The first valve has a long rod portion for positioning the second valve. The rod portion passes through the cylinder and the piston, and has a structure supported by the inner peripheral surface of the valve base and the second valve. Therefore, when the liquid flows between the first valve and the inner peripheral surface of the piston or between the inner peripheral surface of the valve base and the first valve, the second valve is likely to run out (ie, rattle). In other words, the second valve is liable to cause a lateral runout in the longitudinal axis, which hinders a smooth liquid flow.

On the other hand, in the case of a push dispenser, it is necessary to use a synthetic resin material instead of a metal material from the viewpoint of weight reduction and rust prevention. On the other hand, the resilience is insufficient, and a sufficient restoring force cannot be obtained.

[0007]

The present invention has been made based on such a technical background. That is, an object of the present invention is to provide a push dispenser that can obtain a secure return force and can prevent the first valve from swaying along with a reduction in weight. To provide.

[0008]

Means for Solving the Problems Thus, the present inventor has:
As a result of intensive research on such a background,
It has been found that the above problems can be solved by using a synthetic resin spring body having a pair of wavy leaf spring bodies,
The present invention has been completed based on this finding.

That is, according to the present invention, (1) a cylinder, a cap for attaching the cylinder to a container mouth, a first valve inserted into the cylinder, and a cylinder slidably inserted into the cylinder. A push dispenser including a piston, a nozzle head attached to the piston, a second valve inserted in the piston, and a synthetic resin spring body inserted in the cylinder and resilient to the piston. There is a push dispenser in which the first valve is disposed so as to penetrate the spring body.

(2) A cylinder, a cap for attaching the cylinder to the container mouth, a first valve inserted in the cylinder, a piston slidably inserted in the cylinder, and A push head dispenser comprising: a nozzle head attached to a piston; a second valve inserted into the piston; and a spring body made of synthetic resin inserted into a cylinder and repelling the piston. 1
The valve has a rod portion that extends until it passes through a second valve in the piston, and the rod portion of the first valve resides in a push dispenser that is disposed through a spring body.

Further, (3) the spring body is a leaf spring body comprising a pair of corrugated leaf springs and a cylindrical base connecting the pair of corrugated leaf springs at both ends, and the rod portion of the first valve is a cylinder. The present invention resides in a push dispenser which is prevented from being laterally shaken by radial standing pieces formed on a base.

Further, (4) the present invention resides in a push dispenser in which a virgin seal body is integrated with a cap via a detachable thin portion.

Further, (5) the push dispenser in which a return rib portion is formed on the cap and the piston is prevented from coming off by the rib portion.

Further, 6) the present invention resides in the push dispenser in which the second valve has a degree of freedom of vertical movement between a stopper formed on the piston and the valve seat.

(7) A spring body made of synthetic resin used for a push dispenser, the spring body having a pair of corrugated leaf springs.

Also, (8) a synthetic resin spring used for a push dispenser, comprising a pair of corrugated leaf springs and a cylindrical base connecting both ends of the pair of corrugated leaf springs. Exists in the spring body.

Further, (9), a radially standing piece for guiding the movement of the liquid is formed in the cylindrical base portion and is present in the spring body.

Further, (10) the spring body is a spring body formed of a polyolefin resin.

Further, (11) resides in a push dispenser including the spring body according to any one of the above.

The present invention, provided that it is in line with this object,
Naturally, a configuration combining two or more selected from the above 1 to 6 can also be adopted, and a configuration combining two or more selected from the above 7 to 10 can be naturally adopted, A push dispenser provided with such a spring body can be employed as well. ADVANTAGE OF THE INVENTION According to this invention, weight reduction as a push dispenser is achieved, a reliable return force is obtained, and a smooth liquid flow can be achieved.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a push dispenser according to the present invention will be described below with reference to the drawings. [Embodiment] FIG. 1 is a sectional view showing a push dispenser according to the present invention, showing a state before use (a state before a virgin seal portion is cut off).
This push dispenser includes a cylinder 1 that can be attached to a container mouth via a cap 2. By pushing down a nozzle head 5, a piston 4 is moved to pressurize the liquid in the cylinder, and the liquid is dispensed from a nozzle. It is of the type that ejects.

As the structure, a cylinder 1, a cap 2 for attaching the cylinder 1 to a container mouth, a first valve 3 inserted in the cylinder 1, and a cylinder 1 slidably inserted in the cylinder 1. Piston 4, a nozzle head 5 attached to the piston 4, a second valve 6 inserted in the piston 4, and a synthetic resin spring body inserted in the cylinder 1 and resilient to the piston 4. 7. The first valve 3 is arranged to penetrate the spring body 7. These components can be fixed by a press-fitting method between the components without using any adhesive or the like.

The cap 2 has a small-diameter portion and a large-diameter portion, and the large-diameter portion is screwed to the mouth of the spray container. The small diameter portion is provided with a return lip portion 2A, and when the piston 4 reaches the top dead center, the upper lip portion 4B of the piston (specifically, inside the upper lip 4B)
It stops when it comes into contact with the lip portion 2A. Therefore, there is no need to provide a separate chaplit independent of the cap for stopping the piston as in the related art, and there is an advantage that the number of parts is reduced. Nozzle head 5
Is attached to the piston 4 by extrapolation.

The second valve 6 is inserted (inserted) between the stopper portion 4C formed on the piston and the valve seat 4A with a degree of freedom of vertical movement as shown in the figure. The spring body 7 is attached between the reduced diameter portion 1D in the cylinder and the base portion 4D of the lower lip of the piston in a state of being in contact therewith.

On the other hand, the first valve 3 comprises a valve body 3B and an elongated rod part 3A which is extended from the valve body 3B. The valve body 3B is arranged between the stopper part 1C of the cylinder and the valve seat 1A in the vertical direction. It is inserted (interpolated) with the freedom of movement in the direction.
The rod portion 3 </ b> A is inserted through the spring body 7, further inserted into the second valve 6, and arranged to be in pressure contact with the inner peripheral surface of the second valve 6. Therefore, the second valve 6 is stopped by the frictional force at the required position of the rod portion 3A.

FIG. 2 is a partial sectional view showing a state after the virgin seal portion has been cut off. Virgin seal 2B
Can be easily separated from the cap 2 by picking and pulling the gripping piece 2B1 with a finger or the like. When the operation of pushing down the nozzle head 5 from this state is repeated several times, the liquid in the container body is sucked and filled into the cylinder. Here, it is assumed that the cylinder 1 is filled with liquid (initial state). When the nozzle head 5 is pushed down, the piston 4 also moves downward, and the liquid in the cylinder is pressurized.

FIG. 3 is a sectional view showing a state (bottom dead center) in which the nozzle head is pushed down from the state of FIG. Upon receiving the pressure, the first valve 3 comes into contact with the valve seat 1A of the cylinder to partition and separate the inside of the container and the inside of the cylinder. The compressed liquid is ejected from the tip (ie, nozzle) of the nozzle head 5 through the space between the inner wall surface of the piston 4 and the second valve 6. Thereafter, when the hand is released from the nozzle head 5, the nozzle head 5 is raised by the return force of the spring body 7 disposed in the cylinder.

When the nozzle head 5 rises due to the return force of the spring body 7, the inside of the cylinder becomes negative pressure, the valve body 3B of the first valve separates from the valve seat 1A of the cylinder, and the liquid in the container body enters the cylinder. It is sucked. Then, the upper lip portion 4B of the piston comes into contact with the lip portion 2A of the cap and stops moving (top dead center). At this point, the cylinder 1 is filled with the liquid sucked up from the container.

Next, a spring body 7 for applying a return force to the piston
Is described. FIG. 4 is a front view and a sectional view showing a spring body of the present invention. FIG. 5 is a front view and a cross-sectional view showing another spring body. This spring body has a curved portion with a larger bent portion than the spring body of FIG.

The spring body 7 is formed by arranging a pair of corrugated leaf springs 7B in parallel and connecting both ends of the pair of corrugated leaf springs 7B by a cylindrical base 7A. Corrugated leaf spring 7B
Is formed by bending a synthetic resin plate a number of times, and is formed in a wavy shape, so that higher elasticity can be obtained than in a conventional case formed in a coil shape. The ends of the corrugated leaf springs 7B are connected in a state where two (one pair) of the corrugated leaf springs 7B are arranged side by side.
A.

When the spring body 7 is disposed in the cylinder, the upper cylindrical base 7A is at the base 4D of the lower lip of the piston, and the lower cylindrical base 7A is at the reduced diameter section 1D of the cylinder 1. It will be in contact. The lower cylindrical base 7A
Is positioned and securely held and fixed by the radial standing wall 1B formed in the cylinder. A radial standing piece 7B1 is formed on the inner periphery of the cylindrical base 7A of the spring body 7. The radially standing pieces 7B1 guide the flow of the liquid efficiently, so that the liquid can be smoothly fed into the second valve 6. Further, the liquid sucked from the container body can be guided and smoothly fed into the cylinder.

The hole formed in the inner peripheral portion of the radial standing piece 7B1 has a diameter equal to or slightly larger than the diameter of the rod portion 3A of the first valve. Therefore, when the rod portion 3A of the first valve is inserted through the spring body 7, the rod portion 3A of the first valve is supported by the radially standing pieces 7B1 formed on the upper and lower cylindrical bases 7A of the spring body 7. This will hardly occur if the rod portion 3A moves laterally. In addition, since the distance between the upper and lower cylindrical bases is shorter than the distance between the valve bodies of the second valve and the first valve, the effect of preventing lateral blur can be exhibited.

By the way, the spring body 7 of the present invention has the advantage of doubling the resilience since it has a pair of, ie, two, corrugated leaf springs 7B, and is also excellent in durability. Originally, it is difficult to increase the spring force because the compression stroke of the spring body 7 is short (that is, about the lower width of the virgin seal portion). Moreover, it is important to use the synthetic resin spring body 7 in a long state in a range where the spring force is small in order to avoid creep.

Therefore, in order to obtain a large resilient force in a short compression stroke, the elastic force due to the wavy bending is efficiently used by using the corrugated leaf spring 7B, and two corrugated leaf springs 7B are used. By doing so, the degree of elasticity is increased. Incidentally, in the case of a conventional spiral coil spring, a large elastic force cannot be obtained in the case of a synthetic resin material.

On the other hand, by providing a pair (two) of the corrugated leaf springs 7B, the rod portion 3A of the first valve can be supported between the two springs. Furthermore, in a conventional spiral coil spring, when viewed in a cross section perpendicular to the axis of the cylinder, the coil spring is located in all directions and a certain resistance is generated in the liquid flow, but in the present invention, , Because the wavy leaf spring 7B is located only in a part,
There is very little resistance for liquid to pass through. That is, the liquid easily passes through the inside of the cylinder.

Next, the back suction function of the push dispenser of the present invention will be described. This back suction function is achieved by providing a degree of freedom so that the second valve 6 can be moved vertically (axially) within the piston. That is, as described above, the second valve 6 is inserted between the stopper portion 4C of the piston and the valve seat 4A with a freedom of vertical movement as shown in the figure. After the nozzle head is pushed down to the bottom dead center and the liquid is ejected from the nozzle, when the nozzle head 5 is pushed up by the return force of the spring body 7, in the first stage, the piston valve seat 4A and the lower part of the second valve are under the second valve. There is a time during which the valve 6A does not make contact.

FIG. 6 is a view showing the moment when the piston 4 rises from the bottom dead center and the lower valve 6A of the second valve contacts the valve seat 4A of the piston 4. Until the lower valve 6A of the second valve comes into contact with the valve seat 4A of the piston 4, the inside of the cylinder, the inside of the piston, and the inside of the cylinder in a state where the flow paths in the nozzle head (opened to the outside air) communicate with each other. In order to reduce the pressure, the inside of the nozzle head is also reduced at the same time, and the liquid remaining at the nozzle tip is sucked into the inside. When the piston 4 rises, the volume of the rod portion 3A of the first valve occupying in the piston decreases, so that the negative pressure in the piston caused by the decrease is also added.

The second valve 6 is a rod portion 3A of the first valve.
After the first stage described above, the valve seat 4A of the piston 4 and the lower valve 6A of the second valve come into contact with each other (see FIG. 6). And sucks up the liquid in the container body. When the piston 4 has reached the top dead center, the liquid does not remain at the tip of the nozzle and is slightly drawn in, so that the liquid at the nozzle tip is prevented from dripping and solidifying due to drying.

As described above, in the push dispenser of the present invention, the first valve, the cylinder, the cap, and the nozzle head are made of polypropylene, and the second valve and the piston are made of polyolefin resin. It is extremely effective in recycling. Also, in the assembly, all the connections by press fitting are possible, and each part is
There is no need to use any adhesive.

Although the present invention has been described above, the present invention is not limited to the embodiment, and it goes without saying that various other modifications are possible without departing from the essence of the present invention. The shape of each component is not limited to the embodiment, and can be freely modified as long as the function of the spring body of the present invention can be achieved.

[0041]

As described above, according to the present invention, the weight can be reduced because the metal spring body is not used. Since the number of parts is small, assembling is easy and cost is reduced. In addition, since all parts can be manufactured using a polyolefin-based resin, it has recyclability and can be adapted to environmental issues. When the spring body is composed of a pair of corrugated leaf springs and a cylindrical base connecting the pair of corrugated leaf springs at both ends, a reliable return force can be obtained, and the first valve can be prevented from being laterally shaken.
When the upright piece of the cylindrical base is provided, a smooth liquid flow is guaranteed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a push dispenser according to the present invention, showing a state before use (a state before a virgin seal portion is cut off).

FIG. 2 is a partial cross-sectional view showing a state after a virgin seal portion is cut off.

FIG. 3 is a cross-sectional view showing a state where a nozzle head is pushed down (bottom dead center).

FIG. 4 is a front view and a sectional view showing a spring body of the present invention.

FIG. 5 is a front view and a sectional view showing another spring body of the present invention.

FIG. 6 is a diagram illustrating the moment when the piston rises from bottom dead center and the lower valve of the second valve contacts the valve seat of the piston.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylinder 1A ... Valve seat 1B ... Standing wall 1C ... Stopper part 1D ... Reduced diameter part 2 ... Cap 2A ... Lip part 2B ... Virgin seal part 2B1 ... Grip piece 3 ... First valve 3A ... Rod part 3B ... Valve body 4 ... Piston 4A ... Valve seat 4B ... Upper lip part 4C ... Stopper part 4D ... Root part 5 ... Nozzle head 6 ... Second valve 6A ... Lower valve 7 ... Spring body 7A ... Cylinder base 7B ... Wave plate spring 7B1 ... Standing piece

Claims (11)

[Claims] 1. A cylinder, a cap for attaching the cylinder to a container opening, and a first plug inserted into the cylinder.
A valve, a piston slidably inserted into a cylinder, a nozzle head attached to the piston, a second valve inserted into the piston, and a composite that is inserted into the cylinder to repel the piston. A push dispenser comprising a resin spring body and a first valve, wherein the first valve is provided so as to penetrate the spring body. 2. A cylinder, a cap for attaching the cylinder to a container mouth, and a first plug inserted into the cylinder.
A valve, a piston slidably inserted into a cylinder, a nozzle head attached to the piston, a second valve inserted into the piston, and a composite that is inserted into the cylinder to repel the piston. A push dispenser comprising: a resin spring body; and a first valve having a rod portion extended until a second valve in the piston is inserted, wherein the rod portion of the first valve is inserted through the spring body. A push dispenser characterized by being arranged in a vertical direction. 3. A spring body comprising a pair of corrugated leaf springs and a cylindrical base connecting both ends of the pair of corrugated leaf springs, wherein a rod portion of the first valve is formed on the cylindrical base portion. 3. The push dispenser according to claim 2, wherein the radially standing pieces are prevented from lateral blur. 4. The push dispenser according to claim 2, wherein the virgin seal body is integrated with the cap via a detachable thin portion. 5. The push dispenser according to claim 2, wherein a return rib portion is formed on the cap, and the rib portion prevents the piston from coming off. 6. The push dispenser according to claim 2, wherein the second valve has a degree of freedom of vertical movement between a stopper portion formed on the piston and the valve seat. 7. A spring body made of synthetic resin used for a push dispenser, comprising a pair of corrugated leaf springs. 8. A spring body made of synthetic resin used for a push dispenser, the spring body comprising a pair of corrugated leaf springs and a cylindrical base connecting both ends of the pair of corrugated leaf springs. 9. The spring body according to claim 8, wherein a radially standing piece for guiding movement of the liquid is formed on the cylindrical base. 10. The spring body according to claim 7, wherein the spring body is formed of a polyolefin resin. 11. A push dispenser provided with the spring body according to claim 7.