JPH11319651A - Accumulator of pump dispenser, its production and forming die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the ventilation and productivity by forming the side wall into a stepped cylinder having a reduced-diameter part and an increased- diameter part continuous through a step, opening vent from either the inner periphery or outer periphery of the step in the axial direction and releasing the molding from the die from the vent in the axial direction. SOLUTION: The main body of the accumulator is formed into a stepped cylinder having the upper increased-diameter part 28 and lower reduced-diameter part 29 continuous through a step 27. A vent 30 is opened in the step 27. The vent 30 is opened from both the inner periphery 27i and outer periphery 27o of the step in the axial direction, and the molding has a shape capable of being released from a die when formed. Since the vent 30 is axially formed in this way, the vent 30 of the accumulator is formed only by simply opening and closing the fixed die and movable core in the axial direction, and the forming cycle time is drastically shortened and productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator of a pump dispenser which is attached to, for example, an opening of a container and discharges the contents of the container, and more particularly to an accumulator having a vent, a method of manufacturing the same, and a mold. .

[0002]

2. Description of the Related Art A conventional accumulator of this type is shown in FIG.
2 (a) and 2 (b).

That is, a cylindrical accumulator 1000
The side wall 1001 is provided with a vent hole 1002 for communicating the inside and the outside of the accumulator 1000. The accumulator 10 is opened from the inside of the container through the ventilation hole 1002.
This is to eliminate the negative pressure in the container when the content liquid is sucked at 00. The conventional ventilation hole 1002 is formed so as to penetrate in a lateral direction orthogonal to the axial direction.

[0004] Such a conventional accumulator 1000
As shown in FIGS. 12 (c) and 12 (d), a molding die 1200 for forming an outer periphery is provided with a cavity 1400 for molding the outer peripheral shape of the accumulator 1000.
A movable core 1100 inserted axially into the cavity 1400 to form the inner peripheral shape of the accumulator 1000; and a slide pin 1301 to form the vent hole 1002.
Was slidably attached to the fixed mold 1200 in the lateral direction.

As shown in FIG. 12 (d), a plurality of cavities 1400 are arranged in a fixed mold 1200 in two rows in order to take a plurality of accumulators. 1300 were provided. A slide pin 1301 corresponding to each row of cavities 1400 protrudes from each slide core 1300, and by sliding the left and right slide cores 1300, each slide pin 1301 is moved into the cavity 14.
It was designed to be inserted and removed with respect to 00.

[0006]

However, in the above-described accumulator of the conventional pump dispenser, since the ventilation hole 1002 is formed in a horizontal direction, it tends to stay when the contents adhere to the ventilation hole 1002. ,
In particular, when the contents have a high viscosity, the contents may be seized and the ventilation holes 100
2 may be blocked. If the ventilation hole 1002 is closed, the container will be deformed by decompression.

Therefore, it is conceivable to improve the air permeability by providing a plurality of ventilation holes 1002. However, in order to form the plurality of ventilation holes 1002, a plurality of slide pins 1301 are required. Becomes complicated.

[0008] The release operation of the conventional molding die is as follows.
The slide pin 1301 is retracted in the lateral direction, and then the movable core 1100 is opened in the axial direction by two operations.
If the speed at which the slide pin 1301 is pulled out is not increased, the opening speed of the movable side core 1100 will not be increased, and the molding cycle will be lengthened.

Further, even when a plurality of accumulators are taken, the fixed mold 1 is required because the slide core 1300 is provided.
Only two rows of cavities 1400 could be formed in 200 at maximum, and there was a limit in increasing the number of cavities.

Further, when the ejector head 1010 is screwed into the stem guide 1011 and locked, conventionally, the ejector head 1010 is screwed by grasping the outer periphery of the stem guide 1011 by a gripping device (not shown). There is a problem that it is difficult to grip because the width x of the outer periphery in the vertical direction is narrow. It is sufficient to increase the vertical width x of the stem guide 1011, but this would increase the height of the ejector head 1010 at the time of locking.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to improve the ventilation characteristics of ventilation holes and to increase the molding cycle speed together with the number of moldings. An object of the present invention is to provide an accumulator for a pump dispenser, a method for manufacturing the accumulator, and a molding die capable of improving cost and productivity.

[0012]

In order to achieve the above object, according to the present invention, there is provided an accumulator for a pump dispenser having a cylindrical side wall provided with a vent hole communicating between the inside and the outside. A stepped cylindrical shape having a reduced diameter portion and an increased diameter portion continuous through the portion, and the ventilation hole is formed in at least one of an inner peripheral surface and an outer peripheral surface of the step portion in an axial direction so as to form a mold; It is characterized in that the mold can be removed from the vent hole in the axial direction during molding.

Here, the axial direction means a direction parallel to the central axis of the cylindrical side wall of the accumulator.

Since the ventilation hole is formed in the stepped portion in the axial direction as described above, even if the content adheres, the content is easily dropped by its own weight, and stagnation in the ventilation hole can be prevented.

In addition, the mold can be removed from the vent by simply opening the mold in the vertical direction during molding.
The molding cycle speed can be greatly improved.

Further, since a space such as a slide core is not required in the molding die as in the related art, the number of accumulators to be formed in one molding die can be greatly increased.

It is preferable that the inner peripheral surface of the enlarged diameter portion has the same diameter as the outer peripheral surface of the reduced diameter portion or is larger than the same diameter.

Further, by making it possible to remove the mold from the vent in the axial direction, a plurality of vents can be easily formed, and the number of vents can be arbitrarily selected according to the viscosity of the contents. Becomes possible. If a plurality of air holes are provided in the circumferential direction of the side wall, air permeability is improved. In particular, by providing three or more in the circumferential direction, it is possible to eliminate the bias in the direction of the vent hole, and even if the content liquid adheres to the vent hole in one direction, the content liquid will not pass through the vent hole in the other direction. The probability that air holes in all directions will be blocked without adhesion will be reduced.

Further, a reinforcing rib extending in the axial direction is provided at a corner between the outer periphery of the step portion and the outer periphery of the reduced diameter portion.

When a tensile stress is applied to the accumulator, the stress concentrates on the step, so that the accumulator is reinforced by the reinforcing rib. Since these reinforcing ribs also extend in the axial direction, they can be die-cut in the axial direction during molding.

When the ejector head is screwed and fixed to a stem guide fixed to the opening at the upper end of the accumulator, the width of the outer periphery of the stem guide in the vertical direction is increased by using the reinforcing rib as a detent. It is possible to prevent rotation.

Furthermore, if the screwing torque is supported by the plurality of reinforcing ribs, the screwing torque is dispersed and alleviated by the respective reinforcing ribs, so that the tightening force can be increased and the ejector head can be securely fixed. it can.

Further, the method of manufacturing an accumulator for a pump dispenser according to the present invention is characterized in that an outer peripheral molding die provided with a cavity for molding an outer peripheral surface of the accumulator, and an inner peripheral surface of the accumulator inserted into the cavity are provided. The mold for molding the inner periphery and the mold for molding can be freely opened and closed in the axial direction, and a step outer peripheral surface forming portion for molding the step outer peripheral surface of the accumulator side wall is provided on the inner peripheral surface of the cavity of the outer peripheral molding die. In addition, a stepped inner peripheral surface forming portion for forming the stepped inner peripheral surface of the accumulator side wall is provided in the inner peripheral forming die, and the stepped outer peripheral surface forming portion and the inner peripheral forming die of the outer peripheral forming die are provided. At least one of the stepped portion and the inner peripheral surface forming portion of the mold is provided with a protrusion for forming an air hole that protrudes in the axial direction, and the outer peripheral forming die and the inner peripheral forming die are axially closed. hand After filling the molding material into the cavity in which the inner peripheral molding die is inserted, and curing the molding material, the inner peripheral molding die and the outer peripheral molding die are opened in the axial direction at the same time through the vent holes. It is characterized in that the accumulator is released from the mold by removing the protrusion in the axial direction.

[0024] The accumulator forming die of the pump dispenser of the present invention comprises: an outer peripheral forming die provided with a cavity for forming an outer peripheral surface of the accumulator;
An inner peripheral molding die inserted into the cavity for molding the inner peripheral surface of the accumulator; and an inner peripheral molding die that is freely openable and closable in the axial direction. Providing a stepped portion outer peripheral surface forming portion for forming a surface, and providing a stepped portion inner peripheral surface forming portion for forming the stepped inner peripheral surface of the accumulator side wall in the inner peripheral forming die; A feature is provided in which at least one of the step outer peripheral surface forming portion of the mold and the step inner peripheral surface forming portion of the inner peripheral forming die is provided with a projection for forming an air vent that protrudes in the axial direction.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

FIG. 3 shows an accumulator according to a first embodiment of the present invention and a pump dispenser to which the accumulator is applied.

First, the pump dispenser 1 will be briefly described. The pump dispenser 1 has a cylindrical accumulator 2, a piston 3 inserted into the accumulator 2 so as to be able to reciprocate, and a piston 3 always facing upward. A spring 4 for urging the measuring chamber Q in a direction to expand the inside thereof, a stem 5 extending upward from the piston 3 in the axial direction, an ejector head 6 connected to an upper end of the stem 5, and a lateral side from the ejector head 6 , A stem guide 8 for guiding the stem 5, a suction valve mechanism 9 provided at the bottom of the accumulator 2, which is opened at the time of suction and closed at the time of discharge, and provided in the discharge passage 10 on the inner periphery of the stem 5 at the time of suction. And a discharge valve mechanism 11 that is closed and opened at the time of discharge.

The illustrated state is a locked state during transportation or the like.
The male screw portion 6a provided on the ejector head 6 is screwed and fixed to the female screw portion 8a provided on the inner periphery of the stem guide 8.

At the time of use, the ejector head 6 is detached from the stem guide 8 and the ejector head 6 is moved by the ejector head 6.
Is reciprocated to expand the volume of the measuring chamber Q between the bottom wall 23 of the accumulator 2 and the piston 3 at the time of suction, thereby sucking the content liquid in the container into the accumulator 2,
At the time of discharge, the volume of the measuring chamber Q is contracted to discharge the liquid in the accumulator 2.

The accumulator 2 is a cylindrical member having a bottom and a cylindrical shape having an open upper end. The accumulator 2 is connected to a stepped cylindrical side wall 22, a bottom wall 23 at the lower end of the side wall 22, and a dip tube 14 projecting downward from the bottom wall 23. Connecting cylinder portion 24, and fixed flange portion 25 which protrudes radially outward from the upper end of side wall 22 and engages with the upper end of container opening neck 12 which is the container opening.
And an annular wall 26 protruding upward from the upper surface of the fixed flange portion 25, and the side wall 22 is provided with a ventilation hole 30 for communicating the inside and the outside of the accumulator 2.

The vent hole 30 prevents the container from being decompressed and deformed by introducing outside air through the vent hole 30 by the volume of the content liquid sucked into the accumulator 2 from the inside of the container during the suction stroke.

The accumulator 2 is fastened and fixed to the container neck 12 by a container cap 13. That is, the container cap 13 is
An inward flange 1 provided at the upper end thereof has a female screw portion 13a screwed to a male screw portion 12a provided on the outer periphery.
3b, the fixed flange portion 25 at the upper end of the accumulator 2 is axially sandwiched and fixed between the upper end of the container neck portion 12 and the upper end thereof.

Next, the shape of the side wall 22 of the accumulator 2 will be described in detail with reference to FIG.

The side wall 22 of the accumulator main body 2 has a stepped cylindrical shape having an upper enlarged diameter portion 28 and a lower reduced diameter portion 29 which are continuous via a step portion 27. An opening is formed in the axial direction. The step 27 is inclined so as to gradually increase its diameter upward in the axial direction. The enlarged diameter portion 28 and the reduced diameter portion 29 are both cylindrical, and the enlarged diameter portion 28 is larger in diameter than the reduced diameter portion 29 by the width of the step portion 27.

In this embodiment, the inner peripheral surface 2 of the enlarged diameter portion 28
8i, the outer peripheral surface 29o of the reduced diameter portion 29 has the same diameter, and the inner peripheral surface 28i of the enlarged diameter portion is provided with a draft that increases in diameter upward.

The enlarged diameter portion 28 has an enlarged diameter near the upper end of the container neck portion 12, and the vent hole 30 is provided in the accumulator main body 21.
At the position that opens in the gap between the outer circumference and the inner circumference of the container neck 12,
A plurality of them are arranged in the circumferential direction, three or more in this embodiment. Thus, by providing three or more places in the circumferential direction, it is possible to eliminate the bias in the direction of the vent hole 30,
Even if the content liquid adheres to the vent hole 30 in one direction, the content liquid does not adhere to the vent hole 30 in the other direction, and the probability that the vent holes 30 in all directions are closed is reduced.

The ventilation hole 30 formed in the step portion 27 is axially opened from both the step inner peripheral surface 27i and the step outer peripheral surface 27o, and is formed into a shape that can be axially removed at the time of molding. ing. That is, the vent hole 30 has an outer hole portion 31 formed in the axial direction from the step portion outer peripheral surface 27o with the cylindrical surface S extending from the enlarged diameter portion inner peripheral surface 28i and the reduced diameter portion outer peripheral surface 29o as a boundary. It can be divided into an inner hole 32 that is formed in the axial direction from the inner peripheral surface 27i and that communicates with the outer hole 31.

The outer hole 31 has a stepped outer peripheral surface 27o with a predetermined width, and is cut out from the lower end thereof along the cylindrical surface S in the axial direction upward, and the upper bottom surface 31a is formed at the upper end of the stepped portion 27. And the notch depth reaches the entire thickness of the step 27.

On the other hand, the inner hole 32 is formed in the step portion inner peripheral surface 27.
i has the same width as the outer hole portion 31 and has a shape cut out axially downward from the upper end thereof along the cylindrical surface S,
The lower bottom surface 32a extends to an intermediate position of the step portion 27. Therefore, the inner hole 32 overlaps the upper half of the outer hole 31. Of course, the inner hole 32 may be cut out to the lower end position of the step inner circumferential surface 27i so as to entirely overlap the outer hole 32.

Next, a method for manufacturing the accumulator and a mold will be described with reference to FIG.

The molding die includes a fixed die 120 as an outer peripheral molding die in which a cavity C for molding the outer peripheral shape of the accumulator 2 is inserted, and an inner peripheral shape of the accumulator 2 inserted into the cavity C. And a movable core 110 as an inner periphery forming die to be formed. A step portion inner peripheral surface forming portion 111 for forming the inner peripheral surface of the step portion 30 on the outer periphery of the movable side core 110, an enlarged diameter portion inner peripheral surface forming portion 112.
In addition, a reduced diameter portion inner peripheral surface forming portion 113 is provided. Further, a stepped portion 3 is formed on the inner peripheral surface of the cavity C of the fixed mold 120.
Step outer peripheral surface forming portion 12 for forming outer peripheral surface of zero
1, an outer peripheral surface forming portion 122 having an enlarged diameter portion and an outer peripheral surface forming portion 123 having a reduced diameter portion are provided.

Then, the step inner peripheral surface forming portion 111 of the movable core 110 and the step outer peripheral surface forming portion 12 of the fixed die 120 are formed.
1 includes inner and outer protrusions 11 for forming ventilation holes, respectively.
4,124 are provided. Inside and outside projections 11
Reference numerals 4 and 124 are formed into shapes conforming to the inner peripheral shape of the vent holes 30 to be formed and the inner peripheral shapes of the outer hole portions 32 and 31.

That is, the inner protrusion 114 has a substantially square lower bottom forming portion 114a for forming the lower bottom surface 31a of the inner hole 32, and a substantially triangular inner surface for forming the left and right inner side surfaces of the inner hole 32. Side forming portions 114b and 114c and a rubbing surface 114d formed by an extension surface of the enlarged-diameter portion inner peripheral surface forming portion 112 are provided.

The outer protrusion 124 has an outer hole 3
1 upper bottom surface forming portion 124a for forming the upper bottom surface 32a, substantially triangular inner surface forming portions 124b and 124c for forming the left and right inner surfaces of the outer hole portion 31, and a reduced diameter portion inner peripheral surface. A back forming portion 124e formed by an extension surface of the forming portion 123, and a rubbing surface 124d which is continuous with the back forming portion 124e and can be rubbed in the axial direction with a rubbing surface 114d of the inner protrusion 114. I have.

The molding is performed as follows.

First, the movable core 110 is inserted into the cavity C of the fixed mold 120 in the axial direction, and the mold is closed. At this time, the inner protrusion 114 provided on the step inner peripheral surface forming portion 111 of the movable core 110 and the outer protrusion 124 provided on the step outer peripheral surface forming portion 121 of the fixed die 120 are rubbed with each other. 124d slide and come in close contact with each other.

Next, the melted resin material R is poured into the cavity C
After the resin material is cured, the movable core 1 is filled.
The mold 10 is lifted in the axial direction from the fixed mold 120 and released.
At this time, the rubbing surfaces 114d and 124d of the inner protrusion 114 and the outer protrusion 124 slide and release.

By forming the ventilation holes 30 in the axial direction as described above, the fixed mold 120 and the movable core 1 are simply formed.
Since the vent hole 30 of the accumulator 2 can be formed only by opening and closing the shaft 10 in the axial direction, the molding cycle time can be greatly reduced, and the productivity is dramatically improved.

Further, by making it possible to release the mold from the ventilation hole 30 in the axial direction, it is possible to easily form the plurality of ventilation holes 30 and to increase the number of the ventilation holes 30 according to the viscosity of the contents. Can be arbitrarily selected.

Further, since there is no need to provide a space for a slide core that slides in a direction perpendicular to the axial direction as in the conventional case, for example, as shown in FIG. It is possible to arrange them densely, greatly increasing the number of accumulators, eliminating the need for slide core removal time, and significantly improving productivity in conjunction with the shortening of the molding cycle time described above. it can. Of course, a plurality of movable cores 110 are also provided corresponding to the cavities C, and are provided integrally with a movable mold (not shown) corresponding to the fixed mold 120.

In the above description, the inner peripheral surface 27 of the step 27
The ventilation holes 30 are formed in the axial direction from both the i and the outer peripheral surface 27o. However, as shown in FIG. 4, the ventilation holes 30 are formed only from the outer peripheral surface side or only from the inner peripheral surface side. Is also good.

FIG. 4A shows that the ventilation hole 30 is formed on the outer peripheral surface 27 of the step portion.
It is constituted only by the outer hole 31 on the o side.

In this case, an opening 33 that opens in a direction orthogonal to the axial direction is formed on the inner peripheral surface 28i of the enlarged diameter portion.

As shown in FIGS. 4 (b) to 4 (d), the shape of the mold for forming the vent hole 30 is such that the stepped portion inner peripheral surface forming portion 111 of the movable core 110 has no projection and is fixed. Type 12
Only the second protrusion 124 is provided on the outer peripheral surface forming portion 121 of the step portion 0. The movable side core 1 is
The inner peripheral surface forming portion 112 of the ten enlarged diameter portions is provided with a rubbing surface 124d that can be rubbed in the axial direction.

FIG. 4E shows that the ventilation hole 30 is formed on the inner peripheral surface 27 of the step portion.
It is constituted only by the inner hole 32 on the i side.

In this case, an opening 34 that opens in a direction perpendicular to the axial direction is formed on the outer peripheral surface 29o of the reduced diameter portion.

As shown in FIGS. 4F to 4H, the shape of the mold for forming the ventilation hole 30 is such that the stepped portion outer peripheral surface forming portion 121 of the fixed die 120 has no projection and is movable. Side core 1
Only the inner protrusion 114 is provided on the inner peripheral surface forming portion 111 of the step portion 10. This inner projection 114 has a fixed mold 12
0 is provided with a rubbing surface 114d that can be rubbed in the axial direction with the outer diameter forming portion 123 of the reduced diameter portion.

[Second Embodiment] FIGS. 5 and 6 show an accumulator of a pump dispenser according to a second embodiment of the present invention.

Since the basic configuration of the accumulator and the configuration of the pump dispenser are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted.

Also in this embodiment, the side wall 22 of the accumulator has a stepped cylindrical shape having an upper enlarged diameter portion 228 and a lower reduced diameter portion 229 which are continuous via a step portion 227. In this embodiment, a ventilation hole 230 is formed in the axial direction.
As shown in detail, the step portion 227 projects from the upper end of the reduced diameter portion 229 outward in the radial direction orthogonal to the axial direction, and the inner peripheral surface 228 i of the enlarged diameter portion has the outer peripheral surface 229 of the reduced diameter portion 229.
The difference from the first embodiment is that the diameter is larger by a predetermined width than o.

Further, a plurality of reinforcing ribs 40 are provided in the circumferential direction on the step portion outer periphery 227o as shown in FIG. The reinforcing rib 40 is a protruding piece extending in the axial direction downward from the step portion 227, and is formed so as to protrude across a corner portion between the outer periphery 229o of the reduced diameter portion and the outer periphery 227o of the step portion.
Since the reinforcing ribs 40 also extend in the axial direction, they can be die-cut in the axial direction during molding.

When the ejector head 6 is pushed in and screwed into the stem guide 8 and locked, the side wall 22 of the accumulator 2 is pulled in the axial direction through the stem guide 8 by the spring force of the contracted spring 4. Sidewall 22
The stress concentrates on the step 227 provided in the step S, but since the step 227 is reinforced by the reinforcing ribs 40, the locked state is reliably maintained.

When the ejector head 6 is locked to the stem guide 8 during the assembling process, the reinforcing rib 40 of the accumulator 2 can be used as a detent by fixing the stem guide 8 to the accumulator 2. it can. By using the reinforcing ribs 40 as detents, the detents can be reliably prevented at the time of locking without increasing the vertical width of the outer periphery of the stem guide 8, thereby improving workability. Further, the screwing torque is distributed to the plurality of reinforcing ribs 40, and the individual reinforcing ribs 40
Since the screwing torque acting on the screw is reduced, the screwing torque can be increased to ensure the fixing.

The ventilation hole 230 formed in the step portion 227
As shown in FIG. 6, is formed into a shape that can be die-cut in the axial direction at the time of molding, and in the illustrated example, is constituted by a linear hole penetrating in the axial direction through the step inner peripheral surface 227i and the step outer peripheral surface 227o. .

The vent hole 230 is formed on the inner peripheral surface 228 of the enlarged diameter portion.
Large-diameter cylindrical large-diameter reference surface S1 including i and reduced-diameter portion outer peripheral surface 2
It is formed in the central region of the step 27 which is separated from the cylindrical small-diameter reference surface S2 including 29o. The vent hole 230 is a circular hole having the same diameter and a circular cross section over the entire length in the axial direction, and can be formed in the axial direction from either the step inner peripheral surface 227i or the step outer peripheral surface 227o. The cross-sectional shape of the ventilation hole 230 is not limited to a circular shape, but may be an arc shape,
Various shapes such as a square shape and a triangular shape can be adopted.

Instead of making the ventilation holes 230 have the same diameter in the axial direction,
For example, a shape having a gradually decreasing diameter such as a conical shape may be used. In this case, the mold may be cut out from the larger diameter of the opening of the step inner peripheral surface 227i and the step outer peripheral surface 227o.

Next, a method of manufacturing the accumulator and a mold will be described with reference to FIG.

The molding die includes a fixed die 220 as an outer peripheral molding die in which a cavity C for molding the outer peripheral shape of the accumulator 2 is inserted, and an inner peripheral portion of the accumulator 2 which is inserted into the cavity C in the axial direction. And a movable core 210 as an inner periphery molding die for molding the shape.

A step 227 is provided on the outer periphery of the movable core 210.
A step inner peripheral surface forming portion 211 for forming an inner peripheral surface of
An enlarged-diameter portion inner peripheral surface forming portion 212 for molding the enlarged-diameter portion inner peripheral surface 228i and a reduced-diameter portion inner peripheral surface forming portion 213 for molding the reduced-diameter portion inner peripheral surface 229i are provided.

The inner peripheral surface of the fixed die 220 has a step outer peripheral surface forming portion 22 for forming the outer peripheral surface of the step portion 227.
1, a large-diameter portion outer peripheral surface forming portion 222 for forming the large-diameter portion outer peripheral surface 228o, and a reduced-diameter portion outer peripheral surface forming portion 223 for forming the reduced-diameter portion outer peripheral surface 229o.

Then, a pin 2 as a projection for forming a ventilation hole is provided on the inner peripheral surface forming portion 211 of the stepped portion of the movable side core 210.
14 are protruded. This pin 214 is
It has a solid cylindrical shape that matches the inner peripheral shape of.

As shown in FIG. 7D, a vertical groove 226 for forming the reinforcing rib 40 is appropriately provided in the step outer peripheral surface forming portion 221 of the fixed die 220. Flute 2
The pin 26 and the pin 214 are arranged with their phases shifted in the circumferential direction.

The molding is performed as follows.

First, as shown in FIG. 7A, the movable core 210 is inserted in the cavity C of the fixed mold 220 on the fixed side in the axial direction, and the mold is closed. At this time, the movable side core 210
The lower end of the pin 214 provided on the step portion inner peripheral surface forming portion 211 is in close contact with the flat step portion outer peripheral surface forming portion 221 of the fixed die 220.

Next, the molten resin material R is supplied to the cavity C
After the resin material is cured, the movable core 210 is lifted in the axial direction from the fixed mold 220 and released from the mold, as shown in FIG. 7B. At this time, the pin 214 is
30 and the reinforcing ribs 40 are axially withdrawn from the longitudinal grooves of the fixed mold 220.

Also in the case of the present embodiment, since the vent hole 230 can be formed by simply opening and closing in the axial direction, the molding cycle time can be greatly shortened, and the productivity is dramatically improved.

As a matter of course, as shown in FIG. 7E, a pin 224 may be protruded from the step outer peripheral surface forming portion 221 of the fixed die 220.

FIG. 8 shows a modification of the ventilation hole according to the second embodiment.

The vent hole 330 is formed not only in the central region between the large-diameter reference surface S1 and the small-diameter reference surface S2 of the step, but also in the outer region from the large-diameter reference surface S1 to the enlarged-diameter portion outer peripheral surface 228o.
The opening is formed in a substantially square shape over the entire width of the step portion 227 from the small diameter reference surface S2 to the inner region from the reduced diameter portion inner peripheral surface 229i. That is, the ventilation hole 330 can be divided into an outer hole 331, a center hole 332, and an inner hole 333. The central hole 332 penetrates in the up-down direction, but the upper end of the outer hole 331 has an enlarged diameter portion 228.
An upper bottom surface 331 a corresponding to the thickness of the reduced diameter portion 329 exists at the lower end of the inner hole 333.

The outer hole 331 needs to be formed axially upward from the step outer peripheral surface 227o, and the inner hole 333 must be formed axially downward from the step inner peripheral surface 227i. There is a central hole 332
The opening can be formed in the axial direction from any of the step inner peripheral surface 227i and the step outer peripheral surface 227o.

FIG. 9 shows a molding die for molding the ventilation hole 330 and a molding method therefor.

That is, as shown in FIGS. 9A to 9C,
A first protrusion 215 is provided at a corner between the step inner peripheral surface forming portion 211 and the reduced diameter portion inner peripheral surface forming portion 213 of the movable core 210.
However, a second projection 225 is provided at a corner between the step outer peripheral surface forming portion 221 and the enlarged diameter portion outer peripheral surface forming portion 222 of the fixed die 220.

The first projection 215 is for forming half of the inner hole 333 and the center hole 332 of the ventilation hole 330, and the second projection 225 is for forming the outer hole 332 and the center hole 332 of the ventilation hole 330. Form half.

The first and second projections 215 and 225 have push-cut surfaces 215a and 215 which engage with each other when the mold is closed.
25a is provided. The pressed surfaces 215a, 215
25a is gradually inclined at the same angle radially outward toward the upper side in the axial direction. Also, the first protrusion 2
15 has an engagement groove 215b that engages with a rounded corner between the step outer peripheral surface forming portion 221 and the reduced diameter outer peripheral surface forming portion 223 of the fixed die 220 when the mold is closed.
5 is provided with an engaging groove 225b that engages with a rounded corner between the stepped inner peripheral surface forming portion 211 and the reduced diameter portion outer peripheral surface forming portion 213 of the movable core 210 when the mold is closed.

The molding is performed as follows.

First, as shown in FIG. 9D, the movable core 210 is axially inserted into the cavity C of the fixed mold 220 on the fixed side, and the mold is closed. At this time, the first protrusion 215
The press-cut surfaces 215a, 225a of the second protrusion 225 are pressed against each other, and the engagement grooves 215b, 225
b engages with the corners of the fixed die 220 and the movable core 210, respectively.

Next, the melted resin material R is poured into the cavity C
After the resin material is hardened, the movable core 210 is lifted in the axial direction from the fixed mold 220 and released from the mold, as shown in FIG. At this time, the first and second protrusions 21
5, 225 are withdrawn from the ventilation hole 230 in the axial direction.

The configuration of the mold for forming the ventilation holes 330 can take various configurations other than the configuration shown in FIG. One example is shown in FIG.

The example shown in FIG.
Rubbing surfaces 215c and 215, which can rub the contact portion of the second protrusion 225 in the axial direction as in the first embodiment.
25c.

The example shown in FIG. 10B shows the first projection 215
This is an example in which the abutting portions of the first and second protrusions 225 are configured by combining abutting surfaces 215d and 225d orthogonal to the axial direction and rubbing surfaces 215e and 225e that can be rubbed in the axial direction.

FIG. 10C shows that only the outer hole 331 of the ventilation hole 330 is formed by the second projection 225, and the center hole 332 and the inner hole 333 of the ventilation hole 330 are formed by the first projection 215. It is something to do. The first protrusion 215 and the second protrusion 225 are rubbed with each other by a rubbing surface 215c,
225c.

FIG. 10 (d) shows that only the inner hole 333 of the ventilation hole 330 is formed by the first projection 215, and the center hole 332 of the ventilation hole 330 is formed by the second projection 225.
And the outer hole portion 331 is formed.

Further, the ventilation hole 330 shown in FIG. 8 is configured to include the outer, center, and inner holes 331, 332, and 333. However, as shown in FIG. The good thing is, of course.

For example, FIG. 11A shows an example in which the ventilation hole 330 is composed of only the outer hole 331 and the center hole 332, and FIG. 11B shows that the ventilation hole 330 has the center hole 332 and the inner hole 3.
FIG. 11C shows an example in which the ventilation hole 330 is composed only of the inner hole 333, and FIG. 11D shows an example in which the ventilation hole 330 is composed only of the outer hole 331.

The step 27 of the first embodiment may be formed in a direction perpendicular to the axial direction as in the second embodiment, or may be formed in the second embodiment. The step portion 227 of the embodiment may be inclined in a tapered shape as in the first embodiment.

However, when the inner peripheral surface 28i of the enlarged diameter portion and the outer peripheral surface 29o of the reduced diameter portion have the same diameter as in the first embodiment, the overhang width of the step portion 27 is small, and Since the opening width cannot be increased in the radial direction, it is possible to increase the opening width of the vent hole 30 by providing a taper.

When the diameter of the inner peripheral surface 28i of the enlarged diameter portion is set to be larger than the diameter of the outer peripheral surface 29o of the reduced diameter portion by a predetermined width as in the second embodiment, the diameter of the step portion 227 in the radial direction is reduced. The overhang width is large, and if it is tapered, it will increase in the axial direction. Therefore, it is preferable to set the projection at right angles to the axial direction.

[0098]

As described above, according to the present invention,
Since the vent hole is formed in the stepped portion in the axial direction, even if the contents adhere, it is easy to drop by its own weight, and the stagnation in the vent hole can be prevented.

Further, at the time of molding, the mold can be removed from the vent hole portion only by opening the mold in the vertical direction, and the molding cycle speed can be greatly improved.

Further, since a space such as a slide core is not required in the molding die as in the related art, the number of accumulators to be formed in one molding die can be greatly increased.

Further, by making it possible to remove the mold from the vent in the axial direction, a plurality of vents can be easily formed, and the number of vents can be arbitrarily selected according to the viscosity of the contents. Becomes possible. If a plurality of ventilation holes are provided in the circumferential direction of the side wall as described above, air permeability is improved.

Further, if a reinforcing rib extending in the axial direction is provided at a corner between the outer periphery of the step portion and the outer periphery of the reduced diameter portion, the step portion can be reinforced when a tensile stress is applied to the accumulator. Since these reinforcing ribs also extend in the axial direction, they can be die-cut in the axial direction during molding.

When the ejector head is screwed and fixed to the stem guide fixed to the opening at the upper end of the accumulator, the vertical width of the outer periphery of the stem guide is increased by using the reinforcing rib as a detent. It is possible to prevent rotation. Further, if the screwing torque is supported by the plurality of reinforcing ribs, the screwing torque is dispersed and alleviated by the respective reinforcing ribs, so that the tightening force can be increased and the ejector head can be securely fixed.

[Brief description of the drawings]

FIG. 1 shows the vicinity of a vent of an accumulator of a pump dispenser according to a first embodiment of the present invention. FIG. 1 (a) is a longitudinal sectional view, and FIG. 1 (b) is an inner peripheral surface side. (C) is a perspective view seen from the outer peripheral surface side.

2 (a) is a longitudinal sectional view showing the vicinity of an air hole of a mold of the accumulator of FIG. 1, FIG. 2 (b) is a partial perspective view of a movable side core of FIG. 2 (a), and FIG. (A) is a partial perspective view of the fixed mold shown in FIG. (A), (d) to (f) are explanatory views of a molding process, and (g) is an explanatory view of a mold having a plurality of parts.

FIG. 3A is an overall vertical sectional view of a pump dispenser to which the accumulator of FIG. 1 is applied, and FIG.
It is a half sectional front view of the accumulator of (a).

4 (a) is a longitudinal sectional view showing a modified example of the vent hole of the accumulator of FIG. 1, and FIG. 4 (b) is a partial cross section showing the vicinity of the vent hole of the mold of the accumulator of FIG. 1 (a). Figure, same figure
(c) is a partial perspective view of the movable side core of FIG. (b), FIG. (d) is a partial perspective view of the fixed type of FIG. (b), and (e) is a vent of the accumulator of FIG. Longitudinal sectional view showing another modified example of FIG.
(f) is a partial cross-sectional view showing the vicinity of the ventilation hole of the mold of the accumulator of FIG. (e), FIG. (g) is a partial perspective view of the movable side core of FIG. (f), and FIG. It is a partial perspective view of the fixed type of FIG.

FIG. 5 is a front view of an entire half section of a pump dispenser to which an accumulator according to a second embodiment of the present invention is applied.

6 (a) is a partially enlarged sectional view of the vicinity of a vent hole of the accumulator of FIG. 5, and FIG. 6 (b) is a perspective view of the accumulator viewed from the inner peripheral surface side of FIG. 6 (a).

7 shows the vicinity of a vent forming portion of the mold of the accumulator of FIG. 6, wherein FIG. 7 (a) is a partial longitudinal sectional view of the mold closed state, and FIG. 7 (b) is the mold open state. Partial longitudinal sectional view, same figure
(c) is a partial perspective view of a movable core, (d) is a partial perspective view of a fixed type, and (e) is a partial longitudinal sectional view of a modified example of a pin in a mold closed state.

FIGS. 8A and 8B show a modified example of the vent hole of the accumulator according to the second embodiment. FIG. 8A is a sectional view showing the vicinity of the vent hole, and FIG. (C) is a side view as viewed from the outer peripheral side, FIG. (D) is a side view as viewed from the inner peripheral side, and FIG. (E) is a bottom view of FIG. , And FIG.
It is a top view of (a).

9 is a view showing the vicinity of an air hole forming part of a forming die of the accumulator of FIG. 8, wherein FIG. 9 (a) is a partial longitudinal sectional view of a closed state of the accumulator, and FIG. Partial perspective view, FIG.
FIG. 4 is a partial perspective view of a fixed mold, and FIGS. 4D and 4E are explanatory views of a molding process.

10 (a) to 10 (d) are partial cross-sectional views in the vicinity of a vent forming part showing various modified examples of the forming die of the accumulator of FIG.

11 (a) to 11 (d) are partial sectional views showing still another modified example of the vent of the accumulator of FIG.

12 (a) is a longitudinal sectional view of a conventional pump dispenser, FIG. 12 (b) is a half sectional front view of the accumulator of FIG. 12 (a), and FIG. FIG. 3D is a partial cross-sectional view of the vicinity of the part, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump dispenser 2 Accumulator 4 Spring 6 Ejector head 8 Stem guide 22 Side wall 27 Step part 28 Enlarged diameter part 29 Reduced diameter part 30 Vent hole 31 Outer hole part 32 Inner hole part 110 Movable core 111 Step part inner peripheral surface forming part 114 Inside Projection 114d Rubbing surface 120 Fixed mold 121 Stepped part outer peripheral surface forming part 124 Outer part 124d Rubbing surface 130 Molding die C cavity 227 Stepped part 228 Large diameter part 229 Reduced diameter part 230 Vent hole 330 Vent hole 331 Outside hole part 332 Central hole 333 Inner hole 210 Movable core 211 Step inner peripheral surface forming portion 214 First protrusion 214d Rubbing surface 220 Fixed mold 221 Step outer peripheral surface forming portion 224 Second protrusion 226 Vertical groove 40 Reinforcement rib

Claims (6)

[Claims] 1. An accumulator for a pump dispenser having a cylindrical side wall provided with a vent hole communicating between the inside and the outside, wherein a stepped tube having a reduced diameter portion and an enlarged diameter portion connected to the side wall via a step portion. A pump, wherein the vent hole is formed in at least one of the inner peripheral surface and the outer peripheral surface of the step portion in the axial direction, and the mold can be axially removed from the vent hole during molding. Dispenser accumulator. 2. The accumulator of a pump dispenser according to claim 1, wherein the inner peripheral surface of the enlarged diameter portion has the same diameter as or larger than the same diameter as the outer peripheral surface of the reduced diameter portion. 3. The accumulator of a pump dispenser according to claim 1, wherein a plurality of ventilation holes are provided in a circumferential direction of the side wall. 4. The accumulator of a pump dispenser according to claim 1, wherein a reinforcing rib extending in the axial direction is provided at a corner between the outer periphery of the step portion and the outer periphery of the reduced diameter portion. 5. An outer peripheral molding die provided with a cavity for molding an outer peripheral surface of an accumulator, and an inner peripheral molding die inserted into the cavity and molding an inner peripheral surface of the accumulator. A stepped outer peripheral surface forming portion for forming a stepped outer peripheral surface of an accumulator side wall is provided on an inner peripheral surface of the cavity of the outer peripheral forming die, and an accumulator side wall is provided on the inner peripheral forming die. Providing a step portion inner peripheral surface forming portion for molding the step portion inner peripheral surface, at least one of a step portion outer peripheral surface forming portion of the outer peripheral forming die and a step portion inner peripheral surface forming portion of the inner peripheral forming die. On one side, a protrusion for forming an air hole protruding in the axial direction was provided, and the outer peripheral forming die and the inner peripheral forming die were closed in the axial direction, and the inner peripheral forming die was inserted. Fill the cavity with molding compound A pump dispenser characterized in that, after the molding material has hardened, the inner peripheral mold and the outer peripheral mold are opened in the axial direction, and at the same time, the protrusions are removed in the axial direction from the ventilation holes to release the accumulator. Manufacturing method of accumulator. 6. An outer peripheral molding die provided with a cavity for molding an outer peripheral surface of an accumulator, an inner peripheral molding die inserted into the cavity and for molding an inner peripheral surface of the accumulator, Is axially openable and closable, and a step portion outer peripheral surface forming portion for forming the step outer peripheral surface of the accumulator side wall is provided on the inner peripheral surface of the cavity of the outer peripheral forming die, and the inner peripheral forming die is provided with A step portion inner peripheral surface forming portion for forming the step portion inner peripheral surface of the accumulator side wall is provided. A molding die for an accumulator of a pump dispenser, characterized in that at least one of the projections is provided with a projection for molding an air vent that protrudes in the axial direction.