JPH091036A - Tail end knocking structure of writing tool and liquid applying tool such as make-up tool - Google Patents

Abstract

PURPOSE: To set pushing pressure of a knocking part low in accordance with ordinary use and to improve durability to knocking operation in a tail end knocking structure of a liq. applying tool such as a writing tool and a make-up tool. CONSTITUTION: In a writing tool provided with a shaft cylinder 1 storing an ink inside, the ink is made to flow out from the apex of a pen by opening a valve provided inside by knocking a knocking part 27 provided on the tail end shaft 26 in the axial direction. The knocking part 27 has an elastic body 28 which closes the tail end shaft 26 and is returnably deformed when knocking is operated. A projected part 26a with an approximately T-shaped crosssection which projects inward from the inner peripheral face and additionally bent toward both sides in the axial direction is integrally molded out of a synthetic resin material over the whole periphery. The elastic body 28 is molded out of an elastic material after the projected part 26a is molded in such a way that the projected part 26a is supported by the outer peripheral edge part 31 under tightly contacting condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail end knock structure for a liquid applicator such as a writing implement and a cosmetic implement.

[0002]

2. Description of the Related Art Conventionally, in a writing implement in which ink is directly stored in a barrel or in a liquid applicator such as a makeup implement in which liquid cosmetics such as nail polish is stored in a barrel, ink or nail polish is discharged. A valve device is often mounted inside the barrel for the purpose of controlling the amount. As one of the knock mechanisms for opening and closing the valve, there is one in which a bellows shaft portion is provided on a shaft cylinder and the squeeze property of the bellows shaft portion is utilized to allow knocking in the axial direction. -1098080 publication, fairness 6-
18616).

[0003]

By the way, in the above-mentioned conventional liquid applicator provided with the bellows shaft portion, since the squeeze property is utilized as described above, the pressing force of the bellows shaft portion can be normally used. It is desirable to set it low to match.
Specifically, the wall thickness of the bellows shaft is 0.3 to 0.4 mm.
It is considered that it is preferable to set it to a degree. However, due to the wall thickness (usually about 0.8 mm) of the barrel of the barrel provided with the bellows, the barrel cannot be procured in a blow container by direct blow or injection blow, resulting in the bellows. It was difficult to mold the part to the above wall thickness dimension.

That is, when the bellows shaft is thinly formed, the bellows shaft is unevenly formed, or stress is concentrated on the root portion of the bellows shaft at the time of knocking, so that the root portion is cracked or damaged. There is a risk of

Further, since the bellows shaft portion is integrally formed with the barrel, if the bellows shaft portion is procured with a soft material so that the knocking operation can be easily performed, the barrel becomes soft, and the barrel is softened during use (grasping by the user). However, there is a problem in that the barrel of the barrel is easily deformed.

The present invention has been made in view of the above-mentioned problems of the prior art. The pressing force of the knock portion can be set low in accordance with normal use, and the durability of the knock portion with respect to the knock operation is improved. An object of the present invention is to provide a tail end knock structure of a liquid applicator such as a writing implement and a cosmetic implement.

[0007]

The present invention has the following configuration to achieve the above object. That is, the present invention is a liquid applicator such as a writing implement and a makeup implement having a shaft cylinder for storing the coating liquid therein, and by knocking the knock portion provided at the tail end in the axial direction, In the one in which the valve provided is opened to allow the application liquid to flow out from the pen tip, the knock portion has an elastic body that closes the tail end and deforms so as to be recoverable when a knock operation is performed. On the inner peripheral surface of, projecting inward from the inner peripheral surface,
Further, a protruding portion bent from the protruding portion toward at least one side in the axial direction is integrally molded with a synthetic resin material over the entire circumference, and the outer peripheral portion of the elastic body is in close contact with the protruding portion. The tail end knock structure of a liquid applicator such as a writing implement and a cosmetic implement, characterized in that the protrusion is formed of an elastic material after being formed so as to be grasped.

[0008]

According to the present invention, since the elastic body that is deformed when knocking is operated is separate from the barrel, the elastic body can be easily deformed without affecting the material and thickness of the barrel. Can be freely designed to facilitate knocking operation. Further, since the outer peripheral portion of the elastic body is formed so as to grip the projection portion in a close contact state, it does not come off from the projection portion even if the pressing force at the time of excessive knock is applied. Therefore, it is possible to improve the durability of the knock portion with respect to the knock operation. Further, since the outer peripheral edge of the elastic body is in close contact with the protrusion, the coating liquid in the barrel can be reliably sealed.

The "inner peripheral surface of the tail end" in the present invention means the inner peripheral surface of the tail end shaft fitted to the barrel or the inner peripheral surface of the tail end of the barrel itself.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a writing instrument that is an embodiment of the present invention. As shown in FIG. 1, the writing instrument of this embodiment is a writing instrument provided with a shaft cylinder 1 which stores ink (an example of a coating liquid) therein, and a knock portion 27 provided at a tail end is axially moved. By knocking, the valve provided inside is opened to allow the coating liquid to flow out from the pen tip.

The writing instrument includes the barrel 1, the knock portion 27 that is pressed forward to reduce the internal volume of the writing instrument when knocked, and the rear end of the knock portion 27 is connected to the barrel 1 to extend forward in the barrel 1. The large diameter portion 6a is fixed to the valve pipe 6 having the large diameter portion 6a protruding in the axial radial direction while being connected to the front end portion of the small diameter pipe 7 and the small diameter pipe 7 and being fixed to the front end opening of the shaft cylinder 1. A valve seat 2 that slidably holds the valve rod 6 at a position rearward of the valve seat 6 and that the large-diameter portion 6a abuts when not knocked and separates when knocked. Further, the writing instrument has a valve spring 8 that has a rear end abutting against the large diameter portion 6a and biases the valve rod 6 rearward.
And a guide hole 3 that is fitted into the front end of the valve seat 2 so as to support the front end of the valve spring 8 and guides the front end of the valve rod 6.
and a spring receiver 3 having c, and arranged in front of the guide hole 3c,
Further, when knocking, the pen core 10 is provided with ink supplied from the inside of the barrel 1 through the gap between the large diameter portion 6a and the valve seat 2 and the gap between the guide hole 3c and the valve rod 6.

The configuration of each unit will be described in detail. The barrel 1 is
As shown in FIG. 1, the front and rear ends are made of synthetic resin and are open. A space behind the valve seat 2 in the shaft cylinder 1 serves as an ink tank 4, and an ink stirring ball 5 is movably inserted therein. Mouth portion 1 at the front end of the barrel 1
The diameter a is smaller than that of the other portions.

The valve rod 6 has a large-diameter portion 6a at a substantially central portion in the front-rear direction.
Has a large diameter portion 6a, and a step portion 6b facing forward at the front end of the large diameter portion 6a.
Having. A rear end of the large-diameter portion 6a is a step portion 6c that is tapered in diameter, and a small-diameter portion 6 is provided behind the step portion 6c.
d is extended. Further, a connecting small diameter portion 6e is formed at the rear end of the small diameter portion 6d. Further, the small diameter portion 6d is
The connecting small diameter portion 6e at the rear end of the valve seat 2 that penetrates the rear end surface of the valve seat 2 and projects rearward is press-fitted and connected to the front end opening of the small diameter pipe 7.

The valve seat 2 has a collar portion 2a which comes into contact with the end surface of the base portion 1a of the shaft cylinder 1 and a large diameter cylindrical portion 2 which is fitted to the base portion 1a.
b, a small diameter cylindrical portion 2c protruding from the rear end of the large diameter cylindrical portion 2b into the ink tank 4, and a small diameter portion 6d of the valve rod 6 formed on the rear wall of the small diameter cylindrical portion 2c so as to be slidable. And a valve hole 2e for communicating the large-diameter cylindrical portion 2b and the small-diameter cylindrical portion 2c with each other, and an opening 2f provided in a side wall of the small-diameter cylindrical portion 2c.

A step portion 6c of the valve rod 6 can be brought into contact with and separated from the front end opening edge of the valve hole 2e, and when the knock is not made, the communication between the ink tank 4 and the large diameter cylinder portion 2b is cut off. On the other hand, at the time of knocking, the valve rod 6 moves forward so that the ink tank 4 and the inside of the large-diameter cylindrical portion 2b communicate with each other through the opening 2f.

The valve spring 8 is fitted to approximately the front half of the valve rod 6 and its front end abuts against the stepped portion 6b of the large diameter portion 6a, thereby always urging the valve rod 6 forward.

The spring receiver 3 has a collar portion 3a that abuts on the collar portion 2a of the valve seat 2, the guide hole 3c formed in the central portion of the collar portion 3a, and a large diameter cylindrical portion 2b of the valve seat 2. And a fitting portion 3b fitted in the front portion of the. The guide hole 3c is a circular hole having an inner diameter larger than the outer diameter of the front end of the valve rod 6, or a plurality of ribs formed on the inner surface of the circular hole so as to be in sliding contact with the valve rod 6.

A valve seat 2 is provided on the outer peripheral surface of the base portion 1a of the shaft cylinder 1.
Further, a front shaft 9 that holds the flange portions 2a and 3a of the spring receiver 3 between the flange portions 2a and 3a and the front end surface of the mouth portion 1a is screwed. The center hole of the front shaft 9 has a rib 9a that protrudes in the radial direction toward the center from a required position on the inner surface (position of every 120 ° in the circumferential direction).
Are formed.

The pen core 10 is held by the rib 9a of the tip shaft 9 and is made of felt, a rubber, a brush or the like. The rear end surface of the pen core 10 faces the guide hole 3c of the spring receiver 3. An intermediate diameter portion 9b is formed at a substantially central position in the axial direction of the front shaft 9, and the intermediate diameter portion 9b is formed.
A sponge body 11 is attached to the inner hole of the. The rear end of the pen core 10 is fitted into the center hole of the sponge body 11. A cap (not shown) is detachably fitted to the outer peripheral portion of the front shaft 9 in front of the barrel 1.

(Structure of Knock Section 27) The knock section 27 is
As shown in FIG. 1, the tail end shaft 26 fitted to the rear end of the barrel 1 is provided. The knock portion 27 includes an elastic body 28 that closes the tail end shaft 26 and deforms so that it can be restored when knocking,
It has a knock cap 24 that is connected to the rear surface of the elastic body 28 and that can slide back and forth on the inner peripheral surface of the tail end shaft 26 behind the elastic body 28.

The tail end shaft 26 is provided with a substantially cylindrical fixing portion 18 fitted in the rear end opening of the barrel 1 and a cover portion 15 provided at the rear portion for preventing malfunction of the knock portion 27.
It is a synthetic resin molded product that is integrally molded by injection molding. The peripheral wall of the cover portion 15 is provided with a notch 17 which is opened rearward and into which a finger can be inserted. This cutout 1
It is possible to perform a knock operation while avoiding the cover portion 15 while letting the finger escape to 7. The tail end shaft 26 is attached to the rear end opening of the barrel 1 by a fixing means such as press fitting or fusion bonding.

The inner peripheral surface of the tail end shaft 26 (an example of the inner peripheral surface of the tail end) projects inward from the inner peripheral surface, and further extends axially on both sides (both front and rear directions) from the protruding portion. The bent protrusion 26a is integrally formed over the entire circumference. Projection 2
6a has a substantially T-shaped cross section.

The elastic body 28 includes a disk-shaped thin wall 30 extending in the axial direction of the barrel 1, a pair of front and rear ribs 29a and 29b integrally formed in a rod shape at a substantially central portion of the thin wall 30, and the protrusion. 26a and the outer peripheral edge portion 31 that is formed so as to grip the inside of the tail end shaft 26 by the two-color molding machine as shown in FIG. Differently molded with elastic material. The elastic body 28
Is made of a rubber material such as an elastomer.

As shown in FIG. 1, the knock cap 24 is a taper-shaped molded product whose diameter is slightly reduced toward the rear and has a tubular rib 24a inside. The knock cap 24 has its rib 24a fitted to the rib 29b, and is held in the tail end shaft 26 by a protrusion 25 provided on the inner peripheral surface of the cover portion 15. The rib 29a on the front side of the thin wall 30 projects toward the ink tank 4 and is connected to the rear end of the small diameter pipe 7.

Here, referring to FIGS. 3 and 4, the tail end shaft 26 and the elastic body 28, which are procured as a two-color molded product, are provided.
The molding step will be described. At the time of this molding, as shown in FIG. 3, an outer mold 32 forming the outer peripheral surface of the tail end shaft 26,
The movable side core 33 that is shared by the tail end shaft 26 and the elastic body 28, the sleeve 34 that is fitted to the outer periphery of the movable side core 33 to form the fixed portion 18 of the tail end shaft 26, and the movable side core 33. A tail end shaft core 35 that is used only for forming the tail end shaft 26 in combination with the tail end shaft 26, and an elastic body that is used only for forming the elastic body 28 in combination with the movable side core 33 after forming the tail end shaft 26. Core 36 for use.

First, as shown in FIG. 3, the movable core 33 and the sleeve 34 are inserted into the outer mold 32 from one side (left side in FIG. 3) of the outer mold 32, while the tail is moved from the other side (right side in FIG. 3). The end shaft core 35 is inserted. In this state, as shown in FIG. 4, the outer mold 32, the sleeve 34, the movable side core 33, and the tail end shaft core 35 form a closed space for molding the tail end shaft 26. Protrusion 26 in this closed space
The space portion having a substantially T-shaped cross section for molding a is formed by the uneven portions 33a and 35a (see FIG. 3) provided on the movable side core 33 and the tail end shaft core 35, respectively. By injecting the synthetic resin material in this state, a molded product of the tail end shaft 26 made of synthetic resin shown in FIG. 4 is obtained.

Next, the elastic body 28 is molded, but prior to the molding, as shown by the imaginary line in FIG.
Is retracted (core back) by the thickness of the elastic body 28. At the same time, the tail end shaft core 35 is removed while leaving the molded product of the tail end shaft 26 inside the outer mold 32, and the elastic body core 36 (see FIG. 3) is inserted in its place. By inserting the elastic body core 36, a space for molding the thin wall 30 of the elastic body 28 is formed, and at the same time, the movable core 33 is formed.
A space for molding the outer peripheral edge portion 31 of the elastic body 28 is formed around the protrusion 26a by the concave-convex portion 33a and the concave portion 36a of the elastic body core 36. Furthermore, the pair of front and rear ribs 29a, 29b is formed by the circular hole portion 33b of the movable core 33 and the circular hole portion 36b of the elastic body core 36.
A space for molding is obtained. Then, by filling an elastic material into the closed space formed of these space portions, the elastic body 28 is provided in the molded product of the tail end shaft 26 in a form in which the outer peripheral edge portion 31 grips the protrusion portion 26a in a close contact state. Heterogeneous molded.

According to the present embodiment having the above-mentioned structure, the thin wall 30 is deformed by knocking the knock cap 24 of the knock portion 27 in the axial direction, and the thin pipe 7 is pressed and moved forward. . Due to the advance of the small diameter pipe 7, the valve rod 6 is advanced while compressing the valve spring 8 while being supported by the holding hole 2d of the valve seat 2 and the guide hole 3c of the spring receiver 3. Due to the forward movement of the valve rod 6, the valve hole 2 of the valve seat 2
The step 6c of the valve rod 6 is separated from the opening edge of the front end of e. Due to the opening of the valve and the reduction of the inner volume of the ink tank 4 due to the deformation of the thin wall 30, the ink in the ink tank 4 is introduced into the large-diameter cylindrical portion 2b of the valve seat 2 through the opening 2f and the valve hole 2e. It flows in and is supplied to the pen core 10 through the sponge body 11 from the gap between the guide hole 3c of the spring receiver 3 and the front end portion of the valve rod 6.

In the tail end knock structure of this embodiment,
Since the elastic body 28 that deforms during the knocking operation is provided separately from the barrel 1, the knocking operation is facilitated without affecting the material and thickness of the barrel 1. That is, the knock part 2
The elastic body 28, which is the deformable portion of 7, is made of an elastic material that is easily deformable, and since the elastic body 28 can be molded into a shape that is easily deformable, the knocking portion 27 can be easily operated without causing a problem in the barrel 1. can do.

Further, since the outer peripheral edge portion 31 of the elastic body 28 is formed so as to grip the projection portion 26a in a close contact state, the elastic body 28 can be disengaged from the projection portion 26a even when the pressing force at the time of excessive knock is applied. Absent. Therefore, the durability of the knock portion 27 against the knock operation can be improved. Further, since the outer peripheral edge portion 31 of the elastic body 28 comes into close contact with the protrusion 26a, the ink in the ink tank 4 can be reliably sealed.

The present embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment. For example, the thin wall of the elastic body 28 does not have to be a disk shape like the thin wall 30 but may be a thin wall 30A bent in a substantially V shape as shown in FIG. When molding the elastic body 28 having this thin wall 30A,
And as shown in FIG. 7, an annular valley portion 33c is formed on the movable side core 33, while as shown in FIG.
An annular crest 36c corresponding to 3c is provided in the elastic core 36, and a space for molding the thin wall 30A is formed between the annular trough 33c and the crest 36c.

The shape of the thin wall 30A has an effect that the maximum deformation amount of the elastic body 28 can be increased and the knock stroke can be set large. At the same time, in order to make it difficult to concentrate the stress on the outer peripheral edge portion 31 at the time of knocking operation,
It is possible to further improve the durability of the knock portion 27.

Further, in this embodiment, the projection 26a is provided on the tail end shaft 26 which is separate from the barrel 1, but the present invention is not limited to this, and the inner circumference of the tail end of the barrel 1 itself. A protrusion may be formed on the surface, and the elastic body 28 may be formed differently in the barrel 1 so as to grip the protrusion.

The projection according to the present invention is not limited to a substantially T-shaped cross section, but protrudes inward from the inner peripheral surface of the tail end shaft 26 like the projection 26b shown in FIG. After that, it may have a substantially L-shaped cross section that is bent only on one side in the axial direction. Further, as shown in FIG. It is also possible to eliminate the core back step described above by using only the form of gripping.

A molding process of a two-color molded product composed of the tail end shaft 26 and the elastic body 28 shown in FIG. 8 will be described with reference to FIGS. 9 and 10. In this molding, the outer mold 32,
The fixed core 37, which is commonly used for molding the tail end shaft 26 and the elastic body 28, the sleeve 38 which is fitted to the outer periphery of the fixed core 37 to form the notch 17 of the cover portion 15, and the fixed core 37 are combined. The tail end shaft core 39 used only for molding the tail end shaft 26, and the elastic body core 4 used only for molding the elastic body 28 in combination with the fixed core 37.
0 and are used.

First, as shown in FIG. 9, the fixed core 37 and the sleeve 38 are inserted into the outer mold 32 from one side (right side in FIG. 9) of the outer mold 32, while the tail end is inserted from the other side (left side in FIG. 9). The shaft core 39 is inserted. In this state, as shown in FIG. 10, the outer mold 32, the sleeve 38, the fixed core 37, and the tail end shaft core 39 form a closed space for molding the tail end shaft 26. Protrusion 26b in this closed space
The space portion having a substantially L-shaped cross section for molding the fixed core 3
7 is formed by a small-diameter step portion 37a (see FIG. 9) on the outer periphery of the tip end and an uneven portion 39a (see FIG. 9) provided on the tail end shaft core 39. Then, by injecting the synthetic resin material, a molded product of the tail end shaft 26 made of the synthetic resin shown in FIG. 10 is obtained. In this case, the fixed portion 18 of the tail end shaft 26
Is formed by the annular groove 39b of the tail end shaft core 39.

Next, the elastic body 28 is molded. In this case, the fixed core 37 is not core-backed but left in the outer die 32 together with the molded product of the tail end shaft 26, and the tail end shaft core 39 is removed. Instead, the elastic core 40 (see FIG. 9) is inserted. By mounting the elastic core 40, the fixed core 37
Circular hole 37b and circular hole 40a of the elastic core 40
As a result, a space for forming the pair of front and rear ribs 29a, 29b is obtained, and at the same time, a space for forming the substantially V-shaped thin wall 30A of the elastic body 28 is formed in the mountain of the fixed core 37. It is formed by the portion 37c and the valley portion 40b of the elastic core 40. With these spaces, the fixed core 37
The small-diameter step portion 37a and the annular end surface 40c formed on the outer side of the valley portion 40b of the elastic body core 40 form a space for molding the outer peripheral edge portion 31A of the elastic body 28.
It is formed around b. Then, the elastic material is filled in the closed space composed of these space portions to make the elastic body 2
The outer peripheral edge portion 31A is formed in a different shape in the molded product of the tail end shaft 26 in such a form that the outer peripheral edge portion 31A grips the surface of the protrusion portion 26b facing the axial center side and the surface facing the front side in a close contact state.

As described above, in the molding process of the two-color molded product shown in FIG. 8, since the molding is performed without core backing, the mold structure can be simplified and the manufacturing cost can be reduced. is there. In the two-color molded product shown in FIG. 8, the projection 26b is bent only forward, and the outer peripheral edge portion 31A of the elastic body 28 is a surface facing the axial center of the projection 26b and a surface facing forward. By making it adhere to
Although the impact from the stirring ball 5 is set to be transmitted to the protrusion 26b through the outer peripheral edge portion 31A, the protrusion 26b is bent only backward and the elastic body 28
The outer peripheral edge portion 31A may be brought into close contact with the surface of the protrusion 26b facing the axial center and the surface facing rearward.

[0039]

As described above, according to the present invention, in the tail end knock structure of a liquid applicator such as a writing implement and a cosmetic implement, the knocking portion of the knocking portion can be formed without affecting the material and thickness of the barrel. The pressing force can be set low according to normal use. In addition, the durability of the knock portion against a knock operation can be improved. Furthermore, it is possible to reliably seal the coating liquid in the barrel.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a writing instrument according to an embodiment.

FIG. 2 is a longitudinal sectional view of a tail end shaft and an elastic body according to an embodiment.

FIG. 3 is an exploded cross-sectional view of a tail end shaft and an elastic body molding die according to an embodiment.

FIG. 4 is an assembly cross-sectional view of a tail end shaft forming die according to an embodiment.

FIG. 5 is a vertical cross-sectional view of a tail end shaft and an elastic body according to a modified example of the embodiment.

FIG. 6 is an exploded cross-sectional view of a tail end shaft and an elastic body molding die according to a modification of the embodiment.

FIG. 7 is an assembly cross-sectional view of a tail end shaft forming die according to a modification of the embodiment.

FIG. 8 is a vertical cross-sectional view of a tail end shaft and an elastic body according to another modification of the embodiment.

FIG. 9 is an exploded cross-sectional view of a tail end shaft and an elastic body molding die according to another modification of the embodiment.

FIG. 10 is an assembly cross-sectional view of a tail end shaft forming die according to another modification of the embodiment.

[Explanation of symbols]

 1 shaft cylinder 2 valve seat 3 spring receiving 6 valve rod 6a large diameter part 7 small diameter pipe 8 valve spring 10 pen core 24 knock cap 26 tail end shaft 26a protruding portion 26b protruding portion 27 knock portion 28 elastic body 30 thin wall 30A thin wall Wall 31 Outer peripheral edge 31A Outer peripheral edge

Claims (1)

[Claims] 1. A liquid applicator, such as a writing implement and a cosmetic implement, having a shaft cylinder for storing the coating liquid therein, which is provided inside by knocking a knock portion provided at the tail end in the axial direction. In the one in which the valve is opened to allow the application liquid to flow out from the pen tip, the knock portion has an elastic body that blocks the tail end and deforms so that the tail end can be restored when knocking, and On the inner peripheral surface, a protrusion protruding inward from the inner peripheral surface and further bent from the protruding portion toward at least one side in the axial direction is integrally molded with a synthetic resin material over the entire circumference. The elastic body is formed of an elastic material after the molding of the protrusion so that the outer peripheral edge of the elastic body holds the protrusion in a close contact state. The tail end knock structure of the applicator.