JP3719765B2 - Tail-end knock structure for liquid applicators such as writing utensils and cosmetics - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tail end knock structure of a liquid applicator such as a writing instrument and a cosmetic tool.
[0002]
[Prior art]
Conventionally, in a liquid applicator such as a writing instrument in which ink is stored directly in the shaft cylinder or a liquid cosmetic such as a nail polish liquid stored in the shaft cylinder, the discharge amount of the ink or nail polish liquid is controlled. For this purpose, a valve device is often mounted inside the shaft tube. As one of the valve opening / closing knock mechanisms, a bellows shaft portion is provided in a shaft cylinder, and the squeeze property of the bellows shaft portion can be used for knocking in the axial direction (Japanese Utility Model Sho 62). -109980 and Japanese Utility Model Publication No. 6-18616).
[0003]
For example, the conventional valve device shown in the above-mentioned Japanese Utility Model Publication No. 6-18616 includes a small-diameter pipe that extends forward from the inner surface of the bellows shaft portion in the shaft cylinder, and a valve rod connected to the tip of the small-diameter pipe, A valve seat that comes into contact with a tapered step provided on the valve stem to seal the inside of the shaft cylinder, and the step portion is detached when the valve stem moves forward, and a front surface of the step portion of the valve stem. Are mainly composed of a valve spring that abuts the rear end thereof to urge the valve rod rearward, and a spring receiver that receives the front end of the valve spring and has a coating liquid hole in the center.
[0004]
According to this valve device, the user presses the bellows shaft portion forward and moves the valve stem forward through the small-diameter pipe so that the application liquid is provided between the step portion of the valve stem and the valve seat. The coating liquid can be supplied to the pen core through the hole. On the other hand, when the bellows shaft portion is released from the pressing force of the user, the valve rod moves rearward by the biasing force of the valve spring, the stepped portion and the valve seat come into contact with each other, and the inside of the shaft tube is sealed.
[0005]
Normally, this type of liquid applicator is assembled by filling the shaft tube with the coating liquid and then attaching the thin pipe serving as the connecting member into the shaft cylinder with the valve device attached to the front end of the thin pipe. The rear end of the small-diameter pipe is brought into contact with the inner surface of the bellows shaft portion. In this assembly, it is desirable that the rear end of the small-diameter pipe is positioned at the center of the inner surface of the bellows shaft portion so that a good knocking operation can be obtained when used.
[0006]
[Problems to be solved by the invention]
However, in the conventional liquid applicator, when the small-diameter pipe is inclined in the shaft tube during assembly, it is difficult to position the rear end of the thin-diameter pipe at the center of the inner surface of the bellows shaft portion. Even if the rear end is positioned at the center of the inner surface of the bellows shaft portion, the rear end of the small-diameter pipe may be displaced from the inner surface of the bellows shaft portion during the knocking operation.
[0007]
The present invention has been made in view of the above-described conventional problems, and at the time of assembly, the rear end of the connecting member is easily positioned at the center of the knock portion, and the rear end of the connecting member is securely attached to the knock portion. An object of the present invention is to provide a tail end knock structure for a liquid applicator such as a writing instrument or a cosmetic tool to be held.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
That is, the present invention includes a barrel for storing the coating solution therein, e Bei knock portion provided on the tail end of the shaft tube, and a coupling member for interlocking to the knock part, the axial direction the knock part by knock, the connecting member opens the valve provided therein through it which was so as to discharge the coating liquid from the nib, the knock part, closing the tail and during knocking operation an elastic body that recoverable deformation, the inner peripheral surface of the tail end, the projection portion that is bent toward the collision out portion toward the inner circumferential surface inwardly in the axial direction at least at one side all It is integrally molded of a synthetic resin material over the circumference, the elastic body, so that its outer peripheral edge to grip the protruding portions in close contact, is molded of elastic material, substantially central position of the elastic member to, the recess open to other party that mates with the rear end portion of the connecting member is formed The front of the recess, the writing instrument slopes to induce rear end of the connecting member when the connecting member to the shaft within the cylinder during assembly is inserted from the other party in a central position of the recess is formed, the decorative member A tail-end knock structure of a liquid applicator or the like, wherein the protrusion formed on the inner peripheral surface of the tail end is formed with an annular slope, and the elastic body is formed after the protrusion is formed, A tail end knock of a liquid applicator, such as a writing instrument or a cosmetic, characterized in that the slope formed in the front part of the recess is flush with the annular slope of the protrusion and is a continuous slope. Structure.
[0009]
According to the present invention, when the connecting member is inserted into the shaft cylinder from the front during assembly, even if the connecting member is inclined with respect to the center line of the shaft cylinder in the shaft cylinder, the connecting member is It is guided to the concave portion by the inclined surface formed on the surface. Therefore, the rear end of the connecting member can be easily positioned at the center of the knock portion during assembly. Further, since the rear end portion of the connecting member is fitted into the recess, the connecting member is securely held by the knock portion even during the knocking operation.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The figure shows a writing instrument according to an embodiment of the present invention.
As shown in FIG. 1, the writing instrument of the first embodiment is a writing instrument that includes a shaft cylinder 1 that stores ink (an example of a coating liquid) therein, and the knock portion 27 provided at the tail end is axially arranged. By knocking, the valve provided inside is opened to allow the coating liquid to flow out from the pen tip.
[0011]
The writing instrument includes the shaft tube 1, the knock portion 27 that is pressed forward when knocked to reduce the writing tool internal volume, and the small-diameter pipe 7 that has a rear end connected to the knock portion 27 and extends forward in the shaft tube 1. And a valve rod 6 having a large-diameter portion 6a that is connected to the front end portion of the small-diameter pipe 7 and protrudes in the axial radial direction, and is fixed to the front-end opening of the shaft tube 1 and rearward of the large-diameter portion 6a. The valve seat 6 is slidably held at the position, and the valve seat 2 is in contact with the large-diameter portion 6a when not knocked and separated when knocked. Further, the writing instrument is fitted into the front end portion of the valve seat 2 so as to support the front end of the valve spring 8 and the valve spring 8 that urges the valve rod 6 rearward with the rear end contacting the large diameter portion 6a. At the same time, a spring receiver 3 having a guide hole 3c for guiding the front end portion of the valve stem 6 is disposed in front of the guide hole 3c, and at the time of knocking, a clearance between the large diameter portion 6a and the valve seat 2 and a guide hole 3c And a pen core 10 through which ink is supplied from within the shaft cylinder 1 through a gap with the valve stem 6.
[0012]
The configuration of each part will be described in detail. As shown in FIG. 1, the shaft tube 1 is made of synthetic resin and is open at both front and rear ends. The space behind the valve seat 2 in the shaft cylinder 1 is used as an ink tank 4, and an ink agitation ball 5 is slidably inserted therein.
[0013]
The valve stem 6 has a large-diameter portion 6a at a substantially central portion in the front-rear direction, and has a step portion 6b facing forward at the front end of the large-diameter portion 6a. The rear end of the large-diameter portion 6a is a step portion 6c that has a tapered diameter, and a small-diameter portion 6d is extended behind the step portion 6c. 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 penetrates the rear end surface of the valve seat 2 and protrudes backward, and the connecting small diameter portion 6e at the rear end is press-fitted into the front end port of the small diameter pipe 7 and connected.
[0014]
The valve seat 2 includes a flange portion 2a formed at the front end, a large diameter cylindrical portion 2b located in the mouth portion of the shaft cylinder 1, and a small diameter cylinder protruding into the ink tank 4 from the rear end of the large diameter cylindrical portion 2b. The portion 2c, a holding hole 2d formed on the rear wall of the small diameter cylindrical portion 2c and slidably holding the small diameter portion 6d of the valve stem 6, and the large diameter cylindrical portion 2b and the small diameter cylindrical portion 2c communicate with each other. A valve hole 2e and an opening 2f provided on the side wall of the small diameter cylindrical portion 2c are provided.
[0015]
A step portion 6c of the valve stem 6 can be brought into contact with and separated from the opening edge of the front end of the valve hole 2e, and communication between the ink tank 4 and the large-diameter cylindrical portion 2b is blocked when not knocked. When knocking, the valve stem 6 moves forward, and the ink tank 4 communicates with the inside of the large diameter cylindrical portion 2b through the opening 2f.
[0016]
The valve spring 8 is fitted in substantially half of the front side of the valve stem 6 and the front end of the valve spring 8 abuts against the stepped portion 6b of the large-diameter portion 6a, thereby constantly biasing the valve stem 6 rearward.
[0017]
The spring receiver 3 includes a flange portion 3a that is in contact with the flange portion 2a of the valve seat 2, the guide hole 3c formed at the center of the flange portion 3a, and a front portion of the large-diameter cylindrical portion 2b of the valve seat 2. And a fitting portion 3b to be fitted into 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 that are in sliding contact with the valve rod 6 on the inner surface of the circular hole.
[0018]
A front shaft 9 is fixed to the inner peripheral surface of the mouth portion of the shaft cylinder 1, and a spacer is provided between the inner peripheral surface of the front shaft 9 and the outer peripheral surface of the large-diameter cylindrical portion 2 b of the valve seat 2. 41 is interposed. The front end surface of the spacer 41 and the front shaft 9 sandwich the flanges 2 a and 3 a of the valve seat 2 and the spring receiver 3 in the front shaft 9. The center hole of the front shaft 9 is formed with a rib 9a protruding radially from the required position (position at every 120 ° in the circumferential direction) of the inner surface toward the center.
[0019]
The pen core 10 is gripped by the rib 9a of the front shaft 9, and is composed of felt, sliver, writing brush, and the like. The rear end surface of the pen core 10 faces the guide hole 3 c of the spring receiver 3. An intermediate diameter portion 9b is formed at a substantially central position in the axial direction of the tip shaft 9, and a sponge body 11 is attached to an inner hole portion of the intermediate diameter portion 9b. Then, 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 shaft tube 1.
[0020]
(Configuration of knock unit 27)
As shown in FIG. 1, the knock portion 27 is provided at the tail end portion of the shaft tube 1. The knock portion 27 closes the tail end of the shaft tube 1 and is elastically deformed so as to be restored during the knocking operation. The knock portion 27 is connected to the rear surface of the elastic body 28 and is connected to the rear surface of the elastic body 28 and behind the elastic body 28. And a knock cap 24 slidable back and forth.
[0021]
The shaft cylinder 1 is a synthetic resin molded product that is integrally formed by injection molding with a cover portion 15 provided at the rear portion to prevent malfunction of the knock portion 27. The peripheral wall of the cover portion 15 is provided with a notch 17 that is open rearward and into which a finger can be inserted. The user can perform the knocking operation while avoiding the cover portion 15 while letting his finger escape to the notch 17.
[0022]
On the inner peripheral surface of the shaft cylinder 1, there is a protrusion 1 b that protrudes inward from the inner peripheral surface and is bent from the protruding portion to the rear side (tail end side) in the axial direction over the entire periphery. It is integrally molded. The projecting portion 1b has a substantially L-shaped cross section, and an annular inclined surface 48 inclined rearward from the inner peripheral surface of the shaft tube 1 is formed on the front end surface thereof. In addition, the inner peripheral surface ahead of the protruding portion 1b of the shaft tube 1 has a shape that allows the mold core forming the inner peripheral surface to be released to the front. That is, the inner peripheral surface ahead of the protruding portion 1b of the shaft tube 1 is configured with substantially the same inner diameter dimension, and is a cylindrical surface without a stepped portion. As for the fixing means for the tip shaft 9 and the shaft cylinder 1, fixing means for press-fitting the outer peripheral surface of the tip shaft 9 into the inner peripheral surface of the shaft cylinder 1, the outer peripheral surface of the tip shaft 9 and the inner periphery of the shaft cylinder 1 Fixing means for ultrasonically welding the surfaces, fixing means for forming a male screw on the outer peripheral surface of the tip shaft 9 and forming a female screw on the inner peripheral surface of the shaft tube 1, and the inner periphery of the tip shaft 9 A fixing means for forming a female screw on the surface and forming a male screw on the outer peripheral surface of the shaft tube 1 and screwing them together can be appropriately selected.
[0023]
The elastic body 28 is formed of an elastic material after the protrusion 1b is formed such that the outer peripheral edge 31B grips the protrusion 1b in a close contact state. The elastic body 28 includes a concave portion 49 that is formed at a substantially central position and fits with the rear end portion of the small-diameter pipe 7. The recessed part 49 is a bag-shaped thing with a substantially circular cross section opened to the front. A slope 50 is formed at the front of the recess 49 to guide the rear end of the narrow pipe 7 to the center of the recess 49 when the thin pipe 7 is inserted into the shaft cylinder 1 from the front during assembly. ing. As shown in FIG. 2, the slope 50 has a front slope 50a formed flush with the annular slope 48 of the protrusion 1b, and is formed on the rear side of the front slope 50a and is more axial than the front slope 50a. The rear slope 50b has an inclination angle close to the direction. The elastic body 28 configured as described above is formed into a different type with an elastic material in the shaft tube 1 after the shaft tube 1 is formed by a two-color molding machine. The elastic body 28 is made of a rubber material such as an elastomer.
[0024]
As shown in FIG. 1, the knock cap 24 is a tapered molded product having a slightly reduced diameter toward the rear, and includes a cylindrical rib 24 a on the inner side. The knock cap 24 is held in the shaft cylinder 1 by a protrusion 25 projecting from the inner peripheral surface of the cover portion 15 while a rib 24a thereof is fitted to the outside of the concave portion 49 of the elastic body 28.
[0025]
The writing instrument is assembled as follows. First, the valve rod 6, the valve spring 8, the valve seat 2, the spring receiver 3, the sponge body 11, and the spacer 41 are assembled in the front shaft 9 and the small-diameter pipe 7 is connected to the valve rod 6. In this state, the small-diameter pipe 7 is inserted into the shaft tube 1 from the tip of the shaft tube 1 and is fitted into the concave portion 49 of the elastic body 28, and then the tip shaft 9 is fixed to the shaft tube 1 by an appropriate fixing means. To do.
[0026]
According to the first embodiment having the above-described configuration, the small diameter pipe 7 is pushed forward by knocking the knock cap 24 of the knock portion 27 in the axial direction to deform the elastic body 28. By the advance of the small diameter pipe 7, the valve rod 6 advances 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. By the advancement of the valve stem 6, the step 6c of the valve stem 6 is detached from the front end opening edge of the valve hole 2e of the valve seat 2. Due to the opening of the valve and the decrease in the internal volume of the ink tank 4 due to the deformation of the elastic body 28, the ink in the ink tank 4 enters 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 3 c of the spring receiver 3 and the front end of the valve stem 6.
[0027]
When the thin pipe 7 is inserted into the shaft cylinder 1 from the front during assembly, even if the thin pipe 7 is inclined with respect to the center line of the shaft cylinder 1 in the shaft cylinder 1 as shown in FIG. The small-diameter pipe 7 is guided to the center position of the recess 49 by the slope 48 of the protrusion 1b and the front slope 50a or the rear slope 50b of the elastic body 28. Therefore, the rear end of the small-diameter pipe 7 can be easily positioned at the center of the knock portion 27 during assembly. Further, since the rear end portion of the small-diameter pipe 7 is fitted into the concave portion 49, the small-diameter pipe 7 can be reliably held by the knock portion 27 even during the knocking operation.
[0028]
Next, the writing instrument of 2nd Embodiment is demonstrated. As shown in FIG. 3, the second embodiment includes a front tail end shaft 51 and a rear tail end shaft 52 that are separate from the shaft cylinder 1.
[0029]
As shown in FIG. 4, the front tail shaft 51 is provided with a flange portion 51 a on the outer periphery thereof, and is press-fitted or screwed into the tail end portion of the shaft tube 1 until the flange portion 51 a comes into contact with the tail end of the shaft tube 1. Inserted by etc. At the rear end portion of the inner peripheral surface of the front tail shaft 51, there is a protruding portion 51b that protrudes inward from the inner peripheral surface and is bent toward the front side in the axial direction from the protruding portion. Thus, it is integrally formed of a synthetic resin material. The elastic body 28 is formed of an elastic material after the protrusion 51b is formed so that the outer peripheral edge 31A grips the protrusion 51b in a close contact state. A concave portion 49 is formed at a substantially central position of the elastic body 28 so as to be engaged with the rear end portion of the small-diameter pipe 7 and is opened to the front portion of the concave portion 49. A slope 50 is formed that guides the rear end portion of the small-diameter pipe 7 to the center position of the recess 49 when the radial pipe 7 is inserted from the front. In addition, a substantially circular truncated conical projection 53 for fitting into the rear end opening of the small-diameter pipe 7 is integrally formed at the bottom of the recess 49.
[0030]
The slope 50 includes a front slope 50a and a rear slope 50b as in the first embodiment. The inner peripheral surface of the front tail end shaft 51 is provided with a slope 54 formed substantially flush with the front slope 50a.
[0031]
The front tail shaft 51 and the elastic body 28 configured in this way are formed by a two-color molding machine, and the elastic body 28 includes the front tail shaft 51 after the front tail shaft 51 is molded. Molded on the circumference. In addition, in this 2nd Embodiment, since there is no projection part in the internal peripheral surface of the axial cylinder 1, the core which forms the internal peripheral surface of the axial cylinder 1 can be mold-released to the axial direction tail end side. Therefore, as shown in FIG. 3, the base portion 1a of the shaft tube 1 can be formed with a small diameter, and the front shaft 9 can be fixed to the outer peripheral surface of the base portion 1a. In this case, the spacer 41 used in the first embodiment is not necessary.
[0032]
The rear tail end shaft 52 is integrally provided with the cover portion 15 and the notch 17 and is fitted to the rear portion of the front tail end shaft 51 so as to be connected to the tail end of the barrel 1. The collar part 51a is clamped. Although there is no restriction | limiting in particular about fixation of the front tail end axis | shaft 51 and the rear side tail end axis | shaft 52, For example, as shown in FIG. This is done by fitting a fitting projection 52a provided on the inner periphery of the front portion of the end shaft 52. The knock cap 24 is held in the rear tail end shaft 52 by a step portion 52 b formed on the inner peripheral surface of the rear tail end shaft 52.
[0033]
According to the second embodiment having the above-described configuration, the same effect as that of the first embodiment can be obtained, and at the same time, the pipe holding projection 53 of the recess 49 can more reliably secure the small-diameter pipe 7 to the knock portion. 27 central positions. Further, as described above, since the knock portion 27 is provided on the front tail end shaft 51 which is separate from the shaft cylinder 1, the spacer 41 used in the first embodiment can be deleted, and thus the component in the pen tip It is also possible to reduce the number of points.
[0034]
The first embodiment and the second embodiment are preferred embodiments of the present invention, and the technical scope of the present invention is not limited to these embodiments. For example, the tail end knock structure of the present invention can be widely applied to other liquid applicators such as a writing instrument having a brush 10A held inside a front shaft 9 via a holder 55 as shown in FIG. is there. In the modification shown in FIG. 5, the valve seat 2 has a form in which the small-diameter cylindrical portion 2c is deleted. In FIG. 5, the reference numeral 5A indicates a cylindrical stirring rod, and the reference numeral 56 indicates a cap.
[0035]
Further, the protrusion according to the present invention is not limited to a substantially L-shaped cross section, and may have a substantially T-shaped cross section that protrudes inward from the inner peripheral surface of the shaft tube and then bends in both axial directions. Good.
[0036]
【The invention's effect】
As described above, according to the present invention, in the tail end knock structure of a liquid applicator such as a writing instrument and a cosmetic tool, the rear end of the connecting member can be easily positioned at the center of the knock portion during assembly, The rear end portion of the connecting member can be reliably held by the knock portion.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a writing instrument according to a first embodiment.
FIG. 2 is a longitudinal sectional view of a shaft cylinder and an elastic body according to the first embodiment.
FIG. 3 is a longitudinal sectional view of a writing instrument according to a second embodiment.
FIG. 4 is a longitudinal sectional view of a shaft cylinder, a front tail end shaft, a rear tail end shaft, and an elastic body according to a second embodiment.
FIG. 5 is a longitudinal sectional view of a writing instrument according to a modification of the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1b Protrusion part 2 Valve seat 3 Spring receiver 6 Valve rod 6a Large diameter part 7 Small diameter pipe (equivalent to a connection member)
8 Valve spring 10 Pen core 10A Brush 24 Knock cap 27 Knock part 28 Elastic body 31A Outer peripheral part 31B Outer peripheral part 49 Recess 50 Slope 50a Front slope 50b Rear slope 51 Front tail shaft 51b Protrusion 52 Rear tail shaft

Claims (1)

A barrel for storing the coating solution therein, a knock portion disposed on the tail end of the shaft tube, e Bei and a connecting member for interlocking to the knock part, by knocking the knock part in the axial direction, The valve provided inside is opened through the connecting member to allow the coating liquid to flow out from the pen tip , and the knock portion is an elastic material that closes the tail end and deforms so that it can be restored during the knock operation. has a body, an inner peripheral surface of the tail end, the projection portion that is bent toward the collision out portion toward the inner circumferential surface inwardly in the axial direction at least one side over the whole circumference synthesis are integrally molded with resin material, the elastic body is molded in the elastic material so that its outer peripheral edge to grip the protruding portions in close contact, in a substantially central position of said elastic member, after said coupling member with recesses open to other party that mates with the end portion is formed, the front of the recess, set The writing instrument coupling member slopes to induce rear end of the connecting member when it is inserted from the other party in a central position of the concave portion is formed, the tail of the liquid applicator, such as a cosmetic tool in the shaft within the cylinder when Te An end knock structure,
An annular slope is formed on the protrusion formed on the inner peripheral surface of the tail end,
The elastic body is characterized in that, after forming the projection, the slope formed at the front part of the recess is formed to be flush with and continuous with the annular slope of the projection. Tail-end knock structure for liquid applicators such as writing instruments and cosmetics.

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