JP2002362082A - Screwing structure for writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation inhibiting section having a sufficient strength without restricting in a design. SOLUTION: A screwing structure for a writing instrument comprises a first member 1 having a cylindrical part 3 provided at a front end, and male threads 31 provided on an outer peripheral surface of the cylindrical part 3. The screwing structure further comprises female threads 61 capable of being screwed on the threads 31 and provided on an inner peripheral surface of a second member 5. The screwing structure also comprises a specific wall provided on a front end face of the part 3 of the member 1, and a locking wall provided on an inner surface of the member 5. The screwing structure also comprises a protrusion 33 provided on an outer surface of the member 1, and a protruding part 63 provided on an inner surface of the member 5. When the member 1 is engaged with the member 5, the specific wall is contacted with the locking wall, a rotation of the screwing direction is prevented, and simultaneously the protrusion 33 overrides the protruding part 63 to be locked, and hence the rotation of the loosening direction is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument screwing structure. In the first member of the present invention, “front” refers to the cylindrical portion side, “rear” refers to the opposite side, and in the second member of the present invention, “rear” refers to the first member. Refers to the side where the cylindrical portion of the member is inserted, and “front” refers to the opposite side.

[0002]

2. Description of the Related Art Conventionally, in a screwed structure of a container body and a cap, when screwing of both members of the container body and the cap is completed, rotation in the screw loosening direction is suppressed and rotation in the screw tightening direction is prevented. For the purpose, there is known a configuration in which a climbing stop portion and a rotation preventing portion are provided at a base portion (a rear position of the male screw) of a cylindrical portion having a male screw. (For example, Jikken 63-33
No. 817, etc.)

[0003]

In the conventional screwing structure, in order to provide a rotation preventing portion having sufficient strength, the outer diameter of a member provided with a female screw (corresponding to the second member of the present application) is required. ,
The outer diameter of the cylindrical portion of the member having an external thread (corresponding to the first member of the present application) is extremely large, and the degree of freedom in design is small.

On the contrary, the difference between the outer diameter of the cylindrical portion having the male screw and the outer diameter of the member having the female screw is determined by design.
If it is not possible to make it large, in the conventional configuration,
It becomes difficult to provide a rotation preventing portion having sufficient strength. In particular, when the screw is tightened with a strong force by an automatic machine or the like, the rotation preventing portion (for example, the regulating wall or the locking wall) may be damaged, and the screw may not be prevented from rotating at an appropriate position.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a screwing structure of a writing instrument capable of providing a rotation preventing portion having a sufficient strength without being restricted by design. Is what you do.

[0006]

Means for Solving the Problems [1] According to the present invention, a cylindrical member 3 is provided at a front end of a first member 1, a male screw 31 is provided on an outer peripheral surface of the cylindrical member 3, and a second member 5 is provided. A female screw 61 capable of being screwed with the male screw 31 is provided on the inner peripheral surface of the writing member, and the first member 1 and the second member 5 are detachably screwed to each other. And the cylindrical portion 3 of the first member 1
A regulating wall 32 is provided on a front end surface of the second member 5, a locking wall 62 is provided on an inner surface of the second member 5, and a projection 33 is provided on an outer surface of the first member 1. Convex part 63
When the screwing of the first member 1 and the second member 5 is completed, the regulating wall 32 and the locking wall 62 come into contact with each other, and rotation in the screw tightening direction is prevented. At the same time, the protrusion 33 and the convex portion 63 must ride over and be locked, so that rotation in the screw loosening direction is suppressed (claim 1).

(Operation) The regulating wall 3 for preventing rotation in the screw tightening direction is provided not on the base of the cylindrical portion 3 but on the front end face of the cylindrical portion 3.
2, the regulating wall 32 having sufficient strength
Can be obtained freely. Accordingly, it is not necessary to set the outer diameter of the second member 5 to be much larger than the outer diameter of the cylindrical portion 3 of the first member 1 in order to provide the regulating wall 32 having sufficient strength. In designing the external shapes of the member 1 and the second member 5, the degree of freedom is increased.

[2] In the screwing structure of the writing instrument according to the first aspect, the regulating wall 32 has a shape in which a part of a front end face of the cylindrical portion 3 is cut off in a radial direction (a second aspect).
Is preferred.

(Operation) As a result, the thickness of the regulating wall 32 in the radial direction and the height of the regulating wall 32 in the axial direction can be sufficiently ensured, and the strength of the regulating wall 32 can be further improved.

[3] In the screwing structure of the writing instrument according to claim 1 or 2, it is preferable that the projection 33 and the projection 63 project radially (claim 3).

(Operation) In other words, the projections 33 on the outer surface of the first member 1 project radially outward, and the projections 63 on the inner surface of the second member 5 project radially inward. Due to the elastic deformation of the cylindrical side walls of both the first member 1 and the second member 5,
A moderate feeling of overcoming can be obtained.

[4] In the screwing structure of the writing instrument according to the third aspect, the projection 33 of the first member 1 can be provided behind the male screw 31, but the projection of the first member 1 can be provided. Preferably, 33 is provided ahead of the male screw 31, and the projection 63 of the second member 5 is provided ahead of the female screw 61 (claim 4).

(Operation) As a result, the protrusion 63 of the second member 5 does not come into contact with the male screw 31 of the first member 1, and the inner diameter of the protrusion 63 of the second member 5 is reduced to the first value. Member 1
Can be set freely, without being restricted by the thread diameter of the male screw 31.
An appropriate feeling of getting over the projection 33 and the projection 63 can be obtained.

[5] In the screwing structure of the writing instrument of the fourth aspect, the outer diameter of the projection 33 of the first member 1 is made smaller than the diameter of the female screw 61 of the second member 5 (claim). Item 5) is preferred. Note that the outer diameter of the protrusion 33 is the maximum value of the diameter of a circumscribed circle that is in contact with the outer surface of the protrusion 33 around the axis of the cylindrical portion 3.

(Operation) As a result, the projection 33 of the first member 1 does not come into contact with the female screw 61 of the second member 5 during the screwing, and a smooth screwing feeling can be obtained. As a result, the difference between the outer diameter of the cylindrical portion 3 of the first member 1 and the outer diameter of the second member 5 is no different from the case where no loosening prevention portion or rotation prevention portion is provided. In other words, the first member 1 and the second member 5 are provided in the same manner as in the case where the loosening prevention portion (ie, the projection 33 and the projection 63) and the rotation prevention portion (ie, the regulation wall 32 and the locking wall 62) are not provided. Appearance design can be done freely.

[6] In the screwing structure of the writing instrument according to any one of claims 1 to 5, the outer peripheral surface of the first member 1 and the second member 5
It is preferable to form a series of deformed portions 4 and 7 on the outer peripheral surface of the first member 1 when screwing of the first member 1 and the second member 5 is completed (claim 6).

(Operation) Since the positioning in the rotational direction is performed by the contact between the regulating wall 32 and the locking wall 62, when the screwing of the first member 1 and the second member 5 is completed, the first member 1 Member 1
The profile 4 on the outer surface and the profile 7 on the outer surface of the second member 5 are always visible as a series of profiles, thereby maintaining the aesthetic appearance of the first member 1 and the second member 5. . still,
Examples of the deformed portion include a continuous convex portion (projection or rib) or a concave portion (groove), a continuous point-like convex portion or a concave portion, a continuous figure, pattern, or character formed by printing or the like.

[0018]

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

One embodiment of the present invention is shown in FIGS.
In the present embodiment, the first member 1 is a large cap detachably attached to the pen tip side of the writing instrument, and the second member 5 is a small cap detachably screwed to the front end of the large cap. Cap.

The large cap (first member 1) is obtained by injection molding of a synthetic resin (for example, polycarbonate, polypropylene, polyethylene terephthalate, ABS resin, etc.), and has a rear end opening that can be attached to the pen tip of a writing instrument. A cylindrical main body 2 having a portion, a cylindrical portion 3 having an outer diameter slightly smaller than the main body 2 protruding from a front end of the cylindrical main body 2, and a front end of the main body 2 behind the cylindrical portion 3 And a clip 4 integrally projecting from the outer peripheral surface.

A male screw 31 is formed on the outer peripheral surface of the cylindrical portion 3. Then, the cylindrical portion 3 in front of the male screw 31
Are provided with two projections 33 projecting radially outward.
Are formed at axially symmetric positions. Further, a regulating wall 32 is vertically provided on a front end surface of the cylindrical portion 3. The regulation wall 32
Is formed by a notch in which a part of the front end face of the cylindrical portion 3 is penetrated in the radial direction. Due to the notch, an inclined relief surface 3 connected to the regulating wall 32 is provided on the front end surface of the cylindrical portion 3.
2a is formed.

A cylindrical eraser 11 is inserted into the inner surface of the cylindrical portion 3, and the front end of the eraser 11 projects forward from the front end surface of the cylindrical portion 3. Further, the cylindrical portion 3
A step portion 12 is formed between the main body 2.

The clip 4 comprises a plate-shaped portion 41 and a base 42 having a T-shaped cross section. The front end face of the base 42 and the step 12 are coplanar.

The small cap (second member 5) is an injection-molded article of a synthetic resin (for example, polycarbonate, polypropylene, polyethylene terephthalate, ABS resin, etc.), and has a closed front end and an open rear end. A main body 6 having a T-shape and a rib 7 having a T-shaped cross section, which is integrally provided on the outer peripheral surface of the main body 6. The rear end surface of the main body 6 and the rear end surface of the rib 7 are flush with each other.

On the inner peripheral surface of the main body 6 of the small cap, a female screw 61 which can be screwed with the male screw 31 of the first member 1 is formed. On the inner peripheral surface of the main body 6 in front of the female screw 61, a locking wall 62 which can abut on the regulating wall 32 is vertically provided. Further, on the inner peripheral surface of the main body 6 in front of the female screw 61, two radially inwardly protruding projections 63 that can ride over and lock the projections 33 of the first member 1 are provided. It is formed at a symmetric position. The diameter of the female screw 61 is set larger than the outer diameter of the projection 33 of the first member 1.

(Operation) The second member 5 is put on the outer peripheral surface of the cylindrical portion 3 of the first member 1 having the eraser 11, and the male screw 31 of the first member 1 and the female screw of the second member 5 are provided. The first member 1 and the second member 5 are relatively rotated while screwing the first member 1 and the second member 5.

The projection 33 on the outer surface of the first member 1
And the protrusion 63 on the inner surface of the second member 5 gets over and is locked, and at the same time, the regulating wall 32 of the first member 1 and the second member 5
The stop wall 62 abuts, and the screwing is completed. The protrusion 33
The rotation of the screw in the loosening direction is suppressed by the overriding locking of the protrusion 63 and the convex portion 63, and the rotation in the screw tightening direction is prevented by the contact between the regulating wall 32 and the locking wall 62.

In this embodiment, when the screwing of the first member 1 and the second member 5 is completed, the step 12 of the main body 2 of the first member 1 and the base of the clip 4 of the first member 1 A plane formed by the front end surface of the second member 5 and a plane formed by the rear end surface of the main body 6 of the second member 5 and the rear end surface of the rib 7 of the second member 5 are in contact with or close to each other. Further, in this embodiment, the rear end face of the rib 7 having the T-shaped cross section and the base 4 of the clip 4 having the T-shaped cross section are provided.
2 has substantially the same shape as the front end surface, and at the end of the screwing (see FIG. 5), the clip 4 and the ribs 7 become a series, and the aesthetic appearance is improved.

[0029]

According to the first aspect of the present invention, it is possible to provide a rotation preventing portion having a sufficient strength without being restricted by design.

According to the second aspect of the invention, the thickness of the regulating wall in the radial direction and the height of the regulating wall in the axial direction can be sufficiently ensured, and the strength of the regulating wall can be further improved.

According to the third aspect of the present invention, a moderate feeling of overcoming can be obtained by the elastic deformation of the cylindrical side walls of both the first member and the second member.

According to the fourth aspect of the present invention, the inner diameter of the convex portion of the second member is not restricted by the thread diameter of the male screw of the first member.
It can be set freely, and an appropriate feeling of getting over the projection and the projection can be obtained.

According to the fifth aspect of the invention, the protrusion of the first member does not come into contact with the female screw of the second member during the screwing, and a smooth screwing feeling can be obtained.

According to the invention of claim 6, the aesthetic appearance of the first member and the second member is maintained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

FIG. 2 (a) is a view taken along line AA of FIG. 1, and FIG.
FIG. 5 is a view taken along line BB of FIG.

FIG. 3 is a perspective view of a main part of a first member of FIG. 1;

FIG. 4 is a sectional perspective view of a second member of FIG. 1;

FIG. 5 is a front view showing a screwed end state of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st member (large cap) 11 Eraser 12 Step 2 Main part 3 Cylindrical part 31 Male screw 32 Restriction wall 32a Relief surface 33 Projection 4 Clip 41 Plate part 42 Base 5 Second member (small cap) 6 Main body 61 Female screw 62 Locking wall 63 Convex part 7 Rib

Claims (6)

[Claims] A cylindrical member is provided at a front end of a first member, a male screw is provided on an outer peripheral surface of the cylindrical member, and a female screw which can be screwed with the male screw is provided on an inner peripheral surface of a second member. Provided, a screwing structure of a writing instrument formed by detachably screwing the first member and the second member, wherein a regulating wall is provided on a front end surface of a cylindrical portion of the first member, A locking wall is provided on the inner surface of the second member,
Further, a protrusion is provided on an outer surface of the first member, and a protrusion is provided on an inner surface of the second member. When the screwing of the first member and the second member is completed, the regulating wall is formed. And the locking wall abuts to prevent rotation in the screw tightening direction, and at the same time, the protrusion and the convex portion cross over and lock to prevent rotation in the screw loosening direction. Screw structure. 2. A screwing structure for a writing instrument according to claim 1, wherein said regulating wall has a shape in which a part of a front end face of said cylindrical portion is cut out in a radial direction. 3. The screwing structure for a writing instrument according to claim 1, wherein said projection and said projection project in the radial direction. 4. The screwing structure for a writing instrument according to claim 3, wherein said projection is provided in front of a male screw, and said projection is provided in front of a female screw. 5. A screwing structure for a writing instrument according to claim 4, wherein the outer diameter of said projection is smaller than the diameter of the female screw. 6. A series of deformed portions formed on the outer peripheral surface of the first member and the outer peripheral surface of the second member when the screwing of the first member and the second member is completed. A screwing structure for the writing instrument according to claim 1.