JP4806134B2 - Screwing structure of writing instruments - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screwing structure of a writing instrument. 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 The side where the cylindrical part of the member is inserted is indicated, and “front” indicates the opposite side.
[0002]
[Prior art]
Conventionally, in the screwing structure of the container main body and the cap, when the screwing of both the container main body and the cap is finished, the male screw is used for the purpose of suppressing the rotation in the screw loosening direction and preventing the rotation in the screw tightening direction. There is known a configuration in which a crossover locking portion and a rotation blocking portion are provided at the base portion of the cylinder portion having a back (position behind the male screw). (For example, Japanese Utility Model Publication No. 63-33817)
[0003]
[Problems to be solved by the invention]
In the conventional screwing structure, in order to provide a rotation preventing portion having sufficient strength, a member having a female screw (corresponding to the second member of the present application) has an outer diameter of a member having a male screw (this application This is very large compared to the outer diameter of the cylindrical portion (corresponding to the first member), and the degree of freedom in design is small.
[0004]
Conversely, if 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 cannot be increased by design, the above-described conventional configuration has sufficient strength to prevent rotation. It becomes difficult to provide a part. In particular, when the screw tightening is performed with a strong force by an automatic machine or the like, the rotation prevention portion (for example, the regulation wall or the locking wall) may be damaged, and the rotation of the screw cannot be prevented at an appropriate position.
[0005]
The present invention solves the above-mentioned conventional problems, and is intended to provide a screwing structure for a writing instrument that can be provided with a rotation preventing portion having sufficient strength without being restricted by design. is there.
[0006]
[Means for Solving the Problems]
[1] In the present invention, the cylindrical portion 3 is provided at the front end portion of the first member 1, the male screw 31 is provided on the outer peripheral surface of the cylindrical portion 3, and the male screw 31 is provided on the inner peripheral surface of the second member 5. A writing screw screwing structure in which the first member 1 and the second member 5 are detachably screwed to each other. A restriction wall 32 is provided on the front end surface of the cylindrical portion 3, a locking wall 62 is provided on the inner surface of the second member 5, and a protrusion 33 is provided on the outer surface of the first member 1, and the second member When the first member 1 and the second member 5 are screwed together, the regulating wall 32 and the locking wall 62 come into contact with each other, and the screw tightening direction is provided. At the same time the rotation of is prevented, the shut engagement with the projection 33 and the protrusion 63 gets over, is inhibited rotation of the screw loosening direction, the restriction wall 32, the Having a shape formed by cutting a part of the front end surface of the cylindrical portion 3 in the radial direction is (claim 1) the requirement [0007]
(Function)
By providing the restriction wall 32 that prevents rotation in the screw tightening direction on the front end surface of the cylinder part 3 instead of the base part of the cylinder part 3, the restriction wall 32 having sufficient strength can be obtained freely. Accordingly, it is not necessary to set the outer diameter of the second member 5 so large as to the outer diameter of the cylindrical portion 3 of the first member 1 in order to provide the regulating wall 32 having sufficient strength. The degree of freedom increases in designing the external shapes of the member 1 and the second member 5.
[0008]
[0009]
(Function)
Since the restriction wall 32 has a shape in which a part of the front end surface of the cylindrical portion 3 is cut out in the radial direction, the radial thickness of the restriction wall 32 and the height in the axial direction of the restriction wall 32 are It can be ensured sufficiently, and the strength of the restriction wall 32 can be further improved.
[0010]
[ 2 ] In the screwing structure of the writing instrument according to claim 1 , it is preferable that the projection 33 and the protrusion 63 protrude in the radial direction (claim 2 ).
[0011]
(Function)
That is, since the protrusion 33 on the outer surface of the first member 1 protrudes radially outward and the convex portion 63 on the inner surface of the second member 5 protrudes radially inward, the first member 1, Due to the elastic deformation of the cylindrical side walls of both the second members 5, it is possible to obtain an appropriate feeling of getting over.
[0012]
[ 3 ] In the screwing structure of the writing instrument according to claim 2 , the projection 33 of the first member 1 can be provided behind the male screw 31, but the projection 33 of the first member 1 is male. It is preferable to provide in front of the screw 31 and provide the convex portion 63 of the second member 5 in front of the female screw 61 (Claim 3 ).
[0013]
(Function)
Thereby, the convex part 63 of the 2nd member 5 and the external thread 31 of the 1st member 1 do not contact, and the internal diameter of the convex part 63 of the 2nd member 5 is made into the external thread of the 1st member 1. It can be set freely without being restricted by the 31 peak diameter, and an appropriate feeling of getting over between the projection 33 and the projection 63 can be obtained.
[0014]
[ 4 ] In the screwing structure of the writing instrument according to claim 3 , the outer diameter of the protrusion 33 of the first member 1 is made smaller than the mountain diameter of the female screw 61 of the second member 5 (claim 4 ). Is preferred. 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.
[0015]
(Function)
Thereby, the protrusion 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. That is, the first member 1 and the second member 5 are not provided with the locking portions (that is, the protrusions 33 and the protrusions 63) and the rotation prevention portions (that is, the restriction walls 32 and the locking walls 62). The appearance can be designed freely.
[0016]
[ 5 ] In the screwing structure of the writing instrument according to any one of claims 1 to 4 , the first member 1 and the second member 5 are screwed on the outer peripheral surface of the first member 1 and the outer peripheral surface of the second member 5. It is preferable to form a series of deformed portions 4 and 7 when the combination is completed (Claim 5 ).
[0017]
(Function)
Since positioning in the rotational direction is performed by the contact between the restriction wall 32 and the locking wall 62, when the first member 1 and the second member 5 are screwed together, the outer shape of the first member 1 is deformed. The part 4 and the deformed part 7 on the outer surface of the second member 5 can always be viewed as a series of deformed parts, whereby the aesthetic appearance of the first member 1 and the second member 5 is maintained. The deformed portion includes, for example, continuous convex portions (ridges, ribs) or concave portions (grooves), continuous dot-shaped convex portions or concave portions, continuous figures, patterns, characters, and the like made of printing. It is done.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0019]
One embodiment of the present invention is shown in FIGS. In this embodiment, the first member 1 is a large cap that is detachably attached to the pen tip side of the writing instrument, and the second member 5 is a small cap that is detachably screwed to the front end of the large cap. It is a cap.
[0020]
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 body 2, a cylindrical portion 3 having an outer diameter slightly smaller than the main body 2 projecting from the front end portion of the cylindrical body 2, and an outer peripheral surface of the front end portion of the main body 2 behind the cylindrical portion 3. It consists of a clip 4 projecting integrally.
[0021]
A male screw 31 is formed on the outer peripheral surface of the cylindrical portion 3. Then, two protrusions 33 protruding radially outward are formed on the outer peripheral surface of the cylindrical portion 3 in front of the male screw 31 at a position symmetrical with respect to the axis. In addition, a restriction wall 32 is suspended from the front end surface of the cylindrical portion 3. The restriction wall 32 is formed by a notch in which a part of the front end surface of the cylindrical portion 3 is provided in the radial direction. By the cutout, an inclined relief surface 32 a connected to the restriction wall 32 is formed on the front end surface of the cylindrical portion 3.
[0022]
A cylindrical eraser 11 is inserted into the inner surface of the cylindrical portion 3, and the front end portion of the eraser 11 projects forward from the front end surface of the cylindrical portion 3. Further, a step portion 12 is formed between the cylindrical portion 3 and the main body 2.
[0023]
The clip 4 includes a plate-like portion 41 and a base portion 42 having a T-shaped cross section, and the front end surface of the base portion 42 and the stepped portion 12 are in the same plane.
[0024]
The small cap (second member 5) is an injection-molded body of synthetic resin (for example, polycarbonate, polypropylene, polyethylene terephthalate, ABS resin, etc.), and has a cylindrical main body with the front end closed and the rear end opened. 6 and a rib 7 having a T-shaped cross section projecting integrally 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 coplanar.
[0025]
On the inner peripheral surface of the main body 6 of the small cap, a female screw 61 that 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 that can come into contact with the restriction wall 32 is suspended. Further, on the inner peripheral surface of the main body 6 in front of the female screw 61, there are two convex portions 63 protruding inward in the radial direction and capable of getting over and engaging with the protrusions 33 of the first member 1. It is formed at a symmetrical position. In addition, the crest diameter of the female screw 61 is set larger than the outer diameter of the protrusion 33 of the first member 1.
[0026]
(Function)
The second member 5 is placed 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 61 of the second member 5 are screwed together. However, the 1st member 1 and the 2nd member 5 are rotated relatively.
[0027]
The protrusion 33 on the outer surface of the first member 1 and the convex portion 63 on the inner surface of the second member 5 get over and lock, and at the same time, the relationship between the restriction wall 32 of the first member 1 and the second member 5. The stop wall 62 contacts and the screwing is finished. Rotation in the screw loosening direction is suppressed by the overhanging engagement between the protrusion 33 and the convex portion 63, and rotation in the screw tightening direction is prevented by contact between the restriction wall 32 and the locking wall 62.
[0028]
In the present embodiment, when the first member 1 and the second member 5 are screwed together, the front end of the stepped portion 12 of the main body 2 of the first member 1 and the clip 4 base portion 42 of the first member 1. The plane formed by the surface and the 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 abut or approach each other. Furthermore, in this embodiment, the rear end surface of the rib 7 having the T- shaped cross section and the front end surface of the base portion 42 of the clip 4 having the T- shaped cross section have substantially the same shape. Reference), the clip 4 and the rib 7 become a series, and the aesthetic appearance is improved.
[0029]
【The invention's effect】
According to the first aspect of the present invention, it is possible to provide a rotation preventing portion having sufficient strength without being restricted by design.
[0030]
According to the first aspect of the present invention, the thickness in the radial direction of the regulating wall and the height in the axial direction of the regulating wall can be sufficiently secured, and the strength of the regulating wall can be further improved.
[0031]
According to the second aspect of the present invention, an appropriate feeling of getting over can be obtained by elastic deformation of the cylindrical side walls of both the first member and the second member.
[0032]
According to the invention of claim 3 , the inner diameter of the convex portion of the second member can be freely set without being restricted by the thread diameter of the male screw of the first member, and a moderate feeling of getting over between the protrusion and the convex portion can be obtained. Obtainable.
[0033]
According to the invention of claim 4 , during the screwing, the projection of the first member does not come into contact with the female screw of the second member, and a smooth screwing feeling can be obtained.
[0034]
According to the invention of claim 5 , the aesthetic appearance of the first member and the second member is maintained.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of the present invention.
2A is a view taken along the line AA in FIG. 1, and FIG. 2B is a view taken along the line BB in FIG.
FIG. 3 is a perspective view of a main part of the first member in FIG. 1;
4 is a cross-sectional perspective view of the second member of FIG. 1. FIG.
5 is a front view showing a screwing end state of FIG. 1; FIG.
[Explanation of symbols]
1 First member (large cap)
DESCRIPTION OF SYMBOLS 11 Eraser 12 Step part 2 Main body 3 Cylindrical part 31 Male screw 32 Restriction wall 32a Relief surface 33 Protrusion 4 Clip 41 Plate-like part 42 Base part 5 Second member (small cap)
6 Main body 61 Female screw 62 Locking wall 63 Convex part 7 Rib

Claims (5)

A cylindrical portion is provided at the front end of the first member, a male screw is provided on the outer peripheral surface of the cylindrical portion, a female screw that can be screwed with the male screw is provided on the inner peripheral surface of the second member, A writing instrument screwing structure in which the member and the second member are detachably screwed, and a restriction wall is provided on the front end surface of the cylindrical portion of the first member, A locking wall is provided on the inner surface, a protrusion is provided on the outer surface of the first member, a convex portion is provided on the inner surface of the second member, and the first member and the second member are screwed together. When the operation is finished, the restriction wall and the locking wall come into contact with each other, and the rotation in the screw tightening direction is prevented, and at the same time, the protrusion and the convex portion get over and lock, and the rotation in the screw loosening direction is suppressed. And the restricting wall has a shape in which a part of a front end surface of the cylindrical portion is cut out in a radial direction . The screwing structure for a writing instrument according to claim 1, wherein the protrusion and the protrusion protrude in the radial direction . The screwing structure for a writing instrument according to claim 2, wherein the protrusion is provided in front of the male screw, and the protrusion is provided in front of the female screw . The screwing structure of the writing instrument according to claim 3, wherein an outer diameter of the protrusion is smaller than a mountain diameter of the female screw . 5. A deformed portion that forms a series when the first member and the second member are screwed to each other on the outer peripheral surface of the first member and the outer peripheral surface of the second member. The screwing structure of the writing instrument according to any one of the above.

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