JP2009006584A - Connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which a user who holds the vicinity of the tip of the shaft cylinder of a writing tool in writing must perform writing with a sense of discomfort since he/she holds a tip member since the tip member is extended in the related art, whereas the tip member tends to be formed short in recent years since users who hold the vicinity of the tip of the shaft cylinder of the writing tool in writing are increasing. <P>SOLUTION: In the connecting structure having the tip member screwed to an end of the shaft cylinder, a male thread part is formed in the vicinity of the end of the shaft cylinder, and an imperfect thread part is formed in the front of the male thread part, the imperfect thread part including a protruding regulation part. On the other hand, a female tread part is formed on the inner surface of the tip member, and an imperfect thread part is formed in the front of the female thread part, the imperfect thread part including a projection part to be engaged with the regulation part and a regulated part to abut on the regulation part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection structure in which a tip member is screwed to an end portion of a shaft tube.

  As an example, a cylindrical portion is provided at the front end portion of the first member, a male screw is provided on the outer peripheral surface of the cylindrical portion, and 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 first member and the second member are detachably screwed, wherein a restriction wall is provided on a front end surface of the cylindrical portion of the first member, A locking wall is provided on the inner surface of the second member, 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 provided. When the screwing is finished, the restricting wall and the locking wall come into contact with each other, and the rotation in the screw tightening direction is prevented. There is known a screwing structure of a writing instrument in which the rotation of the writing tool is suppressed.

JP 2002-362208 A

However, in the above-described prior art, since the regulation wall 32 is formed on the end surface of the cylindrical portion 3, the distance from the male screw 31 to the end surface is increased, and therefore the length of the cylindrical portion 3 is also increased. It was getting longer. And if a cylindrical part became long, the tip member had to be lengthened.
By the way, in recent years, there are an increasing number of users who grasp and write near the tip end of the shaft of the writing instrument. Therefore, manufacturers of writing instruments tend to form the tip member short.
However, in the above prior art, since the tip member is long, for the user gripping the vicinity of the tip, the tip member is gripped. I had to write.

  The present invention is a connection structure in which a tip member is screwed to an end portion of a shaft tube, and a male screw portion is formed in the vicinity of the end portion of the shaft tube, and an incomplete screw portion is formed in front of the male screw portion. The incomplete threaded portion is provided with a projecting restricting portion. On the other hand, an internal thread portion is formed on the inner surface of the tip member, and an incomplete threaded portion is formed in front of the internal thread portion. The gist of the present invention is that the protrusion is provided with a protrusion that engages with the restriction portion and a restricted portion that contacts the restriction portion.

  The present invention is a connection structure in which a tip member is screwed to an end portion of a shaft tube, and a male screw portion is formed in the vicinity of the end portion of the shaft tube, and an incomplete screw portion is formed in front of the male screw portion. The incomplete threaded portion is provided with a projecting restricting portion. On the other hand, an internal thread portion is formed on the inner surface of the tip member, and an incomplete threaded portion is formed in front of the internal thread portion. Since the projecting portion that engages with the regulating portion and the regulated portion that comes into contact with the regulating portion are provided on the portion, the tip member can be formed short, which is good for users grasping the vicinity of the tip. Writing is obtained.

  The operation will be described. Restriction of screwing (rotation) between the shaft cylinder and the tip member is performed by the side surface portion of each member.

An example of the present invention will be described with reference to FIGS. In front of the colored translucent outer shaft 1 made of black, red, blue, or the like, a tip member 2 is detachably fixed by a screwing means. A protrusion 2 a is formed on the surface of the tip member 2 in the longitudinal direction, and the rear end of the protrusion 2 a extends to the front part of the outer shaft 1. Moreover, the recessed part 2b which forms a geometric pattern is formed in the circumferential direction on the surface except the vicinity of the protrusion 2a. Since the protrusion 2a indicates the direction of the pen tip 20a to be written, the recognition ability of the tip of the pen tip 20a is improved, and the concave portion 2b in the circumferential direction is the visibility of the writing surface. Has improved. An internal thread portion 2 c is formed on the inner surface of the tip member 2 and is screwed into the external thread portion 1 a of the outer shaft 1. Further, an incomplete screw portion 2d in which the female screw 2c is not formed is formed in front of the female screw 2c, and a triangular projection 2e having an arcuate top is formed on the surface of the incomplete screw portion 2d. A protruding restricting portion 2f is formed adjacent to the protruding portion 2e, and a flat portion 2h is formed in the direction of the protruding portion 2e of the restricting portion 2f.
Further, a through hole 2i in which the pen tip 20a appears and disappears is formed in front of the tip member 2, and a large diameter portion 2j and a small diameter portion 2k are formed from the front to the rear of the through hole 21. The former large-diameter portion 2j is formed in consideration of the penetration of the plating solution when the surface of the tip member 2 is plated. That is, the diameter of the plating solution is set to be large. The large diameter portion 2j is not formed only in the vicinity of the tip, but has a certain length toward the rear. On the other hand, the latter small-diameter portion 2k has substantially the same diameter as the pen tip 20a, but is formed to have a slightly larger diameter. This prevents the pen tip 20a from shaking.

The front portion of the outer shaft 1 is formed with a reduced diameter portion 3, and the reduced diameter portion 3 is formed with a grip portion 4 made of a rubber-like elastic body in two colors, multiple molding, or different material molding. It is integrally formed by a forming means called. A plurality of streamlined step portions 4a are formed on the surface of the grip member 4, and the rear end portion is inclined (inclined surface portion 4b) along the streamlined step portion. The aesthetic appearance is improved and the fit to the finger when gripping the grip member 4 is made favorable.
A flat portion 3a is formed behind the reduced diameter portion 3 so that the cross section of the reduced diameter portion 3 has a D-shape, and the flat portion 3a has a T-shaped protrusion protruding outward. Part 3b is formed. Moreover, although the through-hole 3c is formed in the said protrusion 3b, the through-hole 3c is formed in the state straddling the protrusion 3b and the reduced diameter part 3. FIG. And one part of the grip part 4 has sunk in the inside of these T-shaped protrusions 3b and the through holes 3c. That is, when the grip portion is molded, the resin as the material of the grip portion enters from both openings of the through hole 3c and is connected inside the through hole 3c. This improves the effect of preventing the peeling (turning) phenomenon from the end of the grip portion 4 with respect to the reduced diameter portion 3, the rotation phenomenon with respect to the shaft tube, and the swelling phenomenon of the grip portion 4.
In this example, the cross-sectional shape of the through hole 3c is circular, but it may be elliptical or rectangular such as rectangular.

Further, a male screw part 1a for screwing the tip member 2 is formed in the front part of the outer shaft 1, and an incomplete screw part in which the male screw part 1a is not formed in front of the male screw part 1a. 1g is formed, and a conical portion 1h whose diameter decreases toward the tip is formed at the front portion of the incomplete screw portion 1g. A projection 1b that positions the tip member 2 in the circumferential direction with respect to the outer shaft 1 is formed on the conical portion 1h, which is a part of the incomplete screw portion 1g, and overcomes the projection 2e of the tip member 2. The flat portion 2h of the restricting portion 2f can be brought into contact with the flat portion 2h. In addition, the flat part 1c is also formed in the protrusion (regulated part) 1b of the outer shaft 1 that contacts the flat part 2h of the restricting part 2f. That is, when the flat surface portion 2h of the restricting portion 2f and the flat surface portion 1c of the protruding portion (restricted portion) 1b come into contact with each other, the screwing restriction of the tip member 2 with respect to the shaft tube 1 is performed. Then, by positioning the tip member 2 with respect to the outer shaft 1, the projection 2 a of the tip member 2 and a clip to be described later are also positioned.
A recess (notch) 1d formed in the front end portion of the outer shaft 1 is a positioning recess when the outer shaft 1 and the grip portion 4 are injection-molded by means of two-color molding. It is also a concave portion for positioning when the cylinder is assembled to the outer shaft 1. The recess 1d is formed so that the vicinity of the tip of the shaft tube 1 is elastically reduced in diameter when the protrusion 2e of the tip member 2 gets over the protrusion (regulated portion) 1b of the shaft tube 1. It is also a space part. That is, when the protrusion 2e of the tip member 2 gets over the protrusion (regulated portion) 1b of the shaft cylinder 1, the protrusions 2e and 1b are also contracted by their own elastic deformation force. However, the diameter also decreases toward the recess 1d. Then, when the tip member 2 is screwed into the shaft tube 1 by this space portion (recessed portion 1b), the wear or damage of the protrusion 2e of the tip member 2 and the protrusion (controlled portion) 1b of the shaft tube 1 is achieved. Is prevented as much as possible.

  Next, the screwing operation of the shaft tube 1 and the tip member 2 will be described. When screwing (rotation) of the shaft cylinder 1 and the tip member 2 starts, the protrusion 2e of the tip member 2 abuts on the protrusion (regulated portion) 1b of the shaft cylinder 1 (see FIG. 10), and the protrusion It tries to get over the part 1b (see FIG. 11). At this time, the vicinity of the tip of the shaft tube 1 is easily deformed inward by the concave portion 1d, and the diameter is thereby reduced. When the leading member 2 further rotates, the protrusion 2e of the leading member 2 gets over the protruding portion (restricted portion) 1b. At this time, the flat portion 2h of the restricting portion 2f of the leading member 2 is the flat surface of the protruding portion (restricted portion) 1b. It contacts the part 1c (see FIG. 12). Thus, the screwing of the shaft tube 1 and the tip member 2 is completed, and the tip member 2 is positioned with respect to the shaft tube 1. That is, the screwing (rotation) of the tip member 2 with respect to the shaft cylinder 1 is restricted, and further rotation is prevented.

An inner shaft 5 is inserted in the rear portion of the outer shaft 1, and a tail crown 6 is formed in the rear portion of the inner shaft 5 so as to sandwich a clip to be described later. 1 protrudes from the rear end. An attachment base 8 of the clip 7 is sandwiched between the rear end portion of the outer shaft 1 and the tail crown 6, and serves as a fixing portion to the outer shaft 1. The fixed portion between the outer shaft 1 and the base portion 8 of the clip 7 is an inclined surface (inclined surface portions 8a and 1e) formed with each other, and a streamlined step portion 4a formed on the grip member 4 and the like. Coupled with this, the aesthetics are further improved.
Three longitudinal ribs 5a are formed in the longitudinal direction at the lower part of the tail crown 6, and a protrusion 5b is formed at the middle part thereof. The former vertical rib 5a is for preventing the clip 7 from swinging with respect to the inner shaft 5, and the latter protrusion 5b is engaged with a recess 8b formed in the base 8 of the clip 7, The relative rotation with 5 is prevented.
Further, the base portion 8 of the clip 7 is formed with a flange portion 8c facing downward, and is fitted into a step portion 1f formed on the inclined surface portion 1e of the outer shaft 1. Specifically, the flange portion 8 c of the clip 7 is fitted so as to surround the step portion 1 f of the outer shaft 1. Reference numeral 8d denotes a notch formed on the inner surface of the base 8, and is formed to avoid interference with a rhombus-shaped protrusion 9 described later when the clip 7 is inserted from the front of the inner shaft 5. .
Further, a rhombus-shaped protrusion 9 is formed on the rear portion of the outer surface of the inner shaft 5 at a position facing the inner shaft 5, and is fitted in a through hole 10 formed in the outer shaft 1. That is, the fitting of the protrusions 9 to the through holes 10 prevents the inner shaft 5 from falling off the outer shaft 1.

Next, the inner shaft 5 will be described in detail. On the surface of the inner shaft 5, a plurality of rhombus-shaped recesses 11 are continuously formed. The rhombus-shaped recess 11 is composed of four triangular surface portions 11 a. Then, one side of the connecting portion located inside the four triangular surface portions 11 a is deeply formed toward the central portion of the recess 11, although it is raised and connected outward. The other side located inside is connected at the deepest portion of the recess 11. That is, the diamond-shaped recess 11 is gradually formed deeper toward the center. In other words, the four sides 11b located on the outer periphery of the rhombus-shaped recess 11 are formed high, and the four sides 11b are also a connecting portion with the adjacent rhombus-shaped recess 11. More specifically, the triangular surface portion 11a constituting each rhombus-shaped recess 11 is gradually formed deeper from the four sides 11b toward the central portion. That is, the triangular surface portion 11a is an inclined surface that decreases toward the center. Moreover, the rhombus-shaped recessed part 11 containing these triangular surface parts 11a is connected regularly. And since the four triangular surface portions are regularly formed, the diamond-shaped concave portion 11 composed of four triangular shapes is also regularly and continuously formed. The reflection of light entering from the outside of the outer shaft 1 can also be obtained regularly.
Furthermore, the surface of the inner shaft 5 having the rhombic recess 11 on the surface is a glossy surface so that light can be easily reflected. In this example, the properties of the material itself and the gloss to be molded are obtained, but glossy clear coating or the like may be applied to the surface of the inner shaft 5 or resin plating. Alternatively, gloss treatment may be performed by transfer or the like. The maximum circumscribed circle in which the rhombic concave portion 11 of the inner shaft 5 is formed is slightly smaller than the inner diameter of the outer shaft 1. That is, a gap S is formed between the inner shaft 5 and the outer shaft 1. This prevents scratches and the like when the inner shaft 5 is inserted into the outer shaft 1. In addition, by providing the gap S, it is possible to obtain reflection of light from the top 11c of the rhombus-shaped recess 11, and in combination with reflection of light from the triangular surface portion 11a, a stereoscopic effect with a greater depth can be obtained. It is done.
In the present embodiment, the rhombic concave portion 11 is composed of four triangular surface portions 11a, but may be composed of two triangular surface portions. Although the types of reflection angles are reduced as compared with the four triangular surface portions, a stereoscopic effect with a sufficient depth can be obtained.

A cursive body is arranged in the shaft cylinder of the present embodiment so as to appear and disappear. The curving operation of the cursive body is performed by a retracting mechanism called a debit cam mechanism. The details will be described below.
A cam groove 12 and a cam projection 13 are formed in the longitudinal direction behind the inner surface of the inner shaft 5, and an inclined cam surface 13 a is formed on the front end surface of the cam projection 13. Four protrusions 14 are formed at equally spaced positions on the intermediate portion of the inner surface of the inner shaft 5. The four protrusions 14 prevent the rotor, which will be described later, from dropping from the inner shaft 5.
A rotor 15 is inserted into the rear portion of the inner shaft 5. A sliding projection 16 that slides in the cam groove 12 is formed on the outer periphery of the rotor 15, and an inclined cam that engages with the cam surface 13 is formed on the rear end surface of the sliding projection 16. A surface 16a is formed. Further, a flange 15a is formed on the outer peripheral portion of the front end of the rotor 15, and receives the rear portion of a writing body (oil-based ballpoint pen) to be described later. The curling portion 15a guides the outer peripheral edge of the rear part of the cursive body, thereby preventing the curling of the cursive body.
A knock member 17 is disposed at the rear part of the rotor 15, and the rear part projects from the rear end opening of the inner shaft 5. At the front end portion of the knock member 17, a triangular angled inclined surface 18 is formed so as to engage with the cam surface 16 a of the rotor 15 and press and rotate the rotor 15. A protrusion 19 that slides on the cam groove 12 of the inner shaft 5 is formed on the front outer peripheral surface of the knock member 17.
Reference numeral 20 denotes a water-based ballpoint pen, and a pen tip 20 a serving as a writing portion is attached to the tip of the oil-based ballpoint pen 20. However, it is not limited to a water-based ballpoint pen, and may be a writing body composed of an oil-based ballpoint pen or a mechanical pencil unit. The oil-based ballpoint pen 20 is urged rearward by a resilient member 21 such as a coil spring. In addition, when the writing body 20 is biased by the elastic member 21, the rotor 15 and the knock member 17 are also biased rearward.

In this embodiment, the outer surface and the inner surface of the outer shaft 1 are smooth circumferential surfaces. For example, the inner surface of the inner shaft 5 has a rhombus-like recess or protrusion. May be formed. However, it is preferable to align the inner shaft 5 and the outer shaft 1 so as not to prevent the reflection of light rays from the inner shaft 5.
Moreover, since the inner shaft 5 in which the diamond-shaped recess 11 is formed is inserted into the outer shaft 1, in other words, the diamond-shaped recess 11 is surrounded by the outer shaft 1, the touch of the recess 11 is fingered. In spite of this, a good writing feeling can be obtained.

The front external view which shows an example of this invention. The side view of the nest 1. FIG. 3 is a top view of FIG. 2. The longitudinal cross-sectional view of FIG. The longitudinal cross-sectional view of a tip member. FIG. 6 is a perspective view of FIG. 5. External perspective view of outer shaft (when grip is not attached). The principal part enlarged view of FIG. The principal part enlarged view of FIG. Explanatory drawing which shows the screwing operation | movement of a shaft cylinder and a front member. Explanatory drawing which shows the screwing operation | movement of a shaft cylinder and a front member. Explanatory drawing which shows the screwing operation | movement of a shaft cylinder and a front member. The external appearance perspective view of an inner shaft. FIG. 14 is a longitudinal sectional view of FIG. 13. The figure which looked at FIG. 13 from the bottom. External view of a clip. The external appearance perspective view of a rotor. The external appearance perspective view of a knock member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer shaft 2 Tip member 3 Reduced diameter part 4 Grip part 5 Inner shaft 6 Tail crown 7 Clip 8 Base part 9 Protrusion 10 Through hole 11 Recess 12 Cam groove 13 Cam protrusion 14 Protrusion 15 Rotor 16 Sliding protrusion 17 Knock member 18 Yamagata Inclined surface 19 Projection 20 Cursive

Claims (3)

A connecting structure in which a tip member is screwed to an end portion of a shaft tube, and a male screw portion is formed in the vicinity of the end portion of the shaft tube, and an incomplete screw portion is formed in front of the male screw portion. Protruding restriction portions are provided on the complete screw portion, while an internal thread portion is formed on the inner surface of the tip member, an incomplete screw portion is formed in front of the internal thread portion, and the incomplete screw portion A connecting structure comprising a protrusion engaging with the restricting portion and a restricted portion contacting the restricting portion. 2. The coupling according to claim 1, wherein a front portion of the incomplete threaded portion of the shaft cylinder is a conical portion having a diameter reduced toward the front, and the protruding restricting portion is provided on the conical portion. Construction. The connection structure according to claim 1, wherein a notch portion is formed in the incomplete thread portion of the shaft tube.

Images