TWM445501U - Barrel of writing implement - Google Patents

Description

Pen shaft

This creation is about the shaft of the writing instrument, especially the decorative ring that is conducive to aesthetics. When the shaft is disassembled, the decorative ring is separated from the shaft, thus preventing the decorative ring from falling off the axis of the lost instrument. Rod.

In the past, the shaft of the pen has the shaft disclosed in Patent Document 1. Specifically, the shaft of the pen of Patent Document 1 has a soft grip member and a grip member. Thereafter, the end portion forms a stepped portion or an inclined portion of the rear end reducing diameter, and the decorative ring is attached to the stepped portion or the inclined portion of the grip member. Moreover, the rear end of the grip member is formed with a concave portion and/or a convex portion which is undulated in the axial direction, and the front end of the decorative ring forms a convex portion and/or a concave portion corresponding to the concave portion and/or the convex portion, and the grip member member The recesses and/or the projections are fitted to the projections and/or recesses of the decorative ring to prevent the decorative ring from rotating.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2005-47219

However, according to the structure of the shaft disclosed in the above Patent Document 1, in order to prevent the rotation of the decorative ring, the concave portion and/or the convex portion formed on the grip member and the decorative ring are completely exposed on the surface of the grip, thereby detracting from the appearance. The issue of beauty.

In addition, the grip member and the decorative ring are not fixed to each other. When the shaft is disassembled in order to replace or replenish the refill or the like, the grip member and the decorative ring are separated and separated, and the decorative ring is lost. Is the room for further improvement.

This creative department has been improved through the above problems. The purpose of this creation is to provide a shaft for a writing instrument, which is advantageous for the beautiful installation of the decorative ring, and when the shaft is disassembled, the decorative ring is separated and disengaged, and the decorative ring can be prevented from falling.

In order to achieve the above object, the present invention is a shaft which is provided with a decorative ring on the outer periphery of the shaft, and has: a front end shaft portion constituting one part of the shaft, and a rear shaft rod connected to the front end shaft portion a part, and one end of the front end shaft portion or the rear end shaft portion facing the other end, and a portion thereof a connecting portion that can be inserted into the other of the other side; wherein the portion of the connecting portion that is inserted into the other of the other portions is a first connecting portion, and is located after the first connecting portion is inserted a portion of the other outer portion is a second connecting portion; a plurality of convex portions that are circumferentially spaced apart from each other and radially protruded are formed on the outer circumference of the second connecting portion; and the decorative ring is embedded in the second connecting portion The position of the convex portion can be covered, and after the first connecting portion is inserted, the first connecting portion is positioned between the front end shaft portion and the rear end shaft portion.

Further, the inner diameter of the decorative ring is set to be larger than the outer diameter of the portion of the second connecting portion that does not include the convex portion, and is smaller than the diameter of the virtual circumscribed circle passing through the outermost point (vertex) of the convex portion.

Further, a locking portion that can be locked to the inner circumference of the other shaft portion is formed on the outer circumference of the first coupling portion.

Further, a plurality of concave portions that are radially recessed in the circumferential direction are formed on the outer circumference of the first connecting portion, and a position of the concave portion in the circumferential direction is set to be a circumference of the convex portion in the connecting portion. The position of the direction is staggered as a feature.

According to the shaft of the writing instrument of the present invention, since the decorative ring is positioned in a position where the convex portion of the second connecting portion can be covered, the decorative decorative ring can be maintained beautifully. Moreover, since the decorative ring is caught and rotated by being nested in the second connecting portion, the assembly work can be easily performed. Moreover, when the front end shaft portion and the rear end shaft portion are detached, the decorative ring is positioned on the second joint portion by the sleeve, so that the decorative ring can be prevented from being lost.

An embodiment of the present invention will be described below with reference to the accompanying drawings. The first and second figures show a writing instrument 10 according to an embodiment of the present invention. The writing instrument 10 has a shaft having a front end opening 12b formed at its front end. 12, and an operating portion 14 which is integrally formed with the pen holder of the rear end opening 12a of the protruding shaft 12.

A writing pen mechanism 16 is housed inside the shaft 12. Refill mechanism 16 Select the applicable mechanism depending on the type of pen. For example, when the writing instrument is configured as a ballpoint pen, as shown in the third figure, the refill mechanism 16 is a mechanism including a component of the refill body 18, the spring 20, and a conventional rotating cam mechanism (not shown). The portion 14 is integrally coupled to a portion of a conventional rotary cam mechanism. The cartridge body 18 can be a removable refill having a steel ball at the front end. Moreover, when the writing instrument constitutes a mechanical pencil, the refill mechanism is a conventional core feeding mechanism (both not shown) having a pen core tube, a refill collet, a collet tow, and the like, which internally house a pencil lead, and a refill. The body 18 can be biased so that its front end projects the front end opening 12b of the shaft 12 for writing.

The shaft 12 is formed by a front end shaft portion 30 of the rod portion before the front end has a front end opening 12b; and a rear end shaft portion 32 after the rear end has a rear end opening 12a; and is integrally formed behind the front end shaft portion 30 And a part of the connecting portion 34 which can be inserted into the inner portion of the rear end shaft portion 32; and a decorative ring 36 which will be described later, which is embedded in the outer periphery of the connecting portion 34. Further, as shown in the fourth figure, the portion (the last stage) into which the rear end shaft portion 32 can be inserted into the connecting portion 34 is defined as the "first connecting portion 34c", and the first connecting portion 34c is inserted. The portion (base portion) exposed to the outside of the rear end shaft portion 32 is defined as "second joint portion 34b".

The front end shaft portion 30 is formed in a smooth conical curved shape whose outer diameter gradually decreases from the rear end toward the front end opening 12b. Further, the rear end portion of the front end shaft portion 30 is integrally formed with a coupling portion 34 extending rearward from the rear end, and the coupling portion 34 is formed to have a diameter smaller than the diameter of the front end shaft portion 30, so that between the front end shaft portion 30 and the joint portion 34 A step portion (step portion) 35 is formed. The outer peripheral surface of the joint portion 34 is formed with a male screw 34a that can be locked to the inner circumference of the rear end shaft portion 32 as a locking portion.

As shown in the third figure, the outer diameter of the rear end shaft portion 32 is formed into an equal-diameter tubular shape having the same length from the front end to the rear end opening 12a and the (maximum) outer diameter of the rear end portion of the rod portion of the front end shaft portion 30. Further, the inner peripheral surface of the front end portion of the rear end shaft portion 32 is formed with a female screw 32a which is locked by the locking portion as the engaged portion.

Then, the connecting portion 34 is inserted into the inside from the front end of the rear end shaft portion 32, so that the male screw 34a is screwed to the female screw 32a, and the front end shaft portion 30 is passed through The joint portion 34 is coupled to the rear shaft portion 32 as a shaft 12.

In the coupled state of the front end shaft portion 30 and the rear end shaft portion 32, the trim ring 36 is fitted between the two shaft portions. The decorative ring 36 is fixed to the joint portion 34.

Next, the structure in which the decorative ring 36 is attached and fixed to the joint portion 34 will be described in detail with reference to the fourth embodiment.

The outer peripheral portion of the connecting portion 34 (second connecting portion 34b) is formed with a rib-like convex portion 34d that extends rearward from the margin of the step portion 35 while projecting radially. The axial length of the convex portion 34d is substantially the same as the axial length of the decorative ring 36. Further, the cross section of the convex portion 34d protrudes substantially in an arc shape as shown in Fig. 5, and it is preferable that the convex portions 34d have a plurality of convex portions arranged at equal angles, and the number thereof is preferably three or more. In this example, as shown in the fifth figure, four convex portions 34d having an angular interval of 90 degrees are formed in the circumferential direction.

Further, as shown in the fourth figure, the connecting portion 34 (the first connecting portion 34c) is formed with a plurality of radially concave recess portions 34e between the convex portion 34d and the male screw 34a as viewed in the axial direction. At least a portion of the recess 34e is located within a distance from the rear end of the projection 34d to a distance below the axial length of the trim ring 36. The recessed portion 34e is preferably provided at a position shifted from the convex portion 34d in the circumferential direction. In this example, as shown in the fifth figure, it is disposed between the two convex portions 34d as viewed from the circumferential direction with a difference of 180 degrees. Two recesses 34e.

The trim ring 36 can form a thin walled ring shape. The outer diameter is substantially equal to the outer diameter of the rear end of the front end shaft portion 30 and the outer diameter of the rear end shaft portion 32. Further, the inner diameter is smaller than the second connecting portion 34b and the first connecting portion 34c of the connecting portion 34, but is slightly smaller than the imaginary circumscribed circle P of the connecting portion 34 passing through the highest (outer diameter) point of each convex portion 34d (refer to The diameter of the fifth figure). Basically, the outer peripheral surface and the inner peripheral surface of the decorative ring 36 are formed into a smooth circumferential shape without irregularities.

The front end shaft portion 30, the rear end shaft portion 32, the joint portion 34, and the decorative ring 36 may be formed of plastic or metal. When the front end shaft portion 30 and the rear end shaft portion 32 are integrally formed of a plastic material, the concave portion 34e of the joint portion 34 can be used as a injection gate portion during molding.

The shaft 12 of the above-described pen 10 is configured such that when the decorative ring 36 is attached, the connecting portion 34 is first inserted into the decorative ring 36 with its rear end axially, and the inner diameter of the decorative ring 36 is slightly larger than the first connecting portion. At the same time, since the recessed portion 34e is formed on the outer circumference of the first connecting portion 34c, the first connecting portion 34c can be inserted into the middle without being disturbed by the connecting portion 34, and the connecting portion 34 can be smoothly inserted without damaging the connecting portion 34.

However, when the decorative ring 36 reaches the portion where the convex portion 34d is formed, the decorative ring 36 is slightly smaller than the outer diameter P of the imaginary circumscribed circle passing through the highest (outer diameter) point of the convex portion 34d. The convex portion 34d interferes with each other, and the decorative ring 36 is subjected to tension. On the one hand, the convex portion 34d (and the connecting portion 34) is subjected to a compressive force, and the two members are elastically deformed, so that the decorative ring 36 is forced to be tightly fitted. It is fixed at a position covering the convex portion 34d.

As shown in the sixth figure, the inner circumference of the decorative ring 36 is immediately adjacent to the highest point of each convex portion 34d, and a gap is formed between the adjacent points of the adjacent two convex portions 34d and the connecting portion 34. The decorative ring 36 uses this space to cause deformation mainly in the inner diameter direction at a portion where the convex portion 34d does not contact between the highest points of the adjacent two convex portions 34d. At this time, when the number of the convex portions 34d is small, the maximum deformation amount of the decorative ring 36 becomes large, and the deformation is excessively large to become a non-circular flaw; further, the convex portion 34d is decorated when the angle is not equal. The ring 36 has an eccentricity; on the contrary, when the number of the convex portions 34d is too large, when the inner diameter of the decorative ring 36 and the highest point of the convex portion 34d have any one or two errors, the decorative ring 36 is It is difficult to deform sufficiently so that the convex portion 34d of the joint portion 34 cannot be inserted into the loop of the decorative ring 36.

Therefore, the number of the convex portions 34d is preferably 3 to 6, and the convex portions 34d may be arranged at equal angles. With this configuration, when the decorative ring 36 is deformed, it is ensured that it is substantially circular and can prevent eccentricity. Further, even if the error of the inner diameter of the decorative ring 36 and the position of the highest point of the convex portion 34d is large, the degree of deformation of the portion of the decorative ring 36 that is not in contact with the convex portion 34d can be absorbed to absorb the error.

When the connecting portion 34 is inserted into the decorative ring 36, the circumferential position can be arbitrary, that is, it is not necessary to directly insert the circumferential position, so that the mounting work can be easily performed.

Further, the concave portion 34e of the joint portion 34 is located in the circumferential direction from the convex portion 34d. In position, when the convex portion 34d is inserted into the decorative ring 36, the deformation of the decorative ring 36 can be smoothly performed by reducing the friction of the concave portion 34e. In other words, the decorative ring 36 is deformed in the inner diameter direction by the portion which is not in contact with the convex portion 34d between the highest points of the adjacent two convex portions 34d as described above, and the concave portion 34e is formed by fitting the portion, so that the decoration is easily induced. The deformation of the inner diameter direction of the ring 36.

Thus, the decorative ring 36遂 can be fixedly fixed at the joint portion 34 and prevented from rotating. Further, since it is integrally assembled with the front end shaft portion 30, for example, when the front end shaft portion 30 is detached from the rear end shaft portion 32 in order to replace the pen core body or the supplementary pencil core, the decorative ring 36 is attached to The portion 34 is joined to prevent the decorative ring 36 from being lost.

Further, since it is not necessary to use an adhesive, the decorative ring 36 can be directly fitted to the joint portion 34, so that the work is easy and the other portions are not soiled. Further, the decorative ring 36 is mainly fitted by elastic deformation. If a large force is applied to the decorative ring 36 and pulled outward from the convex portion 34d, the decorative ring 36 can be removed, so that it can be easily reinstalled.

The color of the front axle portion 30, the rear axle portion 32 and the decorative ring 36 can be considered to be freely selected for color matching. For example, if the front end shaft portion 30 and the rear end shaft portion 32 are used in the same color, and the decorative ring 36 is used in different colors, the decorative ring 36 becomes a focus point, and the decorativeness can be increased. Moreover, if the decorative rings 36 of various colors are prepared, and the front end shaft portion 30 and the rear end shaft portion 32 are of a single color, the color of the decorative ring 36 can be changed, and the change of the appearance pattern can be simply increased. When the front end shaft portion 30 and the rear end shaft portion 32 respectively form members of a single color, component management is easy.

Moreover, when the color of the decorative ring 36 is the same as the color of the ink stored in the refill or the pen core, the color of the ink or the refill of the refill body can be grasped from the appearance of the writing instrument.

Further, in the above embodiment, the connecting portion 34 is integrally formed with the front end shaft portion 30, but is not limited thereto, and the connecting portion 34 is integrally formed on the rear end shaft portion 32 instead of the front end shaft portion 30. Nothing.

In the above embodiment, the member composed of a plurality of components is changed to a single A component construction is also feasible. Further, it is also possible to change a member composed of a single member to be composed of a plurality of members.

10‧‧‧ pens

12‧‧‧ shaft

12a‧‧‧Back end opening

12b‧‧‧ front opening

14‧‧‧Operation Department

16‧‧‧Refill mechanism

18‧‧‧ pen body

20‧‧‧ Spring

30‧‧‧ front axle part

32‧‧‧ Rear axle part

32a‧‧‧ female thread

34‧‧‧Linked section

34a‧‧‧A male thread

34b‧‧‧Second link

34c‧‧‧ first link

34d‧‧‧ convex

34e‧‧‧ recess

35‧‧‧ section of the section

36‧‧‧ decorative ring

P‧‧‧Imaginary circumscribed circle

The first figure is a plan view of the entire pen holder including the shaft of the writing instrument according to the embodiment of the present invention.

The second figure is a side view of the entire pen holder including the shaft of the pen shown in the first figure.

The third figure is a partial exploded view of the writing instrument including the shaft of the writing instrument shown in the first figure.

The fourth figure shows an enlarged view of the shaft end portion and the joint portion of the shaft at the front end.

Figure 5 is a cross-sectional view taken along line 5-5 of the fourth figure.

The sixth figure is equivalent to the fifth state in which the decorative ring is embedded in the second joint portion. A cross-sectional view of the figure.

12‧‧‧ shaft

12a‧‧‧Back end opening

12b‧‧‧ front opening

16‧‧‧Refill mechanism

18‧‧‧ pen body

20‧‧‧ Spring

30‧‧‧ front axle part

32‧‧‧ Rear axle part

32a‧‧‧ female thread

34a‧‧‧A male thread

34d‧‧‧ convex

34e‧‧‧ recess

35‧‧‧ section of the section

36‧‧‧ decorative ring

Claims (4)

a shaft having a writing ring with a decorative ring on the outer circumference of the shaft, having: a front end shaft portion constituting one part of the shaft, a shaft portion connected to the front end shaft portion, and a front shaft portion One of the rod portion or the rear end shaft portion facing the other end portion, and a portion of the rod portion or the rear end shaft portion is insertable to the other portion of the other side; wherein the joint portion is to be inserted into the other portion A portion inside the one portion is a first connecting portion, and a portion located outside the other connecting portion after the first connecting portion is a second connecting portion; and a plurality of circumferential directions are formed on the outer circumference of the second connecting portion a convex portion that is disposed at an interval and protrudes in a radial direction; the decorative ring is embedded in a position at which the second connecting portion can cover the protruding portion, and is positioned on the front end shaft portion after the first connecting portion is inserted Between the rear end shaft portion and the above. The shaft of the writing instrument according to claim 1, wherein an inner diameter of the decorative ring is set to be larger than an outer diameter of a portion of the second connecting portion that does not include the convex portion, and is smaller than an outermost portion of the convex portion The diameter of the imaginary circumcircle of the point (vertex). The shaft of the writing instrument according to claim 1 or 2, wherein the outer circumference of the first joint portion is formed with a locking portion that can be locked to the inner circumference of the other one. The shaft of the writing instrument according to claim 1 or 2, wherein the outer circumference of the first joint portion is formed with a plurality of radially concave recesses spaced apart in the circumferential direction, and in the joint portion, the recess The position in the circumferential direction is set to be shifted from the position of the convex portion in the circumferential direction.