JP7153446B2 - writing instrument - Google Patents

Description

TECHNICAL FIELD The present invention relates to a writing instrument having a detachable clip portion.

2. Description of the Related Art Conventionally, there has been known a writing instrument in which a clip extending along the cylinder is formed on the outer peripheral surface of the cylinder constituting the writing instrument. As a writing instrument equipped with such a clip, for example, Patent Document 1 discloses that a projecting piece that protrudes from the outer peripheral surface of a cylindrical body and extends in the longitudinal direction is provided to form a mounting portion that is open at the rear end and the side surface, and the clip is provided with a projecting piece. A writing instrument is disclosed in which a clip can be attached and detached by attaching a provided attachment portion to an attachment portion through an opening at the rear end and closing the opening at the rear end with a crown.

Patent No. 5996997

However, in the writing instrument described in Patent Document 1, a protruding piece is formed at a portion of the barrel that contacts the connection mechanism. If such a projecting piece is formed on the outer peripheral surface of the barrel, it becomes difficult to process the outer surface of the barrel, such as printing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a writing instrument having a detachable clip member, which allows easy processing such as printing on the outer surface of the barrel.

The writing instrument of the present invention is a writing instrument having a writing instrument body including a barrel, and a detachable clip member located on the side of the writing instrument body, and comprising a connection mechanism for connecting the clip member to the writing instrument body, A protrusion projecting radially outward is not formed in a portion of the shaft cylinder that contacts the connection mechanism.

According to the present invention having the above configuration, since the portion of the barrel that contacts the connection mechanism is not formed with a projecting portion that protrudes radially outward, the outer surface of the barrel can be easily processed such as printing.

The present invention preferably further comprises an inner cylinder attached to the rear end opening of the barrel, the inner barrel protruding to the side of the barrel and having a clip holding portion extending toward the tip side along the barrel. The clip holding portion is formed with a holding portion projecting from the surface and extending in the axial direction. The clip member is held by the clip holding portion by fitting into the insertion portion.

According to the present invention having the above configuration, the clip member can be detachably attached to the main body of the writing instrument by fitting the cut portion of the clip member into the holding portion formed in the clip holding portion of the inner cylinder.

The present invention preferably further comprises an inner cylinder attached to the rear end opening of the barrel, the inner barrel having a clip holding portion protruding laterally from the barrel, and the clip holding portion extending in the axial direction. An extending through-hole and an opening communicating with the through-hole from the side are formed, and the clip member is elastically deformable and has an arm portion having a locking portion at its tip, and the arm portion is positioned in the through-hole. , and the clip member is held by the clip holding portion by positioning the locking portion in the opening.

According to the present invention having the above configuration, the clip member can be detachably attached to the writing instrument main body by inserting the arm portion of the clip member into the through hole and positioning the locking portion in the opening communicating with the through hole. can.

Preferably, the present invention further comprises an inner cylinder attached to the rear end opening of the barrel, a thread is formed on the inner peripheral surface of the rear end portion of the barrel, and the inner cylinder has a screw thread on the outer peripheral surface. The main body portion of the inner cylinder is formed with a notch portion extending from the rear edge, and the clip member has substantially the same shape as the notch portion and is threaded on the radially outer surface. The clip member is attached to the barrel by screwing the threads of the inner cylinder into the threads of the barrel with the insertion portion disposed in the notch. .

According to the present invention having the above configuration, the clip member can be detachably attached by screwing the thread of the inner cylinder into the thread of the barrel with the insertion portion of the clip member disposed in the notch of the inner cylinder. It can be attached to the body of the writing instrument.

The present invention preferably further comprises an inner cylinder rotatably attached to the rear end opening of the barrel, the inner barrel having a cover portion extending along the barrel, and the barrel having a groove or opening. The clip member has a connection portion in which a projection having substantially the same shape as the groove or opening formed in the shaft cylinder is formed on the radial inner surface, and the projection of the clip member is connected to the groove of the clip member. Alternatively, the clip member is attached to the barrel by covering the connecting portion of the clip member from the outside in the radial direction with the cover portion in a state of being fitted in the opening.

According to the above-described configuration of the present invention, the clip member can be removed by covering the connecting portion of the clip member from the radially outer side with the cover portion in a state in which the protrusion of the clip member is fitted into the groove or opening of the barrel. It can be detachably attached to the body of the writing instrument.

The present invention preferably further comprises an inner cylinder attached to the rear end opening of the barrel, the inner barrel having a clip holding portion extending laterally of the barrel, and a clip holding portion extending radially. A hole is formed, the clip member is elastically deformable, and has a connecting portion formed with locking portions on both sides, the connecting portion being positioned in the hole, and the locking portion being locked to the edge of the hole. Thus, the clip member is held by the clip holding portion.

According to the present invention having the above configuration, the clip member can be detachably attached to the writing instrument main body by arranging the connecting portion of the clip member in the hole of the inner cylinder and locking the locking portion to the edge of the hole. can.

The present invention preferably further comprises an inner cylinder attached to the rear end opening of the barrel, the inner barrel having a clip holding portion located on the side of the barrel, the clip holding portion being attached to the barrel. A fitting groove is formed along the entire circumference of the clip holding portion in a plane parallel to the axis, the clip member has a through hole, and the edge of the through hole of the clip member fits into the fitting groove of the clip holding portion. The clip member is held by the clip holding portion by fitting.

According to the present invention having the above configuration, the clip member can be detachably attached to the writing instrument main body by fitting the edge of the through hole of the clip member into the fitting groove of the clip holding portion.

The present invention preferably further comprises an inner cylinder attached to the rear end opening of the barrel, the inner barrel having a clip holding portion including a columnar connection portion extending laterally of the barrel, and the connection A thread is formed on the peripheral surface of the part, the clip member has a through hole, a thread is formed in the through hole, and the thread of the connecting part is screwed with the thread of the through hole, A clip member is held by the clip holding portion.

According to the present invention having the above configuration, the clip member can be detachably attached to the writing instrument main body by screwing the thread of the through hole of the clip member and the thread of the connecting portion of the inner cylinder.

ADVANTAGE OF THE INVENTION According to this invention, the writing instrument provided with the removable clip member which can perform processings, such as printing, easily on the outer surface of a barrel can be provided.

1 is a perspective view showing a writing instrument according to a first embodiment of the present invention; FIG. (a) is a side view of the writing instrument shown in FIG. 1, and (b) is a cross-sectional view along the axial direction. FIG. 2 shows a barrel of the writing instrument shown in FIG. 1, where (a) is an axial cross-sectional view and (b) is a perspective view of the rear end. The inner cylinder of the knock-type writing instrument shown in FIG. 1 is shown, (a) is a perspective view, (b) is a front view, (c) is a cross-sectional view along the axial direction, and (d) is a bottom view. The rotor of the knock-type writing instrument shown in FIG. 1 is shown, (a) is a perspective view, (b) is a front view. 2 shows a knock member of the knock-type writing instrument shown in FIG. 1, (a) is a perspective view, (b) is a front view, (c) is a cross-sectional view along the axial direction, and (d) is a developed view of the front part. . The clip member of the knock-type writing instrument shown in FIG. 1 is shown, (a) is a perspective view, (b) is a front view, and (c) is a side view. FIG. 3 is a perspective view showing a writing instrument according to a second embodiment of the present invention; (a) is a side view of the writing instrument shown in FIG. 8, and (b) is a cross-sectional view along the axial direction. The inner cylinder of the knock-type writing instrument shown in FIG. 8 is shown, (a) is a perspective view, (b) is a front view, (c) is a cross-sectional view along the axial direction, and (d) is a bottom view. The clip member of the knock-type writing instrument shown in FIG. 8 is shown, (a) is a perspective view, (b) is a front view, and (c) is a side view. FIG. 11 is a perspective view showing the rear end of a writing instrument according to a third embodiment of the present invention; (a) is a side view of the writing instrument shown in FIG. 12, and (b) is a cross-sectional view along the axial direction. 13 is a perspective view showing how a clip member of the writing instrument shown in FIG. 12 is attached and detached. FIG. (a) is a side view showing how a clip member of the writing instrument shown in FIG. 12 is attached and detached, and (b) is a cross-sectional view along the axial direction. Fig. 4 shows a writing instrument according to a fourth embodiment of the present invention, where (a) is a side view and (b) is a cross-sectional view taken along the axial direction; 17 is an enlarged perspective view showing the rear end portion of the writing instrument shown in FIG. 16; FIG. 17 shows the clip member of the knock-type writing instrument shown in FIG. 16, (a) is a perspective view seen from the radially outer side, and (b) is a perspective view seen from the radially inner side. FIG. 11 is a perspective view showing the rear end of a writing instrument according to a fifth embodiment of the present invention; (a) is a side view of the writing instrument shown in FIG. 19, and (b) is a cross-sectional view along the axial direction. The inner cylinder of the knock-type writing instrument shown in FIG. 19 is shown, (a) is a perspective view seen from the rear, (b) is a perspective view seen from the front, (c) is a side view, and (d) is along the axial direction. is a cross-sectional view. The clip member of the knock-type writing instrument shown in FIG. 19 is shown, (a) is a perspective view, (b) is a front view, and (c) is a side view. FIG. 11 is a perspective view showing an inner cylinder and a clip member of a writing instrument according to a sixth embodiment of the present invention; 24 shows the inner cylinder of the writing instrument shown in FIG. 23, (a) is a front view, (b) is an axial cross-sectional view, and (c) is a top view. FIG. 24 shows a clip member of the writing instrument shown in FIG. 23, (a) is a perspective view, (b) is a bb cross-sectional view in (a), and (c) is a cc cross-sectional view in (a). FIG. 11 is a perspective view showing an inner cylinder and a clip member of a writing instrument according to a seventh embodiment of the present invention; The inner cylinder and clip member of the writing implement according to the seventh embodiment of the present invention are shown, (a) is a front view, and (b) is an axial cross-sectional view. The inner cylinder of the writing implement shown in FIG. 26 is shown, (a) is a perspective view, (b) is a front view. The clip member of the writing instrument shown in FIG. 26 is shown, (a) is a perspective view, (b) is a side view.

<First Embodiment>
Hereinafter, a writing instrument according to a first embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the side on which the brush tip of the refill appears and retracts is referred to as the front end side or front side, and the side on which the knock portion of the retraction mechanism extends is referred to as the rear end side or rear side.

FIG. 1 is a perspective view showing a writing instrument according to a first embodiment of the invention. 2A is a side view of the writing instrument shown in FIG. 1, and FIG. 2B is a cross-sectional view along the axial direction. As shown in FIGS. 1 and 2, the knock-type writing instrument 1 of this embodiment includes a cylindrical barrel 2, a refill member 4 accommodated in the barrel 2, and a refill member 4 provided at the rear end of the barrel 2. and a clip member 8 connected to the retractable mechanism 6. The barrel 2, the refill member 4, and the protruding/retracting mechanism 6 constitute the main body of the writing instrument.

FIG. 3 shows the barrel of the writing instrument shown in FIG. 1, (a) is an axial cross-sectional view, and (b) is a perspective view of the rear end. As shown in FIG. 3, the barrel 2 is formed in a cylindrical shape with a tapered tip. A front end opening 2a is formed at the front end of the barrel 2, and a rear end opening 2b is formed at the rear end. A threaded portion (thread) 2 c is formed on the inner surface of the rear end portion of the barrel 2 . A stepped portion 2d is formed in the intermediate portion of the barrel 2, and the inner diameter of the barrel 2 on the rear end side of the stepped portion 2d is larger than the inner diameter on the tip side. A triangular notch 2e is formed at a predetermined angular position on the rear edge of the barrel 2. As shown in FIG. A through hole 2f is formed in front of the notch 2e for elastic deformation when the protrusion 10d5 is fitted when the inner cylinder 10 constituting the retracting mechanism 6 is attached by screwing. In the present embodiment, no projecting portion is formed on the portion of the shaft tube 2 that corresponds to the connection mechanism for connecting the clip.

4 shows the inner cylinder of the knock-type writing instrument shown in FIG. 1, (a) is a perspective view, (b) is a front view, (c) is a cross-sectional view along the axial direction, and (d) is a bottom view. . As shown in FIG. 4, the inner cylinder 10 includes a cylindrical body portion 10a, a cam portion 10b extending from the body portion 10a to the front end side, a rear end portion 10c connected to the rear end side of the body portion 10a, A clip holding portion 10d extending laterally from the rear end portion 10c is provided. The body portion 10a, the cam portion 10b, the rear end portion 10c, and the clip holding portion 10d are integrally formed.

The main body portion 10a is cylindrical, and the outer diameter of the main body portion 10a is substantially equal to the inner diameter of the shaft tube 2. As shown in FIG. A threaded portion (thread) 10e is formed on the outer peripheral surface of the body portion 10a. Axial protrusions 10f extending in the axial direction are formed on the inner peripheral surface of the main body 10a at opposing positions at angular intervals of 180 degrees.

The cam portion 10b has a substantially cylindrical shape, and its inner diameter and outer diameter are equal to those of the main body portion 10a. As shown in FIG. 4A, first notches 18 and second notches 20 are alternately formed in the cam portion 10b at equal angular (90 degree) intervals in the circumferential direction. The first notch portion 18 includes an axial groove portion 18a extending axially rearward from the tip end edge, and a guide portion 18b formed continuously with the axial groove portion 18a clockwise (to the right in FIG. 4(b)). have The axial groove portion 18 a is a groove extending in the axial direction with a constant circumferential width and extending rearward beyond the second notch portion 20 . The guide portion 18b is formed in a triangular shape such that the cutting depth (the distance from the tip edge of the inner cylinder) decreases clockwise when viewed from the peripheral surface. The second notch 20 is formed in a triangular shape such that the cut depth decreases clockwise when viewed from the peripheral surface. The maximum depth of cut of the second cutout 20 is smaller than the depth of cut of the axial groove portion 18a of the first cutout 18 and larger than the maximum depth of cut of the guide portion 18b. The position of the counterclockwise (left direction in FIG. 4B) end of the second notch 20 coincides with the position of the clockwise end of the guide portion 18b of the adjacent first notch 18. . The position of the clockwise end of the second notch 20 coincides with the position of the counterclockwise end of the axial groove 18 a of the adjacent first notch 18 .
The rear end portion 10 c is formed in a cylindrical shape with an outer diameter slightly smaller than the outer diameter of the barrel 2 .

The clip holding portion 10d includes a connecting portion 10d1 that extends radially outward and forward from the rear end portion 10c, a body portion 10d2 that extends forward from the front end of the connecting portion 10d1, and a radially inner surface of the body portion 10d2. and a second holding portion 10d4 formed continuously from the first holding portion 10d3. The first holding portion 10d3 includes a base portion 10d3a extending in the axial direction and standing on the inner surface of the main body portion 10d2, and a widened portion 10d3b formed radially inward of the base portion 10d3a. The cross-sectional shape is T-shaped. The width of the second holding portion 10d4 is equal to the width of the widened portion 10d3b of the first holding portion 10d3. A protruding portion 10d5 is formed on the surface of the second holding portion 10d4 on the tip side (lower side in FIG. 4(b)).

FIG. 5 shows the rotor of the knock-type writing instrument shown in FIG. 1, (a) being a perspective view and (b) being a front view. As shown in FIG. 5 , the rotor 12 has a cylindrical base 21 , four cam columns 28 extending forward from the base 21 , and a holding portion 30 connected to the front ends of the cam columns 28 .
The base portion 21 includes a cylindrical body portion 22 , an annular rear end portion 24 connected to the rear end side of the body portion 22 , and an annular ring portion 26 connected to the front end side of the body portion 22 . , has

The body portion 22 is formed in a cylindrical shape, and has an outer diameter slightly smaller than the inner diameter of the front portion of the knock member 16, which will be described later. The rear end portion of the main body portion 22 has a reduced diameter portion 22a that is reduced in diameter toward the rear.

The rear end portion 24 includes a cylindrical portion 24a that continues to the rear end of the main body portion 22, a truncated conical portion 24b that continues to the rear end of the cylindrical portion 24a, and a truncated conical portion 24b. and a display portion 24c continuous to the rear end of the . The cylindrical portion 24a has a circular cross-sectional shape that is the same in the axial direction. The outer diameter of the cylindrical portion 24 a is slightly smaller than the inner diameter of the rear portion 36 of the knock member 16 . The truncated cone portion 24b has a truncated cone shape with a larger diameter on the tip side. The diameter of the rear end of the truncated cone portion 24b is substantially equal to the diameters of the cylindrical portion 24a and the display portion 24c. The display portion 24c is a cylindrical portion extending rearward from the rear end of the truncated cone portion 24b. A plurality of grooves extending in the axial direction are formed in the display portion 24c.

The annular portion 26 is connected to the front end portion of the body portion 22 and is formed in an annular shape. The outer diameter of the annular portion 26 is larger than the outer diameter of the body portion 22 and smaller than the outer diameter of the holding portion 30 . Four cam protrusions 26a are formed on the rear surface of the annular portion 26 at intervals of 90 degrees in the circumferential direction. The cam protrusion 26a has an isosceles triangular shape that protrudes rearward.

The cam column 28 has an arcuate cross-sectional shape on a plane perpendicular to the axial direction, is connected to the radial outer peripheral surface of the annular portion 26 of the base portion 21, and extends forward. The cam columns 28 are attached at intervals of 90 degrees in the circumferential direction. The cam column 28 has a circumferential width half that of the cam protrusion 26 a formed on the annular portion 26 . Each cam column 28 is connected to the outer surface of the cam protrusion 26a of the annular portion 26 in the right half of FIGS. 5(b) to 5(d). The rear end surface of the cam column 28 is flush with the rear end surface of the clockwise half of the cam protrusion 26 a of the annular portion 26 . That is, the rear end surface of the cam column 28 is formed as an inclined surface such that the height of the rearward protrusion is lowered in the clockwise direction.

The holding portion 30 is formed in an annular shape. The inner and outer diameters of the holding portion 30 are equal to the inner and outer diameters of the cam column 28, respectively.
The spring member 14 is a spring member made of a spiral metal member.

FIG. 6 shows the knock member of the knock type writing instrument shown in FIG. It is a development view. The knock member 16 has a front portion 32 , an intermediate portion 34 that continues to the rear of the front portion, and a rear portion 36 that continues to the rear of the intermediate portion 34 .
The front portion 32 has a cylindrical internal space that opens at least forward, and is formed by a pair of wall surfaces having arcuate cross-sections. The outer diameter of the front portion 32 is slightly smaller than the inner diameter of the body portion 10 a of the inner cylinder 10 . Also, the inner diameter of the front portion 32 is slightly larger than the outer diameter of the body portion 22 of the knock member 16 . A pair of axial grooves 32a extending in the axial direction, opening forward, and extending rearward for a predetermined length are formed in the front portion 32 at intervals of 180 degrees in the circumferential direction. On the end surface of the front end portion of the front portion 32, three triangular protrusions 32b are formed in the circumferential direction between the pair of axial groove portions 32a.

The intermediate portion 34 is formed in an annular shape, and a locking portion 34b projecting in an annular shape is formed on the inner surface. As shown in FIG. 6(c), it is preferable that the front portion of the engaging portion 34b is formed with an inclined surface that decreases in diameter toward the rear.
The rear portion 36 is cylindrically formed. In addition, the opposing portions of the outer peripheral surface are formed flat.

As shown in FIG. 1 , the knock member 16 is inserted into the inner cylinder 10 from the rear such that the axial protrusion 10 f of the inner cylinder 10 is positioned within the axial groove 32 a of the knock member 16 . Further, the rotor 12 is inserted into the knock member 16 from the front until the truncated cone portion 24b formed in the base portion 21 exceeds the engaging portion 34b of the knock member 16. As shown in FIG. The cam portion 10b of the inner cylinder 10 and the cam column 28 of the rotor 12 are along the inner surface of the shaft cylinder 2 and are positioned on the same circle.

With such a configuration, the knock member 16 is restrained from rotating with respect to the inner cylinder 10 and is axially movable relative to the inner cylinder 10 . Further, the rotor 12 is rotatable with respect to the knock member 16, and the position where the engaging portion 34b of the knock member 16 contacts the truncated cone portion 24b of the rotor 12 and the projections 32b1 and 32b2 of the knock member 16 , 32b3 of the rotor 12 can move relative to each other in the axial direction.

The body portion 10a and the cam portion 10b of the inner cylinder 10 are accommodated in the rear end opening 2b of the barrel 2, and the threaded portion of the barrel 2 and the threaded portion 10e of the inner barrel 10 are screwed together. , an inner cylinder 10 is attached to the rear end of the barrel 2 .

The rear end portion of the refill member 4 is inserted into the annular holding portion 30 of the rotor 12 and abuts on the front surface of the annular portion 26 . Thereby, the refill member 4 is held by the rotor 12 so as to be able to be extended and retracted.

Also, the spring member 14 is arranged between the refill member 4 and the barrel 2 . The spring member 14 is sandwiched between the stepped portion 2d of the barrel 2 and the holding portion 30 of the rotor 12 in a contracted state. As a result, the rotor 12 is urged rearward by the spring member 14 .

In the retracting mechanism of the knock-type writing instrument of the present embodiment, the rotor 12 moves forward and rotates with respect to the inner cylinder 10 by pressing the knock member 16 against the biasing force of the spring member 14 . Thereby, the state in which the cam column 28 of the rotor 12 is accommodated in the notch 18 of the inner cylinder 10 and the state in which it is accommodated in the second notch 20 can be switched. As a result, a state in which the brush tip portion 4b of the refill member 4 held by the rotor 12 is accommodated in the barrel 2 and a state in which the brush tip portion 4b of the refill member 4 protrudes from the tip opening 2a of the barrel 2 are changed. You can switch.

7 shows a clip member of the retractable writing instrument shown in FIG. 1, (a) is a perspective view, (b) is a front view, and (c) is a side view. As shown in FIG. 7, the clip member 8 includes a connecting portion 8a and a body portion 8b axially extending forward from the connecting portion 8a. The connection portion 8a includes an axially extending base portion 8a1 and a tip portion 8a2 extending radially inward from the tip of the base portion 8a1. A notch portion 8c extending from the tip portion 8a2 to the base portion 8a1 is formed in the connection portion 8a. Further, side edge portions 8d projecting toward the center of the notch portion 8c are formed on both radially outer edges of the notch portion 8c in the base portion 8a1.

Next, a connection mechanism between the clip member 8 and the barrel 2 will be described.
When the threaded portion 10e of the inner cylinder 10 is threaded into the threaded portion 2c of the barrel 2, the protrusion 10d5 of the clip holding portion 10d enters the notch 2e of the barrel 2 and is locked. In this state, the base portion 10d3a of the first holding portion 10d3 of the inner cylinder 10 is inserted into the notch portion 8c of the clip member 8, and the holding portion 10d is fitted into the notch portion 8c. As a result, the side edge portion 8d of the clip member 8 is sandwiched between the body portion 10d2 and the widened portion 10d3b of the clip holding portion 10d. Further, as shown in FIG. 2(a), the distal end portion 8a2 of the clip member 8 is sandwiched between the connection portion 10d1 of the inner cylinder 10 and the shaft cylinder 2 from the front and rear. Thereby, the clip member 8 is fixedly connected to the barrel 2 .

The clip member 8 is previously attached to the inner cylinder 10 of the retractable mechanism 6 before attaching the retractable mechanism 6 to the barrel 2, and the threaded portion 10e of the inner cylinder 10 of the retractable mechanism 6 is attached to the barrel 2. The clip member 8 can be attached to the barrel 2 together with the protruding/retracting mechanism 6 by screwing it onto the threaded portion 2c. Conversely, the clip member 8 can be removed from the barrel 2 by removing the inner barrel 10 from the barrel 2 and removing the clip member 8 from the inner barrel 10 .

In this embodiment, the clip member 8 is provided with the cutout portion 8c, the inner cylinder 10 is provided with the first holding portion 10d3, and the first holding portion 10d3 is fitted into the cutout portion 8c. is fixed to the inner cylinder 10, but the present invention is not limited to this. You may fix by making a part fit in a notch part.

As described above, according to the present embodiment, the clip member 8 can be clipped by fitting the notch 8c of the clip member 8 into the first holding portion 10d3 formed in the clip holding portion 10d of the inner cylinder 10. can be detachably attached to the writing instrument body.
According to this embodiment having such a configuration, since no protrusion is formed on the outer peripheral portion of the rear end of the barrel 2, the outer surface of the barrel 2 can be easily processed such as printing.

<Second embodiment>
A writing instrument according to a second embodiment of the present invention will now be described. In addition, in this embodiment, the same code|symbol is attached|subjected about the structure similar to 1st Embodiment, and description is abbreviate|omitted.
FIG. 8 is a perspective view showing a writing instrument according to a second embodiment of the invention. 9A is a side view of the writing instrument shown in FIG. 8, and FIG. 9B is a cross-sectional view along the axial direction. As shown in FIGS. 8 and 9, the knock-type writing instrument 101 includes a cylindrical barrel 2, a refill member 4 accommodated in the barrel 2, and a retracting mechanism provided at the rear end of the barrel 2. 6 and a clip member 108 connected to the retractable mechanism 6 . The retractable mechanism 6 includes an inner cylinder 110 , a rotor 12 , a spring member 14 and a knock member 16 . In the present embodiment, no projecting portion is formed in the portion of the shaft tube 2 that contacts the connection mechanism for connecting the clip.

10 shows the inner cylinder of the knock-type writing instrument shown in FIG. 8, (a) is a perspective view, (b) is a front view, (c) is a cross-sectional view along the axial direction, and (d) is a bottom view. be. As shown in FIG. 10, the inner cylinder 110 includes a cylindrical main body portion 10a, a cam portion 10b extending from the main body portion 10a toward the front end side, and an annular rear end portion connected to the rear end side of the main body portion 10a. 10c and a clip holding portion 110d extending laterally from the rear end portion 10c. The body portion 10a, the cam portion 10b, the rear end portion 10c, and the clip holding portion 110d are integrally formed.

The clip holding portion 110d includes an arm portion 110d1 extending laterally from the rear end portion 10c of the inner cylinder 10, and a housing portion 110d2 connected to the tip of the arm portion 110d1. A through hole 110d3 having a rectangular cross section extending in the axial direction is formed in the housing portion 110d2. A pair of locking openings 110d4 communicating with the through holes 110d3 are formed on both lateral sides of the intermediate portion of the accommodating portion 110d2. A protruding portion 110d5 is formed on the surface of the arm portion 110d1 on the tip side (lower side in FIG. 10(b)).

11 shows a clip member of the retractable writing instrument shown in FIG. 8, (a) is a perspective view, (b) is a front view, and (c) is a side view. As shown in FIG. 11, the clip member 108 includes a body portion 108b and a pair of elastic arm portions 108a extending axially from ends of the body portion 108b. At least the elastic arm portion 108a of the clip member 108 is made of an elastically deformable resin material or the like. Each of the pair of elastic arm portions 108a has a locking portion 108a1 that widens laterally outward.

Next, a connection mechanism between the clip member 108 and the barrel 2 will be described.
When the threaded portion 10e of the inner cylinder 110 is threaded into the threaded portion 2c of the barrel 2, the projection 110d5 of the clip holding portion 110d enters the notch 2e of the barrel 2 and is locked. be. In this state, the clip member 108 is inserted into the through hole 110d3 of the housing portion 110d2 of the inner cylinder 110 with the pair of elastic arm portions 108a bent toward the center. As a result, the locking portions 108a1 of the pair of elastic arm portions 108a enter the locking openings 110d4 of the inner cylinder 110, respectively. As a result, the locking portions 108a1 of the pair of elastic arm portions 108a come into contact with the edges of the locking opening 110d4, preventing the clip member 108 from slipping out of the through hole 110d3 of the inner cylinder 110. As shown in FIG. Thereby, the clip member 108 is fixedly connected to the shaft tube 2 via the inner tube 110 . To remove the clip member 108 from the inner cylinder 110, the pair of elastic arm portions 108a are deflected toward the center from the locking opening 110d4, and the clip member 108 is pulled out from the through hole 110d3.

In this embodiment, the elastic arm portion 108a of the clip member 108 is inserted into the through hole 110d3 of the inner cylinder 110 from the front end side, but it may be inserted from the rear end side.

As described above, according to the present embodiment, by inserting the arm portion 108a of the clip member 108 into the through hole 110d3 and positioning the locking portion 108a1 in the locking opening 110d4 communicating with the through hole 110d3, A clip member 108 can be detachably attached to the body of the writing instrument.
According to this embodiment having such a configuration, since no protrusion is formed on the outer peripheral portion of the rear end of the barrel 2, the outer surface of the barrel 2 can be easily processed such as printing.

<Third Embodiment>
A writing instrument according to a third embodiment of the present invention will be described below. In addition, in this embodiment, the same code|symbol is attached|subjected about the structure similar to 1st Embodiment, and description is abbreviate|omitted.
FIG. 12 is a perspective view showing the rear end of the writing instrument according to the third embodiment of the invention. 13A is a side view of the writing instrument shown in FIG. 12, and FIG. 13B is a cross-sectional view along the axial direction. As shown in FIGS. 12 and 13, the knock-type writing instrument 201 includes a cylindrical barrel 2, a refill member 4 accommodated in the barrel 2, and a retracting mechanism provided at the rear end of the barrel 2. 6 and a clip member 208 connected to the retractable mechanism 6 . The retractable mechanism 6 includes an inner cylinder 210 , a rotor 12 , a spring member 14 and a knock member 16 . In this embodiment, a through hole 212 is formed in the center of the rotor 12, and a cylindrical portion 216 extending toward the tip is formed in the center of the knock member 16. Sixteen cylinders 216 are inserted. Further, in the present embodiment, no projecting portion is formed in the portion of the shaft tube 2 that is in contact with the connection mechanism for connecting the clip.

14 is a perspective view showing how the clip member of the writing instrument shown in FIG. 12 is attached and detached. FIG. 15(a) is a side view showing how the clip member of the writing instrument shown in FIG. 12 is attached and detached, and FIG. 15(b) is a cross-sectional view along the axial direction.
As shown in FIGS. 14 and 15, the inner cylinder 210 includes a cylindrical main body portion 210a, a cam portion 10b extending from the main body portion 210a to the front end side, and an annular cam portion connected to the rear end side of the main body portion 210a. It has a rear end portion 210c and a clip holding portion 210d extending laterally from the rear end portion 210c. The body portion 10a, the cam portion 10b, the rear end portion 210c, and the clip holding portion 210d are integrally formed.

The main body portion 210a is cylindrical, and the outer diameter of the main body portion 210a is substantially equal to the inner diameter of the shaft tube 2. As shown in FIG. A threaded portion 10e is formed on the outer peripheral surface of the body portion 210a. Axial protrusions (not shown) extending in the axial direction are formed on the inner peripheral surface of the body portion 210a at opposing positions at angular intervals of 180 degrees. A notch portion 210a1 is formed at the rear end portion of the body portion 210a on the side to which the clip member 208 is attached.

An axially extending opening 210d1 is formed in the clip holding portion 210d. The opening 210d1 of the clip holding portion 210d is continuous with the notch 210a1 of the body portion 210a, and the width of the opening 210d1 is equal to the width of the notch 210a1. A surface on the rear end side (upper side in FIG. 15) of the clip holding portion 210d is inclined forward toward the outside.

The clip member 208 includes a main body portion 208a, a connecting portion 208c extending radially inward from the rear end portion of the main body portion 208a, and an insertion portion 208b connected to the radially inner side of the connecting portion 208c.

A body portion 208a of the clip member 208 is formed in a V shape, and an outer portion 208c3 of a connecting portion 208c is sandwiched and fixed to a notch in the upper end portion of the body portion 208a. The connection portion 208c has a radially inner arc portion 208c1, an intermediate portion 208c2 that continues radially outward from the arc portion 208c1, and an outer portion 208c3 that continues radially outward from the intermediate portion 208c2. The circular arc portion 208c1 has the same cross-sectional shape as the opening portion 210d1 of the inner cylinder 210. As shown in FIG. The front surface of the intermediate portion 208c2 slopes outward and forward. A thread 208b1 is formed on the radial outer surface of the insertion portion 208b. When the insertion portion 208b is arranged in the notch portion 210a1 of the inner cylinder 210, the thread 208b1 is spirally connected to the threaded portion 10e of the main body portion 210a.

Next, a connection mechanism between the clip member 208 and the barrel 2 will be described.
In order to attach the clip member 208 to the barrel 2, first, before attaching the inner barrel 210 to the barrel 2, the insertion portion 208b of the clip member 208 is inserted into the opening 210d1 of the clip holding portion 210d from the rear end side. Insert until the portion 208c1 fits into the opening 210d1. When the circular arc portion 208c1 is fitted into the opening portion 210d1, the thread 208b1 of the clip member 208 is spirally connected to the threaded portion 10e of the main body portion 210a. In addition, the front inclined surface of the clip holding portion 210d of the inner cylinder 210 and the rear inclined surface of the intermediate portion 208c2 of the clip member 208 are in contact with each other. In this state, the threaded portion 10e of the inner cylinder 210 and the threaded portion of the barrel 2 are screwed together to attach the inner barrel 210 to which the clip member 208 is attached to the rear end portion of the barrel 2. . As a result, the arc portion 208c1 and the insertion portion 208b of the clip member 208 are fitted into the opening portion 210d1 and the notch portion 210a1 of the inner cylinder 210, and lateral movement of the clip member 208 with respect to the inner cylinder 210 is restrained. Further, since the thread 208b1 of the clip member 208 engages with the threaded portion of the barrel 2, the axial movement of the clip member 208 is restrained. That is, the clip member 208 is attached to the barrel 2 via the inner barrel 210 .

To remove the clip member 208 from the barrel 2 , first, the inner barrel 210 is rotated with respect to the barrel 2 , and the inner barrel 210 to which the clip member 208 is attached is removed from the barrel 2 . Then, the insertion portion 208b of the clip member 208 is removed from the opening portion 210d1 of the inner cylinder 210. Then, as shown in FIG. Thereby, the clip member 208 can be removed from the barrel 2 .

According to the present invention configured as described above, the threaded portion 10e of the inner cylinder 210 is screwed into the threaded portion of the shaft cylinder 2 while the insertion portion 208b of the clip member 208 is disposed in the notch portion 210a1 of the inner cylinder 210. Accordingly, the clip member 208 can be detachably attached to the writing instrument main body.
According to this embodiment having such a configuration, since no protrusion is formed on the outer peripheral portion of the rear end of the barrel 2, the outer surface of the barrel 2 can be easily processed such as printing.

<Fourth Embodiment>
A writing instrument according to a fourth embodiment of the present invention will now be described. In addition, in this embodiment, the same code|symbol is attached|subjected about the structure similar to 1st Embodiment, and description is abbreviate|omitted.
FIG. 16 shows a writing instrument according to a fourth embodiment of the present invention, (a) being a side view and (b) being a sectional view along the axial direction. As shown in FIG. 16, the knock-type writing instrument 301 includes a cylindrical barrel 2, a refill member 4 accommodated in the barrel 2, a retracting mechanism 6 provided at the rear end of the barrel 302, and a clip member 308 connected to the retraction mechanism 6 . The retractable mechanism 6 includes an inner cylinder 310 , a rotor 12 , a spring member 14 and a knock member 16 .

17 is an enlarged perspective view of the rear end portion of the writing instrument shown in FIG. 16. FIG. Note that FIG. 17 shows a state in which the knock member and the clip member are removed, and the inner cylinder is rotated approximately 90 degrees with respect to the shaft cylinder. As shown in FIG. 17, the shaft cylinder 302 of the fourth embodiment differs from the shaft cylinder 2 of the first embodiment in that a through hole 302f that penetrates into the shaft cylinder 302 is formed at the rear end portion. . The through hole 302f is axially aligned with a notch 302e formed in the rear edge of the barrel 302. As shown in FIG. In the present embodiment, no projecting portion is formed in the portion of the shaft tube 302 that corresponds to the connection mechanism for connecting the clip.

The inner cylinder 310 includes a cylindrical main body portion 10a, a cam portion 10b extending from the main body portion 10a to the front end side, an annular rear end portion 10c connected to the rear end side of the main body portion 10a, and a rear end portion 10c. and a clip holding portion 310d extending laterally from the . The body portion 10a, the cam portion 10b, the rear end portion 10c, and the clip holding portion 310d are integrally formed.

The clip holding portion 310d has an arm portion 310d1 extending laterally from the rear end portion 10c of the inner cylinder 310, and a cover portion 310d2 connected to the tip of the arm portion 310d1 and extending axially forward. The cover portion 310d2 has an arc-shaped cross section concentric with the shaft tube 302 in a cross section perpendicular to the axial direction. The cover portion 310d2 has a length and width that can cover the through hole 302f of the shaft tube 302 with the inner tube 310 attached to the shaft tube 302. As shown in FIG. A protrusion (not shown) is formed on the tip side surface of the arm portion 310d1 as in the second embodiment.

18 shows a clip member of the retractable writing instrument shown in FIG. 16, (a) is a perspective view seen from the radially outer side, and (b) is a perspective view seen from the radially inner side. As shown in FIG. 18, the clip member 308 includes a body portion 308b, an intermediate portion 308c extending radially inwardly from the rear end of the body portion 308b, and a connecting portion 308a extending rearwardly from the intermediate portion 308c. The connection portion 308a has a thickness substantially equal to the distance between the outer peripheral surface of the shaft cylinder 302 and the cover portion 310d2 of the inner cylinder 310. As shown in FIG. The radially outer surface of the connecting portion 308a has an arcuate cross-sectional shape with the same curvature as the radially inner surface of the cover portion 310d2 of the inner cylinder 310. As shown in FIG. The radially inner surface of the connection portion 308 a has an arcuate cross-sectional shape with the same curvature as the radially outer surface of the outer peripheral surface of the shaft tube 302 . A protrusion 308a1 is formed on the radially inner surface of the connecting portion 308a. The projecting portion 308a1 is formed in a shape substantially equal to that of the through hole 302f formed in the barrel 302. As shown in FIG. The projection height of the protrusion 308 a 1 is equal to the thickness of the barrel 302 , and the inner surface of the protrusion 308 a 1 is formed to have an arcuate cross section with a diameter equal to the inner diameter of the barrel 302 . A thread 308a2 is formed on the inner surface of the projection 308a1.

Next, a connection mechanism between the clip member 308 and the barrel 302 will be described.
In order to connect the clip member 308 to the barrel 302, first, the inner barrel 310 is rotated with respect to the barrel 302 until the cover portion 310d2 of the inner barrel 310 does not cover the through hole 302f of the barrel 302. . Next, the protrusion 308 a 1 of the clip member 308 is fitted into the through hole 302 f of the shaft tube 302 so that the main body portion 308 b of the clip member 308 is along the side of the shaft tube 302 . When the protrusion 308a1 of the clip member 308 is fitted into the through hole 302f of the barrel 302, the thread 308a2 formed on the inner surface of the protrusion 308a1 is continuous with the thread formed on the inner surface of the rear end portion of the barrel 302. do. Next, the inner cylinder 310 is rotated with respect to the barrel 302 until the cover portion 310d2 of the inner barrel 310 covers the through hole 302f of the barrel 302 . As a result, the connecting portion 308a of the clip member 308 is covered with the cover portion 310d2 of the inner cylinder 310, and the projecting portion 308a1 of the clip member 308 cannot be separated from the through hole 302f of the shaft cylinder 302. This allows the clip member 308 to be connected to the barrel 302 .

To remove the clip member 308 from the barrel 302, the inner barrel 310 is rotated with respect to the barrel 302 until the cover portion 310d2 of the inner barrel 310 does not cover the through hole 302f of the barrel 302. Then, the protrusion 308 a 1 of the clip member 308 is removed from the through hole 302 f of the barrel 302 . This allows the clip member 308 to be removed from the barrel 302 .

Although the through hole 302f is formed in the barrel 302 in the present embodiment, the portion into which the protrusion 308a1 of the clip member 308 is fitted does not necessarily need to be penetrated, and may be formed as a groove.

According to the present embodiment, the projection 308a1 of the clip member 308 is fitted into the through hole 302f of the shaft tube 302, and the connecting portion 308a of the clip member 308 is covered with the cover portion 310d2 from the outside in the radial direction. , the clip member 308 can be detachably attached to the body of the writing instrument.
According to this embodiment having such a configuration, since no projection is formed on the outer peripheral portion of the rear end of the barrel 302, the outer surface of the barrel 302 can be easily processed such as printing.

<Fifth Embodiment>
A writing instrument according to a fifth embodiment of the present invention will now be described. In addition, in this embodiment, the same code|symbol is attached|subjected about the structure similar to 1st Embodiment, and description is abbreviate|omitted.
FIG. 19 is a perspective view showing the rear end of the writing instrument according to the fifth embodiment of the invention. 20(a) is a side view of the writing instrument shown in FIG. 19, and (b) is a sectional view along the axial direction. As shown in FIGS. 19 and 20, a knock-type writing instrument 401 includes a cylindrical barrel 2, a refill member 4 accommodated in the barrel 2, and a retracting mechanism provided at the rear end of the barrel 2. 6 and a clip member 408 connected to the retractable mechanism 6 . The retractable mechanism 6 includes an inner cylinder 410 , a rotor 12 , a spring member 14 and a knock member 16 . In the present embodiment, no projecting portion is formed in the portion of the shaft tube 2 that contacts the connection mechanism for connecting the clip.

21 shows the inner cylinder of the knock-type writing instrument shown in FIG. 19, (a) is a perspective view seen from the rear, (b) is a perspective view seen from the front, (c) is a side view, and (d) is a FIG. 4 is a cross-sectional view along the axial direction; As shown in FIG. 21, the inner cylinder 410 includes a cylindrical main body portion 10a, a cam portion 10b extending from the main body portion 10a to the front end side, and an annular rear end portion connected to the rear end side of the main body portion 10a. 10c and a clip holding portion 410d extending laterally from the rear end portion 10c. The body portion 10a, the cam portion 10b, the rear end portion 10c, and the clip holding portion 410d are integrally formed.

The clip holding portion 410d includes an arm portion 410d1 extending laterally from the rear end portion 10c of the inner cylinder 10, and a housing portion 410d2 connected to the tip of the arm portion 410d1. A through hole 410d3 having a rectangular cross section extending in the radial direction is formed in the housing portion 410d2. In addition, notch portions 410d4 are formed on both radially inner side edges of the through hole 410d3 in the accommodating portion 410d2.

22 shows a clip member of the retractable writing instrument shown in FIG. 19, (a) is a perspective view, (b) is a front view, and (c) is a side view. As shown in FIG. 22, the clip member 408 includes a body portion 408b, a pair of intermediate portions 408a extending axially from ends of the body portion 408b, and a connecting portion 408c connected to the rear of the intermediate portions 408a. . At least the connecting portion 408c of the clip member 408 is made of an elastically deformable resin material or the like.

The intermediate portions 408a extend axially rearward from both lateral sides of the body portion 408b. The connecting portion 408c is arranged radially inward and includes an arc portion 408c1 having an arc-shaped cross section, a pair of parallel portions 408c3 extending radially outward in parallel from both sides of the arc portion 408c1, and a pair of grips 408c2 extending outward. Rear end portions of the pair of intermediate portions 408a are connected to portions of the connection portion 408c radially inside the pair of grip portions 408c2.

The pair of parallel portions 408c3 has the same axial length as the through hole 410d3 of the inner cylinder 410. As shown in FIG. The pair of gripping portions 408c2 are connected to the parallel portion 408c3 in an inclined state so that the distance between them widens as they go radially outward (to the right in FIG. 22(c)). A pair of locking portions 408c4 projecting sideways are formed at both lateral edges of the circular arc portion 408c1. The interval between the outer surfaces of the parallel portion 408c3, that is, the interval between the lateral edges of the arc portion 408c1 is equal to the width of the through hole 410d3 of the housing portion 410d2 of the inner cylinder 410. As shown in FIG.

Next, a connection mechanism between the clip member 408 and the barrel 2 will be described.
In order to attach the clip member 408 to the barrel 2, the connecting portion 408c is pushed into the through hole 410d3 of the inner cylinder 410 from the arc portion 408c1 side. Since locking portions 408c4 are provided on both lateral edges of the circular arc portion 408c1, when the connecting portion 408c is pushed into the through hole 410d3, the connecting portion 408c bends so that the locking portions 408c4 approach each other. When the connecting portion 408c is pushed further, the locking portion 408c4 enters the notch portion 410d4, and the connecting portion 408c returns to its unbent state. As a result, the locking portion 408c4 is locked to the edge of the notch portion 410d4, so that the connection portion 408c is prevented from slipping out of the through hole 410d3. Also, in this state, the outer side surfaces of the pair of parallel portions 408c3 of the clip member 408 are in contact with both sides of the through hole 410d3 of the inner cylinder 410, and both ends of the parallel portions 408c3 in the axial direction penetrate the inner cylinder 410. It abuts on both axial edges of the hole 410d3. Therefore, the movement of the clip member 408 with respect to the inner cylinder 410 is restrained, and the clip member 408 can be attached to the shaft cylinder 2 .

In order to remove the clip member 408 from the barrel 2, the pair of gripping portions 408c2 of the clip member 408 are pinched from both sides. As a result, the connecting portion 408c is bent so that the pair of locking portions 408c4 come closer to each other. Then, the connecting portion 408c is separated from the through hole 410d3 of the inner cylinder 410 while the connecting portion 408c is bent in this way. Thereby, the clip member 408 can be removed from the barrel 2 .

According to this embodiment, the clip member 408 can be attached and detached by arranging the connection portion 408c of the clip member 408 in the through hole 410d3 of the inner cylinder 410 and locking the locking portion 408c4 to the edge of the through hole 410d3. can be attached to the body of the writing instrument.
According to this embodiment having such a configuration, since no protrusion is formed on the outer peripheral portion of the rear end of the barrel 2, the outer surface of the barrel 2 can be easily processed such as printing.

<Sixth embodiment>
A writing instrument according to a sixth embodiment of the present invention will now be described. In addition, in this embodiment, the same code|symbol is attached|subjected about the structure similar to 1st Embodiment, and description is abbreviate|omitted.
FIG. 23 is a perspective view showing an inner cylinder and a clip member of a writing instrument according to a sixth embodiment of the present invention; The knock-type writing instrument of this embodiment differs from that of the first embodiment only in the configuration of the inner cylinder and the clip member. and a clip member 508 connected to the retractable mechanism. The retractable mechanism includes an inner cylinder 510, a rotor, a spring member, and a knock member.

24 shows the inner cylinder of the writing instrument shown in FIG. 23, (a) is a front view, (b) is an axial sectional view, and (c) is a top view.
As shown in FIG. 24, the inner cylinder 510 includes a cylindrical main body portion 10a, a cam portion 10b extending from the main body portion 10a toward the front end side, and an annular rear end portion connected to the rear end side of the main body portion 10a. 10c and a clip holding portion 510d extending laterally from the rear end portion 10c. The body portion 10a, the cam portion 10b, the rear end portion 10c, and the clip holding portion 510d are integrally molded from an elastic material. The clip holding portion 510d is positioned on the side of the barrel when the inner barrel 510 is attached to the barrel.

The clip holding portion 510d has a substantially rectangular cross-sectional shape when viewed from the radially outer side, and the radially inner upper end portion is connected to the rear end portion 10c. A laterally extending through hole 510d1 is formed in the clip holding portion 510d. Engagement grooves 510d2, 510d3, and 510d4 that are continuous over the entire circumference are formed on the axial front surface, rear surface, and both side surfaces of the clip holding portion 510d. These fitting grooves 510d2, 510d3, 510d4 are located in a plane parallel to the axial direction. Fitting grooves 510d3 and 510d4 formed on both sides and the front surface of the clip holding portion 510d are formed to have arcuate cross-sectional surfaces. The central angle of the arc surfaces of the fitting grooves 510d3 and 510d4 is less than 180 degrees. A fitting groove 510d2 formed in the rear surface of the clip holding portion 510d has an arc-shaped cross section. The central angle of the circular arc surface of the fitting groove 510d2 is greater than 180 degrees.

25 shows the clip member of the writing instrument shown in FIG. 23, (a) is a perspective view, (b) is a bb cross-sectional view in (a), and (c) is a cc cross-sectional view in (a). . As shown in FIG. 25, the clip member 508 is flat and has a rectangular through hole 508a at one end. The shape of the through hole 508a is substantially the same as the shape of the clip holding portion 510d of the inner cylinder 510. As shown in FIG.

Edges 508a3 and 508a4 on both sides and the front (the left side in FIG. 25(b)) of the through hole 508a of the clip member 508 have an arcuate convex cross-sectional shape. The central angle of arcuate edges 508a3 and 508a4 of the through hole 508a is less than 180 degrees. A laterally extending connecting portion 508a1 is erected at the rear (right side in FIG. 25(b)) edge of the through hole 508a of the clip member 508. As shown in FIG. A columnar portion 508a2 is formed at the front end portion of the connecting portion 508a1.

Next, a connection mechanism between the clip member 508 and the barrel will be described.
To attach the clip member 508 to the barrel, first, the cylindrical portion 508 a 2 of the clip member 508 is fitted into the fitting groove 510 d 2 of the clip holding portion 510 d of the inner cylinder 510 . Then, the clip member 508 is rotated around the cylindrical portion 508a2 until the clip member 508 becomes parallel to the shaft cylinder. As a result, both sides and front edges 508 a 3 and 508 a 4 of the through hole 508 a of the clip member 508 fit into the clip holding portions 510 d 3 and 510 d 4 of the inner cylinder 510 . Thereby, the clip member 508 is attached to the barrel via the inner barrel 510 .

Further, in order to remove the clip member 508 from the barrel, the clip member 508 is rotated around the cylindrical portion 508a2 in a direction in which the front of the clip member 508 is separated from the barrel. As a result, both sides and the front edges 508a3 and 508a4 of the through hole 508a of the clip member 508 are separated from the clip holding portions 510d3 and 510d4 of the inner cylinder 510. As shown in FIG. Then, the cylindrical portion 508a2 of the clip member 508 is pulled out from the fitting groove 510d2 of the clip holding portion 510d of the inner cylinder 510. As shown in FIG. This allows the clip member 508 to be removed from the barrel.

According to the present embodiment, the clip member 508 can be detachably attached by fitting the edges 508a3 and 508a2 of the through hole 508a of the clip member 508 into the fitting grooves 510d2, 510d3 and 510d4 of the clip holding portion 510d. It can be attached to the body of the writing instrument.
According to this embodiment having such a configuration, since no projection is formed on the outer peripheral portion of the rear end of the barrel, the outer surface of the barrel can be easily processed such as printing.

<Seventh embodiment>
A writing instrument according to a seventh embodiment of the present invention will now be described. In addition, in this embodiment, the same code|symbol is attached|subjected about the structure similar to 1st Embodiment, and description is abbreviate|omitted.
FIG. 26 is a perspective view showing an inner cylinder and a clip member of a writing instrument according to a seventh embodiment of the present invention; 27A and 27B show an inner cylinder and a clip member of a writing instrument according to a seventh embodiment of the present invention, where (a) is a front view and (b) is an axial cross-sectional view. As shown in FIGS. 26 and 27, the knock-type writing instrument of this embodiment differs from that of the first embodiment only in the configuration of the inner cylinder and the clip member. a retractable mechanism provided at the rear end of the barrel, and a clip member 608 connected to the retractable mechanism. The retractable mechanism includes an inner cylinder 610, a rotor, a spring member, and a knock member.

28 shows the inner cylinder of the writing instrument shown in FIG. 26, (a) is a perspective view, and (b) is a front view. As shown in FIG. 28, the inner cylinder 610 includes a cylindrical main body portion 10a, a cam portion 10b extending from the main body portion 10a toward the front end side, and an annular rear end portion connected to the rear end side of the main body portion 10a. 10c and a clip holding portion 610d extending laterally from the rear end portion 10c. The body portion 10a, the cam portion 10b, the rear end portion 10c, and the clip holding portion 610d are integrally formed. The clip holding portion 610d is connected to the side of the rear end portion 10c.

The clip holding portion 610d has a connecting portion 610d1 extending radially outward and a threaded portion 610d2 extending radially outward from the radially outer end surface of the connecting portion 610d1. The connecting portion 610d1 is cylindrical. A projecting portion 610d3 is formed on the front portion of the peripheral surface of the connecting portion 610d1. The threaded portion 610d2 has a cylindrical shape with a diameter smaller than that of the connecting portion 610d1. A thread 610d4 is formed on the peripheral surface of the threaded portion 610d2.

29 shows a clip member of the writing instrument shown in FIG. 26, (a) is a perspective view, and (b) is a sectional view. As shown in FIG. 29, the clip member 608 has a flat plate shape, and a circular through hole 608a for attachment to the inner cylinder 610 is formed at one end. The through hole 608a has substantially the same diameter as the threaded portion 610d2 of the inner cylinder 610, and a thread groove 608a1 is formed on the inner peripheral surface thereof. A protruding portion 608b is formed near the front side (right side in FIG. 29(b)) of the through hole 608a on the axially inner side (lower side in FIG. 29(b)) of the clip member 608. .

Next, a connection mechanism between the clip member 608 and the barrel will be described.
In order to attach the clip member 608 to the shaft cylinder, first, the through hole 608a of the clip member 608 is arranged coaxially with the threaded portion 610d2 of the inner cylinder 610, and the projection of the clip member 608 is rotated while rotating the clip member 608. The threaded portion 610d2 is inserted into the through hole 608a until the protruding portion 610d3 of the inner cylinder 610 contacts the threaded portion 608b. As a result, the thread 610d4 of the threaded portion 610d2 of the inner cylinder 610 and the thread groove 608a1 of the clip member 608 are screwed together. In this way, the clip member 608 can be attached to the barrel via the inner barrel 610 . To remove the clip member 608 from the barrel, the clip member 608 is rotated with respect to the inner barrel 610 . As a result, the thread 610d4 of the threaded portion 610d2 of the inner cylinder 610 and the thread groove 608a1 of the clip member 608 are disengaged, and the clip member 608 can be removed from the barrel.

According to this embodiment, the clip member 608 is detachably attached to the main body of the writing instrument by screwing together the thread 608a1 of the through hole 608a of the clip member 608 and the thread 610d2 of the connecting portion 610d1 of the inner cylinder 610. be able to.
According to this embodiment having such a configuration, since no projection is formed on the outer peripheral portion of the rear end of the barrel, the outer surface of the barrel can be easily processed such as printing.

1 Knock-type writing instrument 2 Axle tube 2a Tip opening 2b Rear end opening 2c Threaded portion 2d Stepped portion 2e Notch portion 2f Through hole 4 Refill member 4b Brush tip portion 6 Retractable mechanism 8 Clip member 8a Connection portion 8a1 Base portion 8a2 Tip portion 8b Body portion 8c Notch 8d Side edge 10 Inner cylinder 10a Main body 10b Cam 10c Rear end 10d Clip holding part 10d1 Connecting part 10d2 Main body 10d3 Holding part 10d3a Base 10d3b Widened part 10d4 Holding part 10d5 Protruding part 10e Threaded part 10f Shaft Directional protrusion 12 Rotor 14 Spring member 16 Knock member 18 Notch 18a Axial groove 18b Guide part 20 Notch 21 Base 22 Main body 22a Reduced diameter part 24 Rear end 24a Cylindrical part 24b Conical truncated part 24c Indicator 26 Circle Ring portion 26a Cam protrusion 28 Cam column 30 Holding portion 32 Front portion 32a Axial groove portion 32b Projection portion 34 Intermediate portion 34b Locking portion 36 Rear portion 101 Retractable writing instrument 108 Clip member 108a Elastic arm portion 108a1 Locking portion 108b Body portion 110 Inner cylinder 110d Clip holding portion 110d1 Arm portion 110d2 Accommodating portion 110d3 Through hole 110d4 Locking opening 110d5 Protruding portion 201 Retractable writing instrument 201d1 Opening portion 208 Clip member 208a Body portion 208b Insert portion 208b1 Thread 208c Connecting portion 208c1 Arc portion 208c2 Intermediate portion 208c3 Outer portion 210 Inner cylinder 210a Body portion 210a1 Notch 210c Rear end portion 210d Clip holding portion 210d1 Opening 212 Cylindrical portion 216 Through hole 301 Retractable writing instrument 302 Axle cylinder 302e Notch 302f Through hole 308 Clip member 308a Connecting portion 308a1 Protruding portion 308a2 Thread 308b Body portion 308c Intermediate portion 310 Inner cylinder 310d Clip holding portion 310d1 Arm portion 310d2 Cover portion 401 Retractable writing instrument 408 Clip member 408a Intermediate portion 408b Body portion 408c Connecting portion 408c1 Arc portion 408c2 Grip portion 408c3 Parallel portion 408c4 Locking portion 410 Inner cylinder 410d Clip holding portion 410d1 Arm portion 410d2 Accommodating portion 410d3 Through hole 410d4 Notch portion 508 Clip member 508a Through hole 508a1 Connecting portion 508a2 Cylindrical portion 508a3 Rim 510 Inner cylinder 510d Clip holding portion 510d1 Through holes 510d2, 510d3, 510d4 Fitting groove 608 Clip member 608a Through hole 608a1 Threaded groove 608b Projection 610 Inner cylinder 610d Clip holding portion 610d1 Connection portion 610d2 Threaded portion 610d3 Protrusion 610d4 Thread

Claims (3)

A writing instrument having a writing instrument body including a barrel and a detachable clip member located on the side of the writing instrument body,
A connection mechanism for connecting the clip member to the writing instrument body,
A projecting portion that projects radially outward is not formed in a portion of the shaft cylinder that contacts the connection mechanism, and
Further comprising an inner cylinder attached to the rear end opening of the barrel,
A thread is formed on the inner peripheral surface of the rear end of the barrel,
The inner cylinder has a main body portion with a thread formed on the outer peripheral surface,
The body portion of the inner cylinder is formed with a notch portion extending from the rear edge,
The clip member has an insertion portion having substantially the same shape as the cutout portion and having a thread formed on the radially outer surface thereof,
The writing instrument according to claim 1, wherein the clip member is attached to the barrel by screwing the threads of the inner cylinder into the threads of the barrel with the insertion portion disposed in the notch. A writing instrument having a writing instrument body including a barrel and a detachable clip member located on the side of the writing instrument body,
A connection mechanism for connecting the clip member to the writing instrument body,
A projecting portion that projects radially outward is not formed in a portion of the shaft cylinder that contacts the connection mechanism, and
Further comprising an inner cylinder rotatably attached to the rear end opening of the shaft cylinder,
The inner cylinder has a cover portion extending along the shaft cylinder,
A groove or an opening is formed in the shaft cylinder,
The clip member has a connecting portion having a protrusion formed on its radial inner surface in a shape substantially the same as the groove or opening formed in the barrel,
With the protrusion of the clip member fitted in the groove or opening of the shaft cylinder, the cover portion covers the connecting portion of the clip member from the outside in the radial direction. A writing instrument attached to a barrel. A writing instrument having a writing instrument body including a barrel and a detachable clip member located on the side of the writing instrument body,
A connection mechanism for connecting the clip member to the writing instrument body,
A projecting portion that projects radially outward is not formed in a portion of the shaft cylinder that contacts the connection mechanism, and
Further comprising an inner cylinder attached to the rear end opening of the barrel,
The inner cylinder has a clip holding portion located on the side of the shaft cylinder,
The clip holding portion has an arc-shaped fitting groove formed along the entire circumference of the clip holding portion in a plane parallel to the axis of the barrel,
The clip member has a through hole,
The clip member is held by the clip holding portion by fitting the edge of the through hole of the clip member into the fitting groove of the clip holding portion,
The central angle of the circular arc surface of the fitting groove formed on both sides and the front surface of the clip holding part is less than 180 degrees, and the central angle of the circular arc surface of the fitting groove formed on the rear surface of the clip holding part is 180 degrees. A writing instrument that is larger than a degree.

Images