JP2566095Y2 - Double writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-type writing instrument in which the tips of a plurality of writing bodies are made to be able to come and go alternately at a tip end of a front shaft and an eraser is made to come and go from the rear end of a cap.

[0002]

2. Description of the Related Art Conventionally, as an example of a double-type writing instrument, as shown in Japanese Utility Model Laid-Open No. 64-3491 by the same applicant, a sliding groove for guiding two writing bodies is provided on a front shaft. The front end has a guide cylinder fixedly attached thereto and a cam slope contacting a sliding piece attached to two writing bodies fitted to the guide cylinder, and the rear end has no knocking portion. movably in the axial direction relative to the cap Te, and rotation in the circumferential direction comprises a cylindrical cam mounted so as to be integral, at the two cursive by rotational operation of the cap with respect to front barrel to front barrel tip opening There are multiple writing instruments that can selectively appear and disappear.
In addition, as a cited example of the present application, Japanese Utility Model Application No.
As described in JP-A-120889, there is a double-type writing instrument in which a crown protruding from a rear end of a cap is rotated to make an eraser appear and disappear.

[0003]

In the above cited example, since the crown protruding from the rear end of the cap is short, it is difficult to pick with a finger, and it is difficult to operate the eraser. In addition, when using a writing instrument, it is necessary to immerse the eraser from the rear end in order to contaminate the finger and the eraser with a knock or the like. Further, since the eraser is exposed, there is a problem of adhesion of dust and deterioration of the eraser. Further, there is a bad appearance due to the exposed eraser. The present invention is to solve the above problem.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a double writing instrument according to the present invention is provided with an engaging portion for fitting the leading end of a front shaft and a guide tube in a non-rotatable and non-removable state. And fixed both. Cam also a plurality of writing bodies were fastened to sliding pieces at the rear end a plurality of guide grooves provided in the guide tube is fitted freely respectively move back and forth through the return spring, also cylindrical cam is displaced in the axial direction A slope is provided circumferentially at the front end, and a flange is projected from the inner surface.
Bar and is fitted to the circumferential groove provided in the guide tube the rear end outer periphery and retained and freely rotates the cylindrical cam relative to the guide tube, and the center shaft in a state covering the gas <br/> Id cylinder and the cylindrical cam Attached to the rear of the guide cylinder, the guide cylinder cannot be rotated with respect to the central shaft and cannot be removed, and the cylindrical cam can be selectively rotated with respect to the central shaft. In addition , a long cylinder part is provided behind the cylindrical cam, and the cylinder part is projected from the rear end of the center shaft.A slit is provided in the cylinder part, and an eraser holder with an eraser fastened to the rear has its projection in the slit. while being fitted into the cylindrical portion in a state of being fitted, the inner diameter portion of the shaft after the helical groove is provided rotatably a retaining fastened to the cylindrical portion of the cylindrical cam, the rubber holder off the spiral groove of the rear axle The projection was fitted. In addition, a lid that constantly covers the opening is provided rotatably at the rear end of the cap, and the cap is fitted around the rear shaft outer periphery so that only the shaft transition is possible,
A lock device is provided between the rear shaft and the cap to prevent the shaft from shifting. Also , when the cap is positioned behind the rear shaft and locked, the cylindrical cam is rotatable with respect to the center shaft,
The cap is prevented from rotating, and by rotating the cap to the left or right with respect to the front shaft or the center shaft, the tip of the cursive writing is selectively protruded from the front end of the front shaft. Further, when the cap is positioned at the front with respect to the rear shaft and locked, the cover is expanded and the eraser is exposed from the opening, and at this time, the cylindrical cam is prevented from rotating with respect to the center shaft , and the cap is prevented. , And the eraser is protruded and retracted from the rear shaft by rotating the cap left and right with respect to the front shaft or the center shaft. Also, among the plurality of cursive less when
If one of the pencil pencils is a pencil pencil, the tip of the pencil pencil protrudes from the front end of the front shaft, and the circumferential groove portion of the guide cylinder facing the flange of the cylindrical cam is widened. The shaft is free to move within the range where the cylindrical cam extends the core with respect to the cylinder. Necessary for centering between the rear end of the center shaft and the tip of the clutch interposed at the end of the rear shaft.
A gap is provided for the knock stroke.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The compound writing instrument of the present invention includes a guide cylinder 1, a front shaft 2, a cylindrical cam 3, a center shaft 4, a pair of sliding pieces 5, 5 ｀, a pencil pencil writing body 6, a writing body 7, such as a ballpoint pen, a cap 37, and a lid 4.
4. Locking device 47, rear shaft 52, clutch 61, eraser
The main component is a memory holder 71 and an eraser 73.
First, the guide cylinder 1 is made of resin, and has an axially long guide groove 8 which is opened from the center to the rear end as shown in FIGS. Axially extending guide groove 8 ｀ which is open from the part to the front end of the rear end
have. In the front half of the guide tube 1, each guide groove 8,
A cylindrical portion 9 having a partition portion 15 having holes 36 and 36 ° in communication with 8 ° and having an open front end is provided, and a flange portion 29 is formed on an outer peripheral portion near the rear end of the cylindrical portion 9. Further, a bulging engagement portion 12 is formed on the outer peripheral portion in front of the flange portion 29. Further, the side surface slightly behind the rear end of the cylindrical portion 9 is formed in a circumferential shape (to be described as an example) to be fitted in an engagement groove 27 of the center shaft 4 described later.
(In several places), bulging engagement portions 28 are formed.
A circumferential groove 16 is provided on the side surface of the rear end of the guide cylinder in the circumferential direction.

The front end of the tip shaft 2 is tapered, and has an inner step 24 at the tip of the inner hole. In the rear end hole, an engagement groove 11 is provided which engages with an engagement portion 12 provided on the outer peripheral portion of the cylindrical portion 9 of the guide cylinder and prevents the guide cylinder 1 from coming off and from rotating. . The cylindrical portion 9 and the front shaft 2 are detachably fixed by an appropriate force. (The actual opening 64
The structure is basically the same as that of
You. )

As shown in FIG . 10 and FIG.
Is made of resin, has a cylindrical shape, has a cam slope 13 displaced circumferentially back and forth at a front end edge, and a notch 14 is formed at the foremost end of the cam slope 13. A key groove 32 is formed on the rear side of the cam slope 13 so that a clutch 61 to be described later is prevented from rotating and slidably engaged by appropriate frictional engagement, and a fan-shaped flange is formed on the inner surface of the cylindrical cam 3. 17 are provided. Also, long slits 34 are formed at two locations on the side surface of the cylindrical portion 3a extending long behind.

The center shaft 4 has an engaging groove 27 on the inner surface of the front end for stopping the rotation of the rear portion of the guide cylinder 1 and preventing it from coming off. The rear end of the shaft 4 has a clutch, as shown in FIG. Inclined surface 3 fitted with ribs 66 of 61 to prevent rotation of each other
5 are provided at a plurality of locations.

As shown in FIG . 12 and FIG.
Has a protrusion 19 on the outer surface, a central portion protruding from the rear end surface of the protrusion 19, and both sides thereof have a cam slope having substantially the same slope as the cam slope 13 of the cylindrical cam 3 described above. In addition, a hole is provided which abuts against the flange portion 21 of the core pipe 20 to protrude and fit the rear of the core pipe 20 long. Also, figure
As shown in FIG. 14, the sliding piece 5 # has a projection 19 # and a cam slope similarly to the sliding piece 5, and a locking portion 23 for fastening the rear end of the writing body 7 such as a ball-point pen is provided at the tip. ing.
Note that the locking portion 23 can be formed in a pipe shape and the rear end of the writing body can be fitted.

[0010] The rear shaft 52 is made of resin and has an outer peripheral portion in the axial direction 2.
Locking grooves 55 and 56 are provided at the locations. A spiral groove 53 is formed on the inner surface. Further, the inner surface of the tip is engaged with an engagement groove 33 provided in the cylindrical portion of the cylindrical cam 3,
A protruding engaging portion 78 that is rotatable with respect to the cylindrical cam 3 and that prevents the cylindrical cam 3 from coming off is formed.

The eraser holder 71 has a bottomed hole at the rear end for fixing the rear end of the eraser 73, the outer periphery of the front end is fitted into the slit 34 of the cylindrical cam 3, and the rear shaft 52 A projection 72 that fits into the spiral groove 53 is provided at an appropriate position.

The mechanical pencil 6 has a built-in general chuck mechanism, is joined to the core pipe 20 via a joint 30 connected to the chuck mechanism at the rear end, and has a flange portion 21 provided at the rear of the core pipe 20. The sliding piece 5 is fitted in contact with the sliding piece 5, and the rear end hole of the core pipe 20 protruding from the rear end of the sliding piece 5 is closed by a tail plug 22 or the like. The leading end of the mechanical pencil 6 is drawn by the tip 2
This is performed by sliding the chuck by the axial movement of the sliding piece 5 in a state in contact with the inner step portion 24 of FIG.

The cap 37 urges a spring 46 between the cap 37 and the lid 44 on a base 41 provided at the rear end on the outer periphery near the opening 40, so that the lid 37 is 41 is attached rotatably, and
Is configured to always shield the opening 40.
A clip 42 is fixed to the base 41. The cap 37 is fitted on the outer peripheral portion of the rear shaft 52 so as to be able to move in the axial direction, but faces the locking grooves 55 and 56 of the rear shaft 52 so as to face the base portion 4.
A lock device 47 having a protruding locking portion 48 at the front end and a button 50 at the rear end is attached to 1 at an intermediate fastening portion 49 so as to be appropriately rotated via a pin or the like. Locking device 4
7 is fitted in a window 77 provided in front of the base 41 of the cap 37, and its button 50 appropriately protrudes from the window 43 pierced on the upper surface of the clip 42, and a seat 74 of the base 41.
A spring 51 is urged between the button 50 and the lower part of the button 50, and when the button 50 is pressed, the locking portion 48 moves up and down. As shown in FIG. 7, a rib 38 having an inclined surface 69 at the rear end is formed at a plurality of places in a forward hole of the cap 37, and a groove 70 is provided between the ribs. ing. A decoration ring 39 is fixed to the tip of the cap 37 with an appropriate gap around the outer periphery of the center shaft 4.

The clutch 61 is, as shown in FIG.
A rib 63 having a flange portion 62 at a rear end, a rib 63 having an inclined surface 65 at a front end is formed at a plurality of locations on a front outer periphery, and a groove 64 is provided between the ribs. Is provided with a plurality of ribs 66 each having an inclined surface 67. Further, the shaft center has a hole provided with a key 68.

A writing body 7 such as a mechanical pencil 6 and a ballpoint pen is connected to respective sliding pieces 5 and 5 に at the rear end so as to be movable in the respective guide grooves 8 and 8 ｀ of the guide cylinder 1 described above. It is fitted and is urged rearward by return springs 26, 26 # interposed between the front end surfaces of the sliding pieces 5, 5 # and the guide grooves 8, 8 # of the guide tube 1 and the partition 15 on the front surface. You. The cylindrical cam 3 is elastically fitted with a collar 17 in the circumferential groove 16 of the guide cylinder 1 and is rotatably and circumferentially rotatable with respect to the guide cylinder 1 so as to be fixed. Normally, the circumferential groove 16 and the brim 17 are dimensioned so that the cylindrical cam 3 is prevented from rotating while each writing body projects from the tip end of the front shaft.
Also, with the mechanical pencil protruding,
The circumferential groove position facing 7 is formed wider by the stroke required for center feeding. Further, since the sliding pieces 5, 5 # are urged rearward by the return springs 26, 26 #, the cam slopes of the projections 19, 19 # always keep the cam slope 13 of the cylindrical cam 3 in contact. ing.

Next, description will be made in accordance with the assembling order of each part.
First, the center shaft 4 is attached by fitting the guide tube 1 and the cylindrical cam 3, the rear surface of the flange portion 29 of the guide tube 1 is in contact with the front surface of the center shaft 4, and the engaging portion 28 is engaged with the center shaft 4. The guide cylinder 1 is elastically fitted in the groove 27 so that the guide cylinder 1 cannot rotate with respect to the center shaft 4, and the cylindrical cam 3 can rotate with respect to the center shaft 4 and can freely move with respect to the shaft. The front shaft 2 is fitted in the tube portion 9 of the guide tube 1, and the rear end surface of the front shaft 2 is in contact with the front surface of the flange portion 29. The front shaft 2 and the guide cylinder 1 are elastically fitted in the engagement grooves 11 and are fixed in a state where they are prevented from rotating and come off. The tip shaft 2 is detachable with an appropriate force. In this state,
When the center shaft 4 rotates in one direction with respect to the front shaft 2, the sliding piece 5
Is notched 1 at the forefront end of the cam slope 13 of the cylindrical cam 3
4 is engaged with the projection 19 of the sliding piece 5 of the mechanical pencil writing body 6, and the writing tip projects from the tip end of the front shaft. When the center shaft 4 is rotated in the other direction with respect to the front shaft 2, the sliding piece 5 retreats, the writing tip of the mechanical pencil writing body 6 is immersed from the front shaft tip opening, and the sliding piece 5 # is advanced. The writing tip of the writing body 7 such as the other ballpoint pen projects from the tip end of the front shaft.

On the other hand, in the cylindrical portion of the cylindrical cam 3 protruding from the rear end of the central shaft 4, a clutch 61 is fitted in the key groove 32, corresponding to the rib 66 in the groove 31 at the rear end of the central shaft 4. In the clutch 61, the key 68 is fitted into the key groove 32,
The mutual rotation is stopped, and the mutual frictional engagement is appropriately performed, and the clutch 61 slides in the axial direction. The position of the guide cylinder 1 and the groove 31 of the center shaft in the circumferential direction, the position of the cam slope 13 of the cylindrical cam and the rib 66 of the clutch in the circumferential direction,
The circumferential positional relationship between the flange 17 of the cylindrical cam and the peripheral groove 16 of the guide cylinder is such that the cylindrical cam 3 rotates and the rib 66 of the clutch moves with respect to each of the projected and retracted positions of the writing body. It is set so as to conform to the groove 31 of the center shaft.

An eraser holder 71 is elastically fitted in the cylindrical portion of the cylindrical cam 3, and a projection 72 of the eraser holder 71 is fitted in a slit 34 provided in the cylindrical portion of the cylindrical cam 3 to erase the rubber. The holder 71 is rotatable and slidable on the cylindrical portion of the cylindrical cam 3. Further, the rear shaft 52 is elastically fitted to the cylindrical portion of the cylindrical cam 3 so as to be rotatably fixed to the cylindrical portion, and the projection 72 of the eraser holder 71 is fitted to the rear shaft 52. Into the spiral groove 53. The front end of the rear shaft 52 is connected to the flange 6 of the clutch 61.
2 is in a substantially abutting state. Also, a crown 54 having an opening at the rear end is fixed to the rear end of the cylindrical portion of the cylindrical cam 3 in a state of being substantially in contact with the rear end of the rear shaft 52, and an eraser 73 is provided at the opening of the crown 54. And the rear end of the eraser 73 is fixed to the eraser holder 71. As described above, when the rear shaft 52 is rotated with respect to the cylindrical cam 3, the eraser 73 protrudes and retracts from the opening. The inner diameter of the opening of the crown 54 is the same as the eraser 7.
3 is provided slightly larger than the outside diameter.

The cap 37 is inserted from the front of the center shaft 4 so as to cover the rear shaft 52, the rib 38 on the inner surface of the cap fits into the groove 64 of the clutch 61, and the cap 37 and the clutch 61 stop rotating. And the axis can be freely shifted. still,
When the cap 37 is attached, the lid 44, the lock device 47,
Clip 42 is not attached to the cap.

By the way, the cylindrical body 57 has a cutout 76 and a protruding locking portion 58 on the outer peripheral side from the front, and a protruding end 59 on the rear end.
On the other side, and on the opposite side, a key (not shown) is provided on the inner surface. The cylinder 57 is provided with the cap 37.
Is inserted between the outer periphery of the rear shaft 52 and the inner periphery of the cap 37, the cutout window 76 faces the window portion 77 of the cap, and the locking portion 58 fits into the window portion 77. Base 4
The first seat 74 is locked to the front end of the seat 74, and the end 59 is in contact with the rear end of the seat 74. Further, the key is fitted into a groove 75 provided on the outer periphery of the rear shaft so as to be free to move, and thus, the cap 37 and the rear shaft 52 are stopped from rotating via the cylindrical body 57, and the shaft is freely moved. The tip of the cylindrical body 57 is
As opposed to the rear end of the flange portion 62 of the clutch 61. In this state, the lid portion 44, the lock device 47, the clip 42, and the like are attached to the cap 37, and the dual writing implement of the present invention is completed.

[0021]

First, from the state shown in FIG.
When the cap 37 is rotated in one direction, the rib 38 of the cap is fitted in the groove 64 of the clutch, so that the cylindrical cam 3 rotates in conjunction therewith. At that time, since there is no relative movement between the cylindrical cam 3 and the rear shaft 52, the eraser 73 is fixed. Therefore, the notch 14 provided at the tip of the cam slope 13 of the cylindrical cam with the rotation is provided with one of the mechanical pencils 6.
And the writing tip projects from the tip end of the front shaft. At this time, the flange 17 of the cylindrical cam 3 is
It is located in the wide part. In addition, the locking portion 48 of the locking device
Is engaged with the locking groove 55 of the rear shaft 52, so that the cap 37 and the cylindrical cam 3 are integrated in the axial direction. When the rear end of the lid 44 is knocked from this state, the cylindrical cam 3 is axially moved by the stroke of the gap formed between the tip of the groove 31 at the rear end of the center shaft 4 and the tip of the rib 66 of the clutch 61.
The operation is transmitted to the sliding piece 5, the core pipe 20, and the mechanical pencil 6, and the step 25 at the tip of the writing is moved to the front shaft 2.
From the state in which the chuck comes into contact with the inner step portion 24, the chuck is axially moved together with the joint 30, and the core is fed out. Next, when the center shaft 4 is rotated to the other side with respect to the front shaft 2, the mechanical pencil 6 is retracted, and the writing tip of the writing body 7 such as a ballpoint pen is projected from the front shaft front end.

Next, when the button 50 is pressed to release the engagement between the locking portion 48 of the locking device and the locking groove 55 of the rear shaft, and the cap 37 is moved forward, Corner is lid part 4
The lid is expanded while being in contact with the inner surface of the opening 4, and is exposed from the rear end of the opening 40. Further, the locking portion 48 of the locking device is engaged with the locking groove 56 of the rear shaft, and the cap 37 is fixed to the rear shaft 52. Further, the contact portion 60 of the cylindrical body 57 is
, And the clutch 61 is further advanced to fit the rib 66 into the groove 31 of the center shaft 4. The rib 38 of the cap is disengaged from the groove 64 of the clutch. (See FIG. 2) In this state, when the cap 37 is rotated in one direction with respect to the front shaft 2 or the center shaft 4, the cap and the cylindrical cam 3 are rotatable. The eraser holder 71 is gradually retracted as it moves along the spiral groove 53 of the rear shaft 52, and the eraser 73 is fed out from the opening of the crown 54. or,
When the cap 37 is rotated to the other side, the eraser holder 71 advances, and at the same time, the eraser 73 is immersed through the opening of the crown 54. At this time, the rotation of the cylindrical cam 3 is stopped by the center shaft 4, and the movement of the writing body is fixed.

[0023]

[Effect of the Invention] As described above, the present invention allows the eraser to appear and disappear by rotating the cap of an appropriate length with respect to the front shaft or the center shaft, so that it is easy to grasp with a finger, and the eraser is projected in an appropriate amount. Even if there is, it can be stored by moving the cap backward with respect to the center axis, without soiling your fingers and eraser,
Very easy to use. In addition, when not in use, the eraser is shielded by the lid, so that there is no adhesion of dust, and there is no deterioration of the eraser caused by exposing the eraser for a long time as in the prior art. Also, since the eraser is shielded, the appearance when carrying is improved. Although the eraser is mounted in the embodiment of the present invention, when a solid correcting agent used for correcting writing with a ballpoint pen is mounted, deterioration over time and adhesion of dust are more remarkable than the eraser. Therefore, the structure of the double writing instrument of the present invention exerts a further effect.

[Brief description of the drawings]

FIG. 1 is a perspective vertical sectional view of a main part showing an embodiment of the present invention, showing a stored state of an eraser.

FIG. 2 is a longitudinal sectional view of a main part in a state where a lid is opened, a cap is rotated, and an eraser is appropriately projected.

FIG. 3 is a front view in the state of FIG. 2;

FIG. 4 is a top view showing the appearance of the portable device, in which a cursive body and an eraser are stored.

FIG. 5 is a front view of the clutch used in the embodiment of the present invention.

FIG. 6 is a side view of the clutch.

FIG. 7 is an external view showing a main part of a rear end of a center shaft used in the embodiment of the present invention.

FIG. 8 is a cross-sectional view of a main part of a cap used in the embodiment of the present invention.

FIG. 9 It is a longitudinal cross-sectional view of a guide cylinder.

FIG. 10 It is a longitudinal section of a cylindrical cam.

FIG. 11 It is the side view seen from the front of a cylindrical cam.

FIG. It is sectional drawing of the sliding piece 5.

FIG. 13 FIG. 13 is a top view of FIG. 12.

FIG. 14 FIG. 5 is a front view of a sliding piece 5 #.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Guide cylinder 2 Front shaft 3 Cylindrical cam 3a Cylindrical part 3b Locking groove 4 Center shaft 5 Sliding piece 5 ｀ Sliding piece 6 Mechanical pencil, writing body 7 Ballpoint pen, etc. 8 Guide groove 8 ｀ Guide groove 9 Tube part 10 Knock spring DESCRIPTION OF SYMBOLS 11 Engagement groove 12 Engagement part 13 Cam slope 14 Notch 15 Partition part 16 Peripheral groove 17 Flange 18 Through hole 19 Projection 19 ｀ Projection 20 Core pipe 21 Flange part 22 Tail plug 23 Locking part 24 Inner step 25 Step 26 Return spring 26 ｀ Return spring 27 Engagement groove 28 Engagement part 29 Flange part 30 Joint 31 groove 32 Key groove 33 Engagement groove 34 Slit 35 Inclined surface 36 Hole 36 ｀ Hole 37 Cap 38 Rib 39 Decoration ring 40 Opening 41 Base 42 clip 43 window portion 44 lid portion 45 fastening portion 46 spring 47 locking device 48 locking portion 49 fastening part 50 button 51 spring 52 rear shaft 53 spiral groove 54 crown 55 locking groove 56 locking groove 57 cylinder 58 locking part 59 end part 60 contact part 61 clutch 62 flange part 63 rib 64 groove 65 inclination Surface 66 Rib 67 Inclined surface 68 Key 69 Inclined surface 70 Groove 71 Eraser holder 72 Projection 73 Eraser 74 Seat 75 Groove 76 Cut window 77 Window 78 Engagement

Claims (2)

(57) [Scope of request for utility model registration] An engaging portion for fitting the leading end of a front shaft and a guide cylinder in a non-rotatable and non-removable state is provided, and both are fixed, and sliding pieces are inserted into a plurality of guide grooves provided in the guide cylinder. A plurality of writing bodies fixed to the rear end are fitted between the guide cylinder and the sliding piece so as to be movable back and forth in the axial direction by urging a return spring, and the cylindrical cam is a cam displaced in the axial direction. A slope is provided circumferentially at the front end, and a collar is projected from the inner surface.
And a slit is provided in the cylinder part
Te becomes, the cylindrical cam, is fitted to the flange of the cylindrical cam in a circumferential groove provided in the guide tube the rear end outer periphery and fixed to the rotating and retaining state the cylindrical cam relative to the guide tube, and the guide tube of the back and cylindrical cam center shaft and fitted on is fixed to the non-rotatable and retaining state in the guide tube, the cylindrical cam relative to the center shaft is prevented from selectively rotated, also the cylinder projecting from the center pole of the rear end the tubular portion of the cam rear mounted projections eraser holder to fasten the eraser at the rear is provided on the outer periphery is fitted into the slit of the tubular portion, and the outer periphery of the cylindrical portion a spiral groove formed in the inner diameter portion axis secured of the state retaining a rotatable after
Then, the projection of the eraser holder is fitted into the spiral groove of the rear shaft, and a cap provided with a lid at the rear end for always closing the opening is fitted around the outer periphery of the rear shaft so that only the shaft can be shifted and the rear shaft is state and the locking device is provided to prevent axial transitions therebetween cap, the cap in a state releasing the locking device when is shifted to other party, the lid portion is exposed eraser from opening flares in the rotation prevention of the cylindrical cam relative to the center shaft
Becomes rotatable relative to the cap along with the, and eraser by rotating the cap to the left and right with respect to front barrel or center pole is made with retractable with cap <br/> flop is locked in the rear axle, also the cap When the cap is locked to the rear shaft with the lid closed and the cap is locked to the rear shaft, the cylindrical cam becomes rotatable with respect to the center shaft and is prevented from rotating with respect to the cap, and the cap is locked with respect to the front shaft or the center shaft. By rotating left and right, each sliding piece is alternately moved in the front-rear direction by rotation of the cylindrical cam with respect to the guide cylinder in a state where the rear end of each sliding piece is in contact with the cam slope of the cylindrical cam. A dual-purpose writing instrument characterized in that the tip of the cursive writing can be selectively made to protrude and retract from the tip end of the tip shaft. Wherein the plurality of cursive, the one at least as mechanical pencil cursive projecting tip of the mechanical pencil cursive from front barrel tip opening, in the state in which the cap is locked in the retracted position, The circumferential groove position of the guide cylinder facing the flange of the cylindrical cam is formed wide, the axis of the cylindrical cam can be freely shifted within the range in which the mechanical pencil is drawn out with respect to the guide cylinder, and the rear end and the rear end of the center shaft 2. The double type according to claim 1, wherein a gap corresponding to a knock stroke necessary for feeding the core is provided between the shaft and the tip of the shaft, and the rear shaft and the cap are configured to freely move with respect to the center shaft. Writing implement.