JP2006103015A - Double writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a convenient slider-type double writing utensil which has a rear barrel freely detachable from a forward barrel or an intermediate barrel and enables a lead to be easily replenished from the rear end, when the rear barrel is removed, and has an eraser feeder device, a writing element, a correction implement, a seal and the like mounted in the rear barrel. <P>SOLUTION: This double writing utensil is assembled of a lead pipe and mechanical pencil writing elements mounted forward of a slider to be guided in an axial direction, in each of longitudinal slit parts drilled in the side of the intermediate barrel. In addition, the slider is installed with a spring in the way that the former can move back and forth and the apex of each writing element can be selectively retracted from a barrel tip. Further, a lid part which can freely open/close a hole part opened in the lead pipe, and the lead can be replenished to the lead pipe in the state that the rear barrel is removed. Besides, an engagement cylinder is fitted to the rear end of the intermediate barrel in the way that the former can move forward/backward and the rear end of the slider is engaged with the forward end of an engagement bar installed extending at the forward end of the engagement cylinder during the advance of the slider and consequently, the writing tip is fixed protruding from the barrel tip. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is equipped with a plurality of mechanical pencil writing bodies, the writing tip portion can be alternately projected and retracted at the tip end of the shaft tip, the rear shaft can be knocked and the lead can be extended, and the rear shaft can be extended. The present invention relates to the provision of a compound writing instrument that is detachable from the shaft tip and that can easily be refilled from the rear end when the rear shaft is removed.

Reality 1-28333 JP-A-9-156288 JP-A-9-58183 In Japanese Patent Laid-Open No. 9-58184 (Patent Document 1), a mechanical pencil and a ballpoint pen each having a sliding piece fixed thereto are slidably fitted in axial grooves provided in a guide cylinder for fixing to a tip shaft, respectively. A cylindrical cam provided with a cam inclined surface on the outer periphery of the cylinder is mounted so as to be rotatable and axially movable with respect to the guide cylinder, and the cap and the cylindrical cam are rotated at the inner diameter of the cap (rear shaft). When the cap, that is, the cylindrical cam is rotated by bringing the cam slope of the cylindrical cam into contact with the sliding piece, the sliding piece is moved on the cam slope, and the core pipe of the mechanical pencil Open the rear end and project backward longer than the sliding frame, and provide a hole slightly larger than the outer diameter of the core pipe at the rear position of the groove where the mechanical pencil is fitted in the rear part of the guide cylinder. By inserting the rear end of the core pipe into the hole, the rear end of the core pipe can be slid within the hole when the sliding piece moves back and forth, and a funnel is provided at the rear end of the guide tube. The part shows a double writing instrument in which a large-diameter portion that accommodates an eraser and a small-diameter portion that communicates with the hole portion beside the large-diameter portion. (Patent Document 2) includes a front shaft and a middle shaft that are fixed to each other in a non-rotatable and retaining state, and a writing body that is integrated with the middle shaft in a plurality of guide grooves. A return spring is urged between them to fit back and forth freely, and a cylindrical cam with a cam slope that is displaced in the axial direction is provided around the front end to prevent it from coming off so that it can rotate with respect to the guide or center shaft. The front writing part that allows the front end of each writing body to be selectively projected and retracted from the front end of the front shaft by alternately moving back and forth by rotating the cylindrical cam with respect to the central shaft by bringing each sliding piece into contact with the cam slope. And a double writing instrument in which an eraser can be projected and retracted at the rear part, a rear shaft is detachably and integrally fixed to the rear of the cylindrical cam, and an eraser is inserted into the rear inner hole of the rear shaft from the rear end. There is an eraser feeding device that can appear and disappear. , At least one of the cursives is a mechanical pencil cursive, and the cylindrical cam can move with respect to the central shaft, allowing the lead to be fed out. A dual writing instrument configured to be refillable is shown. (Patent Document 3) includes a front shaft that is detachably fixed to the front of the middle shaft, and at least one front of a slider that is guided in the axial direction in each of the longitudinal slit portions formed at a plurality of locations on the side surface of the middle shaft. A plurality of cursive bodies with a mechanical pencil as a book are attached, and a return spring is urged between the slider and the front end of the center shaft so that it can be moved back and forth. Only when the inner cylinder is locked so as to prevent it from slipping, when one of the sliders is slid forward, the front end of a locking bar extending to the front end of the inner cylinder is locked to the rear end of the slider. The tip of the inner cylinder is fixed in a protruding state from the tip of the front shaft and can be interlocked by advancement of the inner cylinder, and a slit is formed at the rear of the inner cylinder, and an eraser is fixed to the rear of the slit. Eraser holder is provided on the outer periphery A protrusion is fitted into the slit, and a rear shaft having a spiral groove in the inner diameter portion is fitted on the outer periphery of the inner cylinder, and the protrusion of the eraser holder is inserted into the spiral groove and rearward of the inner cylinder. The shaft is prevented from coming off so that it can only rotate. By the above, each slider can be advanced alternately so that the tip of each cursive can be selectively projected and retracted from the tip of the tip of the front shaft. On the other hand, there is shown a dual-type writing instrument in which the rear end of the rear shaft is knocked so that the lead can be extended, and the eraser can be projected and retracted from the rear end of the rear shaft by rotating the rear shaft relative to the middle shaft. In Patent Document 4, the front shaft is detachably fixed to the front of the central shaft, and at least one front side of the slider guided in the axial direction in each of the longitudinal slit portions formed at a plurality of positions on the side surface of the central shaft. A plurality of cursive bodies with a book as a mechanical pencil are attached, and a return spring is urged between the slider and the front end of the central shaft so that it can be moved back and forth. The inner cylinder is locked so that it can only be removed, and one of the sliders is slid forward, so that the tip of the writing body is locked in a protruding state from the tip of the front shaft and the inner cylinder is advanced. The sliders can be linked with each other, and the tip of each cursive body can be selectively projected and retracted from the front end of the front shaft by alternately moving each slider forward. And the lead of the core Teeth and allow, also eraser device is shown multiplex writing implement comprising disposed integrally on the rear end of the inner cylinder.

  The present invention is a slider-type dual writing instrument equipped with a plurality of mechanical pencil writing bodies, the writing tip portion of which can be alternately projected and retracted at the front end of the front shaft, and the rear end of the front shaft or the middle shaft. The shaft is detachable, and when the rear shaft is removed, the core can be easily replenished from the rear end. The rear shaft is conveniently equipped with an eraser feeding device, cursive, correction tool, seal, etc. It is possible to provide easy-to-use compound writing instruments.

The present invention has the following configuration in order to achieve the above-described problems.
The dual writing instrument according to the first aspect of the present invention is a slider that is guided in the axial direction in each of the longitudinal slit portions that are fixed at the tip of the center shaft in a detachable manner, and are drilled at a plurality of locations on the side surface of the center shaft. A core pipe is fixed in front of the core pipe, a mechanical pencil cursive is attached to the front of the core pipe, and a slider is provided so that it can be moved back and forth by urging a return spring between the front of the slider and the center shaft. It is fixed to the core pipe in a dual-type writing instrument in which the front end of the cursive body can be selectively projected and retracted from the front end of the front shaft, and the rear shaft can be moved back and forth and detachably attached behind the middle shaft. At the rear end of the slider, a hole that opens to the core pipe, and a lid that allows the hole to be opened and closed are provided, the hole is opened, and the rear shaft is detached from the rear of the middle shaft. Mechanical pencil writing A core pipe connected to the core pipe can be refilled from the rear end, and a locking cylinder is locked to the rear end of the center shaft so as to be movable only in the forward and backward direction, and one of the sliders slides forward. When the slider is pushed, the rear end of the slider is locked to the front end of the locking bar extending to the front end of the locking cylinder, and the leading end of the writing body is fixed in a protruding state from the front end of the front shaft. It is provided so as to be integrated with.

  The dual writing instrument according to the invention described in claim 2 is the dual writing instrument according to claim 1, wherein a slit is formed behind the inner cylinder provided integrally with the locking cylinder, An eraser holder with an eraser attached to the back is attached by inserting a protrusion provided on the outer periphery thereof into a slit, and a rear shaft provided with a spiral groove in the inner diameter portion is fitted on the outer periphery of the inner cylinder. The projection is inserted into the spiral groove and the rear shaft is prevented from coming off with respect to the inner cylinder so that the rear shaft can only be rotated, and by the rotation of the rear shaft relative to the middle shaft, the eraser can appear and disappear from the rear end of the rear shaft.

  According to a third aspect of the present invention, there is provided the dual writing instrument according to the first aspect, wherein the rear shaft is integrally provided behind the inner cylinder integrally provided with the locking cylinder, A slit is formed on the side surface of the shaft, and protrusions and grooves are alternately provided on both sides of the slit, and an eraser holder with an eraser attached to the rear is an engagement protrusion provided on the outer periphery of the slit in the slit groove. The eraser is attached so that it can be engaged and disengaged, the operation button of the eraser holder with respect to the rear shaft is moved back and forth, and the eraser is engaged with the groove of the slit provided on the rear shaft, so that the eraser is attached to the rear end of the rear shaft. You can invade from.

The present invention is a slider-type dual writing instrument equipped with a plurality of mechanical pencil writing bodies, the writing tip portion of which can be alternately projected and retracted at the front end of the front shaft, and the rear end of the front shaft or the middle shaft. The shaft is detachable, and when the rear shaft is removed, the core can be easily refilled from the rear end. The rear shaft is conveniently equipped with an eraser feeding device, cursive material, correction tool, seal, etc. An easy-to-use compound writing instrument can be provided.
In addition, when replenishing the lead in a conventional compound writing instrument, it is troublesome to remove the tip and remove the thin mechanical pencil from the core pipe, and when removing the mechanical pencil from the core pipe. Although there are problems such as spilling the core or breaking the core, the present invention can solve the problem.

  1 to 4 show a first embodiment. The compound writing instrument of this embodiment includes a middle shaft 1, a front shaft 3, a pair of sliders 6 and 7, mechanical pencil writing bodies 10 and 11, a rear shaft 4, a locking cylinder 16, an inner cylinder 17, an eraser holder 18, an eraser 19, and the like. Is the main component. First, the middle shaft 1 is made of resin, and as shown in FIG. 1, longitudinal slit portions 1a and 1b are formed in the axial direction at two positions opposite to the rear shaft side surface. Further, window portions 2a and 2b are formed behind the longitudinal slit portion on the coaxial line. Also, a resin joint 5 is fixed to the tip hole of the central shaft 1, a partition part 5 b is provided in the inner hole part at the substantially center of the joint 5, and a hole 5 ba through which the rear part of the writing body is inserted into the partition part. , 5bb are provided, and a bulging engagement portion 5c is formed at the outer peripheral portion of the cylindrical portion 5a extending forward of the front end of the middle shaft 1.

  The front shaft 3 has a tapered front, and has a front end opening having an inner stepped portion 3b at the front end of the inner hole. In addition, the rear end hole is provided with a locking groove 3a that engages with an engaging portion 5c provided on the cylindrical portion 5a of the joint 5 so that the front shaft 3 is detachably fixed to the joint 5. . The method for fixing the joint 5 and the front shaft 3 is not limited to the above, and it is also possible to provide a screw portion between them and join them. Also, the joint 5 can be formed integrally with the tip of the middle shaft 1.

  The slider 6 is a shaft body having a projecting portion 6a that penetrates the longitudinal slit portion 1a of the central shaft 1, and a bulging first projecting portion 6b is formed on the opposite shaft side surface facing the projecting portion 6a. Then, a locking projection 6d is formed near the first projection 6b on the rear end surface, and a second projection 6c is further formed in front of the axial line. In addition, a hole 6f for fitting a rear end portion of a core pipe 12 to be described later is formed in the shaft center portion, and an insertion port 6g is formed at the rear end so that the core can be inserted into the core pipe. Further, a concave portion 6e is formed on the protruding portion 6a side, and a lid 8 is attached to the concave portion 6e by pivotally supporting a shaft support portion 8b. A lid portion 8a provided on one side of the shaft support portion 8b of the lid 8 is attached. Shields the insertion opening 6g, and a piece 8c provided on the opposite side of the shaft support 8b protrudes outward appropriately from the recess 6e. When the piece 8c is pushed inward, the lid 8a Rotates to open the insertion opening 6g. The lid portion 8a is engaged with the slider 6 so as not to rotate carelessly while being shielded from the slider 6. The slider 7 is formed in the same manner as the slider 6, and the lid 9 is also provided in the same manner.

  The locking cylinder 16 is formed with locking portions 16b and 16c having tapered protrusions on the side surface of the cylindrical portion 16a, and a protrusion locking portion 16d is formed at a required position on the inner periphery. A core insertion hole 16e is provided at the bottom, and a tapered guide is provided at the periphery of the insertion hole 16e so that the core can be easily inserted. Further, a locking bar 16f extending in a gate shape is formed at two opposing positions at the bottom front end of the cylindrical portion 16a, and a notch 16g is provided at the front end of the locking bar 16f.

  The inner cylinder 17 includes a front cylinder part 17a and a rear cylinder part 17c, and a locking groove 17b is formed on a side surface of the front cylinder part 17a. The locking groove 17b is provided so as to be detachably engaged with and integrated with the locking portion 16d of the locking cylinder 16 described above. A long slit 17f is formed on the opposite side surfaces of the crown portion 17g having a hole through which the eraser is inserted at the rear end of the rear cylinder portion 17c and the cylinder portion extending forward, and the slit 17f A locking portion 17e having a tapered protrusion on the side surface of the cylindrical portion is formed slightly forward from the front end.

The rear shaft 4 is made of resin, and has an inner hole 4a fitted to the outer periphery of the rear end of the middle shaft 1 at the front, and is provided with a step portion 4b with a slightly reduced diameter at the rear end, slightly behind the step portion 4b. A step 4c is provided.
A spiral groove 4d reaching the rear end is formed behind the stepped portion 4c.

  The eraser holder 18 is provided with a bottomed hole portion for fastening the rear end of the eraser 19 at the rear end, and is fitted into the slit 17f of the inner cylinder 17 at the outer peripheral portion of the front end, and the spiral groove of the rear shaft 4 Protrusions 18b that fit into 4d are provided at appropriate positions.

The mechanical pencil writing body 10 incorporates a general chuck mechanism, and is joined to the core pipe 12 via a joint 10a connected to the chuck mechanism at the rear end, and the rear end of the core pipe 12 is the hole of the slider 6 described above. It is fitted to 6f. The lead is fed out by interlocking the chuck with the back and forth movement of the slider 6 in a state where the step portion 10d of the base 10c of the mechanical pencil writing body 10 is in contact with the inner step portion 3b of the front shaft 3.
The mechanical pencil cursive 11 is configured in the same manner.

  The mechanical pencil writing bodies 10 and 11 are inserted into the center shaft 1 with the sliders 6 and 7 connected to the rear ends via the core pipes 12 and 13, and are provided in the partition portion 5 b of the joint 5 described above. The protrusions 6a and 7a of the sliders 6 and 7 are incorporated so as to penetrate through the longitudinal slits 1a and 1b of the middle shaft 1 through 5ba and 5bb. Further, it is urged rearward by return springs 14 and 15 interposed between the front ends of the sliders 6 and 7 and the partition portion 5 b of the joint 5.

  On the other hand, the eraser holder 18 is elastically inserted into the slit 17f of the inner cylinder 17 from the side, and the protrusion 18b of the eraser holder 18 is inserted into the slit 17f, so that the eraser holder 18 is prevented from rotating and sliding on the inner cylinder 17. It is freely movable. Further, the inner cylinder 17 is fitted and inserted with the rear end of the rear shaft 4 abutting the front end of the crown portion 17g, and the protrusion 18b of the eraser holder 18 is fitted into the spiral groove 4d of the rear shaft 4. Further, the locking portion 17e ahead of the inner cylinder 17 is locked to the stepped portion 4c of the rear shaft 4 by elastic deformation, so that the inner cylinder 17 can be rotated only with respect to the rear shaft 4. Further, the eraser 19 is inserted from the opening of the crown portion 17g, and the end of the eraser 19 is fixed to the eraser holder 18. As described above, when the rear shaft 4 is rotated with respect to the inner cylinder 17, the eraser 19 appears and disappears from the opening. The inner diameter of the opening of the crown portion 17g is slightly larger than the outer diameter of the eraser 19.

Further, the above-described locking cylinder 16 is inserted into the rear end hole of the middle shaft 1, and a pair of locking portions 16 b and 16 c provided on the side surface of the locking cylinder 16 are mutually connected to the window portions 2 a and 2 b of the middle shaft 1. It is inserted by elastic deformation and is retained and locked. The locking cylinder 16 is not rotatable with respect to the middle shaft 1 and can be advanced within an appropriate range. The range is set at an interval at which the step portion 4b of the rear shaft contacts the rear end of the middle shaft 1. As shown in FIGS. 2 and 3, the first protrusions 6b and 7b of the sliders 6 and 7 are extended in a gate shape from the front end of the cylinder part 16a of the locking cylinder 16 in the gap in the perpendicular direction. The locking bar 16f is fitted, and the notch 16g is provided at the tip of the locking bar 16f as described above.
Further, the inner cylinder 17 is integrated by engaging a locking groove 17 b provided on a side surface of the front cylinder portion 17 a with a locking portion 16 d of the locking cylinder 16.

  When the slider 6 is moved forward from the state shown in FIG. 2, the slider 6 slightly shifts in the axial direction of the central shaft 1, and a locking projection 6 d provided at the rear end is provided at the front end of the locking bar 16 f of the locking cylinder 16. Lock in the notch 16g. (See FIG. 1) Further, when the locking cylinder 16 is advanced from this state, the slider 6 is advanced in conjunction with the advancement. Next, when the other slider 7 is advanced from the state of FIG. 1, the second protrusion 7 c comes into contact with the first protrusion 6 b of the slider 6 to release the engagement of the notch, and the slider 6. Is retracted by the urging force of the return spring 14, and instead the locking projection 7d of the slider 7 is locked to the notch 16g of the locking bar 16f.

By the way, what was mentioned above makes it possible to appear and disappear two kinds of cursive letters, but more than that can also be used. FIG. 4 shows a case in which three types of cursive letters can appear and disappear. Sliders 25, 26, 27 are arranged to be able to move back and forth at 120 ° division positions with respect to the middle shaft 20, and a locking bar 24 is fitted in the gap between the sliders as described above, and the rear end face of each slider Is provided with a locking projection that engages with a notch provided at the front end of the locking bar.
Further, lids 21, 22, and 23 are provided at the rear ends of the sliders 25, 26, and 27, respectively.

FIG. 5 shows a second embodiment of the present invention, which is basically the same as the first embodiment. Only the differences will be described below.
First, the slit 36 of the inner cylinder 33 opens to the rear end, and the eraser holder 37 can be easily inserted into the slit 36. The rear end portion 38 of the slit 36 has a slightly inclined surface. Further, an engaging portion 35 having a ridge or a circumferential protrusion is formed on the circumferential surface of the cylindrical portion slightly ahead of the front end of the slit 36, and a circumferential shape is formed in front of the spiral groove of the rear shaft 30. A locking groove 32 is formed, and the rear shaft 30 is locked to the inner cylinder 33 so as to be rotatable only by mutual elastic deformation. At that time, the rear end portion 38 having the inclined surface of the inner cylinder 33 is brought into contact with the contact portion 31 having the inclined surface formed at the rear end of the inner hole portion of the rear shaft 30. It is possible to prevent the rear end from being deformed in the axial direction. Therefore, no trouble occurs when the eraser is attached or when the eraser is extended.

(Function)
When the slider 6 is advanced, the locking projection 6d of the slider 6 is locked to the notch 16f of the locking bar 24 as shown in FIG. 1, and the writing tip portion of the mechanical pencil writing body 10 extends from the tip opening of the front shaft 3. Protruding. In this state, when the rear shaft 4 is moved back and forth with respect to the middle shaft 1, the slider 6 is interlocked by the locking bar 16 f and the joint 10 c from the state in which the step portion 10 d of the base 10 c is in contact with the inner step portion 3 b of the front shaft 3. The chuck moves back and forth together with 10a and the lead is fed out.
Further, when the other slider 7 is moved forward, the locking of the slider 6 and the locking bar 16f is released, the writing tip portion of the mechanical pencil writing body 10 is retracted and is immersed in the front shaft, and instead the slider. 7 is locked to the locking bar 16 f and the writing tip of the mechanical pencil writing body 11 protrudes from the tip opening of the front shaft 3.

  Next, when the rear shaft 4 is rotated in one direction with respect to the middle shaft 1, the projection 18 b of the eraser holder 18 moves along the spiral groove 4 d of the rear shaft 4, so that the eraser holder 18 is gradually retracted and the eraser 19 Is fed out from the opening of the crown part 17g. Further, when the rear shaft 4 is rotated in the other direction, the eraser holder 18 moves forward, and at the same time, the eraser 19 is immersed from the opening of the crown portion 17g. In addition, since the thing of 2nd Embodiment acts similarly, the description is abbreviate | omitted.

Next, when the core is replenished to the core pipe 12, the rear shaft 4 is detached from the middle shaft 1, the slider 6 is locked in the forward movement state, and the one portion 8c of the lid 8 is pushed inward. 8a rotates to expose the core insertion opening 6g, and the core can be inserted from the insertion hole 16e of the locking cylinder 16.
When the slider 6 is retracted from this state, the lid portion 8a comes into contact with the bottom of the locking cylinder 16, and the lid portion 8a in the open state shields the insertion opening 6g. (It is free to shield the piece 8c by pulling it outward with a finger.) Note that the same operation is performed when the core pipe 13 is replenished with a core.
Further, in the above-described embodiment, the locking cylinder and the inner cylinder are provided separately, but it is possible to provide both integrally. In that case, when the rear shaft is detached from the middle shaft, it is possible to replenish the core directly into the insertion port of the slider core.

6 and 7 show a third embodiment of the present invention. Since it is basically the same as the embodiment described above, only the differences will be described.
A rear shaft 40 is integrally formed at the rear end of the front tube portion 41. That is, the flange portion 42 provided at the rear end of the front cylinder portion 41 is joined to the inner wall of the rear shaft 40.
Slits 45 are formed on the rear side surface of the rear shaft 40, and protrusions 43 and grooves 44 are alternately provided on both sides of the slit 45. In addition, an eraser holder 50 having an eraser 56 fixed to the rear end thereof is attached to the inner hole of the inner hole by engaging and disengaging an engaging protrusion 52 provided on the outer periphery thereof in the groove 44 of the slit 45. The engaging protrusion 52 is formed at the front end of the elastic piece 51 provided on the side surface of the eraser holder 50, and is engaged while being elastically displaced in the groove 44 while sliding and holds the protruding state of the eraser 56. Further, the center of the engagement protrusion 52 is slightly protruded to form the operation button 53, and the eraser holder 50 can be moved while releasing the engagement between the engagement protrusion 52 and the groove 44 by moving the operation button 53 back and forth. And
A crown 48 is fixed to the rear end of the rear shaft 40.

  A locking groove 41a is formed on the side surface of the cylindrical portion 22 of the front cylindrical portion 41, and the locking groove 41a is detachably attached to the locking portion 16d of the locking cylinder 16 of the above-described embodiment.

(Function)
When the operation button 53 is moved rearward with respect to the rear shaft 40, the engagement protrusion 52 of the eraser holder 50 moves while being engaged with and disengaged from the groove 44 along the slit 45 of the rear shaft 40. Retreats, and the eraser 56 is fed out from the opening of the crown 48. Further, when the operation button 53 is moved forward, the eraser holder 50 moves forward, and the eraser 56 is immersed from the opening of the crown 48 together with the operation button 53.

(Other embodiments)
The compound writing instrument of the present invention is equipped with a plurality of mechanical pencil writing bodies, the rear shaft is detachable with respect to the front shaft or the middle shaft, and when the rear shaft is removed, the lead can be easily refilled from the rear end. Therefore, the front shaft and the middle shaft can be integrally formed, and there is an advantage that it can be provided at low cost.
In addition, the rear shaft is provided with an eraser feeding device in the embodiment, but it can be provided in a style equipped with a writing body such as an underline, a correction tool such as a correction pen or a correction tape, a seal, etc. is there.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole longitudinal cross-sectional view which shows the 1st Embodiment of this invention, and the state which protruded the writing front-end | tip part of the mechanical pencil writing body from the front-end | tip front-end | tip opening | mouth is shown. In 1st Embodiment, the longitudinal cross-sectional view in the accommodation state of a cursive body is shown. FIG. 8 shows a cross-sectional view taken along arrow AA in FIG. 2 or FIG. 7. FIG. 4 is a cross-sectional view corresponding to FIG. 3 when there are three types of cursive bodies. In the whole longitudinal cross-sectional view which shows the 2nd Embodiment of this invention, the state which protruded the writing front-end | tip part of the mechanical pencil writing body from the front-end | tip front-end opening | mouth is shown. In the whole longitudinal cross-sectional view which shows the 3rd Embodiment of this invention, the state which protruded the writing front-end | tip part of the mechanical pencil writing body from the front-end | tip front-end opening | mouth is shown. In 3rd Embodiment, the longitudinal cross-sectional view in the accommodation state of a cursive body is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Middle shaft 1a Longitudinal slit part 1b Longitudinal slit part 1c Inner hole of middle shaft 2a Window part 2b Window part 3 Front shaft 3a Locking groove 3b Inner stage part 4 Rear shaft 4a Inner hole 4b Step part 4c Step part 4d Spiral groove 5 Joint 5a Cylindrical portion 5b Partition portion 5ba hole 5bb hole 5c engaging portion 6 slider 6a protruding portion 6b first protruding portion 6c second protruding portion 6d locking protrusion 6e recessed portion 6f hole portion 6g insertion port 7 slider 7a protruding portion 7b first portion Projection 7c second projection 7d locking projection 7e recess 7f hole 7g insertion port 8 lid 8a lid 8b shaft support 8c piece 9 lid 9a lid 9b shaft 9c piece 10 mechanical pencil writing body 10a joint 10b Chuck spring 10c Base 10d Step part 11 Mechanical pencil cursive body 12 Core pipe 13 Core pipe 14 Return spring 15 Return Pulling 16 Locking tube 16a Tube portion 16b Locking portion 16c Locking portion 16d Locking portion 16e Insertion hole 16f Locking bar 16g Notch 17 Inner tube 17a Front tube portion 17b Locking groove 17c Rear tube portion 17d Stepped portion 17e Locking Portion 17f Slit 17g Crown crown 18 Eraser holder 18a Tube portion 18b Projection 18c Elastic piece 18d Locking projection 19 Eraser 20 Center shaft 21 Lid 22 Lid 23 Lid 24 Locking bar 25 Slider 26 Slider 27 Slider 30 Rear shaft 31 Abutting portion 32 Locking groove 33 Inner tube 34 Front tube portion 35 Engagement portion 36 Slit 37 Eraser holder 38 Rear end portion 40 Rear shaft 41 Front tube portion 41a Locking groove 42 Gutter portion 42a Window 43 Projection 44 Groove 45 Slit 46 Shaft portion 47 Projection 48 crow crown 49 locking groove 50 eraser holder 51 elastic piece 52 engagement protrusion Start 53 Operation button 54 Engagement piece 55 Locking projection 56 Eraser

Claims (3)

A lead pipe is detachably fixed to the tip of the middle shaft, and a core pipe is fixed in front of the slider guided in the axial direction in each of the longitudinal slit portions drilled at a plurality of positions on the side surface of the middle shaft. Attach mechanical pencils to each, and provide a slider that can move back and forth by urging a return spring between the front of the slider and the middle shaft, and select the tip of each script from the tip of the front shaft In a compound writing instrument in which the rear shaft can be moved back and forth at the rear of the middle shaft and detachably attached to the rear of the middle shaft,
The rear end of the slider fixed to the core pipe is provided with a hole that opens into the core pipe and a lid that allows the hole to be opened and closed. The hole is opened and the rear shaft is detached from the rear of the center shaft. In this state, the core pipe connected to the mechanical pencil cursive can be replenished with a core from the rear end thereof, and a locking cylinder is locked to the rear end of the central shaft so as to be able to move only forward and backward. When one of the sliders is slid forward, the rear end of the slider is locked to the front end of the locking bar extending to the front end of the locking cylinder, and the tip of the writing body is fixed in a protruding state from the tip of the front shaft. And a writing instrument in which the locking cylinder is integrated with the rear shaft.   A slit is formed at the rear of the inner cylinder provided integrally with the locking cylinder, and an eraser holder with an eraser attached to the rear is attached by fitting a protrusion provided on the outer periphery thereof into the slit, A rear shaft provided with a spiral groove in the inner diameter portion is fitted on the outer periphery of the inner cylinder, and the protrusion of the eraser holder is inserted into the spiral groove, and the rear shaft is prevented from coming off so as to be rotatable only with respect to the inner cylinder. The compound writing instrument according to claim 1, wherein the eraser can be projected and retracted from the rear end of the rear shaft by rotation of the rear shaft with respect to the middle shaft. A rear shaft is provided integrally behind the inner cylinder provided integrally with the locking cylinder, slits are formed on the side surfaces of the rear shaft, and protrusions and grooves are alternately provided on both sides of the slit. The eraser holder with the eraser attached to the rear is attached by engaging and disengaging the engagement protrusion provided on the outer periphery of the slit in the groove of the slit, and the operation button of the eraser holder with respect to the rear shaft is moved back and forth. The dual writing instrument according to claim 1, wherein the eraser can be projected and retracted from the rear end of the rear shaft by engaging the engagement protrusion with a slit groove provided on the rear shaft.

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