JP4634167B2 - Double writing instrument - Google Patents

Description

  The present invention is a compound writing instrument in which a plurality of writing instruments such as a mechanical pencil and a ballpoint pen are mounted, and a writing tip can be alternately projected and retracted from a tip end of a shaft by moving a slider provided on a side surface of a shaft cylinder back and forth. Regarding provision.

Reality 1-28333 JP-A-9-156288 JP-A-9-58183 JP-A-9-58184 In JP-A-11-32183 (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 the front 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 rearward longer than the sliding piece, and place a hole slightly larger than the outer diameter of the core pipe at the rear position of the guide tube at the rear position of the groove where the mechanical pencil is fitted. By inserting the rear end of the core pipe into the hole, the rear end of the core pipe can be slid in the hole when the sliding piece moves back and forth, and a funnel is provided at the rear end of the guide tube. In the funnel portion, there is shown a dual-type 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 is 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. 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. (Patent Document 5) contains a plurality of writing bodies in a shaft cylinder, the writing bodies are urged rearward by a spring, and a knock bar (slider) attached to the rear end of the writing body is pressed, In the dual writing instrument that causes the writing body to protrude from the shaft cylinder by engaging the locking portion of the knock bar with the locking step provided in the shaft cylinder, the knock bar is provided with a fitting hole, By fitting the rear end of the cursive body into the fitting hole, and further providing a cutout portion larger in diameter than the cursive body diameter on the outer surface of the mating portion of the cursive body on the knock bar, There has been proposed a dual-type writing instrument with a mechanism in which the knock bar body tilts in the axial center direction when engaged with a locking step provided on the shaft cylinder, thereby causing the trailing end of the writing body to protrude from the notch portion of the knock bar. Yes.

The present invention is a compound writing instrument in which a plurality of writing instruments such as mechanical pencils and ballpoint pens are mounted, and the writing tip can be alternately projected and retracted from the tip end of the shaft tip by moving the slider provided on the side surface of the shaft cylinder back and forth. In addition, the insertion hole is formed in the shaft center of the slider, so that the length of the writing tip and the slider trailing edge can be set short, making it a short writing tool convenient for carrying around, Equipped with an eraser feeding device, cursive material, correction tool, seal, etc. at the end, it is possible to provide a convenient and easy-to-use compound writing instrument. At that time, it is possible to easily form a slider having a fitting hole in the axial center portion with a mold, and to provide an inexpensive dual writing instrument.
Further, the rear shaft can be freely attached to and detached from the shaft cylinder, and when the rear shaft is removed, the refilling of the core and the replacement of the ballpoint pen writing body can be easily performed from the rear end.

The present invention has the following configuration in order to achieve the above-described problems.
According to a first aspect of the present invention, there is provided a dual-type writing instrument comprising: a shaft of a slider guided in the axial direction in each of longitudinal slit portions provided at a plurality of locations on a side surface of the shaft tube by providing a tip shaft at the tip of the shaft tube. A fitting hole is provided in the core, and only the core pipe, the receiving pipe, or the ballpoint pen writing body or any combination thereof is fitted in the fitting hole, and the rear ends thereof are fitted in front of the core pipe. A mechanical pencil cursive is attached, a ballpoint pen cursive is attached in front of the receiving pipe, and a slider is provided between the front of the slider and the tip of the shaft so that it can be moved back and forth. In a dual-type writing instrument in which the tip of the cursive body can be selectively projected and retracted from the tip end of the tip shaft, three locations are alternately arranged facing each other on the outer surface along the axial direction of the slider. And cutting the window is provided above, fitting hole in the connected state to the axis portion reaches the rear end from the front end of the slider is formed.

The dual writing instrument according to claim 2 is the dual writing instrument according to claim 1,
The rear shaft can be moved back and forth and detachably attached to the rear of the shaft tube, and at the rear end of the slider fixed to the core pipe, the insertion port that opens to the core pipe, and the insertion port can be opened and closed freely A lid that opens to the receiving pipe and a lid that opens and closes the hole are provided at the rear end of the slider fixed to the receiving pipe to open the hole. The core pipe connected to the mechanical pencil writing body can be refilled from the rear end in a state where the rear shaft is detached from the rear of the shaft cylinder, and the ballpoint pen writing body can be mounted from the rear end of the receiving pipe. And a locking bar which extends to the front end of the locking cylinder when one of the sliders is slid forward, and the locking cylinder is locked at the rear end of the shaft cylinder so that it can only move back and forth. The back end of the slider is locked to the front end of the Is fixed to the protruding state from the distal end, the locking cylinder is provided such that the rear shaft integrally.

The present invention is a compound writing instrument in which a plurality of writing instruments such as mechanical pencils and ballpoint pens are mounted, and the writing tip can be alternately projected and retracted from the tip end of the shaft tip by moving the slider provided on the side surface of the shaft cylinder back and forth. In addition, the insertion hole is formed in the shaft center of the slider, so that the length of the writing tip and the slider trailing edge can be set short, making it a short writing tool convenient for carrying around, Equipped with an eraser feeding device, cursive material, correction tool, seal, etc. at the end, it is possible to provide a convenient and easy-to-use compound writing instrument. Further, the slider having the fitting hole in the shaft center portion can be easily formed with a mold, and an inexpensive dual writing instrument can be provided.
In addition, the rear shaft is equipped with an eraser feeding device, cursive material, correction tool, seal, etc., and the rear shaft is detachable from the shaft cylinder. The ballpoint pen can be easily exchanged from the rear end.
The conventional compound writing instrument is difficult to operate because it removes the tip shaft and attaches and removes the thin mechanical pencil from the core pipe. Further, when the mechanical pencil is attached to and detached from the core pipe, the core is spilled. There were problems such as breaking the core. The above-mentioned Patent Documents 1 and 2 have solved the problem. However, when replacing the ballpoint pen writing body, it is necessary to attach and detach the tip shaft as usual, and there is a problem that causes confusion in the operation and the user. There was no impression that it became so convenient for me.
The present invention can solve all the conventional problems.

  1 to 4 show a first embodiment. The compound writing instrument of this embodiment includes a shaft cylinder 1, a front shaft 3, a pair of sliders 6, 7, a mechanical pencil writing body 10, a ballpoint pen writing body 11, a rear shaft 4, a locking cylinder 16, an inner cylinder 17, and an eraser holder 18. The eraser 19 is the main component. First, the shaft cylinder 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. Further, a resin joint 5 is fixed to the tip hole of the shaft tube 1, a partition portion 5 b is provided in the inner hole portion at the substantially center of the joint 5, and a hole through which the rear portion of the writing body is inserted in the partition portion. 5ba and 5bb are provided, and a bulging engagement portion 5c is formed on the outer peripheral portion of the cylindrical portion 5a extending in front of the front end of the shaft cylinder 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. The joint 5 can also be formed integrally with the tip of the shaft tube 1.

The slider 6 is a shaft body having a protruding portion 6a that protrudes into the longitudinal slit portion 1a of the shaft tube 1, and a bulging first protruding portion 6b is formed on the outer surface opposite to the protruding portion 6a. 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, cut windows 6h are provided alternately at three or more locations on the outer side surface along the axial direction of the slider 6 so as to face each other, and the state where the slider 6 is connected to the axial center from the front end to the rear end is provided. An insertion hole 6f is formed, and a rear end portion of a core pipe 12, which will be described later, is fitted into the fitting hole 6f in contact with the step portion 6i, and a core can be inserted into the core pipe at the rear end. Is formed.
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.

  Further, as described above, by providing the cut windows 6h alternately on the outer surface along the axial direction of the slider 6 so as to face each other, the mold is fixed to the facing movable side without using a thin core pin. Protrusions for forming fitting holes are provided in the cavity portions on the side, and the protrusions are in side contact with each other in a state where the mold is closed. A fitting hole 6f in a connected state is formed. Therefore, it is not necessary to slide the core pin with the mold or slide the mold cavity at the time of mold release, so the mold structure is simple and many molds can be taken, and the molding cycle can be shortened. The molding cost of the slider becomes low, and the dual writing instrument can be provided at low cost.

The slider 7 is a shaft body having a protruding portion 7a that protrudes into the longitudinal slit portion 1b of the shaft cylinder 1, and a bulging first protruding portion 7b is formed on the outer surface opposite to the protruding portion 7a. Then, a locking projection 7d is formed near the first projection 7b on the rear end surface, and a second projection 7c is further formed in front of the axial line.
In addition, the outer surface along the axial direction of the slider 7 is provided with cut windows 7g alternately at three or more locations facing each other, and is fitted in the state where the slider 7 is connected to the shaft center from the front end to the rear end. A hole 7f is formed, a rear end portion of a receiving pipe 13 to be described later is fitted into the fitting hole 7f, and a hole portion 7e for accommodating a plug body 20 to be described later is formed at the rear end. An insertion opening that allows loose insertion is formed in front of the receiving pipe 13.
In addition, a slide-type lid 9 is provided at the rear end of the slider 7 that can be pulled out toward the protruding portion 7a. When the slider 7 is pulled out, the insertion opening opens and the ball-point pen writing body 11 is moved forward of the receiving pipe 13. The plug 20 is accommodated with the front end in contact with the hole 7e at the rear end, the lid 9 is pushed in, the insertion portion is blocked by the lid 9a, and writing pressure is applied to the tip of the ballpoint pen writing body. However, movement to the rear end is prevented.
In the above embodiment, the stopper 20 is fixed to the rear end of the ballpoint pen writing body 11, but a convex portion is formed on the outer periphery (ink containing tube) of the rear end portion of the ballpoint pen writing body. The plug body can be omitted if it comes into contact with the front end of the hole 7e at the rear end of the slider.
Further, the lid portion 9 is provided with an engagement groove such as a dovetail groove and a convex portion between the slider 7 so that the lid portion 9 is not separated from the rear side of the slider 7. Further, if necessary, an engaging portion is provided between the sliding portions so that the lid portion 9a does not slide carelessly in a shielded state.
Further, a vent hole 20a is provided at the rear end of the tail plug 20 so that the rear end hole of the ball-point pen writing body 11 can be replaced with outside air, and a groove for ventilation is also provided on the inner surface of the lid portion 9a. The ventilation means can be provided without being limited to the embodiment.

  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 recessed locking portion 16d is formed at a required position on the inner periphery, so that the bottom of the front end In addition, an insertion hole 16e for allowing the core to communicate with the core pipe 12 is provided, and a tapered guide is provided at the periphery of the insertion hole 16e so that the core can be easily inserted. In addition, an insertion port 16 h through which the ballpoint pen writing body 11 can be inserted is provided in the receiving pipe 13. Furthermore, the bottom part front end of the cylinder part 16a is formed with a locking bar 16f extending in a gate shape at two opposing positions, 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 convex locking part 17b is formed on a side surface of the front cylinder part 17a. The locking portion 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 opposite sides 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 writing body 10 is inserted into the middle shaft 1 with a slider 6 connected to the rear end via a core pipe 12 and passes through the hole 5ba provided in the partition portion 5b of the joint 5 described above. The projecting portion 6a of the slider 6 is incorporated into the longitudinal slit portion 1a. Further, it is urged rearward by a return spring 14 interposed between the front end of the slider 6 and the partition portion 5 b of the joint 5.
Further, the ballpoint pen writing body 11 is mounted so as to protrude forward of the receiving pipe 13, and the slider 7 is connected to the rear end of the receiving pipe 13 so as to be fitted into the center shaft 1, and the hole 5 bb provided in the partition portion 5 b of the joint 5 is provided. The protrusion 7 a of the slider 7 is incorporated so as to penetrate through the longitudinal slit 1 b of the central shaft 1. Further, it is urged rearward by a return spring 15 interposed between the front end of the slider 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. In addition, the inner cylinder 17 is integrated by engaging a locking portion 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 26, 27, 28 are arranged to be able to move back and forth at 120 ° division positions with respect to the middle shaft 21, and the locking bar 25 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.
Also, lids 22, 23, and 24 are provided at the rear ends of the sliders 26, 27, and 28, 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 shaft cylinder 1, the slider 6 is interlocked by the locking bar 16f, and the step portion 10d of the base 10c comes into contact with the inner step portion 3b of the front shaft 3. The chuck moves back and forth together with the joint 10a to feed out the lead.
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 ballpoint pen writing body 11 protrudes from the tip opening of the tip shaft 3.

  Next, when the rear shaft 4 is rotated in one direction with respect to the barrel 1, the protrusion 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 drawn 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 shaft cylinder 1, the slider 6 is locked in the forward movement state, and the piece 8c of the lid 8 is pushed inward. The portion 8a rotates to expose the lead insertion port 6g, and the lead 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.) It should be noted that the core pipe 12 is refilled 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.

  Further, when the ballpoint pen writing body 11 is attached to the receiving pipe 13, the rear shaft 4 is detached from the shaft cylinder 1, and the cover 9 is pulled out to the protruding portion 7 a side of the slider 7, so that the insertion opening of the hole portion 7 e is exposed. The ballpoint pen 11 can be inserted. The ballpoint pen writing body 11 is inserted, the plug body 20 is accommodated in the hole 7e with the front end in contact, the cover 9 is pushed in, the insertion opening is shielded by the cover 9a, and the plug 20 is moved to the rear end. Is fixed in a blocked state.

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 shaft 46 at the rear end of the rear shaft 40.

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

(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 writing instruments such as mechanical pencils and ballpoint pens, the rear shaft is detachable from the shaft cylinder, and when the rear shaft is removed, the replenishment of the core from the rear end and the ballpoint pen Since the replacement of the refill is facilitated, the front shaft and the shaft tube can be formed integrally, and there is an advantage that it can be provided at a 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 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 Shaft cylinder 1a Longitudinal slit part 1b Longitudinal slit part 1c Inner hole of the center 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 Tube 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 Fitting hole 6g Insertion port 6h Cutting window 7 Slider 7a Projection 7b 1st projection 7c 2nd projection 7d Locking projection 7e Hole 7f Fitting hole 7g Cutting window 8 Lid 8a Lid 8b Shaft support 8c Single piece 9 Lid 9a Lid 9b Groove 10 Sharp pencil writing Body 10a Joint 10b Chuck spring 10c Base 10d Step 11 Ball pen writing body 12 Core pipe 13 Receiving 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 Part 17f Slit 17g Crown part 18 Eraser holder 18a Tube part 18b Protrusion 18c Elastic piece 18d Locking protrusion 19 Eraser 20 Plug 20a Vent 21 Central shaft 22 Lid 23 Lid 24 Lid 25 Locking bar 26 Slider 27 Slider 28 Slider 28 Slider 30 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 47 Protrusion 48 Sky crown 49 Locking groove 50 Eraser holder 51 Elastic piece 52 Engagement protrusion 53 Operation button 54 Engagement piece 55 Locking protrusion 56 Eraser

Claims (2)

  A front shaft is provided at the tip of the shaft tube, and in each of the long slit portions drilled at a plurality of locations on the side surface of the shaft tube, a mounting hole is provided in the axial center of the slider guided in the axial direction. The rear end of each of the core pipe, the receiving pipe, and the ballpoint pen writing body, or any combination thereof, is fitted, and a mechanical pencil writing body is attached to the front of the core pipe. A ballpoint pen is attached to the slider, and a slider is provided between the front of the slider and the tip of the shaft so that it can be moved back and forth, and the tip of each cursive is selected from the tip of the tip. In the dual writing instrument that can be projected and retracted, the outer surface along the axial direction of the slider is provided with three or more cut windows alternately facing each other in front of the slider. Multiplex writing implement, characterized in that the fitting hole in the connected state is formed in the lead axis portion to the rear end of. The rear shaft can be moved back and forth and detachably attached to the rear of the shaft tube, and at the rear end of the slider fixed to the core pipe, the insertion port that opens to the core pipe, and the insertion port can be opened and closed freely A lid that opens to the receiving pipe and a lid that opens and closes the hole are provided at the rear end of the slider fixed to the receiving pipe to open the hole. The core pipe connected to the mechanical pencil writing body can be refilled from the rear end in a state where the rear shaft is detached from the rear of the shaft cylinder, and the ballpoint pen writing body can be mounted from the rear end of the receiving pipe. And a locking bar which extends to the front end of the locking cylinder when one of the sliders is slid forward, and the locking cylinder is locked at the rear end of the shaft cylinder so that it can only move back and forth. The back end of the slider is locked to the front end of the Is fixed to the protruding state from the tip, dual writing implement of claim 1, the locking cylinder is provided such that the rear shaft integrally.

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