JPH0743920U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] By rotating the cap with respect to the front shaft or the center shaft, the tips of a plurality of cursives can be selectively retracted from the front shaft tip opening, and the rear end of the cap can be retracted. (EN) It is possible to inexpensively provide a compound writing instrument in which an eraser can appear and disappear by rotating a crown. In a compound writing instrument capable of selectively projecting and retracting the tip of each writing body from a tip opening of a tip shaft, a cylindrical portion having a slit 37 is integrally provided behind a cylindrical cam 5 and is made of a resin. A spiral groove 36 is formed in the inner hole of the crown 34 of
The cap 4 made of a resin for accommodating the cylindrical portion of the cylindrical cam 5 and the cylindrical portion 35 of the crown in a state where the cylindrical portion of the cylindrical cam 5 is fitted in the inner hole of the cap, and the cap 4 and the cylindrical cam , The crown 34 is rotatably fixed to the cap 4, and the eraser holder 40 that holds the eraser 46 in the cylindrical portion of the cylindrical cam 5 has the projection 42, the slit 37, and the spiral groove 3.
It is mounted in a state of being fitted in 6, and the tip of the cursive body appears and disappears by rotating the cap 4 with respect to the tip shaft 3 or the center shaft 1, and the eraser 46 by rotating the crown portion 34 ′ with respect to the cap 4. Can appear and disappear.

Description

[Detailed description of the device]

[0001]

[Industrial field of application]

 The present invention relates to the provision of a compound writing instrument in which the tips of a plurality of writing materials can be alternately retracted and retracted at the tip of the leading shaft and the eraser can be retracted and retracted from the rear end of the cap.

[0002]

[Prior art]

 Conventionally, as an example of a compound writing instrument, as shown in Japanese Utility Model Publication No. 64-3491 published by the same applicant, it has a sliding groove for guiding two writing instruments and is fixed to a leading shaft. It has a guide barrel and a cam slope that contacts the sliding commas attached to the two cursives fitted to the guide barrel at the front end, and the rear end serves as a knocking portion in the axial direction with respect to the cap. Equipped with a cylindrical cam mounted so that it can move freely and can rotate in the circumferential direction integrally, and two cursives can be selectively projected and retracted at the tip of the tip shaft by rotating the cap with respect to the tip shaft. There are multiple writing instruments. Further, as a cited example of the present application, as shown in Japanese Utility Model Laid-Open No. 60-120889 by the same applicant, a compound type in which a crown protruding from the rear end of the cap is rotated so that an eraser appears and disappears. Writing instruments exist.

[0003]

[Problems to be solved by the device]

 In the above cited example, there are problems that metal parts are used in many parts, the structure is complicated, the number of parts is large, and the cost is high.

[0004]

[Means for Solving the Problems]

 The compound writing instrument of the present invention devised to solve the above-mentioned problems is provided with engaging portions for fitting the tip of the resin-made front shaft and the tip of the resin-made center shaft in a non-rotatable and retaining state. Fix both. A guide tube that is integrated with the center shaft and a substantially L-shaped window that connects a vertical groove and a peripheral groove through a narrow portion are drilled in the rear side surface of the center shaft, and slides in multiple guide grooves provided in the guide cylinder. A plurality of cursive bodies, at least one of which has a top fixed to the rear end and a mechanical pencil, are mounted so that they can be moved back and forth respectively via return springs, and the cam slope that is displaced in the axial direction is circled at the front end. A protrusion is provided on the side surface of the cylindrical cam that is shaped like a ring, and the protrusion is elastically fitted into the circumferential groove to prevent the cylindrical cam from rotating with respect to the guide cylinder and center shaft in a certain range and allowing the shaft to move. Or, by rotating the cylindrical cam with respect to the center shaft, each sliding piece is alternately moved in the front-rear direction so that the tip of each cursive body can be selectively retracted from the tip opening of the tip shaft, and only when the mechanical pencil is selected. The cylindrical cam moves along the axis to extend the core. Further, a cylindrical portion having a slit is integrally provided at the rear of the cylindrical cam, and a spiral groove is formed in the inner hole of the crown made of resin on the other hand, so that the cylindrical portion of the cylindrical cam is made of resin. The cap and the crown of the cylindrical cam are fitted in the inner hole of the cap, and the cap and the cylindrical cam are integrated together, and the crown is fixed to the cap so that the crown can only rotate. An eraser holder with an eraser attached to the inside of the cylindrical cam inserts its protrusion into the slit and spiral groove, and the cap is rotated with respect to the tip shaft or center shaft, so that the tip of the cursive body appears and disappears, and the top of the cap is raised. The eraser can be retracted by rotating the crown. As described above, since the compound writing instrument of the present application has a simple structure with a reduced number of parts, it is easy to assemble and cost down is possible. Further, according to the embodiments described later, the projection of the cylindrical cam is prevented from coming into contact with the front wall of the circumferential groove even if a drop impact is applied to the rear end of the cap.

[0005]

【Example】

 First, FIGS. 1 and 3 show an embodiment of the present invention. The compound writing instrument of the present invention comprises a center rod 1, a tip shaft 3, a cylindrical cam 5, a pair of sliding pieces 6, a mechanical pencil writing body 7, a writing body 8 such as a ballpoint pen, a cap 4, a guide cylinder 2, and a cap 4, The crown 34, eraser holder 40, and eraser 46 are the main constituent elements. First, as shown in FIG. 1, the inner shaft 1 is made of resin, and has an axially long inner groove 9 that is open to the side surface from the substantially central portion to the rear end, and a similar guide groove 9 ′ on the opposite side surface. The guide cylinder 2 is provided. The front half of the guide cylinder 2 is provided with a cylinder part 10 having a partition 16 having holes 32, 32 'communicating with the respective guide grooves 9, 9', and having a front end opened. The stepped portion 31 is formed on the front side of the stepped portion 31.

Further, as shown in FIG. 2, a vertical groove 18 is connected to a circumferential groove 19 at a rear side surface of the center shaft 1 via a forward inclined surface 47, and a substantially L-shaped window is formed. The part is perforated. Further, as will be described later, the protrusion 17 of the cylindrical cam 5 is inserted from the vertical groove 18, and the protrusion 17 elastically expands the inclined surface 47, passes through the narrow portion 48, and enters the circumferential groove 19. The cylindrical cam 5 is rotated while the projection 17 is in contact with the circumferential rear wall of the circumferential groove 19 so that the writing portion of the writing instrument 7 such as the mechanical pencil 7 or the writing instrument such as a ballpoint pen is alternately projected and retracted from the tip of the leading shaft. become. Further, the circumferential groove 19 is provided with a wide groove 49 so that the cylindrical cam 5 can be axially moved at the position of the projection 17 when the mechanical pencil writing body 7 is projected, and when the writing body is stored or the writing body 8 such as a ballpoint pen is used. At the position of the protrusion 17 at the time of projecting, the inclined surface 51b is connected between the rear wall 51a and the rear wall 51c of the circumferential groove 19 so that the cylindrical cam 5 cannot substantially move axially. It is provided. Further, as will be described later, it is set so that the step portion 21 of the cap 4 abuts on the rear end of the center shaft 1 at the front end of the axial transition and the front end of the protrusion 17 does not abut on the front wall 52 of the circumferential groove 19.

The front shaft 3 has a tapered front portion, and an inner step portion 27 is provided at the front end of the inner hole portion to provide a front end opening. Further, the rear end hole is provided with an engagement groove 12 that is engaged with an engaging portion 13 provided on the outer peripheral portion of the tubular portion 10 of the guide tube to prevent the tubular portion 10 from coming off and preventing rotation. There is. The cylindrical portion 10 and the tip shaft 3 are detachably fixed with an appropriate force. (Same as the configuration of the front shaft in Japanese Utility Model Publication No. 64-3491)

The cap 4 is made of resin and has a circumferential step portion 21 formed in the inner hole of the front side. An engaging portion 33 having a circumferential groove is formed in the rear inner hole. The cylindrical cam 5 has a tubular shape, and has a cam slope 14 that is circumferentially displaced forward and backward at the front edge, and a notch 15 is formed at the foremost end of the cam slope 14. Further, on the side surface of the cylindrical cam 5, there is formed a protrusion 17 which is inserted into the vertical groove 18 of the center shaft 1 and elastically fits into the circumferential groove 19 so as to rotate and prevent from coming off within a certain range (approximately 180 degrees). .

By the way, the cylindrical cam 5 has a tubular portion extending rearward, a circumferential flange portion 20 is formed on the side surface of the tubular portion, and a long slit 37 is formed behind the step portion 45. There is. On the other hand, the resin crown 34 has a spiral groove 36 formed in its inner hole, a cylindrical portion 34 'at the rear and a cylindrical portion 35 at the front, and the peripheral surface of the cylindrical portion 35 has a protruding shape. Engagement portion 35 'is formed. The cylindrical cam 5 is fitted in the inner hole of the cap 4, and the flange portion 20 is brought into contact with the step portion 21. It should be noted that grooves and ribs or non-circular portions are provided between the peripheral surface of the cylindrical cam and the inner surface of the stepped portion to prevent mutual rotation. It is also possible to provide a rotation stopping portion between the collar portion 20 and the inner hole of the cap 4 (not shown).

By the way, the tubular portion 35 of the crown 34 is fitted into the rear inner hole of the cap 4 in a state of being fitted to the outer periphery of the tubular portion having the slit 37, and the engaging portion 35 ′ of the tubular portion 35 is fitted. Is elastically fitted to the engaging portion 33 of the cap 4, and the collar portion 20 of the cylindrical cam 5 is sandwiched between the step portion 21 of the cap and the tip of the tubular portion 35 of the crown, and is attached to the cap 4. The cylindrical cam 5 is integrated, and the crown 34 is fixed to the cap 4 so as to be rotatable only.

An eraser holder 40 having an eraser 46 attached to the rear end is mounted in the cylindrical portion having the slit 37 of the cylindrical cam. The eraser holder 40 is formed with a pair of elastic pieces 43 sandwiching the eraser 46 at the rear, and the elastic pieces 43 have locking projections 44 on the inner surface thereof. A projection 42 is formed on the outer circumference of the front cylindrical portion 41. The eraser holder 40 has the protrusion 42 and the elastic piece 43 fitted in the slit 37 of the cylindrical portion, and the protrusion 42 is further fitted in the spiral groove 36 of the crown 34 and arranged in the cylindrical portion. In this state, when the cylindrical portion 34 'of the crown is rotated with respect to the cap 4, the eraser holder 40 moves back and forth, and the eraser 46 can be retracted from the rear end hole 38 of the crown.

Further, the sliding piece 6 has a projection 22 on the outer surface thereof, and a central portion projects from the rear end surface of the projection 22 and both sides thereof have substantially the same slope as the cam slope 14 of the cylindrical cam 5 described above. It has a slope. Further, there is provided a hole that abuts on the flange portion 24 of the core pipe 23 and projects and fits behind the core pipe 23 for a long time. Similar to the sliding piece 6, the sliding piece 6'has a projection 22 'and a cam slope, and an engaging portion 26 for fixing the rear end of the writing body 8 such as a ballpoint pen is provided at the tip. The locking portion may be formed in a pipe shape and the rear end of the writing body may be fitted therein.

The mechanical pencil writing body 7 incorporates a general chuck mechanism, is joined to the core pipe 23 via a joint 29 connected to the chuck mechanism at the rear end, and has a flange portion provided at the rear of the core pipe 23. The sliding piece 6 is fitted in contact with the sliding piece 24, and the rear end hole of the core pipe 23 protruding from the rear end of the sliding piece 6 is closed by a tail plug 25 or the like. The lead-out is performed by moving the chuck according to the axial transition of the sliding piece 6 while the step portion 28 at the tip of the mechanical pencil writing body 7 is in contact with the inner step portion 27 of the tip shaft 3.

Next, the assembly order will be described. The mechanical pencil writing body 7 and the writing body 8 such as a ballpoint pen are connected to the respective sliding pieces 6 and 6'at their rear ends, and each of the above-mentioned center shaft guide cylinders 2 is connected. The return springs 30, 30 'are movably fitted in the guide grooves 9, 9'and interposed between the front end faces of the sliding pieces 6, 6'and the partition 16 on the front face of the guide grooves 9, 9'. Is urged backwards.

On the other hand, the cylindrical cam 5 is fitted in the inner hole of the cap 4, and the eraser holder 40 having the eraser 46 fixed therein is fitted in the tubular portion having the slit 37, so that the tubular portion 35 of the crown 34 is fixed. The crown 34 is fitted in the inner hole of the cap 4 in a state where the cylindrical portion of the cylindrical cam 5 is fitted, and the crown 34 is rotatably fixed to the cap 4, and the collar portion 20 of the cylindrical cam is attached to the step of the cap. The cylindrical cam 5 is sandwiched between the portion 21 and the tip of the tubular portion 35, and the cylindrical cam 5 is integrated with the cap. At that time, the protrusion 42 of the eraser holder 40 elastically fits into the spiral groove 36. (In order to fit the projection 42 into the spiral groove 36, there is an operation of fitting while rotating the crown 34 as appropriate.) As described above, when the cylindrical portion 34 of the crown is rotated to the left or right with respect to the cap 4, The eraser 46 appears and disappears from the end hole 38.

From that state, the cylindrical cam 5 is inserted into the rear end hole of the center shaft 1 so that the protrusion 17 is elastically fitted into the circumferential groove 19 and is rotatable in the circumferential direction with respect to the center shaft 1 by 180 degrees. Stop and stay in place. Further, with the mechanical pencil writing body approximately 7 protruding, the cap 4 is configured to be able to shift the stroke amount with respect to the center shaft 1 by the stroke required for centering, so that the writing body 8 such as a ballpoint pen projects when the writing body is stored. In this state, axis transition is disabled. Since the sliding pieces 6 and 6'are always urged rearward by the return springs 30 and 30 ', the cam slopes of the protrusions 22 and 22' are always kept in contact with the cam slope 14 of the cylindrical cam 5. ing.

Further, with the rear end surface of the front shaft 3 in contact with the front surface of the stepped portion 31 of the center shaft 1, the engagement portion 13 of the tubular portion 10 is elastically fitted into the engagement groove 12 of the front shaft 3. As a result, the front shaft 3 and the center shaft 1 are fixed in a rotation-preventing and retaining-prevention state. The front axle 3 can be attached and detached with an appropriate force. In this state, when the cap 4 is rotated to one side with respect to the front shaft 3 or the center shaft 1, the sliding comma 6 advances and the notch 15 at the front end of the cam slope 14 of the cylindrical cam 5 has one mechanical pencil writing body. The writing tip is locked to the projection 22 of the sliding piece 6 and the writing tip is projected from the tip end opening. When the cap 4 is rotated to the other side with respect to the leading shaft 3 or the center shaft 1, the sliding piece 6 is retracted, the writing tip of the mechanical pencil writing body 7 is retracted from the leading end of the leading spindle, and the sliding piece is moved. The 6 ”moves forward, and the writing tip of the writing body 8 such as the other ballpoint pen projects from the tip of the tip shaft.

3 and 4 show another corresponding example showing the engagement state between the protrusion 17 of the cylindrical cam and the center shaft 1 ". In this case, as a means for fitting the protrusion 17 into the circumferential groove 60, a partition wall 62 having an inclined surface 63 is provided on the upper wall of the guide groove 61 into which the protrusion 17 is fitted from the rear end of the center shaft 1 '. There is. The reason why the partition wall 62 is provided is to enhance the rigidity of the center shaft 1'at the engaging portion.

[0019]

[Action]

 When the cap 4 is rotated to one side with respect to the leading shaft 3 or the center shaft 1, as shown in FIG. 1, the notch 15 provided at the tip of the cam slope 14 of the cylindrical cam 5 causes the sliding member of one mechanical pencil writing body 7 to slide. 6 and the writing tip end thereof is projected from the tip end opening of the tip shaft. At this time, the protrusion 17 of the cylindrical cam 5 is located in the wide groove 49 in the circumferential groove 19 of the center shaft 1. In this state, when the rear end of the crown 34 is knocked and the cylindrical cam 5 moves axially, the motion is transmitted to the sliding top 6, the core pipe 23, and the mechanical pencil writing body 7, and the step 28 at the tip of the writing moves. The chuck is axially moved together with the joint 29 from the state where it is in contact with the inner step portion 27 of the leading shaft 3 and the lead is fed out. When the cap 4 is rotated to the other side with respect to the front shaft 3 or the center shaft 1, the mechanical pencil writing body 7 retracts, and instead, the writing tip of the writing body 8 such as a ballpoint pen projects from the tip of the leading shaft. When the cursive body such as a ball-point pen is projected or when the cursive body is projected, the protrusion 17 is located in the narrow groove 50 of the circumferential groove 19 and knocks to the step 21 of the cap 4 at the rear end of the center shaft 1. Since the projection 17 does not come into contact with the front wall 52 of the circumferential groove 19 in the abutting state, the projection or the like is not destroyed. Next, when the crown 34 is rotated to the left and right with respect to the front of the cap 4, the eraser holder 40 moves back and forth, and the eraser 46 appears and disappears from the rear end hole 38.

[0020]

[Effect of device]

 As described above, according to the present invention, the cylindrical portion having the slit is extended behind the cylindrical cam, the cylindrical cam is fitted into the resin cap, and the spiral groove is formed in the inner hole. The crown is attached to the cap while it is fitted on the cylindrical part of the cylindrical cam, and the cylindrical cam is fixed to the cap integrally, and the crown is fixed to the cap so that it can rotate only. Metal is replaced by resin, the number of parts is omitted, the structure is simplified, and the assembly is facilitated and the cost is reduced. Further, according to the embodiment, the center shaft integrally provided with the front shaft and the guide portion is made of a resin molded product, and the protrusion provided on the side surface of the cylindrical cam is elastically fitted into the circumferential groove formed at the rear of the center shaft, Further, since the center shaft is integrally provided with the engagement portion for joining with the front shaft and the cap, the number of parts is omitted as compared with the conventional double writing instrument, the structure is simplified, and the assembly is facilitated. Cost reduction is achieved. Further, even if an impact such as a rear end drop is applied, the protrusion that locks the cylindrical cam and the center shaft does not come into contact with the front wall of the circumferential groove, so problems such as damage are prevented.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of an essential part of the whole showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing an engagement state between a protrusion of a cylindrical cam and a circumferential groove of a center shaft.

FIG. 3 is an explanatory view showing another corresponding example of the engagement state between the protrusion of the cylindrical cam and the circumferential groove of the center shaft.

FIG. 4 is a cross-sectional view of an essential part of an engaging portion in FIG.

[Explanation of symbols]

 1 Middle shaft 1'Middle shaft 2 Guide cylinder 3 Tip shaft 4 Cap 5 Cylindrical cam 6 Sliding piece 6'Sliding piece 7 Mechanical pencil writing material 8 Writing material such as ballpoint pen 9 Guide groove 9'Guide groove 10 Cylindrical portion 11 Knock spring 12 Engagement Mating groove 13 Engagement portion 14 Cam slope 15 Notch 16 Partitioning portion 17 Protrusion 18 Vertical groove 19 Circumferential groove 20 Collar portion 21 Step portion 22 Protrusion 22 "Protrusion 23 Core pipe 24 Flange portion 25 Tail plug 26 Engagement portion 27 Inner step portion 28 step part 29 joint 30 return spring 30 'return spring 31 step part 32 hole 32' hole 33 engaging part 34 crown 34 'tubular part 35 tubular part 35' engaging part 36 spiral groove 37 slit 38 rear end hole 39 present Contact part 40 Eraser holder 41 Cylindrical part 42 Protrusion 43 Elastic piece 44 Locking protrusion 45 Step part 46 Eraser 47 Sloping surface 48 Isthmus 49 Habahiromizo 50 Habasemamizo 51a rear wall 51b inclined face 51c rear wall 52 front wall 60 peripheral groove 61 guide groove 62 partition wall 63 inclined surface

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 7, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 4]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (2)

[Scope of utility model registration request] 1. A guide cylinder and a guide which are integrated with the center shaft by respectively providing engaging portions for fitting the resin-made front shaft and the resin-made center shaft to the non-rotatable and slip-off preventive state. The cursive body is fitted in the guide grooves of the cylinder so that it can be moved back and forth by urging the return spring between the guide cylinder and the sliding piece. -Shaped cylindrical cam is rotatably prevented from moving relative to the guide cylinder or center shaft, and each sliding piece is brought into contact with the cam slope to cause the cylinder cam to rotate back and forth with respect to the leading shaft or center shaft, thereby alternately moving back and forth. In a compound writing instrument capable of selectively projecting and retracting the tip of each writing body from the tip opening of the tip shaft, a cylindrical portion having a slit 37 is integrally provided behind the cylindrical cam 5,
On the other hand, a spiral crown 36 made of resin has a spiral groove 36 formed in its inner hole, and a cylindrical portion 34 'is formed in the rear and a small diameter cylindrical portion 35 is formed in the front.
And a resin cap 4 for accommodating the cylindrical portion of the cylindrical cam 5 and a cylindrical portion 35 of the crown with the cylindrical portion of the cylindrical cam 5 fitted in the rear inner hole of the cap 4. Then, the cap 4 and the cylindrical cam 5 are integrated, the crown 34 is rotatably fixed to the cap 4, and the elastic portion for sandwiching the eraser 46 in the cylindrical portion of the cylindrical cam 5 and the front cylindrical portion 41. An eraser holder 40 having a protrusion 42 is attached with the protrusion 42 fitted in the slit 37 and the spiral groove 36, and the cap 4 is rotated with respect to the tip shaft 3 or the center shaft 1 so that the tip of the cursive body appears and disappears. , The cylindrical portion 34 of the crown 34 with respect to the cap 4
A compound writing instrument characterized in that the eraser 46 can be retracted and retracted by rotating the `. 2. A compound writing instrument according to claim 1, wherein at least one of the mechanical writing instruments is a mechanical pencil writing instrument, and a cylindrical cam is axially moved with respect to the center shaft and the guide cylinder to allow the lead to be drawn out. .