JP3500199B2 - Double writing instrument - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple writing instrument in which the tips of a plurality of writing bodies can be alternately projected and retracted at the front end of the front shaft and an eraser can be retracted and retracted from the rear end of the rear shaft.

[0002]

2. Description of the Related Art Heretofore, as an example of a compound writing instrument, as shown in Japanese Utility Model Application Laid-Open No. 64-3491 by the same applicant, a sliding groove for guiding two writing instruments is provided on the leading shaft. The front end has a guide cylinder fixed to the guide cylinder and a cam slope contacting the sliding pieces attached to the two cursive bodies fitted to the guide cylinder. It is equipped with a cylindrical cam that is movable in the axial direction and is integrally rotated in the circumferential direction.By rotating the cap with respect to the tip shaft, the two cursive writing bodies are selectively moved at the tip end opening of the tip shaft. There are multiple writing instruments that can appear and disappear.
Further, as seen in Japanese Patent Application Laid-Open No. 3-79397, there is a circumferential cam slant surface which is displaced in the axial direction at the rear end edge of the sliding piece, and a cam engaging projection that abuts against the slanting cam slant surface is formed in the inner hole portion of the cap. There is a double-sided writing instrument. Also, the actual development Sho 58-265
No. 89 and Japanese Utility Model Application Laid-Open No. 58-26577, there are known those having an eraser or other writing instrument at the rear end portion of the barrel. Also, as a conventional example, a double-type writing instrument in which another article such as an eraser or other writing instrument is replaceably provided at the rear end portion of a shaft cylinder is known by the same applicant in Japanese Utility Model Publication No. 2-28077.

[0003]

The above cited examples have the 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]

DISCLOSURE OF THE INVENTION The multiple writing instrument of the present invention devised to solve the above-mentioned problems is such that the tip of the resin-made tip shaft and the tip of the resin-made guide tube are in a non-rotatable and retaining state. The engaging parts to be fitted are respectively provided and both are fixed.
(As another measure, it is also possible to provide a threaded portion between them to join them.) Also, a plurality of cursive bodies in which sliding pieces are fixed to the rear ends of a plurality of guide grooves provided in the guide cylinder. Are fitted to each other via return springs so as to be movable back and forth, and a cam slope that is displaced in the axial direction is provided at the front end in a circular shape, and a flange is projectingly provided on the inner hole surface, and on the outer periphery of the rear end of the guide cylinder. The collar part was fitted in the provided circumferential groove, and the resin cam part was rotatably fixed to the guide cylinder. The rear shaft is attached to the rear of the guide cylinder so as to cover the guide cylinder and the cam portion, and the guide cylinder is configured so as to be rotatable with respect to the rear shaft to prevent the cam portion from rotating relative to the rear shaft. If the rear edge of the sliding piece is formed as a circumferential cam slope, the tip of the cam portion is formed by a rib-shaped front edge. When all the writing materials are ballpoint pens or the like, the cam portion can be formed integrally with the inner hole surface of the rear shaft or can be formed separately. At this time, the flange portion is integrally provided on the inner surface of the rear shaft or the cam portion. Further, the eraser feeding body includes a spiral cylinder having a spiral groove formed in the inner hole surface, and an inner cylinder having a slit portion which is inserted into the inner hole of the spiral cylinder and locked so as to be rotatable only relative to the spiral cylinder. A slider having a projection on its side and an eraser sandwiched in the inner cylinder is fitted into the inner cylinder, and the projection penetrates the slit portion and is engaged with the spiral groove. Further, a locking portion is formed in the rear end cylindrical portion of the cam portion or an inner hole of the rear shaft when integrally formed with the cam portion, and a locking portion is formed in the cylindrical portion of the inner cylinder front end of the eraser feeding body. Is formed, the mutual locking portions elastically engage with each other and are fixed to each other, and the rear end portion of the eraser feeding body is appropriately projected from the rear end of the rear shaft. With the above, by rotating the rear shaft with respect to the front shaft, each sliding piece is alternately moved in the front-rear direction so that the tip of each writing body can be selectively retracted from the front end of the front shaft. By the rotation, the projection is guided to the slit portion, and the slider slides in the axial direction, so that the eraser can appear and disappear from the rear end of the spiral cylinder. A step is formed on the eraser gripping piece of the slider, and a step is formed at the rear end of the inner hole of the spiral cylinder. Is projected from the rear end hole of the spiral cylinder, and the final state of the eraser can be confirmed. In addition, with at least one mechanical pencil as a writing body, the cam portion is provided so as to be axially shiftable with respect to the guide cylinder and the rear end of the spiral cylinder is knocked when the writing tip portion projects from the tip end opening of the leading shaft. This allows the cam portion to move axially to extend the lead.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings. The compound writing instrument of the present invention includes a guide cylinder 1, a front shaft 2, a cam portion 3, a rear shaft 4, a pair of sliding pieces 5, 5 ', a mechanical pencil writing body 6, a writing body 7 such as a ballpoint pen, and an eraser feeding body 34. The main component. First, as shown in FIG. 1, the guide tube 1 is made of resin and has an axially long guide groove 8 that is open to the side surface from approximately the center to the rear end, and the opposite side surface from the center to the rear. It has an axially long guide groove 8'opened to a position slightly forward of the end. In the first half of the guide tube 1,
A tubular portion 9 having a partitioning portion 15 having holes 15a and 15b in communication with the respective guide grooves 8 and 8'and having a front end opened is provided, and a flange portion 28 is provided on the outer peripheral portion near the rear end of the tubular portion 9. Further, a bulging engagement portion 12 is formed on the outer peripheral portion in front of the flange portion 28. Further, on a side surface slightly rearward of the rear end of the tubular portion 9, there is formed a circumferentially bulging engaging portion 27 'that fits into an engaging groove 27 of the rear shaft 4 described later. or,
A circumferential circumferential groove 16 is provided on the side surface of the rear end of the guide cylinder. (Same as the configuration of the tubular portion of the guide tube in Japanese Utility Model Laid-Open No. 64-3491)

The front shaft 2 made of resin is tapered at the front, and has a front end opening having an inner step portion 24 at the front end of the inner hole.
Further, the rear end hole is provided with an engaging groove 11 which is engaged with an engaging portion 12 provided on the outer peripheral portion of the tubular portion 9 of the guide tube and which prevents the guide tube 1 from coming off and is prevented from rotating. . The tubular portion 9 and the front shaft 2 are detachably fixed with an appropriate force. (Same as the configuration of the front axle in Japanese Utility Model Publication No. 64-3491)

The cam portion 3 is made of resin and has a tubular shape. The cam portion 3 has a cam slant surface 13 which is circumferentially displaced forward and backward at a front edge thereof, and a notch 14 is formed at the frontmost end portion of the cam slant surface 13. . Further, the side surface has a groove portion 3a to be fitted into a rib 4a of a rear shaft 4 which will be described later (see FIG. 2), and a fan-shaped (not shown) flange portion 17 is provided on the inner surface behind the cam slope 13. ing. or,
A rear end cylinder having a circumferential flange portion 33 on the rear outer periphery and further rearward.
A section 32 is provided. Further, on the outer circumference of the rear end tubular portion 32 , a locking portion in which a rib 32a, a groove portion 32c, and a rib 32b are formed in line is provided at a required position.

The rear shaft 4 made of resin has a cylindrical portion having substantially the same diameter as the front shaft 2 on the front side, and a shaft cylindrical portion 29 having a slightly larger diameter on the rear side, and a clip is formed on the rear end side surface of the shaft cylindrical portion 29. 30 are provided.
Further, an engagement groove 27, which is a groove in the circumferential direction, is provided on the inner surface portion of the front end of the front tubular portion, and the groove portion 3a of the cam portion 3 is provided on the inner surface portion at the rear thereof.
A rib 4a that is fitted to the rear shaft 4 is formed so that the cam portion 3 cannot rotate with the rear shaft 4 and can move along the axis.

The sliding member 5 made of resin has a protrusion 19 on the outer surface thereof, and the rear end face of the protrusion 19 has a central portion projecting on both sides thereof having substantially the same slope as the above-described cam slope 13 of the cam portion 3. It has a cam slope. In addition, the flange portion 21 of the core pipe 20
And a hole that abuts on the core pipe 20 and projects to the rear of the core pipe 20 for a long time to be fitted therein. A tail plug 22 is fixed to the rear end hole of the core pipe 20 to close the rear end hole. Like the sliding piece 5, the sliding piece 5'has a projection 19 'and a cam slope, and a locking portion 23 for fixing the rear end of the writing body 7 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 6 incorporates a general chuck mechanism, is joined to the core pipe 20 through a joint 6a connected to the chuck mechanism at the rear end, and has a flange portion 21 provided at the rear of the core pipe 20. The sliding piece 5 is fitted in contact with the sliding piece 5, and the rear end hole of the core pipe 20 protruding from the rear end of the sliding piece 5 is closed by the tail plug 22 as described above. The lead is extended by the tip step 25 of the mechanical pencil cursive body 6.
Is in contact with the inner step portion 24 of the front shaft 2, the cam portion 3
It is performed by sliding the chuck according to the axis transition of the sliding piece 5 in conjunction with.

The pencil pencil writing body 6 and the writing body 7 such as a ballpoint pen are connected to the respective sliding pieces 5 and 5'at their rear ends so as to be freely movable in the respective guide grooves 8 and 8'of the guide cylinder 1 described above. It is fitted and urged rearward by the return springs 26, 26 'interposed between the front end surfaces of the sliding pieces 5, 5'and the guide grooves 8, 8'of the guide cylinder 1 and the partition portion 15 on the front surface. It The cam portion 3 is elastically fitted into the circumferential groove 16 of the guide cylinder 1 so as to be rotatable in the circumferential direction with respect to the guide cylinder 1 so as to be prevented from coming off and fixed. Normally, the circumferential groove 16 and the flange portion 17 are dimensioned so that the cam portion 3 is prevented from rotating in a state in which each writing body is projected from the tip end opening of the tip shaft. Further, in the state where the mechanical pencil writing body 6 is projected, the circumferential groove position facing the collar portion 17 is formed to be wide enough for the stroke required for feeding the lead. Further, in a state in which the writing body 7 such as a ballpoint pen is projected, the circumferential groove position facing the flange portion 17 is formed narrowly in a state in which the cam portion 3 is advanced. Further, in a state in which each writing body is projected, the brim portion 33 is substantially in contact with the rib-shaped step portion 31 provided at a required position in the inner hole of the rear shaft 4 which faces the brim portion, and the brim portion due to a drop impact or the like. It is prevented that 17 directly contacts the front portion of the circumferential groove 16 and is damaged. In addition, sliding piece 5,
Since the 5 "is biased rearward by the return springs 26, 26", the cam slopes of the protrusions 19, 19 "are always kept in contact with the cam slope 13 of the cam portion 3.

The rear shaft 4 is attached by fitting the guide cylinder 1 and the cam portion 3, and the rear surface of the flange portion 28 of the guide cylinder 1 is in contact with the front surface of the rear shaft 4 and the protruding engagement portion 27. ｀ is elastically fitted in the engagement groove 27 of the rear shaft 4 so that the guide cylinder 1 is rotatable with respect to the rear shaft 4, and the rib 45 of the rear shaft 4 is provided in the groove 44 of the cam portion 3. The cam portion 3 is inserted into the cam portion 3 so that the cam portion 3 cannot rotate with respect to the rear shaft 4, but the shaft portion can freely move. Further, the front shaft 2 is fitted in the tube portion 9 of the guide tube 1, and the flange portion 28
With the rear end surface of the front axle 2 in contact with the front surface of the front axle 2, the engagement portion 12 of the tubular portion 9 is elastically fitted into the engagement groove 11 of the front axle 2,
Then, the guide cylinder 1 is fixed in the rotation-preventing and retaining-preventing state. The front shaft 2 can be attached and detached with an appropriate force.
In this state, when the rear shaft 4 is rotated to the one side with respect to the front shaft 2, the sliding piece 5 advances and the notch 14 at the foremost end of the cam slope 13 of the cam portion 3 slides on one mechanical pencil writing body 6. The writing tip is locked by the projection 19 of the moving piece 5 so that the writing tip projects from the tip end opening of the tip shaft. When the rear shaft 4 is rotated with respect to the front shaft 2 to the other side, the sliding piece 5 retracts, the writing tip of the mechanical pencil writing body 6 is retracted from the leading end of the leading axis, and the sliding piece 5'is moved forward. On the other hand, the writing tip of the writing body 7 such as the other ballpoint pen projects from the tip of the front shaft.

On the other hand, the eraser feeding body 34 is composed of a spiral cylinder 35, an inner cylinder 39, a slider 47 and an eraser 54 as shown in FIG. The spiral cylinder 35 has a circumferential locking groove 37 formed near the front end of the inner hole surface, and further has an axial spiral groove 36 formed behind it. Further, an inclined step portion 45 is circumferentially formed at the rear end of the inner hole to allow the eraser 54 to
The rear end hole through which the is projected penetrates.

The inner cylinder 39 has a step portion 42 on the front side, a circumferential locking projection 46 on the rear side close to the step portion 42, and a front side of the step portion 42.
The groove portion 41a, the protrusion 41c, and the groove portion 41 are formed on the inner hole surface of the cylindrical portion 41.
engaging portion having a b on the clear distinction is formed to the required position, forward
A slit portion 44 that penetrates from a front end step portion 43 to a rear end on a side surface of a rear tubular portion 40 that is integrally extended behind the tubular portion 41.
Are formed at two opposite positions, and an inclined step portion 45 is formed at a substantially rear end of the rear tubular portion 40 . In addition, the groove 4
The inlet of 1a is formed in a tapered shape.

The slider 47 has a cylindrical portion 48 at the front end thereof, and an eraser holding piece 49 which is elastically deformable is provided at two opposite positions extending to the rear end of the cylindrical portion 48. Further, a projection 50 is formed on each outer peripheral surface of the eraser holding piece 49 at a position where it can be engaged with the spiral groove 36, and a rear end portion 52 is formed having an inclined step portion 51 on the rear side. There is. Further, a protrusion locking portion 53 is formed on the inner peripheral surface.

Next, the slider 47 is fitted into the rear cylinder portion 40 of the inner cylinder 39, and the eraser holding piece 49 is fitted into the slit portion 44. Further, an eraser 54 is inserted and locked by the locking portion 53 of the eraser holding piece 49 in a biting manner. From that state, the inner cylinder 39 is fitted in the inner hole of the spiral cylinder 35, and the protrusion 50 of the slider 47 is inserted into the spiral groove 3.
6 is engaged. In addition, the locking projection 4 of the front cylinder portion 41 of the inner cylinder
6 is elastically engaged with the locking groove 37 of the spiral cylinder, and the step portion 42 is brought into contact with the front end of the spiral cylinder 35. Also, at that time, the rear tube portion 4
The stepped portion 45 of 0 comes into contact with the stepped portion 38 of the spiral cylinder 35 to prevent the slit portion 44 from being deformed in the diameter reducing direction. Inner tube 3
On the other hand, the spiral cylinder 35 is rotatable and non-pullable so that the eraser feeding body 34 is constituted. Further, by rotating the spiral cylinder 35 with respect to the inner cylinder 39, the projection 50 is formed into the slit portion 4.
The slider 47 slides in the axial direction by being guided by the guide 4.

Next, as shown in FIG. 2, the eraser feeding member 34 is inserted from the rear end hole of the rear shaft 4 and the front cylindrical portion of the inner cylinder.
The locking portion provided on the inner hole surface of 41 engages with the locking portion provided on the rear end cylindrical portion 32 of the cam portion 3 and is fixed to each other, and the rear end portion of the spiral cylinder 35 is located at the rear end of the rear shaft 4. It is formed to appropriately protrude from the end hole. Further, the eraser feeding body 34 can be attached to and detached from the cam portion 3. By the way, the groove portions 41a and 41b, which are the locking portions of the tubular portion 41, are fitted into the ribs 32a and 32b, which are the locking portions of the rear end tubular portion 32 of the cylindrical cam, so that they are mutually prevented from rotating, and the groove portion 32c is provided on the protrusion 41c. Is elastically fitted and prevented from coming off. Further, when the rear end tubular portion 32 and the front tubular portion 41 are mounted, the arrowhead portion (not shown) at the tip of the rib 32b is formed into the groove portion 4.
Since it faces the taper portion of the inlet of 1a, it is possible to smoothly meet without worrying about the mutual alignment.

[0018]

When the rear shaft 4 is rotated to one side with respect to the front shaft 2, the notch 14 provided at the tip of the cam slope 13 of the cam portion 3 makes the sliding member of one mechanical pencil writing body 6 as shown in FIG. 5 and the writing tip end thereof is projected from the tip end opening of the tip shaft. At this time, the flange portion 17 of the cam portion 3 is located in the wide portion of the circumferential groove 16. In this state, when the rear end of the eraser feeding body 34 is knocked and the cam portion 3 is axially moved, the motion is transmitted to the sliding piece 5, the core pipe 20, and the mechanical pencil writing body 6, and the step portion 25 at the writing tip portion is transmitted. Is the inner step portion 24 of the front axle 2.
From the state in which the chuck is in contact with the joint 6a, the chuck is further axially moved in conjunction with the joint 6a, and the core is extended. When the rear shaft 4 is rotated to the other side with respect to the front shaft 2, the mechanical pencil writing body 6 retracts, and instead, the writing tip portion of the writing body 7 such as a ballpoint pen projects from the leading shaft tip opening.

Next, when the rear end portion of the eraser feeding body 34 is rotated to one side with respect to the rear shaft 4, the projection 50 of the slider 47 moves along the slit portion 44 of the inner cylinder 39, so that the slider 47 gradually moves. Moves backward and the eraser 54 is fed out from the rear end hole of the spiral cylinder 35. When the rear end of the eraser feeding body 34 is rotated to the other side, the slider 4
7, the eraser 54 is retracted into the rear end hole of the spiral cylinder 35.

As shown in FIG. 4, when the eraser 54 is finished, the rear end of the eraser holding piece 49 is in contact with the step 38 of the spiral cylinder 35 at the rear end of the eraser 54 when the slider 47 is retracted. Since 52 is projected, the end of the eraser 54 can be seen. Further, an engaging portion 53 with an eraser is provided on the inner surface of the protruding rear end portion 52, and an appropriate chamfer is provided at the edge of the rear end hole of the spiral cylinder 35 so that the rear end portion 52 can be easily deformed in the expanding direction. If not done (not shown), it is easy to take out the remaining eraser and attach a new eraser.

[0021]

According to the present invention, as shown in the embodiment, the metal is replaced by the resin as compared with the conventional example, the number of parts is omitted, the structure is simplified, and the assembly is facilitated and the cost is reduced. . Further, the present invention is extremely useful because the eraser feeding member is detachably accommodated at the rear end of the rear shaft so that the function is increased and the eraser feeding member can be used properly according to the purpose. That is, there is an advantage that application units other than the eraser can be freely attached. Also, with the advantage that you can see when the eraser is finished,
It has the effect of easily replacing the eraser.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view showing an embodiment of the present invention, in which a part of a main part is non-cross-section.

FIG. 2 is an enlarged cross-sectional view of the latter half of FIG.

FIG. 3 is a vertical sectional view of an eraser feeding body.

FIG. 4 is a cross-sectional view of essential parts showing a state when the eraser is finished.

[Explanation of symbols]

1 Guide cylinder 2 Front shaft 3 Cam part 3a Groove part 4 Rear shaft 4a Rib 5 Sliding piece 5 "Sliding piece 6 Mechanical pencil writing material 6a Joint 7 Writing material such as ballpoint pen 8 Guide groove 8" Guide groove 9 Tube portion 10 Knock spring 11 Engagement Groove 12 Engagement Part 13 Cam Bevel 14 Notch 15 Partition 15a Hole 15b Hole 16 Circumferential Groove 17 Collar 18 Through Hole 19 Protrusion 19 Protrusion 20 Core Pipe 21 Flange 22 Tail Plug 23 Engagement 24 Inner Stage Part 25 Step part 26 Return spring 26 'Return spring 27 Engagement groove 27' Engagement part 28 Flange part 29 Shaft cylinder part 30 Clip 31 Step part 32 Rear end cylinder part 32a Rib 32b Rib 32c Groove part 33 Collar part 34 Eraser extruding body 35 spiral cylinder 36 spiral groove 37 locking groove 38 step 39 inner cylinder 40 rear cylinder 41 front cylinder 41a groove 41b groove 41c protrusion 42 Step portion 43 Step portion 44 Slit portion 45 Step portion 46 Locking protrusion 47 Slider 48 Tube portion 49 Eraser gripping piece 50 Protrusion 51 Step 52 Rear end portion 53 Locking portion 54 Eraser

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B43K 24/14 B43K 24/18 B43K 29/02

Claims (2)

(57) [Claims] 1. A plurality of writing bodies in which a resin-made front shaft and a front portion of a guide cylinder are detachably fixed, and a sliding piece is fixed to a rear end of a plurality of guide grooves provided in the guide cylinder. A return spring is urged between the guide cylinder and the sliding piece so that they can be moved back and forth in the axial direction, and the rear of the guide cylinder is covered to rotate the resin rear shaft around the guide cylinder. The cam part is fixed to the inside of the rear shaft, and the cam part is stopped from rotation with a resin member that is integral with or separate from the rear shaft. The flange part provided in the hole is fitted to fix the cam part to the guide cylinder in a rotatable state, and the cam part is axially displaced to either the front end edge of the cam part or the rear end edge of the sliding piece. By providing a circumferential cam bevel and contacting the front edge of the cam part with the rear edge of the sliding piece, the rear shaft rotates with respect to the front shaft. By alternately moving each sliding piece back and forth, the tip of each writing body can be selectively retracted from the tip opening of the tip shaft, and the front writing part and the rear end of the cam part or detachably fixed in the rear shaft In the double- sided writing instrument provided with a rear eraser feeding body capable of retracting and erasing the eraser by rotating the rear end portion, the eraser feeding body has a spiral groove formed in the inner hole surface.
And the spiral tube inserted into the inner hole of the spiral tube
An inner cylinder having a slit portion that locks only in a rotatable manner,
It is fitted in the inner cylinder and has an eraser on the side with the eraser sandwiched in between.
Slidable protrusion that penetrates the slit and is engaged with the spiral groove.
The inner cylinder is composed of an idler, and the inner cylinder is a step portion with which the front end of the spiral cylinder abuts and the front thereof.
A locking part consisting of a groove and a protrusion is provided on the inner hole surface of the rectangular tube.
And the side of the rear tubular portion integrally extending behind the front tubular portion
A slit part that penetrates to the rear end is provided on the surface,
An inclined step is formed at the rear end of the rear tubular part to form a spiral tube.
Of the rear cylindrical portion on the inclined step formed at the rear end of the inner hole of
The slit step changes in the direction of diameter reduction as the slanted step portion comes into contact.
It is possible to prevent it from being shaped, and the eraser feeding body is installed on the rear end cylinder part behind the cam part.
The locking provided on the front cylinder part of the inner cylinder on the locked part
The parts are locked and fixed to each other.
The rear end projects from the rear end hole of the spiral cylinder and the eraser's final shape
Double type characterized by being configured to check the condition
Writing instrument. 2. The cam portion is a cam portion 3 which is separate from the rear shaft 4, and the cam portion 3 is attached to the rear shaft 4 only in the sliding direction, and the rear portion of the rear shaft 4 is located behind the cam portion 3. A flange portion 33 is provided so as to face the step portion 31 of the hole, and further the rear end tubular portion 3 behind the flange portion 33.
2 is provided with a locking portion, and the eraser feeding body 34 is provided in front of
The cam portions 3 are fixed in such a manner that the locking portions provided on the tubular portion 41 are fixed to each other and at least one of them is used as a mechanical pencil writing body, and the writing tip portion thereof projects from the tip end tip opening. It provided relative to the guide tube 1 so as to be axially transition, characterized in that it is configured so that the cam portion 3 and the shaft transition becomes possible feeding of the core by knocking the rear end of the eraser 34 according Double writing according to item 1
Ingredient