JPH07290884A - Double cartridge writing tool - Google Patents

Abstract

PURPOSE:To make it possible to thrust an eraser by a tool wherein an eraser holder is fixed on a cylinder part in the rear of a cylindrical cam and an inner cylinder is rotatably fitted on the outer periphery of the cylinder part and a rotation operating part is provided on the outer peripheral part of an projected part on the rear end of the inner cylinder. CONSTITUTION:An eraser holder 37 wherein an eraser 42 is fixed is inserted in the cylindrical part of an cylindrical cam 3 projected long from the rear end of an rear shaft 29 and the projection 38 of the eraser holder 37 is inserted into a slit part 33 provided on the cylindrical cam 3 to make the eraser holder 37 no rotatable and freely slidable on the cylindrical part of the cylindrical cam 3. An inner cylinder 31 is made to be freely rotatable and is fixed without pulling out to the cylindrical part of the cylindrical cam 3 and the projection 38 of the eraser holder 37 is inserted into a spiral channel 34 of the inner cylinder 31. In addition, a rotation operating part 32 of the inner cylinder 31 is projected from the rear end of the rear shaft 29. As the result, when the rotation operating part 32 is rotated to the rear shaft 29, the eraser 42 is moved in and out from the opening of the rear end of the inner cylinder 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double 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 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. Further, as a cited example of the present application, there is a compound writing instrument in which an eraser is projected and retracted by rotating a crown protruding from a rear end of a cap, as seen in Japanese Utility Model Laid-Open No. 120889/1985. .

[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 flange is fitted in the provided circumferential groove, and the resin-made cylindrical cam is rotatably and securely attached to the guide cylinder. Attach the center shaft with the guide cylinder covered and the rear shaft rotatably only to the rear end outer periphery of the center shaft with the cylindrical cam covered. This means that the shaft cannot be rotated. Also, a long cylindrical portion is provided behind the cylindrical cam, the cylindrical portion is projected from the rear end of the rear shaft, and a slit portion is provided in the cylindrical portion. It was fitted in the tubular part with the slit fitted in the slit part. Further, a resin eraser holder having an eraser attached to the rear is attached to the cylindrical portion having the slit portion by inserting a protrusion provided on the outer periphery thereof into the slit portion, and an inner hole portion is formed on the outer periphery of the cylindrical portion. A resin-made inner cylinder with a spiral groove is fitted into the outer periphery of the cylinder part so that it can only rotate, and the protrusion of the eraser holder is fitted into the spiral groove. A rotation operation part is provided by projecting from the end appropriately, and by rotating the rear shaft 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 of the front shaft. The eraser can be retracted from the rear end of the inner cylinder by the rotation of the rotary operation portion with respect to the rear shaft. Also, the cylindrical cam is integrally attached to the rear shaft only in the rotational direction,
At least one of them is a mechanical pencil writing instrument, and with the writing tip part protruding from the tip end tip opening, a cylindrical cam is provided so that it can move axially with respect to the guide cylinder, and the rear end of the inner cylinder is knocked. This means that the core of the cylindrical cam can be extended by shifting its axis.

[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 cylindrical cam 3, a middle shaft 4, a rear shaft 29, a pair of sliding pieces 5, 5 ', a mechanical pencil writing body 6, a writing body 7 such as a ballpoint pen, an inner cylinder. 31, the eraser holder 37, and the eraser 42 are main components. First, the guide cylinder 1 is made of resin, and as shown in FIG.
It has a long guide groove 8 in the axial direction that is open to the side surface from approximately the center to the rear end, and a guide groove 8 ″ that is long in the axial direction and opens to the front end of the rear end from the center to the side surface on the opposite side. Have In the first half of the guide tube 1, the guide grooves 8 and 8 '
A tubular portion 9 having a partition portion 15 having holes 41, 41 'communicating with the front end and having a front end opened is provided, and a flange portion 28 is formed on the outer peripheral portion near the rear end of the tubular portion 9, and 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 an inner shaft 4 described later. A circumferential circumferential groove 16 is provided on the side surface of the rear end of the guide cylinder. (Actual exploitation 64
(It has the same structure as the tube portion of the guide tube disclosed in Japanese Patent No. 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 cylindrical cam 3 is made of resin and has a cylindrical shape. The front end of the cylindrical cam 3 has a cam slope 13 which is circumferentially displaced forward and backward, and a notch 14 is formed at the foremost end of the cam slope 13. . or,
The side surface has a required number of ribs 3a to be fitted into guide grooves 29b of a rear shaft 29, which will be described later, and a fan-shaped flange portion 17 is provided on the inner surface behind the cam slope 13. Further, a long slit portion 33 is formed in a tubular portion which has a circumferential flange portion 35 on the rear outer periphery and extends further rearward.

The resin rear shaft 29 has a shaft cylinder part with a slightly larger diameter, and a clip 30 is provided on the rear end side surface of the shaft cylinder part. In addition, a projection 29a is provided on the peripheral wall of the front inner hole, and a required number of guide grooves 29b are formed on the rear inner wall thereof.
On the other hand, a collar portion 4a is formed in the vicinity of the rear end of the resin-made center shaft 4, and a circumferential engagement groove 4b is further formed in the outer peripheral portion of the rear end. The protrusion 29a of the rear shaft 29 is elastically fitted into the engagement groove 4b, and is fixed to the center shaft 4 so as to be rotatable only. The rib 3a of the cylindrical cam 3 is fitted in the guide groove 29b so that the cylindrical cam 3 cannot rotate with respect to the rear shaft 29 and can move axially.

The sliding member 5 made of resin has a protrusion 19 on the outer surface, and the rear end face of the protrusion 19 has a central portion projecting and both sides thereof have substantially the same slope as the cam slope 13 of the cylindrical cam 3 described above. It has a cam slope. In addition, the flange portion 2 of the core pipe 20
1 is provided, and a hole is provided that is fitted to the core pipe 20 so that the core pipe 20 protrudes rearward for a long time. 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 inner cylinder 31 is made of resin, and a spiral groove 34 is formed on the inner surface of the cylinder portion, and a projection 44 is provided on the inner surface of the tip of the cylinder portion and a circumferential groove 36 is provided on the rear portion thereof. The protrusions 44 are appropriately provided on the entire circumference or on a required portion. Further, the rotation operation part 32 having a slightly bulged shape is formed on the outer periphery of the substantially rear end of the cylindrical part.
Is provided. Further, the eraser holder 37 is provided with a bottomed hole portion for abutting the rear end of the eraser 42 on the rear end,
A protrusion 38 is formed on the outer peripheral portion of the front end, an elastic piece 39 and an engaging protrusion 40 are formed on the inner surface of the elastic piece 39 on the outer peripheral portion of the rear end, and the rear end of the eraser 42 is sandwiched between the elastic pieces 39. To wear.

The mechanical pencil writing body 6 incorporates a general chuck mechanism, is joined to the core pipe 20 through a joint 43 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 brought into contact with the inner step portion 24 of the front shaft 2, and the chuck is slid by the axial movement of the sliding piece 5 in conjunction with the cylindrical cam 3.

The mechanical 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. 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 cylindrical cam 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 cylindrical cam 3 is prevented from rotating in a state in which each writing body projects from the tip end opening of the tip shaft.
Also, with the mechanical pencil writing material protruding, the collar 1
The circumferential groove position facing 7 is formed to be wide enough for the stroke required for feeding the core. Further, since the sliding pieces 5, 5'are urged 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 cylindrical cam 3. ing.

The center shaft 4 covering the guide cylinder 1 is fitted with the cylindrical cam 3 and the rear shaft 29 is rotatably attached to the outer peripheral portion of the rear end of the center shaft 4, and the rear surface of the flange portion 28 of the guide cylinder 1 is covered. Is in contact with the front surface of the rear shaft 4, the projecting engagement portion 27 'is elastically fitted into the engagement groove 27 of the center shaft 4 to prevent the guide cylinder 1 from coming off the center shaft 4, In addition, a rotation stopper (not shown) is provided between them to be fixed. Further, the rib 3a of the cylindrical cam 3 is fitted into the guide groove 29b of the rear shaft 29, so that the rear shaft 29
On the other hand, the cylindrical cam 3 is non-rotatable but is configured so that its axis can move freely. Further, the front shaft 2 is fitted in the cylinder portion 9 of the guide cylinder 1, the rear end surface of the front shaft 2 is in contact with the front surface of the flange portion 28, and the engaging portion 12 of the cylinder portion 9 is connected to the front shaft 2. The front shaft 2 and the guide cylinder 1 are elastically fitted in the engagement groove 11 so that the front shaft 2 and the guide cylinder 1 are fixed in a rotation-stopping and slip-out preventing state. The front shaft 2 can be attached and detached with an appropriate force.

In this state, when the rear shaft 29 is rotated to one side with respect to the center shaft 4, the sliding piece 5 advances and the notch 14 at the front end of the cam slope 13 of the cylindrical cam 3 has one mechanical pencil writing body 6. The writing tip is locked to the projection 19 of the sliding piece 5 and the writing tip is projected from the tip end opening. When the rear shaft 29 is rotated to the other side with respect to the center shaft 4, 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. The writing tip portion of the writing body 7 such as the other ballpoint pen projects from the tip end opening of the tip shaft.

On the other hand, the eraser holder 37 having the eraser 42 fixed therein is inserted into the cylindrical portion of the cylindrical cam 3 protruding long from the rear end of the rear shaft 29, and the protrusion 3 of the eraser holder 37 is inserted.
8 is fitted in the slit portion 33 provided in the cylindrical portion of the cylindrical cam 3, and the eraser holder 37 is formed so as to be non-rotatable and slidable on the cylindrical portion of the cylindrical cam 3. Further, the inner cylinder 31 is fitted into the cylindrical portion of the cylindrical cam 3 and the collar portion 35 of the cylindrical portion is elastically fitted into the groove 36, so that the inner cylinder is inserted into the cylindrical portion of the cylindrical cam 3. While 31 is rotatably fixed and prevented from coming off, the projection 38 of the eraser holder 37 is fitted into the spiral groove 34 of the inner cylinder 31. Further, the rotation operation part 32 of the inner cylinder 31 is positioned so as to appropriately protrude from the rear end of the rear shaft 29. As described above, when the rotation operation portion 32 is rotated with respect to the rear shaft 4, the eraser 42 appears and disappears from the rear end opening of the inner cylinder 31.
The inner diameter of the opening of the inner cylinder 31 is slightly larger than the outer diameter of the eraser 42.

[0016]

When the rear shaft 29 is rotated to one side with respect to the center shaft 4,
As shown in FIG. 1, the notch 14 provided at the tip of the cam slope 13 of the cylindrical cam 3 engages with the sliding piece 5 of one mechanical pencil writing body 6 to project the writing tip from the tip end opening of the tip shaft. . At this time, the flange portion 17 of the cylindrical cam 3 is located in the wide portion of the circumferential groove 16. When the rear end of the inner cylinder 31 is knocked in this state and the cylindrical cam 3 is axially moved, the movement 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 tip of the writing moves. From the state in which the chuck is in contact with the inner step portion 24 of the tip shaft 2, the chuck is further axially moved in association with the joint 43, and the core is fed. When the rear shaft 29 is rotated to the other side with respect to the center shaft 4, the mechanical pencil writing body 6 retreats, and instead, the writing tip portion of the writing body 7 such as a ballpoint pen projects from the tip tip opening.

Next, when the rotation operating portion 32 of the inner cylinder 31 is rotated to one side with respect to the rear shaft 29, the projection 38 of the eraser holder 37 moves along the spiral groove 34 of the inner cylinder 31, so that it gradually becomes larger. The eraser holder 37 retracts, and the eraser 42 is fed from the rear end opening of the inner cylinder 31. Further, when the rotation operating portion 32 is rotated to the other side, the eraser holder 37
Moves forward, and with this, the eraser 42 sinks from the rear end opening.

[0018]

As shown in the embodiments of the present invention, a resin-made inner cylinder in which a cylindrical portion having a slit portion is integrally extended behind a cylindrical cam and a spiral groove is formed in an inner hole portion is provided. By being attached to the tubular portion only for rotation, the rear end of the inner cylinder appropriately protrudes from the rear end of the rear shaft, and the rotation operating portion is provided on the outer periphery thereof.
Compared to the conventional example, metal is replaced with resin, the number of parts is omitted, the structure is simplified, and the assembly is facilitated and the cost reduction is achieved. Further, since the cursive body is projected and retracted by rotating the rear shaft with respect to the center shaft, the rotating operation is easy. It is also possible to perform the rotating operation with one hand. Further, since the mechanical pencil can be drawn out by knocking the rear end of the inner cylinder with respect to the rear shaft, the knocking operation is easy for the one in which the rear shaft moves axially. As described above, the operability is superior to the conventional example.

[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 a main part in FIG.

[Explanation of symbols]

 1 Guide cylinder 2 Tip shaft 3 Cylindrical cam 3a Rib 4 Middle shaft 4a Collar part 4b Engagement groove 5 Sliding piece 5 "Sliding piece 6 Mechanical pencil writing material 7 Ballpoint pen writing material 8 Guide groove 8" Guide groove 9 Cylindrical portion 10 Knock spring 11 Engagement groove 12 Engagement portion 13 Cam slope 14 Notch 15 Partition portion 16 Circumferential groove 17 Collar portion 18 Through hole 19 Protrusion 19 "Protrusion 20 Core pipe 21 Flange portion 22 Tail plug 23 Locking portion 24 Inner step portion 25 Step part 26 Return spring 26 'Return spring 27 Engagement groove 27' Engagement part 28 Flange part 29 Rear shaft 29a Projection part 29b Guide groove 30 Clip 31 Inner cylinder 32 Rotating operation part 33 Slit part 34 Spiral groove 35 Collar part 36 groove 37 Eraser holder 38 Protrusion 39 Elastic piece 40 Locking protrusion 41 Hole 41 'Hole 42 Eraser 43 Splice 44 projections

Claims (2)

[Claims] 1. A plurality of guide shafts made of resin and a guide tube made of resin are detachably fixed, and a plurality of guide grooves provided in the guide cylinder are provided with sliding slides fixed to the rear end thereof. The cursive body is fitted between the guide cylinder and the sliding piece by a return spring so that it can be moved back and forth in the axial direction. Fixed to the rear end of the center shaft, the rear shaft is rotatably attached to the rear end, and the cylindrical cam is stopped from rotating in the inner hole of the rear shaft. A flanged portion provided on the inner wall of the cylindrical cam is fitted into the groove to fix the cylindrical cam in a rotatable state with respect to the guide cylinder, and a circumferential cam that is axially displaced to the front end edge of the cylindrical cam. By providing a beveled surface and contacting the front edge of the cylindrical cam with the rear edge of the sliding piece, alternating by rotation of the rear shaft with respect to the center shaft In a compound writing instrument in which each sliding piece is moved back and forth so that the tip of each writing body can be selectively retracted from the tip opening of the tip shaft, a slit portion is formed in the cylindrical portion extending behind the cylindrical cam. An eraser holder, in which an eraser is attached to the rear portion of the cylindrical portion, is attached by fitting a protrusion provided on the outer periphery of the holder into the slit portion of the cylindrical portion. The inner cylinder made of resin provided with is fitted rotatably to the outer circumference of the cylinder part, the protrusion of the eraser holder is fitted into the spiral groove, and the rear end of the inner cylinder is the rear end of the rear shaft. A rotating operation part is provided by appropriately projecting from it, and by rotating the rear shaft 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 of the front shaft. The eraser by rotating the rotary operation part with respect to the rear shaft. Multiplex writing implement, characterized in that the retractable from the edge. 2. The cylindrical cam is integrally attached only in the rotational direction with respect to the rear shaft, and at least one is used as a mechanical pencil writing body, and the cylindrical tip is in a state in which the writing tip portion projects from the leading shaft tip opening. The cam is provided so as to be axially shiftable with respect to the guide cylinder, and by knocking the rear end of the inner cylinder, the cylindrical cam is axially shiftable to allow the lead to be drawn out. The double-sided writing instrument described in 1.