JPH09156287A - Combined type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a simple structure, easy assembly and consequent reduction of the cost, to achieve versatility in design and also to facilitate operations of projection and withdrawal of a writing body and a rubber eraser. SOLUTION: A slider 36 equipped with an engaging projection being deformable elastically in the direction of the axis of a holder and with a rubber eraser 43 at the rear end is inserted into a tube part 37 and the engaging projection 40 is made to engage with an engaging part. Moreover, a rear holder 4 covering the tube part 37 is fitted to the rear part of the middle holder so that it can only rotate. The rear holder 4 and the tube part 37, i.e., a cylindrical cam 5, are put in engagement integrally in the direction of rotation. On the lateral side of the rear holder 4, a window part 4C is provided on the same side as a slit 33 and an operating button 39 in linkage with the engaging projection 40 is exposed appropriately from the window part. While the state of engagement of the engaging projection 40 with the slit 33 is canceled by pressing the operating button, the slider 36 is moved backward and the rubber 43 is projected from the rear end of the rear holder 4.

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 retracted 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 Conventionally, as an example of a double-type 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 objects is provided on a front shaft. The front end has a guide tube fixed to the guide tube and a cam slope contacting a sliding piece attached to two writing bodies fitted to the guide tube, and the rear end forms a knock portion to the cap. Equipped with a cylindrical cam mounted so as to be movable in the axial direction and integrated in the circumferential direction, and by selectively rotating the cap with respect to the front shaft, two writing bodies can be selectively placed at the front end of the front shaft. There are multiple writing instruments that can appear and disappear.
In addition, as a conventional example, the applicant of the present invention, Shokai 60-120
As disclosed in Japanese Patent Application Laid-Open No. 889, there is a double-type writing instrument in which a crown protruding from a rear end of a cap is rotated to make an eraser appear and disappear.

[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. Also, since the cap is long with respect to the tip shaft, there is a problem in flexibility in design. When the cursive body is retracted, one hand grasps the shaft tip and the other hand grasps the shaft rear end to perform rotation operation. Therefore, there is a drawback that it is not easy to use.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the compound writing instrument of the present invention has a guide portion integrally fixed to the center shaft by fixing the front ends of the front shaft and the center shaft in a non-rotatable and retaining state. A plurality of cursive bodies with sliding tops fixed to the rear end are urged by return springs between the guide part and the sliding tops so that they can be moved back and forth in the axial direction, respectively, and are displaced in the axial direction. A cylindrical cam having a cam slope at the front end is rotatably prevented from rotating with respect to the center shaft within a certain range, and each sliding piece is brought into contact with the cam slope of the cylinder cam, so that In a compound writing instrument in which each sliding piece is alternately moved in the front-rear direction by rotation so that the tip of each writing body can be selectively retracted from the tip end opening of the front shaft, a cylindrical portion is integrated behind the cylindrical cam. Is provided on the cylindrical slit and a step on the inner surface of the slit. An engaging portion is provided, the other hand,
A slider provided with an engaging projection that is elastically displaceable in the axial direction and having an eraser fixed at the rear end is fitted into the tubular portion, and the engaging projection penetrates into the slit and is attached to the engaging portion. An engagement projection is provided so as to be locked, and further, the rear shaft is covered by the rear part of the center shaft so as to be rotatable only while covering the cylindrical part, and the rear shaft and the cylindrical part, that is, the cylindrical cam are integrally formed in the rotation direction. Engaged, a window portion is formed on the side of the rear shaft on the same side as the slit, an operation button that interlocks with the engagement protrusion is appropriately penetrated from the window portion, and by pressing the operation button, It is characterized in that the slider is moved rearward while releasing the locked state between the engaging projection and the engaging portion of the slit so that the eraser projects from the rear end of the rear shaft. From the above,
Since the compound writing instrument of the present invention has a simple structure with a reduced number of parts, it is easy to assemble and the cost can be reduced.
In addition, since the rear shaft (cap) can be set to an appropriate length, there is flexibility in design and rotation operation becomes easy. Further, since the cursive body retracting operation is a rotary type and the eraser retracting operation is a sliding type, the operation is differentiated and no malfunction occurs.

[0005]

1 to 4 show an embodiment of the present invention. The compound writing instrument of the example is a center shaft 1 integrally provided with a guide cylinder 2, a tip shaft 3, a cylindrical cam 5, a pair of sliding pieces 6, 6 ', a mechanical pencil writing body 7, a writing body 8 such as a ballpoint pen, and a rear body. The shaft 4, slider 36, and eraser 43 are the main constituent elements. First, as shown in FIG. 1, the inner shaft 1 is made of resin, and as shown in FIG. A guide tube 2 (guide portion) having a 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. Step 3
1 has a bulging engagement portion 1 on the front outer peripheral portion of the step portion 31.
3 are formed. It is also possible to form a rib or a partition part integrally on the inner circumference of the center shaft 1 to form a guide part for guiding the sliding piece.

Further, as shown in FIG. 2, a vertical groove 18 is connected to a peripheral groove 19 through a front inclined surface 50 on a rear side surface of the center shaft 1, and a substantially L-shaped window portion is formed. Has been drilled. 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 50, passes through the narrow portion 51, and enters the circumferential groove 19. The cylindrical cam 5 rotates while the projection 17 abuts on the rear wall of the circumferential groove 19 in the circumferential direction, so that the writing part of the writing body 8 such as the mechanical pencil 7 or the ballpoint pen alternately protrudes and retracts from the front end of the front shaft. Become. Further, the circumferential groove 19 is provided with a wide groove 52 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. The rear wall 54 of the circumferential groove 19 so that the cylindrical cam 5 cannot substantially move along the axis at the position of the protrusion 17 when protruding.
A narrow groove 53 is provided by connecting the inclined surface 54b between a and the rear wall 54c. Further, as will be described later, it is set so that the step portion 20a of the cylindrical cam 5 contacts the rear end of the center shaft 1 and the front end of the protrusion 17 does not contact the front wall 55 of the circumferential groove 19 at the front end of the axial transition. .

[0007] The front end of the shaft 3 is tapered, and the front end of the shaft 3 has an inner step 27 at the end of the inner hole. Further, the rear end hole is provided with an engaging groove 12 which is engaged with an engaging portion 13 provided on the outer peripheral portion of the tubular portion 10 of the guide tube and which prevents the tubular portion 10 from coming off and rotation. . The cylindrical portion 10 and the front shaft 3 are detachably fixed by an appropriate force. (Showa 6
(The same as the structure of the front shaft of Japanese Patent No. 4-3491) The connection between the front shaft 3 and the center shaft 1 may be screw connection.

The cylindrical cam 5 has a cylindrical shape and has a cam slant surface 14 which is circumferentially displaced forward and backward at a front edge thereof, and a notch 15 is formed at a frontmost end portion of the cam slant surface 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). . Further, the cylindrical cam 5 has a cylindrical portion 20 extending behind the step portion 20a,
A slit 33 is formed on one side surface of the tubular portion 20.
Further, the protrusions 34 and the grooves 35 are alternately formed on the inner surface of the slit 33.
Is provided with an engaging portion.

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, a hole is provided which abuts against the flange portion 24 of the core pipe 23 to protrude and fit the rear of the core pipe 23 long. The sliding piece 6 # has a projection 22 # and a cam slope like the sliding piece 6, and a locking portion 26 for fixing the rear end of the writing body 8 such as a ball-point pen is provided at the tip. Incidentally, the locking portion may be formed in a pipe shape and the rear end of the writing body may be fitted.

The mechanical pencil writing body 7 has a built-in general chuck mechanism and is joined to the core pipe 23 via a joint 29 connected to the chuck mechanism at the rear end, and a flange portion 24 provided at the rear of the core pipe 23. The sliding piece 6 is fitted in contact with the sliding piece 6, 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 leading of the lead is performed by moving the chuck by the axial movement of the sliding piece 6 in a state where the step 28 at the tip end of the mechanical pencil 7 is in contact with the inner step 27 of the front shaft 3.

By the way, in the center shaft 1, a circumferential flange portion 1a is formed on the front side surface of the circumferential groove 19 as appropriate, and a protruding locking portion 1b is formed near the rear portion of the flange portion 1a. A circumferential groove-shaped engaging portion 4b is formed in the front end inner hole of the rear shaft 4, and an axial groove 4a is formed in the rear inner hole. Further, an axial rib 21 is also formed on the peripheral surface of the cylindrical portion 20 behind the cylindrical cam. The rear shaft 4 is fitted and inserted so as to cover the tubular portion 20, the rib 21 is fitted into the groove 21, and the locking portion 1b is elastically engaged with the locking portion 4b. Above,
The rear shaft 4 is fixed to the center shaft 1 so as to be rotatable only, and the cylindrical cam 5 is stopped to rotate relative to the rear shaft 4 so as to be movable back and forth.

On the other hand, in the slider 36, an elastic piece 38 is provided on one side surface of the cylindrical portion 37, and an operation button 39 having an engaging projection 40 elastically displaceable in the axial direction is formed at one end of the elastic piece 38. ing. An eraser 43 is provided at the rear end of the tubular portion 37.
Is fastened. The slider 36 is provided so as to be fitted and inserted into the tubular portion 20, the engagement projection 40 extending through the slit 33, and the engagement projection 40 being locked to the engagement portion on the inner surface of the slit. The cylindrical portion 20 is covered and the rear shaft 4 is fixed to the rear of the center shaft 1 so as to be rotatable only.

Further, a window portion 4c is formed on the side surface of the rear shaft 4 on the same side as the slit 33, and an operation button 39 which interlocks with the engaging projection is appropriately protruded from the window portion 4c. By pressing the operation button 39, the slider 36 is moved rearward while releasing the locked state between the engagement protrusion 40 and the engagement portion of the slit 33, and the eraser 43 projects from the rear end of the rear shaft 4. It is configured. Further, the crown 41 is fixed to the rear end portion 20b of the tubular portion 20.

Explaining in the order of assembling, the mechanical pencil writing body 7 and the writing body 8 such as a ball-point pen are connected to the respective sliding pieces 6 and 6'at their rear ends so that each of the guide rods 2 of the above-mentioned center shaft is connected. The guide groove 9, 9'is movably fitted to the front end surface of each sliding piece 6, 6'and the partition portion 1 on the front side of the guide groove 9, 9 '.
It is urged backward by the return springs 30 and 30 'which are interposed between the 6 and 6. Subsequently, the cylindrical cam 5 is inserted into the rear end hole of the center shaft 1 and the projection 17 is elastically fitted into the circumferential groove 19 so as to be rotatable about 180 degrees in the circumferential direction with respect to the center shaft 1 and to be prevented from coming off. Be fastened. Further, the cylindrical cam 5 can be moved back and forth by the stroke required for centering the core 1 with the mechanical pencil writing body 7 protruding, and the writing body 8 such as a ballpoint pen projects when the writing body is stored. It is made impossible to move back and forth. Since the sliding pieces 6, 6'are always urged rearward by the return springs 30, 30 ', the cam slopes of the protrusions 22, 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 in 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-stopping and slip-out preventing state. The tip shaft 3 is detachable with an appropriate force. In this state, when the cylindrical cam 5 is rotated to one side with respect to the front shaft 3 or the center shaft 1, the sliding piece 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 by the projection 22 of the sliding piece 6 of FIG. Further, when the cylindrical cam 5 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 axis, and the sliding piece is moved. The 6 ”advances and the writing tip of the writing body 8 such as the other ballpoint pen projects from the tip end opening of the tip shaft.

Next, the slider 36 is fitted in the cylindrical portion 20 behind the cylindrical cam with the operation button 39 extending through the slit 33, and the eraser 43 is fixed to the rear end of the slider 36. Further, the cylindrical portion 20 is covered, and the rear shaft 4 is rotatably fixed to the center shaft 1 with the rear shaft 4 being in contact with the flange portion 1a of the center shaft 1. In this state, the tubular portion 20 of the cylindrical cam is fitted with the rib 21 of the tubular portion in the guide groove 4a of the rear shaft, so that the cylindrical cam 5 becomes
On the other hand, the rotation is stopped so that only forward and backward movement is possible. Incidentally, the means for stopping the rotation of the rear shaft 4 and the cylindrical cam 5 may be provided for design convenience other than the above. At that time, the operation button 39
Is in a state of protruding from the window portion 4c of the rear shaft 4. Further, the crown 41 is fixed to the rear end portion 20b of the tubular portion 20. As described above, when the rear shaft 4 is moved back and forth while pressing the operation button 39, the eraser 43 appears and disappears from the rear end hole of the crown 41.

FIGS. 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 means for fitting the projection 17 into the circumferential groove 60,
A partition wall 62 having an inclined surface 63 is provided on an upper wall of a guide groove 61 in which the projection 17 is fitted from the rear end of the central shaft 1 #.
The reason for providing the partition wall 62 is to enhance the rigidity of the center shaft 1 ° at the engaging portion.

[0018]

First, in the first embodiment, when the rear shaft 4 is rotated to one side with respect to the front shaft 3 or the center shaft 1, it is provided at the tip of the cam slope 14 of the cylindrical cam 5 as shown in FIG. The notch 15 engages with the sliding piece 6 of one of the mechanical pencil writing bodies 7 so that the writing tip portion thereof projects from the tip end opening of the tip shaft. At this time,
The protrusion 17 of the cylindrical cam 5 is a circumferential groove 19 of the center shaft 1 and a wide groove 52.
It is located in. In this state, when the rear end of the crown 35 is knocked and the cylindrical cam 5 is axially moved, the movement of the sliding cam 6,
It is transmitted to the lead pipe 23 and the mechanical pencil cursive body 7,
From the state in which the step portion 28 of the writing tip portion is in contact with the inner step portion 27 of the tip shaft 3, the chuck moves axially together with the joint 29 and the core is fed out. Further, when the rear shaft 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 is retracted, and instead, the writing tip portion of the writing body 8 such as a ballpoint pen projects from the leading tip end opening. When the cursive body is stored or when the cursive body such as a ball-point pen is projected, the protrusion 17 is the narrow groove 53 of the circumferential groove 19.
The front wall 5 of the circumferential groove 19 with the step 20a of the cylindrical cam 5 in contact with the rear end of the center shaft 1 by knocking.
Since it does not come into contact with 5, the protrusions and the like will not be destroyed.

Next, the slider 36 is moved back and forth while pressing the operation button 39 against the rear shaft 4, and the engaging protrusion of the slider is engaged with the engaging portion provided on the inner surface of the slit 33 of the cylindrical rear portion of the cylindrical cam. 40 is disengaged, and the eraser 43 is retracted from the rear end hole of the crown 41.

[0020]

As described above, according to the present invention, the number of parts is omitted, the structure is simplified, the assembly is facilitated, and the cost can be reduced. Further, since the rear shaft (cap) can be set to an appropriate length, there is flexibility in design and rotation operation becomes easy. Further, since the cursive body retracting operation is a rotary type and the eraser retracting operation is a sliding type, the operation is differentiated and no malfunction occurs.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a partial non-cross section showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an engagement state between a projection of a cylindrical cam and a peripheral groove of a center shaft.

FIG. 3 is an explanatory view showing another example of an engagement state between a projection of a cylindrical cam and a peripheral groove of a center shaft.

FIG. 4 is a cross-sectional view of a main part of an engaging portion in FIG. 3;

[Explanation of symbols]

 1 Middle shaft 1'Middle shaft 1a Collar part 1b Locking part 2 Guide tube 3 Front shaft 4 Rear shaft 4a Guide groove 4b Locking part 4c Window part 5 Cylindrical cam 6 Sliding piece 6'Sliding piece 7 Mechanical pencil writing body 8 Ballpoint pen Etc. Writing body 9 Guide groove 9'Guide groove 10 Cylindrical part 11 Knock spring 12 Engaging groove 13 Engaging part 14 Cam slope 15 Notch 16 Partition part 17 Protrusion 18 Vertical groove 19 Circumferential groove 20 Cylindrical part 20a Step part 20b Rear end part 20c Projection 21 Rib 22 Projection 22 'Projection 23 Core pipe 24 Flange section 25 Tail plug 26 Locking section 27 Inner step section 28 Step section 29 Joint 30 Return spring 30' Return spring 31 Step section 32 hole 32 'hole 33 Slit 34 Protrusion 35 Groove 36 Slider 37 Cylindrical part 38 Elastic piece 39 Operation button 40 Engagement protrusion 41 Crown 42 Groove 43 Erase Arm 50 inclined surface 51 Habasema portion 52 wide width portion 53 Habasemamizo 54a rear wall 54b inclined face 54c rear wall 55 front wall 60 peripheral groove 61 guide groove 62 partition wall 63 inclined surface

Claims (2)

[Claims] 1. A plurality of writing bodies in which a front end of a front shaft and a front end of a center shaft are fixed to each other in a non-rotatable and retaining manner, and a sliding member is fixed to a rear end of a guide unit integrated with the center shaft. A return spring is urged between the moving piece and each of them to be fitted back and forth in the axial direction, and a cylindrical cam having a cam slope that is displaced in the axial direction at the front end can be rotated within a certain range with respect to the center shaft. To prevent each slipping piece from coming off and contacting the slanting piece with the cam slant surface of the cylindrical cam, the sliding piece is alternately moved in the front-rear direction by the rotation of the cylindrical cam with respect to the front shaft or the center shaft. In a compound writing instrument having a tip that can be selectively retracted from a tip end opening of a front shaft, a cylindrical portion is integrally provided behind the cylindrical cam, and the cylindrical slit and the inner surface of the slit are engaged in a stepwise manner. Engagement part is provided, on the other hand, engagement that allows elastic displacement in the axial direction A slider having a raised portion and an eraser fixed to the rear end thereof is provided so as to be fitted and inserted into the tubular portion and the engaging projection to penetrate into the slit so that the engaging projection is locked to the engaging portion. Further, the rear shaft is covered with the cylindrical portion so that the rear shaft is rotatably attached to the rear of the center shaft, and the rear shaft and the cylindrical portion, that is, the cylindrical cam are integrally engaged in the rotation direction, and A window portion is formed on the same side as the slit, and an operation button that interlocks with the engagement protrusion is appropriately protruded from the window portion, and by pressing the operation button, the engagement portion between the engagement protrusion and the slit. A compound writing instrument, wherein the eraser is configured to move rearward while releasing the locked state with the eraser so that the eraser projects from the rear end of the rear shaft. 2. The cylindrical portion behind the cylindrical cam is appropriately projected from the rear end hole of the rear shaft, and the cylindrical portion, that is, the cylindrical cam, is axially movable with respect to the rear shaft, and at least one of them is a mechanical pencil writing instrument. 2. The double-sided writing instrument according to claim 1, wherein the core portion can be extended by axially shifting the tubular portion with respect to the rear axle.