JP3614224B2 - Double writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the provision of a compound writing instrument in which the tips of a plurality of writing bodies can be made to appear alternately at the front end of the front shaft and the eraser can be made to appear at the rear end of the rear shaft.
[0002]
[Prior art]
Conventionally, as an example of a dual-type writing instrument, as shown in Japanese Utility Model Publication No. 64-3491 by the same applicant, a guide having a sliding groove for guiding two writing bodies and fixed to a front shaft. It has a cam slope on the front end that makes contact with the slide piece attached to the cylinder and the two cursives fitted to the guide cylinder, and the rear end is a knock part that can move in the axial direction relative to the cap. In addition, it has a cylindrical cam that is mounted so that rotation in the circumferential direction is integrated, and two writing bodies can be selectively projected and retracted at the front end of the front shaft by rotating the cap with respect to the front shaft. Writing instruments are present. Further, as seen in Japanese Patent Application Laid-Open No. 3-79397, the rear end edge of the sliding piece has a circumferential cam inclined surface that is displaced in the axial direction, and the cam engaging projection that abuts the cam inclined surface is formed in the inner hole portion of the cap. There is a dual writing instrument.
Japanese Utility Model Laid-Open Nos. 58-26589 and 58-26577 are known in which an eraser and other writing tools are provided at the rear end of the shaft tube.
Further, as a conventional example, a double-type writing instrument in which other articles such as an eraser and other writing instruments are exchangeable at the rear end portion of the shaft cylinder is known by the same applicant in Japanese Utility Model Publication No. 2-28077.
[0003]
[Problems to be solved by the invention]
By the way, the conventional example shown in the above Japanese Utility Model Publication No. 2-28077 has a problem that the structure is complicated, the number of parts is large, and it cannot be provided at low cost. In addition, since the cap is long with respect to the front shaft, there are a problem that the front and rear ends of the shaft cylinder are gripped and the rotation operation is performed, and a disadvantage that the appearance is bad.
The present invention has an object to solve the above problems, and the two types of eraser feeding side can be exchanged with respect to the writing instrument side so that user-friendliness can be selected, and the lead can be replenished from the rear end to the lead receiving portion. It becomes a subject to become.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the dual writing instrument of the present invention is such that the front end of the front shaft and the center shaft are fixed to each other in a non-rotatable and retaining state, and each of the guide grooves integrated with the center shaft has a writing body. A cylindrical cam with a cam slope that is axially displaced at the front end is fitted to the guide or the middle shaft. On the other hand, by rotating the cylindrical cam with respect to the central shaft by rotating the cylindrical cam with respect to the middle shaft by making each sliding piece abut against the cam slope, the tip of each cursive body is selectively moved from the front end of the front shaft. In the front writing part that allowed to appear and the compound writing instrument that allowed the eraser to appear in the rear part,
One is the rear axle is possible and integrally fixed releasably to the rear of the cylindrical cam, the rear bore portion of the rear shaft, an eraser by rotating the rear end portion that protrudes to the rear shaft and retractable An eraser feeding device is arranged, and the eraser feeding device sandwiches the eraser and a slider having a protrusion on the side inserts the protrusion into the slit and the spiral groove, and the eraser moves back and forth by rotating the spiral groove with respect to the slit. It is possible to move.
[0005]
In the two types, the rear shaft is detachable and fixed integrally behind the cylindrical cam, and a slit is formed in the side surface of the rear shaft, and protrusions and grooves are alternately formed on the inner surface of the slit. The slider with the eraser attached to the rear is provided with an engaging projection provided on its outer periphery so that it can be engaged with and disengaged from the engaging portion groove of the slit, and the slider is moved back and forth with respect to the rear shaft. The eraser can be projected and retracted from the rear end of the rear shaft.
[0006]
【Example】
1 to 6 show an embodiment of the present invention. FIG. 1 shows one type of dual writing instrument, and FIG. 6 shows two types of dual writing instrument.
First, one type of compound writing instrument of the present invention is a middle shaft 1, a tip shaft 3, a cylindrical cam 5, a pair of sliding pieces 6, 6 ｀, a mechanical pencil writing body 7, a ballpoint pen, etc., which are integrally provided with a guide tube 2. The body 8 is a main component of the rear shaft 4 provided with an eraser feeding mechanism.
First, the middle shaft 1 is made of resin, and as shown in the figure, a guide groove 9 having an axially long guide groove 9 that opens from the substantially central portion to the rear end and a similar guide groove 9 に on the opposite side surface. A cylinder 2 is provided. The front half of the guide tube 2 is provided with a tube portion 10 having a partition portion 16 having holes 31 and 31 し て in communication with the guide grooves 9 and 9 開口 and having an opening at the front end. A stepped portion 30 is provided at the end, and a bulging engagement portion 13 is formed on the front outer periphery of the stepped portion 30.
[0007]
Further, as shown in FIG. 3, the longitudinal groove 18 is connected to the circumferential groove 19 through the inclined surface 60 on the rear side surface of the central shaft 1, and a substantially L-shaped window is formed. Has been. As will be described later, the projection 17 of the cylindrical cam 5 is inserted from the longitudinal groove 18, and the projection 17 elastically expands the inclined surface 60 and passes through the narrow portion 61 and enters the circumferential groove 19. The cylindrical cam 5 rotates while the projections 17 abut against the circumferential rear wall of the circumferential groove 19 so that the writing parts of the mechanical pencil writing body 7 or the writing body 8 such as a ballpoint pen appear alternately from the front end of the front shaft. Become. Further, the circumferential groove 19 is provided with a wide groove 62 so that the cylindrical cam 5 can move axially at the position of the projection 17 when the mechanical pencil writing body 7 protrudes, and when the writing body is stored or the writing body 8 such as a ballpoint pen. An inclined surface 64b is connected between the rear wall 64a and the rear wall 64c of the circumferential groove 19 so that the narrow cam 63 is provided so that the cylindrical cam 5 cannot substantially change its axis at the position of the protrusion 17 when the protrusion protrudes. It has been. Further, as will be described later, the wall 20 of the rear shaft 4 abuts on the rear end of the middle shaft 1 at the front end of the shaft transition, and the front end of the projection 17 does not contact the front wall 65 of the circumferential groove 19.
[0008]
The front shaft 3 has a tapered front portion, and has a front end opening having an inner step portion 26 at the front end of the inner hole portion. Also, the rear end hole is provided with an engagement groove 12 that is engaged with an engagement portion 13 provided on the outer peripheral portion of the tube portion 10 of the guide tube and is prevented from coming off from the tube portion 10 and being prevented from rotating. . In addition, the cylinder part 10 and the front shaft 3 are detachably fixed with an appropriate force. (Same as the structure of the front shaft in Japanese Utility Model Publication No. 64-3491)
[0009]
The rear shaft 4 is made of resin and has a slightly thick shaft tube portion, and a clip 44 is provided on the rear end side surface of the shaft tube portion. Further, a vertical groove 38 a and a ridge 39 for removably fixing to the rear outer peripheral portion of the cylindrical cam 5 are formed on the peripheral surface of the front inner hole 38.
The cylindrical cam 5 has a cylindrical shape and has a cam slope 14 that is displaced forward and backward in a circumferential shape at the front end edge, and a notch 15 is formed at the foremost end of the cam slope 14. Further, a projection 17 is formed on the side surface of the cylindrical cam 5 so as to be inserted into the longitudinal groove 18 of the central shaft 1 and elastically fitted into the circumferential groove 19 to rotate and prevent it from falling within a certain range (approximately 180 degrees). ing. Further, a longitudinal rib 37 a and a circumferential groove 37 are formed on the rear outer peripheral portion of the cylindrical cam 5, and the rib 37 a is engaged with the groove 38 a of the rear shaft 4 and the groove 37 is engaged with the protrusion 39. Mutually fixed. In addition, not only the said relationship but a mutual groove | channel, a rib, and a protrusion are provided suitably for design convenience.
[0010]
The resin sliding piece 6 has a projection 20 on the outer surface, a central portion projects from the rear end surface of the projection 20, and both sides thereof have cam slopes substantially the same as the cam slope 14 of the cylindrical cam 5 described above. Have. Moreover, the hole which contact | abuts to the flange part 22 of the core pipe 21 and protrudes long and the back of the core pipe 21 is provided. In addition, a tail plug 23 is fixed to the rear end hole of the core pipe 21, and a hole 24 through which one core can be inserted is provided.
Similar to the sliding piece 6, the sliding piece 6 ｀ has a protrusion 20 ｀ and a cam slope, and a locking portion 25 for fixing the rear end of the writing body 8 such as a ballpoint pen is provided at the tip. In addition, the latching | locking part can be made into a pipe shape and can also fit the rear end of a cursive body.
[0011]
The mechanical pencil writing body 7 incorporates a general chuck mechanism, is joined to the core pipe 21 via a joint 28 connected to the chuck mechanism at the rear end, and abuts against a flange portion 22 provided behind the core pipe 21. The sliding piece 6 is fitted, and the tail plug 23 is fixed to the rear end hole of the core pipe 21 protruding from the rear end of the sliding piece 6 as described above. The lead is fed out by sliding the chuck by the axial movement of the sliding piece 6 in conjunction with the cylindrical cam 5 in a state where the step 27 at the tip of the mechanical pencil 7 is in contact with the inner step 26 of the front shaft 3. It is done by moving.
[0012]
In this state, when the rear shaft 4 is rotated in one direction with respect to the middle shaft 1, the return spring 29 is pressed to advance the sliding piece 6, and the notch 15 at the foremost end of the cam inclined surface 14 of the cylindrical cam 5 is sharpened. The writing tip is locked to the projection 20 of the sliding piece 6 of the pencil writing body 7 so that the writing tip protrudes from the tip end of the front shaft. When the rear shaft 4 is rotated in the other direction with respect to the middle shaft 1, the sliding piece 6 is retracted and the writing tip portion of the mechanical pencil writing body 7 is sunk from the front end of the front shaft, and the return spring 29 押 圧 is pressed to slide. The moving piece 6 ｀ moves forward, and the writing tip of the writing body 8 such as the other ballpoint pen projects from the tip end of the front shaft.
[0013]
Further, a step portion 40 is provided at the rear end of the inner hole 38 of the rear shaft 4, and a cylindrical shaft portion 41 is integrally extended toward the rear end behind the step portion 40 so as to protrude from the outer peripheral portion of the substantially front end of the shaft portion 41. A strip locking portion 42 is provided, and a slit 43 is formed from the outer periphery of the rear portion to the rear end in the axial direction. On the other hand, an inner cylinder 32 having a spiral groove 34 formed on the inner peripheral surface of the cylindrical portion 33 is provided. While being fitted on the outer periphery of the shaft portion 41, the front end of the rear end portion 32 a abuts on the rear end of the rear shaft 4, and a circumferential locking groove 35 provided on the inner periphery of the front end of the cylindrical portion 33. Is engaged with the locking portion 42 of the shaft portion 41, and the inner cylinder 32 is locked to the rear shaft 4 so as to be rotatable only.
[0014]
In addition, a slider 45 having a protrusion 47 on the side surface with the eraser 51 sandwiched in the shaft 41 is inserted, and the protrusion 47 passes through the slit 43 and is further engaged with the spiral groove 34. The eraser 51 can be projected and retracted from the rear end hole of the inner cylinder 32 by rotating the rear end portion 32 a of the inner cylinder with respect to the rear shaft 4.
[0015]
By the way, in the said Example, although the center axis | shaft 1 and the guide cylinder 2 were comprised integrally, it is free to comprise separately.
4 and 5, the projection 17 of the cylindrical cam 5 is elastically fitted into the circumferential groove 71 formed in the circumferential surface of the central shaft along the guide groove 70 of the central shaft 1, so that the cylindrical cam 5 Another example is shown in which the shaft is prevented from coming off from the center shaft 1 and is rotated within a certain range, and the means can be incorporated in the above-described embodiment in design.
[0016]
Next, there are two types of compound writing instruments, but the first half is the same as above, and the differences will be described below.
As shown in FIG. 6, the rear shaft 80 is detachably and integrally fixed to the rear of the cylindrical cam 87, and a slit 84 is formed on the side surface of the rear shaft 80, and a protrusion 85 is formed on the inner surface of the slit 84. And the groove 90 are alternately formed, and the slider 90 with the eraser 94 attached to the rear is engaged with the engagement protrusion 93 provided on the outer periphery of the slider 90 with the engagement portion groove 86 of the slit 84. It is provided so that it can be detached, and the eraser 94 can be projected and retracted from the rear end of the rear shaft 80 by moving the slider 90 back and forth with respect to the rear shaft 80.
[0017]
Further, the rear shaft 80 is configured to engage and disengage the protrusion 83 provided on the inner peripheral surface of the rear shaft in a groove 89 provided at an appropriate position on the outer periphery of the rear end portion 88 of the cylindrical cam 87. The one type of dual writing instrument and the shape of the engagement / disengagement part are shown differently. However, it can be made in common, and two types can be handled with good compatibility according to user's preference.
[0018]
[Action]
When the rear shaft 4 is rotated in one direction with respect to the front shaft 3 or the middle shaft 1, the notch 15 provided at the tip of the cam inclined surface 14 of the cylindrical cam 5 slides on one mechanical pencil writing body 7 as shown in FIG. 1. The writing tip is projected from the tip end of the front shaft by engaging with the top 6. At this time, the projection 17 of the cylindrical cam 5 is located in the wide groove 62 by the circumferential groove 19 of the central shaft 1. In this state, the operation of knocking the rear end portion 32a of the inner cylinder 32 and moving the rear shaft 4, that is, the cylindrical cam 5, is transmitted to the sliding piece 6, the core pipe 21, and the mechanical pencil writing body 7, and the leading end of the writing. The chuck moves together with the joint 28 from the state where the stepped portion 27 of the portion abuts against the inner stepped portion 26 of the tip shaft 3, and the lead is fed out. Further, when the rear shaft 4 is rotated in the other direction with respect to the front shaft 3 or the middle shaft 1, the mechanical pencil writing body 7 is retracted, and instead, the writing front end portion of the writing body 8 such as a ballpoint pen protrudes from the front end of the front shaft. When the cursive body 8 is stored, or when the cursive body 8 such as a ballpoint pen protrudes, the protrusion 17 is positioned in the narrow groove 63 of the circumferential groove 19 and knocks to form a step portion of the rear shaft 4 at the rear end of the middle shaft 1. It is possible to prevent the protrusions and the like from being destroyed by providing the protrusions 17 in such a size that the protrusions 17 do not contact the front wall 65 of the circumferential groove 19 in a state where the contact 40a is in contact.
[0019]
In one type, when the rear end portion 32a of the inner cylinder 32 is rotated with respect to the rear shaft 4, the slider 45 moves back and forth, and the eraser 51 appears and disappears from the rear end hole of the inner cylinder 32.
In the case of the two types, the eraser is erased from the rear end by sliding back and forth while pressing the operation button 92 interlocking with the engagement protrusion 93 of the slider 90 that engages with the engagement portion of the slit 84 with respect to the rear shaft 80. 94 appears.
In addition, replenishment of the lead is performed by inserting a lead through the hole 24 of the tail plug 23 fixed to the rear end of the lead pipe 21, but a structure for preventing lead leakage or a removable rear end closed tail plug. It is also conceivable to provide
[0020]
【The invention's effect】
As described above, the conventional structure is complicated and has a large number of parts, which cannot be provided at low cost, and the cap is long with respect to the front shaft, so there is a problem that the tip and rear ends of the shaft tube are gripped and the rotation operation is poor, and the appearance is bad. Solved.
In addition, the user can select the user-friendliness by making it possible to replace the two types of eraser feeding side with respect to the writing instrument side. In addition, the lead can be replenished from the rear end to the lead accommodating portion, and the handling becomes easy.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view showing an embodiment (one type) of the present invention, which is partially non-cross-sectional.
FIG. 2 is an enlarged cross-sectional view of the latter half of FIG.
FIG. 3 is an explanatory view showing a state in which a cylindrical cam and a central shaft are locked.
FIG. 4 is an explanatory view showing another example in a state where the cylindrical cam and the central shaft are locked.
FIG. 5 is a cross-sectional view of a main part in FIG. 4;
FIG. 6 is an overall vertical sectional view showing an embodiment (two types) of the present invention, and is partially non-cross-sectional.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Medium shaft 1 shaft Medium shaft 2 Guide cylinder 3 Front shaft 4 Rear shaft 5 Cylindrical cam 6 Sliding piece 6 ｀ Sliding piece 7 Mechanical pencil writing body 8 Writing body such as ball-point pen 9 Guide groove 9 ｀ Guide groove 10 Tube portion 11 Knock spring 12 Engagement groove 13 Engagement part 14 Cam slope 15 Notch 16 Partition part 17 Protrusion 18 Vertical groove 19 Circumferential groove 20 Protrusion 20 ｀ Protrusion 21 Core pipe 22 Flange part 23 Tail plug 24 Hole 25 Locking part 26 Inner step part 27 Step part 28 Joint 29 Return spring 29 リ タ ー ン Return spring 30 Step portion 31 Hole 31 孔 Hole 32 Inner cylinder 32a Rear end portion 33 Tube portion 34 Spiral groove 35 Locking groove 36 Step portion 37 Groove 37a Rib 38 Inner hole 38a Groove 39 Projection 40 Step portion 40a Step portion 41 Shaft portion 42 Locking portion 43 Slit 43a Step portion 44 Clip 45 Slider 46 Tube portion 46a Holding piece 47 Projection 48 Step portion 49 Rear end portion 5 0 Locking projection 51 Eraser 52 Rear end portion 53 Locking portion 54 Eraser 60 Inclined surface 61 Narrow portion 62 Wide groove 63 Narrow groove 64a Rear wall 64b Inclined surface 64c Rear wall 65 Front wall 70 Guide groove 71 Circumferential groove 72 Rear wall 73 Inclined surface 80 Rear shaft 81 Crown portion 82 Step portion 83 Projection strip 84 Slit 85 Projection 86 Groove 87 Cylindrical cam 88 Rear end portion 89 Groove 90 Slider 91 Elastic piece 92 Operation button 93 Engagement projection 94 Eraser

Claims (2)

The tip of the front shaft and the middle shaft are fixed to each other so that they cannot rotate and are prevented from coming off, and a return spring is urged between the middle shaft and the sliding piece in each of the guide grooves integrated with the middle shaft. Then, a cylindrical cam with a cam slope that is fitted back and forth freely and is circumferentially provided at the front end is secured to the guide part or the center shaft so that it can rotate freely with respect to the guide part or the center shaft. By moving the cylindrical cam back and forth alternately by rotating the cylindrical cam with respect to the center shaft, the front writing portion that allows the front end of each writing body to selectively protrude and retract from the front end of the front shaft, and the eraser to appear and disappear at the rear portion In the dual writing instrument that was made possible,
With at least one as a mechanical pencil cursive, the cylindrical cam can be moved with respect to the central shaft and the lead can be fed out, and the lead can be replenished from the rear end to the lead accommodating part connected to the mechanical pencil cursive. Furthermore, a spiral groove and a slit are formed between the inner cylinder and the rear shaft, which are brought into contact with the rear end of the rear shaft and pivoted with respect to the rear shaft. The slider with a protrusion on the side and the protrusion is inserted into the spiral groove and slit, and the rear end of the inner cylinder with respect to the rear shaft is rotated to rotate the spiral groove with respect to the slit. A compound writing instrument , wherein an eraser feeding device that allows the eraser to move back and forth so that the eraser can move in and out is detachably attached to the rear of the cylindrical cam and fixed integrally therewith. The tip of the front shaft and the middle shaft are fixed to each other so that they cannot rotate and are prevented from coming off, and a return spring is urged between the middle shaft and the sliding piece in each of the guide grooves integrated with the middle shaft. Then, a cylindrical cam with a cam slope that is fitted back and forth freely and is circumferentially provided at the front end is secured to the guide part or the center shaft so that it can rotate freely with respect to the guide part or the center shaft. By moving the cylindrical cam back and forth alternately by rotating the cylindrical cam with respect to the center shaft, the front writing portion that allows the front end of each writing body to selectively protrude and retract from the front end of the front shaft, and the eraser to appear and disappear at the rear portion In the dual writing instrument that was made possible,
With at least one as a mechanical pencil cursive, the cylindrical cam can be moved with respect to the central shaft and the lead can be fed out, and the lead can be replenished from the rear end to the lead accommodating part connected to the mechanical pencil cursive. In addition, the rear shaft is detachably and integrally fixed to the rear of the cylindrical cam, and a slit is formed in the side surface of the rear shaft, and protrusions and grooves are alternately formed on the inner side surface of the slit. The slider is provided with an engaged portion, and the slider with the eraser attached to the rear is provided with an engaging projection provided on the outer periphery thereof so as to be detachable from the engaging portion groove of the slit, and the slider with respect to the rear shaft The writing instrument is characterized in that the eraser can be projected and retracted from the rear end of the rear shaft by moving the back and forth.

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