JP3676446B2 - 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]
As a conventional example 1 of a double writing instrument, as shown in Japanese Utility Model Application Publication No. 64-3491, filed by the same applicant, a guide cylinder having a sliding groove for guiding two writing bodies and fixed to a front shaft. And a cam inclined surface in contact with the sliding piece attached to the two writing bodies fitted to the guide cylinder at the front end portion, and the rear end becomes a knock portion, and is axial with respect to the cap (rear shaft). It is equipped with a cylindrical cam that is mounted so that it can move freely and rotate in the circumferential direction as a unit, and two cursives can selectively appear and disappear at the front end of the front shaft by rotating the cap with respect to the front shaft. There is a double writing instrument.
[0003]
Further, as conventional example 2, there is a dual writing instrument in which an eraser is made to appear by rotating a crown that protrudes from the rear end of a cap (shaft cylinder) as shown in Japanese Utility Model Application No. 60-120898 by the same applicant. Exists.
[0004]
Further, as the conventional example 3, when the slider projecting from the longitudinal slit portion on the side surface of the shaft cylinder is advanced, the tip of the writing body is locked in the projecting state from the shaft tip opening, and when the other slider is advanced, There is widely known a dual-type writing instrument that releases the locked state, immerses the protruding writing body, and instead protrudes the tip of the other writing body.
[0005]
Further, as a conventional example 4, a plurality of narrow longitudinal slit portions are provided on the side surface of the shaft cylinder, and the cylinder body is fitted on the inner surface of the shaft cylinder so as to be freely rotatable only in the rotation direction. A narrow slit that goes straight in the axial direction, and a wide window is drilled so that a locking step is formed on one side of the front end of the slit by providing an appropriate slope at the front end of the slit. Slit portions formed by providing appropriate slopes at the rear of the ends and perforating wide windows in the same direction as described above are provided at a plurality of locations in the same manner as the longitudinal slit portions of the shaft cylinder, while both slit portions are When the slide protrusion that penetrates and protrudes from the side surface of the cylindrical tube is joined so as to interlock with the cursive body, when the slide protrusion is moved forward, the slide protrusion comes into contact with the slope in front of the cylinder. The cylindrical body is rotated to one side, and the slide protrusion engages with the locking step portion of the cylindrical body so that the tip of the writing body Locked in the protruding state, when the other slide protrusion is advanced, it contacts the slope at the rear of the cylinder and rotates the cylinder to the opposite side, so that the previous slide protrusion is unlocked. A double writing instrument in which the leading end of the writing body is retracted, and the rear slide protrusion is further advanced, and is locked to the locking step as described above, and the leading end of the writing body is in a protruding state. Widely known.
[0006]
[Problems to be solved by the invention]
The conventional example 2 has a problem that metal parts are used in many parts, the structure is complicated, the number of parts is increased, and the cost is increased. Moreover, since the crown which protrudes from the rear end of the cap is short, there is a problem that it is difficult to pick it up with a finger and it is difficult to perform the operation of the eraser.
The object of the present invention is to solve the above problems and to further simplify the structure of the entire writing instrument by using the writing mechanism of the writing body shown in the above-described conventional examples 3 and 4, and to perform the eraser feeding operation. It is intended to facilitate.
[0007]
[Means for Solving the Problems]
The front shaft is detachably fixed to the tip of the middle shaft, and at least one of them is a pencil pencil in front of the slider guided in the axial direction to each of the longitudinal slit portions drilled at a plurality of positions on the side surface of the middle shaft. A plurality of cursives are attached, and a return spring is urged between the slider and the front end of the central shaft so that it can be moved back and forth. When one of the sliders is slid forward, the front end of a locking bar extending to the front end of the inner cylinder is locked to the rear end of the slider, and the front end of the writing body protrudes from the front end of the front shaft. It is fixed in a state and can be interlocked by advancement of the inner cylinder, and a rear shaft is integrally provided at the rear of the inner cylinder, and a slit is formed on a side surface of the rear shaft, and on both sides of the slit. Has protrusions and grooves alternately, An eraser holder to which an eraser is fixed is attached by engaging engagement protrusions provided on the outer periphery of the slit so as to be detachably fitted in the slit groove, and the eraser holder is moved back and forth with respect to the rear shaft to remove the eraser from the rear shaft. It is possible to invade from the rear end.
[0008]
【Example】
1 to 4 show an embodiment of the present invention. The compound writing instrument mainly includes a middle shaft 1, a front shaft 3, a pair of sliders 9a and 9b, a mechanical pencil writing body 14, a writing body 15 such as a ballpoint pen, a rear shaft 4 integral with the inner cylinder 21, an eraser holder 28, an eraser 33, and the like. This is a component. First, the middle shaft 1 is made of resin, and as shown in FIG. 1, longitudinal slit portions 1a and 1b are formed in the axial direction at two positions opposite to the rear shaft side surface.
In addition, window portions 1c and 1d are formed behind the longitudinal slit portion on the coaxial line.
In addition, a joint 5 made of resin is fixed to the inner hole 2 at the front end side of the middle shaft 1. A substantially central inner hole of the joint 5 is provided with a partitioning portion 8, and the partitioning portion is provided with holes 8 a and 8 b through which the rear portion of the writing body is inserted, and the outer periphery of the cylindrical portion 8 c extending forward of the front end of the center shaft 1. A bulging engagement portion 7 is formed at the site. (Same as the structure of the cylindrical portion of the guide cylinder of Japanese Utility Model Publication No. 64-3491)
[0009]
The front shaft 3 has a tapered front portion, and has a front end opening having an inner step portion 20 at the front end of the inner hole portion. Further, the rear end hole is provided with a locking groove 6 for receiving the engaging portion 7 provided in the cylindrical portion 8c of the joint 5 and fixing the front shaft 3 to the joint 5 so as to be detachable. (Same as the structure of the front shaft in Japanese Utility Model Publication No. 64-3491)
In addition, the fixing method of the joint 5 and the front shaft 3 is not limited to the above embodiment, and it is also possible to provide a screw portion between them and join them. The joint 5 can also be formed integrally with the tip of the middle shaft 1.
[0010]
The slider 9a is a shaft body having a protruding portion 9a ridge protruding through the longitudinal slit portion 1a of the central shaft 1, and a bulging first protrusion on the opposite shaft side surface facing the protruding portion 9a ridge. 10a is formed, a V-shaped notch 12a is formed near the first protrusion 10a on the rear end surface, and a second protrusion 11a is formed further forward on the axis. Further, a hole 13a for fitting a rear end portion of a core pipe 16 described later is formed in the shaft center portion. The slider 9b is formed in the same manner as the slider 9a. However, instead of the hole 13a, a projecting locking portion 13b fitted into the rear end hole of the writing body 15 such as a ballpoint pen is provided at the front end of the shaft center. Is formed. Note that the locking portion may be formed in a pipe shape, or may be provided so that the rear end of the writing body 15 such as a ballpoint pen is fitted by fixing the pipe.
[0011]
A rear shaft 4 is integrally formed at the rear end of the inner cylinder 21. That is, the flange 4 b provided at the rear end of the inner cylinder 21 is joined to the inner wall of the inner hole 4 a of the rear shaft 4.
Slits 23 are formed on the side surface behind the rear shaft 4, and protrusions 26 and grooves 27 are alternately provided on both sides of the slit 23. Further, an eraser holder 28 having an eraser 33 fixed to the rear end thereof is attached to the inner hole of the inner hole by engaging engagement protrusions 30 provided on the outer periphery thereof with the grooves 27 of the slits 23 detachably. The engaging protrusion 30 is formed at the tip of an elastic piece 30a provided on the side surface of the eraser holder 28, and engages while sliding and elastically displacing in the groove 27 to hold the protruding state of the eraser 33. Further, the center of the engaging protrusion 30 is slightly protruded to form the operation button 29, and the eraser holder 28 can be moved while releasing the engagement between the engaging protrusion 30 and the groove 27 by moving the operation button 29 back and forth. And A crown 25 is fixed to the rear end of the rear shaft 4.
[0012]
Further, a protrusion locking portion 22 a is formed on the side surface of the cylindrical portion 22 of the inner cylinder 21. A locking bar 24 extending in a gate shape is formed at two locations facing the front end of the cylindrical portion 22, and a notch 24 a is provided at the front end of the locking bar 24.
[0013]
The mechanical pencil writing body 14 incorporates a general chuck mechanism and is joined to the core pipe 16 via a joint 14a connected to the chuck mechanism at the rear end, and the rear end of the core pipe 16 is the hole 13a of the slider 9a. Is fitted.
The lead is fed out in a state where the step portion 19 of the base 18 of the mechanical pencil writing body 14 is in contact with the inner step portion 20 of the front shaft 3 by interlocking the chuck with the axial movement of the slider 9a.
[0014]
The pencil 15 and the pen 15 such as a ballpoint pen are inserted into the central shaft 1 with the sliders 9a and 9b connected to the rear ends, and the holes 8a and 8b provided in the partition 8 of the joint 5 described above are provided. The protrusions 9a and 9b of the sliders 9a and 9b are incorporated so as to penetrate through the longitudinal slits 1a and 1b of the middle shaft 1 through the center.
Also, the sliders 9a and 9b are urged rearward by return springs 17a and 17b interposed between the front ends of the sliders 9a and 9b and the partition portion 8 of the joint 5.
[0015]
On the other hand, the eraser holder 28 is fitted and inserted from the rear end of the rear shaft 4 described above, and the engagement protrusion 30 of the eraser holder 28 is engaged with the groove 27 of the slit 23 so that the operation button 29 is penetrated from the slit. The crown 25 is fixed to the shaft portion 4d at the rear end of the rear shaft, the eraser 33 is inserted from the opening of the crown 25, and the end of the eraser 33 is fixed to the eraser holder 28. As described above, when the operation button 29 is moved back and forth with respect to the rear shaft 4, the eraser 33 appears and disappears from the opening. Note that the inner diameter of the opening of the crown 25 is slightly larger than the outer diameter of the eraser 33.
[0016]
Next, the cylindrical portion 22 of the inner cylinder 21 is inserted into the rear end hole of the middle shaft 1, and the pair of locking portions 22 a provided on the inner cylinder 21 are elastically deformed to the window portions 1 c and 1 d of the middle shaft 1. Is locked in and out. The inner cylinder 21 is not rotatable with respect to the middle shaft and can be advanced within a suitable range. The range is set at an interval at which the flange portion 4b of the rear shaft contacts the rear end of the middle shaft 1.
As shown in FIGS. 2 and 3, the first protrusions 10a and 10b of the sliders 9a and 9b are extended in a gate shape from the front end of the cylindrical portion 22 of the inner cylinder 21 in the gap in the perpendicular direction facing each other. A locking bar 24 is fitted, and a notch 24 a is provided at the tip of the locking bar 24.
[0017]
When the slider 9a is advanced from the state of FIG. 2, the notch 24a of the locking bar 24 is engaged with the rear end portion of the slider 9a. (See FIG. 1) Further, when the inner cylinder 21 is advanced from this state, the slider 9a advances in conjunction with the advancement. Next, when the other slider 9b is advanced from the state of FIG. 1, the second protrusion 11b abuts on the first protrusion 10a of the slider 9a to release the engagement of the notch, and the slider 9a The slider 9b moves backward by the urging force of the return spring 17a, and instead the rear end of the slider 9b engages with the notch 24a of the locking bar 24.
[0018]
By the way, what was mentioned above makes it possible to appear and disappear two kinds of cursive letters, but more than that can also be used. FIG. 4 shows a case in which three types of cursive letters can appear and disappear. Sliders 41a, 41b, and 41c are arranged to be able to move back and forth at 120 ° division positions with respect to the middle shaft 43, and the locking bars 40 are fitted in the gaps between the sliders and the sliders as described above. , 41c is provided with a rear end portion with which a V-shaped notch (not shown) provided at the front end of the locking bar 40 engages.
[0019]
The above-described eraser feeding device is not limited to the embodiment, and a method of moving the eraser holder back and forth by rotating operation using a spiral screw and a method of feeding out the eraser by knocking operation using a chuck are also conceivable.
[0020]
[Action]
When the slider 9a is advanced, the notch 24a of the locking bar 24 is engaged with the rear end portion of the slider 9a as shown in FIG. 1, and the writing tip portion of the mechanical pencil writing body 14 projects from the tip end of the front shaft 3. To do. In this state, when the rear shaft 4 is shifted relative to the middle shaft 1, the slider 9 a is interlocked by the locking bar 24, and the step portion 19 of the base 18 comes into contact with the inner step portion 20 of the front shaft 3. Along with 14a, the axis of the chuck moves and the lead is fed out.
Further, when the other slider 9b is advanced, the engagement between the slider 9a and the locking bar 24 is released, and the writing tip of the mechanical pencil writing body 14 is retracted and is immersed in the front shaft. 9 b engages with the locking bar 24, and the writing tip of the writing body 15 such as a ballpoint pen projects from the tip opening of the tip shaft 3.
[0021]
Next, when the operation button 29 is moved rearward with respect to the rear shaft 4, the engagement protrusion 30 of the eraser holder 28 moves while being engaged with and disengaged from the groove 27 along the slit 23 of the rear shaft 4. The holder 28 is retracted and the eraser 33 is fed out from the opening of the crown 25.
Further, when the operation button 29 is moved forward, the eraser holder 28 moves forward, and the eraser 33 enters the opening of the crown 25 together with it.
[0022]
【The invention's effect】
As described above, according to the present invention, the main part is formed as a resin molded product, and the parts can be integrated and the structure can be simplified.
In addition, the cursive font can be selected by the forward operation of the slider, which is very convenient.
Further, since the eraser can appear and disappear by the back and forth movement of the operation button with respect to the rear shaft, the usability is further improved.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view showing an embodiment of the present invention, and shows a state where a writing tip portion of a mechanical pencil writing body is projected from a tip end of a front shaft.
FIG. 2 shows a longitudinal sectional view of the cursive in a stored state in the embodiment.
3 is a cross-sectional view taken along line AA in FIG. 2;
FIG. 4 is a cross-sectional view corresponding to FIG. 3 when there are three types of cursive letters.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Middle shaft 1a Longitudinal slit part 1b Longitudinal slit part 1c Window part 1d Window part 2 Inner hole 3 Front axis | shaft 4 Rear axis | shaft 4a Inner hole 4b Ridge part 4c Window part 4d Shaft part 4e Projection part 5 Joint 6 Locking groove 7 Engagement part 8 Partition 8a Hole 8b Hole 9a Slider 9b Slider 9a ｀ Projection 9b ｀ Projection 10a First projection 10b First projection 11a Second projection 11b Second projection 12a Notch 12b Notch 13a Hole 13b Locking portion 14 Mechanical pencil writing body 14a Joint 15 Ballpoint pen writing body 16 Core pipe 17a Return spring 17b Return spring 18 Base 19 Step portion 20 Inner step portion 21 Inner tube 22 Tube portion 22a Locking portion 23 Slit 24 Locking bar 24a Notch 25 Crown 25a Locking groove 26 Projection 27 Groove 28 Eraser holder 29 Operation button 30 Engagement protrusion 30a Elastic piece 31 Engagement piece 32 Stop projection 33 eraser 40 engaging bar 41a slider 41b slider 41c slider 42a cutout 42b notch 42c notch 43 inner shaft

Claims (2)

The front shaft is detachably fixed to the front of the middle shaft, and at least one of them is a mechanical pencil cursive in front of the slider guided in the axial direction to each of the longitudinal slit portions drilled at a plurality of positions on the side surface of the middle shaft. A slider to which a plurality of cursive bodies are attached and a mechanical pencil cursive body is attached is formed by forming a hole for fitting a rear end portion of a core pipe connected to the mechanical pencil cursive body at an axial center thereof. A return spring is urged between the slider and the front end of the middle shaft so as to be able to move back and forth, and a protrusion provided on the front side surface of the inner cylinder in a window provided on the rear end side surface of the middle shaft. The inner cylinder is provided so that only the axial movement can be appropriately performed with respect to the middle shaft by locking the parts by mutual elastic deformation, and when one of the sliders is slid forward, the two positions are opposed to the front end of the inner cylinder. Extend to gate shape The tip of the rear end of the slider into the notch provided on the front end of the locking bar is locked cursive is made possible interlocking with advancement of the inner cylinder is fixed to the protruding state from the front barrel tip was, the sliders The tip of each cursive body can be selectively projected and retracted from the front end of the front axis by alternately moving the inner cylinder, and when the mechanical pencil is selected, the inner cylinder can be moved with respect to the center axis, and the lead can be extended. A dual-type writing instrument, wherein an eraser feeding device is integrally disposed at the rear end of the inner cylinder.   A rear shaft is integrally provided on the rear side of the inner cylinder, slits are formed on the side surfaces of the rear shaft, and protrusions and grooves are alternately provided on both sides of the slit, and an eraser is fastened on the rear side. The eraser holder is attached by engaging and disengaging the engagement protrusion provided on the outer periphery of the eraser holder in the slit groove, and the operation protrusion of the eraser holder with respect to the rear shaft is moved back and forth to provide the engagement protrusion on the rear shaft. 2. The dual writing instrument according to claim 1, wherein the eraser can be projected and retracted from the rear end of the rear shaft by engaging with the groove of the slit.

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