JP3611215B2 - Double writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dual-type 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. In addition, as a cited example of the present application, 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 the cap, as seen in Japanese Utility Model Laid-Open No. 60-120898 by the same applicant. .
[0003]
[Problems to be solved by the invention]
In the above cited example, there are problems that metal parts are used in many parts, the structure is complicated, the number of parts is increased, and the cost is increased.
[0004]
[Means for Solving the Problems]
The dual writing instrument of the present invention devised to solve the above-described problems is provided with an engaging portion that fits the tip of the resin front shaft and the resin center shaft in a non-rotatable and retaining state, respectively. Both were fixed. A guide portion integrated with the middle shaft, and a substantially L-shaped window with a longitudinal groove and a circumferential groove connected through a narrow portion on the rear side surface of the middle shaft are perforated and slide in a plurality of guide grooves provided in the guide portion. A plurality of cursive bodies with at least one frame attached to the rear end is a mechanical pencil cursive body, and each is fitted back and forth through a return spring so that it can be moved back and forth. Protrusions are provided on the side surfaces of the cam parts provided in a shape, and the protrusions are elastically fitted into the circumferential grooves to prevent the cam part from rotating with respect to the guide part and the central shaft within a certain range and preventing the shaft from moving out. Alternatively, each sliding piece is alternately moved in the front-rear direction by rotation of the cam part with respect to the center shaft, so that the tip of each writing body can be selectively projected and retracted from the front end of the front shaft, and the cam is only selected when the mechanical pencil is selected. The core is moved around and the core is extended. Also, after the chuck body is integrally formed with the eraser accommodating part at the rear of the cam part, a fastener is disposed on the outer periphery of the grip part of the chuck body, and the crown is fixed to the rear end of the chuck body With the shaft stopped, the chuck body is urged backward by a spring, and when the mechanical pencil is used, the rear end of the rear shaft is knocked so that the chuck body and cam can be linked together to feed the core. To do. In the state where the mechanical pencil is housed, the rear shaft is moved relative to the middle shaft, and the eraser is moved up and down.
As described above, the compound writing instrument of the present application has a simple structure with a reduced number of parts, so that assembly is facilitated and cost reduction is possible.
[0005]
【Example】
FIG. 1 and FIG. 3 show an embodiment of the present invention. The compound writing instrument of the embodiment includes a middle shaft 1 having a guide portion 2 integrally, a tip shaft 3, a cam portion 5 having a chuck body 39 integrally, a pair of sliding pieces 6, 6６, a mechanical pencil writing body 7, The cursive body 8 such as a ballpoint pen, the rear shaft 4, the crown 42, and the eraser 42 are the main components. First, the middle shaft 1 is made of resin, and as shown in FIG. 1, it has a guide groove 9 that is long in the axial direction that opens from the substantially central portion to the rear end, and a similar guide groove 9 に on the opposite side surface. A guide part 2 is provided. The front half of the guide part 2 is provided with a cylinder part 10 provided with a partition part 16 having holes 33 and 33 し て in communication with the respective guide grooves 9 and 9 て and having an open front end. A bulging engagement portion 13 is formed on the front outer periphery of the step portion 32. (It may be a screw part.)
[0006]
Further, as shown in FIG. 2, the narrow groove 45 is connected to the circumferential groove 19 through the inclined surface 44 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 cam portion 5 is inserted from the longitudinal groove 18, and the projection 17 elastically expands the inclined surface 44 and passes through the narrow portion 45 and enters the circumferential groove 19. The cam portion 5 rotates while the protrusions 17 abut against the rear wall in the circumferential direction of the circumferential groove 19, and the writing portions 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 46 so that the cam portion 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 48b is connected between the rear wall 48a and the rear wall 48c of the circumferential groove 19 to provide a narrow groove 47 so that the cam portion 5 cannot substantially move at the position of the protrusion 17 when the protrusion protrudes. It has been.
[0007]
The front shaft 3 is tapered forward, and has a front end opening with an inner step portion 28 at the front end of the inner hole. 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 configuration of the front shaft of Japanese Utility Model Publication No. 64-3491, but it may be a screw part)
[0008]
The cam portion 5 has a cylindrical shape, and has a cam slope 14 that is displaced back and forth in a circumferential manner at the front end edge, and a notch 15 is formed at the front end of the cam slope 14. Further, a projection 17 is formed on the side surface of the cam portion 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 be rotated and retained within a certain range (approximately 180 degrees). .
[0009]
Further, a collar portion 20 is formed behind the cam portion 5, and a chuck body 39 is integrally formed behind the cam portion 5, respectively. (It may be a separate member for convenience)
In addition, the outer peripheral portion behind the chuck body 39 is appropriately provided with a slit (not shown) to form a grip portion that can be reduced in diameter. An inner step portion 41 is formed at the front end of the inner hole of the chuck body 39.
[0010]
Further, the sliding piece 6 has a projection 23 on the outer surface, and a central portion projects from the rear end surface of the projection 23, and both sides thereof have cam slopes substantially the same as the cam slope 14 of the cam portion 5 described above. doing. Further, a hole is provided in contact with the flange portion 25 of the core pipe 24 so as to protrude long and fit behind the core pipe 24. Similarly to the sliding piece 6, the sliding piece 6 突起 has a projection 23 斜面 and a cam inclined surface, and a locking portion 27 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 24 through a joint 30 connected to the chuck mechanism at the rear end, and abuts against a flange portion 25 provided behind the core pipe 24. The sliding piece 6 is fitted, and the rear end hole of the core pipe 24 protruding from the rear end of the sliding piece 6 is closed with a tail plug 26 or the like. The lead is fed out by moving the chuck according to the axial movement of the sliding piece 6 while the step 29 at the tip of the mechanical pencil 7 is in contact with the inner step 28 of the front shaft 3.
[0012]
On the other hand, the rear shaft 4 has a protruding locking portion 36 on the outer periphery of the shaft portion 35 at the rear end, and has a protruding portion 22 in a substantially intermediate inner hole. Further, the inner hole before and after the protrusion 22 has inner peripheral portions 21a and 21b having a polygonal cross section as appropriate. By the way, the outer periphery of the flange portion 20 behind the cam portion 5 has the same polygonal shape fitted in the polygonal hole.
A spring 43 is fitted from the rear end of the chuck body 39, and the front end of the spring 43 is brought into contact with the rear end of the flange portion 20. From this state, the rear shaft 4 is inserted into the chuck body 39, the rear end of the spring 43 is brought into contact with the inner end portion of the rear end of the shaft portion 35, and the flange portion 20 elastically pushes the protrusion 22 of the rear shaft. It gets over and is engaged and is prevented from coming off. Further, the collar portion 20 is rotationally stopped by the polygonal fitting, and the rear shaft 4 is urged by the spring 43 so as to be able to shift the shaft with respect to the chuck body 39.
[0013]
Further, a fastener 40 is fitted on the outer periphery of the gripping portion at the rear end of the chuck body 39, and is further fitted, and the crown 34 is fixed to the shaft portion 35 of the rear shaft. A groove-like locking portion 37 that engages with the locking portion 36 of the shaft portion is provided at the front opening of the crown 34. In addition, a step 34a is provided at the rear end of the inner hole of the crown 34 in which the fastener 40 is fitted, and a hole 34b that frictionally engages the eraser 42 is provided at the rear end. Further, a clip 38 is integrally connected to one side of the outer periphery of the crown 34 by a base portion 38.
[0014]
Next, in order of assembly, the mechanical pencil writing body 7 and the writing body 8 such as a ball-point pen are connected to the sliding pieces 6 and 6 に at the rear ends, respectively, and the guide grooves 9 of the guide portion 2 of the middle shaft described above. , 9 ｀ movably fitted, and rearward by return springs 31, 31 装 interposed between the front end face of each sliding piece 6, 6 と and the guide groove 9, 9 ｀ front partition 16. Energized.
[0015]
On the other hand, the spring 43 is inserted into the outer peripheral portion of the chuck body 39, the cam portion 5 is inserted into the inner hole of the rear shaft 4, the hook portion 20 is engaged with the protrusion 22, and the cam portion 5 is engaged with the rear shaft. The chuck body 39 is prevented from coming off and rotated. Next, the fastener 40 is fitted on the outer periphery of the gripping portion of the chuck body, and the crown 34 is fixed to the shaft portion 35 at the rear end of the rear shaft.
[0016]
From this state, the cam portion 5 is inserted into the rear end hole of the middle shaft 1 and the projection 17 is elastically fitted into the circumferential groove 19 so that the cam shaft 5 can rotate 180 degrees circumferentially with respect to the middle shaft 1 and is prevented from coming off. And stop. In addition, with the mechanical pencil writing body 7 protruding, the cam portion 5 can be shifted by the stroke required for the center extension with respect to the center shaft 1, and the writing body 8 such as a ballpoint pen protrudes when the writing body is stored. In the state, the axis transition is made impossible. Since the sliding pieces 6 and 6 常 時 are always urged rearward by the return springs 31 and 31 ｀, the cam slope of the projections 23 and 23 ｀ is always kept in contact with the cam slope 14 of the cam portion 5. ing.
[0017]
In addition, the rear end surface of the front shaft 3 is in contact with the front surface of the step portion 32 of the middle shaft 1, and the engaging portion 13 of the cylindrical portion 10 is elastically fitted in the engaging groove 12 of the front shaft 3, The shaft 3 and the middle shaft 1 are fixed in a rotation-preventing and retaining state. The front shaft 3 can be attached and detached with an appropriate force. In this state, when the rear shaft 4 is rotated in one direction with respect to the front shaft 3 or the middle shaft 1, the sliding piece 6 moves forward, and the notch 15 at the foremost end of the cam slant surface 14 of the cam portion 5 is one mechanical pencil cursive. 7 is engaged with the projection 23 of the sliding piece 6 so that the writing tip protrudes from the tip end of the front shaft. Further, when the rear shaft 4 is rotated to the other side with respect to the front shaft 3 or the middle shaft 1, the sliding piece 6 is retracted and the writing tip portion of the mechanical pencil writing body 7 is immersed from the front end of the front shaft. 6 ｀ moves forward, and the writing tip of the writing body 8 such as the other ball-point pen protrudes from the tip end of the front shaft.
[0018]
FIGS. 3 and 4 show other corresponding examples showing the engagement state between the protrusion 17 of the cam portion 5 and the center shaft 1 mm. In this case, as a means for fitting the protrusion 17 into the circumferential groove 50, a partition wall 52 having an inclined surface 53 is provided on the upper wall of the guide groove 51 for fitting the protrusion 17 from the rear end of the center shaft 1 軸. . The reason for providing the partition wall 52 is to reinforce the rigidity of the central shaft 1 ｀ in the engaging portion.
[0019]
Next, the eraser 42 is inserted in a state where the rear shaft 4 is advanced with respect to the chuck body 39 and the grip portion of the chuck body is expanded.
[0020]
[Action]
When the rear shaft 4 is rotated in one direction with respect to the front shaft 3 or the middle shaft 1, a notch 15 provided at the tip of the cam slope 14 of the cam portion 5 is a sliding piece of one mechanical pencil writing body 7 as shown in FIG. 6 is engaged and the writing front-end | tip part protrudes from a front-end | tip front-end opening | mouth. At this time, the protrusion 17 of the cam portion 5 is positioned in the wide groove 46 by the circumferential groove 19 of the central shaft 1. When the rear end of the crown 34 is knocked and the interlocking cam portion 5 is shifted in this state, the movement is transmitted to the sliding piece 6, the core pipe 24, and the mechanical pencil cursive body 7, and the step portion at the front end portion of the writing. From the state where 29 is in contact with the inner step portion 28 of the front shaft 3, the chuck moves together with the joint 30 and the lead is fed out.
[0021]
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 is stored or when the cursive body such as a ballpoint pen is projected, the protrusion 17 is positioned in the narrow groove 47 of the circumferential groove 19 and knocks to the rear end of the rear shaft 4 at the rear end of the middle shaft 1. If the protrusion 17 is set so as not to contact the front wall 49 of the circumferential groove 19 in a state where 41 is in contact with the rear end of the guide portion 2, the protrusion 17 and the like will not be broken. Next, when the rear shaft 4 is moved forward with respect to the middle shaft 1 by placing a finger on the rear end of the base portion 38 ク リ ッ プ of the clip, the rear shaft 4 moves forward with respect to the chuck body 39 from the state where the forward movement of the cam portion 5 is blocked. The eraser 42 appears and disappears from the hole 34 b of the crown 34.
In other words, the fastener 40 engages with the outer periphery of the gripping portion of the chuck body 39 and moves within a range where the fastener 40 abuts on the step 34a of the crown crown hole. Accordingly, the eraser 42 is fed out from the hole 34b at a pitch substantially equal to the movable range of the fastener 40.
[0022]
【The invention's effect】
With the above-described configuration, the metal writing instrument of the present invention greatly replaces metal parts with resin, simplifies the structure by omitting the number of parts, and facilitates assembly, resulting in significant cost reduction. Is done.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view showing an embodiment of the present invention, which is a partial cross section.
FIG. 2 is an explanatory view showing an engagement state between a protrusion of a cam portion and a circumferential groove of a central shaft.
FIG. 3 is an explanatory diagram showing another example of correspondence between the protrusion of the cam portion and the circumferential groove of the central shaft.
4 is a cross-sectional view of the main part of the engaging portion in FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Medium shaft 1 shaft Medium shaft 2 Guide part 3 Front shaft 4 Rear shaft 5 Cam part 6 Sliding piece 6 ｀ Sliding piece 7 Mechanical pencil writing body 8 Writing object 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 Gutter part 21a Inner surface part 21b Inner surface part 22 Protrusion part 23 Protrusion part 23 Protrusion 24 Core pipe 25 Flange part 26 Tail plug 27 Locking portion 28 Inner step portion 29 Step portion 30 Joint 31 Return spring 31 ｀ Return spring 32 Step portion 33 Hole 33 ｀ Hole 34 Crown 34a Step portion 34b Hole portion 35 Shaft portion 36 Locking portion 37 Locking portion 38 Clip 38基 Base 39 Chuck body 40 Fastener 41 Inner step 42 Eraser 43 Spring 44 Inclined surface 45 Narrow part 46 Wide groove 47 Narrow groove 48a Rear wall 48b Inclined After surface 48c wall 49 front wall 50 peripheral groove 51 guide groove 52 partition wall 53 inclined surface

Claims (2)

The tip of the front shaft and the middle shaft are fixed in a non-rotatable and retaining state, and a return spring is attached between the guide portion and the sliding piece in each of the guide grooves of the guide portion integrated with the middle shaft. It has a cam slope that is axially displaced and is mounted on the rear surface of the sliding piece or the front surface of the cam portion, and prevents the cam portion from coming off so as to be rotatable with respect to the guide portion or the middle shaft. By making each sliding piece and cam part come into contact with each other on the cam slant surface, the front and back of the writing body can be moved back and forth alternately by rotating the cam part with respect to the front shaft or the middle shaft. In the dual writing instrument, the rear crown has a hole at the rear end of the rear crown that is appropriately frictionally engaged with the eraser, and the chuck body is integrally formed with the eraser accommodating portion at the rear of the cam portion. The cam and chuck body are prevented from coming off and rotating against the rear axle. Together with the rear shaft to the chuck body in the state is made possible axial trend was, between the inner step of the front and rear axle the rear end of the chuck body spring is laid, the grip portion outer periphery of the chuck body rear end The eraser is gripped when the front end of the fitted fastener comes into contact with the rear end of the rear shaft and the gripping portion of the chuck body is tightened, and the fastener is stepped on the crown crown hole as the rear shaft moves. A writing instrument that allows the eraser to be fed out from the rear end hole of the crown at a pitch substantially equal to the movable range of the fastener , with the fastener being engaged and disengaged from the gripping portion within the movable range in contact with the clamp. The compound writing instrument according to claim 1, wherein at least one of the pencils is a pencil, and the cam portion, the chuck body, and the rear shaft are interlocked with each other so that the shaft can move.

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