JPH10186U - Double writing instrument - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] By rotating the cap with respect to the front shaft or the center shaft, the tips of a plurality of cursive objects can be selectively protruded and retracted from the front shaft front end port. It is possible to provide an inexpensive double-type writing instrument that allows the eraser to appear and disappear by rotating the crown at the rear end. [Constitution] In a double-type writing instrument, at least one is a mechanical pencil writing body, and a cylindrical cam is axially shifted with respect to a center axis so that a core can be extended, and a crown 34 can be rotated only on a cap 4. And an elastic portion for sandwiching an eraser 45 in the cylindrical portion of the cylindrical cam 5 and the front cylindrical portion 41.
An eraser holder 40 having a projection 42 is mounted with the projection 42 fitted in the slit 37 and the spiral groove 36.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to the provision of a double-type writing instrument in which the tips of a plurality of writing bodies are made to be able to come and go alternately at a tip end of a front shaft and an eraser is made to come and go from the rear end of a cap.

[0002]

[Prior art]

 Conventionally, as an example of a double-type writing instrument, as shown in Japanese Utility Model Publication No. 64-3491 published by the same applicant, the writing instrument has a sliding groove for guiding two writing bodies and is fixed to a front shaft. The front end has a guide cylinder and a cam slope contacting a sliding frame attached to two writing bodies fitted to the guide cylinder, and the rear end forms a knocking part and is axially moved with respect to the cap. Equipped with a cylindrical cam mounted so that it can move freely and rotate in the circumferential direction as one unit. By turning the cap with respect to the front shaft, two writing bodies can be selectively protruded and retracted at the front end of the front shaft. There is a double writing implement. Further, as a cited example of the present application, as shown in Japanese Utility Model Application Laid-Open No. 60-120889 by the present applicant, a double crown in which an eraser is projected and retracted by rotating a crown protruding from the rear end of the cap. There is a writing implement.

[0003]

[Problems to be solved by the invention]

 The above cited examples have problems in that metal parts are used in many parts, the structure is complicated, the number of parts increases, and the cost increases.

[0004]

[Means for Solving the Problems]

 The dual writing implement of the present invention devised to solve the above-mentioned problem is provided with an engagement portion for fitting the front end of the resin-made front shaft and the front end of the resin-made middle shaft to each other in a non-rotatable and retaining state. Both were fixed. A substantially L-shaped window that connects the vertical groove and the circumferential groove through a narrow portion is drilled in the guide cylinder integrated with the central shaft and the rear side surface of the central shaft, and slides in the multiple guide grooves provided in the guide cylinder. At least one pencil with the top secured to the rear end is a mechanical pencil.A plurality of writing bodies, each of which is a pencil, are fitted via a return spring so as to be able to move back and forth, and the cam slope displaced in the axial direction is circumferentially attached to the front end. A protrusion is provided on the side surface of the cylindrical cam provided in a shape, and the protrusion is elastically fitted into the circumferential groove to prevent the cylindrical cam from rotating and moving in a certain range with respect to the guide cylinder and the center shaft so that the shaft can be shifted. Alternatively, by rotating the cylindrical cam with respect to the center shaft, each sliding piece is alternately moved in the front-rear direction so that the tip of each writing body can be selectively made to protrude and retract from the tip end of the front shaft, and only when the mechanical pencil is selected. The core is extended by changing the axis of the cylindrical cam. In addition, a cylindrical portion having a slit at the rear of the cylindrical cam and a cap integrally having the cylindrical portion outside the cylindrical cam are provided. On the other hand, a spiral groove is formed in the inner hole portion with a resin crown, and the cap is formed. The crown was fitted with the cylindrical portion of the cylindrical cam fitted to the inner hole of the cylindrical cam, the crown was secured to the cap so that it could only rotate, and the eraser was further secured within the cylindrical portion of the cylindrical cam. The eraser holder fits its protrusion into the slit and spiral groove, and the tip of the cursive writing comes out by rotating the cap with respect to the front or center shaft, and the eraser can come out by rotating the crown with respect to the cap. It is configured so that As described above, the dual writing instrument of the present invention has a simple structure with a reduced number of components, so that the assembly is easy and the cost can be reduced. Further, according to the embodiment described later, the projection of the cylindrical cam is designed not to contact the front wall of the peripheral groove even if a drop impact is applied to the rear end of the cap, so that the projection and the like are prevented from being broken.

[0005]

【Example】

 1 and 3 show an embodiment of the present invention. The dual writing instrument of the present invention has a center shaft 1, a front shaft 3, and a cap 4 with a cylindrical cam 5 integrally provided with a guide cylinder 2 as a guide. A pair of sliding pieces 6, 6, a mechanical pencil writing instrument 7, The main components are a writing body 8 such as a ballpoint pen, a crown 34, an eraser holder 40, and an eraser 45. First, the center shaft 1 is made of resin, and as shown in FIG. 1, has a guide groove 9 which is long in the axial direction and opens on the side surface from a substantially central portion to a rear end, and a similar guide groove 9 ｀ on the opposite side surface. A guide tube 2 is provided. In the front half of the guide tube 2, there is provided a tube portion 10 having a partition 16 having holes 32, 32 し て communicating with the respective guide grooves 9, 9 ｀ and having an open front end. A stepped portion 31 is provided at the rear end, and a bulging engagement portion 13 is formed on a front outer peripheral portion of the stepped portion 31.

On the rear side surface of the central shaft 1, as shown in FIG. 2, a vertical groove 18 is connected to a circumferential groove 19 via an inclined surface 46 on the front side, and a substantially L-shaped window is formed. The part is perforated. As will be described later, the projection 17 of the cylindrical cam 5 is inserted through the vertical groove 18, and the projection 17 elastically expands the inclined surface 46, passes through the narrow portion 47, and enters the circumferential groove 19. The cylindrical cam 5 rotates while the projection 17 abuts on the rear wall in the circumferential direction of the circumferential groove 19, and the writing portion 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. The circumferential groove 19 is provided with a wide groove 48 so that the cylindrical cam 5 can be axially shifted at the position of the projection 17 when the mechanical pencil 7 protrudes. The inclined surface 50b is connected between the rear wall 50a and the rear wall 50c of the circumferential groove 19 so that the cylindrical cam 5 cannot move substantially in the axial direction at the position of the protrusion 17 when the protrusion protrudes. Is provided. Further, as will be described later, the wall 20 of the cap 4 is set so as to contact the rear end of the center shaft 1 at the front end of the shaft transition, and the front end of the projection 17 does not contact the front wall 51 of the circumferential groove 19.

The front end of the front shaft 3 is tapered, and the front end of the front end is provided with an inner step 27 at the front end of the inner hole. The rear end hole is provided with an engagement groove 12 which engages with an engagement portion 13 provided on the outer peripheral portion of the cylindrical portion 10 of the guide cylinder, and prevents the cylindrical portion 10 from slipping out and rotating. I have. The cylindrical portion 10 and the front shaft 3 are detachably fixed by an appropriate force. (Same as the configuration of the front shaft in Japanese Utility Model Laid-Open No. 64-3491)

The cap 4 is made of resin, and has a circumferential wall 20 integrally supporting the cylindrical cam 5 in the inner hole at the front. Further, a protruding engagement portion 33 is formed on the slightly smaller diameter shaft portion 4b behind the outer peripheral portion. The cylindrical cam 5 has a cylindrical shape, and has a cam slope 14 which is circumferentially displaced forward and backward at a front end edge, and a notch 15 is formed at the foremost end of the cam slope 14. On the side surface of the cylindrical cam 5, a projection 17 is formed which is inserted into the vertical groove 18 of the center shaft 1, elastically fits into the circumferential groove 19, and prevents rotation and removal within a certain range (approximately 180 degrees). ing.

The cylindrical cam 5 has a tubular portion extending rearward, and further has a long slit 37 formed behind the stepped portion 38. On the other hand, the crown 34 made of resin has an outer cylindrical portion 34a formed at the rear, and an inner cylindrical portion 35 is provided toward the front inside the outer cylindrical portion 34a, and a spiral groove 36 is formed in the inner hole of the inner cylindrical portion 35. Are formed. An engaging portion 34b having a circumferential groove is formed on the inner surface of the outer cylindrical portion 34a.

Meanwhile, the inner cylindrical portion 35 of the crown 34 is fitted in the rear inner hole of the cap 4 in a state of being fitted on the outer periphery of the cylindrical portion having the slit 37, and the engaging portion of the outer cylindrical portion 34 a is fitted. The cap 34 is elastically fitted to the engaging portion 33 of the shaft 4b of the cap, and the crown 34 is fixed to the cap 4 so as to be rotatable only.

In addition, an eraser holder 40 having an eraser 45 fixed to the rear end is mounted in the cylindrical portion having the slit 37 of the cylindrical cam. The eraser holder 40 is formed with a pair of elastic pieces 43 sandwiching the eraser 45 at the rear, and has an engagement projection 44 on the inner surface of the elastic piece 43. A projection 42 is formed on the outer periphery of the front cylindrical portion 41. The eraser holder 40 has a protrusion 42 and an elastic piece 43 fitted in the slit 37 of the cylindrical portion, and the protrusion 42 is further disposed in the spiral groove 36 of the crown 34 in the cylindrical portion. In this state, when the outer cylindrical portion 34 a of the crown is rotated with respect to the cap 4, the eraser holder 40 moves back and forth, and the eraser 45 can be protruded and retracted from the rear end hole 39 of the crown.

The sliding piece 6 has a projection 22 on the outer surface, a central portion protruding from the rear end surface of the projection 22, and both sides thereof have substantially the same gradient as the cam slope 14 of the cylindrical cam 5 described above. It has a slope. Further, a hole is provided in contact with the flange portion 24 of the core pipe 23 to protrude and fit the rear of the core pipe 23 long. Like the sliding piece 6, the sliding piece 6 # has a projection 22 # and a cam slope, and a leading end is provided with a locking portion 26 for fastening the rear end of the writing body 8 such as a ball-point pen. Incidentally, the locking portion may be formed in a pipe shape and the rear end of the cursive body may be fitted.

[0013] The mechanical pencil 7 has a built-in general chuck mechanism, is joined to the core pipe 23 via a joint 29 connected to the chuck mechanism at the rear end, and has a flange portion provided behind the core pipe 23. The sliding piece 6 is fitted in contact with the sliding piece 24, 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 with the step 28 at the tip of the mechanical pencil 7 in contact with the inner step 27 of the front shaft 3.

Next, a description will be given in assembling order. A writing body 8 such as a mechanical pencil 7 and a ballpoint pen is connected to respective sliding pieces 6, 6 に at a rear end, and each of the guide shafts 2 of the center shaft described above is connected. Return springs 30, 30 さ れ which are movably fitted in the guide grooves 9, 9 、 and are interposed between the front end surfaces of the sliding pieces 6, 6 と and the partition 16 on the front surface of the guide grooves 9, 9 ｀. It is urged backward by.

On the other hand, an eraser holder 40 in which an eraser 45 is fixed is fitted in a cylindrical portion having a slit 37, and the cap is attached in a state where the inner cylindrical portion 35 of the crown 34 fits the cylindrical portion of the cylindrical cam 5. The crown 34 is fitted to the inner hole of the cap 4 so as to be rotatable only on the cap 4. At that time, the projection 42 of the eraser holder 40 is elastically fitted into the spiral groove 36. (There is an operation of fitting the crown 42 while rotating the crown 34 as appropriate to fit the projection 42 into the spiral groove 36.) As described above, when the outer cylindrical portion 34a of the crown is rotated left and right with respect to the cap 4, The eraser 45 protrudes from the end hole 39.

From this state, the cylindrical cam 5 is inserted into the rear end hole of the central shaft 1 to elastically fit the projection 17 into the circumferential groove 19, and is rotatable at 180 degrees in the circumferential direction with respect to the central shaft 1. Stop and secure. In a state where the mechanical pencil 7 is protruded, the cap 4 can be shifted by the stroke required for centering the center shaft 1 with respect to the center shaft 1. In this state, axis transition is not allowed. Since each sliding piece 6, 6 # is always urged rearward by the return spring 30, 30 #, the cam slopes of the projections 22, 22 # are always kept in contact with the cam slope 14 of the cylindrical cam 5. ing.

The engaging portion 13 of the cylindrical portion 10 is elastically fitted into the engaging groove 12 of the front shaft 3 with the rear end surface of the front shaft 3 in contact with the front surface of the step portion 31 of the center shaft 1. Thus, the front shaft 3 and the center shaft 1 are fixed in a state where rotation is prevented and the shaft is prevented from coming off. The tip shaft 3 is detachable with an appropriate force. When the cap 4 is rotated in one direction with respect to the front shaft 3 or the center shaft 1 in this state, the sliding commander 6 moves forward and the notch 15 at the foremost end of the cam slope 14 of the cylindrical cam 5 becomes one of the sharp pencil writing objects. 7 is locked to the projection 22 of the sliding piece 6 so that the writing tip projects from the tip end of the front shaft. Further, when the cap 4 is rotated to the other end with respect to the front shaft 3 or the center shaft 1, the sliding piece 6 is retracted, and the writing tip of the mechanical pencil 7 penetrates from the tip end of the tip shaft. 6 ｀ advances, and the writing tip of the writing body 8 such as a ballpoint pen projects from the tip end of the front shaft.

FIGS. 3 and 4 show another example of the engagement between the projection 17 of the cylindrical cam and the center shaft 1 °. In this case, as a means for fitting the projection 17 into the circumferential groove 60, a partition wall 62 having an inclined surface 63 is provided on the upper wall of the guide groove 61 for fitting the projection 17 from the rear end of the central shaft 1 軸. I have. The reason for providing the partition wall 62 is to enhance the rigidity of the center shaft 1 ° at the engaging portion.

[0019]

[Action]

 When the cap 4 is rotated in one direction with respect to the front shaft 3 or the center shaft 1, a notch 15 provided at the tip of the cam slope 14 of the cylindrical cam 5 makes the sliding piece of one mechanical pencil writing body 7 as shown in FIG. 6 and the writing tip protrudes from the tip end of the front shaft. At this time, the projection 17 of the cylindrical cam 5 is located in the wide groove 48 in the circumferential groove 19 of the center shaft 1. In this state, when the rear end of the crown 34 is knocked and the cylindrical cam 5 is moved axially, the operation is transmitted to the sliding top 6, the core pipe 23, and the mechanical pencil 7, and the step 28 of the writing tip is moved. The chuck is axially advanced together with the joint 29 from the state in which it comes into contact with the inner step portion 27 of the front shaft 3, and the core is extended. Also, when the cap 4 is rotated to the other end with respect to the front shaft 3 or the center shaft 1, the mechanical pencil 7 is retracted, and the writing tip of the writing body 8 such as a ballpoint pen projects from the tip of the front shaft. When the writing body is stored or when the writing body such as a ball-point pen is projected, the projection 17 is located in the narrow groove 49 of the circumferential groove 19 and knocks, and the wall 20 of the cap 4 hits the rear end of the center shaft 1. Since the projections 17 do not contact the front wall 51 of the circumferential groove 19 in the contact state, the projections and the like do not break. Next, when the outer cylindrical portion 34 a of the crown is rotated left and right with respect to the front of the cap 4, the eraser holder 40 moves forward and backward, and the eraser 45 protrudes and retracts from the rear end hole 39.

[0020]

[Effect of the invention]

 As described above, according to the present invention, a cylindrical portion having a slit is provided at the rear of the cylindrical cam, and a resin cap having the cylindrical portion is provided outside the cylindrical portion, and a spiral groove is formed in the inner hole portion. The formed resin crown was fitted to the cap in a state of being fitted to the cylindrical part of the cylindrical cam, and the crown was fixed to the cap so that it could rotate only, so that the metal was smaller than in the conventional example. It is replaced with resin, the number of parts is omitted, the structure is simplified, and assembling is facilitated and cost reduction is achieved. Further, according to the embodiment, the center shaft provided integrally with the front shaft and the guide portion is formed as a resin molded product, and the projection provided on the side surface of the cylindrical cam is elastically fitted into the circumferential groove formed at the rear of the center shaft. In addition, since the central shaft is integrally provided with an engaging portion to be joined to the front shaft, the number of parts is reduced with respect to the conventional double-type writing instrument, the structure is simplified, and assembly is facilitated, and further cost is increased. Reduction is achieved. Further, even when an impact such as a rear end drop is applied, the projection for locking the cylindrical cam and the center shaft does not abut against the front wall of the circumferential groove, thereby preventing a problem such as breakage.

[Brief description of the drawings]

FIG. 1 is a longitudinal cross-sectional view of an entire main part 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]

 DESCRIPTION OF SYMBOLS 1 Middle shaft 1 ２ Middle shaft 2 Guide cylinder 3 Front shaft 4 Cap 4a Cylindrical part 4b Shaft part 5 Cylindrical cam 6 Sliding piece 6 ｀ Sliding piece 7 Pencil writing body 8 Writing body such as ballpoint pen 9 Guide groove 9 ｀ Guide groove 10 cylinder Part 11 Knock spring 12 Engagement groove 13 Engagement part 14 Cam slope 15 Notch 16 Partition part 17 Projection 18 Vertical groove 19 Peripheral groove 20 Wall 21 Window 22 Projection 22 ｀ Projection 23 Core pipe 24 Flange part 25 Tail plug 26 Locking part 27 inner step part 28 step part 29 joint 30 return spring 30 リ タ ー ン return spring 31 step part 32 hole 32 係 合 hole 33 engaging part 34 crown 34a outer cylinder part 34b engaging part 35 inner cylinder part 36 spiral groove 37 slit 38 step Part 39 rear end hole 40 eraser holder 41 cylindrical part 42 protrusion 43 elastic piece 44 locking protrusion 45 eraser 46 inclined 47 Habasema portion 48 Habahiromizo 49 Habasemamizo 50a rear wall 50b inclined face 50c rear wall 51 front wall 60 peripheral groove 61 guide groove 62 partition wall 63 inclined surface

Claims (1)

[Utility model registration claims] 1. A guide in which a resin-made front shaft and a resin-made middle shaft are provided with engaging portions which are fitted to each other in a non-rotatable and non-removable state, and are fixed to each other. A cylinder with a cam slope displaced in the axial direction provided circumferentially at the front end, with the sliding piece provided at the rear end of the cursive body being urged by a return spring to allow only a forward and backward movement. The cam is rotatably retained with respect to the center shaft, and each sliding piece is brought into contact with the cam slope to alternately move back and forth by the rotation of the cylindrical cam with respect to the front shaft or the center shaft, and the tip of each writing body to the front shaft. In a double-type writing instrument that can be selectively protruded and retracted from the front end of the cylinder, at least one of the pencils is a pencil pencil, and the cylindrical cam is axially shifted with respect to the center axis so that the core can be fed out. A cylindrical portion having a slit 37 behind the cam 5; A resin cap 4 is provided integrally on the outside of the outer cap, and a resin crown 34 is provided. A helical groove 36 is formed in the inner hole of 35,
The inner cylindrical portion 35 of the crown is fitted with the cylindrical portion of the cylindrical cam 5 fitted in the rear inner hole of the cap 4.
4 is fixed so as to be rotatable only, and an eraser holder 40 having an elastic portion for sandwiching an eraser 45 in the cylindrical portion of the cylindrical cam 5 and a projection 42 in the front cylindrical portion 41 spirals the projection 42 with the slit 37. It is attached in the state fitted in the groove 36,
By rotating the cap 4 with respect to the front shaft 3 or the center shaft 1, the tip of the cursive writing penetrates, and by rotating the outer cylindrical portion 34 a of the crown 34 with respect to the cap 4, the eraser 45 can be retracted. A dual-purpose writing instrument characterized by the following.