JPH0733692U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] By rotating the cap with respect to the tip shaft or center shaft, the writing tip of a plurality of writing instruments such as ballpoint pens can be selectively retracted from the tip tip opening and the cap inner hole By moving the eraser holder arranged in the back and forth, it is possible to inexpensively and conveniently provide a compound writing instrument capable of feeding out the eraser from the rear end of the cap. [Structure] Main parts such as the front shaft, the center shaft with a guide cylinder, the cylindrical cam, and the cap extending rearward are resin molded products,
The front shaft is fixed to the front half of the center shaft, a cylindrical cam is rotatably attached to the rear end of the center shaft, and multiple writing instruments such as ballpoint pens are fitted in the guide groove of the guide cylinder so that it can move back and forth. Is rotatable at the rear end of the guide tube. Furthermore, by providing an appropriately long cap extending to the rear of the cylindrical cam and moving the eraser holder fitted in the inner hole of the cap back and forth with respect to the cap, the eraser can be retracted from the rear end, and the member is made of resin. It also enables simplification of the structure and improvement of the eraser feeding performance.

Description

[Detailed description of the device]

[0001]

[Industrial field of application]

 The present invention relates to the provision of a compound writing instrument in which the tips of a plurality of writing materials can be alternately retracted and retracted at the tip of the leading shaft and the eraser can be retracted and retracted from the rear end of the cap.

[0002]

[Prior art]

 Conventionally, as an example of a compound writing instrument, as shown in Japanese Utility Model Publication No. 64-3491 published by the same applicant, it has a sliding groove for guiding two writing instruments and is fixed to a leading shaft. It has a guide barrel and a cam slope that contacts the sliding commas attached to the two cursives fitted to the guide barrel at the front end, and the rear end serves as a knocking portion in the axial direction with respect to the cap. Equipped with a cylindrical cam mounted so that it can move freely and can rotate in the circumferential direction integrally, and two cursives can be selectively projected and retracted at the tip of the tip shaft by rotating the cap with respect to the tip shaft. There are multiple writing instruments. Further, as a cited example of the present application, as shown in Japanese Utility Model Laid-Open No. 60-120889 by the same applicant, a compound type in which a crown protruding from the rear end of the cap is rotated so that an eraser appears and disappears. Writing instruments exist.

[0003]

[Problems to be solved by the device]

 The above cited example has the first problem that metal parts are used in many parts, the structure is complicated, the number of parts is large, and the cost is high. In addition, since the crown protruding from the rear end of the cap is short, it is difficult to pinch it with fingers, and the second problem is that it is difficult to perform the operation of retracting the eraser.

[0004]

[Means for Solving the Problems]

 The compound writing instrument of the present invention devised to solve the above-mentioned problems is provided with engaging portions for fitting the tip of the resin-made front shaft and the tip of the resin-made center shaft in a non-rotatable and retaining state. Fix both. A guide tube integrated with the center shaft and a rearward side surface of the center shaft are provided with a substantially inverted T-shaped window portion in which a vertical groove and a peripheral groove are connected through a narrow portion, and slide into a plurality of guide grooves provided in the guide cylinder. A plurality of writing materials such as ballpoint pens with a moving top fixed to the rear end are fitted through a return spring so that they can be moved back and forth, respectively, and a cam bevel that axially displaces is formed on the front end of a circular cylindrical cam. A protrusion is provided on the side surface, and the protrusion is elastically fitted into the circumferential groove to prevent the cylindrical cam from rotating with respect to the guide cylinder and the center shaft rotatably within a certain range. By moving the moving pieces alternately in the front-back direction, the tip of each cursive body can be selectively retracted from the tip of the tip shaft, and an eraser is fastened to the cap of an appropriate length extending behind the cylindrical cam. The eraser holder is installed and And projecting and retracting the rear end hole of the cap rubber off by longitudinal movement of the rubber holder. As described above, since the compound writing instrument of the present application has a simple structure with a reduced number of parts, it is easy to assemble and the cost can be reduced. Further, the operation of feeding out the eraser is easy.

[0005]

【Example】

 1 and 2 show a first embodiment of the present invention. The compound writing instrument of the present embodiment is a center rod 1 integrally provided with a guide tube 2, a tip shaft 3, a cap 4 integrally provided with a cylindrical cam 5, a pair of sliding pieces 6, 6 ', a writing body 7 such as a ballpoint pen, The eraser holder 29 and eraser 40 are the main components. First, the center shaft 1 is made of resin and, as shown in FIG. 1, has a guide groove 8 which is long in the axial direction and opens on the side surface from the substantially central portion to the rear end, and a similar guide groove 8'on the side surface opposite thereto. A guide tube 2 is provided. The front half of the guide cylinder 2 is provided with a cylinder part 9 having a partition part 14 communicating with the guide grooves 8 and 8'and having holes 24 and 24 'and having a front end opened. A step portion 23 is provided at the rear end, and a bulging engagement portion 11 is formed on the front outer peripheral portion of the step portion 23.

In addition, as shown in FIG. 2, a vertical groove 16 is connected to the circumferential groove 17 on the rear side surface of the center shaft 1 via a forward inclined surface 34 and has a substantially inverted T shape. The window is perforated. As will be described later, the projection 15 of the cylindrical cam 5 is inserted from the vertical groove 16, and the projection 15 elastically expands the inclined surface 34 and passes through the narrow portion 35 to be defined by the rear wall 36 and the front wall 37. Enter the circumferential groove 17. The cylindrical cam 5 rotates within a range in which the projection 15 abuts on both circumferential walls of the circumferential groove 17, so that the writing tip portions of the writing bodies 7 and 7 ', such as a ballpoint pen, alternately project and retract from the tip tip opening. Become.

The front end of the front shaft 3 is tapered, and a tip opening through which a writing tip is projected and retracted is provided at the tip of the inner hole. The rear end hole is provided with an engagement groove 10 that engages with an engagement portion 11 provided on the outer peripheral portion of the tubular portion 9 of the guide tube to prevent the tubular portion 9 from coming off and preventing rotation. . The tubular portion 9 and the tip shaft 3 are detachably fixed with an appropriate force. (Same as the configuration of the front shaft in Japanese Utility Model Publication No. 64-3491)

The cap 4 is made of resin and has a cylindrical cam 5 integrally at its tip. The cylindrical cam 5 has a tubular shape, and has a cam slope 12 that is circumferentially displaced forward and backward at the front edge thereof, and a notch 13 is formed at the frontmost end of the cam slope 12. Further, on the side surface of the cylindrical cam 5, there is formed a projection 15 which is inserted into the vertical groove 16 of the center shaft 1 and elastically fits into the circumferential groove 17 so as to rotate and prevent from coming off within a certain range (approximately 180 degrees). There is.

By the way, the cap 4 has a cylindrical portion extending to the rear of the cylindrical cam 5, a slit 25 is formed on the side surface of the cylindrical portion, and projections 26 and grooves 27 alternate on both sides of the slit 25. Are provided in multiple rows. Further, an eraser holder 29 having an eraser 40 fixed to the rear end thereof is mounted in the cylindrical portion with an engaging projection 32 provided on the outer periphery thereof being removably fitted in the groove 27 of the slit 25. . The engaging projection 32 is formed on the tip of an elastic piece provided on the side surface of the eraser holder 29, and is engaged with the groove 27 while being elastically displaced in the groove 27 as it slides to hold the eraser 40 in a protruding state. The center of the engaging protrusion 32 is slightly projected to form the operation button 33, and the operation button 33 is moved back and forth to move the eraser holder 29 while releasing the engagement between the engaging protrusion 32 and the groove 27. It is possible. A crown 28 is fixed to the rear end of the cylindrical portion. The rear end portion 38 of the cylindrical portion and the contact portion 39 of the crown 28 are in a slanted shape and are substantially in contact with each other to prevent deformation of the rear end of the slit 25.

The sliding piece 6 has a protrusion 20 on the outer surface, and a central portion projects from the rear end face of the protrusion 20 and both sides of the protrusion 20 have substantially the same slope as the cam slope 12 of the cylindrical cam 5 described above. have. In addition, a locking portion 21 for fixing the rear end of the writing body 7 such as a ballpoint pen is provided at the tip. The sliding piece 6'is also provided in the same manner as the sliding piece 6, and the rear end of the writing body 7 ', such as a ballpoint pen, is fixed to the locking portion 21'.

Next, the assembly order will be described. The writing bodies 7 and 7 ′ such as a ballpoint pen are connected to the sliding pieces 6 and 6 ′ at their rear ends, respectively, and the guide grooves 8 of the guide cylinder 2 of the center shaft described above are connected. , 8'movably fitted, and backed by return springs 22,22 'interposed between the front end faces of the sliding pieces 6,6' and the guide groove 8,8'partition 14 at the front. Is urged to. For the cap 4, the cylindrical cam 5 is inserted into the rear end hole of the center shaft 1 and the protrusion 15 is elastically fitted into the circumferential groove 17, so that the cap 4 is rotatable about 180 degrees in the circumferential direction with respect to the center shaft 1 and is prevented from coming off. Be fastened. Further, since the sliding pieces 6 and 6'are always urged rearward by the return springs 22 and 22 ', the cam slopes of the projections 20 and 20' always contact the cam slope 12 of the cylindrical cam 5. The state is maintained.

Further, when the rear end surface of the front shaft 3 is in contact with the front surface of the stepped portion 23 of the center shaft 1, the engagement portion 11 of the tubular portion 9 is elastically fitted into the engagement groove 10 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 front axle 3 can be attached and detached with an appropriate force. In this state, when the cap 4 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 13 at the foremost end of the cam slope 12 of the cylindrical cam 5 has a writing material such as a ballpoint pen. The writing tip is locked by the projection 20 of the sliding piece 6 of FIG. When the cap 4 is rotated to the other side with respect to the front shaft 3 or the center shaft 1, the sliding piece 6 retracts, the writing tip of the writing body 7 such as a ballpoint pen is retracted from the tip end opening of the leading spindle, and the sliding piece is moved. 6 ”moves forward and the writing tip of the writing body 7” such as the other ballpoint pen projects from the tip end opening of the tip shaft.

On the other hand, the eraser holder 29 is fitted from the rear end of the tubular portion of the cap 4, and the engagement protrusion 32 of the eraser rubber holder 29 is engaged with the groove 27 of the slit 25 provided in the tubular portion to erase the eraser holder. 29 is slidable with respect to the tubular portion. Further, the crown 28 is fixed to the rear end of the cylindrical portion, and the eraser 40 is inserted from the opening of the rear end of the crown 28 so that the rear end of the eraser 40 is fixed to the eraser holder 29. As described above, when the eraser holder 29 is moved back and forth, the eraser 40 appears and disappears from the opening of the crown 28. The inner diameter of the opening of the crown 28 is slightly larger than the outer diameter of the eraser 40.

By the way, FIGS. 3 and 4 show a second embodiment of the present invention. Since this embodiment has many components in common with the first embodiment described above, only the differences will be described below. First, as shown in FIG. 4, a window portion having a substantially inverted T shape is formed on the rear side surface of the center shaft 1 '. Further, on the rear wall 36 'of the circumferential groove 17', protrusions 38 'and 39' are formed at appropriate positions sandwiching the narrow portion 35. The distance between the rear wall 36 'and the front wall 37' is set to be slightly larger than the projecting dimension of the protrusions 38 'and 39' with respect to the axial width of the protrusion 15 of the cylindrical cam.

The cap 4 ′ is made of resin, and a button 29 ′ having a notch on the front side surface and displaceable inward is provided. Inside the button 29 ′, a cylindrical portion of a cylindrical cam 5 ′ described later is provided. A push portion 30 "that engages by pushing force is formed at 26". Incidentally, an uneven portion or the like can be appropriately formed between the contact portions of the tubular portion and the pushing portion. Further, the inner groove has a concave groove 28 ', the spiral groove 27' is formed behind the concave groove 28 ', and the inclined contact portion 34' is formed at the rear end of the spiral groove 27 '. And a rear end hole 35 "is provided.

By the way, the cylindrical cam 5 ′ has a tubular portion 26 ′ extending rearward, and the tubular portion 26 ′ is substantially in contact with the contact portion 34 ′ of the cap 4 ′ together with the hole portion through which the eraser 42 is inserted. It also has a slanted rear end portion 25 "which contacts, and a long slit 19" is formed in the outer peripheral portion toward the collar portion 18 "and the rear end portion 25". Further, the eraser holder 31 'has a pair of elastic pieces 40' which sandwiches the rear end of the eraser 42 at the rear side and a locking projection 41 on the inner surface thereof which appropriately bites into the outer surface of the eraser 42. A pair of protrusions 33 'are provided on the side surface of the 32' coaxially with the elastic piece 40 '. The rear end 25 'of the tubular portion 26' and the abutting portion 34 'of the cap 4'inclined to be in a substantially abutting state in order to suppress the deformation of the rear end of the slit 19'. is there.

Explaining in the order of assembling, an eraser holder 31 ″ is inserted from the rear end of the cylindrical portion 26 ″ of the cylindrical cam 5 ″, and the protrusion 33 ″ and the elastic piece 40 ″ are fitted into the slit 19 ″. An eraser 42 is fixed to the rear end of the eraser holder 31 ', the cap 4'is inserted into the tubular portion 26' from the front end, and the flange 18 'is elastically deformed to fit into the groove 28' of the cap. Further, the protrusion 33 'is fitted into the spiral groove 27' while the front end of the eraser holder 31 'is in contact with the step portion of the slit 19' front end. (To be exact, the cap 4'rotates slightly with respect to the cylinder 26 'so that the projection and the spiral groove come into contact with each other.) As described above, the cylinder 26' comes into contact with the rear end 25 'of the cap 4'. The cap 4'is rotatably attached to the cap 4'while being substantially in contact with the portion 34 ', and is prevented from coming off. The cylindrical portion 26 'having the slit 19' is delicate and easily deformed. However, since the slanted rear end portion 25 'and the abutment portion 34' are prevented from deforming inward, the cylindrical portion 26 'is not attached. Stabilizes.

[0018]

[Action]

 In the first embodiment, when the cap 4 is rotated to one side with respect to the front shaft 3 or the center shaft 1, the notch 13 provided at the tip of the cam slope 12 of the cylindrical cam 5 is removed as shown in FIG. By engaging with the sliding piece 6 of the writing body 7 such as one of the ballpoint pens, the tip of the writing is projected from the tip of the tip shaft. Further, when the cap 4 is rotated to the other side with respect to the front shaft 3 or the center shaft 1, the writing body 7 such as a ballpoint pen retracts, and instead the writing tip of the writing body 7 such as a ballpoint pen projects from the tip end opening of the front axle.

Next, when the operation button 33 of the eraser holder 29 is pushed and retracted with respect to the cap 4, the engaging protrusion 32 moves away from the groove 27 of the slit 25, so that the eraser holder 29 is gradually retracted. Then, the eraser 40 is extended from the opening of the crown 28. Further, when the operation button 33 is pushed forward, the eraser holder 29 moves forward, and with it, the eraser 40 retracts from the opening of the crown 28.

In the second embodiment, when the button 29 ′ is pressed and the cap 4 ′ is rotated to one side while pressing the cap 4 ′ against the front shaft 3 or the center shaft 1 ′, the pushing part 30 ′ is pressed. Engages with the side surface of the tubular portion 26 ", and the cylindrical cam 5" and the cap 4 "are integrated in the rotational direction. Further, as shown in Fig. 4, the projection 15 is brought into contact with the front wall 37". The rotation-prevented state of the protrusion 38 'with respect to the protrusion 15 is released.) As shown in Fig. 3, the writing tip of the writing body 7 such as one ball-point pen projects from the tip end opening of the tip shaft. In the same manner, when the cap 4 ′ is rotated to the other side, the writing body 7 such as a ballpoint pen retracts, and instead the writing tip of the writing body 7 such as a ballpoint pen projects from the tip end tip opening.

Next, when the cap 4 ′ (the button 29 ′ is not pressed) is rotated with respect to the front shaft 3 or the center shaft 1 ′, the eraser 42 appears and disappears from the rear end hole 35 ′ of the cap. Further, at this time, as shown in FIG. 4, the protrusion 15 is appropriately prevented from rotating by the protrusion 38 'or 39', so that the cylindrical cam 5'is fixed to the center shaft 1'and the cap 4'rotates.

In the second embodiment, an appropriate frictional resistance is provided between the cylindrical portion 26 ″ and the cap 4 ″, and the frictional resistance causes the sliding pieces 6, 6 ″ to move back and forth. If the rotation resistance is larger than the rotation resistance of the cylindrical cam 5 ', the button 29' is not necessary. Further, the cylindrical cam 5'has an appropriate rotation resistance due to the sliding pieces 6, 6'and the notches 13 engaging with each other through the return springs 22, 22 ', so that the rotation resistance pushes the button 29'. If the rotation resistance between the cylindrical portion 26 'and the cap 4'in the non-pressed state is made larger, the above-mentioned protrusions 38' and 39 'are unnecessary. However, considering the design variations, it is desirable to provide the button 29 'and the protrusions 38' and 39 '.

[0023]

[Effect of device]

 As described above, according to the present invention, the center shaft integrally provided with the front shaft and the guide portion is made of a resin molded product, and the protrusion 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 center shaft is integrally provided with the engaging portion that joins the front shaft and the cap, the number of parts is omitted as compared with the conventional double writing instrument, the structure is simplified, and the assembly is easy and the cost is reduced. Reduction is achieved. In addition, an eraser holder with an eraser attached is placed in the inner hole of an appropriately long resin cap that extends behind the cylindrical cam, and the eraser can be retracted from the rear end of the cap by moving the eraser holder back and forth. With this configuration, metal parts are replaced with resin compared to the conventional reference example, and the number of parts is reduced. Further, since the assembly is facilitated, the cost reduction is achieved and the product can be provided at a low cost. Also, the operability of feeding out the eraser is good. In particular, the combination with a writing instrument such as a ballpoint pen that can be erased with an eraser will provide even greater convenience.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of an entire main part showing a first embodiment of the present invention.

FIG. 2 is an explanatory view showing an engagement state between a cylindrical cam and a center shaft in FIG.

FIG. 3 is a longitudinal cross-sectional view of an entire main part showing a second embodiment of the present invention.

FIG. 4 is an explanatory view showing an engaged state of a cylindrical cam and a center shaft in FIG.

[Explanation of symbols]

 1 Middle shaft 1'Middle shaft 2 Guide cylinder 3 Tip shaft 4 Cap 4'Cap 5 Cylindrical cam 5'Cylindrical cam 6 Sliding piece 6'Sliding piece 7 Writing material such as ballpoint pen 7 Writing material such as ballpoint pen 8 Guide groove 8'Guide groove 9 Cylindrical part 10 Engagement groove 11 Engagement part 12 Cam slope 13 Notch 14 Partition part 15 Protrusion 16 Vertical groove 17 Circumferential groove 17 'Circumferential groove 18 Wall 18' Collar part 19 Window 19 'Slit 20 Protrusion 20' Protrusion 21 Locking Part 21 'Locking part 22 Return spring 22' Return spring 23 Step part 24 Hole 24 'Hole 25 Slit 25' Rear end 26 Protrusion 26 'Cylindrical part 27 Groove 27' Spiral groove 28 Crown crown 28 'Concave groove 29 Eraser holder 29 "Button 30 Fitting part 30" Pushing part 31 Elastic piece 31 "Eraser holder 32 Engagement protrusion 32" Cylindrical part 33 Operation button 33 "protrusion 34 Inclined surface 34 'Abutment part 35 Narrow part 35' Rear end hole 36 Rear wall 36 'Rear wall 37 Front wall 37' Front wall 38 Rear end 38 'Projection 39 Contact part 39' Projection 40 Eraser 40 ｀ Elastic piece 41 Locking protrusion 42 Eraser

Claims (1)

[Scope of utility model registration request] 1. A guide cylinder and a center shaft integrated with the center shaft by respectively providing engaging portions for fitting the resin-made front shaft and the resin-made center shaft ahead of each other in a non-rotatable and slip-out preventive state. A substantially inverted T-shaped window is formed on the rear side surface of the guide, connecting a vertical groove and a peripheral groove at a narrow portion, and a plurality of guide grooves of the guide cylinder are fixed with sliding pieces at the rear end. The ballpoint pen and other writing materials are urged by return springs between the guide cylinder and the sliding piece so that they can be moved back and forth in the axial direction, respectively. A protrusion is provided on the side surface of the cylindrical cam provided in the above, and the protrusion is elastically fitted into the circumferential groove through the vertical groove so that the cylindrical cam is rotatably retained within a certain range with respect to the guide cylinder and the center shaft. By bringing the sliding piece into contact with the cam slope of the cylindrical cam, the cylindrical cam can rotate with respect to the front shaft or the center shaft. By rotating each sliding piece alternately in the front-back direction, the tip of each cursive body can be selectively withdrawn from the tip of the tip shaft, and inside the cap of an appropriate length that is provided behind the cylindrical cam. An eraser holder to which an eraser is attached is arranged, and the eraser holder is moved back and forth with respect to the cap so that the eraser can be retracted from the rear end hole of the cap.