JPH0595788U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] Rotate the cap by pressing the button on the tip shaft or center shaft, and at the same time, selectively write multiple cursive bodies, one of which is a mechanical pencil cursive body, from the tip of the tip shaft. , Is a compound writing instrument in which the cap is rotated without pressing the button so that the eraser appears and disappears from the rear end. By omitting the members and improving the assembly structure, it is possible to provide inexpensive and convenient. [Structure] Main parts such as a front shaft 3 and a center shaft 1 in which a guide cylinder 2 is integrated, a cylindrical cam 5 having a cylinder portion 5 ', a cap 4 having a spiral groove 33 are resin molded products, and the front side of the center shaft 1 While fixing the front shaft 3 to the rear end, a cylindrical cam is fixed to the rear end of the center shaft so as to rotate and move the shaft, and a plurality of cursive bodies are fitted in the guide groove of the guide cylinder 2 so as to be movable back and forth. The tubular portion extending to the rear of the cam is provided with the brim portion 32 and the slit 31, and the eraser holder 39 having the eraser 52 fixed thereto is fitted on the tubular portion to prevent the cap from freely rotating with respect to the tubular portion. When the button provided on the side surface of the cap is pressed, the tubular portion is fixed, and the cap is rotated to allow each cursive body to appear and disappear, and when the button is rotated without being pressed, the eraser can appear and disappear.

Description

[Detailed description of the device]

[0001]

[Industrial use field]

 The present invention relates to 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 front shaft, and an 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 cursive bodies 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 as a unit. By rotating the cap with respect to the tip shaft, two writing instruments can be selectively retracted at the tip end of the tip shaft. There are multiple writing instruments. Further, as a cited example of the present application, as seen 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 pick it up with a finger, and it is difficult to operate the eraser to move in and out.

[0004]

[Means for Solving the Problems]

 The multiple writing instrument of the present invention devised to solve the above-mentioned problems is provided with engaging portions for fitting the resin-made tip shaft and the tip of the center shaft to each other so that they cannot rotate and do not come off. Be fixed. A guide tube that is integrated with the center shaft and a substantially inverted T-shaped window that connects a vertical groove and a peripheral groove through a narrow portion are bored on the rear side surface of the center shaft, and slides on the guide grooves provided on the guide cylinder. Plural cursive bodies, at least one of which has a moving top fixed to the rear end, are used as mechanical pencil cursives, and are fitted in the front end part so that they can be moved back and forth through return springs. A protrusion is provided on the side surface of the cylindrical cam, 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 in a certain range and allowing the shaft to move. The sliding cams are alternately moved in the front-rear direction by the rotation of the cylindrical cam with respect to, and the tip of each cursive body can be selectively retracted from the tip end opening of the tip shaft, and the cylindrical cam shifts when the mechanical pencil is selected. To extend the core. In addition, a flange and a slit are provided on the cylindrical part extending to the rear of the cylindrical cam, and there is a button on the side surface of the cap that is displaced inward by pressing, and the spiral groove in the inner hole and the rear end of the spiral groove. Eraser Equipped with a hole for insertion and exit and a groove at the front end, insert the cylinder into the cap and fit the collar into the groove so that the cylindrical cam is rotatable with respect to the cap and cannot be removed. When the eraser holder is fixed, the protrusion provided on the outer periphery of the eraser holder is fitted into the slit and the spiral groove, and when the cap is rotated with respect to the front shaft and the center shaft, the eraser holder moves back and forth and the eraser appears and disappears from the rear end of the cap. When the cap is rotated while the button is being pressed, the pushing part inside the button engages with the tubular part, and the cylindrical cam and cap are integrated in the rotational direction so that the tip of each cursive body can appear and disappear. ..

[0005]

【Example】

 Embodiments will be described below with reference to the drawings. The compound writing instrument of the present invention includes a center shaft 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 commas 6, 6 ', a mechanical pencil writing body 7, a ballpoint pen. The writing body 8, the eraser holder 39, and the eraser 52 are the main constituent elements. First, the center shaft 1 is made of resin, and as shown in FIG. 1, a guide groove 9 is formed in the side surface from the center to the rear end, which is long in the axial direction, and a similar guide groove 9'on the side surface opposite to the guide groove 9. A guide tube 2 having the same is provided. In the front half of the guide cylinder 2, there is provided a cylinder part 10 having a partition 16 having holes 30 and 30 ′ communicating with the guide grooves 9 and 9 ′ and having a front end opened. A step portion 29 is provided at the rear end, and a bulging engagement portion 13 is formed on the front outer peripheral portion of the step portion 29.

In addition, as shown in FIG. 2, a vertical groove 18 is connected to the circumferential groove 19 through a front inclined surface 45 on the rear side surface of the center shaft 1 to form a substantially inverted T shape. The window is perforated. As will be described later, the protrusion 17 of the cylindrical cam 5 is inserted from the vertical groove 18, and the protrusion 17 elastically expands the inclined surface 45, passes through the narrow portion 46, and enters the circumferential groove 19. The cylindrical cam 5 rotates within a certain range (approximately 180 degrees) in which the protrusion 17 abuts on both walls in the circumferential direction of the circumferential groove 19, and the writing portion of the writing instrument 7 such as the mechanical pencil writing instrument 7 or the ballpoint pen is the tip of the tip of the tip shaft. It will appear alternately from the. Further, the circumferential groove 19 is provided with a wide groove 47 so that the cylindrical cam 5 can be axially moved at the position of the protrusion 17 when the mechanical pencil writing body 7 is projected. A narrow groove 48 is provided in the rear wall 50 and the front wall 49 of the circumferential groove 19 so that the cylindrical cam 5 cannot substantially move axially at the position of the protrusion 17 when the body 8 projects. Further, on the rear wall 50, projections 51 and 51 'are formed at appropriate positions sandwiching the narrow portion 46.

The front end of the tip shaft 3 is tapered, and the tip end of the inner hole has an inner step portion 25 and is provided with a tip opening. Further, the rear end hole is provided with an engagement groove 12 that is engaged with an engaging portion 13 provided on the outer peripheral portion of the tubular portion 10 of the guide tube to prevent the tubular portion 10 from coming off and preventing rotation. There is. The tubular portion 10 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 button 37 that has a notch on the front side and can be displaced inward. Inside the button 37, a button 5'of a cylindrical cam 5 described later is provided. A pressing portion 38 that is engaged by pressing is formed. Further, there is a concave groove 34 in the inner hole from the front side, a spiral groove 33 is formed behind the concave groove 34, and an inclined contact portion 36 is provided at the rear end of the spiral groove 33 and opened at the rear end. An eraser withdrawal hole 44 is provided.

By the way, the cylindrical cam 5 has a tubular portion 5 ″ extending rearward, and the tubular portion 5 ″ substantially abuts the abutting portion 36 of the cap 4 together with a hole portion through which the eraser 52 is inserted. It also has a tilted rear end portion 35, and a long slit 31 is formed in the outer peripheral portion toward the brim portion 32 and the rear end portion 35. Further, the eraser holder 39 has a pair of elastic pieces 42 which sandwich the rear end of the eraser 52 on the rear side, and a locking projection 43 which appropriately bites into the outer surface of the eraser 52 on the inner surface thereof, and the front cylindrical portion 40. A pair of protrusions 41 are provided on the side surface of the same coaxially with the elastic piece 42. The rear end portion 35 of the tubular portion 5 and the abutting portion 36 of the cap 4 are in a slanted shape and are in a substantially abutting state in order to suppress deformation of the rear end of the slit 31.

The sliding piece 6 has a protrusion 20 on the outer surface thereof, and a central portion projects from the rear end face of the protrusion 20 and both sides thereof have a cam slope that is substantially the same as the cam slope 14 of the cylindrical cam 5 described above. have. Further, there is provided a hole that abuts on the flange portion 22 of the core pipe 21 and projects and fits behind the core pipe 21 for a long time. The sliding piece 6'has a projection 20 'and a cam slope similar to the sliding piece 6, and an engaging portion 24 for fixing the rear end of the writing body 8 such as a ballpoint pen is provided at the tip. .. The locking portion may be formed in a pipe shape and the rear end of the writing body may be fitted therein.

The mechanical pencil writing body 7 incorporates a general chuck mechanism, is joined to the core pipe 21 via a joint 27 connected to the chuck mechanism at the rear end, and has a flange portion provided at the rear of the core pipe 21. The sliding piece 6 is fitted in contact with the sliding piece 22, and the rear end hole of the core pipe 21 protruding from the rear end of the sliding piece 6 is closed by a tail plug 23 or the like. The lead-out is performed by moving the chuck by the axial transition of the sliding piece 6 with the step portion 26 at the tip of the mechanical pencil writing body 7 abutting on the inner step portion 25 of the tip shaft 3.

[0012] Next, the assembly order will be described. The mechanical pencil writing body 7 and the writing body 8 such as a ballpoint pen are connected to the respective sliding pieces 6 and 6'at their rear ends, and each of the above-mentioned center shaft guide cylinders 2 is connected. The return springs 28, 28 'are movably fitted in the guide grooves 9, 9'and interposed between the front end faces of the sliding pieces 6, 6'and the partition 16 on the front face of the guide grooves 9, 9'. Is urged backwards by. In the cap 4, the cylindrical cam 5 is inserted into the rear end hole of the center shaft 1 and the protrusion 17 is elastically fitted into the circumferential groove 19, so that the cap 4 is rotatable about 180 degrees in the circumferential direction with respect to the center shaft 1 and does not come off. Be fastened. Also, with the mechanical pencil writing body 7 protruding, the cap 4 is capable of changing the stroke by the stroke necessary for the center extension with respect to the center shaft 1, and when the writing body is stored or the writing body 8 such as a ballpoint pen projects. In this state, axis transition is impossible. Since the sliding pieces 6, 6'are always urged rearward by the return springs 28, 28 ', the cam slopes of the protrusions 20, 20' are always in contact with the cam slope 14 of the cylindrical cam 5. I keep it.

Further, when the rear end surface of the front shaft 3 is in contact with the front surface of the step portion 29 of the center shaft 1, the engagement portion 13 of the cylindrical portion 10 is elastically fitted in the engagement groove 12 of the front shaft 3. As a result, the front shaft 3 and the center shaft 1 are fixed in a state where they prevent rotation and do not come off. The front shaft 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 leading shaft 3 or the center shaft 1, the sliding comma 6 advances and the notch 15 at the front end of the cam slope 14 of the cylindrical cam 5 has one mechanical pencil writing body. The writing tip is locked to the projection 20 of the sliding piece 6 of FIG. 7 so that the writing tip projects from the tip end opening. Further, when the cap 4 is rotated to the other side with respect to the leading shaft 3 or the center shaft 1, the sliding piece 6 retracts, the writing tip of the mechanical pencil writing body 7 is retracted from the leading end of the leading spindle, and the sliding piece is moved. 6 ”moves forward, and the writing tip of the writing body 8 such as the other ballpoint pen projects from the tip end opening of the tip shaft.

On the other hand, the eraser holder 39 is fitted from the rear end of the tubular portion 5 of the cap 4, the protrusion 41 and the elastic piece 42 are fitted in the slit 31, and the eraser 52 is fitted to the rear end of the eraser holder 39. Is fixed, and the cap 4 is inserted into the tubular portion 5 ′ from the front end so that the flange portion 32 is elastically deformed and fitted into the concave groove 34 of the cap 4. At this time, the projection 41 is fitted into the spiral groove 33 in a state where the front end of the eraser holder 39 is in contact with the step portion of the front end of the slit 31. (To be precise, the cap 4 is slightly rotated with respect to the tubular portion 5'to allow the projection and the spiral groove to come into contact with each other.) As described above, the tubular portion 5'has the rear end portion 35 in contact with the cap 4. The cap 4 is rotatably attached to the cap 4 in a state of substantially abutting against the cap 36 and is prevented from coming off. Although the cylindrical portion 5'having the slit 31 is delicate and easily deformed, the slanted rear end portion 35 and the abutting portion 36 prevent inward deformation so that the cylindrical portion 5'is stable after mounting. To do.

[0015]

[Action]

 When the button 37 is pressed against the front shaft 3 or the center shaft 1 to rotate the cap 4 to one side, (the pushing portion 38 is engaged with the side surface of the cylindrical portion 5 ′ of the cylindrical cam 5 so that the cylindrical cam 5 and the cap 4 It is integrated in the rotational direction. It is desirable that the engaging surface of the cylindrical portion 5'is provided with an uneven portion for frictional engagement as appropriate.) As shown in FIG. A notch 15 provided at the tip of the engaging member engages with the sliding piece 6 of one of the mechanical pencil writing bodies 7 to project the writing tip portion from the leading end of the leading shaft. At this time, the protrusion 17 of the cylindrical cam 5 is located in the wide groove 47 in the circumferential groove 19 of the center shaft 1. In this state, when the rear end of the cap 4 is knocked and the cylindrical cam 5 is axially moved, the movement is transmitted to the sliding piece 6, the core pipe 21, and the sharp pencil writing body 7, and the step portion 26 at the tip of the writing is transmitted. Is in contact with the inner step portion 25 of the tip shaft 3, the chuck 27 moves axially together with the joint 27, and the lead is fed. When the cap 4 is rotated to the other side with respect to the front shaft 3 or the center shaft 1, the mechanical pencil writing body 7 is retracted, and instead, the writing tip of the writing body 8 such as a ballpoint pen projects from the tip of the leading shaft.

Next, when the cap 4 (the button 37 is not pressed) is rotated with respect to the front shaft 3 or the center shaft 1, the eraser 52 projects from the rear end of the cap 4. Further, at this time, as shown in FIG. 2, the projection 17 appropriately blocks rotation by the projection 51 or 51 ', so that the cylindrical cam 5 is fixed to the center shaft 1 and the cap rotates. The cylindrical cam 5 engages with the sliding pieces 6 and 6'through the return springs 28 and 28 'and has an appropriate rotation resistance. Therefore, the cap is rotated within a range in which the cylindrical cam 5 does not rotate. It is also possible. Therefore, the protrusions 51, 51 'are not an essential requirement for the configuration.

[0017]

[Effect of the device]

 As described above, the present invention uses the resin-molded center shaft that integrates the front shaft and the guide cylinder so that the cylindrical cam can rotate within a certain range to prevent the cam from slipping off, and the center shaft is connected to the front shaft. The engaging part is integrally provided. Further, a flange and a cylindrical portion having a slit are integrally provided behind the cylindrical cam. The eraser holder with the eraser attached to the barrel is freely inserted from the rear end, and the cap is rotatably retained from the rear end to prevent the cap from slipping out of the barrel. Will be replaced by resin, reducing the number of parts. Further, since the assembly is easy, the cost can be reduced and the product can be provided at a low cost. Also, if the cap is rotated with respect to the tip shaft or the center shaft without pressing the button, it is possible to use the writing tool and the eraser method, which are easy to use and convenient.

[Brief description of drawings]

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

FIG. 2 is an enlarged view of a main part showing a fixed state of a cylindrical cam and a center shaft.

[Explanation of symbols]

 1 Middle shaft 2 Guide cylinder 3 Tip shaft 4 Cap 5 Cylindrical cam 6 Sliding piece 6'Sliding piece 7 Mechanical pencil writing material 8 Writing material such as ballpoint pen 9 Guide groove 9'Guide groove 10 Cylindrical part 11 Knock spring 12 Engagement groove 13 Engagement part 14 Cam slope 15 Notch 16 Partition part 17 Protrusion 18 Vertical groove 19 Circumferential groove 20 Protrusion 20 'Protrusion 21 Core pipe 22 Flange part 23 Tail plug 24 Locking part 25 Inner step part 26 Step part 27 Joint 28 Return spring 28  Return spring 29 Stepped portion 30 Hole 30 ″ Hole 31 Slit 32 Collar portion 33 Spiral groove 34 Spiral groove 35 Recessed end portion 36 Abutment portion 37 Button 38 Push portion 39 Eraser holder 40 Cylindrical portion 41 Protrusion 42 Elastic piece 43 Locking protrusion 44 Eraser Appearance Hole 45 Sloping Surface 46 Narrow Part 47 Wide Groove 48 Narrow Groove 49 Front Wall 50 Rear Wall 51 Projection 51 "Projection 52 Eraser

Claims (1)

[Scope of utility model registration request] 1. A plurality of guide grooves of a guide cylinder integrated with the center shaft, each of which is provided with an engaging portion that engages the resin-made front shaft and the front end of the center shaft with each other so as not to rotate and to prevent them from coming off. In addition, a plurality of writing bodies, at least one of which has a sliding piece fixed to the rear end, is a mechanical pencil writing body, and a return spring is urged between the guide cylinder and the sliding piece to move back and forth in the axial direction. A cylindrical cam that is freely fitted and provided with a cam slant surface that is displaced in the axial direction at the front end is fixed to the guide cylinder and the center shaft so that the cylindrical cam can rotate within a certain range and can be moved axially to prevent slippage.
By bringing each sliding piece into contact with the cam slope of the cylindrical cam, each sliding piece is alternately moved in the front-rear direction by the rotation of the cylindrical cam with respect to the front shaft or the center shaft, and the tip of each cursive body comes out from the tip of the front shaft. It is possible to appear and disappear selectively, and when the mechanical pencil is selected, it is possible to extend the core by shifting the axis of the cylindrical cam, and at the rear of the cylindrical cam, a cylindrical part extending with a brim and a slit is provided. It has a button that shifts inward by pressing on the side surface, and inserts the tubular part of the cylindrical cam into a cap that has a spiral groove in the inner hole, an eraser retracting hole at the rear end of the spiral groove, and a concave groove at the front end. The part is fitted in the groove, the cylindrical cam is rotatably locked against the cap, and the eraser holder with the eraser attached to the rear is fitted in the slit and spiral groove in the cylinder. To the front and center shafts. When the cap is rotated, the eraser holder moves back and forth so that the eraser can be retracted from the rear end of the cap, and when the cap is rotated while the above button is pressed, the pushing part inside the button engages with the tubular part. The writing instrument is characterized in that the cylindrical cam and the cap are integrated in the rotating direction so that the tip of each writing body can be projected and retracted.