JPH0586585U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] Rotate the cap around the tip shaft to select the mechanical pencil and ball-point pen to make them appear and disappear, and only when the mechanical pencil is projected, the cap can move axially relative to the tip shaft, so that the While preventing the mechanical part from being damaged by impact,
Along with the removal of the knocked portion, the shaft diameter and the tip of the front shaft are made thin, which enables the appearance of high-quality products. [Structure] A front shaft 40 is fixed to the front half of the guide cylinder 1, and a cylindrical cam 17 provided with a cam slope 18 is fixed to the rear half of the guide cylinder so as to be rotatable and axially shiftable, and the cylindrical cam is capped to a cap 33. Is integrally fixed to the guide groove of the guide tube 2a, 2
The two writing bodies in which the sliding pieces 8 and 8'are jointed in a flexible state are fitted to b, and the rear end of the protrusion of the sliding piece and the cam slope 18 are brought into contact with each other, and On the other hand, when the cap is rotated, the writing parts 28 and 30 of the respective writing bodies can be alternately projected and retracted from the tip end opening 41 of the tip shaft, and only when the mechanical pencil writing body 27 is projected, it is integrally joined with the guide tube. A gap S for the knock stroke is formed between the stopper ring 23 provided on the cylinder 21 and the front end edge of the cap, and the lead can be fed out.

Description

[Detailed description of the device]

[0001]

[Industrial use field]

 The present invention relates to a compound writing instrument in which the writing parts of two writing bodies, a mechanical pencil and a ballpoint pen, can be selectively retracted at the tip of the shaft.

[0002]

[Prior Art]

 Conventionally, as an example of this type of double-sided writing instrument, as shown in Japanese Utility Model Laid-Open No. 57-39787, a guide tube fixed to a leading shaft has a sliding groove for guiding two writing instruments. And a cam slope contacting the sliding pieces attached to the two cursive bodies fitted to the guide cylinder is provided at the front end and the rear end serves as a knocking portion so that it can move axially with respect to the cap. There is a compound writing instrument that has a cylindrical cam that is mounted so that it can rotate in the circumferential direction, and that allows two writing instruments to be selectively retracted at the tip of the shaft by rotating the cap with respect to the tip shaft. ..

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional example, the knock portion for feeding the lead of the mechanical pencil is projected at the rear end of the shaft, and the internal mechanism such as the rotating mechanism is damaged when the impact pressure due to dropping etc. is applied to this knock portion. There is an easy first problem. Further, there is a second problem that the appearance is bad due to the presence of the knock portion. In addition, this type of writing instrument tends to have a thicker shaft diameter, but in the appearance of high-grade products, there is a demand to make it as thin as possible.

[0004]

[Means for Solving the Problems]

 The compound writing instrument of the present invention devised to solve the above-mentioned problem is a ballpoint pen against the rear wall of the circumferential groove where the brim is located when the writing portion of the mechanical pencil projects from the shaft tip opening. When the writing part of the is protruding from the shaft tip opening, set the position of the rear wall at the other end of the circumferential groove where the brim is located to the front of the required distance, and join it so that the front shaft is fixed to the front of the guide tube. Secure the stopper ring to the cylinder and set the gap between the front edge of the cap and the rear edge of the stopper ring when the writing portion of the mechanical pencil projects from the tip of the shaft into the gap between the rear walls at both ends of the circumferential groove. The amount of displacement in the axial direction was set to be approximately the same, and the lead of the mechanical pencil could be extended. When the cursive body is stored and when the ballpoint pen is projected, the gap is almost zero and the appearance is good. Therefore, there is no need for a knocking portion, and there is no need for a structure for shifting the shaft while the cap is fitted on the front shaft. Also, by making the rotating mechanism part a die cast product, each of the mechanical parts can be designed to be thin, and by making the slope of the cam of the cylindrical cam steep appropriately, the stroke for witnessing the cursive body can be increased. Set and slide the writing body by flexibly connecting the tip of the sliding piece to the rear end of the core pipe that connects the writing system with the mechanical pencil and the rear end of the holding tube that connects the writing system such as a ballpoint pen. Is smooth, and it is possible to make the shaft tip and shaft diameter as thin as possible to improve the appearance.

[0005]

【Example】

 Embodiments will be described below with reference to the drawings. First, as shown in FIG. 1, the compound writing instrument of the present invention includes a guide cylinder 1, a tip shaft 40, a cylindrical cam 17, a cap 33, a pair of sliding pieces 8, 8 ', a mechanical pencil writing body 27, a ballpoint pen, etc. The body 29 is the main constituent element. As shown in FIG. 2, the guide cylinder 1 is a die cast product, and has a pair of axially long guide grooves 2a and 2b that are open on both side surfaces on the substantially opposite side from the front side to the rear end position. It is formed so as to be elastically displaceable in a direction substantially perpendicular to the guide groove, and has a rear end communicating with each guide groove 2a, 2b in the front, an open shaft portion 2 in the front end, and a circumferential surface on the side surface of the rear end. There is a circumferential groove 4 in the direction, and the circumferential groove 4 is formed by connecting a wide groove 5 and a narrow groove 6 with an inclined surface 7.

Next, as shown in FIG. 1, the front shaft 40 is a cylindrical metal body that is integrally formed or has a front end tapered with an end or the like connected to it and a front end and a rear end opened. On the shaft portion 2 of the guide cylinder 1 described above, a joining cylinder 21 having an engaging portion 22 that bulges like a rib on the front outer periphery is fixed, and further on the outer periphery of the joining cylinder 21 behind the engaging portion 22. The stopper ring 23 is fixed. In the guide cylinder 1, the joining cylinder 21 is inserted into the inside thereof from the rear end opening of the front shaft 40, and the engagement portion 22 is formed first with the front end edge of the stopper ring 23 in contact with the rear end edge of the front shaft 40. It is detachably fixed to the inner surface of the shaft 40.

As shown in FIG. 3, the cylindrical cam 17 has a cam slant surface 18 that is circumferentially displaced forward and backward at the front end edge of the inner hole, and has a notch 19 a at the frontmost end of the cam slant surface 18. The rear part has a collar 19 having a quarter-circumferential shape. A shaft portion 20a having a hole 20 is provided at the rear end. Further, the flange 19 of the cylindrical cam 17 is fitted into the circumferential groove 4 at the rear end of the guide cylinder 1 by elastically displacing the guide cylinder 1, and is fitted to the guide cylinder 1 by rotation and axial transition. It will be retained.

The cap 33 is a tubular metal body, a clip is fixed to one side on the rear side of the outer periphery, an eraser holder 34 is fixed to the rear end hole, and a rear end hole is attached to the eraser holder 34. An eraser 37 held by an eraser stopper 36 is fitted and a cover 35 is detachably attached to the outer periphery of the eraser holder 34. The cylindrical cam 17 is positioned in the inner hole of the cap 33 and fixed integrally.

As shown in FIGS. 4 and 7, the sliding pieces 8 and 8 ′ have protrusions on their outer surfaces, and the rear end face of the protrusions has a central portion protruding from which protrusions 12 and 12 ′ are formed on both sides. Cam slopes 11 and 11 'having substantially the same slope as the cam slope 18 of the cylindrical cam 17 described above are provided, and shafts 9 and 9'having screw parts 10 and 10' are provided behind the protrusions. Has been. The sharp pencil writing system 27 has a built-in general chuck mechanism (not shown), and the core pipe 24 is joined to the rear end of the sharp pipe through the shaft joint 32 connected to the chuck mechanism. The shaft portion 15 of the joint 14 is fixedly mounted on the sliding member 8 and the round shaft-shaped support portion 16 at the rear end is fitted into the round hole-shaped groove 13 formed on the side surface of the sliding comma 8 so that the sliding member 8 And the joint 14 are flexibly jointed. Further, the writing body 29 such as a ball-point pen has a holding tube 25 joined to its rear end, and a shaft portion 15a of a joint 14 'having a circular hole-shaped groove 13' is fixedly attached to the rear end of the holding tube 25. The portion 15b comes into contact with the rear end of the holding tube 25. At that time, a round shaft-shaped support portion 16 ′ protruding in front of the sliding piece 8 ′ is fitted into the groove 13 ′ in advance, and the sliding piece 8 ′ and the joint 14 ′ are flexibly joined.

In addition, the mechanical pencil writing body 27 and the writing body 29 such as a ballpoint pen are slidably fitted into the respective guide grooves 2a and 2b of the above-mentioned guide cylinder 1 so that the sliding commas 8 and 8'are respectively fitted. Pulling ties 38, 38 'are laid between the shafts 9, 9'of the sliding pieces 8, 8'and the end 3 of the rear end of the guide cylinder 1 to constantly urge them rearward. The ends of the tension springs 38, 38 'are fixed to the sliding pieces 8, 8'with shaft portions 9, 9' properly formed with grooves or screw portions 10, 10 'with a coil portion wound around. Further, the rear ends of the tension springs 38, 38 'are formed as end-winding portions 39, 39' having a slightly larger diameter, and are installed and fixed to the end portion 3 of the guide cylinder 1.

Further, the front half of the cylindrical cam 17 is arranged so as to cover the outer peripheral portion of the rear end of the guide cylinder 1, and the sliding pieces 8, 8 ′ of each writing body are urged rearward by the tension springs 38, 38 ′. Therefore, the cam slopes 11 and 11 ′ of the protrusion are always kept in contact with the cam slope 18 of the cylindrical cam 17. Further, the flange 19 of the cylindrical cam 17 is fitted into the circumferential groove 4 of the guide cylinder 1. The circumferential groove 4 is provided over a range of about 180 ° in the circumferential direction, and as shown in FIG. 2, the rear wall 5 ′ of one end thereof is located a predetermined distance behind the rear wall 6 ′ of the other end and is located at the rear end of both ends. The walls 5 and 6 are connected by a slope 7, and the distance between the rear wall 5 and the front wall 7 is set to be slightly longer than the knock stroke for feeding the center of the sharp pencil cursive body 27. The axial distance between the rear walls 5'and 6'on both ends is determined by the clearance S and the knock between the front end edge of the cap 33 and the rear end edge of the stopper ring 23 of the joining cylinder 21 fixed to the front shaft 40. It is set to be almost the same as the stroke.

The collar 19 of the cylindrical cam 17 has one of the circumferential grooves 4 when the notch 19 a at the frontmost end of the cam slope 18 is engaged with the rear end projection 12 of the sliding piece 8 of the mechanical pencil writing body 27. It is located corresponding to the rear wall 5'of the end, and when the notch 19a of the cam slope 18 and the sliding piece 8 "of the writing body 29 such as a ballpoint pen engages with the rear end projection 12" of the circumferential groove 4, It is adjusted so that it is located corresponding to the rear wall 6'at the other end. Further, the mechanical pencil writing body 27 and the writing body 29 such as a ball-point pen have front end writing portions 28 and 30 in front of the front end writing portions 28 and 30 in a state in which the respective sliding pieces 8 and 8'engage with the notches 19a at the frontmost end of the cam slope 18. The length is appropriately set so as to project from the end opening 41.

[0013]

[Action]

 FIG. 1 shows a state in which the notch 19a at the foremost end of the cam slope 18 of the cylindrical cam 17 is engaged with the sliding piece 8 of one of the sharp pencil writing bodies 27 so that the writing portion 28 thereof is projected from the tip end opening 41 of the tip shaft. The flange 19 of the inner hole of the cylindrical cam 17 is present at the position of the wide groove 5 of the circumferential groove 4 of the guide cylinder 1 shown in FIG. In this state, if the cover 35 fixed to the rear end of the cap 33 is knocked, the knocking force is transmitted to the core pipe 24 through the notch 19a of the cam slope 18 and the sliding piece 8 and the core pipe 24 The core is extended by the axis transition, and writing becomes possible. When the writing instrument is dropped in this state and an impact is applied to the rear end of the writing instrument, the impact is absorbed by the cap 33 to prevent damage to the internal rotation mechanism and the like.

Next, the cap 33 is rotated with respect to the front shaft 40 to release the engagement between the notch 19a at the front end of the cam slope 18 and the sliding piece 8 of the mechanical pencil writing body 27, and the rotation is further continued. By the cam slope 18, the sliding piece 8 of the mechanical pencil writing body 27 retreats, and conversely, the sliding piece 8 ′ of the writing body 29 such as a ballpoint pen moves forward, and the brim 19 passes through the slope 7 of the circumferential groove 4 to move the width. When the writing portion 28 of the mechanical pencil writing body 27 is immersed in the tip shaft 40 when it comes to a position where it is suspended in the narrow groove 6, when it is further rotated, the mechanical pencil writing body 27 and the writing body 29 such as a ballpoint pen are replaced with each other. In the state of being rotated 180 °, the notch 19a of the cam slope 18 and the sliding piece 8 ′ of the writing body 29 such as a ballpoint pen are engaged with each other to cause the writing portion 30 to project, and the brim 19 is provided with the narrow groove 6 of the circumferential groove 4. Deeply into . At this time, the brim 19 advances by the axial distance of the inclined surface 7 of the circumferential groove 4, so that the front end edge of the cap 33 is substantially in contact with the rear end edge of the stopper ring 23. (Not shown) Even when the cursive body is in the retracted state, the brim 19 is suspended in the narrow groove 6 and is thus in a substantially contact state.

[0015]

[Effect of the device]

 As described above, according to the present invention, the rear walls at both ends of the circumferential groove of the guide cylinder are axially displaced, and at the same time, a knock stroke gap is provided between the front end edge of the cap and the stopper ring. Since the cap moves axially only when using a mechanical pencil, it will not be knocked while being carried, and if a shock is applied to the rear end such as a drop, the shock pressure is absorbed by the cap. This has the effect of preventing damage to the rotating mechanism. In addition, since there is no knocking part at the rear end of the shaft that moves axially, it is possible to make it look like a high-quality product, and make the rotating mechanism part a die-cast molded product that can be thinned, and the core pipe and holding pipe and sliding piece. By flexibly joining and, the writing body slides smoothly as the writing part appears in and out of the tip shaft tip opening, and the appearance can be improved such that the shaft diameter and tip shaft tip can be made thinner.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention, showing a usage state of a mechanical pencil.

FIG. 2 is a half sectional view of a guide cylinder used in the present invention.

FIG. 3 is a sectional view of a cylindrical cam used in the present invention.

FIG. 4 is a partial cross-sectional front view showing a state of a sliding piece on the mechanical pencil side and a joint of a core pipe used in the present invention.

5 is a front view of the joint shown in FIG. 4. FIG.

6 is a front view of a sliding piece in FIG.

FIG. 7 is a front view of a partial cross section showing a state of a joint between a sliding piece on the ballpoint pen side and a holding tube used in the present invention.

FIG. 8 is a front view of the joint in FIG.

FIG. 9 is a top view of the sliding piece in FIG.

FIG. 10 is a front view of a sliding piece in FIG.

[Explanation of symbols]

 1 Guide cylinder 2 Shaft part 2a Guide groove 2b Guide groove 3 End part 4 Circumferential groove 5 Wide groove 5'Rear wall 6 Narrow groove 6'Rear wall 7 Slope 7'Front wall 8 Sliding piece 8'Sliding piece 9 Shaft part 9 "Shaft part 10 Screw part 10" Screw part 11 Cam slope 11 "Cam slope 12 Protrusion 12" Protrusion 13 Groove 13 "Groove 14 Joint 14" Joint 15 Shaft 15a Shaft 15b Flange 16 Support ｀ Support part 17 Cylindrical cam 18 Cam slope 19 Collar 19a Notch 20 Hole 20a Shaft part 20b Rear end part 21 Joining cylinder 22 Engagement part 23 Stopper ring 24 Core pipe 25 Retaining pipe 26 Stopper 27 Mechanical pencil 28 Writing part 29 Ballpoint pen Etc. Writing body 30 Writing part 31 Knock spring 32 Shaft coupling 33 Cap 34 Eraser holder 35 Cover 36 Eraser stopper 37 Eraser Rubber 38 Tension spring 38 'Tension spring 39 End turn part 39' End turn part 40 Tip shaft 41 Tip shaft tip port

Claims (1)

[Scope of utility model registration request] 1. A guide tube having a pair of guide grooves is disposed in a cap, and a sliding piece is attached to each of a rear end of a core pipe and a holding pipe for joining two writing bodies of a mechanical pencil and a ballpoint pen, These cursive bodies are fitted in the guide grooves of the guide cylinder so as to be movable in the axial direction, respectively, and a cylindrical cam having a cam slant surface that is displaced in the axial direction is fixed to the cap, and rotation and axial transition are possible with respect to the guide cylinder. To the sliding shaft of each cursive body and fit the flange provided on the cylindrical cam into the circumferential groove provided at the rear end of the guide cylinder, and attach it to the tip shaft fixed to the guide cylinder front end. In a compound writing instrument in which the writing body can be selectively retracted from the tip of the shaft by rotating the cap, the guide cylinder, cylindrical cam, and sliding piece are die-cast molded products. A tension spring between the end In addition to energizing, the tip of the sliding piece is jointed to the rear end of the core pipe and the holding tube in a flexible state, and the stopper ring is fixed to the joining tube provided to fix the tip shaft to the tip of the guide tube. Contact the rear end edge of the tip shaft, and the writing part of the ballpoint pen from the shaft tip opening to the rear wall of the circumferential groove where the brim is located when the writing part of the mechanical pencil projects from the shaft tip opening. The rear wall of the circumferential groove where the brim is located in the protruding state is set to the front of the required distance, and when the writing portion of the mechanical pencil is protruding from the shaft end opening, the front edge of the cap and the stopper ring are set. A double-sided writing instrument characterized in that the gap between the rear end edge and the rear end edge is set to be substantially the same as the axial displacement of the rear wall at both ends of the circumferential groove.