JPH0535380U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] Rotate the cap relative to the tip shaft to reduce
When two cursive pencils are selected and used as a mechanical pencil, the cap is allowed to move relative to the tip shaft when the mechanical pencil is projected, and the axial movement is not possible when the ballpoint pen is projected or the cursive is stored. It is possible to provide a compound writing instrument designed as described above at low cost and with ease of use. [Structure] The main part is a resin molded product, the front shaft 2 is fixed to the front half of the guide cylinder 1, and the cap 4 provided with a cam slope 20 on the rear half of the guide cylinder is fixed so as to be axially movable and rotatable. . Further, two writing bodies having sliding pieces 5 and 5'fixed at the rear ends are fitted into the guide grooves 8 and 8'of the guide cylinder, and the projection of the sliding piece and the cam slope 20 are brought into contact with each other. Then, when the cap is rotated with respect to the leading shaft, the writing parts 4 of the respective cursive bodies are
5, 45 "can be alternately projected and retracted from the tip end port 46 of the tip shaft, and when the mechanical pencil writing body 6 is projected, the flange part 47 of the guide cylinder fixed to the front end edge of the cap and the tip shaft.
A gap 25 corresponding to the knock stroke is formed between the two to allow the lead to be extended.

Description

[Detailed description of the device]

[0001]

[Industrial use field]

 The present invention relates to a compound writing instrument in which at least two writing elements, each of which has a mechanical pencil, can be selectively retracted at a shaft tip opening.

[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, a joining cylinder is interposed to fix the guide cylinder to the tip shaft, and a screw tube or a decorative ring is interposed to make the cap rotatable with respect to the tip shaft. The first problem is that metal parts are used for the parts, the structure is complicated, the number of parts is large, and the cost is high. In addition, in this type of writing instrument, the knock part for extending the lead of the mechanical pencil is projected at the rear end of the shaft, and if impact pressure due to falling etc. is applied to this knock part, the internal mechanism such as the rotating mechanism is damaged. There is a second problem. An object of the present invention is to provide a multiple writing instrument that solves such problems.

[0004]

[Means for Solving the Problems]

 The multiple writing instrument of the present invention devised to solve the above-mentioned problem is provided with a guide cylinder having a pair of guide grooves inside the tip shaft, and at least one of them is a mechanical pencil. Sliding tops are attached to the ends, and these writing bodies are fitted in the guide grooves of the guide cylinder so as to be movable in the axial direction, respectively, and the cam slant surface which is displaced axially in the cap inner hole is circumferentially formed in the front end portion. In addition to providing the cap, the cap can be rotated and axially moved with respect to the guide cylinder so that the cap can be rotated in the circumferential direction with respect to the tip shaft, the cam slope is brought into contact with the sliding piece of each writing body, and the cap inner hole is formed. By inserting the flange part provided on the guide tube into the circumferential groove provided on the guide tube and rotating the cap with respect to the tip shaft, the mechanical pencil writing instrument and other writing instruments can be selectively retracted at the tip end of the shaft. In the writing instrument It is constituted as characterized by features integrally with the engaging portion of the front barrel to the guide tube and the Id cylinder and front barrel and the cap and the resin molded article. In addition, in order to solve the second problem, it is further necessary that the writing portion of the mechanical pencil writing body is located at the rear wall of one end of the circumferential groove where the brim portion is located when the writing portion projects from the tip of the shaft. Set the position of the rear wall at the other end of the circumferential groove where the brim is located when the writing part of the body protrudes from the shaft tip opening, and set the position of the rear wall to the required distance forward, and the writing part of the mechanical pencil writing body projects from the shaft tip opening. In this state, the gap between the front edge of the cap and the rear edge of the flange of the guide tube fixed to the front shaft is set to be approximately the same as the axial displacement of the rear wall at both ends of the circumferential groove. It constitutes a writing instrument.

[0005]

【Example】

 Embodiments will be described below with reference to the drawings. The compound writing instrument of the present invention comprises a guide cylinder 1, a tip shaft 2, a cap 4 having a cam slope on the inner hole, a pair of sliding pieces 5, 5 ', a sharp pencil writing body 6, and another ballpoint writing body 7. Is the main component. As shown in FIGS. 3 and 4, the guide cylinder 1 has a pair of axially long guide grooves 8 and 8'opened on both side surfaces on substantially opposite sides from a substantially central portion to a position slightly forward of a rear end. The front half has a cylindrical portion 9 whose rear end communicates with the guide grooves 8 and 8'and the front end has an open cylindrical portion 9. The rear end has a circumferential circumferential groove 10 on its side surface. An exposed surface portion 11 is provided on the outer surface of the rear end portion of the tubular portion 9 in a substantially central portion, and a flange portion, which is a ridge in a circumferential direction, is provided on the rear side of the exposed surface portion 11 and on the front side surface of the guide grooves 8 and 8 ′. 47, and on the side surface of the substantially central portion of the cylindrical portion 9 in front of the exposed surface portion 11, there is an engaging portion 15 composed of a wedge-shaped axial rib 13 having a front end and a groove 14 dividing the rib 13. The whole is integrally molded with resin, and the engaging portion 15 is elastically deformable.

Next, as shown in FIG. 6, the front shaft 2 has a cylindrical shape with a tapered front end and an opening at the front and rear ends, and a tapered portion 16 is provided on the inner edge of the rear end near the inlet of the rear end. It has an engaging portion 19 consisting of an axial groove 17 provided and a rib 18 provided so as to divide an intermediate portion of the groove 17, and the entire portion is integrally molded with resin, and the engaging portion 19 is elastically deformed. It is possible.

The above-mentioned guide cylinder 1 is inserted into the inside of the front end of the front shaft 2 from the rear end opening thereof, and the engagement part 15 thereof is locked and fixed to the engagement part 19 of the front shaft 2. That is, the ribs 13 of the guide cylinder 1 are fitted into the grooves 17 of the front shaft 2 to prevent rotation in the circumferential direction, and the ribs 18 of the front shaft 2 and the grooves 14 of the guide cylinder 1 are elastically deformed. It engages and is prevented from coming off. When the rib 13 of the guide cylinder 1 is fitted in the groove 17 of the front shaft 2, even if there is some deviation in the circumferential direction, the tapered portion 16 at the inlet edge of the groove 17 and the wedge-shaped tip shape of the rib 13 make it possible. As a result, the ribs 13 are guided, so that the ribs 13 are securely fitted.

As shown in FIGS. 7 to 8, the cap 4 has a cam slope 20 that is circumferentially displaced forward and backward at the front edge of the inner hole, and has a notch 21 at the forefront end of the cam slope 20. However, it has a four-quarter-circumferential brim portion 24 at the rear. A shaft portion 26 having a hole 22 is provided at the rear end. Further, a clip mounting portion 27 is provided on one side surface of the rear end, and the whole body is integrally molded with resin, and the clip 33 is elastically fixed to the clip mounting portion 27.

Further, the cap 4 is elastically fitted to the circumferential groove 10 at the rear end of the guide cylinder 1 so that the flange portion 24 of the inner hole is elastically fitted to the guide cylinder 1 so as to be rotatable and axially movable. And is prevented from being pulled out. An eraser stopper 29 holding an eraser 28 is fitted in the hole 22 at the rear end, and a knock cover 31 is fitted on the outer periphery of the shaft portion 26.

As shown in FIGS. 9 and 10, the sliding pieces 5, 5 ′ have a protrusion 34 on the outer surface thereof, and a central portion projects from the rear end face of the protrusion 34, and both sides thereof have the cap 4 described above. A cam slope 35 having substantially the same slope as the cam slope 20 of the inner hole is provided, and a locking hole 36 is provided inside. The mechanical pencil writing body 6 (see FIG. 1) incorporates a general chuck mechanism (not shown), and a core pipe 38 is joined to a rear end of the core pipe 38 via a joint 37 connected to the chuck mechanism. The rear end is fitted in the locking hole 36 of the sliding piece 5, and the lead is extended by the axial transition of the lead pipe 38. The writing body 7 such as another ballpoint pen has a receiving rod 39 joined to its rear end as shown in FIGS. 11 and 12, and the rear end of the receiving rod 39 is fitted to the sliding piece 5 ′. The mechanical pencil writing body 6 and the writing body 7 such as a ball pen have their respective sliding pieces 5 and 5'movably fitted into the guide grooves 8 and 8'of the guide tube 1 described above, and the sliding pieces 5 and 5 ', respectively. It is urged rearward by return springs 40, 40 'interposed between the front end face of 5'and the guide grooves 8, 8'of the guide cylinder 1.

The front end portion of the cap 4 is arranged so as to cover the outer peripheral portion of the rear end of the guide cylinder 1, and the sliding pieces 5, 5'of each writing body are urged backward by the return springs 40, 40 '. Therefore, the cam slope 35 of the projection 34 is always kept in contact with the cam slope 20 of the inner hole of the cap 4. Further, the flange portion 24 of the inner hole of the cap 4 is fitted into the circumferential groove 10 of the guide cylinder 1. The circumferential groove 10 is provided over a range of approximately 180 ° in the circumferential direction. As shown in FIG. 5, the rear wall 41 at one end of the circumferential groove 10 is located a required distance behind the rear wall 41 ′ at the other end and is located at the rear of both ends. The walls 41 and 41 'are connected by an inclined surface 42, and the distance between the rear wall 41 and the front wall 43 at the rear is set to be slightly longer than that of the Knox trooke for feeding the lead of the mechanical pencil writing body 6. Further, the axial distance between the rear walls 41, 41 'on both ends is the gap between the front end edge of the cap 4 and the rear end edge of the flange portion 47 of the guide cylinder 1 fixed to the front shaft 2. 25 and knock stroke are set to be almost the same.

The brim portion 24 is a circumferential groove when the notch 21 at the foremost end of the cam slope 20 is engaged with the rear end protrusion 44 on the cam slope 35 of the projection 34 of the sliding piece 5 of the mechanical pencil writing body 6. It is located corresponding to the rear wall 41 at the rear of one end of 10, and also the front end notch 21 of the cam slope 20 and the rear end protrusion of the cam slope 35 of the sliding piece 5'of the writing body 7 such as a ballpoint pen 44 When and are engaged, they are adjusted so as to be positioned corresponding to the front rear wall 41 ′ at the other end of the circumferential groove 10. Further, the mechanical pencil writing body 6 and the writing body 7 such as other ballpoint pens have their front end writing portions 45 and 45 'in front with their sliding parts 5 and 5'engaged with the tip notches 21 of the cam slope 20. The length is appropriately set so as to project from the tip opening 46.

[0013]

[Action]

 FIG. 1 shows a state in which a tip notch 21 of a cam slope 20 of a cylindrical cam 3 is engaged with a sliding piece 5 of one mechanical pencil writing body 6 and a writing portion 45 thereof is projected from a tip end opening 46 of a tip shaft. At this time, the brim portion 24 of the cap inner hole is present at the position of the wide portion a of the circumferential groove 10 in FIG. In this state, if the knock cover 31 fixed to the rear end of the cap 4 is knocked, the knocking force is transmitted to the core pipe 38 through the tip notch 21 of the cam slope 20 and the sliding piece 5, and the core pipe 38 With the 38 axis transition, the core is extended 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 4 to prevent damage to the internal rotation mechanism and the like.

Next, the cap 4 is rotated with respect to the front shaft 2 to release the engagement between the notch 21 of the cam slope 20 and the sliding piece 5 of the mechanical pencil writing body 6, and when the rotation is further continued, the cam slope 20 causes the cam to rotate. The sliding piece 5 of the mechanical pencil writing body 6 retreats, and conversely, the sliding piece 5 ′ of the writing body 7 such as another ball pen moves forward, and the brim portion 24 is located at the position of the peripheral groove 10 in FIG. When the writing portion 45 of the mechanical pencil writing body 6 is immersed in the tip shaft 2 and further rotated, the mechanical pencil writing body 6 and the writing body 7 such as another ballpoint pen are replaced with each other, and the cam is rotated approximately 180 °. The notch 21 at the tip end of the inclined surface 20 and the sliding piece 5'of the writing body 7 such as a ball pen engage with each other to cause the writing portion 45 'to project, and the brim portion 24 causes the groove 24 of the circumferential groove 10 in FIG. Reach the position of. At this time, the brim portion 24 advances by the axial distance of the inclined surface 42 of the circumferential groove 10, so that the front end edge of the cap 4 is substantially in contact with the rear end edge of the flange portion 47 of the guide cylinder 1.

[0015]

[Effect of the device]

 As described above, according to the present invention, since the front shaft, the guide cylinder, and the cap are resin-molded products and the guide cylinder and the engaging portion for the front shaft and the cap are integrally provided, the joining cylinder and the screw as in the conventional example. The need for pipes, decorative rings, etc. is eliminated, and the number of parts is reduced, facilitating assembly, resulting in cost reduction and providing an inexpensive product. Further, as in the embodiment, the rear walls at both ends of the circumferential groove of the guide cylinder are displaced in the axial direction, and a gap corresponding to the knock stroke is displaceable between the front end edge of the cap and the flange portion of the guide cylinder. As a result, the cap moves axially only when the mechanical pencil is in use, so 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. Therefore, it is effective in preventing damage to the internal rotating mechanism.

[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 an overall vertical sectional view showing an embodiment of the present invention, showing a usage state of a ballpoint pen or the like.

FIG. 3 is a vertical sectional view of a guide cylinder used in the present invention.

FIG. 4 is a plan view of a guide cylinder.

FIG. 5 is a developed plan view showing the positional relationship of the brim portion of the cap in the circumferential groove of the guide cylinder.

FIG. 6 is a vertical cross-sectional view of a tip shaft used in the present invention.

FIG. 7 is a vertical sectional view of a cap used in the present invention.

FIG. 8 is a rear end view of the cap.

FIG. 9 is a vertical cross-sectional view of a sliding piece used in the present invention.

FIG. 10 is a side view of a sliding piece.

FIG. 11 is a vertical sectional view of a receiving rod used in the present invention.

FIG. 12 is a plan view of a receiving rod.

[Explanation of symbols]

 1 guide cylinder 2 tip shaft 3 hole 3'hole 4 cap 5 sliding piece 5'sliding piece 6 mechanical pencil writing material 7 writing material such as ballpoint pen 8 guide groove 8'guide groove 9 tube portion 10 circumferential groove 11 exposed surface portion 12 wide Part 13 Rib 14 Groove 15 Engagement part 16 Tapered part 17 Groove 18 Rib 19 Engagement part 20 Cam slope 21 Notch 22 Hole 23 Partition part 24 Collar part 25 Gap 26 Shaft part 27 Clip mounting part 28 Eraser 29 Eraser stopper 30 steps Part 31 Knock cover 32 Tail plug 33 Clip 34 Protrusion 35 Cam slope 36 Locking hole 37 Joint 38 Core pipe 39 Receiving rod 40 Return spring 40 'Return spring 41 Rear wall 41' Rear wall 42 Inclined surface 43 Front groove wall 44 Rear end protrusion of cam slope of sliding piece 45 Writing part 45 'Writing part 46 Tip shaft tip end port 47 Nji section 48 chuck spring

Claims (1)

[Scope of utility model registration request] 1. A guide cylinder having a pair of guide grooves is provided inside the front shaft, and at least one guide cylinder is used as a mechanical pencil.
Sliding pieces are attached to the rear ends of the writing bodies of the book, and these writing bodies are fitted in the guide grooves of the guide cylinder so as to be movable in the axial direction, respectively, and the cam slant surface which is displaced in the axial direction is set in the inner hole of the cap. The cap is rotatably and movably fixed to the guide cylinder, and the cap is rotatable in the circumferential direction with respect to the tip shaft, and the cam slope is used as the sliding piece of each cursive body. While making contact, fit the brim part provided in the cap into the circumferential groove provided at the rear end of the guide cylinder, and rotate the cap with respect to the tip shaft to select the mechanical pencil writing body and other writing bodies at the tip of the shaft. In a multiple writing instrument that can be freely retracted and retracted, the guide tube, the tip shaft, and the cap are made of resin molding, and the guide tube has an engaging part for the tip shaft that is integrated with the writing part of the mechanical pencil writing element. Keep it protruding from the tip mouth With respect to the rear wall of one end of the circumferential groove in which the brim portion is located, the position of the rear wall of the other end of the circumferential groove in which the brim portion is located in the state in which the writing portion of the other writing body projects from the shaft tip opening is the required distance forward And the gap between the front end edge of the cap and the rear end edge of the flange part of the guide tube that is fixed to the front shaft when the writing part of the mechanical pencil writing body projects from the tip of the shaft. A double-sided writing instrument characterized in that the amount of displacement in the axial direction of the wall is set to be approximately the same.