JP2566103Y2 - Double writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to 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]

2. Description of the Related Art Conventionally, as an example of a double-type writing instrument, as shown in Japanese Utility Model Laid-Open No. 64-3491 by the same applicant, a sliding groove for guiding two writing bodies is provided on a front shaft. The front end has a guide tube fixed to the guide tube and a cam slope contacting a sliding piece attached to two writing bodies fitted to the guide tube, and the rear end forms a knock portion to the cap. Equipped with a cylindrical cam mounted so as to be movable in the axial direction and integrated in the circumferential direction, and by selectively rotating the cap with respect to the front shaft, two writing bodies can be selectively placed at the front end of the front shaft. There are multiple writing instruments that can appear and disappear.
In addition, as a cited example of the present application, Japanese Utility Model Application No.
As described in JP-A-120889, there is a double-type writing instrument in which a crown protruding from a rear end of a cap is rotated to make an eraser appear and disappear.

[0003]

The above cited reference has a first problem in that metal parts are used in many parts, the structure is complicated, the number of parts is increased, and the cost is increased. or,
Since the crown that protrudes from the rear end of the cap is short, there is a second problem in that it is difficult to pick with a finger, and it is difficult to operate the eraser in and out.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a double writing instrument according to the present invention has a front end made of a resin and a front end made of a middle shaft made of a resin fitted to each other so as to be non-rotatable and non-removable. An engaging portion to be attached is provided, and both are fixed. A plurality of writing bodies having at least one mechanical pencil with a sliding piece fixed to the plurality of guide grooves provided in the guide portion of the center shaft at the rear end are fitted in a freely movable manner through a return spring. , and fitted with a cap made of resin having a slit in a cylindrical portion which is integrally extended and its rear cylindrical cam provided circumferentially on a front end portion of the cam slope displaced in the axial direction guide portion and the center pole The cap has been turned so as to be able to rotate with respect to the central shaft and to be able to move in the axial direction while preventing the cap from coming off. Also cap
A projection and a groove are provided alternately on both sides of the slit of the above-mentioned cylinder part, and an eraser holder with an eraser fixed to the back is attached by detachably engaging the projection provided on the outer periphery with the slit groove. It was done. As described above, by bringing each sliding piece into contact with the cam slope of the cylindrical cam, the sliding piece is alternately moved in the front-rear direction by rotation of the cap with respect to the front shaft or the central shaft, and the tip of each writing body is moved to the front shaft. It is made to be able to selectively emerge from the tip opening, and when selecting a mechanical pencil, knock the rear end of the cap and pull out the core,
The eraser is made to protrude and retract from the rear end of the cap by moving the protrusion provided on the outer periphery of the eraser holder back and forth with respect to the cap.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The dual writing instrument of the present invention includes a center shaft 1 integrally provided with a guide portion 2, a leading shaft 3, a cap 31 integrally provided with a cylindrical cam 4, a pair of sliding pieces 5, 5 ｀, a mechanical pencil writing body 6, a ballpoint pen, and the like. The cursive body 7, the eraser holder 36, and the eraser 41 are main components. First, the center shaft 1 is made of resin, and as shown in FIG. 1, has an axially long guide groove 8 opened to the side surface from a substantially central portion to a rear end, and a similar guide groove 8 # on the opposite side surface. A guide section 2 is provided. Guide part 2
In the front half of each of the holes 42, 4
A tubular portion 9 having a 2 ｀ partition portion 15 and an open front end is provided, and a step portion 30 is provided at the rear end of the tubular portion 9. An engagement portion 12 is formed. A partial or ring-shaped projection 17 is formed on the inner wall of the rear end hole 18 of the center shaft 1, and a wall 19 for restricting the rotation range of the cylindrical cam 4 described later is provided at the rear end.

The front end of the front shaft 3 is tapered, and the front end of the front end is provided with an inner step 26 at the front end of the inner hole. In the rear end hole, an engagement groove 11 is provided which engages with an engagement portion 12 provided on the outer peripheral portion of the cylindrical portion 9 of the guide cylinder, and prevents the cylindrical portion 9 of the central shaft 1 from coming off and being prevented from rotating. Have been. In addition, the cylindrical portion 9
And the front shaft 2 are detachably fixed by an appropriate force. (Same as the configuration of the front shaft in Japanese Utility Model Laid-Open No. 64-3491)

[0007] The cap 31 is made of resin, and has a cylindrical cam 4 integrally at the tip. The cylindrical cam 4 has a cylindrical shape, and has a cam slope 13 which is displaced circumferentially forward and backward at a front end edge, and a notch 14 is formed at the foremost end of the cam slope 13.
On the side surface, a partial or ring-shaped projection 16 for elastically passing over the projection 17 of the central shaft 1 and preventing the central shaft 1 from falling off is provided.
The rear end of the cylindrical cam 4 is provided with a rib 20 which abuts against the wall 19 of the center shaft and regulates the rotation to about 180 °.

Incidentally, the cap 31 is connected to the cylindrical cam 4.
And a slit 32 is formed in the side surface of the cylindrical portion, and projections 33 and grooves 34 are provided alternately on both sides of the slit 32. Further, an eraser holder 36 having an eraser 41 fixed to the rear end thereof is mounted in the cylindrical portion so that an engagement protrusion 39 provided on an outer periphery thereof is removably fitted into the groove 34 of the slit 32. The engaging projection 39 is formed at the tip of an elastic piece 38 provided on the side surface of the eraser holder 36, and engages with the groove 34 while elastically displacing with the groove 34 to keep the eraser 41 in the projected state. Further, the center of the engaging projection 39 is slightly protruded to form the operating projection 40, and the eraser holder 36 can be moved while moving the operating projection 40 back and forth to release the engagement between the engaging projection 39 and the groove 34. And A crown 35 is fixed to the rear end of the cylindrical portion.

The sliding piece 5 has a projection 21 on its outer surface.
The rear end surface of the projection 21 has a central portion projecting, and both sides thereof have cam slopes having substantially the same slope as the cam slope 13 of the cylindrical cam 4 described above. In addition, a hole is provided which abuts against the flange portion 23 of the core pipe 22 to protrude and fit the rear of the core pipe 22 long. Like the sliding piece 5, the sliding piece 5 # has a projection 21 # and a cam slope, and a tip end is provided with a locking portion 25 for fastening the rear end of the writing body 7 such as a ball-point pen. Incidentally, the locking portion may be formed in a pipe shape and the rear end of the writing body may be fitted.

The mechanical pencil 6 has a built-in general chuck mechanism, is joined to the core pipe 22 via a joint 28 connected to the chuck mechanism at the rear end, and has a flange portion 23 provided behind the core pipe 22. , The sliding piece 5 is fitted thereto, and the rear end hole of the core pipe 22 protruding from the rear end of the sliding piece 5 is closed by a tail plug 24 or the like. The leading-out step 27 of the mechanical pencil 6 is the leading axis 2
This is performed by moving the chuck in accordance with the axial movement of the sliding piece 5 in a state of contact with the inner step portion 26 of FIG.

Next, a description will be given in assembling order. A pencil 6 and a writing pen 7 such as a ball-point pen have respective sliding pieces 5 and 5 # connected to the rear end thereof, so that each of the above-mentioned center axis guides 2 can be connected. It is movably fitted in the guide grooves 8, 8 ′, and the front end face of each sliding piece 5, 5 ｀ and the partition 1 on the front of the guide grooves 8, 8 ｀.
5 is urged rearward by return springs 29 and 29 # interposed between the return springs. The cap 31 has the cylindrical cam 4 elastically fitted in the rear end hole 18 of the central shaft 1 and is rotatable and stopped at approximately 180 ° in the circumferential direction with respect to the central shaft 1 so as to be fixed. Further, in a state where the mechanical pencil 6 is protruded, the cap 31 can be shifted by the stroke required for centering the center shaft 1 with respect to the center shaft 1, and when the cursive body is stored or the writing body 7 such as a ballpoint pen is protruded. Thus, the rib 20 is brought into contact with the rear end of the center shaft so that the shaft cannot be shifted. Since each sliding piece 5, 5 # is constantly urged backward by the return spring 29, 29 #, its projection 21,
The 21 ° cam slope is kept in contact with the cam slope 13 of the cylindrical cam 4.

The engaging portion 12 of the cylindrical portion 9 is elastically fitted into the engaging groove 11 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 30 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 31 is rotated in one direction with respect to the front shaft 3 or the center shaft 1 in this state, the sliding piece 5 moves forward, and the notch 14 at the foremost end of the cam slope 13 of the cylindrical cam 4 becomes one of the mechanical pencils 6. Sliding piece 5
And the writing tip is projected from the tip end of the front shaft. In addition, cap 3 is attached to tip shaft 3 or center shaft 1.
When 1 is rotated to the other side, the sliding piece 5 is retracted, the writing tip of the mechanical pencil writing body 6 is immersed from the tip end of the tip shaft, and the sliding piece 5 # is advanced to write the other writing piece 7 such as a ballpoint pen. Is projected from the tip end of the front shaft.

On the other hand, an eraser holder 36 is fitted from the rear end of the cylindrical portion of the cap 31, and the projection 33 of the eraser holder 36 is engaged with the groove 34 of the slit 32 provided in the cylindrical portion, so that the eraser holder 36 is inserted into the cylindrical portion. The part is slidable. The crown 35 is fixed to the rear end of the cylindrical portion, and the eraser 41 is inserted from the opening at the rear end of the crown 35, and the rear end of the eraser 41 is fixed to the eraser holder 36.
As described above, when the eraser holder 36 is moved back and forth, the eraser 41 comes out of the opening of the crown 35. The inner diameter of the opening of the crown 35 is provided slightly larger than the outer diameter of the eraser 41.

[0014]

When the cap 31 is rotated in one direction with respect to the front shaft 3 or the center shaft 1, the notch 14 provided at the tip of the cam slope 13 of the cylindrical cam 4 slides on one of the mechanical pencils 6 as shown in FIG. The writing tip is engaged with the moving piece 5 and its writing tip projects from the tip end of the front shaft. At this time, the rib 20 of the cap 31 is in contact with the wall 19 at the rear end of the center shaft 1. In this state, crown 3
When the rear end of the shaft 5 is knocked and the shaft shifts, the movement is transmitted to the sliding piece 5, the core pipe 22, and the pencil writing body 6, and the step 27 at the tip of the writing is transferred to the inner step 26 of the front shaft 3. From the abutted state, the chuck and the joint 28 are axially moved and the core is fed out. When the cap 31 is rotated with respect to the tip shaft 3 or the center shaft 1 to the other side, the mechanical pencil 6
Retreats, and instead the writing tip of the writing body 7 such as a ball-point pen projects from the tip end of the front shaft.

Next, when the operation projection 40 of the eraser holder 36 is pressed and retracted against the cap 31, the engagement projection 39 is disengaged from the groove 34 of the slit 32 and moves, so that the eraser holder 36 is gradually retracted. Then, the eraser 41 is fed out from the opening of the crown 35. When the operation projection 40 is pushed forward, the eraser holder 36 advances, and at the same time, the eraser 41 is immersed in the opening of the crown 35.

[0016]

As described above, according to the present invention, the front shaft, the center shaft integrally provided with the guide portion, and the cap integrally formed with the cylindrical cam are formed into a resin molded product, and the engagement between the front shaft and the cap is joined to the center shaft. By forming a slit integrally provided with a projection and a groove in the cylinder part behind the cap, the projection of the eraser holder fitted in the cylinder part is engaged with the groove of the slit. In contrast, the metal parts are replaced with resin as compared with the conventional example, and the number of parts is reduced. Further, since the assembly is facilitated, the cost can be reduced and the product can be provided at a low cost. In addition, since the operation projection is provided so as to be able to move back and forth, the operation of feeding out the eraser is easy and the usability is good.

[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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Middle shaft 2 Guide part 3 Front shaft 4 Cylindrical cam 5 Sliding piece 5 ｀ Sliding piece 6 Pencil writing body 7 Writing body such as ballpoint pen 8 Guide groove 8 ｀ Guide groove 9 Cylindrical part 10 Knock spring 11 Engagement groove 12 Engagement Part 13 Cam slope 14 Notch 15 Partition part 16 Projection 17 Projection 18 Rear end hole 19 Wall 20 Rib 21 Projection 21 ｀ Projection 22 Core pipe 23 Flange part 24 Tail plug 25 Locking part 26 Inner part 27 Step part 28 Joint 29 Return Spring 29 ｀ Return spring 30 Step 31 Cap 32 Slit 33 Protrusion 34 Groove 35 Crown 36 Eraser holder 37 Fitting part 38 Elastic piece 39 Engagement projection 40 Operation projection 41 Eraser 42 Hole 42 ｀ Hole

Claims (1)

(57) [Scope of request for utility model registration] An engaging portion is provided for fitting the front end of a resin-made front shaft and the front end of a resin-made middle shaft in a non-rotatable and non-removable state, and the two are fixed, and a plurality of guide portions provided on the center shaft are provided. In the guide groove, a plurality of writing bodies having at least one mechanical pencil with a sliding piece fixed to the rear end thereof are biased with return springs between the guide portion and the sliding piece, and each of the writing pieces is moved in the axial direction. the forwardly and rearwardly movably fitted, integral with its rear cylindrical cam provided circumferentially on a front end portion of the cam slope displaced in the axial direction
A resin cap having a slit in a cylindrical portion which extends the guide portion and then fitted onto the center shaft, and secured to allow the axial transition of the cap relative to the inner shaft in rotation and retaining state, also,
Protrusions and grooves are provided alternately on both sides of the slit of the cylindrical portion of the cap , and an eraser holder with an eraser fastened to the rear allows the protrusion provided on the outer periphery to be removably fitted into the groove of the slit. by mounting et al is, to contact the above, each sliding piece on the inclined cam face of the cylindrical cam Te,
By rotating the cap with respect to the front shaft or 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 moved out of the front shaft tip port. Knock on the end to allow the core to extend, and the outer periphery of the eraser holder against the cap
A double writing implement characterized in that the eraser can be made to protrude and retract from the rear end of the cap by moving the projection provided on the front and back.