JP2566094Y2 - 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 cylinder to be fixed and a cam slope contacting a sliding piece attached to two writing bodies fitted to the guide cylinder at the front end, and the rear end forms a knock portion for 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 is provided so that a resin-made front shaft and a resin-made guide tube can not rotate with respect to each other and cannot be removed. The fitting portions to be fitted are provided, and both are fixed.
Cam also a plurality of writing bodies were fastened to sliding pieces at the rear end a plurality of guide grooves provided in the guide tube is fitted freely respectively move back and forth through the return spring, also cylindrical cam is displaced in the axial direction A slope is provided circumferentially at the front end and a brim is provided at the inner surface.
The flange is provided in the circumferential groove provided on the outer periphery of the rear end of the guide cylinder.
The cylindrical cam is freely rotatable with respect to the guide cylinder, and has been locked and stopped. In addition , the center shaft is attached to the rear of the guide tube so as to cover the guide tube and the cylindrical cam, the guide tube is rotatable with respect to the center shaft and is prevented from coming off , and the cylindrical cam is not allowed to rotate with respect to the center shaft. Also provided long extending the cylindrical portion in the rear of the cylindrical cam, it protrudes its cylindrical portion from the center pole rear end, and the tubular portion has a slit is provided, eraser holder to fasten the eraser rearward thereof A resin cap having a spiral groove formed in the inner diameter portion is rotatably stopped in the cylindrical portion of the cylindrical cam while being fitted into the cylindrical portion with the projection fitted in the slit, and the spiral groove of the cap is also provided. Disappear
That is, the protrusion of the rubber holder is fitted and provided. As described above, by rotating the center shaft with respect to the front shaft, the tip of the writing body selectively emerges from the front shaft front end opening, and when the cap is rotated with respect to the middle shaft, the eraser can appear and disappear . Also, among the plurality of cursive, when a single sharp pencil cursive least, in a state where the tip of the mechanical pencil cursive protrudes from front barrel tip opening, the guide cylinder flange of the cylindrical cam faces The width of the circumferential groove is widened, and the shaft is free to move within the range where the cylindrical cam extends the core with respect to the guide cylinder.The knock required for core advance is located between the rear end of the center shaft and the tip of the cap. A gap is provided for the stroke.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The dual writing implement of the present invention includes a guide cylinder 1, a tip shaft 2, a cylindrical cam 3, a center shaft 4, a pair of sliding pieces 5, 5 ｀, a pencil pencil writing body 6, a writing body 7, such as a ballpoint pen, a cap 29, and an eraser holder 33. The eraser 36 is a main component. First, the guide cylinder 1 is made of resin and has an axially long guide groove 8 which is opened from the center to the rear end, as shown in FIGS. Axially extending guide groove 8 ｀ which is open from the part to the front end of the rear end
have. In the front half of the guide tube 1, each guide groove 8,
A cylindrical portion 9 having a partition portion 15 having a hole 41, 41 ° communicating with 8 ° and having an open front end is provided, and a flange portion 28 is formed on the outer peripheral portion near the rear end of the cylindrical portion 9. Further, a bulging engagement portion 12 is formed on an outer peripheral portion in front of the flange portion 28. Further, on the side surface slightly behind the rear end of the cylindrical portion 9, there is formed an engaging portion 39 which bulges in a circumferential shape to be fitted with an engaging portion 27 of the center shaft 4 described later. A circumferential groove 16 is provided on the side surface of the rear end of the guide cylinder in the circumferential direction.

The front end of the tip shaft 2 is tapered, and has an inner step 24 at the tip 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 guide cylinder 1 from coming off and from rotating. . The cylindrical portion 9 and the front shaft 2 are detachably fixed by an appropriate force. (The actual opening 64
The structure is basically the same as that of
You. )

As shown in FIGS. 3 and 4, the cylindrical cam 3 is made of resin and has a cylindrical shape, and has a cam slope 13 which is circumferentially displaced back and forth at a front end edge. Notch 1
4 are formed. The side surface has a groove 38 that fits into a rib 37 of the center shaft 4 described later, and the fan-shaped collar 17 is provided on the inner surface behind the cam slope 13. Further, two long slits 32 are formed on the axial side surface of the cylindrical portion 3a extending long behind.

The center shaft 4 has an engaging portion 27 which is a circumferential groove on the inner surface of the front end and the cylindrical cam 3 on the inner surface of the rear end.
The rib 37 is formed so as to fit into the groove 38, and the cylindrical cam 3 is not rotatable with the center shaft 4 and is free to shift.

As shown in FIGS. 5 and 6, the sliding piece 5
It has a projection 19 on the outer surface, and a central portion protrudes from the rear end surface of the projection 19 and both sides thereof have the cam slope 1 of the cylindrical cam 3 described above.
3 has a cam slope having substantially the same gradient. Also, core pipe 2
A hole that abuts on the flange portion 21 of the “0” to protrude and fit behind the core pipe 20 is provided. Also shown in FIG.
As shown in FIG.
And a cam slope, and a locking portion 23 for fixing the rear end of the writing body 7 such as a ball-point pen is provided at the tip. Incidentally, the locking portion may be formed in a pipe shape and the rear end of the writing body may be fitted.

The cap 29 is made of resin, has a clip 30 on the outer surface of the rear end, and has a spiral groove 31 on the inner surface. The eraser holder 33 has a bottomed hole at the rear end for fastening the rear end of the eraser 36, the outer periphery of the front end is fitted into the slit 32 of the cylindrical cam 3, and the cap 2
Nine helical grooves 31 are provided with protrusions 34 fitted at appropriate positions.

The mechanical pencil 6 has a built-in general chuck mechanism, is joined to the core pipe 20 via a joint 40 connected to the chuck mechanism at the rear end, and has a flange 21 provided at the rear of the core pipe 20. The sliding piece 5 is fitted in contact with the sliding piece 5, and the rear end hole of the core pipe 20 protruding from the rear end of the sliding piece 5 is closed by a tail plug 22 or the like. The leading end of the mechanical pencil 6 is drawn by the tip 2
This is performed by sliding the chuck by the axial movement of the sliding piece 5 in a state in contact with the inner step portion 24 of FIG.

A writing body 7 such as a mechanical pencil 6 and a ballpoint pen is connected to respective sliding pieces 5 and 5 'at the rear end so as to be movable in the guide grooves 8 and 8' of the guide tube 1 described above. It is fitted and is urged rearward by return springs 26, 26 # interposed between the front end surfaces of the sliding pieces 5, 5 # and the guide grooves 8, 8 # of the guide tube 1 and the partition 15 on the front surface. You. The cylindrical cam 3 is elastically fitted with a collar 17 in the circumferential groove 16 of the guide cylinder 1 and is rotatably and circumferentially rotatable with respect to the guide cylinder 1 so as to be fixed. Normally, the circumferential groove 16 and the brim 17 are dimensioned so that the cylindrical cam 3 is prevented from rotating while each writing body projects from the tip end of the front shaft.
Also, with the mechanical pencil protruding,
The circumferential groove position facing 7 is formed wider by the stroke required for center feeding. Further, since the sliding pieces 5, 5 # are urged rearward by the return springs 26, 26 #, the cam slopes of the projections 19, 19 # always keep the cam slope 13 of the cylindrical cam 3 in contact. ing.

The guide cylinder 1 and the cylindrical cam 3 are fitted to each other to
Is mounted, and the engaging portion 39 is elastically fitted into the engaging groove 27 of the center shaft 4 with the rear surface of the flange portion 28 of the guide cylinder 1 in contact with the front surface of the center shaft 4. The guide cylinder 1 is rotatable, and the rib 37 of the center shaft 4 is fitted into the groove 38 of the cylindrical cam 3 so that the cylindrical cam 3 cannot rotate with respect to the center shaft 4 but can move freely. The front shaft 2 is fitted in the tube portion 9 of the guide tube 1, the rear end surface of the front shaft 2 is in contact with the front surface of the flange portion 28, and the engaging portion 12 of the tube portion 9 The front shaft 2 and the guide cylinder 1 are fixed to the engagement groove 11 elastically so that the front shaft 2 and the guide cylinder 1 are prevented from rotating and coming off. The tip shaft 2 is detachable with an appropriate force. In this state, when the center shaft 4 is rotated in one direction with respect to the front shaft 2, the sliding piece 5 moves forward and the notch 14 at the foremost end of the cam slope 13 of the cylindrical cam 3 slides the one mechanical pencil 6 Top 5
And the writing tip projects from the tip of the front shaft. When the center shaft 4 is rotated in the other direction with respect to the front shaft 2, the sliding piece 5 retreats, the writing tip of the mechanical pencil writing body 6 is immersed from the front shaft tip opening, and the sliding piece 5 # is advanced. The writing tip of the writing body 7 such as the other ballpoint pen projects from the tip end of the front shaft.

On the other hand, an eraser holder 33 is elastically fitted to the cylindrical portion of the cylindrical cam 3 protruding from the rear end of the center shaft 4, and a projection 34 of the eraser holder 33 is provided on the cylindrical portion of the cylindrical cam 3. 32, the eraser holder 33 is rotatably stopped and slidable on the cylindrical portion of the cylindrical cam 3. Further, the cap 2 is fitted to the cylindrical portion of the cylindrical cam 3 and
9 is resiliently fitted, is rotatably fixed to the cylindrical portion, and is fixed to the cylindrical portion.
Fits into the spiral groove 31 of the cap 29. A crown 35 having an opening at the rear end is fixed to the rear end of the cylindrical portion of the cylindrical cam 3 in a state of being substantially in contact with the rear end of the cap 29, and the eraser 3
6 is inserted from the opening of the crown 35, and the rear end of the eraser 36 is fixed to the eraser holder 33. As described above, when the cap 29 is rotated with respect to the cylindrical cam 3, the eraser 36 protrudes and retracts from the opening. The inner diameter of the opening of the crown 35 is provided slightly larger than the outer diameter of the eraser 36.

[0015]

When the center shaft 4 is rotated in one direction with respect to the front shaft 2, the notch 14 provided at the tip of the cam slope 13 of the cylindrical cam 3 makes the sliding piece 5 of one mechanical pencil 6 as shown in FIG. And the writing tip projects from the tip end of the front shaft. At this time, the flange 17 of the cylindrical cam 3 is located at the wide portion of the circumferential groove 16. In this state, when the rear end of the crown 35 is knocked and the cylindrical cam 3 is axially moved by the stroke of the gap S formed between the rear end of the center shaft 4 and the front end of the cap 29, the operation is changed to the sliding piece 5, The wick is transmitted to the core pipe 20 and the mechanical pencil 6 and the chuck 40 moves along with the joint 40 from the state where the step 25 at the writing tip abuts against the inner step 24 of the front shaft 2, and the core is fed out. Center axis 4 against front axis 2
When the is rotated to the other side, the mechanical pencil 6 is retracted, and instead the writing tip of the writing instrument 7 such as a ballpoint pen projects from the front end of the front shaft.

Next, when the cap 29 is rotated in one direction with respect to the center shaft 4, the projections 34 of the eraser holder 33 move along the spiral grooves 31 of the cap 29, so that the eraser holder 33 gradually retreats. The eraser 36 is paid out from the opening of the crown 35. When the cap 29 is rotated to the other side, the eraser holder 33 moves forward, and at the same time, the eraser 36 enters through the opening of the crown 35.

[0017]

As described above, according to the present invention, the front shaft, the guide tube, the center shaft, the cylindrical cam and the cap are formed as resin molded products, and the guide tube, the front shaft and the engaging portion for the center shaft are integrally provided.
In the conventional cited example, the cylinder cam was provided with a long and extended cylinder part, a slit was formed in the cylinder part, an eraser holder was fitted, and a cap with a spiral groove in the cylinder part was fastened. On the other hand, metal parts are replaced with resin, 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 cap is provided at the rear end of the center shaft so as to be easily picked with a finger, 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.

FIG. 2 It is a longitudinal cross-sectional view of a guide cylinder.

FIG. 3 It is a longitudinal section of a cylindrical cam.

FIG. 4 is a side view seen from the front of the cylindrical cam .

FIG. 5 It is sectional drawing of the sliding piece 5.

FIG. 6 is a top view of FIG . 5 ;

FIG. 7 FIG. 5 is a front view of a sliding piece 5 #.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Guide cylinder 2 Front shaft 3 Cylindrical cam 3a Cylindrical part 3b Locking part 3c Locking part 4 Center shaft 5 Sliding piece 5 ｀ Sliding piece 6 Mechanical pencil 7 Writing body such as ballpoint pen 8 Guide groove 8 ｀ Guide groove 9 Tube Part 10 Knock spring 11 Engagement groove 12 Engagement part 13 Cam slope 14 Notch 15 Partition part 16 Peripheral groove 17 Flange 18 Through hole 19 Projection 19 Projection 20 Core pipe 21 Flange part 22 Tail plug 23 Locking part 24 Inner step 25 Step 26 Return Spring 26 Return Spring 27 Engagement Groove 28 Flange 29 Cap 30 Clip 31 Spiral Groove 32 Slit 33 Eraser Holder 34 Projection 35 Crown 36 Eraser 37 Rib 38 Groove 39 Engagement Part 40 Joint 41 Hole 41 ｀ Hole

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 5-28691 (JP, U) JP-A 5-28690 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of guides provided on a guide cylinder provided with engaging portions for fixing the front end of a resin-made shaft and the front end of a resin-made guide cylinder to each other in a non-rotatable and non-removable state. and biasing return spring between a plurality of writing bodies were fastened to sliding pieces on the rear end into the groove guide cylinder and the sliding piece movably in fitted front and rear respectively axially, also cylindrical cam A cam slope displaced in the axial direction is provided circumferentially at the front end, a flange is projected from the inner surface, and a slit is provided in a cylinder part extended further rearward. By fitting the collar of the cylindrical cam into the circumferential groove provided on the outer periphery of the end, the cylindrical cam is rotated with respect to the guide cylinder and fixed in a state where it does not come off ,
Further, the rear and the cylindrical cam of the guide cylinder and the inner shaft made to be fitted to the resin is fastened to the guide tube, the guide tube with respect to the middle axle rotatably is and retaining, also cylindrical with respect to the inner shaft cam The rotation is stopped.On the other hand, an eraser holder with an eraser fastened to the rear of the cylindrical cam protruding from the rear end of the center shaft is fitted with a projection provided on the outer periphery of the cylinder by fitting it into the slit of the cylinder. is, the cylindrical portion resin cap on the outer periphery provided with a helical groove in the inner diameter portion of is fastened to and retaining state rotatable, projections eraser holder cap
As described above, each sliding piece is alternately moved in the front-rear direction by rotating the center shaft with respect to the front shaft by bringing each sliding piece into contact with the cam slope of the cylindrical cam as described above. A dual writing implement wherein the tip of each writing body is selectively made to protrude and retract from the tip end of the front shaft, and the eraser is made to protrude and retract from the rear end of the cap by rotation of the cap with respect to the center shaft. Wherein the plurality of cursive, both one as mechanical pencil Scribe less, the tip of the mechanical pencil cursive so as to protrude from the front barrel tip opening, the cylindrical cam collar opposite the guide tube The position of the circumferential groove is wide, the axis of the cylindrical cam can be freely shifted within the range where the mechanical pencil is extended to the guide cylinder, and the core is extended between the rear end of the center shaft and the tip of the cap. 2. The double writing instrument according to claim 1 , wherein a gap is provided for a knock stroke necessary for the cap, and the cap is configured to be able to move freely with respect to the center shaft.