JPH0852988A - Multiple writing tool - Google Patents

Abstract

PURPOSE:To simplify an eraser feed mechanism and thereby cut a manufacturing cost. CONSTITUTION:This multiple writing tool is composed of a spiral cylinder 19, a collar part 25 which comes into contact with the front end of the spiral cylinder 19, and an inner cylinder 23 with an engagement part 35 which becomes engaged with the rear end of a cylinder cam 13 in a freely detachable manner, forward of the collar, and prevents itself from slipping off but rotates against the spiral cylinder. In addition, the tool has a slit part 28 formed running through to the rear end, behind the inner cylinder 23, and a slider 30 with a protrusion 32 provided on the lateral facing of the slit part 28 for holding an eraser 38. The protrusion runs through the slit part and becomes engaged with a spiral groove 20. Thus the protrusion is guided by the slit part to slide in the axial direction of the slider by rotating the rear end part of the spiral cylinder against a cap, and the eraser pops up from the rear end of the inner cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a double-sided writing instrument which allows an eraser to be drawn out by rotating the rear end of a barrel.

[0002]

2. Description of the Related Art Conventionally, for example, JP-A-58-26589 and JP-A-58-26577 disclose that an eraser or other writing instrument is provided at the rear end of a barrel. In addition, as a conventional example, the applicant of the present invention has a fairness of 2-28.
Japanese Patent Publication No. 077 discloses a compound writing instrument in which other articles such as an eraser and other writing instruments are replaceably provided at the rear end of the barrel. By the way, the eraser feeding mechanism which is an example of the conventional example has a complicated structure, has a large number of parts, and cannot be provided at a low cost.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to simplify the structure of the conventional eraser feeding mechanism, reduce the cost for members and assembly, and to provide an inexpensive eraser feeding type double writing instrument. To aim.

[0004]

SUMMARY OF THE INVENTION A compound writing instrument of the present invention devised to achieve the above object comprises a plurality of writing instruments having at least one sliding piece fixed to a rear end thereof as a mechanical pencil. , A cylinder which is movably fitted in axial sliding grooves provided on a guide cylinder fixed to the front shaft and has a circumferential cam slope on the front surface and which is integrated with the cap in the rotational direction. A cam is rotatably fitted around the outer periphery of the guide cylinder, the cam slope is brought into contact with the sliding piece, and the cylindrical cam is rotated to slide the slide piece along the cam slope. The front writing part, which is configured to alternately project or store the writing body from the front end of the front shaft, and the rear end of the cylindrical cam are integrally connected to each other and the rear end can be rotated to allow the eraser to appear and disappear. In a compound writing instrument equipped with a rear eraser feeding body, an eraser feeding The projecting body is provided with a spiral cylinder 19 having a spiral groove 20 formed in the inner hole surface, a locking portion inserted into the inner hole of the spiral cylinder and rotatably locked with respect to the spiral cylinder, and a front end of the spiral cylinder. A slit portion 28 ′ penetrating to the rear end is formed on a side surface of a flange portion 25 that is in contact with the flange portion 25, and a tubular portion 24 integrally provided with a locking portion in front of the flange portion, and a tubular portion 28 integrally extended behind the tubular portion 24. And an eraser 38 in the inner cylinder.
A slider 30 having a projection 32 on its side is sandwiched between the projection and the slider, and the projection penetrates the slit portion and is engaged with the spiral groove. The engagement provided on the cylindrical portion 24 of the inner cylinder at the rear end of the cylindrical cam 13. Locking portions that engage with and lock the locking portions are provided to fix each other, and the protrusion 32 is guided by the slit portion 28 ′ by the rotation of the spiral cylinder 19 with respect to the cap 2 so that the slider 30 slides in the axial direction. The eraser 38 can appear and disappear from the rear end of the spiral cylinder.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. First, a shaft cylinder is formed by a front shaft 1 and a cap 2 rotatable therewith, and a guide cylinder 4 having axial sliding grooves 3 and 3'in which the front shaft is opened is formed in the front shaft 1.
It is fixed and stored. A core pipe 7 having a front end connected to a mechanical pencil 5 and a sliding piece 6 fixed near a rear end is movably fitted in one sliding groove 3, and a rear end is fitted in the other sliding groove 3 '. Similarly, a sliding pipe 6'is fixedly attached, and a receiving pipe 9 into which a rear end of a ballpoint pen 8 is inserted is similarly movably fitted in the inner hole portion.

Between the flange portion 10 of the core pipe 7 where the front end of the sliding piece 6 stops and the tip step portion 11 of the guide tube 4, and between the front end of the sliding piece 6 and the tip step portion 11 of the guide tube. Return springs 12 and 12 'are respectively interposed between them to press each cursive body backward. A cylindrical cam 13 is rotatably fitted on the outer peripheral portion of the rear half of the guide cylinder 4,
A cam slope 14 formed in a circumferential shape on the front surface of the cylindrical cam 13.
Is in contact with the sliding pieces 6, 6 '.

A notch portion 15 is formed at the tip of the cam slope 14, and projections 16 and 16 'that engage with the notch portion 15 are also provided on the sliding pieces 6 and 6'. When the notch 15 of the cylindrical cam 13 is engaged with the projection 16 of the sliding piece 6 as shown in the figure, the mechanical pencil 5 projects from the tip end opening 17 of the front shaft, and the cylindrical cam 13 rotates 180 ° to cause the notch. When the portion 15 is engaged with the projection 16 ′ of the sliding piece 6 ′, the ballpoint pen 8 projects from the tip end opening 17 of the tip shaft. The rotation of the cylindrical cam 13 is performed by operating the cap 2, so that the cylindrical cam 13 is integrally attached to the cap 2 in the rotational direction, but is movable in the axial direction.

A substantially fan-shaped (not shown in the drawing) flange portion 41 is formed on the inner surface of the cylindrical cam 13, and an axial vertical groove into which the flange portion fits also on the outer surface of the rear end portion of the guide tube 4 (in the drawing). (Not shown above) and a circumferential groove 18 in the circumferential direction are provided, and in a state where the mechanical pencil 5 is projected as shown in the figure, the collar portion 41 is located in the vertical groove and can move in the axial direction by a knocking operation so that the mechanical pencil 5 can be moved. The lead-out of the core 5 is secured, and when the ball-point pen 8 is projected, the flange portion 41 is located in the circumferential groove 18 to prevent the cylindrical cam 13 from advancing. Further, the cylindrical cam 13 has a groove 13a, a protrusion 13c, and a groove 13b, which are arranged in series on the inner surface of the rear end hole thereof and which engages with a locking portion of an eraser feeding body to be described later and fixes them in a detachable manner. The part is formed at the required location. A tapered inlet is formed at the rear end of the groove 13a. (Not shown)

On the other hand, the eraser feeding body is constituted by a spiral cylinder 19, an inner cylinder 23, a slider 30, and an eraser 38 as shown in FIG. The spiral cylinder 19 has a circumferential engagement groove 21 formed in the vicinity of the front end of the inner hole surface, and further has an axial spiral groove 20 formed behind it. Further, an inclined step portion 22 is circumferentially formed at the rear end of the inner hole, and a rear end hole through which the eraser 38 projects is penetrated.

The inner cylinder 23 is provided with a collar portion 25 on the front side, a circumferential locking projection 29 on the rear side adjacent to the collar portion 25, and a rib 26a, a groove portion 26c, and a rib 26b on the front outer peripheral portion of the collar portion 25. The slit portion 28 penetrating from the front end step portion 27 to the rear end on the side surface of the tubular portion 24 integrally formed behind the tubular portion 24 and the tubular portion 24 having the locking portion formed at a required position. It is formed at two opposite points, and an inclined step portion 27 is formed at a substantially rear end of the tubular portion 28. The tip of the rib 26b is formed in an arrowhead shape. (Not shown)

The slider 30 has a cylindrical portion 30 "at its front end, and an eraser holding piece 31 which is elastically deformable is provided at two opposing positions extending to the rear end of the cylindrical portion 30".
Further, a projection 32 is formed on each outer peripheral surface of the eraser holding piece 31 at a position where it can be engaged with the spiral groove 20, and a rear end portion 34 is formed by having an inclined step portion 33 on the rear side. There is.
Further, a protrusion locking portion 35 is formed on the inner peripheral surface.

Next, the slider 30 is fitted into the tubular portion 28 of the inner cylinder 23, and the eraser holding piece 31 is fitted into the slit portion 28 '. Further, an eraser 38 is inserted and locked by the locking portion 35 of the eraser holding piece 31 in a biting manner. From that state, the inner cylinder 23 is fitted into the inner hole of the spiral cylinder 19, and the protrusion 32 of the slider 30 is attached to the spiral groove 20.
Is engaged with. Further, the locking projection 29 of the cylindrical portion 24 of the inner cylinder elastically engages with the locking groove 21 of the spiral cylinder, and the collar portion 25 abuts on the front end of the spiral cylinder 19. Also, at that time, the stepped portion 2 of the tubular portion 28
7 comes into contact with the step portion 22 of the spiral cylinder 19 and the slit portion 28 '
Deformation in the direction of diameter reduction is prevented. As described above, the spiral cylinder 19 is rotatable with respect to the inner cylinder 23 so that it cannot be pulled out, and an eraser feeding body is constituted. In addition, the spiral cylinder 1 with respect to the inner cylinder 23
By rotating 9, the protrusion 32 is guided by the slit portion 28 ′ and the slider 30 slides in the axial direction.

Next, the eraser feeding body is inserted from the rear end hole 39 of the cap 2, and the engaging portion provided on the cylindrical portion 24 of the inner cylinder is provided on the inner surface of the rear end hole of the cylindrical cam 13. The rear end of the spiral cylinder 19 is appropriately protruded from the rear end hole 39 of the cap 2.
Further, the eraser feeding body is detachable from the cylindrical cam. By the way, the rib 26 that is the locking portion of the tubular portion 24
a and 26b are groove portions 13a which are locking portions of the cylindrical cam 13,
The protrusions 13c are elastically fitted into the groove portions 26c so as not to come off. Further, when the cylindrical portion 24 and the cylindrical cam 13 are mounted, the arrowhead portion at the tip of the rib 26b faces the taper portion at the entrance of the groove portion 13a, so that they can smoothly come in contact with each other without worrying about their mutual alignment.

[0014]

Therefore, when the rear end portion of the spiral cylinder 19 is rotated with respect to the cap 2, the inner cylinder 23 fixed to the cylindrical cam 13 is prevented from rotating with respect to the cap 2, so that the spiral cylinder 19 is rotated with respect to the inner cylinder 23. Is rotated and the protrusion 32 of the slider 30 that engages with the spiral groove 20 slides on the slit portion 28 ′ of the inner cylinder, so that the slider 30 moves. Therefore, along with that, the eraser 38 appears and disappears from the rear end of the spiral cylinder 19.

By rotating the cap 2 left and right with respect to the tip shaft 1, the tip of the mechanical pencil 5 or the ball-point pen 8 is alternately projected and locked from the tip end opening 17 of the tip shaft. When the mechanical pencil 5 is projected, the lead is extended by knocking the rear end of the spiral cylinder 19 with respect to the cap 2.

At the end of the eraser 38, the stepped portion 27 of the sandwiching piece 31 is moved to the spiral cylinder 1 at the rear end of the slider 30.
Since the rear end portion 34 projects in a state of being in contact with the step portion 22 of 9, the end of the eraser 38 can be seen. Also, the protruding rear end portion 3
The inner surface of the spiral cylinder 19 is provided with an eraser locking portion 35.
If a suitable chamfer is provided on the edge of the rear end hole so that the rear end portion 34 can be easily deformed in the expanding direction, the remaining portion of the eraser is removed.
Easier to install a new eraser.

[0017]

As described above, the present invention is extremely useful because the function of increasing the function of the eraser is accommodated at the rear end of the cap and the function is increased according to the purpose. Also, since the structure is simple, it is possible to provide an inexpensive compound writing instrument by omitting members and assembling. Further, there is an advantage that it is possible to know when the eraser is finished and that the eraser can be easily replaced. Further, since the eraser feeding body is detachable, there is an advantage that application units other than the eraser can be freely attached.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the latter half of FIG.

FIG. 3 is a vertical sectional view of an eraser feeding body.

FIG. 4 is a cross-sectional view of essential parts showing a state when the eraser is finished.

[Explanation of symbols]

 1 Tip Shaft 2 Cap 3 Sliding Groove 3'Sliding Groove 4 Guide Tube 5 Mechanical Pencil 6 Sliding Top 6'Sliding Top 7 Core Pipe 8 Ballpoint Pen 9 Receiving Pipe 10 Flange 11 Tip Step 12 Return Spring 12 'Return Spring 13 Cylindrical cam 13a Groove portion 13b Groove portion 13c Projection portion 14 Cam slope surface 15 Notch portion 16 Protrusion 16 "Protrusion 17 Tip shaft tip port 18 Circumferential groove 19 Spiral cylinder 20 Spiral groove 21 Locking groove 22 Step portion 23 Inner cylinder 24 Cylindrical section 25 Collar part 26a Rib 26b Rib 26c Groove part 27 Step part 28 Tube part 28 'Slit part 29 Locking projection part 30 Slider 30' Tube part 31 Clamping piece 32 Protrusion 33 Step part 34 Rear end part 35 Locking part 36 Clip 37 Base part 38 Eraser 39 Rear end hole 40 Guide protrusion 41 Collar

Claims (2)

[Claims] 1. At least one fixed sliding piece at the rear end.
A plurality of cursive writings, each of which is a mechanical pencil, are movably mounted in sliding grooves in the axial direction provided on a guide cylinder that is fixed to the tip shaft, and a circumferential cam slope is provided on the front surface. Then, a cylindrical cam, which is integrated with the cap in the rotational direction, is rotatably fitted on the outer peripheral portion of the guide cylinder, the cam slope is brought into contact with the sliding piece, and the cylindrical cam is rotated to slide. A front writing part configured to alternately project or store each writing body by sliding the top along the slope of the cam, and a rear end integrally connected to the rear end of the cylindrical cam. What is claimed is: 1. A compound writing instrument comprising a rear eraser feed-out body in which an eraser can be retracted by rotating a portion, wherein the eraser feed-out body comprises a spiral cylinder 19 having a spiral groove 20 formed in an inner hole surface, and the spiral cylinder. 19 is inserted in the inner hole of the spiral cylinder 19
On the other hand, a cylindrical portion integrally provided with a locking portion that locks only in a rotatable manner, a collar portion 25 that abuts on the front end of the spiral cylinder 19, and a locking portion composed of a rib and a groove portion in front of the collar portion 25. 24, and an inner cylinder 23 in which a slit portion 28 ′ penetrating to the rear end is provided on the side surface of a cylinder portion 28 integrally extended to the rear of the cylinder portion 24,
Further, the slider 30 having the protrusion 32 on the side surface is inserted into the inner cylinder 23 by sandwiching the eraser 38 in the forward direction, and the protrusion 32 penetrates the slit portion 28 'and is engaged with the spiral groove 20. At the rear end of the cylindrical cam 13, there is provided an engaging portion that engages with and engages with the engaging portion provided on the cylindrical portion 24 of the inner cylinder 23 to fix them to each other, and to project by rotation of the spiral cylinder 19 with respect to the cap 2. 32. The multiple writing instrument characterized in that 32 is guided by the slit portion 28 'so that the slider 30 slides in the axial direction so that the eraser 38 can be retracted from the rear end of the spiral cylinder 19. 2. An inclined step portion 27 is formed at a substantially rear end of a cylindrical portion 28 of the inner cylinder 23, and a slit portion 28 is formed so as to be fitted to the inclined step portion 27.
A step portion 22 is formed at the rear end of the inner hole of the spiral cylinder 19 to prevent the deformation of the wheel in the radial direction, and a step portion 33 is formed behind the eraser holding piece 31 of the slider 30 to form the slider 30. At the retreat limit of, the step portion 33 comes into contact with the step portion 22, and
The double-sided writing instrument according to claim 1, wherein a rear end portion 34 of the eraser sandwiching piece 31 projects from the rear end hole of the spiral cylinder 19 so that the final state of the eraser 38 can be confirmed.