JPH09156288A - Combined type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve usability and appearance and to fit two kinds of rubber eraser letting-out sides to the writing side according to the user's preference. SOLUTION: The rear holder 4 is fixed removably and integrally to the rear part of a cylindrical cam 5 and a rubber eraser letting-out device so designed that a rubber eraser 51 is projected and withdrawn by rotating the rear end part projecting from the rear holder 4 is provided in an inner hole 38 in the rear of the rear holder. The device holds the eraser 51, while a slider 45 having a projection 47 on the lateral side makes the projection 47 fit in a slit 43 and a helical groove 34, and the rubber eraser 51 is moved forward and backward with rotation of the helical groove 34. In the other way, the engaging projection provided on the outer periphery of the slider 45 to the rear part of which the rubber eraser 51 is fixed is so made that it can engage with and disengage from an engaging part groove of the slit 43, and the rubber eraser 51 is projected and withdrawn from the rear end of the rear holder 4 by moving the slider 45 forward and backward in relation to the rear holder 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple writing instrument in which the tips of a plurality of writing bodies can be alternately retracted and retracted at the front end of the front shaft, and an eraser can be retracted and retracted from the rear end of the rear shaft.

[0002]

2. Description of the Related Art Conventionally, as an example of a double-type writing instrument, as shown in Japanese Utility Model Application Laid-Open No. 64-3491 by the same applicant, a sliding groove for guiding two writing objects 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.
Further, as seen in Japanese Patent Application Laid-Open No. 3-79397, there is a circumferential cam slant surface which is displaced in the axial direction at the rear end edge of the sliding piece, and a cam engaging projection that abuts against the slanting cam slant surface is formed in the inner hole portion of the cap. There is a double-sided writing instrument. Also, the actual development Sho 58-265
No. 89 and Japanese Utility Model Application Laid-Open No. 58-26577, there are known those having an eraser or other writing instrument at the rear end portion of the barrel. Also, as a conventional example, a double-type writing instrument in which another article such as an eraser or other writing instrument is replaceably provided at the rear end portion of a shaft cylinder is known by the same applicant in Japanese Utility Model Publication No. 2-28077.

[0003]

However, the conventional example disclosed in Japanese Utility Model Publication No. 28077/1990 has a problem that the structure is complicated and the number of parts is large and cannot be provided at low cost.
Further, since the cap is long with respect to the front shaft, there is a problem that the front end and the rear end of the shaft cylinder are gripped for a rotating operation and the appearance is bad. The present invention aims to solve the above problems, and two types of eraser feeding sides can be exchanged with respect to the writing instrument side so that user-friendliness can be selected according to preference, and the lead can be replenished from the rear end to the lead housing portion. The challenge is to be

[0004]

In order to solve the above-mentioned problems, the compound writing instrument of the present invention comprises a guide part which is fixed to the front end of the front shaft and the front end of the center shaft so that they cannot rotate relative to each other and does not come off. The cursive body is fitted in the plurality of guide grooves so as to be movable back and forth by urging return springs between the center shaft and the sliding piece, and a cam slope that is displaced in the axial direction is provided at the front end in a circular shape. The cylindrical cam is rotatably prevented from moving relative to the guide part or the center shaft, and the sliding cams are brought into contact with the inclined surface of the cam to alternately move the cylinder cam relative to the center shaft back and forth to move the tip of each cursive body. A front writing part that can be selectively retracted from the tip opening of the front shaft, and a double-sided writing tool that can retract an eraser at the rear part, one type is a rear part of the cylindrical cam with the rear shaft being removable and integrated. Fixed to the rear shaft, and projecting from the rear inner hole of the rear shaft against the rear shaft. An eraser feeding device that allows the eraser to appear and disappear by rotating the rear end of the eraser is provided. Then, the eraser can be moved back and forth by the rotation of the spiral groove with respect to the slit.

In the second type, a rear shaft is detachably and integrally fixed to the rear of the cylindrical cam, a slit is formed in the side surface of the rear shaft, and protrusions and grooves are alternately formed on the inner surface of the slit. The slider is provided with an engaging portion, and an eraser is attached to the rear of the slider, and an engaging protrusion provided on the outer periphery of the slider is detachably provided in the engaging portion groove of the slit, so that the slider is attached to the rear shaft. By moving it back and forth, the eraser can be retracted from the rear end of the rear shaft.

[0006]

1 to 6 show an embodiment of the present invention. FIG. 1 shows one type of compound writing instrument, and FIG. 6 shows two types of compound writing instrument. First, one type of double-sided writing instrument of the present invention is a writing instrument such as a center shaft 1 having a guide tube 2 integrally, a tip shaft 3, a cylindrical cam 5, a pair of sliding pieces 6, 6 ', a mechanical pencil writing body 7, a ballpoint pen. The body 8 is a main component of the rear shaft 4 provided with an eraser feeding mechanism. First, the center shaft 1 is made of resin, and as shown in the figure, a guide groove 9 that is long in the axial direction and opens in the side surface from approximately the central portion to the rear end, and a guide groove 9 ″ that is similar to the guide groove 9 ″ on the opposite side surface. A cylinder 2 is provided. Guide tube 2
In the first half of the hole, holes 31 and 3 are connected to the guide grooves 9 and 9 '.
A cylindrical portion 10 having a partition 16 having a width of 1 "and having a front end opened is provided, and a rear end of the cylindrical portion 10 has a step portion 30. A joint portion 13 is formed.

Further, as shown in FIG. 3, on the rear side surface of the center shaft 1, a vertical groove 18 is connected to a peripheral groove 19 through a front inclined surface 60, and a narrow portion 61 is connected to the circumferential groove 19 to form a substantially L-shaped window portion. Has been drilled. Further, as will be described later, the protrusion 17 of the cylindrical cam 5 is inserted from the vertical groove 18, and the protrusion 17 elastically expands the inclined surface 60, passes through the narrow portion 61, and enters the circumferential groove 19. The cylindrical cam 5 rotates while the projection 17 abuts on the rear wall of the circumferential groove 19 in the circumferential direction, so that the writing part of the writing body 8 such as the mechanical pencil 7 or the ballpoint pen alternately protrudes and retracts from the front end of the front shaft. Become. Further, the circumferential groove 19 is provided with a wide groove 62 so that the cylindrical cam 5 can be axially moved at the position of the projection 17 when the mechanical pencil writing body 7 projects, and when the writing body is stored or the writing body 8 such as a ballpoint pen is used. The rear wall 64 of the circumferential groove 19 so that the cylindrical cam 5 cannot substantially move along the axis at the position of the protrusion 17 when protruding.
An inclined surface 64b is connected between a and the rear wall 64c to form a narrow groove 63. Further, as will be described later, the wall 20 of the rear shaft 4 comes into contact with the rear end of the center shaft 1 at the front end of the axial transition, and the projection 17
Is set so that the front end thereof does not contact the front wall 65 of the circumferential groove 19.

The front end of the front shaft 3 is tapered, and the front end of the inner hole has an inner step portion 26. In the rear end hole, an engagement groove 12 is provided, which engages with an engagement portion 13 provided on the outer peripheral portion of the cylindrical portion 10 of the guide cylinder, and prevents the cylindrical portion 10 from slipping out and rotating. . The cylindrical portion 10 and the front shaft 3 are detachably fixed by an appropriate force. (Showa 6
(Same as the configuration of the front shaft in JP-A-4-3491)

The rear shaft 4 is made of resin and has a shaft cylinder portion of a slightly larger diameter, and a clip 44 is provided on the rear end side surface of the shaft cylinder portion. In addition, a vertical groove 38a and a ridge 3 for detachably fixing to the rear outer peripheral portion of the cylindrical cam 5 on the peripheral surface of the inner hole 38 on the front side.
9 are formed. Further, the cylindrical cam 5 has a cylindrical shape and has a cam slant surface 14 which is circumferentially displaced forward and backward at a front end edge thereof, and a notch 15 is formed at a front end portion of the cam slant surface 14.
Further, on the side surface of the cylindrical cam 5, the cylindrical cam 5 is inserted into the vertical groove 18 of the center shaft 1 and elastically fitted into the circumferential groove 19 so as to have a predetermined range (approximately 18).
The protrusion 17 is formed so as to rotate and prevent it from coming off at 0 degrees. Further, a vertical rib 37 is provided on the rear outer peripheral portion of the cylindrical cam 5.
a, the circumferential groove 37 is formed, and the groove 38a of the rear shaft 4 is formed.
The rib 37a is engaged with the rib 37a, and the groove 37 is engaged with the ridge 39 so that they are fixed to each other. Not limited to the above relationship, the grooves, ribs, and ridges between them are appropriately provided for design convenience.

The sliding piece 6 made of resin has a protrusion 20 on the outer surface, and a central portion projects from the rear end face of the protrusion 20 and both sides thereof have substantially the same slope as the cam slope 14 of the cylindrical cam 5 described above. It has a cam slope. In addition, the flange portion 2 of the core pipe 21
A hole is provided that abuts on the second pipe 2 and projects and fits behind the core pipe 21 for a long time. A tail plug 23 is fixed to the rear end hole of the core pipe 21, and a hole 24 through which one core can be inserted is provided. Sliding piece 6'is like projection 2 as sliding piece 6
It has 0 "and a cam slope, and a writing instrument such as a ballpoint pen at the tip 8
A locking portion 25 for fixing the rear end is provided. 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 writing body 7 contains a general chuck mechanism, and is joined to the core pipe 21 through a joint 28 connected to the chuck mechanism at the rear end thereof.
Of the core pipe 21 protruding from the rear end of the sliding piece 6 by abutting on the flange portion 22 provided at the rear of the sliding piece 6
The tail plug 23 is fixed to the rear end hole as described above. The lead out is the step 2 at the tip of the mechanical pencil cursive body 7.
This is performed by sliding the chuck by the axial transition of the sliding piece 6 in conjunction with the cylindrical cam 5 in a state in which 7 is in contact with the inner step portion 26 of the leading shaft 3.

In this state, when the rear shaft 4 is rotated to one side with respect to the center shaft 1, the return spring 29 is pressed to move the sliding piece 6 forward so that the notch 15 at the front end of the cam slope 14 of the cylindrical cam 5 is removed. One of the mechanical pencil writing bodies 7 is engaged with the projection 20 of the sliding piece 6 so that the writing tip portion is projected from the tip end opening. When the rear shaft 4 is rotated to the other side with respect to the center shaft 1, the sliding piece 6 is retracted, the writing tip of the mechanical pencil writing body 7 is retracted from the tip end opening of the leading pencil, and the return spring 29 'is pressed to slide. The moving piece 6 ′ moves forward, and the writing tip of the writing body 8 such as the other ballpoint pen projects from the tip of the leading shaft.

A step portion 40 is provided at the rear end of the inner hole 38 of the rear shaft 4, and a cylindrical shaft portion 41 is integrally extended behind the step portion 40 toward the rear end. A protrusion locking portion 42 is provided on the portion, and a slit 43 is formed by hanging from the outer periphery of the rear portion in the axial direction to the rear end, while a spiral groove 34 is formed on the inner peripheral surface of the cylindrical portion 33. The front end of the rear end portion 32a is the rear shaft 4 with the cylinder 32 fitted on the outer periphery of the shaft portion 41.
The circumferential locking groove 35 provided on the inner circumference of the tip end opening of the cylindrical portion 33 while abutting on the rear end of the cylindrical portion 33 has a locking portion 4 of the shaft portion 41.
The inner cylinder 32 is locked to the rear shaft 4 so as to be rotatable only by engaging with the second shaft 2.

A slider 45 having an eraser 51 sandwiched in the shaft 41 and a protrusion 47 on its side is fitted in the shaft 41, the protrusion 47 penetrates the slit 43, and is further engaged with the spiral groove 34. The eraser 51 is rotated by rotating the rear end portion 32a of the inner cylinder with respect to the rear shaft 4.
It is possible to retract from the rear end hole of 2.

By the way, in the above embodiment, the center shaft 1 and the guide cylinder 2 are integrally formed, but they may be formed separately. 4 and 5, the protrusion 17 of the cylindrical cam 5 is elastically fitted along the guide groove 70 of the center shaft 1 "to the peripheral groove 71 formed in the peripheral surface of the center shaft, and the cylindrical cam 5 The present invention shows another example in which the shaft is prevented from slipping off with respect to the center shaft 1'and rotates within a certain range, and the above-mentioned means can be incorporated into the above-mentioned embodiment by design.

Next, regarding two types of compound writing instruments, the first half is the same as above, and the differences will be described below. As shown in FIG. 6, the rear shaft 80 is detachably and integrally fixed to the rear of the cylindrical cam 87, a slit 84 is formed in the side surface of the rear shaft 80, and a protrusion 85 is formed on the inner surface of the slit 84.
And a groove 86 are alternately formed, and a slider 90 having an eraser 94 fixed to the rear is engaged with an engaging protrusion 93 provided on the outer periphery of the slider 90 in the engaging portion groove 86 of the slit 84. It is characterized in that the eraser 94 is detachably provided so that the slider 90 can be moved back and forth with respect to the rear shaft 80 so that the eraser 94 can be retracted from the rear end of the rear shaft 80.

Further, the rear shaft 80 is a rear end portion 88 of the cylindrical cam 87.
The protrusions 83 provided on the inner surface of the inner hole of the rear shaft are disengaged and fixed in the grooves 89 provided at appropriate places on the outer periphery of the single writing instrument described above. Is shown. However, it can be done in common, and
Various types can be used with good compatibility according to user preference.

[0018]

When the rear shaft 4 is rotated to one side with respect to the front shaft 3 or the center shaft 1, the notch 15 provided at the tip of the cam slope 14 of the cylindrical cam 5 has one mechanical pencil writing body 7 as shown in FIG. It engages with the sliding piece 6 and its writing tip is projected from the tip end opening of the tip shaft. At this time, the protrusion 17 of the cylindrical cam 5 is the central shaft 1
The circumferential groove 19 is located in the wide groove 62. In this state, the rear end portion 32a of the inner cylinder 32 is knocked and the rear shaft 4, that is, the cylindrical cam 5 is axially moved.
1. The force is transmitted to the mechanical pencil writing body 7, and from the state in which the step portion 27 of the writing tip portion is in contact with the inner step portion 26 of the tip shaft 3, the chuck 28 axially shifts together with the joint 28, and the lead is extended. Further, when the rear shaft 4 is rotated to the other side with respect to the front shaft 3 or the center shaft 1, the mechanical pencil writing body 7 is retracted, and instead, the writing tip portion of the writing body 8 such as a ballpoint pen projects from the leading tip end opening. When the cursive body is stored or when the cursive body 8 such as a ballpoint pen is projected, the protrusion 17 is located in the narrow groove 63 of the circumferential groove 19 and knocked to the rear end of the center shaft 1 and the step portion of the rear shaft 4. 40a
When the protrusion 17 is provided in such a size that the protrusion 17 does not contact the front wall 65 of the circumferential groove 19 when it is in contact with, it is possible to prevent the protrusion or the like from being destroyed.

In the case of one type, the inner cylinder 32 is attached to the rear shaft 4.
When the rear end portion 32a is rotated, the slider 45 moves back and forth, and the eraser 51 appears and disappears from the rear end hole of the inner cylinder 32.
In the case of two types, the eraser from the rear end is obtained by sliding the operation button 92 interlocking with the engaging protrusion 93 of the slider 90 engaging with the engaging portion of the slit 84 with respect to the rear shaft 80 while sliding it back and forth. 94 appears and disappears. Further, the lead is replenished by inserting the lead through the hole 24 of the tail plug 23 fixed to the rear end of the lead pipe 21, but a structure for preventing lead leakage or a detachable rear end closed tail plug. It is also possible to provide.

[0020]

As described above, there are problems that the structure of the conventional example is complicated and the number of parts is large and cannot be provided at a low cost, and that the cap is long with respect to the leading shaft and the rotating operation is performed by grasping the front end and the rear end of the barrel. The poor appearance is solved. Also, two types of eraser feeding sides can be exchanged with respect to the writing instrument side, and the user-friendliness can be selected as desired. Also, the lead can be replenished from the rear end into the lead receiving portion, which makes the handling easier.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment (1 type) of the present invention, which is partially non-sectional.

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

FIG. 3 is an explanatory view showing a locked state of a cylindrical cam and a center shaft.

FIG. 4 is an explanatory view showing another example in a locked state of the cylindrical cam and the center shaft.

5 is a cross-sectional view of a main part in FIG.

FIG. 6 is an overall vertical cross-sectional view showing an embodiment (two kinds) of the present invention, which is partially non-cross-sectional.

[Explanation of symbols]

 1 Middle shaft 1'Middle shaft 2 Guide cylinder 3 Front shaft 4 Rear shaft 5 Cylindrical cam 6 Sliding piece 6'Sliding piece 7 Mechanical pencil writing body 8 Writing material such as ballpoint pen 9 Guide groove 9'Guide groove 10 Cylindrical part 11 Knock spring 12 Engagement groove 13 Engagement portion 14 Cam slope 15 Notch 16 Partition portion 17 Protrusion 18 Vertical groove 19 Circumferential groove 20 Protrusion 20 "Protrusion 21 Core pipe 22 Flange portion 23 Tail plug 24 Hole 25 Locking portion 26 Inner step portion 27 Step portion 28 joint 29 return spring 29 'return spring 30 step 31 hole 31' hole 32 inner tube 32a rear end 33 tube 34 spiral groove 35 locking groove 36 step 37 groove 37a rib 38 inner hole 38a groove 39 ridge 40 Step portion 40a Step portion 41 Shaft portion 42 Locking portion 43 Slit 43a Step portion 44 Clip 45 Slider 46 Tube portion 46 Clamping piece 47 Protrusion 48 Step portion 49 Rear end portion 50 Locking protrusion 51 Eraser 52 Rear end portion 53 Locking portion 54 Eraser 60 Sloping surface 61 Narrow portion 62 Wide groove 63 Wide groove 64a Rear wall 64b Sloping surface 64c Rear Wall 65 Front wall 70 Guide groove 71 Circumferential groove 72 Rear wall 73 Sloping surface 80 Rear shaft 81 Crown crown 82 Step 83 Lump 84 Slit 85 Protrusion 86 Groove 87 Cylindrical cam 88 Rear end 89 Groove 90 Slider 91 Elastic piece 92 Operation button 93 Engagement protrusion 94 Eraser

Claims (5)

[Claims] 1. A front end of a front shaft and a front end of a center shaft are fixed to each other in a non-rotatable and retaining state, and a cursive body is provided between a center shaft and a sliding piece in a plurality of guide grooves of a guide unit integrated with the center shaft. The return spring is urged so that it can be moved back and forth.A cylindrical cam with a cam slope that is displaced in the axial direction is provided at the front end in a circular shape so that it does not come out of rotation with respect to the guide part or center shaft, and each slide By moving the moving piece against the inclined surface of the cam, the cylindrical cam is rotated back and forth with respect to the center axis to move back and forth alternately, so that the tip of each cursive body can be selectively retracted from the tip opening of the tip axis. In a double-sided writing instrument in which an eraser can appear and disappear at the rear portion, a rear shaft is detachably and integrally fixed to the rear of the cylindrical cam, and a rear end protruding from the rear shaft in a rear inner hole of the rear shaft. Eraser can be fed out by rotating the part. A device is provided, and the eraser feeding device holds the eraser, and a slider having a protrusion on the side surface inserts the protrusion into the slit and the spiral groove, and the eraser moves back and forth by the rotation of the spiral groove with respect to the slit. A double-sided writing instrument characterized by being made in. 2. A front end of a front shaft and a front end of a center shaft are fixed to each other in a non-rotatable and retaining state, and a cursive body is respectively provided between a center shaft and a sliding piece in a plurality of guide grooves of a guide unit integrated with the center shaft. The return spring is urged so that it can be moved back and forth.A cylindrical cam with a cam slope that is displaced in the axial direction is provided at the front end in a circular shape so that it does not come out of rotation with respect to the guide part or center shaft, and each slide By moving the moving piece against the inclined surface of the cam, the cylindrical cam is rotated back and forth with respect to the center axis to move back and forth alternately, so that the tip of each cursive body can be selectively retracted from the tip opening of the tip axis. In a double-sided writing instrument in which an eraser can appear and disappear at a part, a rear shaft is detachably and integrally fixed to the rear of the cylindrical cam, and a slit is formed in a side surface of the rear shaft, and an inner surface of the slit is formed. Is provided with an engaging portion in which protrusions and grooves are alternately formed. A slider with an eraser attached to the rear is provided with an engagement protrusion provided on the outer periphery of the slider so as to be engageable with and disengageable from the engaging portion groove of the slit, and the slider is moved back and forth with respect to the rear axle to remove the eraser. A double-sided writing instrument characterized by being able to appear and disappear from the rear end. 3. A cylindrical shaft portion 41 is integrally provided in the inner hole portion of the rear shaft 4 toward the rear end, and the slit 43 extends from the substantially front end to the rear end in the axial direction of the outer peripheral portion of the shaft portion 41. On the other hand, while the inner cylinder 32 having the spiral groove 34 formed in the inner hole surface is fitted on the outer periphery of the shaft portion 41, its rear end portion 32a abuts on the rear end of the rear shaft 4 and The rear shaft 4 is rotatably locked, and a slider 45 having a projection 47 on the side surface is inserted into the shaft portion 41 by holding the eraser 51 in the forward direction. The eraser 51 is formed by penetrating and further engaging with the spiral groove 34, and the eraser 51 is rotated by rotating the rear end portion 32a of the inner cylinder with respect to the rear shaft 4.
2. The double-sided writing instrument according to claim 1, wherein the double-sided writing instrument is configured so as to be able to project and retract from the rear end hole of 2. 4. The multiple writing instrument according to claim 1 or 2, wherein at least one of the mechanical writing instruments is a mechanical pencil writing instrument, and a cylindrical cam is axially shifted with respect to a central axis so that a lead can be drawn out. 5. The multiple writing instrument according to claim 4, wherein the lead accommodating portion connected to the mechanical pencil writing instrument can be replenished with the lead from the rear end thereof.