JPH10287085A - Combination writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost by reducing the number of necessary components. SOLUTION: A plurality of refills 14, 16 are housed in an outer cylinder 10, and sliders 22, 24 are coupled to rear ends of the refills 14, 16. The one slider moves forward along a cam slide surface 26a formed on an operating cam cylinder 26 in the cylinder 10 by a relative rotation between the sliders 22, 24 and the cylinder 26 to lock at a locking part 26 formed at a front end of the surfaces 26a. One spring 32 for embracing all the refills 14, 16 is provided in the cylinder 10. The spring 32 operates at the most forward sliders 22, 24 to urge the sliders 22, 24 in a direction for urging to the surface 26a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of types of mechanical pencils, for example, a plurality of mechanical pencil axes having different core diameters, a mechanical pencil axis and a ballpoint pen axis, or a mechanical pencil axis, a ballpoint axis or a rod-shaped object axis such as an eraser. The present invention relates to an improvement of a composite writing instrument having a refill and selectively projecting and retracting the refill.

[0002]

2. Description of the Related Art Conventionally, as this kind of composite writing instrument, there is one described in, for example, Japanese Patent Publication No. 6-30993.
In such a composite writing instrument, a first refill or a second refill is selectively protruded by rotating a front outer cylinder with respect to a rear outer cylinder. The sheath is guided in the axial direction by a sheath detachably connected to the outer cylinder, and a first slider and a second slider are connected to respective rear ends. The first slider and the second slider have cam surfaces formed symmetrically, respectively.
Each of the elastic members is individually biased in the retreating direction. Each of the cam surfaces is in press-contact engagement with a cam engaging projection projecting from the inner peripheral surface of the rear outer cylinder by a respective elastic body.

In the composite writing instrument constructed as described above, when the rear outer cylinder is rotated in one direction in a state where both refills are in the retracted storage position, the cam engaging projection presses and slides on the cam surface of one refill. Then, the refill protrudes to a usable position, and when the rear outer cylinder is rotated in the other direction from this state to the original position, the protruding refill is pressed against the cam engagement protrusion by the urging force of the elastic body. ,
The refill retracts to its original retracted storage position. Further, when the rear outer cylinder is rotated in the other direction from this state, the other refill projects similarly.

[0004]

However, such a conventional composite writing instrument has a problem in that it requires a large number of parts, which increases the manufacturing cost. SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an object of the present invention is to provide a composite writing instrument capable of reducing the number of necessary parts and the manufacturing cost.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of refills are stored in an outer cylinder, and a slider is connected to a rear end of each refill. One slider moves forward in the outer cylinder along a cam slide surface formed in the operation cam cylinder by a relative rotation operation with respect to the operation cam cylinder disposed in the outer cylinder. In the composite writing instrument, which can be held by a locking portion formed at the front end of the surface, and in which the tip of the refill connected to the slider can protrude from the tip of the outer cylinder, A single spring is provided surrounding the entire refill and acts on the most advanced slider to bias the slider against the cam slide surface.

According to a second aspect of the present invention, in the first aspect of the present invention, when the one slider advances in the outer cylinder, holding means for holding the remaining sliders at the retracted position is provided. It is characterized by being. According to a third aspect of the present invention, in the second aspect of the invention, the plurality of sliders cannot rotate relative to the operating cam cylinder by one slider alone. The means is an inclined groove provided along the cam slide surface of the operation cam barrel and guiding the remaining slider to the retracted position.

According to a fourth aspect of the present invention, in the invention of any one of the first to third aspects, the outer cylinder comprises:
It consists of a front outer cylinder and a rear outer cylinder detachably connected to each other, and the spring is interposed between the front outer cylinder and the slider, and is provided at the front of the inner peripheral surface of the rear outer cylinder. Is characterized in that a small projection for receiving the front end of the spring is provided at the time of assembly.

According to a fifth aspect of the present invention, a plurality of refills are housed in an outer cylinder, a slider is connected to the rear end of each refill, and the slider and an operating cam cylinder disposed in the outer cylinder are provided. , One slider advances in the outer cylinder and is locked by the locking portion of the operating cam cylinder, and the tip of the refill connected to this slider protrudes from the tip of the outer cylinder. In the composite writing instrument that can maintain the state, the plurality of sliders cannot rotate with respect to the operating cam cylinder by one slider alone, and all the sliders are attached to the operating cam cylinder. A cam groove for guiding between the forward position and the backward position is formed.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the cam groove has a locking portion for locking the slider at a forward position and a second locking portion for locking the slider at a retracted position. And two locking portions are formed. The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein a slit is formed at a rear end of the outer cylinder, and the assembling cam cylinder is provided with the slit during assembly. It is characterized by being pushed out and inserted from the rear end of the outer cylinder.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the composite writing instrument of the present invention, and FIG. 2 is II-I in FIG.
It is an I line sectional view. In this example, mechanical pencil axis 1
4 and a ballpoint pen shaft 16.

In the drawing, reference numeral 10 denotes an outer cylinder, which comprises a front outer cylinder 11 and a rear outer cylinder 12 which is detachably screwed to a rear end of the front outer cylinder 11. It has a mechanical pencil shaft 14 (refill) and a ballpoint pen shaft 16 (refill). Reference numeral 18 denotes a rubber sleeve mounted on the grip portion of the front outer cylinder 11, and reference numeral 20 denotes a clip fixed to the outer periphery of the rear outer cylinder 12.

A slider 22 and a slider 24 are connected to the rear ends of the mechanical pencil shaft 14 and the ballpoint pen shaft 16, respectively. Cam projections 22a, 24a are formed on the outer peripheral surfaces of the sliders 22, 24, respectively, and a plurality of ribs 22b, 24b extending in the axial direction are formed at intervals in the circumferential direction.
b and 24b respectively fit into a plurality of key grooves 12a formed in the rear outer cylinder 12 so that the sliders 22 and 24 cannot rotate with respect to the rear outer cylinder 12 and only in the axial direction. You will be guided to move.

The slider 22 and the slider 24 are:
Each of the cross sections has a substantially semicircular outer shape, and the two sliders 22 and 24 are combined to form a substantially circular cross section.
6 is inserted. The operating cam barrel 26 has a cam slide surface 26a formed of two mutually symmetric inclined surfaces that can be engaged with the cam protrusions 22a and 24a, respectively. At the front end of each inclined surface, the cam projection 2
A locking portion 26b for locking the locking projections 2a, 24a is formed, and the cam projections 22a, 24
An inclined groove 26c (holding means) in which a can slide along the inclined surface is formed.

The rear portion of the operating cam cylinder 26 is a reduced diameter portion 26e protruding from the rear end of the rear outer cylinder 12, and the reduced diameter portion 2e is formed.
A rubber eraser 28 is fitted into the rear end of the rubber eraser 6e.
An operation cap 30 for covering 8 is attached. The operation cap 30 has a key groove 30a formed therein, and a rib 26f formed at the rear end of the reduced diameter portion 26e is fitted into the key groove 30a, thereby preventing rotation between them. .

Sliders 22, 24 are provided between the rear end of the front outer cylinder 11 and the front ends of the sliders 22 and 24.
Of the most advanced slider among the cam slide surfaces 26a
A spring 32, which is an elastic body that urges in the direction of pressing against, is inserted. In the state of FIG.
Since the sliders 2 and 24 are retracted in the same manner, the urging force of the spring 32 acts on both the sliders 22 and 24.

When assembling such a composite writing instrument,
The operating cam barrel 2 is inserted into the rear barrel 12 from the front of the rear barrel 12.
6 and then a slider 22 to which the mechanical pencil shaft 14 is connected and a slider 24 to which the ballpoint pen shaft 16 is connected from the front of the rear outer cylinder 12. Ribs 24 a and 24 b are provided in the key groove 12 a of the rear outer cylinder 12. The relative positions in the circumferential direction are adjusted so as to be fitted, and the rear portions of the sliders 22 and 24 are moved to the operation cam cylinder 26.
Insert into. Next, the spring 32 is inserted from the front of the rear outer cylinder 12. At this time, when the spring 32 is set and the hand is released, the rear outer cylinder 12 is provided with a small protrusion 12b at the front of its inner peripheral surface so that the spring 32 does not protrude from the front of the rear outer cylinder 12. The spring 32 can be temporarily fixed in the rear outer cylinder 12 by hooking the front end of the spring 32 to the small projection 12b. After the components are set in the rear outer cylinder 12, the front outer cylinder 11 is screwed to the rear outer cylinder 12. Finally, the operation cap 30 is attached to the rear outer cylinder 12, and the assembly is completed. Incidentally, the rubber sleeve 18, the clip 20, and the eraser 28 may be appropriately attached.

The operation of the composite writing instrument configured as described above will be described. First, as shown in FIG. 1, when the mechanical pencil shaft 14 and the ball-point pen shaft 16 are retracted from the front end of the front outer cylinder 11 and housed in the front outer cylinder 11, the cams of the sliders 22 and 24 are moved. Projections 22a, 24
a is located at an intermediate point between the inclined surfaces of the cam slide surface 26a, and the sliders 22 and 24 are urged rearward by springs 32, respectively, so that the cam protrusions 22a and 24a are pressed against the cam slide surface 26a.

From this state, the operation cap 30 is attached to the outer cylinder 1.
When rotating in one direction with respect to 0, the operating cam barrel 26 rotates with respect to the rear outer barrel 12. Since the slider 22 and the slider 24 cannot rotate with respect to the rear outer cylinder 12, one of the sliders 2
In No. 4, the cam projection 24a moves forward along the cam slide surface 26a. The cam projection 24a is
When it reaches b, it is locked there and further rotation is impossible. Thus, the slider 24 moves forward, and the ball-point pen shaft 16 connected to the slider 24 is held in a state of protruding from the front end of the front outer cylinder 11 to be in a writable state (FIG. 3). The other slider 22 has a cam projection 22a with a cam slide surface 26a
Move backward along the inclined groove 26 of the operation cam barrel 26.
The inside of the inclined groove 26c is slid to reach near the end of the inclined groove 26c.

In the state where the ballpoint pen shaft 16 protrudes, the spring 32 is compressed between the rear end of the front outer cylinder 11 and the front end of the slider 24 by the advance of the slider 24, and the cam projection of the slider 24 is moved. 24a is the locking portion 26
b. On the other hand, although the slider 22 separates from the spring 32, it is irrelevant to the spring 32. However, the cam projection 22a is in the inclined groove 26c of the operation cam barrel 26, and cannot move forward and backward freely. ing. Furthermore, since the slider 22 and the slider 24 cannot rotate with respect to the rear outer cylinder 12 with respect to each other, the slider 22 cannot rotate alone. Therefore, the slider 22 and the mechanical pencil shaft 14 are stored in the rear outer cylinder 12 without backlash in a state where forward and backward movement and rotation are prohibited.

When the operation cap 30 is rotated in the opposite direction from the state shown in FIG. 3 to forcibly release the engagement between the cam projection 24a and the engagement portion 26b, the cam projection 24a moves along the cam slide surface 26a. The cam projection 22a moves forward, and returns to the state of FIG. When the rotation in the opposite direction is continued from the state shown in FIG. 1, the cam projection 22a moves forward and locks with the locking portion 26b, and the mechanical pencil shaft 1 is rotated.
4 is held in a state protruding from the front end of the front outer cylinder 11,
The cam projection 24a retreats and slides in the inclined groove 26c to reach the vicinity of its dead end.
Retreat inside. In this state, when the operation cap 30 is knocked, the operating cam barrel 26, the cam projection 22a, and the slider 22 advance, and the lead is fed out and used for use by the operation of the lead sending mechanism of the mechanical pencil shaft 14. At this time, the ballpoint pen shaft 16 also advances, but there is no problem because the ballpoint pen shaft 16 is sufficiently retracted in the outer cylinder 10. Even in this case, except when the operation cap 30 is knocked, neither the rotation nor the forward / backward movement of the slider 24 and the ballpoint pen shaft 16 is prohibited, and no rattling is the same as in the case of FIG.

In the conventional composite writing instrument, springs for urging the sliders rearward are arranged around the refill, respectively. However, in the present embodiment, one spring 32 is provided.
Need only be provided so as to surround the entire refill substantially concentrically with the outer cylinder, the number of parts can be reduced, and the manufacturing cost can be reduced. Even if only one spring is used, even if the slider that is separated from the spring at the retracted position is released from the biasing force of the spring, the slider and the refill connected to the slider are rattled because the inclined groove is provided. Nothing.

In the present embodiment, the inclined groove is provided as a means for holding the slider of the unused refill at the retracted position. However, the present invention is not limited to this. When the sliders 22 and 24 are in the state shown in FIG. It is also possible to provide holding means for engaging each other, or to provide a holding means for lightly engaging the refill tip which is retracted at the front of the front outer cylinder. If the rattling of the refill is not a concern, such a holding means can be omitted.

The replacement of the refill and the replenishment of the core can be performed by removing the screwing of the front outer cylinder 11 and the rear outer cylinder 12 as in the prior art. Next, FIGS.
Shows a composite writing instrument according to a second embodiment of the present invention. In the drawing, the same components as those in the previous embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The working cam cylinder 42 of this embodiment has a cam projection 22
A V-shaped cam groove 42a formed of two mutually symmetric inclined grooves that can be engaged with the cam grooves a and 24a is formed. A locking portion 42b for locking the cam projections 22a and 24a is formed at the front end of each inclined groove of the cam groove 42a, and the cam projections 22a and 24a are respectively formed at the rear end of each inclined groove. A second locking portion 42d for locking is formed.

A closed slit 42c is formed from the sharp portion of the V-shaped cam groove 42a.
By inserting the cam projections 22a and 24a from 2c, they can be fitted into the cam grooves 42a. In the present embodiment, the spring 32 used in the first embodiment is omitted. In the composite writing instrument thus configured, similarly to the first embodiment, the mechanical pencil shaft 14 and the ballpoint pen shaft 16 are retracted from the front end of the front outer cylinder 11 and housed in the front outer cylinder 11. 5, the cam projections 22a and 24a of the sliders 22 and 24 are located at the middle points of the inclined grooves of the cam groove 42a, as shown in FIG. Because there is no spring, each slider 22,
24 is not pressed against the working cam barrel 42, but does not rattle because the cam projections 22a and 24a are restrained in the cam grooves 42a of the working cam barrel 42.

Then, from the state of FIG.
When 0 is rotated in one direction with respect to the outer cylinder 10, the operation cam cylinder 42 rotates with respect to the rear outer cylinder 12. Slider 22
And the slider 24 is not rotatable with respect to the rear outer cylinder 12, so that one of the sliders 24 moves forward with the cam projection 24a sliding in the cam groove 42a with the rotation of the operating cam cylinder 42. Go to When the cam projection 24a reaches the locking portion 42b, it is locked there and further rotation is impossible. Thus, the slider 24 moves forward, and the ballpoint pen shaft 16 connected to the slider 24 moves the front outer cylinder 11.
Is held in a state where it protrudes from the tip of the camera, and becomes a state in which writing is possible (FIG. 6). The other slider 22 is connected to the operating cam cylinder 4
With the rotation of 2, the cam protrusion 22a slides in the cam groove 42a and moves backward, and when it reaches the second locking portion 42d, it is locked there and further rotation is impossible. Thus, the cam projections 22a and 24a are respectively engaged with the locking portions 42b.
Alternatively, by locking with the second locking portion 42d, one of the cam protrusions 22a and 24a can be reliably held in the advanced state without a spring, and any of the refills can be written. State.

In this embodiment, since the spring between the rear end of the front outer cylinder 11 and the front ends of the sliders 22 and 24 is completely unnecessary, the number of parts is further reduced, and the manufacturing cost is reduced. Can be planned. Next, FIG. 8 shows a third embodiment of the present invention, in which the same front outer cylinder 11 and rear outer cylinder 12 as in the second embodiment are used, and a three-axis refill is provided therein. Sliders 44, 46 and 48 connected to the rear end of each refill when storing
The perspective view of the operation cam cylinder 50 into which these rear parts are inserted is shown.

As shown in FIG. 9, the sliders 44, 46 and 48 have a fan shape with a central angle of 120 degrees, and the three sliders 44, 46 and 48 are combined with each other to form a substantially circular cross section. No. On the outer surfaces of the sliders 44 and 48, cam projections 44a and 48a are formed at positions close to the slider 46, and the slider 46 has a cam projection 46a formed at the center position in the circumferential direction. Have been. Further, the rib 44b, the two ribs 46b, and the rib 48b that fit into the key groove 12a of the rear outer cylinder 12 are provided with the respective sliders 4b.
4, 46, and 48 are formed at corresponding positions.

The operating cam barrel 50 has cam projections 44a,
A cam groove 50a engageable with 6a, 48a is formed. The cam groove 50a is composed of the same V-shaped portion as the V-shaped cam groove 50a of the second embodiment, and furthermore, portions extending laterally (circumferentially) from both ends of the V-shape. It extends almost 360 degrees in the circumferential direction. At the front end of the cam groove 50a, that is, at the V-shaped sharp portion, a locking portion 50b that engages with the cam projections 44a, 46a, and 48a is formed.

A closed slit 50c is formed from the V-shaped sharp portion of the cam groove 50a toward the front.
At the time of assembly, the cam projections 44a, 46
a, 48a can be inserted into the cam groove 50a. In such a configuration, the sliders 44, 46, and 48 are rotated by the operation of the operation cam barrel 50 so that any one of the cam projections 44a, 46a, and 48a engages with the locking portion 50b. As in the previous embodiment, the slider is held in the advanced state and the refill connected to the slider can be used.

By extending the cam groove 50a so as to extend to nearly 360 degrees when viewed in the circumferential direction, each cam projection 44 is extended.
a, 46a, and 48a can move the cam groove 50a by almost 180 degrees, and switching between three refills becomes possible. Next, FIG. 10 shows a fourth embodiment of the present invention. The difference between this embodiment and the first embodiment is that the clip 20 is fixed to the outer periphery of the rear outer cylinder 12. Instead, a female screw 52a is formed on the inner surface of the rear end of the rear outer cylinder 52, and a tail plug 54 formed with a male screw 54a is screwed to the female screw 52a. The clip 56 is fixed by screwing the annular portion 56 a of the clip 56 between the end and the tail plug 54.

Another difference is that the front end of the cap 30 is located in the tail plug 54. In this embodiment, it is possible to operate similarly to the previous embodiment. It is also possible to combine the structure of this embodiment with the structure of the second or third embodiment.

Next, FIGS. 11 and 12 show a fifth embodiment of the present invention. The main features of this embodiment, the first embodiment and the fourth embodiment will be described. The difference is that the connecting cylinder 64 is provided at the front of the rear
, And a front outer cylinder 61 is detachably screwed to a front end of the connection cylinder 64 so as to be detachable.
1. The outer cylinder 60 is constituted by the rear outer cylinder 6 and the connection cylinder 64. Further, the front portions of the sliders 72 and 74 extend to the connection tube 64, and a plurality of ribs 72b and 74b extending in the axial direction at the front end thereof are formed on the inner peripheral surface of the connection tube 64 at intervals in the circumferential direction. Keyway 64
a (FIG. 12), the sliders 72 and 74 are guided so as to be unrotatable with respect to the connection cylinder 64 and move only in the axial direction.

The rear portions of the sliders 72 and 74 are inserted into the operation cam barrel 76, and the sliders 72 and 74 are
Cam slide surface 76a of operating cam barrel 76, locking portion 76b
It is similar to the previous embodiment in that cam projections 72a and 74a engageable with the outer peripheral surface are provided. Further, the operating cam cylinder 76 has a rib 76c that fits into a key groove 62b formed at the rear of the rear outer cylinder 62, and is not rotatable relative to the rear outer cylinder 62.

In the above configuration, when the rear outer cylinder 62 is rotated in one direction with respect to the front outer cylinder 61, the operating cam cylinder 76 is rotated together with the rear outer cylinder 62. Sliders 72, 74
Is not rotatable with respect to the front outer cylinder 12 via the connection cylinder 64, so that one of the sliders 72 or 74 advances along the cam slide surface 76a with the rotation of the operation cam cylinder 76, Locked by locking portion 76b. Thus, the distal end of the refill connected to the slider is held in a state of protruding from the distal end of the front outer cylinder 61, and can be used as in the previous embodiment. It is also possible to combine the structure of this embodiment with the structure of the second or third embodiment.

Next, FIG. 13 shows a sixth embodiment of the present invention. The main difference between this embodiment and the first and fourth embodiments is as follows. The inner peripheral surface of the rear outer cylinder 80 has a stepped portion 80b for receiving the front end of the spring 32, and a slit 80c is formed at the rear end of the rear outer cylinder 80. This embodiment is different from the previous embodiment in that, when assembling, the operation cam barrel 26 is inserted into the rear outer cylinder 80 from behind the rear outer cylinder 80, not from the front of the rear outer cylinder 80. . When the operation cam barrel 26 is inserted, the rear end of the rear barrel 80 expands outward due to the slit 80c formed in the rear barrel 80,
The operation cam cylinder 26 can be inserted smoothly. By fixing the clip 20 from above the slit 80c of the rear outer cylinder 80 after the operation cam cylinder 26 is inserted, the slit 80c can be prevented from expanding, and the operation cam cylinder 26 can be prevented from falling off.

In this embodiment, it is possible to operate in the same manner as in the previous embodiment. It is also possible to combine the structure of this embodiment with the structure of the second or third embodiment.

[0038]

As described above, according to the first aspect of the present invention, one spring surrounding the entire refill is provided in the outer cylinder, and this spring acts on the most advanced slider. By urging the slider in the direction of pressing against the cam slide surface, the forwarded slider is urged by the locking portion of the cam slide surface and connected to this slider without providing a spring for each slider. The state in which the tip of the refill protrudes from the tip of the outer cylinder can be maintained.

Since it is not necessary to provide a spring for each of the plurality of sliders, the number of parts is reduced, and the manufacturing can be performed at low cost. According to the second aspect of the present invention,
Since the holding means for holding the remaining sliders at the retracted position is provided, the remaining sliders are held at the retracted position even when the spring does not act, so that the remaining sliders and the refill connected thereto are rattled. Nothing.

According to the third aspect of the present invention, the plurality of sliders cannot rotate with respect to the operating cam cylinder by one slider alone.
The remaining sliders cannot move independently along the cam slide surface, but are held at the retracted position by the inclined grooves. In this way, it is possible to reliably prevent rattling of the remaining slider and the refill connected thereto.

According to the fourth aspect of the present invention, when the spring is set on the rear outer cylinder at the time of assembly, the front end of the spring is hooked on the small projection of the rear outer cylinder, so that the spring is moved inside the rear outer cylinder. The spring can be prevented from protruding from the front of the rear outer cylinder until the front outer cylinder is connected to the rear outer cylinder. Thus, the assembling work can be easily performed.

According to the fifth aspect of the present invention, the plurality of sliders cannot rotate with respect to the operating cam barrel by one slider alone. Since a cam groove for guiding all sliders between the forward position and the backward position is formed, there is no need to provide an elastic body for urging the slider at all, and the number of parts is reduced, making it possible to manufacture at low cost. become able to.

According to the sixth aspect of the present invention, the slider is reliably held at the forward position and the backward position. According to the seventh aspect of the present invention, the operating cam cylinder can be assembled from the rear end of the outer cylinder.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a composite writing instrument according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a longitudinal sectional view showing a state where a ballpoint pen shaft of the composite writing instrument of FIG. 1 is projected.

FIG. 4 is a view showing sliders 22 and 24 and an operating cam cylinder 2 shown in FIG.
6 is a perspective view of FIG.

FIG. 5 is a vertical sectional view of a main part of a composite writing instrument according to a second embodiment of the present invention.

FIG. 6 is a vertical sectional view of an essential part showing a state in which one refill of FIG. 5 protrudes.

FIG. 7 is a perspective view of the operation cam barrel of FIG. 5;

FIG. 8 is a perspective view of sliders 44, 46 and 48 and an operation cam barrel 50 showing a third embodiment of the composite writing instrument according to the present invention.

9 is a view as viewed in the direction of the arrow IX in FIG. 8;

FIG. 10 is a longitudinal sectional view of a main part showing a fourth embodiment of the composite writing instrument of the present invention.

FIG. 11 is a longitudinal sectional view showing a fifth embodiment of the composite writing instrument according to the present invention.

FIG. 12 is a sectional view taken along the line XII-XII in FIG. 11;

FIG. 13 is a vertical sectional view of a main part of a composite writing instrument according to a sixth embodiment of the present invention.

[Explanation of symbols]

 10, 60 Outer cylinder 11, 61 Front outer cylinder 12, 52, 62, 80 Rear outer cylinder 12b Small protrusion 80c Slit 14, 16 Refill 22, 24, 44, 46, 48 Slider 26, 42, 50 Working cam cylinder 26b , 42b Locking portion 26c Inclined groove 42a Cam groove 42d Second locking portion 32 Spring

Claims (7)

[Claims] A plurality of refills are stored in an outer cylinder,
A slider is connected to the rear end of each of the refills, and one slider is attached to a cam slide surface formed on the operation cam cylinder by a relative rotation operation between the slider and an operation cam cylinder disposed in the outer cylinder. Along the inside of the outer cylinder, it is locked by the locking part formed at the front end of the cam slide surface of the operating cam cylinder, and the state in which the tip of the refill connected to this slider protrudes from the tip of the outer cylinder is maintained. In the composite writing instrument, a single spring surrounding the entire refill is provided in the outer cylinder, and the spring acts on the most advanced slider to press the slider against the cam slide surface. A composite writing implement characterized by vigor. 2. The composite writing instrument according to claim 1, further comprising holding means for holding the remaining slider at a retracted position when the one slider advances in the outer cylinder. 3. The plurality of sliders cannot rotate relative to the operating cam barrel by one slider alone, and the holding means extends along a cam slide surface of the operating cam barrel. 3. The composite writing implement according to claim 2, wherein the inclined writing groove is provided to guide the remaining slider to the retracted position. 4. The outer cylinder comprises a front outer cylinder and a rear outer cylinder detachably connected to each other, and the spring is interposed between the front outer cylinder and a slider. The composite writing instrument according to any one of claims 1 to 3, wherein a small projection that receives a front end of the spring at the time of assembly is provided at a front portion of an inner peripheral surface of the outer cylinder. 5. A plurality of refills are stored in an outer cylinder,
A slider is connected to the rear end of each of the refills, and a relative rotation operation between the slider and an operation cam cylinder disposed in the outer cylinder causes one slider to advance in the outer cylinder to move the operation cam cylinder. In the composite writing instrument, which is retained by the retaining portion and can maintain a state in which the distal end of the refill connected to the slider protrudes from the distal end of the outer cylinder, the plurality of sliders are operated by a single slider alone. Wherein the operating cam cylinder is formed with a cam groove for guiding all sliders between a forward position and a retracted position. Writing implement. 6. The cam groove is formed with the locking portion for locking the slider at a forward position and a second locking portion for locking the slider at a retracted position. Item 6. The composite writing instrument according to Item 5. 7. A slit is formed in a rear end of the outer cylinder, and the assembling cam cylinder is inserted from the rear end of the outer cylinder by expanding the slit when assembling. 7. The composite writing instrument according to any one of 1 to 6.