JPS6111799B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a knot-type multi-color writing instrument which has a plurality of colored leads built-in and which can be set in a writing state by sequentially protruding them from a tip opening using a knob. Regarding.

The applicant of the present application has already filed an application for a knob-type multi-colored writing instrument that has a plurality of colored leads built-in and can be used for writing by protruding them sequentially from the tip opening using a knob. He has also obtained patent rights as Patent No. 869485 (see Japanese Patent Publication No. 51-47090).

However, it has been discovered that this writing instrument has drawbacks such as the inability to reduce the outer diameter of the writing instrument and the fact that the holder at the rear end of the colored lead is not stable. An outline will be explained with reference to FIGS. 1 to 7.

In the figure, 1 is the front barrel of the multicolor writing instrument, 2 is the rear barrel, and these two are screwed together to form the main body of the multicolor writing instrument (hereinafter referred to as front barrel and rear barrel). (Sometimes the two are collectively referred to as the main body without distinguishing between them.) Then, cores 3, 4, and 5 of the required number of colors are inserted into this main body, and a spring retaining ring 6, which is provided integrally within the main body, and each of the cores 3, 4, and
Joints 3a, 4a, 5 integrally connected to the rear end of 5
Springs S ₃ , S ₄ , and S _{5 are interposed between the flange portion of a and the cores 3 , 4 , and 5} to constantly urge the cores 3 , 4 , and 5 to sink into the main body. Next, a guide ring 7 is provided in the front barrel 1 integrally with the front barrel 1, and the center joints 3a, 4a, 5a are inserted into the holes of this guide ring.
so that the flange of the joint touches the guide ring 7 and stops. Further, a cam wall 2a is formed on the inner periphery of the rear shaft cylinder 2 to engage with a rotating cylinder and a pushing tool, which will be described later, and the rear end surface 2b is squeezed to prevent the pushing tool from slipping out. A rotary cylinder 8 having a receiving portion 8a at an eccentric position and two to several cam claws 8b on the periphery is fitted into the rear shaft cylinder 2, and this rotary cylinder 8 and the rear shaft cylinder 2 A pusher 9 having a chevron-shaped cam surface 9a at the front end is fitted between the rear end and the rear end. The rear end 9b of this pushing tool 9 is made thin so as to protrude to the rear of the rear barrel 2, and a cap 10 is screwed onto the rear end to integrate the rear end of the pushing tool 9 with the cap 10. A spring _S1 is interposed between the rear end surface 2b and the inner end surface of the cap 10 to constantly urge the cap 10 to protrude in the direction of arrow A, and as it retreats, the pusher 9 is urged to be pulled out to the rear of the main body. . However, this spring S ₁ is
This is not necessary depending on the shape of the chevron-shaped cam surface 9a at the front end. Further, a spring _S2 is provided between the guide ring 7 and the rotary cylinder 8, and is always biased so that the rotary cylinder 8 is pushed in the direction of arrow A. The engagement of the rotary cylinder 8 with the pusher 9 and the cam wall on the inner periphery of the main body is as shown in FIG. , E, it moves and rotates and locks in the forward position or in the backward position. As shown in FIG.
The rear end surfaces of joints 3a, 4a, and 5a of joints 4 and 5 are received in sequence, and the color can be changed by this. That is, when the cam pawl 8b of the rotary cylinder is at the position A in FIG. 5, the receiving portion 8a is at the position A in FIG. 6, which is a position to receive the joint 3a.
When the pusher 9 pushes the rotary cylinder 8 by the notch in the cap and moves forward, the rotary cylinder does not rotate along the side of the first cam wall, and the cam pawl advances in state A, and the cam pawl 8b of the rotary cylinder moves forward. At the point where the pusher is removed from the cam wall 2a on the inner periphery of the main body, the rotary cylinder rotates along the slope of the chevron at the tip of the pusher due to the action of the spring _S2 , and changes to the position B in FIG. 5. At this time, the receiving part 8a also rotates,
The position is now B compared to the position A in FIG. Next, when the knob is released, the rotary cylinder moves backward by the force pushed by the joint 3a and the elastic force of the spring _S2 , and this time the cam pawl 8b of the rotary cylinder is attached to the first cam wall 2a on the inner periphery of the main body. It rotates along the slope of the tip until it hits the protrusion 2c, and stops at position c in FIG. 5. At this time, the receiving portion is in the position shown in FIG. 6C. In this state, the rotating barrel is locked in the forward position, and the center core 3 is supported in the writing position by the receiving part 8a of the rotating barrel by the joint 3a, but the center cores 4 and 5 are at this time 8
Since it does not rest on the surface a, it remains housed in the main body by the action of springs S ₄ and S ₅ . FIG. 1 shows the state of writing with the core 3 thus constructed. Next, when the knob is clicked, the state shown in Fig. 2 will be obtained, but the rotary cylinder is pushed and rotated by the chevron-shaped slope at the tip of the pushing tool, and comes to position D in Fig. 5, so that the rotary cylinder 8
The state is also shown in FIG. 6D. Next, when the knob is released, the rotating cylinder is pushed by the force of the joint 3a and the spring S ₂
Due to the elastic force of , it retreats along the right side of the cam wall 2a and comes to position E in FIG. At this time, the core is housed in the overall body as shown in Fig. 3, and the rotating cylinder moves back even after the joint 3a is stopped due to the elastic force of the spring _S2 , and rotates as shown in Fig. 6E. Therefore, at the time of the next notch, the receiving portion 8a will push the joint 4a of the core 4, and by repeating this kind of notching, the color will be sequentially changed. Fig. 7 shows an example of a different shape of the front end of the pusher, and its operation follows the paths A, B, C, D, and EE indicated by arrows, and according to this shape. Since the rotary cylinder can press the pushing tool while rotating during the backward movement and go over the mountain of the pushing tool, the spring _S1 can be omitted.

In addition, although the above-mentioned illustrated example employs a general type of rotary cylinder 8, pusher 9, and cam wall 2a, in implementation, other types are not shown, but those of this type of general type are used. can be used as appropriate. According to the above-mentioned structure, first, when writing with the center core 3 in the state shown in FIG. Rotate to the position shown in Figure 6D. Then, when the lock is released, all the colors are contained within the main body as shown in FIG. 3, and the rotary tube is moved away from the joint 3a by the action of the spring _S2 and then rotated to the position shown in FIG. 6E. That is, the receiving portion 8a of the rotary cylinder changes from a state in which it received the joint 3a of the core 3 to a state in which it receives the joint 4a in the core 4. When the knob is clicked, the rotary tube 8 moves forward and the rotary tube 8 receives the rear end of the joint 4a, and when the knob is released, it becomes possible to write using the center core 4.

However, the method shown above has the following drawbacks. First, since the receiving portion 8a is provided inside the hollow rotary tube 8 and the rear end of the spring S2 is received near the outer periphery of the rotary tube ₈ , the rotary tube 8 is inevitably quite large. As a result, the outside diameter of the writing instrument must also be quite large. Furthermore, if the receiving portion 8a of the rotary tube 8 is located at an eccentric position, and the rotary tube 8
Since there is no means to prevent the tip from tilting, when the rear end of one of the cores 3, 4, and 5 is received by the receiving portion 8a, the receiving portion 8a tends to be inclined and cannot be stably received. may come off.

An object of the present invention is to provide a knob type multicolor writing instrument that eliminates the above-mentioned drawbacks of the invention of Patent No. 869485.

Embodiments of the present invention will be described below with reference to FIGS. 8 to 10, and the same reference numerals will be used for the same parts as those in FIGS. 1 to 7.

Fig. 8A shows the two-color built-in state of the present invention, and Fig. 8B shows the one-color writing state, where 1 is the front barrel;
2 is a rear shaft cylinder (hereinafter, without distinguishing between the front shaft cylinder and the rear shaft cylinder, both will be collectively referred to as the main body).
A spring stop ring 6 and a guide ring 7 are integrally provided within this main body. As shown in Fig. 10, the two may be formed integrally through a joint plate in the center, or, although not shown, they may be formed integrally by making two through holes in a cylindrical object. good. A disk 12 is fixed to the guide ring 7 in contact with the rear of the guide ring 7, but this disk 12 has two holes of the same size and at the same position as the two holes drilled in the guide ring 7. . At the rear of the disc 12, a guide rod 12a is provided protruding from the center. Guide ring 7
The spring stopper ring 6, the guide ring 7, the disk 12, and the guide rod 12a may be formed integrally.

The main body accommodates two cores 3 and 4 of different colors, and the cores 3 and 4 are detachably inserted and supported in holding tubes 3b and 4b. Holding tubes 3b, 4b
is inserted into the spring retaining ring 6, and built-in springs S ₃ and S ₄ are fitted between the collar at the rear end and the spring retaining ring 6, so that the cores 3 and 4 are always energized so as to be recessed into the main body. ing. Holding tubes 3b, 4
The brim portion of b hits the guide ring 7 and stops. Joints 3a, 4a are provided at the rear ends of the holding tubes 3b, 4b.
The joints 3a and 4a are connected to the guide ring 7.
and protrudes rearward through two holes in the disc 12. The flanges of the holding tubes 3b and 4b may be provided at the front end of the joint, or the holding tubes 3b and 4b may be omitted and the cores 3 and 4 may be directly and detachably connected to the joints 3a and 4a, respectively. It's okay.

A separation spring S _{2 is fitted to the guide rod 12a, and this separation spring S 2 separates} and rotates a receiving portion 8a of the rotating cylinder 8, which will be described later, from the rear end of the joints 3a and 4a when the rotating cylinder 8 retreats. play a role. As shown in FIG. 10, the rotary cylinder 8 has a cylindrical shape with an opening only at the tip, and has a receiving portion 8a protruding from a part of the outer periphery near the tip.
Two cam pawls 8b are provided at the rear, and the portion behind the cam pawls 8b is inserted into a recess in the front portion of a pusher 9, which will be described later, as is the case with most of this type of advance/retreat mechanisms. I'm stuck in it. A cam surface 9a consisting of four chevrons is formed at the front end of the pusher 9, and this cam surface 9a engages with the rear end surface of the cam pawl 8b of the rotary cylinder 8, and the cam on the inner periphery of the main body (described later) The rotary cylinder 8 is moved forward and backward or rotated by cooperation with the wall. A cam wall 2a as shown in the exploded view of FIG. 9 is formed on the inner periphery of the main body at a portion where the cam pawl 8b of the rotary cylinder 8 and the front portion of the pusher move forward and backward. Note that the rear portion of the pusher 9 is made thinner to form a knob bar 9b. By knocking the pusher 9, the cam claw 8b of the rotary cylinder 8 advances, rotates, locks, moves forward, rotates, retreats, and locks by the cam surface 9a of the pusher and the cam wall 2a on the inner periphery of the main body. The route is shown in Figure 9. The pushing tool 9 has a portion 2b formed by squeezing the rear end of the main body, so that it cannot be pulled out.

The aforementioned guide rod 12a and a spring _S2 whose front portion is fitted into the guide rod 12a are fitted into the elongated hole from the front of the rotary cylinder 8. As a result, the front part of the rotary cylinder 8 is connected to the guide rod 12.
a and spring _S2 , and the rear part is supported by the recess in the front part of the pusher 9, so it can move forward and backward without always tilting. Especially the receiving part 8
When the rear end of the core joints 3a and 4a rests on a and moves forward and backward, the rotary cylinder 8 and the receiving part 8a tend to tilt due to the force of the built-in springs _S3 and _S4 , but in this embodiment, this is not the case. Never.

In addition, windows 11a or 11b are provided at different positions in the longitudinal direction and circumferential direction of the main body as necessary to penetrate through the rear shaft cylinder and allow the change of the center core to be seen through, and a part of the rotary cylinder is opened in correspondence with this window. An identification surface is attached to the window 11a so that the identification surface appears on the window as the position changes due to the rotation and vertical movement of the rotary tube. 11b may be configured to display the color of the center core that will be in the writing state upon the next notch. This window may be fitted with flat glass or a lens, taking into account the size of the barrel and the size of the window.

The configuration and operation of the present invention have been described above as shown in FIGS. 8 and 9.
This was explained with reference to FIG.

According to the present invention, it is possible to write in different colors or to have all the colors built in just by clicking, but without tilting the rotary cylinder as described above, and by pulling the spring away from the outside of the receiving part. Since _S2 is not provided, the receiving part can be extended all the way around the main body. This means that during the process in which the receiving portion rotates while being pushed by the rear end of the core, the rear end of the core can be stably received without being removed. If the receiving part is made to the minimum necessary size,
The body can be quite slender.
Also, when multiple cores are housed in one main body,
Although a certain distance between the rear ends is required, the receiving portion of the present invention can be sized and shaped to reliably receive this distance. Since the separation spring and the guide rod can be housed in the long hole of the rotary tube 8, the mechanical part behind the guide ring can be shortened, and the overall length of the writing instrument can therefore be shortened, which has many advantages. be.

[Brief explanation of drawings]

1 to 7 of the drawings show one embodiment of the invention of Patent No. 869485. Figure 1A is a full cross-sectional view showing the state at the time of writing, Figure B is a longitudinal cross-sectional view taken along the line X-X of Figure A, and Figure C is a vertical side view taken along the Y-Y line of Figure A. The figure is a cross-sectional view showing the state when it is clicked for color change or storage, Figure 3 is a cross-sectional view showing the built-in state of all colors, Figure 4 A is a plan view of the rotary cylinder, B is a side view, and C is a side view. A plan view of the pushing tool, D is a side view thereof, and FIG. 5 is an explanation of the forward and backward mechanism using the cam pawl of the rotary cylinder with the rear shaft cylinder having a cam wall expanded, the cam surface of the pushing tool, and the cam wall on the inner periphery of the main body. FIG. 6 is an explanatory diagram of a state in which the color is changed by rotation of the rotary tube, and FIG. 7 is an explanatory diagram of a forward and backward movement mechanism of the rotary tube in another embodiment in which the shape of the pusher is different. FIG. 8 shows an embodiment of the two-color writing instrument of the present invention, and FIG.
9 shows a state in which all colors are built in, and FIG. The developed view and FIG. 10 are also component diagrams in an embodiment of the present invention. 1...Front shaft cylinder, 2...Rear shaft cylinder, 2a...Cam wall, 3, 4...Center core, 3a, 4a...Joint, 6
... Spring stop ring, 7 ... Guide ring, 8 ... Rotating tube, 8a ... Receiving part, 8b ... Cam pawl, 9 ... Pusher, 9a ... Cam surface, 9b ...
Rear end of pusher, 12a... Guide rod, S ₂ ... Separation spring, S ₃ , S ₄ ... Spring built into the core.

Claims (1)

[Claims] 1. A rotary cylinder 8, which has a receiving part 8a on a part of the outer side of the front part and a cam claw 8b on the outer periphery of the rear part, and has an elongated hole from the front to the rear, is connected to a pusher having a cam surface 9a at the front end. A cam wall 2a is disposed in front of the tool 9, and a cam wall 2a is formed on the inner periphery of the main body in the vicinity of the range in which the cam claw 8b of the rotary cylinder 8 and the cam surface 9a of the push tool 9 move forward and backward. guide rod 1 while making sure that it fits into the elongated hole of rotary cylinder 8.
2a, the front end of the guide rod 12a is fixedly attached to the main body side, and a spring S ₂ is provided on the outer periphery of the guide rod 12a to separate the rear end of the center core from the receiving part 8a of the rotary cylinder 8. A multi-color writing instrument with a locking mechanism, in which the rear part of the spring _S2 is fitted into the elongated hole of the rotary tube 8.