JPH0239833Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a rotary type that stores two ballpoint pens, for example, a sharp pencil and a ballpoint pen, on one shaft and can switch between them as needed by rotating the shaft.
Concerning the improvement of colored writing instruments.

Conventionally, the cap was rotated 360 degrees with respect to the tip shaft.
A so-called one-way rotary three-color ballpoint pen is known, in which three ballpoint pens appear, protrude, and retract every 120 degrees of rotation.
The positioning when protruding the writing instrument is ambiguous,
If the rotational operation is not adjusted intuitively, the position setting will be over, which causes troubles such as having to set it again. Moreover, since the position setting adjustment operation is one-way, there is the inconvenience of having to make an additional rotation. There are also configurations that allow left and right rotation instead of one-way, but the ambiguity of positioning remains the same.

By the way, in the case of a two-color writing instrument, when the writing instrument is protruded from the tip of the shaft, rotation is prevented at a predetermined angle to the left or right, so positioning is ensured, and the operation for switching between writing instruments is made clear. It is known that

The present invention was devised in view of the above circumstances, and is constructed as follows.

A sliding piece is fixed to the back end of the three cursive letters, and the three
The three writing bodies are fitted into a guide cylinder having two sliding grooves through the sliding pieces so as to be slidable in the axial direction, and a cylindrical cam having a circumferential cam slope on the front surface is attached to the guide tube. It is attached to the outer periphery of the guide cylinder so that it can rotate within an angular range of about 240 degrees, and a collar part and a step-like stop part are provided between the cylindrical cam and the guide cylinder to prevent the cylindrical cam from moving against the guide cylinder. Rotation is prevented by bringing the collar into contact with a step-shaped stop at a position of approximately 120 degrees within the angular range, and the inhibition is released by appropriately moving the axis of the cylindrical cam relative to the guide cylinder, By rotating the cylindrical cam, the sliding piece is made to slide on the cam slope, and the three writing pieces are alternately reciprocated and retracted from the tip hole of the tip shaft.

It is an object of the present invention to provide a rotary three-color writing instrument configured as described above, which enables reliable positioning when projecting the writing instrument.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in the drawings.

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a left side view of the guide tube, and Fig. 3 is a C of Fig. 2.
-C line sectional view, Figure 4 is a right side view of the guide tube,
5 is a sectional view taken along arrow A in FIG. 3, FIG. 6 is a sectional view taken along arrow B in FIG. 3, and FIG. FIG. 8 is a cross-sectional view of the cylindrical cam, FIG. 9 is a left side view of the cylindrical cam, and FIG. 10 is a cross-sectional view of a portion of the cylindrical cam shown in FIG. 8 when viewed from below. .

As shown in FIG. 1, there is a core pipe 3 movably attached to the sliding groove 2 of the guide tube 1.
A sliding piece 4 is fixed to the rear end of the core pipe 3. A return spring 7 is biased via a spring receiver 6 between the tip surface of the sliding piece 4 and the step 5 at the front of the guide cylinder 1, and a piece tip projection 8 of the sliding piece 4 and a cylindrical cam 9 to be described later are connected. Tip notch 1
0 is engaged. On the other hand, a sharp writing body 30 is removably fitted to the tip of the core pipe 3, and the tip of the tip 12 is connected to the tip hole of the tip shaft 13.
It stands out from 4. In addition, the guide tube 1 has a second
As shown in the figure and FIG. 3, a sliding groove 15 and a sliding groove 16 are provided at approximately 120 degrees, and a receiving pipe 17 is movably attached to each of the sliding grooves 15 and 16.
Sliding pieces 18 and 19 are fixed to the rear ends, respectively. A spring receiver 20 is provided between the tip surfaces of the sliding pieces 18 and 19 and the stepped portion 5 at the front of the guide cylinder 1.
Return springs 21 and 22 are biased via.

In the drawing, the sliding piece 19 and the return spring 22 are not shown because they are located on the back side of the sliding piece 20 and the return spring 21. The ballpoint pen 2 is inserted into the receiving pipe 17 from the tip hole.
3 and 24 are respectively fitted in a detachable manner.

On the other hand, the boss portion 25 at the rear of the guide cylinder 1 is provided with a vertical groove 26 and circumferential grooves 27, 28 (fourth
7), the collar portion 29 provided on the inner surface of the cylindrical cam 9 having a cam slope is connected to the longitudinal groove 29.
Alternatively, the cylindrical cam 9 is fitted around the guide tube 1 by fitting into the circumferential grooves 27 and 28. The cylindrical cam 9 has a collar portion 29 with respect to the guide tube 1 and a circumferential groove 27,
28 and rotates in an angular range of approximately 240 degrees, the protruding part of the sharp writing body 30 has a collar 29 located in the vertical groove 26 of the guide tube 1, and the cylindrical cam 9 is rotated against the guide tube 1. (flange position E in FIG. 7). Further, when the sharp writing body 30 is stored and the ballpoint pen 23 is extended, the collar portion 29 is located in the circumferential groove 27 and is prevented from moving in the axial direction (flange portion position F in FIG. 7).
However, the backlash, which is the difference between the width of the circumferential groove 27 and the thickness of the collar portion 29, moves. Additionally, the circumferential groove 27 is connected to the stop portion 31.
It is connected to the circumferential groove 28 via. That is, the cylindrical cam 9 has a distance of approximately 120 mm between the stop portion 32 and the stop portion 31.
Rotate degrees. Therefore, the right rotation limit (stop part 32)
At this point, the sharp writing body 30 protrudes, and at the left rotation limit (stop portion 31), the ballpoint pen 23 protrudes, and the writing body is housed in the middle.

By the way, a joint tube joint 33 is fixed to the outer circumference of the front end of the guide tube 1, and a decorative ring 34 is attached to the outer circumference of the joint tube joint 33.
is inserted, and a joint cylinder 35 is fixed in front of it. The decorative ring 34 is rotatable with respect to the joint tube joint 33, and is prevented from moving in the axial direction between the joint tube 35 and the guide tube collar portion 36. Furthermore, a rib or a bulge is provided on the outer periphery of the joining cylinder 35. A front shaft 13 is removably attached thereto. Furthermore, the decorative ring 34 is attached to the cap 3 with the cylindrical cam 9 positioned on the guide tube 1.
7 is press-fitted and fixed.

On the other hand, the cap 37 has a clip 3 on the rear outer circumference.
The lower part of the cam 8 has a guide protrusion 39 into which a guide groove 40 provided on the outer periphery of the cylindrical cam 9 is fitted. Therefore, when the cap 37 is rotated, the cylindrical cam 9 rotates integrally. However, the relationship between the guide groove 40 and the guide projection 39 is free in the axial direction, and the cylindrical cam 9 is movable in the axial direction with respect to the cap 37. Further, a crown 41 is press-fitted into the rear end hole of the cap 37, and its front end surface is in contact with the rear end surface of the cylindrical cam 9. A knock pipe 42 is fixedly fixed to the rear end hole of the cylindrical cam 9.
An eraser 43 is attached to the eraser 43, and a knob cover 44 is attached to the outer periphery of the eraser 43, and the knob cover 44 extends rearward through a hole in the crown 41 in a removable manner. Therefore, the cylindrical cam 9
When the rear end of the knock cover 44 is pressed while the collar 29 is in the circumferential groove 27 of the guide cylinder 1, the collar 29 comes into contact with the front end of the circumferential groove 27, and when the cap is rotated in this state, the collar 29 stops. It rotates without being blocked by the portion 31, and is prevented from rotating by the stop portion 45 (flange portion position G in FIG. 7). At this time, the ballpoint pen 24 protrudes from the tip hole 14 of the tip barrel 13. During this time, when the collar portion 29 passes through the stop portion 31, the ballpoint pen 23 is once projected and then retracted. Ballpoint pen 2 from the protrusion of Sharp cursive 30
The rotation range up to 4 protrusions is approximately 240 degrees.

In the above embodiment, the collar portion 29 is formed on the inner surface of the cylindrical cam 9, and the vertical groove 26 and the circumferential grooves 27, 28 are formed on the boss portion 25 at the rear portion of the guide cylinder 1.
The case where the following is provided is explained.

Next, the effect will be explained.

First, at the limit of clockwise rotation of the cap 37, the cylindrical cam 9
The collar portion 29 is blocked by the stop portion 32, and by knocking the knock cover 44, the sharp writing body 30 is knocked through the cylindrical cam 9, and the lead is fed out. Next, at the limit of left rotation, the collar portion 29 moves to the stop portion 31.
This causes the ballpoint pen 23 to protrude. Also, at this time, if the cap is rotated with the knock cover 44 knocked, the left rotation limit will be at the stop portion 4.
5 and the ballpoint pen 24 protrudes. In order to make the sharp writing body 30 protrude from this state, it is sufficient to rotate it all at once to the right. In addition, an appropriate rib may be provided at the front end portion of the circumferential groove 27 at the stop portion 31 of the guide tube 1 to allow temporary frictional engagement between the collar portion 29 of the cylindrical cam 9 and the guide tube 1 in a knocked-down state. is also possible. Thereby, when projecting the ballpoint pen 24, the operation of clicking and rotating can be divided into clicking and rotating.

FIG. 11 is a sectional view corresponding to FIG. 3 of a guide cylinder according to another embodiment of the present invention, FIG. 12 is a right side view thereof, and FIGS.
A sectional view taken along arrows A and B in the figure, and FIG. 15 is a developed view of the boss portion of the guide tube, and is an explanatory view showing the positional relationship with the collar portion of the cylindrical cam.

In this embodiment, the structure of the vertical groove 26 of the boss portion 25 of the guide tube 1 and the circumferential grooves 27 and 28 is different from the previous embodiment. The grooves 26 and 2 of the guide tube 1
The relationship between 7 and 28 and the collar 29 of the cylindrical cam 9 is basically the same as that described above, and in this case, when rotating between the stop parts 31 and 45, the ballpoint pens 23 and 2
4 protrudes and is configured so that the sharp writing body 30 protrudes when it is clicked and rotated to the right.

FIG. 16 also shows the third embodiment of the guide tube, which is another embodiment.
17 is a right side view thereof, FIG. 18 is a sectional view taken along arrow A in FIG. It is an explanatory view showing a positional relationship with a collar part.

Again, the structure of the vertical groove 26 and circumferential grooves 27 and 28 of the boss portion 25 of the guide cylinder 1 is changed. When the sharp writing body 30 is projected, the collar 29 of the cylindrical cam 9 is slightly inserted into the collar insertion window 46 of the guide tube 1 to be positioned, press the knob cover 44 to release the inserted state, and rotate the ballpoint pen 23 clockwise. The ballpoint pen 24 is configured to protrude when turned to the left.

The gist of the present invention is that the guide tube 1
It is configured so that the rotation of the cylindrical cam 9 can be changed as necessary, and the means for doing so include the circumferential groove 26 of the guide cylinder 1, as described above.
In addition to providing step-shaped stop portions 31, 32, and 45 on the guide cylinder 1, a component corresponding to the collar portion 29 is provided on the guide cylinder 1, and the component is provided with a step-like window on the side wall of the cylindrical cam 9. Of course, the parts may be opened and assembled together.

As described above, the present invention has sliding pieces 18, 4 fixed to the rear ends of three writing bodies (ballpoint pens 23, 24, sharp pen writing body 30), and three sliding grooves 2, 15, 16. The three writing bodies are fitted into the guide cylinder 1 having a circular cam slope 4 on the front surface thereof, so as to be slidable in the axial direction through the sliding pieces 18 and 4.
A cylindrical cam 9 having a cylindrical cam 7 is attached to the outer circumferential portion of the guide tube 1 so as to be rotatable in an angular range of approximately 240 degrees, and a collar portion 2 is provided between the cylindrical cam 9 and the guide tube 1.
9 and stepped stop portions 31, 32, 45 are provided,
The rotation of the cylindrical cam 9 relative to the guide cylinder 1 is stopped at a step-like stop portion 31, 3 at a position of approximately 120 degrees within the above-mentioned angle range.
2 and 45 to prevent the sliding movement, the cylindrical cam 9 is moved axially relative to the guide cylinder 1 to release the blocking, and the cylindrical cam 9 is rotated to prevent the sliding movement. Slide the pieces 18 and 4 on the cam slope 47 and reciprocate the three cursive letters alternately.
It is made to protrude and retract from the tip hole 14 of No. 3.

Therefore, positioning when protruding each writing body (ballpoint pens 23, 24, sharp pen writing body 30) can be performed reliably in the same way as with two-color writing instruments.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a left side view of the guide tube, and Fig. 3 is a C of Fig. 2.
-C line sectional view, Figure 4 is a right side view of the guide tube,
5 corresponds to a sectional view taken along arrow A in FIG. 3, FIG. 6 corresponds to a sectional view taken along arrow B in FIG. 3, and FIG. 8 is a cross-sectional view of the cylindrical cam, FIG. 9 is a left side view of the cylindrical cam, and FIG. 10 is a cross-sectional view of a part of the cylindrical cam shown in FIG. Yes, 11th
The figure is a sectional view corresponding to FIG. 3 of the guide cylinder according to another embodiment of the present invention, FIG. 12 is a right side view thereof, and FIGS. 13 and 14 are A and B in FIG. 11. 15 is a developed view of the boss portion of the guide tube and is an explanatory diagram showing the positional relationship with the collar portion of the cylindrical cam, and FIG. 16 is also a cross-sectional view of the guide tube according to another embodiment. 3 is a sectional view corresponding to FIG. 3, FIG. 17 is a right side view thereof, and FIG. 18 is a sectional view corresponding to FIG.
6 is a sectional view taken along arrow A in FIG. 6, and FIG. 19 is a developed view of the boss portion of the guide tube, and is an explanatory view showing the positional relationship with the collar portion of the cylindrical cam. 1...Guide tube, 2, 15, 16...Sliding groove,
4, 18...Sliding piece, 9...Cylindrical cam, 13...
... Tip shaft, 14 ... Tip hole, 25 ... Vertical groove, 26,
27... Circumferential groove, 29... Collar portion, 31, 32, 4
5...stop part, 47...cam slope.

Claims (1)

[Claims for Utility Model Registration] Sliding pieces 18, 4 are fixed to the rear ends of the three writing bodies 23, 24, 30, and three sliding grooves 2, 15,
The sliding pieces 18, 1 are attached to the guide tube 1 having a
The three writing bodies are fitted through the guide tubes 9 and 4 so as to be slidable in the axial direction, and a cylindrical cam 9 having a circumferential cam slope 47 on the front surface is approximately attached to the outer periphery of the guide tube 1. It is attached rotatably within an angular range of 240 degrees, and a collar portion 29 is provided between the cylindrical cam 9 and the guide tube 1.
and step-shaped stop portions 31, 32, 45 are provided, and the rotation of the cylindrical cam 9 relative to the guide tube 1 is controlled by the step-like stop portions 31, 32, 45 at a position of approximately 120 degrees within the angular range.
32, 45 by bringing the collar portion 29 into contact with the guide cylinder 1, and releasing the blocking by appropriately moving the axis of the cylindrical cam 9 with respect to the guide cylinder 1, and rotating the cylindrical cam 9 to prevent the sliding movement. A rotary three-color writing instrument characterized in that the pieces 18, 19, and 4 are slid on a cam slope 47 to cause the three writing bodies to reciprocate alternately and appear and retract from the tip hole 14 of the tip shaft 13. .