JP6199130B2 - Rotating multi-core writing instrument - Google Patents

Description

  The present invention has a front shaft and a rear shaft, and by rotating the front shaft with respect to the rear shaft, a writing portion accommodated in the shaft cylinder at a cam portion having a cam slope provided in the rear shaft. The present invention relates to a rotary operation type multi-core writing instrument having a structure in which a writing tip of a body projects from a tip opening of a front shaft.

  As an example of the rotary operation type multi-core writing instrument, there is a structure in which a plurality of writing bodies are accommodated in a shaft cylinder as seen in the prior art document 1 (Japanese Patent Laid-Open No. 2012-223964).

  In a general rotational operation type multi-core writing instrument, a cam provided with a cam locking projection of a sliding body disposed behind the writing body by rotating the front shaft with respect to the rear shaft. It is structured to be able to be held in a state where the writing tip of the writing body protrudes from the tip opening of the front shaft while being advanced to the cam slope of the portion and locked to the locking recess provided at the tip of the cam slope. . However, if the front shaft is rotated too much with respect to the rear shaft, the cam locking projection that slides on the cam slope will exceed the locking recess of the cam portion, so the user carefully rotates the cam. I had to.

JP 2012-223964 A

  In the present invention, when the front shaft is rotated with respect to the rear shaft and the writing tip of the writing body in the shaft cylinder is projected, the rotation operation of the structure that can perform the rotation operation without rotating the rear shaft too much. It aims at obtaining a formula multi-core writing instrument.

The present invention
“A plurality of shaft cylinders each having a front shaft and a rear shaft, the front shaft being rotated with respect to the rear shaft, and being accommodated in the shaft cylinder by a cam portion having a cam inclined surface in the rear shaft. One of the sliding bodies attached to each of the writing bodies is advanced, and the rear end top portion of the cam locking projection provided on the sliding body is inserted into the locking recess provided at the tip of the cam slope in the shaft cylinder. A rotary operation type multi-core writing instrument having a structure in which the writing tip of the writing body is maintained in a state of protruding from the tip opening of the front shaft by being locked by the elastic force of the arranged bullet.
A flat ground portion perpendicular to the shaft center is formed on both sides of the locking recess provided at the tip of the cam slope, and a flat edge extending in a direction perpendicular to the shaft center from the rear end of the cam slope in the cam portion is formed. And forming two ridges projecting forward on the flat edge and forming a flat part perpendicular to the axis between the bulges, and from the bottom of the locking recess to the flat ground. The height from the flat portion to the top of the mountain-shaped bulged portion is higher than the height to the portion, and the rear end top portion of the cam locking projection of one sliding body is the locking recess at the tip of the cam slope The rear end top of the cam locking projection of the other sliding body is locked in the center of the flat portion between the two ridge-shaped bulging portions, and the elastic body is elastic. A rotary operation type multi-core writing instrument with a structure that is emitted. Is.

  In the present invention, the rear end top of the cam locking projection of one sliding body is locked in the locking recess at the tip of the cam slope, and the rear end top of the cam locking projection of the other sliding body has two peaks. Since it is positioned at the center of the flat part between the bulging parts of the shape, when the front shaft is rotated relative to the rear shaft, the cam locking projection of one sliding body is the flat part at the tip of the cam slope Over the top of the mountain-shaped bulge and the change when the elastic body is locked to the locking recess by the elastic force of the elastic body The user can perceive the change when entering the flat portion by the elastic force of this, and it becomes easy to prevent the front shaft from turning too much with respect to the rear shaft.

  Further, in the present invention, the rear end top portion of the cam locking projection of another sliding body is in a state where the rear end top portion of the cam locking projection of one sliding body is locked to the locking recess at the tip of the cam slope. Since it is positioned at the center of the flat portion between the two ridge-shaped bulging portions, the bottom portion of the locking recess provided at the tip of the cam slope, and the flat portion between the two ridge-shaped bulging portions, However, even when it has been molded out of the designed position, the rear end top of the cam locking projection of one sliding body is locked in the locking recess at the tip of the cam slope, Since the rear end top portion of the cam locking projection of the other sliding body can be located within the flat portion between the two ridge-shaped bulging portions, the rear end of the cam locking projection of one sliding body The locking state between the top and the locking recess at the tip of the cam slope is not hindered.

  Further, in the present invention, the height from the flat part to the top of the two mountain-shaped bulged parts is higher than the height from the bottom part of the locking recess provided at the tip of the cam slope to the flat ground part. Even when the cam locking projection of one sliding body slightly exceeds the locking recess at the tip of the cam slope when the shaft is rotated with respect to the rear shaft, the cam locking projection of the other sliding body Since it is located on the inclined surface inside the two mountain-shaped bulges, the cam-engaging protrusion of the other sliding body causes the angled surface of the mountain-shaped bulged portion to be By descending, the cam locking projection of the one sliding body can be locked to the locking recess at the tip of the cam slope. In the present invention, flat ground portions are provided on both sides of the locking recess provided at the tip of the cam slope, and the rear end tops of the cam locking projections of one sliding body are located on the flat ground portions on both sides of the locking recess. In this case, the cam engaging projections of the other sliding bodies go down the inclined surfaces inside the two mountain-shaped bulges by the elastic force of the projecting bodies, thereby A force in a direction to lock the rear end top portion of the stop protrusion to a locking recess provided at the tip of the cam slope can be applied.

  From the above, according to the present invention, when the front shaft is rotated with respect to the rear shaft and the writing tip of the writing body in the shaft cylinder protrudes, the rotation operation can be performed without rotating the rear shaft too much. A rotating operation type multi-core writing instrument having a structure that can be obtained was obtained.

FIG. 1 is a longitudinal sectional view of a rotary operation type multi-core writing instrument of the present embodiment. FIG. 2 is a schematic diagram showing the positional relationship between the cam portion and the cam locking projection in a state where the writing tip of the ballpoint pen body protrudes from the tip opening. FIG. 3 is a first schematic diagram illustrating a positional relationship between the cam portion and the cam locking projection when the front shaft is rotated with respect to the rear shaft. FIG. 4 is a second schematic diagram illustrating a positional relationship between the cam portion and the cam locking projection when the front shaft is rotated with respect to the rear shaft.

Embodiments of the present invention will be described with reference to the drawings. In the embodiments, the same members and the same portions are denoted by the same reference numerals. In the description of the present embodiment, the one with the writing tip is expressed as the front, and the opposite side is expressed as the rear.
As shown in FIG. 1, the rotary operation type multi-core writing instrument 1 of this embodiment includes a front shaft 4 having a front opening 3 disposed in front of a front shaft member 2, and a tail crown 6 behind a rear shaft member 5. A sliding case 11 provided with two sliding grooves 11a for holding a ballpoint pen body 9 and a mechanical pencil body 10 in an axially symmetric position inside a shaft cylinder 8 provided with a rear shaft 7 disposed therein, and a cam portion A ball pen body 9 having a cam cylinder 12 provided with 12a and having a sliding body 13 having a cam locking projection 13a mounted in one sliding groove 11a is attached to a tip opening 8a of the shaft cylinder 8 by a coil spring 14a. The mechanical pencil body 10 with the sliding body 15 having the cam locking projections 15a attached to the other sliding groove 11a and the rear end of the shaft cylinder 8 is arranged by the coil spring 14b. It is urged to the rear side opposite to the opening 8a.

  Further, a front male screw portion 16a formed at the front portion of the connecting member 16 is screwed to a female screw portion 12b formed at the rear portion of the cam cylinder 12, and a tail crown is attached to the rear male screw portion 16b formed at the rear portion of the connecting member 16. A front female screw portion 6a formed on the front portion of the screw 6 is screwed. A flange 16c is formed on the outer periphery of the intermediate portion of the connecting member 16, and an inner portion formed on the rear shaft member 5 when the female screw portion 12b of the cam cylinder 12 and the front male screw portion 16a of the connecting member 16 are screwed together. The cam barrel 12 is fixed to the rear shaft member 5 in a non-rotatable manner by sandwiching the facing flange portion 5a. The sliding case 11 and the cam cylinder 12 form a flange portion 11c behind the small diameter portion 11b provided above the sliding case 11, and the flange portion 11c gets over the inward projection 12c formed on the inner surface of the cam cylinder 12. Thus, the sliding case 11 is rotatably connected to the cam cylinder 12. The shaft cylinder 8 is connected to the front shaft 4 and the rear shaft 7 by attaching the front of a connecting cylinder 17 whose rear side is fixed to the rear shaft 7 to the sliding case 11 to the front shaft 4.

  Referring to FIG. 1, the rotation operation of the rotary operation type multi-core writing instrument of this embodiment will be briefly described. The cam cylinder 12 has a locking recess 12e formed at the tip of the cam slope 12d of the cam portion 12a. The cam locking projections 13a of the sliding body 13 or the cam locking projections 15a of the sliding body 15 are brought into contact with the cam inclined surface 12d, and the cam locking projections 13a and 15a are cam cylinders as the sliding case 11 rotates. 12, the writing tip 9 a of the ball-point pen 9 with the sliding body 13 or the writing tip 10 a of the writing tip 10 a of the mechanical pencil body 10 with the sliding body 15 is moved along the cam slope 12 d of the shaft 8. By engaging the cam locking projection 13a of the sliding body 13 or the cam locking projection 15a of the sliding body 15 with the locking recess 12e of the cam portion 12a, While compressing pulling 14a, a 14b, and writing tip 10a of the writing tip 9a or pencil body 10 of the ballpoint pen body 9, it can be maintained in a state of protruding from the distal end opening 8a of the barrel 8.

Next, the relationship between the cam portion and the sliding body of this embodiment will be described with reference to FIG. FIG. 2 shows the positional relationship between the cam portion 12a and the sliding bodies 13, 15 in a state where the writing tip 9a of the ballpoint pen body 9 protrudes from the tip opening 8a of the shaft cylinder 8 shown in FIG. The cam locking projection 13a of the sliding body 13 mounted on the rear side of the ball pen body 9 is locked to the locking recess 12e provided at the tip of the cam slope 12d of the cam portion 12a, and the writing tip 9a of the ball-point pen body 9 extends from the tip opening 8a. It is in the state maintained in the protruding state (see FIG. 1).
The cam cylinder 12 will be described in detail with reference to FIG. 2. A locking recess 12e is provided at the tip of the cam slope 12d of the cam portion 12a. The locking recess 12e has a V-shaped bottom 121e at the rear end. It is formed. Further, a flat ground portion 12f orthogonal to the axis is formed on both sides of the locking recess 12e, and a flat edge 12g extending in a direction orthogonal to the axis is formed from the rear end of the cam slope 12d. It is. On the flat edge 12g, two ridge-shaped bulging portions 12h projecting forward are formed, and a flat portion 12i perpendicular to the axis is formed between the two bulging portions 12h. Further, the height H2 from the flat portion 12i to the top portion 12j of the mountain-shaped bulged portion is formed higher than the height H1 from the bottom portion 121e of the locking concave portion 12e to the flat ground portion 12f.

  In the rotary operation type multi-core writing instrument 1 of the present embodiment, the rear end top portion 13b formed in a pointed shape behind the cam locking projection 13a of the sliding body 13 is locked to the locking recess 12e at the tip of the cam slope 12d. In this state, the rear end top portion 15b formed in a pointed shape behind the cam locking projection 15a of the sliding body 15 is positioned on the flat portion 12g between the two mountain-shaped bulged portions 12h. When the front shaft 4 is rotated with respect to the rear shaft 7, the cam locking projection 13a of the sliding body 13 gets over the flat ground portion 12f at the tip of the cam inclined surface 12d and is locked by the elastic force of the elastic body 14a. Changes when locked to the recess 12e, and changes when the cam locking projection 15a of the sliding body 15 gets over the mountain-shaped bulged portion 12h and enters the flat portion 12g by the elastic force of the elastic body 14b. Can be felt by the user, and the front shaft 4 is prevented from being rotated too much with respect to the rear shaft 7. It could be.

  Further, in this embodiment, the rear end top portion 13b of the cam locking projection 13a of the sliding body 13 is locked to the locking recess 12e at the tip of the cam inclined surface 12d, and the rear of the cam locking projection 15a of the sliding body 15 is secured. Since the end top portion 15b is positioned at the center of the flat portion 12i between the two mountain-shaped bulged portions 12h, the V-shaped bottom portion 121e (0 of the locking recess 12e provided at the tip of the cam inclined surface 12d) Even if the position of ° and the center position (position of 180 °) of the flat part 12i between the two bulging parts 12h are deviated from the designed dimensions, the sliding body 13 In the state where the rear end top portion 13b of the cam locking projection 13a is locked to the locking recess 12e at the tip of the cam inclined surface 12d, the rear end top portion 15b of the cam locking projection 15a of the sliding body 15 has two ridges. Located within the range of the flat portion 12i between the protruding portions 12h Therefore, the locking state between the rear end top portion 13b of the cam locking projection 13a of the sliding body 13 and the locking recess 12e at the tip of the cam slope 12d was not hindered.

Further, as shown in FIG. 3, from the height H1 from the bottom 121e of the locking recess 12e provided at the tip of the cam inclined surface 12d to the flat ground portion 12f, the tops of the two mountain-shaped bulged portions 12h are formed. Since the height H2 up to 12j is formed high, when the front shaft 4 is rotated with respect to the rear shaft 7, the cam locking projection 13a of the sliding body 13 exceeds the locking recess 12e at the tip of the cam slope 12d. Even in such a case, the cam locking projection 15a of the sliding body 15 is located on the inclined surface 12k inside the two mountain-shaped bulged portions 12h. The sliding body 13 interlocked with the sliding body 15 in the rotational direction by the sliding case 11 shown in FIG. 1 by descending the inclined surface 12k of the mountain-shaped bulging portion 12h with the elastic force of 14b (arrow S1 direction). The force in the direction of arrow T1 works on The cam engaging projection 13a of the body 13 could be engaged with the engaging recess 12e of the tip of the inclined cam face 12d.
Further, as shown in FIG. 4, when the front shaft 4 is rotated with respect to the rear shaft 7, the cam locking projection 13a of the sliding body 13 does not reach the locking recess 12e at the tip of the cam inclined surface 12d. However, since the cam locking projection 15a of the sliding body 15 is located on the inclined surface 12k inside the two mountain-shaped bulging portions 12h, the cam locking projection 15a of the sliding body 15 is elasticized by the elastic body 14b. By descending the inclined surface 12k of the mountain-shaped bulged portion 12h by force (in the direction of arrow S2), the sliding case 13 shown in FIG. Due to the force, the cam locking projection 13a of the sliding body 13 could be locked to the locking recess 12e at the tip of the cam slope 12d.

1 ... Rotary operation type multi-core writing instrument,
2 ... front shaft member, 2a ... rear end, 2b ... inner surface,
3 ... front entrance, 4 ... front shaft,
5 ... rear shaft member, 5a ... buttocks,
6 ... tail crown, 6a ... front female screw part, 7 ... rear shaft,
8 ... Shaft cylinder, 8a ... Opening the tip,
9 ... ballpoint pen body, 9a ... writing tip,
10 ... mechanical pencil body, 10a ... writing tip,
11 ... sliding case, 11a ... sliding groove, 11b ... small diameter part,
11c ... Buttocks,
12 ... Cam cylinder, 12a ... Cam part, 12b ... Female screw part,
12c ... inward projection, 12d ... cam slope,
12e ... locking recess, 121e ... bottom, 12f ... flat ground,
12g ... flat edge, 12h ... bulge part, 12i ... flat part,
13 ... sliding body, 13a ... cam locking projection, 13b ... rear end top,
14a ... Coil spring, 14b ... Coil spring,
15 ... sliding body, 15a ... cam locking projection, 15b ... rear end top,
16 ... connecting member, 16a ... front male screw part, 16b ... rear male screw part,
16c ... flange,
17 ... Connecting cylinder.

Claims (1)

A shaft cylinder is provided with a front shaft and a rear shaft, and the front shaft is rotated with respect to the rear shaft, and a plurality of cams having a cam inclined surface in the rear shaft are accommodated in the shaft tube. One of the sliding bodies attached to each of the writing bodies is advanced, and the rear end top portion of the cam locking projection provided on the sliding body is disposed in the shaft cylinder in the locking recess provided at the tip of the cam slope. A rotary operation type multi-core writing instrument having a structure in which the writing tip of the writing body is maintained in a state of protruding from the tip opening of the front shaft by being locked by the elastic force of the bullet.
A flat ground portion perpendicular to the shaft center is formed on both sides of the locking recess provided at the tip of the cam slope, and a flat edge extending in a direction perpendicular to the shaft center from the rear end of the cam slope in the cam portion is formed. And forming two ridges projecting forward on the flat edge and forming a flat part perpendicular to the axis between the bulges, and from the bottom of the locking recess to the flat ground. The height from the flat portion to the top of the mountain-shaped bulged portion is higher than the height to the portion, and the rear end top portion of the cam locking projection of one sliding body is the locking recess at the tip of the cam slope The rear end top of the cam locking projection of the other sliding body is locked in the center of the flat portion between the two ridge-shaped bulging portions, and the elastic body is elastic. A rotary operation type multi-core writing instrument with a structure that is emitted.

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