JP3095985B2 - 2-core writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-core writing instrument in which two refills, a mechanical pencil and a ballpoint pen, are arranged in a shaft cylinder having a front shaft and a rear shaft rotatably connected.

[0002]

2. Description of the Related Art A two-core writing instrument in which two refills, a mechanical pencil and a ballpoint pen, are arranged in a barrel, writes by selectively projecting the writing body at the tip of the refill from the tip opening of the barrel. In a two-core writing instrument, a front shaft and a rear shaft are rotatably connected, and a cam is arranged in the rear shaft, and the cam selectively causes a writing body at the tip of the refill to protrude from the tip opening of the barrel. Many.

[0003]

In such a two-core writing instrument, when writing with a mechanical pencil, it is necessary to draw out the pencil lead. However, like a conventional knock mechanical pencil, the knock button is attached to the tail of the barrel. If it protrudes from the end opening, the knocking operation is easy, but there is a problem that the sense of quality is impaired.

For this reason, a rear shaft slide type is often adopted. The rear-sliding type is one in which the front shaft and the rear shaft are rotatable and the rear shaft is connected so as to be able to move forward with respect to the front shaft. Is made to protrude from the front end opening of the barrel, the rear shaft is advanced with respect to the front shaft to perform a knocking operation, and the pencil lead is drawn out.

[0005] However, it is extremely difficult to advance the rear shaft with respect to the front shaft while holding the writing implement with one hand.
In order to extend the pencil lead, it is necessary to interrupt writing and use both hands to advance the rear shaft with respect to the front shaft, and there is a problem that the knocking operation is extremely complicated.

Accordingly, an object of the present invention is to provide a two-core writing instrument having a high-class feel and easy knocking operation.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a shaft barrel comprising a front shaft and a rear shaft rotatably connected to each other, in which two refills, a mechanical pencil and a ballpoint pen, are arranged. When the rear shaft is rotated with respect to the front shaft, a protruding cam consisting of a mountain-shaped inclined edge arranged in the rear shaft selectively advances the actuator in contact with the tail end of the refill, thereby leading the refill tip. In a two-core writing instrument that receives writing pressure by the writing body protruding from the distal end opening of the barrel and the locking portion of the protruding cam tip locking to the tail end of the actuator, a knock member for drawing out a pencil lead It is arranged in the rear shaft in a state of being repelled in the distal direction, and at the distal end thereof, a knock cam which is formed with a mountain-shaped inclined edge having a gradient greater than that of the projecting cam and which abuts the actuator is formed. Is also stored in the barrel The tip of the knock cam is located forward of the locking portion of the tip of the protruding cam, and the leading edge of the knock button that is fitted to the knock member and located outside the barrel is the tail edge of the rear shaft. When the writing body at the tip of the refill projects from the opening at the tip of the barrel and the locking part at the tip of the protruding cam locks to the tail end of the actuator, the tip of the knock cam also locks to the tail end of the actuator. The locking portion at the tip of the protruding cam and the tip of the knock cam are located at the same position, and the tip edge of the knock button is separated from the tail edge of the rear shaft so that knocking is possible.

[0008]

[Function] In other words, when the rear shaft is rotated with respect to the front shaft and the actuator is advanced by the protruding cam, the knock cam of the knocking member for feeding out the pencil lead comes into contact with the actuator, so that the protrusion is generated. At the time of completion, the tip of the knock cam engages with the actuator together with the locking portion of the protruding cam to be at the same position, but when all refills are stored in the shaft cylinder, the tip of the knock cam is the protruding cam tip. Is located forward of the locking portion, the knock member retreats by the difference when the protrusion is completed. Therefore, the leading edge of the knock button which has been in contact with the tail edge of the rear shaft is separated from the tail edge of the rear shaft and knocking is possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. In FIG. 1, a barrel 1 has a front shaft 12
And the rear shaft 11, and the front shaft 12 and the rear shaft 11
Are rotatably connected via a cylinder 7 fixed to the cylinder. Inside the barrel 1 is a mechanical pencil refill 2
Two refills, 1 and a ballpoint pen refill 22, are arranged.

The cylinder 7 has two guide holes, and a mechanical pencil refill 21 and a ballpoint pen refill 22 are accommodated in these guide holes so as to be able to move back and forth.
At the tail ends of the refills 21 and 22, the actuator 3
1, 32 are fitted. And Refill 21,
Reference numeral 22 denotes an operation spring 72 which is repelled toward the tail end.
Further, the refills 21 and 22 have the writing bodies 211 and 221 at the tips thereof, respectively.

FIG. 2 is an exploded view of the cylinder 7. The guide hole for accommodating the ballpoint pen refill 22 has a step 71.
Is formed, and the stroke of the actuator 31 housed in the guide hole in which the step is not formed is longer than the stroke of the actuator 32. This is for drawing out the pencil lead.

A projecting cam 5 is integrally formed on the inner peripheral surface of the rear shaft 11. The projecting cam 5 has an inclined edge.
As shown in FIG. 5, the profile is mountain-shaped, and a locking portion 51 is formed at the tip. And front shaft 1
When the rear shaft 11 is rotated counterclockwise with respect to 2, the operator 31 fitted to the mechanical pencil
When rotated clockwise, the actuator 32 fitted to the ballpoint pen refill 22 advances along the profile of the protruding cam 5. Then, when the locking portion 51 at the tip of the protruding cam 5 is locked to the actuator 31 by rotating counterclockwise, as shown in FIG.
1 writing body 211 projects from the distal end opening 13 of the barrel 1,
When rotated clockwise and locked to the actuator 32, the writing body 221 of the ballpoint pen refill 22 projects from the distal end opening 13 of the barrel 1. The protruding cam 5 is not integral with the rear shaft 11, and a cylindrical protruding cam may be fixed to the rear shaft 11.

In order to draw out the pencil lead of the mechanical pencil refill 21, a knock mechanism including a knock member 4, a knock button 42, a knock spring 43 and the like is arranged in the two-core writing instrument of the present invention. The knock member 4 is repelled forward by the knock spring 43, but the resilient force of the knock spring 43 is weaker than the resilient force of the operating spring 72. For example , the spring load of the knock spring 43 is 50 g, and the operating spring 72 Has a spring load of 150 g.

An eraser 44 is disposed inside the knock member 4 and a knock button 42 is fitted to the tail end of the knock member 4.
When both 1 and 221 are housed in the barrel 1, the leading edge of the knock button 42 is in contact with the tail edge of the barrel 1, as shown in FIG. Button 42 and barrel 1
Is difficult to distinguish.

At the tip of the knocking member 4, a knocking cam 41 having an inclined edge like the projecting cam 5 and having a mountain-shaped profile is formed as shown in FIG.
The profile is such that the protruding cam 5 and the actuators 31, 3
I am in opposition to 2. However, the inclination of the knock cam 41 is larger than the inclination of the protruding cam 5, and when the writing bodies 211 and 221 of the refills 21 and 22 are both housed in the barrel 1, as shown in FIG. The tip is
It is located forward by the distance A from the engaging portion 51 which is the tip of the protruding cam 5. Here, the distance A is a distance slightly larger than a knocking stroke necessary for extending the pencil lead of the mechanical pencil refill 21.

When writing with the mechanical pencil, as described above, when the rear shaft 11 is rotated counterclockwise with respect to the front shaft 12, the operator 31 advances along the profile of the protruding cam 5, and the mechanical pencil is moved. The writing body 211 of the refill 21 protrudes from the distal end opening 13 of the barrel 1, and at this time, the actuator 31 moves forward along the profile of the knock cam 41. Since the resilience of the knock spring 43 is weaker than the resilience of the operation spring 72, the force for advancing the actuator 31 by the knock cam 41 alone does not act.
Conversely, when the operating element 31 advances along the profile of the knock cam 41, the operating element 31 receives a force for retracting the knock member 4.

When the locking portion 51 at the tip of the protruding cam 5 is locked to the operator 31, the tip of the knock cam 41 is also locked to the operator 31, as shown in FIG. That is, the locking portion 51 at the tip of the protruding cam 5 and the tip of the knock cam 41 are at the same position, and the knock member 4 is retracted by the distance A. Therefore,
As shown in FIG. 3, the distal end edge of the knock button 42 is separated from the tail end edge of the barrel 1 by a distance A and can be knocked. When the knocking operation is performed, the writing body 211 is locked to the stepped portion of the distal end opening 13 of the barrel 1, and the same result as the pencil lead-out operation by the knocking of the ordinary mechanical pencil is obtained. I do.

When writing with a ball-point pen, the rear shaft 11 may be rotated clockwise with respect to the front shaft 12, but also at this time, the leading edge of the knock button 42 is distance A from the tail edge of the barrel 1. Separate. However, since the actuator 32 abuts against the stepped portion 71 formed in the guide hole for accommodating the ballpoint pen refill 22 of the cylinder 7, even if the knock button 42 is pressed, it does not advance, and the knock operation cannot be performed.

[0019]

As described above, in the two-core writing instrument of the present invention, when the writing materials of the two refills are both housed in the barrel, the leading edge of the knock button is located at the tail end of the barrel. Since it is in contact with the rim, it is difficult to distinguish the knock button and the barrel from the outside, and it is possible to give a sense of quality. In addition, when the rear shaft is rotated so that the handwriting of the refill is projected from the tip opening of the barrel, the knock button can be knocked away from the tail end of the barrel, so you can knock with one hand during writing. Can be performed, and the knocking operation is extremely easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention in which two refills of a writing body are both housed in a barrel.

FIG. 2 is an exploded view showing a relationship between a cam and an actuator when two refills are both stored in a shaft cylinder.

FIG. 3 is a cross-sectional view of the embodiment of the present invention in which the writing body of the mechanical pencil protrudes from the opening at the tip of the barrel.

FIG. 4 is a developed view showing the relationship between the cam and the actuator when the writing body of the mechanical pencil protrudes from the front end opening of the barrel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Shaft tube 11 Rear shaft 12 Front shaft 13 Tip opening of shaft tube 21 Mechanical pencil refill 211 Cursive body of mechanical pencil refill 22 Ballpoint pen refill 221 Cursive body of mechanical pen refill 31 Operator of mechanical pencil refill 32 Operator of mechanical ball refill 4 Knock Member 41 Knock cam 42 Knock button 43 Knock spring 44 Eraser 5 Projecting cam 51 Locking part 7 Cylinder 72 operating spring

Claims (1)

(57) [Claims] 1. Two refills, a mechanical pencil and a ballpoint pen, are arranged in a shaft cylinder comprising a front shaft and a rear shaft rotatably connected, and when the rear shaft is rotated with respect to the front shaft,
A projecting cam consisting of a mountain-shaped inclined edge arranged in the rear shaft,
By selectively advancing the actuator in contact with the tail end of the refill, the writing body at the tip of the refill projects from the tip opening of the barrel, and the locking portion at the tip of the protruding cam locks to the tail end of the actuator. In a two-core writing instrument that receives pen pressure, a knock member for drawing out a pencil lead is disposed in a rear shaft in a state of being repelled in a distal direction, and a mountain having a greater slope than a protruding cam is formed at the distal end of the knock member. When the knock cam that abuts the actuator is formed, and both refills are stored in the barrel,
The tip of the knock cam is located forward of the locking portion of the tip of the protruding cam, and the tip edge of the knock button which is fitted to the knock member and located outside the barrel comes into contact with the tail edge of the rear shaft. When the writing body at the tip protrudes from the opening at the tip of the barrel and the locking portion at the tip of the protruding cam locks to the tail end of the actuator, the tip of the knock cam also locks to the tail end of the actuator to protrude the cam tip. And the tip of the knock cam become the same position,
A two-core writing instrument, wherein the leading edge of the knock button is separated from the trailing edge of the rear shaft to enable knocking.