JP3095986B2 - 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 is used for writing by selectively projecting a 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 disposed in the rear shaft. The cam selectively projects a writing body at the tip of one of the refills from the tip opening of the barrel. There are many things to make.

[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 normal knock-type mechanical pencil, the knock button is always set on the shaft cylinder. If it is made to protrude from the tail end opening, knocking operation is easy, but there is a problem that luxury feeling 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.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a two-core writing instrument which has a luxurious feel, and in which the knock button protrudes from the tail end opening of the barrel only when writing with a mechanical pencil, thereby facilitating 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 projecting cam consisting of a mountain-shaped inclined edge arranged in the rear shaft selectively selects the mechanical pencil actuator and the ballpoint pen actuator that abut the tail end of the refill. And the cursive writing at the tip of one of the refills protrudes from the tip opening of the barrel,
In a two-core writing instrument that receives pen pressure by the locking part of the tip of the protruding cam being locked to the tail end of the actuator, the knock member for drawing out the pencil lead is repelled in the rearward direction with the knock member for the pencil lead. Arranged and formed at the tip of the knock member with a mountain-shaped inclined edge with a slope greater than that of the protruding cam, forming a knock cam that abuts the mechanical pencil actuator, and both refills are housed in the shaft cylinder In this case, 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 is in contact with the tail edge of the rear shaft. When the handwriting at the tip of the mechanical pencil protrudes from the tip opening of the barrel and the engaging part of the protruding cam engages with the tail end of the mechanical pencil actuator, the tip of the knock cam also uses the mechanical pencil. The tip of the knocking cam is located at the same position as the locking part of the tip of the cam, and the tip of the knocking button is separated from the tail of the rear shaft. When the cursive body protrudes from the tip opening of the barrel and the locking part of the protruding cam tip locks to the tail end of the ballpoint pen actuator, the tip of the knock cam advances forward from the tail end of the ballpoint pen actuator and the knock button Of the rear shaft abuts the tail edge of the rear shaft.

[0008]

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 the guide holes so as to be able to move back and forth. A mechanical pencil actuator 31 and a ballpoint pen actuator 32 are fitted to the tail ends of the refills 21 and 22, respectively. The refills 21 and 22 are operated by the operating spring 7.
It is bounced toward the tail end by 2. Also, Refill 21,
Reference numeral 22 has writing bodies 211 and 221 at its tip.

A projecting cam 5 is formed integrally on the inner peripheral surface of the rear shaft 11. The projecting cam 5 has an inclined edge.
As shown in the developed view, the profile is mountain-shaped, and a locking portion 51 is formed at the tip thereof. When the rear shaft 11 is rotated counterclockwise with respect to the front shaft 12, the mechanical pencil actuator 31 fitted to the mechanical pencil refill 21 advances along the profile of the protruding cam 5. Is advanced 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 mechanical pencil actuator 31 by rotating counterclockwise, the writing body 211 of the mechanical pencil refill 21 is moved from the distal end opening 13 of the barrel 1 as shown in FIG. When it protrudes, rotates clockwise and locks on the ballpoint pen actuator 32, the writing body 221 of the ballpoint pen refill 22 protrudes from the distal end opening 13 of the barrel 1. The protruding cam 5 is connected to the rear shaft 11.
Instead of being integrated with the rear shaft 11, a cylindrical projecting 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 arranged 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 protruding cam 5 and having a mountain-shaped profile is formed as shown in FIG.
The profile abuts the mechanical pencil actuator 31 together with the projecting cam 5. However, the tail end of the ballpoint pen actuator 32 is thinner than the mechanical pencil actuator 31 and is flush with the inner surface of the protruding cam 5, and the knock cam 41 does not abut the ballpoint pen actuator 32.

The slope of the knock cam 41 is larger than the slope of the protruding cam 5, and the writing bodies 211,
When both 221 are housed in the barrel 1, as shown in FIG. 2, the tip of the knock cam 41 is located a distance A ahead of the locking portion 51 which is the tip of the protruding cam 5. . Here, the distance A is the value of the mechanical pencil 2
The distance is slightly larger than the knock stroke required to extend one pencil lead.

When writing with a mechanical pencil, as described above, when the rear shaft 11 is rotated counterclockwise with respect to the front shaft 12, the mechanical actuator 31 of the mechanical pencil 31
And the writing body 211 of the mechanical pencil refill 21 projects from the distal end opening 13 of the barrel 1, and at this time, the mechanical pencil operating element 31 also advances along the profile of the knock cam 41. The resilient force of the knock spring 43 is applied to the operating spring 7.
2, the knock cam 41 alone does not act to advance the mechanical pencil actuator 31, and conversely, the mechanical pencil actuator 31 advances along the profile of the knock cam 41. A force for retracting the knock member 4 is received from the mechanical pencil actuator 31.

When the locking portion 51 at the tip of the protruding cam 5 is locked to the mechanical pencil operating element 31, the tip of the knock cam 41 is also locked to the mechanical pencil operating element 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 becomes the same position, and the knock member 4 retreats by the distance A. Therefore, as shown in FIG.
The leading edge of the knock button 42 is separated from the tail edge of the barrel 1 by a distance A to 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 ballpoint pen that does not require a knocking operation, the rear shaft 11 may be rotated clockwise with respect to the front shaft 12, and the projecting cam 5 causes the ballpoint pen actuator 32 to move forward as shown in FIG. Handwriting pen 2 of ballpoint pen refill 22
Although the protrusion 21 projects from the distal end opening 13 of the barrel 1, the knock cam 41 does not abut the ballpoint pen actuator 32,
The resilient force of the operation spring 72 does not act on the knock cam 41, and the knock cam 41 advances beyond the tail end of the ballpoint pen actuator 32. That is, even if the rear shaft 11 is rotated clockwise with respect to the front shaft 12, the knock member 4 does not retreat, and the leading edge of the knock button 42 is in contact with the tail edge of the barrel 1.

[0018]

As described above, the two-core writing instrument according to the present invention has a knocking button whose tip edge is the tail end of the barrel except when the writing body of the mechanical pencil protrudes from the tip opening 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. Also, when writing with a mechanical pencil, the knock button can be knocked away from the tail end of the barrel, so that it is possible to perform a knock operation with one hand even during writing, and the knock operation is extremely easy. is there.

[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.

FIG. 5 is a cross-sectional view of the embodiment of the present invention in a state where the writing body of the ballpoint pen refill projects from the tip end opening of the barrel.

FIG. 6 is a developed view showing the relationship between the cam and the actuator when the writing body of the ballpoint pen refill projects from the distal 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 pencil refill 22 Ball pen refill 221 Writing pen for ball pen refill 31 Mechanical pencil actuator 32 Ball pen actuator 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

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B43K 24/18 B43K 24/14 B43K 21/16

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,
Selectively advance the mechanical pencil and ballpoint pen actuators that touch the tail end of the refill, the writing body at the end of one of the refills protrudes from the tip opening of the barrel, and the locking part at the tip of the protruding cam is the actuator. In a two-core writing instrument that receives pen pressure by locking to the tail end of the knuckle, a knock member for drawing out a pencil lead is arranged in the rear shaft in a state of being ejected in the tip direction, and is attached to the tip of the knock member. , Consisting of a mountain-shaped sloped edge with a greater slope than the protruding cam, and a knock cam that abuts the mechanical pencil actuator is formed.When 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 that 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 of the pencil refill projects from the tip opening of the barrel and the locking part at the tip of the protruding cam locks to the tail end of the mechanical pencil actuator, the tip of the knock cam also engages with the tail end of the mechanical pencil actuator. Stops, the locking part at the tip of the protruding cam and the tip of the knock cam become the same position, the tip edge of the knock button is separated from the tail edge of the rear shaft and knocking is possible, and the writing body at the tip of the ballpoint pen refill is When the locking portion at the tip of the protruding cam that protrudes from the tip opening and locks to the tail end of the ballpoint pen actuator, the tip of the knock cam advances forward from the tail end of the ballpoint pen actuator and the tip edge of the knock button moves to the rear shaft. Tail end of 2 cores writing implement, characterized in that in contact with.