JPH10329481A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively conduct a feeding operation of a lead by devising engagement of a knocking member. SOLUTION: In the mechanical pencil comprising a knocking member 11 for operating a lead feeding mechanism at a rear end of a barrel 1 of the pencil containing the mechanism, a lead tank 2 for storing leads is at least one requirement of the mechanism, a rear end of the tank 2 is projected from a rear end of the barrel 1, the member 11 is press-fitted in the projected part, a longitudinal rib having small inscribing diameter and a longitudinal rib having a large inscribing diameter are provided on an inner surface of the member 11. The rib having small diameter is brought into contact with the tank 2, and the rib having large diameter is brought into contact with the barrel 1 in the case of operating the member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sharpening pencil having a knock-out member at a rear end of a barrel of a sharpening pencil having a lead-in mechanism for operating the lead-out mechanism.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a sharp pencil having a knock member at the rear end of a barrel for operating the core feeding mechanism, which is described in Japanese Patent Application Laid-Open No. 6-255297. A fitting body 30 is press-fitted behind a core tank that stores a plurality of cores, which is movably disposed in the barrel, and the fitting body 30 has a rear portion that extends from the rear end of the barrel. Exposed. On the other hand, a chuck body for holding and releasing the lead is fixed in front of the lead tank, and the chuck body and the lead tank are urged rearward (in the direction of the fitting body 30) by a spring. I have.

[0003]

However, in the above-mentioned prior art, when the core is extended, the pressing operation may be performed until the springs come into close contact with each other. Would weaken the tension of And, the holding force of the core is weakened due to the decrease in the tension of the spring, and if it is strong, the core is immersed during writing, which is very troublesome and uncomfortable.
It turned into a pencil. Here, when a pressing operation is performed on the inner surface of the barrel, a step or the like to which a flange formed in front of the fitting body 30 abuts may be formed, but the barrel is formed. The mold and the like become complicated, and as a result, the mold becomes expensive and not practical.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a knock member for operating the lead-out mechanism at the rear end of a shaft cylinder of a sharp pencil having a lead-in mechanism. Wherein the lead tank for storing the lead is at least one component of the lead feeding mechanism, and the rear end of the lead tank is projected from the rear end of the barrel, and Along with press-fitting the knock member, a vertical rib having a small inscribed diameter and a vertical rib having a large inscribed diameter are provided on the inner surface of the knock member, and the vertical rib having a small inscribed diameter can be brought into contact with the core tank. In addition, the gist is that a vertical rib having a large inscribed diameter can be brought into contact with the shaft cylinder when the knock member is operated.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first example will be described with reference to FIGS. Shaft barrel 1
Inside, a wick tank 2 for storing a plurality of wicks is arranged to be able to move back and forth. A chuck body 3 for holding and releasing the core is fixed in front of the core tank 2, and a chuck ring 4 for closing and expanding the chuck body 3 is surrounded in an intermediate portion of the chuck body 3. It is attached in the state where it was set. A repellent member (chuck spring) such as a coil spring is provided between the barrel 1 and the core tank 2.
5 is provided to urge the lead tank 2 and the chuck body 3 rearward. Reference numeral 6 denotes a tip member detachably attached to the front end of the barrel 1 by screwing or the like. The tip member 6 is press-fitted with a center detent member 7 for preventing the core from retracting.

A rear portion of the core tank 2 protrudes from a rear end portion 8 of the barrel 1, and an eraser 10 is press-fitted to the inside of the protruding portion (protruding portion 9) in a detachable manner.
A knock member 11 for pressing the lead tank 2 is detachably press-fitted into the protruding portion 9 of the lead tank 2. Hereinafter, the knock member 11 will be described in detail. Behind the inner surface of the knock member 11, a short vertical rib 12 having a small inscribed diameter is provided.
And long longitudinal ribs 13 having a large inscribed diameter are formed alternately and radially. The inscribed diameter of the long vertical rib 13 having a large inscribed diameter is substantially the same as the outer diameter of the core tank 2. That is, the knock member 11 is detachably press-fitted into the protruding portion 9 of the core tank 2 by the long vertical rib 13.

Here, the front end of the short vertical rib 12 is in contact with the rear end of the core tank 2 to regulate the insertion position into the core tank 2. Further, the front end of the long vertical rib 13 can come into contact with the rear end 8 of the barrel 1 when the knocking member 11 is pressed and the lead-out operation is performed. Then, at the time of the contact, the chuck spring 5 does not completely adhere, and for example,
The chuck ring has a contraction range that allows the chuck ring to come off the chuck body and release the core. The outer peripheral cylinder portion 14 of the knock member 11 is formed up to a position covering the rear portion of the shaft cylinder 1, and is more like a cap than a knock member, and has an aesthetic appearance as a sharp pencil. In addition, the rear portion of the barrel is used as a guide to prevent the wobble (wobble) caused by the pressing operation of the knock member. . The cross-sectional shape of the short vertical ribs 12 is different from the cross-sectional shape of the long vertical ribs 13. By making the cross-sectional shape of the short vertical rib 12 substantially square, the contact area with the rear end of the core tank is increased. This is where pressure is applied when the centering operation is performed, preventing damage to the vertical ribs. Reference numeral 15 denotes a clip integrally formed with the knock member 11, but the clip 15 may be formed as a separate member and fixed to the knock member.

A second example will be described with reference to FIG. This is an example in which a vertical rib having a small inscribed diameter and a vertical rib having a large inscribed diameter are formed on the same rib. More specifically, four longitudinal ribs 17 are radially formed on the inner surface of the knock member 16, and the rear portion is a rib portion 18 having a small inscribed diameter. And a rib portion 19 having a large inscribed diameter. Of course, the front end face of the rib portion 18 having a small inscribed diameter is in contact with the rear end portion of the core tank, and the rib portion 19 having a large inscribed diameter is formed.
Is in contact with the rear end of the barrel.

A third example will be described with reference to FIG. This is an example in which the rib formation position of the second example is changed. In the second example, one of the ribs 17 is formed on the side of the clip 15, and in the third example, the rib 17 is formed. Is formed at a position away from the clip 15. Specifically, the rib 17 is formed at a position in the rotation direction of 45 degrees with respect to the clip 15 about the shaft cylinder. This is because the ease of molding, the dimensions, and the accuracy of the external shape are considered when molding the knock member by injection molding or the like, and the resin is made as easy to fill as possible. By the way, in the second example, since the clip and the rib are located at the same position, a large amount of resin must flow into that portion. ) May occur.

[0010]

According to the present invention, there is provided a sharp pencil having a knock member for actuating the lead-out mechanism at the rear end of a shaft barrel of the sharp pencil having a lead-in mechanism. At least one component of the lead-out mechanism is provided, and the rear end of the lead tank is made to protrude from the rear end of the barrel, and the knock member is press-fitted into the protruding part, and the inner surface of the knock member is A vertical rib having a small diameter and a vertical rib having a large inscribed diameter are provided so that the vertical rib having a small inscribed diameter can be brought into contact with the core tank. When the member is operated, it can be brought into contact with the barrel, so that good writing can be performed over a long period of time, and the product can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first example of the present invention.

FIG. 2 is a longitudinal sectional view showing a knock member of the present invention.

FIG. 3 is a bottom view of the knock member of the present invention.

FIG. 4 is a longitudinal sectional view showing a knock member of a second example.

FIG. 5 is a bottom view showing a knock member according to a third example.

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 2 core tank 3 chuck body 4 chuck ring 5 chuck spring 6 tip member 7 core detent member 8 rear end 9 protruding part 10 eraser 11 knock member 12 short vertical rib 13 long vertical rib 14 outer peripheral cylinder 15 clip 16 Knock member 17 Vertical rib 18 Rib with small inscribed diameter 19 Rib with large inscribed diameter

Claims (1)

[Claims] 1. A sharp pencil having a knock member for operating said lead-out mechanism at a rear end of a shaft barrel of a sharp pencil having a lead-in mechanism built therein, wherein at least said lead tank for storing lead is fed out. The rear end of the core tank is made to protrude from the rear end of the barrel, and the knocking member is press-fitted into the protruding portion, and the inner surface of the knocking member has a small inscribed diameter. A rib and a vertical rib having a large inscribed diameter are provided, and the vertical rib having a small inscribed diameter can be brought into contact with the core tank, and the vertical rib having a large inscribed diameter is operated by the knock member. A sharp pencil characterized in that it can be brought into contact with the barrel.