JPH07223398A - Pencil sharpener - Google Patents

Abstract

PURPOSE:To provide a pencil sharpener capable of preventing an accident in which a push rod is brought into contact with a cutting edge, damaged and broken when a knock button is pushed and the push rod is advanced to perform control so as to shorten the sharpening length of a pencil lead. CONSTITUTION:A pencil sharpener is equipped with a knock mechanism 5 which is constituted of a push rod 2, a knock button 3 for advancing or retreating the push rod 2 and a knock spring 4 or the like. The push rod 2 allows the tip of a pencil lead to abut against a pencil lead pressure equalizing plate 1 in order to change the position of the plate 1 which controls the position of the tip of the pencil lead. A linear end part 6 holding the inclination of a lead angle is provided in the rear end of the above-mentioned knock spring 4 fitted to the outer periphery of the push rod 2. The linear end part 6 of the rear end of the knock spring 6 is allowed to abut against the position of the opposite side of a cutting edge 8 in the front of a flange part 7 formed in the push rod 2 while pinching the centerline of the push rod 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pencil sharpener.

[0002]

2. Description of the Related Art Conventionally, there is a pencil sharpener capable of changing a sharpening length of a pencil lead. As an example of this kind of pencil sharpener, a lead pad for adjusting the position of the tip of the lead of the pencil, and a push rod for bringing the tip into contact with the lead pad to change the position of the lead plate, There is a structure having a knock mechanism configured by a knock button and a knock spring for moving the push rod forward or backward.

By the way, in the pencil sharpener having the above structure, in order to shorten the pencil sharpening length, the knock button is pushed to move the push rod forward. At that time, the front end of the push rod becomes the cutting edge. There is a risk of contact. Therefore, one side of the front end portion of the push rod is cut out so that the cross section has a substantially semicircular shape so as not to contact the cutting edge. However, nevertheless, the front end of the push rod came into contact with the cutting blade, was damaged, and was broken.

[0004]

In view of the above, the present invention adjusts the length of the pencil lead to be short so that when the knock button is pushed and the push rod is moved forward, the push rod moves to the cutting edge. It is an object of the present invention to provide a pencil sharpener that can prevent accidental damage and breakage due to contact.

[0005]

In order to achieve the above object, the pencil sharpener of the present invention is provided with a lead stripping plate 1 for changing the position of the lead strip 1 for adjusting the position of the tip of the pencil lead. In a pencil sharpener equipped with a push rod 2 having its tip abutted against 1, and a knock mechanism 5 including a knock button 3 for moving the push rod 2 forward or backward, a knock spring 4, etc. At the rear end of the knock spring 4 attached to the outer circumference, a wire end portion 6 for keeping the inclination of the lead angle is provided,
Attach the wire rod 6 at the rear end of the knock spring 4 to the push rod 2
It is characterized in that it is brought into contact with the position on the opposite side of the cutting blade 8 on the front surface of the flange portion 7 formed in the above, and sandwiching the center line of the push rod 2.

[0006]

[Function] When the knock button 3 is pushed to move the push rod 2 forward,
Although the knock spring 4 is compressed and the push rod 2 receives a reaction force, the both ends of the knock spring 4 are not parallel and the rear end thereof is a line end portion 6 that maintains the inclination of the lead angle. Since the push rod 2 is in contact with a position deviated from the center on the front surface of the flange portion 7 of the push rod 2, the push rod 2 receives the reaction force and is inclined, and the tip of the push rod 2 separates from the cutting edge 8 when moving forward. It moves in the direction to avoid contact with the cutting edge 8.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show only the internal mechanism with the outer casing omitted, and FIG. 1 shows a state in which the push rod 2 is retracted,
FIG. 2 shows the push rod 2 moved forward. First, in the drawing, reference numeral 9 is a rotary shaft, and this rotary shaft 9 is a manual handle 1.
It is designed to be rotated by an operation of 0, and the cutting blade 8 is attached to the rotary shaft 9 so as to be inclined like a cone. Beside the rear end of the cutting blade 8, inside the pencil insertion hole,
A core-contacting plate 1 for contacting the tip of the pencil lead is arranged, and the core-contacting plate 1 is movable in parallel with the cutting blade 8. A horizontal hole 11 is provided on the extension line of the pencil insertion hole on the rotary shaft 9 at the rear of the core contact plate 1, and a push rod 2 is inserted into the horizontal hole 11 and the push rod 2 is moved forward or backward. A knock mechanism 5 for attaching the knock mechanism is attached. This knock mechanism 5 is a so-called Khan type and is adopted in a general knock type ballpoint pen. The knock mechanism 5 and a cylindrical body 12 having a cam or groove (not shown) formed on the inner surface thereof.
And a rotor (not shown) housed inside the cylindrical body 12.
And a knock spring 4 which is attached to the outer periphery of the push rod 2 and biases the rotor and the knock button 3 rearward together with the push rod 2.

When the knock button 3 is knocked, the rotor is rotated by a certain angle and is locked at the front end of the cam provided on the inner surface of the cylindrical body 12 to maintain the forward state. When the knock button 3 is knocked next, the rotor is rotated. When the child rotates again by a certain angle to release the locked state, the force of the knock spring 4 retracts the groove. Then, the push rod 2 has its rear end brought into contact with the rotor to move forward or backward together with the rotor.

The front end of the push rod 2 comes into contact with the rear surface of the core contact plate 1, and when the push rod 2 advances, the core contact plate 1 is pushed and moves forward. There is a notch on the side surface of the push rod 2 facing the cutting edge 8 at the front end, and the cross section is substantially semicircular. As shown in FIG. 3, a flange 7 having a rectangular cross section is integrally formed in the substantially central portion of the push rod 2. The cross section of the lateral hole 11 where the collar portion 7 of the push rod 2 is inserted is also rectangular, and the push rod 2 is stopped from rotating with respect to the rotary shaft 9.

The knock spring 4 has a coil shape and is attached to the outer periphery of the push rod 2 as described above, and its rear end is in contact with the front surface of the collar portion 7. As shown in FIG. 4, the knock spring 13 used in the conventional pencil sharpener has parallel ends, but in the present invention, as shown in FIG.
A special knock spring 4 having a wire end portion 6 for keeping the inclination of the lead angle at the rear end is used. Therefore, in the knock spring 4, only the line end portion 6 at the rear end thereof comes into contact with the front surface of the flange portion 7 and only at a portion slightly deviated from the center. Then, the rear end line end portion 6 of the knock spring 4
The contact position with respect to the collar portion 7 is on the opposite side of the cutting blade 8 with the center line of the push rod 2 in between. Therefore, as shown in FIG. 2, when the knock button 3 is knocked and the push rod 2 is moved forward, the knock spring 4 is compressed and the reaction force of the knock spring 4 abuts the line end portion 6 at the collar portion 7. Since it acts only on the point, that is, the position on the opposite side of the cutting blade 8, the push rod 2 is tilted in the direction opposite to the cutting blade 8, and the front end portion of the push rod 2 moves away from the cutting blade 8 as it advances. Moving. Therefore, the contact of the push rod 2 with the cutting blade 8 is avoided, and the push rod 2 is not damaged by the cutting blade 8. Note that FIG. 6 shows the change in the posture of the push rod 2 when the push rod 2 is moved forward in an easy-to-understand manner.

[0011]

The present invention is as described above, and when the knock button 3 is pushed to move the push rod 2 forward, the push rod 2 is pushed forward in order to adjust the sharpening length of the pencil lead. Since it is possible to prevent the contact between the cutting blade 8 and the push rod 2 by inclining the front end of the push rod 2 away from the cutting blade 8, it is possible to prevent the push rod 2 from being damaged and broken by the cutting blade 8. is there.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a part of an internal mechanism, showing a state in which a push rod is retracted.

FIG. 2 is a side view showing a cross section of a part of an internal mechanism, showing a state in which a push rod has advanced.

FIG. 3 is a perspective view of a push rod and a knock spring.

FIG. 4 is a side view of a knock spring used in a conventional product.

FIG. 5 is a side view of a knock spring used in the present invention.

FIG. 6 is a cross-sectional view showing how the posture of the push rod 2 changes when the push rod 2 is moved forward.

[Explanation of symbols]

 1 Core Contact Plate 2 Push Rod 3 Knock Button 4 Knock Spring 5 Knock Mechanism 6 Line End 7 Collar 8 Cutting Edge 9 Rotating Shaft 10 Handle 11 Side Hole 12 Cylindrical Body 13 Knock Spring

Claims (1)

[Claims] 1. A push rod 2 having its tip abutted against the core contact plate 1 for changing the position of the core contact plate 1 for adjusting the position of the tip of the pencil lead, and the push rod 2 is moved forward or backward. In a pencil sharpener equipped with a knock mechanism 5 composed of a knock button 3 and a knock spring 4 and the like, a line end for keeping the lead angle inclined at the rear end of the knock spring 4 attached to the outer periphery of the push rod 2. A part 6 is provided, and the wire end 6 at the rear end of the knock spring 4 is provided on the front face of the collar part 7 formed on the push rod 2 and across the center line of the push rod 2 to form a cutting edge 8
A pencil sharpener characterized by being brought into contact with the opposite side of the.