JPH0327820Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sharp pencil, and more particularly to a sharp pencil that allows easy setting of a centering length corresponding to the moving distance of a chuck ring.

In conventional sharp pencils, the following methods are generally used to regulate the moving distance of the chuck ring, which is the centering length. For example, as shown in FIG. 1, a bent part 102 is provided at the front end of the shaft tube 101, and the front end of a chuck ring 103 is brought into contact with the inside of the bent part 102 to restrict its movement, thereby adjusting the centering length. In the case where L ₁ is set, when forming the bent portion 102, it is difficult to always bend the same dimension, and it is difficult to obtain uniform bending. Therefore, problems occurred in setting the moving distance _L1 of the chuck ring 103.
In addition, as shown in FIG.
The inner step 204 of the tip 203 is screwed onto the front part of the
In the case where the centering length _L2 is set by regulating the movement by bringing it into contact with the
Since the moving distance of the chuck ring 202 changes depending on the degree of screwing of the tip 203 to the shaft cylinder 1, it has been difficult to obtain a constant centering length.

Therefore, the present invention provides a sharp pencil in which the lead is paid out by the back and forth movement of a collet chuck which is biased rearward by an elastic member and a chuck ring that fastens the collet chuck, and in which the lead is paid out by the forward movement of the chuck ring. A hollow member is attached to the shaft cylinder, the rear end of which is regulated by an inner step of the end member disposed in contact with the shaft cylinder, and which holds the end member so as to be movable in the longitudinal direction under frictional resistance. Accordingly, it is an object of the present invention to provide a sharpening pencil in which the moving distance of a chuck ring can be easily set and a constant centering length can be obtained.

Hereinafter, the present invention will be explained in detail based on examples.

In FIG. 3, reference numeral 1 is a barrel made of resin or metal, and inside the barrel 1 there is a core storage connected to the rear part of a collect chuck 2, which has a plurality of grooves formed therein so as to have expansion ability. A tube 3 is arranged. Reference numeral 4 denotes an annular chuck ring designed to fasten the lead gripping portion 2a of the collect chuck 2. It is always biased rearward by an elastic member 6 such as a coil spring stretched between the two.

Reference numeral 7 is a tip member made of resin or metal, and at the inside front of the tip member 7 is a core detent 8 made of an elastic material such as rubber that imparts slight elasticity to the core.
However, in front of the core detent 8, metal, resin,
Core protection tubes 9 each made of a pipe-like material made of ceramic or the like are arranged. Furthermore, a stepped portion 10 for regulating the movement of the chuck ring is formed on the inner surface of the tip member 7, and a flange portion 11 is formed on the outer periphery of the rear end.

Reference numeral 12 is a hollow member made of resin or metal, and a through hole 13 having approximately the same diameter as the outer diameter of the tip member 7 is formed in the hollow member 12 so as to enclose the tip member 7. There is.

Next, a method of attaching the tip member 7 and the hollow member 12 to the shaft tube 1 will be explained with reference to FIGS. 4 and 5.

First, when inserting the tip member 7 from the rear of the hollow member 12 with the core protection tube 9 in front, there will be resistance to insertion because the outer diameters of the tip member 7 and the through hole 13 are approximately the same. After inserting the tip member 7 until it retracts from the rear end of the hollow member 12, when the hollow member 12 that encloses the tip member 7 is attached to the shaft cylinder 1 by screwing, the front portions of the collect chuck 2 and the chuck ring 4 are attached to the tip member. After entering the rear part of 7, the shaft cylinder 1
The front end of the hollow member 12 comes into contact with the rear end of the tip member 7, and while maintaining this contact state, only the tip member 7 is pressed and retracts further from the rear end of the hollow member 12, completing the installation as shown in FIG. .

As described above, the present invention provides a sharp pencil in which the lead is paid out by the back and forth movement of the collet chuck which is biased rearward by an elastic member and the chuck ring that fastens the collet chuck. move,
The rear end is regulated by the inner step of the tip member disposed in contact with the barrel, and a hollow member is attached to the barrel that holds the tip member so as to be movable in the longitudinal direction under frictional resistance. The moving distance of the chuck ring, that is, the centering length L, can be easily set by the length of the chuck ring 4 protruding from the front end of the shaft cylinder and the position of the stepped portion 10 of the tip member 7. Variations can be eliminated depending on the amount of immersion into the member 12, and a sharpening pencil with a constant centering length can be reliably obtained.

The present invention can be applied not only to the rear-end notch type sharpening pencil shown in the drawings, but also to side-knot type sharpening pencils.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal cross-sectional views of main parts of a conventional sharpening pencil, and FIGS. 3 to 5 are longitudinal cross-sectional views of main parts of embodiments of the present invention. 1...Shaft cylinder, 2...Collection chuck, 4...
Chuck ring, 6... Resilient member, 7... Tip member, 10... Step portion, 12... Hollow member.

Claims (1)

[Scope of utility model registration request] In a sharp pencil in which the lead is paid out by the back and forth movement of a collet chuck that is biased rearward by an elastic member and a chuck ring that tightens the collet chuck, the forward movement of the chuck ring is caused by pivoting the rear end. It is characterized in that a hollow member is attached to the shaft cylinder, the hollow member holding the end member so as to be regulated by an inner surface stepped portion of the end member disposed in contact with the cylinder and movable in the longitudinal direction under frictional resistance. Sharpening pencil.