JPH0415520Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an eraser holder used to detachably attach an eraser to the lead tank of a sharp pencil.

(Prior Art and its Problems) In a sharpening pencil, a holder is used to hold the eraser when the eraser is detachably attached to the rear end of the lead tank. As shown in FIG. 3, the holder includes an upper striation 103 having an outward protrusion 102 with a serrated cross-section and an inward protrusion having the same shape from the rear end of a retaining ring 101 made of a metal plate. The outer protrusion 102 of the upper striation 103 is used for locking to the core tank 106, and the inward protrusion 104 of the lower striation 105 is used as an eraser. 107 is known. The retaining ring 101 serving as the eraser holder is not only inexpensive to manufacture, but also has practical effects in that it can adhere the eraser 107 to the lead tank 106 and retain the eraser 107 well. be.

However, in the retaining ring 101 described above, the inward protrusion 104 of the lower striation 105 is connected to the eraser 107.
Since it is wound so as to bite into the surface and attached to the eraser 107, the outer diameter of the front part of the retaining ring 101 inevitably becomes smaller than the outer diameter of the lower striation 105, and as a result, the retaining ring 101 The front part is separated from the inner surface of the core tank 106,
The retaining ring 101 that can hold the eraser 107 is fitted into the lead tank 106 by pressing only the lower striation 105 into contact with the inner surface of the lead tank 106. In short, in such a state, the fit of the retaining ring 101 that holds the eraser 107 fitted into the lead tank 106 is shallow and extremely weak, so it is difficult to operate the knob or apply external force to feed out the lead. The eraser 107 and the retaining ring 101 are damaged by the vibration and impact caused by the
When the eraser 107 is used, the lead tank 106 is removed along with the notch cap 108.
This causes problems such as the wick coming off and scattering the wick stored in the wick tank 106. This problem is especially true for so-called retractable sharpening pencils, in which the main body of the sharp pencil is slidably disposed within the barrel, and the tip of the sharp pencil body can be freely retracted from the barrel. This is likely to occur in the sharpening pencil that will be exposed to the problem.

To solve this problem, the longitudinal length of the lower striation 105 is increased to increase the contact area of the portion of the lower striation 105 that is pressed against the inner surface of the core tank 106, thereby increasing the contact area of the retaining ring 101 to the core tank 106. It is easy to think of ways to increase the mating force, but in addition to making it difficult to set the mating force, the mating force becomes too strong and not only damages the surface of the eraser 107, but also makes it difficult to remove the eraser 107. If it becomes extremely difficult, problems may easily occur, which is not very desirable.

(Purpose of the invention) The present invention was created in view of the above-mentioned problems, and provides an eraser holder for sharp pencils that not only locks onto the lead tank and holds the eraser, but also fits well into the lead tank. This is what we intend to provide.

(Structure of the invention) The present invention provides a holder having a C-shaped cross section for holding an eraser, the holder having a first annular section having an outward protrusion formed at the rear end, A second part having an inward protrusion formed forward of the center part of the tool.
an annular section, and an insertion section provided in front of the second annular section, the first annular section locks with the core tank, and the inward protrusion of the second annular section The gist is that the eraser is held and fitted into the lead tank on the outer peripheral surface other than the outer peripheral surface.

(Example) Hereinafter, the present invention will be explained in detail based on an example.

In FIG. 1, reference numeral 1 is a holder made by bending a rectangular metal plate into a C-shaped cross section to hold a cylindrical eraser 2, and the holder 1 has an outwardly protruding portion at its rear end. a first annular section 4 formed by consecutively forming a plurality of convex shapes in the longitudinal direction of a predetermined length having a diameter of 3; 5, a second annular section 6 formed by continuously forming a plurality of longitudinal grooves of a predetermined length;
and an insertion section 7 in front of the second annular section 6.

FIG. 2 shows another embodiment of the present invention.
An inward protrusion 8 is provided between the first annular section 4 and a second annular section 6 formed at a front position a predetermined distance l away from the first annular section 4 to strengthen eraser retention. This differs from the example described above in that a third annular section 9 is provided.

Incidentally, the annular section in the above-mentioned embodiments does not necessarily have to be composed of a plurality of longitudinal protrusions and grooves, but may include a plurality of lateral protrusions, depressions, lattice-like protrusions, grooves, or simply a plurality of protrusions and depressions. It may be formed continuously to form an annular section having outward and inward protrusions.

(effect) Hereinafter, the operation of the above-mentioned embodiment will be explained.

When winding and attaching the holder 1 to the eraser 2 by biting the inward protrusion 5 of the second annular section 6 into the surface of the eraser 2, the outer diameter of the front end of the insertion section 7 is set to the second annular section. Although the outer diameter of the eraser 6 is slightly smaller than that of the holder 1 that can hold the eraser 2,
This serves as an insertion guide when inserting the wick into the wick tank 10. The eraser 2 with the holder 1 attached is
The outward protrusion 3 of the first annular section 4 comes into contact with the rear end of the wick tank 10 and is locked, preventing further retraction, and the inward protrusion of the second annular section 6 5 prevents the eraser from swinging and is held securely, and the outer circumferential surface of the second annular section 6 other than the inwardly protruding portion 5 located at a distance l inward from the rear end of the lead tank 10 is press-fitted with the eraser 2. As a result, it bulges out to some extent, presses against the inner surface of the core tank 10, and is removably attached to the rear end of the core tank 10 with good fitting force.

(Effects of the invention) As described above, in the present invention, in a holder having a C-shaped cross section that can hold an eraser, the holder has a first annular section having an outwardly protruding portion formed at the rear end. a second annular section having an inward protrusion formed forward of the center of the holder; and an insertion section provided in front of the second annular section; The eraser is held on the outer peripheral surface of the second annular section other than the inwardly protruding part, and the eraser is fitted into the lead tank. To provide an eraser holder for a sharpening pencil, which allows the outer circumferential surface of a second annular section located a predetermined distance inward, other than the inwardly protruding part, to fit well into a lead tank, and which has excellent practical effects. can.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a vertical cross-sectional view of a holder showing another example, and FIG. 3 is a vertical cross-sectional view showing a conventional example. 1...Holder, 2...Eraser, 3...Outward protrusion, 4...First annular section, 5...Inward protrusion,
6... Second annular section, 7... Insertion section, 10... Core tank.

Claims (1)

[Scope of utility model registration request] The holder has a C-shaped cross section and can hold an eraser, and the holder has the first annular section having an outward protrusion formed at the rear end, and the first annular section formed forward from the center of the holder. It comprises a second annular section having an inward protrusion and an insertion section provided in front of the second annular section, the first annular section engages with the core tank, and the second annular section engages the core tank. An eraser holder for a sharp pencil, in which the eraser is held on the outer peripheral surface other than the inwardly protruding part of the annular section and the eraser is fitted into the lead tank.