JP2002103879A - Writing instrument parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such possibilities that a part or the entirety of the outer peripheral wall of an inner cylinder might slide in contact with the inner peripheral wall of an outer cylinder when a projecting part formed on the inner cylinder is inserted into the groove or the window part of the outer cylinder and slides in the longer direction, and in such a case, the inner cylinder might slide with difficulty because of friction generated when the contact area is large. SOLUTION: The inner cylinder with the projecting part having diametral elasticity is inserted into the outer cylinder with the groove formed at the side in such a way that the projecting part is brought into linear or point contact with a ridge in the longer direction of the groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument such as a ballpoint pen, a mechanical pencil or a marker, and a part of a cosmetic applicator such as an eyeliner or a lip color.

[0002]

2. Description of the Related Art An outer tube having a concave rectangular groove or window on the side is provided with a convex portion which is movable in the longitudinal direction in the concave groove or window and is elastic in the radial direction. 2. Description of the Related Art There is known a writing instrument component in which provided inner cylinders are inserted and combined so that the inner cylinder can be slid in the longitudinal direction in the outer cylinder.

[0003]

In the above-mentioned conventional writing instrument component, when the protrusion provided on the inner cylinder is inserted into the groove or the window of the outer cylinder and slides in the longitudinal direction, the inner cylinder has a lower portion. There is a possibility that a part or the entire peripheral wall of the outer peripheral wall comes into contact with the inner peripheral wall of the outer cylinder and slides. At this time, if the contact area is large, friction may occur and the inner cylinder may be difficult to slide. If the inner cylinder slides while constantly rubbing inside the outer cylinder, one or both of the inner cylinder and the outer cylinder will wear and the sliding function will be significantly degraded, or in the worst case However, there is a possibility that the outer cylinder or the inner cylinder may be damaged and sliding may not be possible.

In order to overcome the above-mentioned problems, conventionally,
There was a method of applying a lubricant to the sliding part to reduce the frictional resistance between the inner cylinder and the outer cylinder.However, unevenness occurred in the application method and the lubricant was not sufficiently applied to the required places, When left for a long time or repeated sliding, the applied lubricant is volatilized, and the effect of the lubricant may not be sufficiently expected.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an inner cylinder provided with a radially elastic convex portion in an outer cylinder having a lateral groove portion. The gist of the present invention is a writing instrument part in which a tube is inserted through a line contact or a point contact of the protrusion with a longitudinal ridge line of the groove.

[0006]

An embodiment will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of each part of the outer cylinder 1 and the inner cylinder 2 according to the present invention before insertion and assembly. A window 1a is provided on both sides of the cylindrical portion of the outer cylinder 1.
Is provided. A U-shaped groove is provided on both sides of the cylindrical portion of the inner cylinder 2 to form an elastic portion.
a is provided. FIG. 2 is a perspective view showing a state where the outer cylinder 1 and the inner cylinder 2 are inserted and combined. At the time of combination, the convex portion 2a provided on the inner cylinder 2 is bent radially inward and inserted into the outer cylinder 1, and the convex portion 2a is inserted into the window 1a provided on the side of the outer cylinder 1. The deflection of the projection 2a is released. Thus, the convex portion 2a can slide in the longitudinal direction of the window portion 1a, and the inner cylinder 2 is prevented from coming off with respect to the outer cylinder 1.
Instead of the window 1a, a groove may be provided on the inner peripheral wall of the outer cylinder 1 to assemble the protrusion 2a so as to be slidable.

FIG. 3 is a longitudinal sectional view for explaining the window portion 1a and the convex portion 2a of the cylindrical portion of the combined component of FIG. It is preferable that the convex height 2b of the convex portion 2a be 0.1 mm to 1.0 mm. When the convex height 2b is 0.1 mm or less, it is easy to fall out of the outer cylinder 1, and when the convex height 2b is 1.0 mm or more, the outer cylinder 1
And the elastic portion surrounded by the U-shaped groove may be excessively bent and damaged. Further, in order to make it easier to insert the inner cylinder 2 into the outer cylinder 1, the convex portion 2a is provided with a tapered portion 2c on the side where it is inserted. Furthermore, after the insertion, the protrusion 2a is provided with a retaining wall 2d so that the inner cylinder 2 is harder to come off than the outer cylinder 1. When the inner cylinder 2 is inserted into the outer cylinder 1, the convex portion 2a bends inward in the diameter, but the convex portion 2a hits the U-shaped groove 2e so that the convex portion 2a does not remain dented. Height 2b
However, it is preferable that the groove 2e has a dimensional relationship of 2b <2e.

FIG. 4 is a cross-sectional view for explaining the window portion 1a and the convex portion 2a of the cylindrical part of the combined component of FIG. The convex portion 2a is formed in a tapered shape that becomes narrower outward in the radial direction of the inner cylinder 2. The projection 2a is in line contact or point contact with the longitudinal ridge of the window 1a. The tapered convex portion 2a is used to reduce sliding resistance when sliding in the longitudinal direction by linear contact with the window portion 1a, and also when the product is released from the mold by the split mold.
It also plays the role of a taper so as not to be taken by the mold. In addition, the said convex part 2a is arrange | positioned symmetrically in two opposing places. In addition to the two windows 1a provided in the outer cylinder 1 to make it difficult for the inner cylinder 2 to come off from the outer cylinder 1, the inner cylinder 2 in the radial direction and the circumferential direction with respect to the outer shaft 1 during longitudinal sliding. Prevents backlash.

[0009] At least one of the insertion contact portions of the outer cylinder 1 or the inner cylinder 2 is formed with a rough surface to improve wettability, and is coated with a lubricating solvent. Also,
At least one of the outer cylinder 1 and the inner cylinder 2 is made of a self-lubricating synthetic resin such as a polyacetal resin, a polyamide resin, or a Teflon resin, or a recycled material of the synthetic resin, or a mixture of the synthetic resin and the recycled material. Molded with mixed material. Alternatively, a synthetic resin such as ABS resin, polypropylene resin, polycarbonate resin, acrylic resin, polystyrene resin, polyethylene resin, polyethylene terephthalate resin, polybutylene terephthalate resin, or a recycled material of the synthetic resin, or a mixture of the synthetic resin and the recycled material A lubricant such as molybdenum, metal soap, copper powder, graphite, Teflon, or silicon is kneaded with the mixed material to form at least one of the outer cylinder 1 and the inner cylinder 2.

FIG. 5 is a perspective view of the second embodiment.
FIG. 6 is an enlarged side view of the protrusion 2a of the second embodiment. This embodiment is the same as the previous embodiment except that protrusions 2f are formed on both side surfaces of the protrusion 2a, and a V-shaped groove 2g is provided at the base of the elastic portion surrounded by the U-shaped groove.

The projection 2f is provided so that the projection 2a makes point contact with the window 1a of the outer shaft 1 when the inner cylinder 2 is inserted into the outer cylinder 1 and slides in the longitudinal direction. In addition, the contact area between the outer cylinder 1 and the inner cylinder 2 is made as small as possible to facilitate sliding. The V-shaped groove 2g is provided so that the entire elastic portion surrounded by the U-shaped groove is easily urged outward after the inner cylinder 2 is inserted into the outer cylinder 1. It is.

The present invention can take various modifications other than those described in the above embodiment. For example, as shown in FIG. 7, in order to impart radial elasticity to the convex portion 2a,
A window hole may be provided at a position in the direction of 90 degrees with respect to the convex portion 2a, and the window hole may be deformed to impart elasticity.

[0013]

According to the writing instrument component of the present invention, the outer cylinder provided with a groove on the side is provided with an inner cylinder provided with a convex part having radial elasticity, and the convex part is provided on a longitudinal ridge line of the groove. Since it is inserted through line contact or point contact, the sliding resistance generated when the inner cylinder slides inside the outer cylinder can be reduced as much as possible. With the said advantage that the cylinder can slide.

[Brief description of the drawings]

FIG. 1 is a perspective view of a writing instrument component of the present invention.

FIG. 2 is a perspective view showing a state where components for a writing implement of the present invention are combined.

FIG. 3 is a vertical cross-sectional view for explaining the part of FIG. 2;

FIG. 4 is a transverse cross-sectional view illustrating the part of FIG. 2;

FIG. 5 is a perspective view of a second embodiment.

FIG. 6 is an enlarged side view of a convex portion.

FIG. 7 is a perspective view of a modification.

[Explanation of symbols]

 Reference Signs List 1 outer tube 1a window portion 2 inner tube 2a convex portion 2b convex height 2c taper portion 2d retaining wall portion 2e groove 2f protrusion 2g groove

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Claims (6)

[Claims] 1. An inner cylinder having a convex portion having radial elasticity inserted into an outer cylinder having a groove portion on the side, and the convex portion is brought into line contact or point contact with a longitudinal ridge line of the groove portion to be inserted. A writing instrument part characterized by being made by: 2. The writing instrument component according to claim 1, wherein a U-shaped groove is provided on a side of the inner cylinder so that the convex portion is elastic in a radial direction. 3. The method according to claim 1, wherein the convex portion is formed in a tapered shape that becomes narrower outward in a radial direction of the inner cylinder. Writing instrument parts 4. The writing instrument component according to claim 1, wherein a lubricating solvent is applied to at least one of the outer cylinder and the inner cylinder. 5. A self-lubricating synthetic resin such as a polyacetal resin, a polyamide resin, or a Teflon (registered trademark) resin, a recycled material of the synthetic resin, or the synthetic resin. The writing instrument component according to any one of claims 1 to 4, wherein the component is formed from a mixture of a resin and the recycled material. 6. An ABS resin, a polypropylene resin, a polycarbonate resin, an acrylic resin, a polystyrene resin,
Polyethylene resin, polyethylene terephthalate resin,
A synthetic resin such as polybutylene terephthalate resin or a recycled material of the synthetic resin, or a mixed material of the synthetic resin and the recycled material, is mixed with a lubricant such as molybdenum, metal soap, copper powder, graphite, Teflon, and silicon. The writing instrument component according to any one of claims 1 to 5, wherein at least one of the outer cylinder and the inner cylinder is formed.