JP2000043474A - Spring structure of retracting and extending type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure, in which the edge formed at the end part of a spring does not bite a flange and the inner stepped surface of a head part outer tube at the taking of the head part outer tube off an outer tube main body. SOLUTION: In a writing utensil, in which a tip fitting 3 is detachably attached to the tip of a shaft tube 1 and a writing body energized backwards by a springy member is retractably and extendibly arranged in the shaft tube, the springy member is made of a coiled spring and an inclined surface is formed at at least one end part of the coiled spring. In the writing utensil, in which the tip fitting is detachably attached to the tip of the shaft tube and the writing body energized backwards by the springy member is retractably and extendibly arranged in the shaft tube, the springy member is made of a coiled spring, and at least one end part of which is bent to the compressing direction of the spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a tip attached to a tip of a barrel so as to be detachable, and a writing body urged rearward by a resilient member is disposed in the barrel so as to be retractable. The present invention relates to a haunting writing instrument.

[0002]

2. Description of the Related Art As an example, Japanese Patent Publication No. 2-47357 will be described. According to the publication, a head outer cylinder is detachably arranged by screwing and mounting a head outer cylinder at a tip of an outer cylinder main body, and a core feeding mechanism urged rearward by a spring in the outer cylinder main body can be retracted. An arranged double knock pencil is described. More specifically, the front end of the spring is in contact with the inner step surface of the outer cylinder of the head, and the rear end is in contact with the collar fixed to the core feeding mechanism.

[0003]

However, in the writing implement having such a mechanism, when the head outer cylinder is removed from the outer cylinder main body, a corner (edge) formed at an end of the spring is formed. ,
Although the spring itself tries to rotate together with the collar or the inner step surface of the outer cylinder of the head or engages with fine irregularities (burrs, etc.), both ends engage. It cannot rotate because it is, that is, the outer cylinder and the head cylinder are connected and fixed via a spring,
As a result, there were cases where it could not be removed. here,
If a rotational force is applied more than necessary, the spring expands outward and loses its function as a spring.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a tip which is detachably provided at the tip of a shaft cylinder. A writing instrument in which a writing body urged rearward by a member is disposed so as to be able to protrude and retract, wherein the repelling member is formed as a coiled spring, and an inclined surface is formed at at least one end of the coiled spring. In the first gist, a tip is detachably provided at the tip of the barrel, and a writing body urged rearward by a resilient member is disposed in the barrel so as to be able to come and go. In a second aspect of the present invention, the repelling member is a coil spring and at least one end of the coil spring is bent in a contraction direction of the spring.

[0005]

1 and 2 show a first embodiment. Inside the barrel 1, a center shaft 2 is disposed so as to be movable back and forth, and a leading end 3 is detachably fixed to the front end of the barrel 1 by screwing or the like. A core feeding mechanism 4 is disposed inside the center shaft 2, and a longitudinal rib 5 is formed radially in the longitudinal direction of the outer periphery of the center shaft 2. This is a structure made to improve the strength of the center shaft 2. Further, a mountain-shaped inclined surface 6 is formed at every other end of the vertical rib 5. Further, a tip member 8 having a center detent member 7 provided therein is detachably fixed to the front end of the center shaft 2 by screwing or the like. The center shaft 2 having the center feeding mechanism 4 is constantly urged rearward by a retractable spring 9 such as a coil spring.

The core feeding mechanism 4 will be described. The configuration is the same as that of FIG. 3 showing the second example, so that the description will be made with reference to FIG. The lead-out mechanism 4 includes a lead tank (pressing member) 10 for storing a plurality of leads and a chuck body 11 fixed to the front end of the lead tank 10 for gripping and releasing the lead.
And a chuck ring 12 for opening and closing the chuck body 11, and a chuck spring 13 for constantly urging the lead-out mechanism 4 rearward so as to close the chuck body 11. In the present embodiment, the elasticity of the chuck spring 13 is set to be weaker than the elasticity of the spring 9. that's all,
In this embodiment, a sharp pencil unit (cursive) is constituted by the center shaft 2 and the center feeding mechanism 4.

[0007] An inner step 14 is formed on the inner surface of the leading tool 3 screwed to the tip of the barrel 1 to abut the front end of the spring 7. 14 is processed as flat as possible, but the flat surface may be plated or a lubricant may be applied. The front end of the spring 9 slides smoothly on the inner step 14 of the front tool 3 when the front tool 3 is removed from or attached to the barrel 1. At both ends of the spring 9, inclined surfaces 15 are formed (see FIG. 2), and the inclined surface 15 at the upper end is in contact with the angled inclined surface 6 of the vertical rib 5 of the center shaft 2. .

A debit cam mechanism, for example, which allows the above-mentioned sharp pencil unit to protrude and retract, is disposed behind the shaft cylinder 1. However, since it is a general mechanism, its illustration is omitted. A second example will be described with reference to FIGS. Since the writing instrument itself has the same configuration as the first example,
The description is omitted. Flat surfaces 17 are formed near both ends of the spring 16 in this example. As in the previous example, the flat surface 17 smoothly climbs over or slides over the angled slope 6 and the inner step 14.

A third example will be described with reference to FIGS. The retractable spring 18 of this example has both ends opened outwardly and is bent in the contraction direction of the retractable spring (bent portion 19). The bent portion 19 smoothly moves over or slides over the angled inclined surface 6 and the inner step portion 14. A fourth example will be described with reference to FIGS. The retractable spring 20 of this example has both ends bent in the contraction direction of the retractable spring in the same outer diameter as the spring body (bent portion 21). This bent portion 21
Moves smoothly or slides over the angled slope 6 and the inner step 14. As compared with the third example, the inner surface step portion 1
The projection spring 22 is fitted and inserted into the guide hole 22 formed above the projection 4 to prevent the spring of the retracting spring from moving and to improve the positioning.

[0010]

When the leading tool 3 is removed from the barrel 1, even if the spring 9 is rotated together with the leading tool 3, the inclined surface of the rear end of the spring 9 is angled to the vertical rib 5 of the center shaft 2. Get over the slope 6 smoothly. Also, even if the inclined surface at the rear end of the spring 9 is bitten by the angled inclined surface 6 of the longitudinal rib 5 of the center shaft 2, the step 14 on the inner surface of the leading tool 3 is inclined at the front end of the spring 9 Slides.

The above description has been made with reference to the writing implement for inclining and retracting the lead-out mechanism. However, the present invention may be applied to a rear-end knocking ball pen, and is not limited to the rear-end knocking type pen. -It may be applied to pencils and ball pens.

[0012]

According to the present invention, a tip is detachably provided at the tip of a barrel, and a writing body urged rearward by a resilient member is disposed in the barrel so as to be able to protrude and retract. A writing instrument according to claim 1, wherein said repellent member is a coil spring, and a slope is formed at at least one end of said coil spring. A writing instrument comprising a writing tool detachably provided therein, and a writing body urged rearward by a resilient member disposed in the shaft cylinder so as to be able to protrude and retract. In addition, the second gist is that at least one end of the coil spring is bent in the contraction direction of the spring. The other end slides, Sow also wood will open outward, also the desorption work ahead implement Sum - can be done's.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a main part of the present invention.

FIG. 2 is a front view showing the elastic member of FIG. 1;

FIG. 3 is a longitudinal sectional view of a main part showing a second example.

FIG. 4 is a front view showing the elastic member of FIG. 3;

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a longitudinal sectional view of a main part showing a third example.

FIG. 7 is a front view showing the elastic member of FIG. 6;

FIG. 8 is a right side view of FIG. 7;

FIG. 9 is a longitudinal sectional view of a main part showing a fourth example.

FIG. 10 is a front view showing the elastic member of FIG. 9;

FIG. 11 is a right side view of FIG.

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 2 center shaft 3 leading tool 4 core feeding mechanism 5 vertical rib 6 inclined surface 7 core detent member 8 leading member 9 projecting spring 10 core tank 11 chuck body 12 chuck ring 13 chuck spring 14 inner surface step 15 inclined surface 16 retracting Spring 17 Flat surface 18 Retractable spring 19 Folded part 20 Retractable spring 21 Folded part 22 Guide hole

Continued on the front page F term (reference) 2C353 FE02 FE14 FE16 HA01 HA06 HA09 HC04 HC06 3J059 AB07 BA01 BD01 CA20 GA50

Claims (2)

[Claims] 1. A writing implement having a tip attached to a tip end of a barrel so as to be detachable, and a writing body urged rearward by a resilient member disposed in the barrel so as to be able to protrude and retract. A spring structure for a retractable writing instrument, wherein the repelling member is formed as a coil spring, and an inclined surface is formed on at least one end of the coil spring. 2. A writing implement having a tip attached to a tip end of a shaft cylinder in a detachable manner, and a writing body urged rearward by a resilient member disposed in the shaft cylinder so as to be able to protrude and retract. The spring structure of a retractable writing instrument, wherein the repelling member is a coil spring, and at least one end of the coil spring is bent in a contraction direction of the spring.