JPH09315086A - Side knocking type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembling, to improve the productivity and to improve the lead feeding operation by forming the sectional shape of a barrel in a special shape, and forming the member of a lead feeding mechanism in the same shape as the special shape. SOLUTION: This side knocking type mechanical pencil comprises a lead feeding mechanism disposed in a barrel 1, a through hole 3 formed at the sidewall of the barrel 1, and a knocking dowel 4 disposed radially pressably in the hole 3, wherein the mechanism is longitudinally moved by the pressing operation of the dowel 4 to feed the lead from the barrel 1. A lead introducing hole 25 to improve the passability of the lead is formed at the rear of a slide member 16 of the part of the mechanism, and a lead receiving member 25 having the profile formed in the octagonal shape of substantially the same shape as the inner sectional shape of the barrel 1 is press fitted at the rear end of the hole 25. The press fitting structure of the member 25 and the member 16 is formed so that the member 25 is engaged with the member 16 in special sectional shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention arranges a lead-out mechanism inside a shaft cylinder, forms a window hole in a side wall of the shaft cylinder, and disposes a knock piece in the window hole so that the knock piece can be pressed in the radial direction. The present invention relates to a side knock type sharp pencil for moving the lead-out mechanism forward and backward by the pushing operation of the knock piece, and feeding out the lead from the barrel by these operations.

[0002]

2. Description of the Related Art A core feeding mechanism is arranged inside a shaft cylinder, a window hole is formed in a side wall of the shaft cylinder, and a knock piece is arranged in the window hole so that the knock piece can be pressed in the radial direction. As a side knock type sharp pencil which moves the lead-out mechanism forward and backward by these actions and draws out the lead from the barrel, the utility model registration No. 3005020.
The publicity of the issue is known. Paragraph number 0009 of the publication describes "... Guide surfaces (23), (23) formed in the shaft cylinder.
A guide protrusion (25) that is in sliding contact with and is engaged with the long grooves (24) formed in the guide surfaces (23), (23),
(25) is provided along the axial direction. "..." is described. That is, the rotation of the chuck piece (12) with respect to the barrel is prevented by the long groove (2) formed on the inner surface of the barrel.
4) and a guide projection (25) formed on the chuck piece (12) engaging with the long groove (24).

[0003]

However, in the above-mentioned prior art, when the chuck piece is mounted and assembled on the shaft cylinder, first, the long groove of the shaft cylinder and the guide projection of the chuck piece are aligned, and then, , The chuck piece must be inserted in the barrel, and the assembly work is troublesome,
In addition, it took a long time to assemble, resulting in poor productivity. Further, the core of the core storage portion (20) has a long groove (24).
If it gets inside, the lead will not be guided to the lead insertion hole (14), and there is a risk of causing lead feeding failure.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, in which a lead-out mechanism is arranged inside the barrel and a window hole is formed in the side wall of the barrel. A knock piece is disposed in the window hole so as to be able to be pressed in the radial direction, and the pushing operation of the knock piece causes the lead-out mechanism to move back and forth. The first gist is that the cross-sectional shape in the barrel is made to be an irregular shape, and at least one member of the lead-out mechanism is made to have the same shape as the irregular shape, and the barrel can exhibit a lens effect. The second gist is that it is made of a permeable material. A core feeding mechanism is arranged inside the shaft cylinder, and a window hole is formed in the side wall of the shaft cylinder so that the knock piece can be pressed in the radial direction. Place it in By the pressing operation of the knock piece caused to move back and forth to the core feeding mechanism, the side knock-type finisher feeds from the barrel core by these operations - In the Pupenshiru, the cross-sectional shape of the shaft within the cylinder with formed with irregular shapes,
The lead-out mechanism is composed of at least a slider member with which the knock piece engages, and a core receiving portion, and the slider member and the core receiving member are fitted to each other by a fitting portion having an irregular cross section. The third aspect is that the core receiving portion has the same shape as the deformed shape of the barrel.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first example will be described with reference to FIGS. An uneven grip portion 2 is formed at a front grip portion (a grip portion for writing) of a shaft cylinder 1 having an octagonal inner cross section, but a rubber-like elastic body or the like may be fitted therein. Alternatively, a liquid rubber member may be applied and solidified. The grip portion 2 is formed or attached so as to relieve fatigue caused by writing, pain in fingers, and the like. Further, a through hole 3 is formed in the side wall of the barrel 1 behind the grip portion 2, and a knock piece 4 having a U-shaped cross section with respect to the barrel 1 is formed in the through hole 3. It is mounted so as to be movable in the radial direction in the vertical direction. A notch 6 is formed in the middle of the side wall 5 of the knock piece 4, and the side wall 5 of the knock piece 4 is formed.
A front inclined surface 7 is formed at the front end portion of the. The side wall of the knock piece 4 formed by the cutout portion 6 and the front inclined surface 7 serves as the first engaging portion 8. A rear inclined surface 9 is also formed on the rear surface of the cutout portion 6, and the side wall of the knock piece 4 formed by the rear inclined surface 9 and the rear end portion 10 of the knock piece 4 serves as a second engaging member. It is a joint section 11. Reference numeral 12 is an engaging claw formed on the side surface of the bottom surface of the knock piece 4, which prevents the knock piece 4 from falling off the shaft cylinder 1. Further, a clip 14 having a cap 13 formed therein is detachably fitted to the rear of the shaft cylinder 1, but only the clip 14 may be integrally molded with the shaft cylinder 1.

A slide member 16 biased rearward by an elastic member 15 such as a coil spring is arranged in front of the barrel 1. A chuck body 18 fitted with a chuck ring 17 is provided in front of the slide member 16.
Has been fixed. Needless to say, the chuck body 18
Is for releasing and gripping the core, and the chuck ring 17 is for opening and closing the chuck body 18. The core feeding mechanism is configured by these configurations. An engaging portion 19 is provided at an intermediate portion of the slide member 16.
Is formed integrally with the slide member 16, but may be formed as a separate member. When the slide member 16 and the engaging portion (material) 19 are formed by separate members, the slide member 16 and the engaging portion (material) 19 are press-fitted, fitted with concave and convex parts, or fixed to each other by adhesion or the like. .

A notch 2 is formed in the middle of the engaging portion 19.
0 is formed, and the front of the cutout portion 20 is a first engagement receiving portion 21 that engages with the first engagement portion 8 of the knock piece 4. An intermediate inclined surface 22 is formed at the rear end of the first engagement receiving portion 21 and engages with the front inclined surface 7 of the first engaging portion 8. Further, the rear of the notch 20 of the engaging portion 19 is the second portion of the knock piece 4.
The second engagement receiving portion 23 engages with the engaging portion 11 of FIG. At the rear end of the second engagement receiving portion 23, the rear end inclined surface 2
4 is formed, and the second engaging portion 1 of the knock piece 4 is formed.
1 is engaged with the intermediate inclined surface 9. Here, in more detail, the first engaging portion 8 of the knock piece 4 has the engaging portion 19
The second engagement receiving portion 23 of the engaging portion 19 is positioned so as to be sandwiched between the notch portions 20 of the first engaging portion 8 and the second engaging portion 8 of the knock piece 4. It is located in a state of being sandwiched by the joining portion 11.

Behind the slide member 16, there is a core introduction hole 2 in which about two or three cores are inserted in order to improve the passage of the core.
5 is formed, and a core receiving member 26 (see FIG. 5) having an octagonal outer shape that is substantially the same as the inner cross-sectional shape of the shaft cylinder 1 is press-fitted into the rear end of the core introduction hole 25. Has been done. The inside of the core receiving member 26 is formed in a funnel shape so that the lead is easily dropped.
At the lower end of the core, there is a core insertion hole 28 for guiding the core to the core introduction hole 25.
Are formed. The inner diameter of the core insertion hole 28 is substantially the same as the outer diameter of the core. In other words, the core tank portion 29 is formed on the inner rear side of the shaft cylinder 1 with the core receiving member 26 as a boundary, and the cores are dropped into the core introduction holes 25 one by one by the core insertion holes 28. In front of the slide member 16, a hole 30 having a diameter substantially the same as the outer diameter of the core and a chuck press-fitting hole 31 are formed continuously with the core introducing hole 25. Further, although the front member 32 is screwed to the front end of the barrel 1, it may be integrally formed with the barrel 1. A core detent member 33 for preventing the retreat of the core is press-fitted inside the tip member 32, and a core protection tube 34 such as a stainless pipe for protecting the core is press-fitted at the tip thereof. It may be molded integrally with 32.

The press-fitting structure of the core receiving member 26 and the slide member 16 is formed by engagement of mutually different cross sections. In this example, the regular hexagonal press-fitting hole 16 a of the slide member 16 and the regular hexagonal press-fitting cylinder portion 2 of the core receiving member 26 are provided.
It is press-fitted with 6a, but it is a square, triangle, or
An elliptical press-fitting structure may be used, as long as the core receiving member 26 does not rotate with respect to the slide member 16. Further, in this example, the inner cross-sectional shape of the barrel 1 and the outer shape of the core receiving member 26 are octagonal shapes in which the lengths of the long side and the short side are different, but as shown in FIG. good. The core receiving member 26 and the slide member 16
It is sufficient that the core receiving member 26 does not rotate with respect to the barrel 1 as in the press-fitting structure of. This prevents rotation when assembling (mounting) the slide member 16 into which the core receiving member 26 is press-fitted from the rear of the barrel 1 and rotation of the slide member 16 during knocking operation. However,
There is a gap so that the core receiving member 26 can slide in the barrel 1. Here, the rotation prevention of the slide member 16 does not depend only on the core receiving member 26, but the slide member 16 may have a modified cross-sectional shape like the core receiving member to prevent rotation. In addition, when the inner shape of the shaft cylinder 1 is formed in an irregular shape and the shaft cylinder 1 is molded with a transparent resin capable of exerting the lens effect, the core in the core tank can be easily confirmed by the lens action. become able to. Further, by forming the surface of the shaft cylinder 1 on the side of the clip 14 to be flat, the flat portion 1a is placed on a paper surface in which a small letter is written, and when viewed from the curved surface on the opposite side, the above-mentioned character looks large.

Next, the operation will be described. When a plurality of cores are inserted into the core tank portion 29, one core is separated by the core insertion hole 28 of the core receiving member 26 and is guided to the chuck body 18 through the core introduction hole 25 and the hole 30. still,
Even if the core is slightly curved or the slide member 16 is slightly curved due to molding or the like, the core introducing hole 25 is formed larger than the outer diameter of the core, so that the core is smoothly chucked. Guided to the body. Here, when the knock piece 4 is pressed vertically in the radial direction (see FIG. 7), the front inclined surface 7 and the intermediate inclined surface 9 of the knock piece 4 become the intermediate inclined surface 22 and the rear end inclined surface 24 of the engaging member 19. While pressing and sliding, the engaging member 19 is pressed forward. By this pressing operation, the slide member 16 and the chuck body 18 move forward, and the lead protection tube 34
The core protrudes more.

[0011]

According to the present invention, the lead-out mechanism is arranged inside the shaft cylinder, the window hole is formed in the side wall of the shaft cylinder, and the knock piece is arranged in the window hole so that the knock piece can be pressed in the radial direction. In a side knock type sharp pencil for moving the lead-out mechanism forward and backward by the pushing operation of a knock piece and feeding the lead out of the barrel by these operations, the cross-section inside the barrel is formed into an irregular shape and The first gist is that at least one member of the feeding mechanism has the same shape as the irregular shape, and the second gist is that the shaft cylinder is made of a transparent material capable of exhibiting a lens effect. In addition to arranging the lead-out mechanism inside, a window hole is formed in the side wall of the shaft cylinder, and a knock piece is arranged in the window hole so that the knock piece can be pressed in the radial direction. Movement In the side knock type sharp pencil for feeding the lead from the barrel by these operations, a slider in which the cross-sectional shape in the barrel is modified and the lead feeding mechanism is engaged by at least the knock piece A member and a core receiving portion, the slider member and the core receiving member are fitted to each other by a fitting portion having an irregular cross section, and the core receiving portion has an irregular shape of the barrel. Since the third gist is that it has the same shape as
Assembly is facilitated, productivity is improved, and the lead-out operation can be performed well.

[Brief description of drawings]

FIG. 1 is an external view showing the present invention.

FIG. 2 is an external view of a main part of FIG.

FIG. 3 is a longitudinal sectional view of FIG.

FIG. 4 is a longitudinal sectional view of an essential part for explaining an operation corresponding to FIG.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a sectional view taken along line BB of FIG. 3;

7 is a cross-sectional view illustrating the operation of FIG.

FIG. 8 is a sectional view showing a modified example of FIG.

[Explanation of reference numerals] 1 shaft cylinder 1a flat portion 2 rubber grip 3 through hole 4 knock piece 5 side wall 6 notch portion 7 front inclined surface 8 first engaging portion 9 rear inclined surface 10 rear end portion 11 second Engaging part 12 Engaging claw 13 Cap 14 Clip 15 Repellent member 16 Slide member 16a Press-fitting hole 17 Chuck ring 18 Chuck body 19 Engaging part 20 Notch part 21 First engaging receiving part 22 Intermediate inclined surface 23 Second Engagement receiving part 24 Rear end inclined surface 25 Core introduction hole 26 Core receiving member 26a Press-fitting cylinder part 27 Rotate part 28 Core insertion hole 29 Core tank part 30 Hole 31 Chuck press-fitting hole 32 Tip member 33 Core detent member 34 core protection tube

Claims (3)

[Claims] 1. A core feeding mechanism is arranged inside the shaft cylinder, a window hole is formed in a side wall of the shaft cylinder, and a knock piece is arranged in the window hole so that the knock piece can be pressed in the radial direction. In the side knock type sharp pencil which moves the lead-out mechanism forward and backward by these operations and draws the lead out of the barrel by these operations, the cross-sectional shape of the inside of the barrel is modified and at least the lead-out mechanism is formed. 1
A side knock type sharp pencil, wherein two members have the same shape as the irregular shape. 2. The side knock type shear according to claim 1.
A side knock type sharp pencil, wherein the shaft cylinder is made of a transparent material capable of exhibiting a lens effect. 3. A core feeding mechanism is arranged inside the shaft cylinder, a window hole is formed in a side wall of the shaft cylinder, and a knock piece is arranged in the window hole so that the knock piece can be pressed in the radial direction. In the side knock type sharp pencil for moving the lead-out mechanism forward and backward by these operations to draw the lead out of the barrel, the cross-sectional shape inside the barrel is modified and at least the lead-out mechanism is provided. The core member is composed of a slider member with which the knock piece engages, and a core receiving portion, and the slider member and the core receiving member are fitted together by a fitting portion having an irregular cross section, and the core bearing is formed. A side-knock-type sharp pencil, wherein the portion has the same shape as the deformed shape of the shaft cylinder.