JP2952824B2 - Knock button mounting structure of side knock type sharp pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side knock type sharp pencil, and more particularly to a knock button mounting structure for performing a knock operation.

[0002]

2. Description of the Related Art Side knock type shears in which a lead is extended by operating a knock button protruding from a side surface of a barrel.
Various types of pupils are known. In this sharp pencil, a lead mechanism is provided in a shaft cylinder so that a lead core is fed out by advancing a lead chuck. The working end of the knock button is provided on an inclined cam surface connected to the lead chuck or the like. The chuck has a structure in which the lead is advanced from the tip of the base by engaging the chuck to move forward. When attaching the knock button to the receiving hole formed in the shaft cylinder, there are many types in which the fulcrum is placed at the rear of the knock button and the knock button is swung in an inclined state, but in such a configuration, the knock button is operated. Need the required length to make
The button and its mounting portion have become large.

Therefore, it is conceivable to move the knock button perpendicularly to the axial direction of the shaft cylinder. Usually, the knock button is substantially tilted in cross section by an outer surface and leg pieces provided on both sides of the outer surface. It is formed in the shape of a letter, and the engaging claw provided on the outer side of the insertion end of the leg piece is only prevented from coming off from the receiving hole by engaging with the inner edge of the receiving hole of the shaft cylinder, When a load is applied to the knock button from the side in a direction in which the interval between the leg pieces is reduced, the engagement claw is disengaged and the knock button may be disengaged from the receiving hole.

[0004]

The problem to be solved by the present invention is as follows.
It is an object of the present invention to provide a knock button mounting structure for preventing the knock button from easily falling off in a side knock type sharp pencil in which the knock button is moved vertically in the axial direction.

[0005]

According to the present invention, there is provided a side knock type sharp pencil having an outer surface portion and a knock button provided with leg pieces on both sides of the outer surface portion as described above. There is provided a side knock type sharp pencil characterized by providing elongated holes in parallel so as to insert the leg pieces of the knock button and forming a partition wall between the elongated holes, and the above-mentioned problem is solved. .

[0006]

FIG. 1 shows an embodiment of the present invention.
A base (2) is provided at the front end of the barrel (1), and an eraser (3) is attached at the rear end. A core feeding mechanism is provided in the barrel (1). Although the lead-out mechanism can be variously constructed, in the figure, a slider (4) is provided in the shaft cylinder (1) so as to be slidable in the axial direction, and the slider (4) is provided at the rear part. Has a head (7) which is loosely fitted inside the barrel (1) in a detented state and has an inlet (6) for a lead core (5) formed therein. A guide tube (8) is formed, a chuck (10) is attached to the front part (9), a chuck ring (11) is fitted to the chuck (10), and a spring (1) is mounted.
It is biased backward in 2).

The slider (4) has an inclined cam surface (13), and a knock button (15) is provided so that the working end (14) comes into contact with the cam surface (13). By pressing the knock button (15), the slider (4) or the like advances from the state of FIG. 1 (A) to the state of FIG. 1 (B) to feed out the lead core (5).

As shown in FIGS. 2 and 3, the knock button (15) includes an outer surface portion (16) and a pair of legs provided opposite to both sides of the outer surface portion and having the working end (14). Piece (17), (17)
Are formed in a substantially U-shaped cross section, and engaging claws (18) are provided on the outer sides of the insertion ends of the leg pieces (17).

The knock button (1) is attached to the barrel (1).
A receiving hole (19) for mounting the receiving hole (5) is formed, and the receiving hole (19) is provided with two narrow and parallel elongated holes (2) at an intermediate portion of the receiving hole (19).
A partition (21) is provided so as to partition into (0) and (20).

The knock button (15) is connected to the leg pieces (17),
(17) is inserted into the slots (20) and (20) of the receiving hole (19), and the engaging claw (18) is engaged with the inner end (22) of the hole edge of the receiving hole (19). By this, it is attached to the shaft cylinder (1). As a result, as shown in FIG. 4, even if a load is applied to the knock button (15) in the lateral direction, the leg (17) can be prevented from being deformed by hitting the partition (21). (18) can be prevented from coming off.

In the sliding contact portion between the knock button and the barrel, the knock button protrudes in one of the circumferential directions so as to move while being guided vertically along the axial direction of the barrel.
A guide rib (23) extending in the axial direction of the cylinder can be provided, and a guide surface (24) with which the guide rib (23) slides can be formed on the other side. The guide ribs and guide surfaces can be provided at appropriate positions and in appropriate numbers. For example, as shown in FIG. 5, guide ribs (23), (23) projecting from both ends of a knock button (15) in the circumferential direction.
And the inner surface of a receiving hole (19) surrounding the guide rib or the like may be used as a guide surface (24), or as shown in FIG.
Guide ribs for the protruding middle portion in the circumferential direction (23), the provided internal surface may be the guide surface (24) of the receiving holes (19) (23). Further, as shown in FIG. 7, guide ribs (23), (23) projecting in the circumferential direction are provided on the receiving hole (19) side, and a guide surface (24) is provided on a side surface of a knock button (15) surrounding the guide rib and the like. ) May be formed.

[0012]

According to the present invention, a knock button having an outer surface and a leg provided on both sides of the outer surface in opposition to the outer surface is provided in a long hole arranged side by side with a partition wall therebetween. Is inserted and the engaging claw is engaged so as to be attached to the shaft cylinder, so that even if a lateral load is applied to the knock button, the leg piece does not bend against the partition wall. Since the engagement of the engagement claws does not come off, it is possible to prevent the engagement claws from easily falling off.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, in which (A) is in a free state and (B) is a state in which a knock button is pressed.

FIG. 2 is an enlarged cross-sectional view of a knock button portion of FIG.

FIG. 3 is a partially enlarged exploded perspective view.

FIG. 4 is an explanatory diagram when a lateral load is applied to a knock button.

FIG. 5 is a plan view of another embodiment of a knock button.

FIG. 6 is a plan view of another knock button embodiment.

FIG. 7 is a plan view of still another knock button embodiment.

[Explanation of symbols]

1 Shaft cylinder 4 Slider 5 Lead core 13 Cam surface 15 Knock button 16 Outer surface 17 Leg piece
18 Engagement claw 20 Slot 21 Partition wall 23 Guide rib 24 Guide surface

Claims (2)

(57) [Claims] 1. A side-knock-type sharp pencil in which a knock button is mounted so as to be movable in a shaft radial direction of a barrel, and the knock button is pressed to draw out a lead. The knock button has an outer surface and an outer surface. A leg piece provided opposite to both sides of the part, long holes are provided in parallel so as to insert the leg pieces of the knock button into the shaft cylinder, and a partition wall is formed between the long holes. Knock button mounting structure of side knock type sharp pencil. Wherein Izu sliding contact portion of the knock button and barrel
The guide rib according to claim 1, wherein one of the guide ribs protrudes in the circumferential direction of the barrel and extends in the radial direction of the barrel , and the other has a guide surface on which the guide rib slides. Knock button mounting structure of side knock type sharp pencil.