JPH09183295A - Side knock type writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a writer against a writing weariness resulting from the gripping of a writing implement for a long time and prevent a grip member from rotating with a shaft cylinder by arranging a side-knock operating member for operating a writing mechanism on the grip member attached to the grip part of the shaft cylinder. SOLUTION: The grip part of a shaft cylinder 1 consists of the outer lateral wall of the shaft cylinder 1 and a recessed part formed on the outer lateral wall. In this recessed part, an elastic grip member 15 of an elastic material such as soft plastics is fitted. In addition, a frame-like upright wall 1d is formed, in such a manner that the open part of the shaft cylinder 1 surrounds the open part, on the peripheral part to the open part of the shaft cylinder 1 to be provided with a side knock operating member 8. Further, the grip member 15 is prevented from rotating by the upright wall 1d. Thus a writer does not feel weary of writing with this side knock-type writing implement and the grip member 13 does not rotate with the shaft cylinder 1.

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 mechanical pencil and a ballpoint pen, and more particularly to a side knock type writing instrument having an elastic grip member for preventing a writer from fatigue.

[0002]

2. Description of the Related Art Heretofore, a side knock type writing instrument of this type has been proposed, for example, as described in Japanese Utility Model Laid-Open No. 3-70994. That is, the refill 22 is inserted into the outer cylinder 21, and the refill 22 and the outer cylinder 21 are inserted.
The first elastic body 24 is inserted between the front tool 23 and the front tool 23, and a slide hole 25 is provided in the front portion of the outer cylinder 21, and an operation portion 26 that is locked to the refill 22 is provided in the slide hole 25. A rotary body 27 slidably provided and fitted into the rear end of the refill 22, a cam body 28 provided on the inner surface of the outer cylinder 21, and an axially moved cam engaged with the cam of the rotor 27. Rotating cam mechanism 30 including a cam bar 29 that moves up and down
A ball-point pen in which a second elastic body 32, which is weaker than the elastic force of the first elastic body 34, is inserted between the cam bar 29 of the rotary cam mechanism 30 and the stopper portion 31 at the rear portion of the outer cylinder 1. Is listed.

[0003]

However, such a conventional writing instrument has a problem that it is slippery and tired because the grip member is not attached. Further, even when the grip member is attached, there is a problem that the grip member rotates about the barrel.

In view of this, the present invention solves the above-mentioned inconvenience of the conventional writing instrument, in which the shaft cylinder is provided with a grip member made of rubber or soft plastic and the grip is changed so as to avoid fatigue during writing. It is an object of the present invention to provide a side-knock type writing instrument in which a knocking operation can be easily performed and a grip member is prevented from rotating with respect to a shaft cylinder.

[0005]

To achieve the above object, according to the present invention, a side knock type writing instrument having a writing mechanism slidably provided in a barrel is operated. A side-knock type writing instrument is obtained in which a side-knock operating member for that is arranged on a grip member attached to a grip portion of a shaft cylinder.

[0006]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 3 are views showing a mechanical pencil according to a first embodiment of the invention, in which a lead tank 2 is slidably provided in a barrel 1. That is, the chuck 3 is press-fitted into the tip of the lead tank 2.
Fixed. A chuck ring 4 is loosely fitted in the chuck portion 3 a of the chuck 3.

A sleeve 5 is provided on the outer side of the chuck 3, and an excessively large stroke is provided between the rear end of the sleeve 5 and the annular locking projection 1a formed on the inner side of the front part of the barrel 1. A cushion spring 6 for absorbing pressure is wound to urge the sleeve 5 forward. Further, inside the front surface of the sleeve 5, a chuck spring 7 for urging the lead tank 2 backward is provided.

Further, an opening 1b is formed in the side wall of the shaft cylinder 1, and a side knock operating member 8 is pivotally attached to the opening 1b so as to be rotatable around one end thereof, and the side knock is provided. A sliding portion 9 having a guide slope 9 a is provided integrally with the lead tank 2 at a position corresponding to the inner front end of the operating member 8. Further, in FIG. 2, reference numeral 1c is an inclined portion formed on both sides of the opening 1b of the barrel 1 so as to be easily knocked and formed to spread outward.

An eraser holder 11 integrally provided with a clip 10 is detachably provided at the rear end of the barrel 1. More specifically, the eraser holder 11 holding the eraser has a bottom portion 11a that closes the barrel 1.
In addition, a small hole 11b for replenishing the core is formed at the center of the bottom portion 11a. A cap 12 is detachably provided on the rear portion of the eraser holder 11.

A tip 13 is attached to the tip of the barrel 1 by screwing, and a slider 14 also functioning as a tip pipe that slides while holding the core is inserted in the tip 13. ing.

Explaining in detail the grip portion, the barrel 1
In the grip portion, the outer wall thickness of the shaft cylinder 1 is formed to be thin and a recess 1c is formed in this portion, and an elastic grip member 15 made of an elastic material such as rubber or soft plastic is formed in the recess 1c. Are fitted. The shaft cylinder 1 around the opening of the shaft cylinder 1 in which the side knock operation member 8 is provided
A frame-shaped upright wall 1d is formed in the portion of so as to surround this opening. The grip member 16
The rotation is prevented by the standing wall 1d as the rotation preventing means.

The operation of the side knock type writing instrument according to the embodiment of the present invention will be described below. First, when the lead is drawn out for writing, the side knock operation member 8 is pressed inward of the barrel 1. Then, since one end of the side knock operating member 8 is pivotally attached, the side knock operating member 8 is rotated about this pivot point, so that the inner corner of the other end slides on the slope 9a of the sliding portion 9 provided in the core tank 2. Move the lead tank 2 forward while moving.

In this forward movement process, the chuck ring 4 loosely fitted in the chuck portion 3a at the tip of the chuck 3 fixed to the lead tank 2 is formed inside the tip 13 of the step 13a.
, But the chuck 3 is further advanced and the lead is fed out from the tip of the tip 13 through the slider 14.
Note that when the knock is released, the lead tank 2 retracts due to the action of the chuck spring 7. In this retracting process, the chuck 3 is closed by the chuck ring 4 and holds the lead, so that writing is possible.

Continuing to write in this state, if the core wears during writing, the operating member is arranged in the grip portion, so if the side knock member 8 is knocked with the fingertip without changing the grip, the same operation as above is performed. The core can be extended by operation.
In order to store the lead after writing, the knock operation member 8 is knocked and the tip of the lead is lightly pressed to move the chuck 3 forward and open, so that the lead is retracted and stored together with the slider 14. It is possible.

4 to 6 show a second embodiment of the invention,
In the embodiment of the present invention, a pair of locking protrusions 1e are formed as rotation preventing means so as to face the upper and lower ends of the grip portion of the shaft cylinder 1, and the grip member 15 is formed by these locking protrusions 1e. To prevent rotation. In addition,
The operation of the writing instrument is exactly the same as that of the first embodiment of the invention.

[0016]

Since the structure of the present invention is as described above, a grip member made of rubber or soft plastic is provided on the shaft cylinder so as to prevent fatigue during writing, and the knocking operation is easy without changing the grip. It is possible to prevent the grip member from rotating with respect to the barrel.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a mechanical pencil according to a first embodiment of the invention.

FIG. 2 is a plan view of the mechanical pencil shown in FIG.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 2;

FIG. 4 is a vertical sectional view showing a mechanical pencil according to a second embodiment of the invention.

5 is a plan view of the mechanical pencil of FIG. 4. FIG.

6 is a plan view showing a state in which the grip member of FIG. 4 is removed.

FIG. 7 is a vertical cross-sectional view showing a conventional side knock type writing instrument.

[Explanation of symbols]

 1 Shaft cylinder 2 core tank 3 Chuck 4 Chuck ring 5 Sleeve 6 Cushion spring 7 Chuck spring 8 Side knock operation member 9 Sliding part 10 Clip 11 Eraser holder 12 Cap 13 Tip tool 14 Slider 15 Grip member

Claims (4)

[Claims] 1. A side knock type writing instrument having a writing mechanism slidably provided in a barrel, wherein a side knock operating member for operating the writing mechanism is attached to a grip portion of the barrel. A side-knock type writing instrument characterized by being placed on a member. 2. The side-knock type writing instrument according to claim 1, wherein the shaft cylinder is further provided with a rotation preventing means for the grip member. 3. The side knock operation member projects from an opening formed in a side wall portion of the shaft cylinder, and a rotation preventing means of the grip member is provided on a shaft wall portion around the opening. The side knock type writing instrument according to claim 1. 4. The side-knock type writing instrument according to claim 1, wherein the rotation preventing means is a protrusion formed on the shaft cylinder so as to correspond to a recess formed on the end of the grip member.