JPH064359B2 - Sharp pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] In the present invention, by swinging a main body lightly, a down hammer is caused to act on a lead-out mechanism, and the lead-out mechanism is operated to let out a lead from the tip. Regarding mechanical pencils that can be made.

[Conventional technology]

Referring to FIG. 1, a conventional mechanical pencil of this type knocks the lead tank 5 of the lead-out mechanism A by reciprocally moving the hammer 13 in the axial direction by swinging the main body 1 lightly. , Chuck ring receiving sleeve 11
The chuck 15 which is fitted into the chuck ring 16 which is locked to the front end of the chuck and which is connected to the lead tank 5 through the tank joint 6 is moved against the spring force of the chuck tightening spring 17 by this knock or moved by the spring force. 15
Can be opened and closed, and the core 19 can be paid out from the chuck 15 by a predetermined length and the core 19 can be paid out from the tip pipe 2.

[Problems to be solved by the invention]

However, in the above-mentioned conventional mechanical pencil,
Since there is nothing forcibly pushing the slider 3 with the tip pipe, the tip pipe 2 does not come out, and it is not possible to continue writing for a long time without knocking. In addition, in the case of the swing type, the chuck tightening spring 17 The weaker the spring force of 200 g (200 g or less), the weaker the pressing force of the hammer 13 is, and it is extremely easy to make the hammer 13 act on the lead-out mechanism A by gently swinging the main body. Therefore, in the swing type, the spring force of the chuck tightening spring 17 is weak, so that there is a problem that the chuck is reliably pulled rearward and the core is not securely held.

[Means for solving problems]

In order to solve the above problems, the mechanical pencil of the present invention swings the main body 1 as shown in FIG. 1 to cause the down hammer 13 to act on the lead-out mechanism A, and to operate the lead-out mechanism A. In a mechanical pencil capable of feeding a lead 19 from the tip of the tip 1a of the main body 1, a slider 3 with a tip pipe, which is locked with the tip pipe 2 protruding from the tip, is loosely inserted into the tip 1a of the body 1, Rear end of slider 3 with pipe and chuck 15
A cylindrical adjustment hammer 18 that is in sliding contact with the inner surface of the tip portion 1a of the main body 1 is inserted between the front end of the main body 1 and the front end of the main body 1.

[Action]

Since the present invention is configured as described above, when the main body 1 is shaken up and down, the adjusting hammer 18 and the down hammer 13 reciprocate. The adjusting hammer 18 alternately and lightly presses the slider 3 and the chuck 15 by the reciprocating motion, and when the slider 3 is pressed, the tip pipe 2 is forcibly pushed out from the tip of the tip portion 1a. Further, when the chuck 15 is pressed, the chuck 15 can be reliably returned to the inside of the chuck ring 16 by the pressing force of the adjusting hammer 18 and the spring force of the chuck tightening spring 17 so that the chuck 15 can be closed.
Is sufficiently and reliably held.

On the other hand, the hammer 13 acts on the lead-out mechanism A by reciprocating motion, knocks the lead tank 5 of the lead-out mechanism A, and causes the chuck 15 fitted in the chuck ring 16 to resist the spring force of the chuck tightening spring 17. Alternatively, the chuck 15 is opened and closed by the spring force and the pressing force of the adjusting hammer 18, and the core 19 is extended from the chuck 15 by a predetermined length,
The core 19 can be paid out from the tip pipe 2 of the slider 3 through the adjusting hammer 18.

In this case, the chuck 15 is surely returned to the inside of the chuck ring 16 by the pressing force of the adjusting hammer 18 and the spring force of the chuck tightening spring 17 to be closed, so that the core 19 is always sufficiently held by closing the chuck 15. Since there is no risk of slipping during writing, it will be difficult to write.

〔Example〕

First, one embodiment of the mechanical pencil of the present invention will be described with reference to FIG.

In FIG. 1, 1 is a main body, 1a is a tip portion thereof, and A is a main body 1.
The lead-out mechanism inserted inside the lead pipe 2 causes the lead 19
Is for paying out.

The lead-out mechanism A comprises a lead-tank side portion a on which a down hammer 13 acts, a chuck joint 14, a chuck 15, a chuck ring 16, a chuck ring receiving sleeve 11 and a chuck tightening spring 17.

The core tank side portion a is fixed to, for example, the core tank 5 as shown in the first drawing, a tank joint 6 fixed to the inner circumference of the front end portion of the core tank 5, and acted by the hammer 13 and the outer circumference of the rear portion of the core tank 5. Main body side stopper 23 provided on the inner periphery of the rear part of the main body 1 and tank side stopper 22 locked at the front end
And consists of.

An eraser holder 20 holding an eraser 4 is detachably fitted to the inner peripheral portion of the rear end of the lead tank 5, and an eraser cover 21 is detachably attached to the outer peripheral portion of the rear end of the eraser 4 or the core tank 5. ing.

A chuck joint 14 is in contact with the front end of the tank joint 6 that constitutes the lead tank side portion a, and the rear end of the chuck 15 is connected to the chuck joint 14.

A chuck ring 16 is fitted between the chuck 15 and the ring inner peripheral portion of the tip portion 1a of the main body 1, and the chuck ring 16
The rear end is locked to the front end of the chuck ring receiving sleeve 11. The chuck tightening spring 17 is inserted between the front end of the chuck ring receiving sleeve 11 and the front end of the chuck joint 14. The outer periphery of the front end portion of the chuck ring receiving sleeve 11 is fixed to the inner periphery of the main body 1 on the side of the distal end portion 1a by screws.

A slider 3 with a tip pipe, which is locked in a state where the core pipe 2 projects from the tip, is loosely inserted in the tip portion 1a of the body 1, and a body is provided between the rear end of the slider 3 with the tip pipe and the front end of the chuck 15. A cylindrical adjustment hammer 18 that is slidably contacted with the inner surface of the tip portion 1a of 1 is inserted.

The operation of this embodiment having the above structure will be described.

The lead 19 in the lead tank 5 reaches the vicinity of the chuck 15 through the tank joint 6 or the tank joint 6 and a lead guide (not shown). Shake the main body 1 up and down to hammer down
Reference numeral 13 reciprocates between the tank joint 6 and the tank-side stopper 22 locked by the body-side stopper 23.

The hitting hammer 13 alternately presses the tank joint 6 and the tank-side stopper 22 by reciprocating motion, and when the tank joint 6 is pressed, the chuck joint 14 is pushed from the tank joint 6 against the spring force of the chuck tightening spring 17. Press and chuck
When 15 is pushed out to the front of the chuck ring 16 and opened, and the tank side stopper 22 is pressed, the chuck 15 returns to the chuck ring 16 by the spring force of the chuck tightening spring 17 and closes.
The core 19 is extended from the 15 by a predetermined length, and the core is drawn from the tip pipe 2.
You can roll out 19.

Since the front end of the core tank side portion a, that is, the front end of the tank joint 6 is independent of the chuck joint 14, even if the core tank 5 is accidentally rotated, the core tank 5 and the tank joint 6 are simply rotated. Chuck 15 and chuck ring 16 connected to a chuck joint 14 in which the rotation of the lead tank 5 is separated and independent.
Therefore, there is no possibility that the chuck 15, the chuck ring 16 and the like are twisted and deformed or broken, or the core 19 is broken.

When retracting the lead 19, the eraser cover 21 is pushed in, the chuck joint 14 and the chuck 15 are moved forward against the chuck tightening spring 17 through the lead tank 5 and the tank joint 6, and the chuck 15 is held open. The tip end of the lead 19 can be pushed in to retract the tip pipe 2 at the same time.

When the main body 1 is shaken up and down, the adjusting hammer 18 and the down hammer 13 reciprocate. The adjusting hammer 18 alternately and lightly presses the slider 3 and the chuck 15 by the reciprocating motion, and when the slider 3 is pressed, the tip pipe 2 is forcibly pushed out from the tip of the tip portion 1a. Further, when the chuck 15 is pressed, the chuck 15 can be reliably returned to the inside of the chuck ring 16 by the pressing force of the adjusting hammer 18 and the spring force of the chuck tightening spring 17 so that the chuck 15 can be closed. Is sufficiently and reliably held.

On the other hand, the hammer 13 causes the tank joint 6 to reciprocate.
And the tank side stopper 22 are pressed alternately, and the tank joint 6
When pressing, the chuck joint 14 is pressed from the tank joint 6 against the spring of the chuck tightening spring 17, the chuck 15 is pushed out to the front of the chuck ring 16 and opened, and when the tank side stopper 22 is pressed, the chuck tightening is performed. The chuck 15 is returned to the inside of the chuck ring 16 by the spring force of the spring 17 and the pressing force of the adjusting hammer 18, and is closed.By repeating this, the core 19 is fed out from the chuck 15 by a predetermined length and passed through the adjusting hammer 18. The core 19 can be paid out from the tip pipe 2 of the slider 3.

In this case, the chuck 15 is surely returned to the inside of the chuck ring 16 by the pressing force of the adjusting hammer 18 and the spring force of the chuck tightening spring 17 to be closed, so that the core 19 is always sufficiently held by closing the chuck 15. Since there is no risk of slipping during writing, it will be difficult to write.

According to the present embodiment, since the cylindrical adjusting hammer 18 which is in sliding contact with the inner surface of the tip portion 1a of the main body 1 is inserted between the rear end of the slider 3 with the front pipe and the front end of the chuck 15, the front pipe Press the attached slider 3 with the adjusting hammer 18,
Since the tip pipe 2 is forcibly pushed out from the tip of the tip portion 1a, the tip pipe 2 does not fall out, and knocks until the tip pipe 2 comes out flush with the tip portion 1a. You can continue writing for a long time without.

Further, in the swing type, since the spring force of the chuck tightening spring 17 is weak, there is a possibility that the chuck 15 may be reliably pulled backward and the core 19 may not be securely held, so that there is more certainty. In order to do this, both the spring force of the chuck tightening spring 17 and the pressing force of the adjusting hammer 18 are used to sufficiently hold the core 19 by closing the chuck 15 and completely prevent the core slip during writing. You can

〔The invention's effect〕

As is apparent from the above description, according to the present invention, between the rear end of the slider 3 with the front pipe and the front end of the chuck 15, the cylindrical adjustment hammer 18 that slides in contact with the inner surface of the tip end portion 1a of the main body 1 is provided. Since it is inserted, the slider 3 with the tip pipe is pressed by the adjusting hammer 18 and the tip pipe 2 is forcedly pushed out from the tip of the tip portion 1a. Not only can you continue writing for a long time without knocking until the protruding dimension of the tip pipe 2 becomes flush with the tip 1a, but the swing type chuck chuck spring 17 has a weak spring force. In some cases, the chuck 15 may not be reliably held by pulling the chuck 15 rearward, so that the spring force of the chuck tightening spring 17 and the adjustment hammer may be adjusted to increase the certainty.
By utilizing both the pressing force of 18 and the chuck 15, the core 19 can be sufficiently held by closing the chuck 15, and the core slip at the time of writing can be completely prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing one embodiment of the mechanical pencil of the present invention. 1 ... Main body, 1a ... Tip part, 2 ... Tip pipe, 3 ... Slider with tip pipe 2, 4 ... Eraser, 5 ... Core tank, 6 ... Tank joint, 11 ... Chuck ring receiving sleeve , 13 …… Down hammer, 14 …… Chuck joint, 15
…… Chuck, 16 …… Chuck ring, 17 …… Chuck tightening spring, 18 …… Adjusting hammer, 19 …… Core, 22
…… Tank side stopper, 23 …… Main body side stopper, A
...... Core feed-out mechanism, a …… Core tank side part.

Claims (1)

[Claims] 1. A swing-down body (1) causes a down hammer (13) to act on a lead-out mechanism (A), and the lead-out mechanism (A) is operated to move the lead (19) from the tip of a tip portion (1a) of the body (1).
In a mechanical pencil capable of feeding out, a slider 3 with a tip pipe 2 which is locked with the tip pipe 2 protruding from the tip is loosely inserted into the tip portion 1a of the main body 1, and the rear end of the slider 3 with the tip pipe and the chuck 15 A mechanical pencil having a cylindrical adjustment hammer 18 slidably contacting the inner surface of the tip 1a of the main body 1 between the front end and the front end.