JPH0439028Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a sharpening pencil in which a lead can be fed out a predetermined length at a time from the tip using a notch in a notch cap.

[Conventional technology]

The conventional sharp pencil will be explained with reference to FIG. 1. A knock gap 5 is always provided between the outer cylinder end 3 and the cap head 4 at the rear of the lead tank 2 in the outer cylinder 1. are removably fitted together, and by knocking the knock cap 6 against the chuck spring 9 using the knock gap 5, the core 10 can be fed out from the tip by a predetermined length.

[Problem that the invention attempts to solve]

However, as described above, the sharp pencil always has a notch gap 5 between the outer cylinder end 3 and the cap head 4, and in particular, by swinging the outer cylinder 1, the lowering hammer 11 acts on the lead feeding mechanism A. , this core feeding mechanism A is operated by a chuck spring 9.
In the case of a sharpening pencil in which the lead 10 is sent out from the tip by operating against It is convenient to operate the knob cap 6 when adjusting the centering position or when retracting the lead after writing.

On the other hand, from the viewpoint of the design of the sharp pencil, it is preferable that the outer cylinder 1 and the knock cap 6 fitted into the lead tank 2 have the same outer diameter, and there is no difference in level between the two, and this is also a strong customer demand.

Therefore, there is a problem that the notch gap 5 existing between the outer cylinder 1 and the cap head 4 having the same outer diameter as the outer cylinder 1 impairs the design and reduces the commercial value.

[Means for solving problems]

In order to solve the above-mentioned problems, the sharp pencil of the present invention has a knock cap by providing a knock gap 5 between the outer cylinder end 3 and the cap head 4 at the rear of the lead tank 2 in the outer cylinder 1 as shown in the figure. In this sharp pencil, a cam 21 having a spiral cam surface 20 is provided on the rear outer surface of the lead tank 2, a locking portion 22 is provided at the rear end of the spiral cam surface 20, and a lock cap is provided. A contactor 19 is provided on the opening side of the helical cam surface 20 for contacting the helical cam surface 20.

[Effect]

When not operating the knob, press the knob cap 6.
When the contactor 19 is rotated, the contact cap 6 moves forward while being guided by the spiral cam surface 20 and hits the rear end of the outer cylinder 1, eliminating the knock gap 5 and creating a smart, smooth external shape.

Also, when operating the knock cap 6, such as when feeding out the lead quickly for the first time, adjusting the centering to a length suitable for writing, or retracting the lead after writing, move the grip cap 6 in the opposite direction. When the contactor 19 rotates, the helical cam surface 2
0, the knock cap 6 moves rearward and separates from the rear end of the outer cylinder 1, creating a knock gap 5, allowing the knock to be made.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a first embodiment of the present invention sharpening pencil, which is an example of a swing type sharpening pencil.

In Fig. 1, 1 is the outer cylinder, 12 is the tip pipe, and A
is a lead feeding mechanism, with lead tank 2 and lead guide 1.
3. Consists of a chuck 14, a chuck ring 15, a chuck ring receiving sleeve 16, a spring receiving portion 17, a chuck spring 9, etc. Reference numeral 11 denotes a hammer for operating this lead feeding mechanism A. 18 is a slide hammer with a tip pipe. This slide hammer 18 strikes the chuck 14 when swinging to forcibly close the chuck 14.

A moving means 7 is provided between the wick tank 2 and the knock cap 6 for moving the knock cap 6 back and forth depending on the direction of rotation of the knock cap 6. This means 7 has the following configuration.

A cam 21 having a spiral cam surface 20 with which the contact 19 comes into contact is provided on the rear outer surface of the core tank 2, and a locking portion 22 is provided at the rear end of the spiral cam 20.
is provided. On the other hand, the contact 19 is provided on the opening side of the knock cap 6, and the contact 19 is provided at the rear of the wick tank 2.
9 is removably fitted in contact with the spiral cam surface 20. A locking portion may also be provided on the front end side of the cam surface 20.

In this first embodiment, when the outer cylinder 1 is swung up and down, the reciprocating motion of the knockdown hammer 11 operates the lead feeding mechanism A, which opens and closes the chuck 14 to feed the lead 10 from the tip pipe 12.

On the other hand, when feeding out the core 10 immediately for the first time,
When adjusting the centering to a length suitable for writing, rotate the knob cap 6 while the outer cylinder end 3 and the cap head 4 are in contact with each other, and the contact 19 is guided by the spiral cam surface 20. Notsuku Cap 6
moves rearward and stops against the locking portion 22 of the cam surface 20, creating a notch gap 5. By knocking the knock cap 6 in this state, the centering mechanism A moves against the chuck spring 9, and the chuck 14 opens and closes to perform centering. When the chuck 14 is open, pressing the tip of the lead allows the lead to be retracted. To eliminate the notch gap 5,
All you have to do is rotate the lock cap 6 in the opposite direction. In this case, it is better to push the knock cap 6 a little harder.

In the case of the first embodiment, the chuck 14, the lead guide 13, and the lead tank 2 may be completely separated, partially separated, or all integrated.

It goes without saying that the present invention can also be applied to a knock-type mechanical pencil as shown in the fourth figure.

If the core tank 2 is likely to rotate due to the rotation of the knock cap 6, a rotation stopper 8 may be provided between the core tank 2 and the outer cylinder 1, and its position and structure are not particularly limited. In the case of Figure 1, at the rear,
The case shown in FIG. 3 is an example in which it is provided at the front.

[Effect of idea]

As described above, according to the present invention, when the knock operation is not performed, the knock cap 6 can be rotated and moved forward to be brought into contact with the rear end of the outer cylinder 1, so that the knock gap 5 can be eliminated, and smart fitting can be achieved. Not only can the design be improved and the product value increased, but also a cam 21 having a helical cam surface 20 is provided on the rear outer surface of the wick tank 2. A locking portion 22 is provided at the rear end and a locking cap 6 is provided.
A contactor 1 abuts against a helical cam surface 20 on the opening side of the
9, the configuration can be implemented extremely easily and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the first embodiment of the sharp pencil of the present invention, Fig. 2 a and b are explanatory views of the main parts, and Fig. 3 is a cross-sectional view showing another example of the detent position of the present invention. , FIG. 4 is a sectional view showing the second embodiment. 1... Outer cylinder, 2... Core tank, 3... Outer cylinder end,
4...cap head, 5...notch gap, 6...
Notsukucap, 7... Means of forward and backward movement.

Claims (1)

[Scope of utility model registration request] In a sharp pencil in which a knock cap 6 is removably fitted to the rear of a lead tank 2 in an outer cylinder 1 with a knock gap 5 provided between an outer cylinder end 3 and a cap head 4, the lead tank 2 is A cam 21 having a spiral cam surface 20 is provided on the rear outer surface, a locking portion 22 is provided at the rear end of the spiral cam surface 20, and a contact 19 that contacts the spiral cam surface 20 is provided on the opening side of the knob cap 6. A sharp pencil.