JPS5845103Y2 - Shape pencil - Google Patents

Description

[Detailed description of the invention] This invention makes it possible to feed out the lead that wears out as you write without changing your grip on the writing instrument, and also allows you to always remove the lead when the writing instrument is in the writing state when transitioning from storage to writing. This relates to a mechanical pencil in which a lead of a certain length protrudes from the tip of the writing instrument.

Conventionally, mechanical pencils have been designed to feed out the lead that wears out as you write without changing your grip on the writing instrument.As you write, as the lead wears out, the lead protection tube fitted over the lead retracts, reducing the writing distance. ′ has been proposed.

These proposals have increased the writing distance with one lead feed operation, but once the lead protection tube has retreated to its most retracted position, writing becomes impossible, and the lead must be sent out again, making the operation difficult. However, there remains the inconvenience of having to change the way the user holds the writing instrument.

The present invention has been made to solve the above-mentioned disadvantages of conventional mechanical pencils, and the present invention will be described in more detail below with reference to an embodiment shown in the accompanying drawings.

(In the following explanation, the front means the left side of the figure, and the rear means the right side of the figure.

) In Fig. 1, reference numeral 1 is a main body, and at the rear inside of the main body 1 is a lead core storage chamber 2 for storing a spare lead core.
is formed, and a tip member 3 is screwed onto the front part.

A holding cylinder 6 is disposed inside the main body 1, and is provided with a plurality of splits 4 of appropriate lengths from the front end, and a tapered portion 5 extending forward on the inner surface.

The outer periphery of the holding cylinder 6 is removably fitted to the outer periphery,
Further, a tightening ring 9 is disposed between the rear end surface and the protrusion 7 in the main body 1, and is constantly pressed forward by a spring 8 stretched.

Inside the holding cylinder 6, a tapered part 10 is provided on the outer surface of the holding cylinder 6 so as to be in sliding contact with the tapered part 5 of the holding cylinder 6, and a plurality of steps of appropriate length are provided from the front end. a spring 12 whose one end is locked to the rear step portion 11 of the holding tube 6;
A collet chuck 13 that is always pressed rearward is slidably disposed.

Reference numeral 14 denotes a lead core guide tube that is slidably disposed within the tip member 3, and is constantly pressed forward by a spring 16 whose one end is locked to a step 15 within the main body 1.

Further, after the lead core guide tube 14 is retreated by an appropriate length against the elastic force of the spring 16, the rear end portion 17 of the lead core guide tube 14 comes into contact with the front end surface of the tightening ring 9. The tightening ring 9 is moved back.

A cap portion 18 with a bottom 19 is removably fitted onto the outer surface of the main body 1, and when the cap portion 18 is fitted onto the main body 1, the bottom 19 of the cap portion 18 is attached to the lead core. It comes into contact with the front end surface of the guide tube 14 and presses the lead-core guide tube 14 rearward.

A hole 20 having a diameter large enough to insert a lead core is provided in the bottom 19 of the cap portion 18, and when the bottom 19 retreats the lead core guide tube 14, the lead core guide tube 14 is inserted. The lead core cannot be prevented from protruding from the core guide tube 14.

It is more preferable that the hole 20 has a size that allows the lead core to be held lightly.

Next, the operation of the above-described embodiment will be explained.

When writing is finished and the mechanical pencil is stored, the front end surface of the lead guide tube 14 and the front end surface of the lead lead are substantially on the same plane, as shown in FIG.

Alternatively, the front end surface of the lead core is at a position farther back than the front end surface of the lead core guide tube 14.

When the cap section 18 is fitted onto the main body 1 and moved back from this state, the bottomed bottom 19 of the cap section 18 comes into contact with the lead core guide tube 14, causing the lead core guide tube 14 to retreat.

At this time, since the lead core is held by the collet chuck 13, the lead core protrudes from the front end surface of the lead core guide tube 14, but since the hole 20 of the cap portion 18 is provided,
Its protrusion cannot be prevented.

When the cap portion 18 is fitted onto the main body 1 in this manner, the rear end portion 17 of the lead core guide tube 14 comes into contact with the front end surface of the tightening ring 9, and is tightened against the elastic force of the spring 8. The attachment ring 9 is moved backward and removed from the holding cylinder 6, and the holding cylinder 6 is expanded.

When the holding tube 6 is expanded, the collet chuck 13 disposed inside the holding tube 6 is unfastened by the holding tube 6, so that it is expanded in the same way as the holding tube 6, and the lead core is removed. release the grip.

(See Fig. 2) The collet chuck 13, which has released its grip on the lead core, is elastically repelled backwards by the elastic force of the spring 12 at the same time as the aforementioned expansion, and the taper portions 5 and 10 are The collet chuck 13 moves backward due to the action of
is tightened again, grips the lead core again, and is stopped as shown in FIG.

Due to the above-mentioned action, the collet chuck 13 has a different gripping position before the lead core is gripped and when the lead core is gripped again after release, that is, the grip position when the lead core is gripped again is the lead core. The position will be behind the grip position before the grip is released.

The mechanical pencil is stored in this state (the state shown in FIG. 3).

When writing again, it is only necessary to move the cap part 18 in the direction to remove it from the main body 1 from the stored state shown in FIG. 3 described above.

That is, when the cap part 18 is moved from the main body 1 in the above-described direction, the lead core guide tube 14, which had been pressed and retreated by the bottom part 19 of the cap part 18, is moved forward by the spring 16.

(See FIG. 4) As the lead core guide tube 14 moves forward, the tightening ring 9 is also moved forward by the spring 8, and as the tightening ring 9 moves forward, the holding tube 6 is tightened and its diameter is reduced.

Since the diameter of the tapered portion 5 on the inner surface of the holding tube 6 is also reduced due to the diameter reduction of the holding tube 6, the collet chuck 13, which had been retracted by the spring 12, is moved back to the center of the collet chuck 13 that is in sliding contact with the tapered portion 6. By sliding the tapered portion 10 forward on the tapered portion 6, the collet chuck 13 is advanced while gripping the lead core.

As the collet chuck 13 advances in this manner, the lead core moves forward and protrudes from the tip of the lead guide tube 14 by a predetermined length (according to the difference in gripping position of the collet chuck 13 described above), and is in a writing state.

When the cap portion 18 is completely removed from the state shown in FIG. 5, the writing state is achieved.

In addition, although the state shown in FIG. 3 was previously assumed to be the stored state,
There is no problem in storing the cap portion 18 without removing it from the main body 1 while the lead core is fed out.

Next, the effect of feeding out the lead core during writing will be explained.

The feeding action of the lead core during writing is shown in FIGS. 6 to 9.

This action differs from the above-described feeding of the lead core by the cap part 18, as the lead core wears out as the user writes, and the writing tip of the lead core becomes flush with the front end surface of the lead guide tube 14. Lead core guide tube up to 14. Tightening ring9. Holding tube 6.
The internal mechanism such as the collet chuck 139 does not operate.

As the writing continues after the front end surface of the lead guide tube 14 and the writing tip of the lead lead line are aligned, the lead lead guide tube 14 is retracted as the lead lead wears out, and after the lead lead guide tube 14 has retreated by a predetermined amount, the tightening ring 9 is moved back. The holding tube 6 is then removed.

After the tightening ring 9 is detached from the holding cylinder 6 in this way, if the mechanical pencil is lifted from the writing surface, the lead core will be fed out by the same action as the cap part 18 feeding out the lead lead. It is done.

As mentioned above, there is a main body in which a lead core storage chamber is formed at the rear of the interior, and a tapered part disposed inside the main body, which has a plurality of sections of appropriate length from the front end, and which widens toward the front on the inner surface. a holding tube provided with a holding tube; a tapered portion slidably disposed within the holding tube and slidably contacting a tapered portion of the holding tube; a collet chuck provided with a plurality of splits of appropriate length; a lead core guide tube slidably disposed at the tip of the main body and protruding outward from the tip of the main body; and the holding member. a tightening ring that is removably fitted to the outer periphery of the part, a spring that always pushes the tightening ring forward, a spring that always pushes the collet chuck backward, and a spring that always pushes the lead core guide tube forward. It has a pressing spring, and a cap part that is fitted onto the outer surface of the main body and presses the front end of the lead core guide tube, and has a hole inside thereof having a diameter into which the lead core can be inserted. According to this invention, when the cap part is removed from the main body when writing, the lead has already been protruded to the state where it can be written, so writing can be started immediately, and the lead can be fed out as before. This eliminates the inconvenience of having to change the mechanical pencil's hand to write after writing.Furthermore, when the lead has worn down a predetermined length, the mechanical pencil can be moved from the writing surface without changing the grip on the mechanical pencil. This can be done simply by separating them, which has a great practical effect.

In the above-described embodiments, the hole 20 is formed integrally with the cap portion 18, but the present invention is not limited thereto. It can be formed by inserting a pressing member 1022 on which a disk 1021 having a shape is formed into the cap part 18, or by fitting the cap part 8 and the main body 1, which are generally used in writing instruments, as shown in FIG. The front end of the holding member 1222 is bottomed, and a hole 1 is formed in the bottom.
220, and the holding member 1222 is inserted into the cap portion 8, and various modifications can be made.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view showing the present invention, Figures 2 to 5 are illustrations of the operation of feeding out the lead lead by the cap, and Figures 6 to 9 are illustrations of the operation of feeding out the lead lead during writing. 10 to 12 show other embodiments of the present invention. 1...Main body, 2...Lead core storage chamber, 4.
...divide, 5...taper two parts, 6...
...Holding tube, 8...Spring, 9...
...Tightening ring, 10... Taper part, 12.
... Spring, 13 ... Collet chuck, 14 ... Lead core guide tube, 16 ...
Spring, 18... Cap section, 20, 1020.
1220...hole.

Claims (1)

[Claim for Utility Model Registration] A main body in which a lead core storage chamber is formed at the rear of the interior, and a plurality of partitions of appropriate length arranged from the front end of the main body,
and a holding tube having an inner surface with a tapered portion that widens forward; and a taper that is slidably disposed within the holding tube and comes into sliding contact with the tapered portion of the holding tube. A collet chuck, a part of which is provided on the outer surface and has a plurality of sections of appropriate length from the front end, and a collet chuck that is slidably disposed at the tip within the main body and protrudes outward from the tip of the main body. a lead core guide tube configured to do so; a tightening ring removably fitted to the outer periphery of the holding portion; a spring that constantly presses the tightening ring forward; and a spring that constantly presses the collet chuck backward. a spring that constantly presses the lead core guide tube forward; a spring that is fitted onto the outer surface of the main body to press the front end of the lead core guide tube and has a diameter that allows the lead core to be inserted; A mechanical pencil characterized in that it has a cap portion with a hole provided inside.