JPH0226699Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sharp pencil having a cartridge for storing a writing lead which functions as a lead pipe as a whole.

With conventional sharp pencils, if the lead breaks, you have to take the leads out of the special lead case and refill them one by one into the sharp pencil lead pipe, which is a tedious process and requires refilling. There were drawbacks such as getting your hands dirty while working.

This invention solves the above drawbacks, replaces the entire cartridge containing the writing lead, eliminates the need to refill each lead, and does not get your hands dirty, even if the lead remains inside the sharp pencil. To provide a sharpening pencil that can be easily replaced and has an extremely simple structure.

An embodiment of this invention will be described below with reference to the drawings.

As shown in the longitudinal cross-sectional view of FIG. 1, inside the outer cylinder 1, there is a lead feeding mechanism 2, a lead guide 3 connected to the lead feeding mechanism 2, and a lead guide 3 that is removably locked in the outer cylinder 1. It has a cartridge 4.

A tip 5 is removably fitted to the tip of the outer cylinder 1, and a locking hole 1a is formed in a part of the outer circumference to engage with the protrusion 4a of the cartridge 4 and lock the cartridge 4. It is perforated. As shown in the second diagram,
A slit 1b cut in the axial direction from the rear end of the outer cylinder 1 is connected to approximately the center of the locking hole 1a.
Therefore, when inserting the cartridge 4 into the outer cylinder 1 from the axial direction and locking the protrusion 4a in the locking hole 1a,
The protrusion 4a is guided by the slit 1b so that it can be easily and reliably locked into the locking hole 1a.

A lead guide 3 is fitted into the rear end of the lead chuck 6 in the lead feeding mechanism 2. This lead guide 3 connects the writing lead 7 to the lead chuck 6.
It has a function of feeding out one core 7 at a time, and a core feeding hole 3a through which only one core 7 can be fed out is bored inside. The outer diameter of the rear end of this lead guide 3 is set such that the lead 7 does not enter into the lead delivery mechanism 2 side.
It is formed to have approximately the same diameter as the inner diameter of the outer cylinder 1.

Further, the cartridge 4 has a rear end cap 4b integrally molded at the rear end thereof, stores a large number of writing leads 7 therein, and is usually sold together with a writing refill. The outer diameter of the cartridge 4 is formed to be approximately the same as the inner diameter of the outer tube 1, and a tapered portion 4c for guiding the core is formed on the inner periphery of the tip so as to widen toward the tip. Further, a protrusion 4a that engages with the locking hole 1a of the outer cylinder 1 is provided on a part of the outer circumference.

Next, the operation and effects of this invention will be explained.

First, if the lead breaks while writing, the cartridge 4 can be removed from the outer cylinder 1 by pulling out the rear end cap 4b. Next, by pushing in the cartridge 4 in which the core 7 is newly stored, the protrusion 4 of the cartridge 4
a engages with the locking hole 1a of the outer cylinder 1, and the two automatically fit together. At this time, since the outer diameter of the cartridge 4 is almost the same as the inner diameter of the outer cylinder 1, even if the core 7 remains in the outer cylinder 1, it will be smoothly stored in the new cartridge 4 without breaking or clogging. . Also,
Since the tapered part 4c is formed at the tip of the cartridge 4, the core 7 can be reliably guided into the cartridge 4 even if the core 7 is arranged at an angle inside the outer cylinder 1. Moreover, the cartridge 4 can be used as a core storage container.
If it is directly installed and locked in the outer cylinder 1, it will function as a core pipe, so the number of parts can be extremely reduced and a sharp pencil with a simple structure can be provided.

As described above, according to this invention, by replacing the cartridge containing multiple writing leads, it is possible to eliminate the trouble of refilling the writing leads one by one as in the past, and also to avoid getting one's hands dirty. At this time, even if the core remains inside the outer cylinder, the core guiding action of the tapered part formed on the inner periphery of the tip of the cartridge will prevent the remaining core from breaking, clogging, etc. It can be stored smoothly in the cartridge. Moreover, when inserting and locking the cartridge into the outer cylinder, the protrusion on the outer circumference of the cartridge is guided by a slit cut in the axial direction from the rear end of the outer cylinder, and the locking mechanism provided on the outer cylinder is used. Since the cartridge can be easily and reliably locked into the hole, the operation of inserting and locking the cartridge into the outer cylinder can be performed very easily.
Furthermore, since the cartridge is directly locked to the outer cylinder, the structure is simple and the number of parts can be reduced, resulting in extremely excellent practical effects.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
The figure shows a plan view of one embodiment of the locking hole of the outer cylinder. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 2... Core delivery mechanism, 3... Lead guide, 4... Cartridge, 1a... Locking hole,
1b...Slit, 4a...Protrusion, 4c...Tapered portion.

Claims (1)

[Scope of utility model registration request] A lead feeding mechanism 2 installed in the outer cylinder 1, a lead guide 3 connected to the lead feeding mechanism 2, and a lead guide 3 that is formed to have approximately the same diameter as the inner diameter of the outer cylinder 1 and can be freely attached to and removed from the outer cylinder 1. A cartridge 4 for storing a core locked therein, a tapered part 4c for guiding a core formed in a tapered shape on the inner periphery of the tip of the cartridge 4, and a locking hole 1a provided in the outer cylinder 1. and the above outer cylinder 1
The locking hole 1a is cut in the axial direction from the rear end.
A sharp pencil comprising: a slit 1b connected to the slit 1b; and a protrusion 4a protruding from the outer periphery of the cartridge 4, guided by the slit 1b, and removably latched to the latching hole 1a.