JPS6234789Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed so that the writing lead can be removed from the lead holder and stored in the lead tank.
This invention relates to a click-type mechanical pencil that can be easily changed to a core of the color or density desired by the user.

With conventional notch-type sharp pencils, when you remove the lead from the lead holder while writing, you have to expand the chuck and push the tip of the lead with a prong to push the lead back into the lead tank, making it difficult to operate. It was troublesome. Therefore, the inside of the wick tank is divided into several parts,
If you try to use wicks of different colors or densities by storing wicks of different colors or densities in each of them,
It was not possible to return the lead in the lead tank while writing, and in the past, only lead holders were devised that did away with parts such as the lead holder and tightening ring.
However, when using a lead holder type, the lead would fall out when the chuck was opened, and the lead could not be fed out in a fixed amount at a time, so it had very little commercial value and was not commercially available at all. .
Therefore, the user has to hold a number of lock-type mechanical pencils containing various leads and use them as needed, which is extremely wasteful.

As a result of careful consideration, the inventor of the present invention found that by retracting the mechanism consisting of the chuck, tightening ring, and inner cylinder to pull out the lead being written from the lead holder, and by expanding the chuck, the lead was placed inside the lead tank. The object of the present invention is to provide a lock-type mechanical pencil that can be stored and eliminates all of the above-mentioned conventional drawbacks.

The structure of this device will be explained based on the drawings. As shown in FIGS. 1, 2, 3, and 4, a sheath 3 is screwed onto the rear part of a shaft 2 that houses a lead holder 1. At the same time, the inner stage 2 of this shaft 2
A return spring 5 is resiliently pushed between A and the outer stage 4A of the inner cylinder 4, and a projection 4C provided on the elastic piece 4B of the inner cylinder 4 is locked to the front window 2B of the shaft 2.
A tightening ring 6 is loosely fitted into the groove 4D of the inner cylinder 4, and the tightening ring 6 is fitted around the outer periphery of the head of the chuck 7. A core tank 8 is fixed to the rear of the chuck 7, and the elastic force of a chuck spring 9 provided between the core tank 8 and the inner cylinder 4 causes the head of the chuck 7 to press against the tapered surface of the tightening ring 6. The chuck 7 is pressed closed and holds the wick 10 firmly. However, the elastic force of the chuck spring 9 is configured to be weaker than that of the return spring 5. The key 8A of the core tank 8 is inserted into the keyway 3A of the sheath 3, and the core tank 8 and the sheath 3 are configured to slide back and forth but cannot rotate. Distance L ₁ to stage 3B is the distance from the rear end of lead holder 1 to the tip of shaft 2
It is longer than L ₂ . Several lead storage chambers 8B provided in this lead tank 8 are configured radially outward from the center of the shaft 2, and furthermore, the rear end is opened so that the lead 10 can be taken in and out. A display device 3C is provided on the surface of the sheath 3 in accordance with the lead storage chamber 8B of the lead tank 8. The core tank 8
At the center is a wick tank 8 and a rotatable sorting pipe 1.
1 is attached, and the sorting pipe 11 is provided with a through groove 11A through which the core 10 can pass. A stopper 12 is fixed to the inside of the rear part of the sorting pipe 11, and a knob 13 is fitted to the outside of the semi-cylindrical rear part of the sorting pipe 11 to close the rear end opening of the core storage chamber 8B. A matching mark 13A is provided on the surface of 13. Lead storage chamber 8B of this lead tank 8
Cores 10 of various colors are housed in each of the display devices 3C to match the color of the display device 3C.

When it is attempted to feed out the lead 10 in the state shown in FIG. 1, by knocking the knob 13, the chuck 7 moves forward and the lead 10 is drawn out. If you then try to use core 10 of another color,
First, press the protrusion 4C of the inner cylinder 4 and press the front window 2B of the shaft 2.
When it is removed, the inner cylinder 4 is moved back by the elastic force of the return spring 5, and the lead 10 is also moved back while being held by the chuck 7 and is removed from the lead holder 1. In addition, if the lead 10 protrudes longer than the tip of the shaft 2, by opening the chuck 7 by turning the knob 13 and returning the lead 10 to the end of the shaft 2, the lead 10 can be easily removed from the lead holder 1. Can be removed. Furthermore, the inner cylinder 4
When the core tank 8 moves backward, the key 8A of the core tank 8 comes into contact with the inner stage 3B of the sheath 3, and the chuck 7 stops, but the inner cylinder 4
is moved backward by the elastic force of the return spring 5, and the tightening ring 6 comes off from the head, opening the chuck 7. The protrusion 4C of the inner cylinder 4 is connected to the rear window 2 of the shaft 2.
When the inner cylinder 4 is locked with C, the inner cylinder 4 is stopped and enters the state shown in FIG. In this state, drop the lead 10 you are writing on into the sorting pipe 11 with the rear part (direction of the knob 13) of the knock-type sharp pencil facing down, and put the same display device 3C and knob 1 as the lead 10 you were writing on.
Return the lead 10 that was being written into the lead storage chamber 8B through the through groove 11A of the sorting pipe 11 with the matching mark 13A facing downward. After this, turn the knob 13 and make the matching mark 1.
Display device 3 of the same color as the core 10 for which 3A is newly desired
C, the core storage chamber 8B in which the desired core 10 is stored and the through groove 11A of the sorting pipe 11.
are aligned, and the lead guide hole 11B and the lead storage chamber 8B are opened. In this state, if you point down the display device 3C that has the same color as the desired lead 10, 10 will appear in the lead guide hole 1.
It is inserted into 1B. Next, when the knob 13 is pressed, the chuck 7 and the lead tank 8 are moved forward, and the chuck spring 9 is fully compressed. When the knob 13 is further pressed, the inner cylinder 4 is also moved forward against the elastic force of the return spring 5, and the protrusion 4C of the inner cylinder 4 is removed from the rear window 2C of the shaft 2. And the protrusion 4 of the inner cylinder 4
When C is fitted and locked in the front window 2B of the shaft 2, if the pressure on the knob 13 is released, the state shown in FIG. 1 is restored.

As is clear from the above explanation, the present invention provides a lock-type mechanical pencil in which a lead tank fixed to the chuck is provided with a plurality of lead storage chambers. The cylinder is elastically pushed backward in the axial direction by a return spring that is stretched between the inner stage of the shaft and the inner cylinder and has a stronger elastic force than the chuck spring, and the distance between the core tank and the sheath is reduced. The feature is that the distance is longer than the distance from the tip of the shaft to the rear end of the lead holder.
Therefore, by releasing the lock of the inner cylinder from the shaft,
The inner cylinder is moved back by the return spring, and the lead is pulled out from the lead holder. When the inner cylinder is moved back further, the key of the lead tank comes into contact with the inner stage of the sheath and expands the chuck, so that the lead is removed from the lead tank. It is returned to the core storage room. In addition, the lead stored in the lead storage chamber of the lead tank can be taken out and used by holding it in the chuck, so a variety of leads with different colors or densities can be used with one lock-type pencil pencil, making it very economical. It is also convenient to carry. Moreover, in spite of the above-mentioned effects, the distance between the lead holder and the chuck does not become long, so the remaining lead remains in the same way as a conventional knock-type mechanical pencil, which is advantageous in that it is economical.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the knock-type mechanical pencil of this invention, Fig. 2 is a plan view showing the rear part of Fig. 1, Fig. 3 is a transverse sectional view taken along line A-A in Fig. Figure 4 is a cross-sectional view taken along line B-B in Figure 1;
FIG. 5 is a longitudinal cross-sectional view showing the lock-type mechanical pencil shown in FIG. 1 in a state in which the lead has been returned. 1... Core holder, 2... Shaft, 2A... Inner stage of shaft 2,
2B...front window of axis 2, 2C...back window of axis 2, 3...sheath,
3A...Keyway of sheath 3, 3B...Inner stage of sheath 3, 3C...
Display device of the sheath 3, 4...Inner cylinder, 4A...Outer stage of the inner cylinder 4, 4B...Elastic piece of the inner cylinder 4, 4C...Protrusion of the inner cylinder 4, 4D...Concave groove of the inner cylinder 4, 5...Return spring , 6...Tightening ring, 7...Chuck, 8...Lead tank, 8A...Key for lead tank 8, 8B...Lead tank 8
Core storage chamber, 9...Chuck spring, 10...
Core, 11...Selection pipe, 11A...Selection pipe 11
11B...core guide hole of the sorting pipe 11, 12...plug, 13...knob, 13A...signature of knob 13.

Claims (1)

[Scope of utility model registration request] A lead holder 1 built into the shaft 2, a chuck 7 pushed axially rearward by a chuck spring 9, and a chuck 7 fitted around the outer circumference of the head of the chuck 7 and loosely fitted into the inner cylinder 4. It is composed of a tightening ring 6 that opens and closes the chuck 7, and a lead tank 8 that is fixed to the chuck 7 and has a lead storage chamber 8B divided into a plurality of parts, and the lead 10 stored in any of the lead storage chambers 8B is In a lock-type sharp pencil that is gradually drawn out following a chuck 7, an inner cylinder 4 built into the shaft 2 that can be locked at at least one point is inserted between the inner stage 2A of the shaft 2 and the inner cylinder 4. The sheath is elastically sprung backward in the axial direction by a return spring 5 which is stretched over and has a stronger elastic force than the chuck spring 9, and can come into contact with the key 8A from the rear end of the key 8A provided in the core tank 8. Inner row 3 of 3
A knock-type sharp pencil characterized in that the distance from the tip of the shaft 2 to the rear end of the lead holder 1 is longer than the distance from the tip of the shaft 2 to the rear end of the lead holder 1.