JPS5835517Y2 - Shape pencil - Google Patents

Description

[Detailed description of the invention] This invention relates to a mechanical pencil in which the refill case can be used as a part of the barrel.

Generally, mechanical pencils have a tip barrel a as shown in Figure 1.
A lead core storage pipe 7p is provided inside the rear shaft sleeve, the tip of which is inserted into a connector C screwed onto the lead core guide pipe d, and the rear shaft protrudes rearward from the rear shaft sleeve. An eraser e and a knock camp f are applied to the end.

By the way, when storing or replenishing the lead lead in this product, first remove the rear barrel from the front barrel a, then remove the knock camp f and the eraser e from the rear end of the storage pipe p, and then use the separately prepared refill case. The steps are as follows: take out the lead core from the pipe, insert it into the storage tube, apply eraser e and knock camp f to the rear end of the storage pipe p, and connect the rear shaft tube to the front shaft tube a. It takes a lot of time and effort to insert the lead core, and it is unsanitary because your hands get dirty because you have to pick it up and insert it each time.Furthermore, you have to change the pen and use the knocking operation each time you feed out the lead core. It is extremely inconvenient.

This idea was devised to solve the above-mentioned inconvenience.
A mechanical pencil in which the refill case is part of the pen's barrel, making it easy to replace the lead without getting your hands dirty, and also allowing you to feed out the lead while you are still writing without having to change your hand. It provides:

Fig. 2 shows the state in which the refill case serving as the front barrel and rear barrel of a mechanical pencil, which is an embodiment of this invention, are separated, and 1 shows the tip with the tapered tip 2 attached to the tip. It is a shaft cylinder, and a bolt-shaped cent screw 3, a lead-core guide tube 4 fitted into the bolt-shaped cent screw 3, and a connector 5 screwed to the rear end of the guide tube 4 are housed inside as usual.
A restoring spring 6 is stretched between the head of the cent screw 30 and the collar of the connector 5.

In this invention, a short lead-core guide tube 7 that slightly protrudes from the rear end of the tip tube 1 is inserted into the connector 5, and the threaded portion 1a on the outer periphery of the rear end of the tip tube 1 is attached to the connector 5. A connecting tube 8 in the shape of a stepped bag is removably screwed together, and this connecting tube 8 has an inward annular collar 8a at its rear end that serves as a stop for removing the refill case 10, which will be described below. The inside thereof forms the insertion hole 8b of the refill case 10.

The refill case 10 is formed as a cylindrical body with openings at both ends of a required length, and the outer diameter of the tip (left end in the figure) opening 10a is approximately equal to the inner diameter of the guide tube 7, and continues to the tip opening 10a. The portion has a diameter smaller than the inner diameter of the connecting tube 8,
Also, the thick stepped portion 1 has a larger outer diameter than the insertion hole 8b at the rear end.
0b, a large number of lead cores 11 are housed inside, a knock camp 12b is applied to the tip opening 10a, and an eraser 13 is inserted into the rear end (right end in the figure) opening 10c. Also, a knock camp 12b is applied.

Therefore, when assembling the refill case 100, remove the connecting tube 8 screwed onto the tip barrel 1 as shown by the dotted line in the figure, and insert it from the rear end of the refill case 10 to the refill case 1.
0 (on the contrary, the refill case 10 may be fitted into the connecting tube 8), the refill case 10
Remove the camp 12a at the tip of the opening 10 at the tip.
a into the rear end of the guide tube 7 in the tip tube 1, and screw the connecting tube 8 again into the threaded portion 1a of the tip tube 1, thereby forming an annular collar 8a at the rear end as shown in FIG. contacts the thick stepped portion 8b of the refill case 10, and the refill case 10 is coupled to the front barrel 1 without being removed.

Then, writing is performed by holding the tip barrel 1 over the connecting barrel 8 and grasping it with the thumb, index finger, and middle finger as usual, but if the lead 11 breaks while writing, the pen should be removed. By slightly shifting the tapered tip tool 2 from the plane of the paper and applying force to the connecting tube 8, the tip barrel 1 and refill case 10 can be expanded and contracted 2.3 times without changing the grip. The lead core 11 is fed out forward.

Of course, even if the rear end of the refill case 10 is bushed as usual, the lead core 11 can be fed out.

In addition, when replacing the refill case 10, the tip barrel 1
Remove the connecting tube 8 from the refill case 10, remove it from the rear of the refill case 10, remove the refill case 10 from the guide tube 7, fit the connecting tube 8 into the new refill case 10, and install the tip shaft as described above. Just attach it to tube 1.

Note that if a clip is detachably attached to the refill case 10 as appropriate, it will be convenient to carry.

As described above, in this invention, a short guide tube is inserted into the connector inside the tip barrel, and the guide tube has a refill core with a lead core housed inside and a thick step on the outer periphery of the tip. The tip opening of the case is removably fitted, a connecting tube with an inward annular collar and an insertion hole at the rear end is fitted onto the refill case, and the collar is inserted into the thick step part of the refill case. Since the tip of the connecting tube is screwed into the threaded part of the tip barrel, the refill case is connected to the tip barrel without being removed, and forms part of the barrel of the pen. When replenishing the lead core, all you have to do is replace the entire case, and replenishment is very simple and requires no effort.
Moreover, it is hygienic as there is no need to pick up the lead lead by hand, and if the lead breaks, the lead can be fed out while still in writing without having to change the pen each time, making it convenient for practical use. It is something.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional mechanical pencil, FIG. 2 is a cross-sectional view of an embodiment of this invention in which the tip barrel and refill case are separated, and FIG. 3 is a cross-sectional view of the two combined. In the figure, 1 is the front barrel, 1a is the threaded part, and 5 is the connector 7
8 is a guide tube, 8 is a connecting tube, 8a is an annular collar, 10 is a refill case, 10a is a tip opening, and 10b is a thick stepped portion.

Claims (1)

[Scope of utility model registration request] A short guide tube 7 is inserted into the connector 5 inside the tip barrel 1, and the guide tube 7 houses a lead core 11 therein, and a refill case 10 is provided with a thick step 10b on the outer periphery of the tip. A connecting tube 8 having an inward annular collar 8a and an insertion hole 8b at the rear end is fitted onto the refill case 10, and the collar 8a is inserted into the refill case 10. 10, and the tip of the connecting tube 8 is screwed into the threaded portion 1a of the tip barrel 1.