JPS6227438Y2 - - Google Patents

Description

[Detailed description of the invention] This invention utilizes the hollow space that occupies most of the upper half of the knock-type mechanical pencil, and relates to a means for attaching and using the eraser of a longer mechanical pencil than before. .

The reason why sharp pencils have become so popular today without being overthrown by ballpoint pens, etc. is thought to be largely due to their unique writing style, which is hard to throw away, and the fact that if you make a mistake, you can easily erase it with an eraser. . However, the conventional eraser attached to a sharpening pencil is simply wrapped on the outside by a metal plate and inserted into a core tube or cap, making it difficult to adjust the degree of protrusion. However, if used with a long protrusion from the beginning, it will break, so most of them have a total length of about 1 cm, and if you use a sharpening pencil frequently, you have to prepare an eraser separately, which is inconvenient. As for the quality, erasers that can erase cleanly are not used very often because they wear out quickly, and those that are actually used are of a quality that does not erase well and sometimes stains the paper surface. There was also the inconvenience that if you pressed too hard to erase, the eraser would sneak into the core tube.

On the other hand, if a sharp pencil only fulfills its original function, a body length of 10 cm or less is sufficient, but many of them are 13 to 14 cm, which is the appropriate length for writing. This is probably because the upper part of the core tube is often hollow. In order to solve the above-mentioned problems, this project utilizes this cavity, attaches a long eraser that is hard to erase, but has a good eraser ability, does not push back even when pressed hard, and can freely adjust the degree of protrusion of the eraser. It is intended to be used while

By rotating the upper part, which was applied for earlier,
Sharp Pencil Jitsubishi 56-018785, which can be used to adjust long erasers, has an eraser holder protrusion that meshes with the threaded groove, so if you accidentally knock the eraser with the eraser still protruding when protruding the lead, the eraser holder will fall off. There was a possibility of damaging it. The present design eliminates this drawback and makes it possible to knock the eraser even if it is left protruding.

To explain this invention based on the drawings, FIG. 1 shows the whole of the knock-type sharpening pencil of this invention. The upper body 1 and the pivot tube 3 are rotatably connected, and the lower body 2 and the pivot tube 3 are connected to each other via a convex portion 10 provided at the bottom of the pivot tube 3. Although it can be pulled out with a certain amount of force, it is usually tightly fitted in a fixed state. The inner periphery of the upper part 1 of the main body has a vertical groove 9 that allows the eraser receiver 5 to move up and down by loosely inserting a convex portion 13 of the eraser receiver 5 to be described later.
is provided, and a convex portion 11 of a helical tube 4, which will be described later, is fitted onto the inner periphery of the upper part of the pivot tube 3, so that even if the upper part 1 of the main body is rotated, rotation of the helical tube 4 is prevented.
Furthermore, a vertical groove 12 is provided with a length that does not impede the vertical movement of the spiral tube 4 for protruding the core.

Inside the sharp pencil body, there is a
A spiral tube 4 having a convex portion 11 on the lower end side is inserted inside the side, and a core tube 8 is inserted inside the lower side of the main body.
The lower part of the core tube 8 is equipped with a conventionally known sharp pencil lead feeding mechanism. spiral tube 4
Inside, there is an eraser holder 5 with a protrusion 13 on the outer periphery.
is inserted, the convex portion 13 passes through the spiral groove 16 of the spiral tube 4, and is loosely inserted into the vertical groove 9 of the upper body 1, and by rotating the upper body 1, the eraser receiver 5 is inserted into the spiral tube 4. can be moved up and down. The vertical movement of the spiral tube 4 is linked to the core tube 8, and the core is fed out by a core feeding mechanism. Reference numeral 7 designates a spiral tube cap with a hole through which the eraser 6 passes, and is provided at the top of the spiral tube 4, and by knocking this, the spiral tube 4 is moved up and down. Alternatively, the spiral tube 4 may be directly knocked.

Further, the core tube 8 may be provided with a funnel 14 inside thereof, or a core tube cap 15 may be inserted therein.

To explain the effects of this invention in detail, by grasping the lower part 2 of the sharp pencil body and rotating the upper part 1, the eraser receiver 5 also rotates. This is because the eraser receiving protrusion 13 is loosely inserted into the vertical groove 9. However, since the spiral tube 4 does not rotate as described later, the eraser receiver 5 moves up and down along the spiral groove 16 due to the rotation of the upper part of the sharp pencil body since the eraser receiver convex portion 13 passes through the spiral tube 4.

The reason why the helical tube 4 does not rotate is because the pivot tube protrusion 10 fits inside the lower part 2 of the sharp pencil body, and the helical tube protrusion 11 is loosely inserted into the vertical groove 12 of the pivot tube 3. be. The length of the vertical groove 12 must be sufficient to accommodate the amplitude of the notch. In addition, in this invention, since the spiral tube is separated from the main body, compared to the conventional case where a threaded groove is provided in the main body, even if the eraser is knocked, the spiral tube also moves at the same time, causing damage to the eraser receiving protrusion. Nothing happens.

When making the lead of the sharp pencil protrude as described above, as with conventional sharp pencils, any part that protrudes from the top of the sharp pencil body,
That is, it is sufficient to knock the spiral tube cap 7 (or the spiral tube 4) or the eraser 6, and the knock pressure is linked to the core tube 8 from the spiral tube 4 to feed out the lead. By fixing the funnel 14 inside the core tube 8, it is possible to prevent the replacement core from flowing back into the spiral tube when using the eraser, and by inserting the core tube cap 15 into the core tube 8, when using the eraser. This prevents the refill from flowing back into the spiral tube, and also prevents eraser scum and the like from flowing in.

According to this invention, since the eraser 6 is supported by the eraser receiver 5, the eraser will not be pushed back even if the eraser is pressed hard.
Furthermore, since it is easy to adjust the degree of protrusion of the eraser, long ones can be used, and even erasers that can be erased cleanly and that are subject to heavy wear and tear can also be used. Furthermore, if the lead is to protrude, it can be tapped at any part of the pencil that protrudes from the top of the pencil body, similar to conventional nail-type mechanical pencils.

[Brief explanation of drawings]

Figure 1 is a sectional view of the entire sharpening pencil, Figure 2
The figure is a slope view of the spiral tube cap, Figure 3 is a slope view of the eraser holder, Figure 4 is a slope view of the spiral tube, Figure 5 is a slope view of the pivot tube, and Figure 6 is the core tube with a funnel. Figure 7 is a partial perspective view of the core tube with the core tube cap inserted. 1... Upper body, 2... Lower body, 3... Pivotal tube, 4... Spiral tube, 5... Eraser holder, 6...
Eraser, 7... Spiral tube cap, 8... Core tube,
9... Vertical groove, 10... Pivot tube protrusion, 11... Spiral tube protrusion, 12... Vertical groove, 13... Eraser receiving protrusion, 14... Funnel, 15... Core tube cap.

Claims (1)

[Claims for Utility Model Registration] 1. A lower part 2 of the main body and an upper part 1 of the main body having a vertical groove 9 on the inner periphery are connected to the upper part 1 of the main body via a pivot pipe 3 having a vertical groove 12 on the inner periphery of the upper part. It is rotatably connected to the lower part 2 of the main body so as to be removable and tightly fitted to form a sharp pencil main body. Projected spiral tube 4
is provided so that the convex portion 11 fits into the vertical groove 12 of the pivot tube 3.
A core tube 8 is provided in the lower part of the main body so that the vertical movement of the spiral tube 4 is linked to the core tube 8. An eraser receiver 5 is provided with a convex portion 13 that is loosely inserted into the groove 9 and passes through the spiral groove 16 of the spiral tube 4, so that the eraser receiver 5 can be moved up and down, and by rotating the upper part 1 of the main body, the eraser receiver 5 A notch-type sharp pencil characterized by the ability to adjust the degree of protrusion of a long eraser 6. 2. A lock-type sharp pencil according to claim 1 of the utility model registration, in which a funnel 14 is provided inside the core tube 8. 3. A lock-type sharp pencil according to claim 1 of the utility model registration, in which the core tube 8 is provided with a core tube cap 15.