JPH0318224Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sharpening pencil with a rotating eraser holder.

A conventionally known rotary eraser holder is shown in FIG. 1, for example. That is, a spring guide rod 1 and a coil spring 2 positioned around the rod-shaped portion 1a of this guide rod 1.
and an inner cylinder 3 having a male thread 3a on its outer surface,
It consists of an outer cylinder 4 having a female thread 4a on its inner surface that is screwed into the male thread 3a, and an eraser 5 attached to an eraser grip part 3b formed on the inner cylinder 3.

In the rotary eraser holder having such a structure, when the eraser 5 side is facing down and the tip of the eraser 5 is placed on the part of the paper where the characters are to be erased and the outer tube 4 is pushed down, the eraser is pressed against the paper surface and the inner tube 3 is pressed down. When the eraser 5 is inserted into the outer cylinder 4, it is rotated by the male screw 3a and the female screw 4a, and the eraser 5 is also rotated. By this operation, the tip of the eraser 5 is pressed against the paper surface and rotated, so that characters written on the paper surface are erased.

On the other hand, sharp pencils generally have a structure in which the lead is pushed out little by little by pushing a lead storage cylinder into which the lead is placed. Further, an eraser holder is provided at the rear end of the core storage cylinder, and the eraser is attached to the eraser holder and a cap is placed over the eraser holder. By pressing this cap, the above-mentioned centering operation is performed.

In order to combine the rotating eraser holder with the above structure with a sharpening pencil, place the rotating eraser holder at the rear end of the sharpening pencil's core storage tube (the side where the eraser of a general sharpening pencil is attached), Centering can be performed by pushing the rear end of the core storage cylinder with this rotary eraser holder (for example, the tip end surface of the spring guide rod 1 shown in FIG. 1).

However, since the rotating eraser holder has a structure as shown in FIG. After being pushed in, the entire body including the spring guide rod 1 will move. Therefore, the moving distance for the centering operation becomes long, which is undesirable. Furthermore, when the eraser 5 is pressed to push the inner tube 3 into the outer tube 4, the inner tube 3 and therefore the eraser that is being pressed rotates, making it difficult to perform centering operations.

By providing a centering mechanism in addition to the sharp pencil part and the rotating eraser holder part, the present invention enables storage in the sharp pencil part without moving the inner cylinder in the rotating eraser holder part into the outer cylinder. To provide a sharpening pencil with a rotary eraser holder which enables centering operation by pushing the lead cylinder.

The specific structure of the mechanical pencil with a rotary eraser holder according to the present invention will be described below based on an embodiment shown in the drawings. Fig. 2 is a sectional view of an embodiment of the present invention, and Fig. 3 is an exploded perspective view of the above embodiment. part 13 and a flange 14 housed therein.
A chuck outer cylinder 14 having a cylindrical shape as a whole and having a male thread 14b on its outer peripheral surface.
, a core storage cylinder 15 located inside the grip portion 12 and whose tip is integrally connected to the chuck 16 , and a floating ring 17 located around the chuck 16 .
A core section 19 having a core tube 18 at its tip and screwed onto the chuck outer tube 14, and a core section 19 provided between the flange 14a of the chuck outer tube 14 and the flange 15a of the core storage tube 15. It is composed of a tail presser spring 20.

This structure is the structure of a general sharpening pencil, and its centering operation is as follows.

When the core storage tube 15 is moved to the left in the drawing against the force of the core presser spring 20, the core retainer chuck 16 at its tip also moves to the left while holding the core 10.

At this point, the floating ring 17 also moves, but the guiding portion 19
Since movement is blocked when it hits the stepped portion 19a, only the tail chuck 16 moves beyond that point.
The tail chuck 16, which had been squeezed by the floating ring 17, is therefore opened. When the force pushing the core storage tube 15 is removed, the core storage tube 15 is returned to the right in the drawing by the core presser spring 20, and the core retainer chuck 16 is also moved back to the right. At this time, the floating ring 17 also moves until it touches the tip 14c of the chuck outer cylinder 14. When the core presser chuck 16 is still moved backward, it is pressed and squeezed by the floating ring 17 and grips the core 10.

Through such an operation, the core 10 is fed out little by little.

Next, the structure of the rotary eraser holder and centering mechanism of the present invention will be described. In FIGS. 2 and 3, 21 is a spring guide rod, 22 is a spring, 23 is an inner cylinder, 24 is an outer cylinder, and 25 is an inner cylinder 23.
Eraser restraining ring attached to the rear end, 26
are erasers, and these constitute the rotating eraser holder. Further, 27 is a core extrusion tube slidably fitted on the outside of the outer tube 24, 28 is a core extrusion cap fitted on the inside of the end of the grip part 12, and 29 is an outer tube fixing claw. It constitutes a centering mechanism.

The operation of the sharpening pencil with rotating eraser holder equipped with the centering mechanism as described above will be explained. The outer cylinder 24 has a spirally formed female thread 24a, and the inner cylinder 23 has a male thread 23a that engages with the female thread 24a.The inner cylinder 23 is normally rotated as shown in FIG. It is in the position shown (the rightmost position). When the eraser 26 is pushed to the left, the inner cylinder 23 moves against the force of the spring 22 and rotates at the same time. That is, it operates exactly the same as the rotating eraser holder shown in FIG.

On the other hand, when the core extrusion cap 28 is fitted into the grip part 12 and further pushed in, its end 28a pushes the end face 27a of the core extrusion cylinder 27, causing it to move to the left in FIG. Due to this movement of the core extrusion tube 27, the other end surface 27b becomes the tip surface 1 of the core storage tube 15.
Press 5b to move this. As a result, the above-mentioned centering operation is performed. Here, if the distance l between the inner surface of the lead extrusion cap 28 and the end surface of the eraser 26 is set to be larger than the amount of movement of the core storage cylinder 15 during centering, the lead will be extruded during the centering operation. The cap 28 never presses the eraser 26. Furthermore, when erasing characters using the eraser 26, the outer cylinder 24 is fixed to the grip part 12 by the outer cylinder fixing claw 29, so that the sharpening pencil part is not affected.

Among the structures shown in the above embodiments, the sharp pencil portion represents the most commonly used structure, and is not limited thereto. In other words, any structure in which centering is performed by moving the lead storage cylinder back and forth can be used in the sharp pencil with rotary eraser holder of the present invention.

As explained above based on the embodiments, the sharpening pencil with rotating eraser holder of the present invention has
Centering can be performed by pressing the lead extrusion cap in the same way as a general sharpening pencil, and this operation can be performed without the inconvenience of increasing the amount of movement or rotation for extruding the lead.
Furthermore, by removing the lead extrusion cap, the rotary eraser can be operated independently of the centering operation.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a conventional rotating eraser holder, and FIG. 2 is a cross-sectional view of an embodiment of a sharpening pencil with a rotating eraser holder of the present invention.
FIG. 3 is an exploded perspective view of the above embodiment. 15... Core storage cylinder, 23... Inner cylinder, 24... Outer cylinder, 26... Eraser, 27... Core extrusion cylinder, 28...
... Core extrusion cap.

Claims (1)

[Scope of utility model registration request] A sharp pencil part which is housed in a cylindrical grip part and whose centering is performed by advancing and retracting the core storage cylinder; an outer cylinder which is housed in the grip part and has a female thread; and a male screw which is screwed into the female thread. a rotary eraser holder section consisting of an inner tube with an eraser attached to its rear end; and a centering mechanism that pushes the core storage tube to perform centering, and the centering mechanism slides on the outside of the outer tube. The core extrusion tube has a movably arranged core extrusion tube and a core extrusion cap fitted into the grip part, and the core extrusion tube is slid by the cap to push the core storage tube. A sharpening pencil with a rotating eraser holder.