JPH0528073Y2 - - 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 tip 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.

To combine the rotary eraser holder with a sharp pencil, the rotary eraser holder is placed at the end of the sharp pencil lead storage cylinder (the side where the eraser of a general sharp pencil is attached), and the lead can be removed by pushing the end of the lead storage cylinder with the rotary eraser holder (for example, the tip surface of the spring guide rod 1 of the one shown in Figure 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.

This invention is equipped with a sharpening pencil part and a rotating eraser holder part, and it is possible to perform centering operation by pushing the lead storage cylinder in the sharpening pencil part without moving the inner cylinder in the rotating eraser holder part into the outer cylinder. To provide a sharpening pencil with a rotating eraser holder.

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 the first embodiment of the present invention, and Fig. 3 is an exploded perspective view of the above embodiment. It has a grip part made of a cylindrical body 12'', a core extrusion part 13 screwed thereto, a flange 14a housed inside the grip part, and a male thread 14 on its outer peripheral surface.
a chuck outer cylinder 14 having a cylindrical shape as a whole, and a core storage cylinder 1 located inside the grip part 12 and whose tip is integrally connected to the chuck 16.
5, a floating ring 17 located around the chuck 16, and a core portion 19 having a core tube 18 at its tip and screwed into the chuck outer tube 14.
and a core presser spring 20 provided between the flange 14a of the chuck outer cylinder 14 and the flange 15a of the core storage cylinder 15.

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 of the present invention will be described. In Figures 2 and 3, 21 is a spring guide rod, 22 is a spring, 23 is an inner cylinder, 24 is an outer cylinder, 25 is an eraser restraining ring attached to the rear end of the inner cylinder 23, and 26 is an eraser. , these constitute a rotating eraser holder section. Also, 2
8 is a core extrusion cap fitted inside the end of the grip portion 12, and 29 is a removable outer cylinder fixing claw attached to the grip portion 12.

The operation of the sharpening pencil with a rotating eraser holder as described above will be explained. The outer cylinder 24 also has a spirally formed internal thread 24a that connects the inner cylinder 2.
3 is formed with a male thread 23a that engages with a female thread 24a, and this inner cylinder 23 is normally held in the position shown in FIG. 2 (the rightmost position) by the force of the spring 22.
It is in. When the eraser 26 is pushed to the left, the inner cylinder 23 moves against the force of the spring 22 and simultaneously rotates. That is, it operates exactly the same as the rotating eraser holder shown in FIG.

In addition, in the sharp pencil of this embodiment, as mentioned above, the grip part is divided into two parts 12' and 12'', of which 12'' is rotatable. By forming an elongated groove 24c extending in the axial direction into which the tube fixing claw 29 can be inserted, and pushing the core extrusion cap 28 so that the tip of the core extrusion cap 28 comes into contact with the outer tube 24, the outer tube 24 is removed. It has a structure that allows it to be moved.

In this embodiment, the outer cylinder fixing claw 29 is attached to the groove 2.
When it is at position 4c, the outer cylinder 24 is moved by pushing the core extrusion cap, which in turn pushes the core storage cylinder 15 and moves it, thereby performing a centering operation.

Next, rotate the grip part 12'' to remove the outer cylinder fixing claw 29.
If you move it and shift it from the position of groove 24c,
The outer cylinder 24 cannot be moved by the outer cylinder fixing claws 29. In this state, hold the core extrusion cap 28 into the grip part 1.
2" and press the eraser 26 against the surface of the paper. As mentioned above, the outer cylinder 24 cannot be moved by the outer cylinder fixing claws 29, so only the inner cylinder 23 moves. This causes the inner cylinder 23 to move. As the eraser 26 rotates, it rotates while being pressed against the surface of the paper, thereby performing the letter erasing operation.During this letter erasing operation, the outer tube 24 is not fixed in the rotational direction.However, due to the force in the axial direction, It is pressed against the outer cylinder fixing claw 29 and the end face of the core storage cylinder.Therefore, the rotation of the inner cylinder 23 applies a slight rotational force to the outer cylinder 24, but the outer cylinder 24 hardly rotates.This character erasing operation In order to reliably prevent rotation of the outer cylinder 24 during this process, a shallow recess may be provided in the outer cylinder 24 in addition to the groove 24c.This recess serves to supplement the rotation prevention caused by the above-mentioned pressing force. An extremely shallow recess is sufficient. Therefore, the recess does not make it impossible or impede the rotation of the grip portion 12'' for switching between centering and erasing operations.

FIG. 4 shows another second embodiment, in which the outer cylinder fixing claw 2
9' is provided at another position on the grip portion, and an L-shaped groove 24C' is provided at a corresponding position on the outer cylinder 24.

In this embodiment, the outer cylinder fixing claw 29' is attached to the outer cylinder 24.
When the outer cylinder fixing claw 2 of the outer cylinder 24 is located in the part extending parallel to the axis of the L-shaped groove 24C',
Since the fixation by 9' is released, the centering operation can be performed in the same manner as in the embodiment shown in FIG.
Furthermore, when the grip portion 12'' is rotated so that the outer cylinder fixing claw 29' is positioned in the groove extending in the circumferential direction of the L-shaped groove 24c' of the outer cylinder 24, the outer cylinder 23 is moved into the outer cylinder fixing claw 29. Therefore, the character erasing operation can be performed in the same way as in the embodiment shown in FIG.

FIG. 5 is a cross-sectional view of a portion of a third embodiment of the present invention. In this embodiment, the grip portion 12 is provided with an outer cylinder fixing claw 29'' having spring properties, and the outer cylinder 24
has a recess 24 into which the tip of this claw 29'' is inserted.
c″ is formed.And the core extrusion cap 28
When the cap 28 is inserted into the grip portion 12, the cap 28 pushes the outer tube fixing claw 29'' having a spring property, and the tip of the cap 28 is removed from the recess 24c''. If the core extrusion cap 28 is pushed in this state, the core extrusion cap 28 will push the outer cylinder 24 and a centering operation will be performed. When the core extrusion cap 28 is removed, the state shown in the figure is achieved, and the tip of the outer cylinder fixing claw 29'' having spring properties is inserted into the recess 24c'' of the outer cylinder 24, and the outer cylinder 24 is fixed. In this state, an erase operation can be performed.

Among the structures shown in each of 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 each embodiment, the sharpening pencil with a rotating eraser holder of the present invention can be centered by pressing the lead extrusion cap in the same way as a general sharpening pencil, and moreover, This operation can be performed without the inconvenience of a large amount of movement or rotation. 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, Fig. 2 is a cross-sectional view of a first embodiment of a sharpening pencil with a rotating eraser holder of the present invention, and Fig. 3 is a cross-sectional view of the above-mentioned embodiment. FIG. 4 is a sectional view showing a part of the second embodiment, and FIG. 5 is a sectional view of the third embodiment. 15... Core storage cylinder, 23... Inner cylinder, 24... Outer cylinder, 26... Eraser, 28... Core extrusion cap,
29, 29', 29''...Outer cylinder fixing claw.

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 part consisting of an inner cylinder with an eraser attached to its rear end; It has a cylinder fixing claw and a core extrusion cap that is fitted into the grip part, and is configured to release the prevention of sliding of the outer cylinder by the fixing claw and cause the cap to slide the outer cylinder and push the core storage cylinder. A sharp pencil with a rotating eraser holder.