JPH0425499A - Rotary projecting and retracting apparatus for writing device - Google Patents

Abstract

PURPOSE:To permit a writing instrument such as eraser to be projected and retracted by a simple structure by a method wherein a holder is axially and movably inserted into the rear end part of a writing device, the writing devices such as eraser and writing instrument are attached to the holder, a threaded groove is formed around the outer periphery of the holder and a rotary sleeve having a screw bar engageable with the threaded groove is mounted rotatably between the writing instrument and the holder. CONSTITUTION:A holder 12 is inserted into a receiving part 13 of an inner tank 9 with a long groove 15 thereof in engagement with a projection 14, an engaging edge 24 of a rotary sleeve 23 is engaged with an engaging edge 28 of the receiving part 13 and the rotary sleeve 23 is inserted rotatably into the inner tank 9. When the rotary sleeve 23 is rotated to use this writing instrument, since the holder 12 is restrained from its rotational movement, it is guided by a screw bar 2 and a threaded groove 16 into axial movement, an eraser 20 is projected beyond the rotary sleeve 23, so that it can be used. When the rotary sleeve is rotated reversely, the eraser 20 is retracted into the rotary sleeve 23. The holder 12 is restrained against movement by the contact of the projection 18 with the front end of the rotary sleeve 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotating device for ejecting and retracting a writing instrument such as an eraser from a barrel.

(Prior art) An eraser attached to a writing instrument such as a knock-type mechanical pencil or a rotary mechanical pencil is covered by a cap fitted to the rear of the barrel or a knock cap fitted to the eraser. Since the cap must be removed before use, it is troublesome to have to remove the cap each time it is used, and it is easy to lose the cap. There are also known writing instruments in which the eraser stored in the barrel can be moved out and out of the barrel by rotating the barrel, but in order to draw out the eraser by rotating the barrel, a threaded groove or the like is formed on the inner surface of the barrel. Many of the formed products are troublesome and expensive to manufacture, have a large number of parts, are prone to failure, and are difficult to repair and adjust.

(Problems to be Solved by the Invention) An object of the present invention is to provide a rotary ejecting and retracting device that allows a writing instrument such as an eraser to be ejected and retracted with a simple structure without the conventional complicated structure.

(Means for Solving the Problems) According to the present invention, a holder is fitted to the rear end of a writing body such as a knock-type mechanical pencil so as to be movable in the axial direction, and a writing instrument such as an eraser or a writing instrument is attached to the holder. A rotating retractable device M for a writing instrument is provided, in which a thread groove is formed on the outer periphery of the holder, and a rotating sleeve having a thread that engages with the thread groove is rotatably attached between the writing body and the holder, The purpose is achieved.

(Function) When the rotary sleeve is rotated, the holder is guided by the threads and grooves and moves in the axial direction, and a writing instrument such as an eraser can be used by protruding to the rear of the barrel. By rotating the rotary sleeve in the opposite direction, the eraser is stored in the barrel.

(Example) The rotating device for retracting and retracting a writing instrument of the present invention is mainly applied to an eraser as a writing instrument, but it can also be applied to a rotating device for retracting and retracting a ballpoint pen, mechanical pencil, or other writing instrument instead of an eraser. An embodiment in which the eraser appears and disappears will be described below.

In the present invention, the writing body stored in the barrel (1) can be a ballpoint pen, a mechanical pencil, an automatic ATB type mechanical pencil, or any other suitable type of writing. An example of application to a mechanical pencil is shown. In the figure, a ↓ sea urchin cap (3) protruding from the shaft tube (1) is fitted in front of the connector (2) which is press-fitted, screwed or otherwise fixed into the shaft tube (1). There is a lead core (4) inside the cap (3).
A breaker (5 pins) made of elastic material is provided to hold the lead core.A lead core feeding mechanism is attached to the connector (2).In other words, a chuck (7 pins) is installed in front of the stepped portion (6). ) and the fastener (8) are attached, and the chunk (
A core tank (9) is fixed to the rear of the connector (7), and a spring α is installed between the core tank (9) and the stepped portion (6) of the connector (2).
Q is provided. The core tank (9) has a polygonal outer shape as shown in Fig. 3, and is fitted into the polygonal mounting hole 0υ of the connector (2) so as to be movable in the axial direction. It is fitted.

Note that the groove, the protrusion, and other appropriate structures can prevent rotation so as to be movable in the axial direction.

A storage portion 4 is formed at the rear end of the core tank (9) so that a holder □□□, etc. can be fitted therein (see Fig. 3).

The holder (6) is prevented from rotating so as to be movable in the axial direction.
In order to form a chrysanthemum (Figs. ≠ and 5), a long groove OG is provided in the holder (Fig. 6), and the long groove OG is fitted so that the protrusion 0 engages with the long groove (2). and a protrusion may be formed on the opposite member.

The above-mentioned holder has a threaded groove (4) on the outer periphery, the tip is divided into two with a slit αη, and a protruding side is formed to prevent removal. Eraser □□
□ is fitted, and a through hole Qη is formed inside so as to communicate with the core tank (9).

The thread (
The rotating sleeve (to) with A) formed on its inner surface has a locking edge at the tip as shown in FIG. The receiving portion α1 of the holder is formed so that it can slide until the two come into contact with each other. As shown in FIG. 2, a ring piece is fitted to the rear end of the rotating sleeve.

Then, while slightly bending the tip of the slot 9504 of the holder (2) inward, the thread 4 of the rotating sleeve 4 is engaged with the thread groove (4) beyond the protrusion (end) of the holder. Then, assemble the holder 4 and the rotating sleeve (to) (Fig. ξ).

After assembling in this way, the long groove 0 of the above holder
Insert the cap into the storage part (to) of the wick tank (9) with the cap engaged with protrusion α4, and insert the locking edge (c) of the rotating sleeve into the locking edge (c) of the storage part (to). , and the rotary sleeve (g) is rotatably fitted into the wick tank (9).

In use, when the above-mentioned structure is used, when the rotating sleeve is rotated, the holder is prevented from rotating, so it moves in the axial direction while being guided by the thread (a) and the thread groove (to). However, the eraser (A) protrudes from the rotating sleeve 4 and can be used. When turned in the opposite direction, the eraser (4) is stored in the rotating sleeve (a). Furthermore, the movement of the holder is limited because the protrusion Qal touches the front end of the rotating sleeve (O).Also, if you press the rotating sleeve (C), you can press the lead lead (4 ), or
It can be withdrawn. The lead core can be replenished by removing the eraser (1) from the receiving part α9 of the holder □□□.

In the above embodiment, the connector is provided separately from the shaft cylinder, and these are fixed by press-fitting, screwing, or other appropriate means, but it is also possible to extend a portion of the connector to form the shaft cylinder. Moreover, instead of the eraser appearing and appearing, a ballpoint pen or other writing instrument may also appear and disappear.

(Effects of the Invention) The present invention is configured as described above, and the mechanism for ejecting and retracting the eraser etc. is provided in the rear end of the writing body, so the configuration is simple, there are few failures, and there are few parts, so manufacturing and assembly are easy. , and can be assembled by attaching the connector to the shaft cylinder.
It is possible to accommodate a variety of shaft cylinders.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of the distal end, FIG. 2 is a cross-sectional view of the rear end, and FIG. 3 is A of FIG.
- An enlarged cross-sectional view taken along line A, Figure ≠ is a cross-sectional view of the wick tank storage section, Figure 5 is a cross-sectional view taken along line B-B of Figure μ, Figure 2 is a perspective view of the holder, and Figure 7 is a rotating sleeve. Figure g' is a front view of the assembled state of the holder and rotating sleeve. 1... Shaft cylinder, 2°゛・Connector 4... Lead core, 9
... Core tank, 12 ... Holder 13 ... Storage section, 16 ... Screw groove, 20 ... Eraser I7 rubber, 22 ...
...Threaded thread, 23...Rotating sleeve

Claims (1)

[Scope of Claims] 1. A holder is fitted to the rear end of the writing body so as to be movable in the axial direction, a writing instrument such as an eraser or a writing instrument is held in the holder, and a threaded groove is formed on the outer periphery. A rotating and retracting device for a writing instrument, comprising a rotary sleeve having a thread that engages with the thread groove and rotatably attached between the rear end of the writing body and the holder. 2. Fix the connector in the shaft cylinder, attach a lead lead feeding mechanism having a chuck, a fastener, a lead tank, etc. to the connector, and prevent the lead tank from rotating so that it can move in the axial direction into the mounting hole of the connector. A storage part is formed at the rear end of the lead tank, a holder for holding writing instruments such as erasers and writing instruments is fitted in the storage part so as to be movable in the axial direction, and a screw is attached to the outer periphery of the holder. A rotating and retracting device for a writing instrument, comprising a rotating sleeve formed with a groove and having a thread that engages with the threaded groove, and rotatably fitted between the storage portion of the lead tank and the holder.