JPH0432315Y2 - - Google Patents

Description

[Detailed description of the invention] 〓Field of industrial application〓 This invention relates to a sharp pencil.

〓Prior art〓 There are various types of pencils as writing lead supply mechanisms, such as those that supply the writing lead by rotation, those that slide through a vertical long hole, and those that use a chuck. An eraser is fitted on the opposite end of the writing lead to the end that is used to erase mistakes made when writing.

〓Problem that the invention aims to solve〓 Conventional sharpening pencils have an eraser attached to the end opposite to the drawing end of the writing lead, so each time you want to erase a mistake, turn the sharpening pencil 180 degrees. When the eraser rotates and a cap is attached to the eraser, the user is forced to remove the cap and erase the eraser, then rotate the eraser 180 degrees again to continue writing, which is inconvenient and slows down the writing speed.

This invention was made with the aim of solving such inconvenience.

〓Means for solving the problem〓 The mechanical pencil of this invention has a shaft shell and a holding tube for holding a writing lead insertion tube provided in the shaft shell. A cylindrical eraser is slidably inserted into the holding tube so as to be positioned in the space formed by the holding tube, and the eraser and the shaft shell are provided with a feeding and retracting mechanism, thereby solving the above problem. Settled.

〓Operation〓 As mentioned above, the sharpening pencil of this invention is equipped with an eraser at the end of the writing lead, and is equipped with a mechanism for feeding out and pulling back the eraser. You can pull this back and continue writing.

〓Example〓 An example of the sharp pencil of the present invention will be described below, using a type in which the writing lead is drawn out by pushing the head of the shaft. However, the present invention is not limited to the above-mentioned type. Of course, any type of writing lead feeding mechanism may be used.

Referring to FIG. 1, reference numeral 1 denotes the shaft shell of the sharp pencil of this invention, which can be freely separated into two parts 1a and 1b by means of a threaded portion 2. The inside of the shaft shell 1 is provided with a known writing lead feeding mechanism 5 for drawing out the writing lead housed inside from the writing lead insertion tube 4 by pushing the head 3 of the shaft.

6 is a holding tube that covers the 4 parts of the writing lead insertion tube;
A cylindrical eraser 7 is provided between the holding tube 6 and the shaft shell 1 by inserting the holding tube 6 into the center hole. It is configured so that it can be drawn out from the end and pulled back into the shaft shell 1.

Details of the mechanism will be explained next with reference to FIGS. 2 to 5.

Slits 10 having bulges 9 at regular intervals are provided in the shaft shell 1a on the writing lead feeding end side of the sharp pencil of the present invention, and the slits 10
has a sliding part 11 that freely slides inside the slit 10.
and a bottom portion 1 that fits into the bulge 9 of the slit 10.
2 and a push button 8 having a cross-sectional shape consisting of a head 13 slightly larger than the bulge 9 is fitted. The lower surface of the bottom part 12 of the push button 8 is provided with an inverted V which is folded in half and has a biasing force in the opening direction.
An eraser 7 is fixed via a letter-shaped leaf spring 14.

Therefore, as shown in FIGS. 2 and 3, when the push button 8 is fitted into the bulge 9 and the sliding portion 11 is prevented from sliding within the slit 10, the eraser 7 is Although it is placed in a fixed state within the shaft shell 1a, when pressing the push button 8 using the fingertip against the pressure of the leaf spring 14, the fourth
As shown in FIG. 5, the bottom part 12 of the push button 8 comes off the bulge part 9 of the slit 10, and as a result, the sliding part 11 can freely slide forward and backward within the slit 10, and is fixed to the leaf spring 14. The eraser 7 can be moved back and forth to be paid out or pulled back from the shaft shell 1a. Then, by moving the bottom portion 12 of the push button 8 to the bulge 9 at an arbitrary position by the biasing force of the leaf spring 14 and fitting it, the position can be fixed. The mechanism for feeding and retracting the eraser 8 described above is merely an example, and any structure may be used as long as the mechanism does not deviate from the scope of the claims for utility model registration. Of course, there is no problem. Furthermore, when the eraser 8 is used up, it is of course possible to remove it and replace it with a new eraser prepared as a spare. Furthermore, in order to easily and securely secure contact between the leaf spring 14 and the eraser 7, a small protrusion such as a needle may be provided on the contact surface of the leaf spring 14 with the eraser 7, although not shown.

<Effects of the invention> As described in detail above, the sharp pencil of the invention has a shaft shell and a holding tube for holding a writing lead insertion tube provided in the shaft shell. A cylindrical eraser is slidably inserted into the holding tube so as to be positioned in the space formed by the holding tube, and the eraser and the shaft shell are provided with a mechanism for feeding out and pulling back. This method avoids the trouble of rotating the shaft 180 degrees and using an eraser attached to the head each time you erase a mistake, as in the case of a sharpening pencil. The eraser can be drawn out to erase mistakes, and after erasing, the eraser can be returned to the shaft and writing can be continued again.As it has the same external shape as a conventional mechanical pencil, it can be easily held and used without any resistance. However, since the writing lead insertion tube is held by a holding tube, stress during use of the eraser may exert an influence on the writing lead insertion tube, causing the tube to bend, causing the writing lead to break, or even causing the tube to become damaged. It is possible to obtain practical effects such as speeding up the writing speed and quick correction of errors without bending the paper and making it unusable.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention, Fig. 2 is a plan view of the eraser dispensing mechanism of the present invention, Fig. 3 is a partial cross-sectional view taken along the line of Fig. 2, and Fig. 4 is a cross-sectional view of the eraser dispensing mechanism of the present invention. FIG. 5 is a plan view showing another state, and FIG. 5 is a partial cross-sectional view taken along the line of FIG. 4. 1...Shaft shell, 4...Writing lead insertion tube, 5...Writing lead feeding mechanism, 6...Holding tube, 7...Eraser,
8...Push button, 9...Bulge, 10...
...Slit, 11...Sliding part, 12...Bottom, 1
3... Upper part, 14... Leaf spring.

Claims (1)

[Scope of utility model registration request] At the writing lead feeding end of a sharp pencil having a shaft shell and a holding tube that holds a writing lead insertion tube provided in the shaft shell, the holding tube is positioned in a space formed by the shaft shell and the holding tube. A sharp pencil in which a cylindrical eraser is slidably inserted into the cylindrical eraser, and a mechanism for feeding out and pulling back the eraser and the shaft shell is provided.