JPH0415512Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a sharpening pencil knob body equipped with a lead hardness display device that can appropriately select the hardness display of the lead used.

(Prior art and its problems) Among sharp pencils, especially sharp pencils for drafting, leads of various hardnesses are used for drafting, so the lead hardness allows the hardness display of the lead to be used to be appropriately selected. It is desirable to have a display device, and in consideration of compatibility with other sharp pencils, it is preferable that the display device be installed in a notch body that is removably fitted into the lead tank.

As such a lead hardness display device, for example, as disclosed in Japanese Utility Model Application Publication No. 56-48692, a rotating body having a display window is rotatably fitted into a cylindrical body fitted to the rear end of a lead tank. However, by rotating the rotating body relative to the cylindrical body, a desired hardness display is exposed from the display window.
As disclosed in Japanese Patent No. 105184, a rotating body having a display window is fitted between a cylindrical body that fits into the rear end of the core tank and a presser member that is fitted and fixed to the rear end of the cylindrical body. There is known a device in which a desired hardness display is exposed from the display window by rotating the rotating body with respect to the cylindrical body.

However, in the above-mentioned hitch body equipped with the conventional lead hardness display device, each time a pressing operation is performed when the lead is fed out, it is applied to the fitting part of the rotating body in the former case, and to the fitting part of the holding member in the latter case. Since each of these parts has a structure that is easily subjected to loads, these parts deform as they are used, resulting in problems in that the rotation of the rotating body having the display window is hindered.

(Purpose of the invention) The present invention was devised in view of the conventional problems, and it is possible not only to select the desired lead hardness display as appropriate, but also to enable the display of a rotary body with a display window by a pressing operation when feeding out the lead. It is an object of the present invention to provide a mechanical pencil knob body that is equipped with a lead hardness display device that does not interfere with rotation.

(Summary of the invention) The present invention consists of a base cylinder having a plurality of core hardness indications on the outer surface of the intermediate part and a pillar part having a flange at the center of the rear end, which is fitted into the pillar part of the base cylinder. A rotating body having a hole into which the core hardness can be inserted at the center of the rear end, an engaging portion on the inner surface of the hole that can be engaged with the collar, and a display window capable of exposing the core hardness display on the outer surface of the intermediate portion. The rotating body is rotatably disposed in the base tube by fitting the column into the hole and engaging the engaging portion with the collar with the rear end surface exposed from the hole. The gist of this invention is a mechanical pencil with a hardness indicator.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the accompanying drawings.

1 to 3, reference numeral 1 is a cylindrical body detachably fitted to the rear part of a core tank 3 which is slidably disposed within a shaft cylinder 2. As shown in FIGS. 4 is the cylinder 1
This is a base tube that is externally fitted and fixed to the rear part of the base tube 4.
A plurality of core hardness indicators 5 such as B, HB, and H are attached to the outer surface of the intermediate portion of the core at appropriate intervals in the circumferential direction by pasting a sticker or hot stamping.
Further, a pillar portion 7 having a flange 6 is integrally provided at the center of the rear end portion of the base cylinder 4 in a protruding manner. 8 is a cylindrical rotating body having a hole 9 at the center of the rear end and an engaging part 10 on the inner surface of the hole 9. The engaging portion 10 is engaged with the front end of the collar 6 with its end surface exposed through the hole 9, and is rotatably disposed in the base tube 4. In the illustrated example, so that the engaging portion 10 of the rotating body 8 can be easily engaged with the collar 6 of the base cylinder 9,
Although an inclined surface 10a is shown provided at the front end of the engaging portion 10, the inclined surface 10a may be provided at the rear end of the collar 6. Further, the rotating body 8 has a display window 11 on the outer surface of the intermediate portion that can expose the core hardness display 5.
have.

Above, an example in which the cylinder body 1, the base cylinder 4, and the rotating body 8 constitute the knob body N has been described in detail. It should be noted that the cylindrical body 1 does not necessarily need to be used if possible. Also, even with such a configuration, it is possible to expose the desired core hardness display 5 from the display window 11 of the rotating body 8 by rotating the rotating body 8 with respect to the base tube 4. Next, a suitable means for rotating the rotating body 8 stepwise at predetermined angles with respect to the base cylinder 4 will be explained.

There are a plurality of pieces (6 in the figure) on the outer surface of the front part of the base cylinder 4.
) rotation guide protrusion 12 at a predetermined angle (60° in the figure).
A plurality of engagement grooves 13 are formed on the circumference at intervals, and on the inner surface of the front part of the rotating body 8, a plurality of engagement grooves 13 into which the rotation guide protrusions 12 are fitted are formed, corresponding to the formation positions of the rotation guide protrusions 12. 3 pieces in the figure) are formed. In the illustrated example, two rotation guide protrusions 12 can be fitted into the engagement grooves 13 of the rotating body 8, but the number of engagement grooves 13 is the same as the number of rotation guide protrusions 12. In short, as long as the rotating body 8 can be rotated in steps at predetermined angles according to the number of core hardness indicators 5 with respect to the base cylinder 9, and the core hardness indicators 5 can be exposed through the display window 11. good.

If such a means is adopted, the rotation of the rotating body 8 with respect to the base cylinder 4 will cause the rotation guide protrusion 1 to move into the engagement groove 13.
2 can be unfitted, and then the rotation guide protrusion 12 can be fitted into the adjacent engagement groove 13. Therefore, the rotor 8 can be inserted into the base cylinder 4 in accordance with the formation position of the rotation guide protrusion 12. On the other hand, it can be rotated stepwise to a predetermined angle, and a desired core hardness display 5 can be exposed from the display window 11.

(Effect of the invention) As described above, in the present invention, by rotating the rotating body with respect to the base cylinder, it is possible to expose the desired core hardness display from the display window of the rotating body. is rotatably arranged in the base cylinder with the rear end surface of the column part of the base cylinder exposed through the hole, so even if a pressing operation is applied to the knock body when feeding out the lead, the pressing force will be the same as that of the rotating body. Since the load transmitted to the base cylinder exposed from the rear end and applied to the fitting and engaging portions of the rotating body can be prevented as much as possible, the rotation of the rotating body can be maintained satisfactorily over a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along line A--A in FIG. 1, and FIG. 3 is a side view of FIG. 1. 4...Base cylinder, 5...Core hardness display, 6...Tsuba, 7
... Pillar part, 8 ... Rotating body, 9 ... Hole, 10 ... Engagement part, 11 ... Display window, 12 ... Rotation guide protrusion,
13...Engagement groove.

Claims (1)

[Scope of utility model registration request] a base cylinder having a plurality of core hardness indications on the outer surface of the intermediate portion and integrally protruding from a pillar portion having a flange at the center of the rear end;
It has a hole in the center of the rear end that can fit into the pillar part of the base cylinder, a rotation guide protrusion on the front outer periphery of the base cylinder, and an engaging part that can engage with the collar on the inner surface of the hole. and a display window capable of exposing the core hardness display on the outer surface of the intermediate portion, and a rotating body having an engagement groove in front that engages with the rotation guide protrusion, and the rotating body is connected to the column. A sharpening pencil with a lead hardness indicator, characterized in that the engaging part is fitted into a hole, the engaging part is engaged with a collar with the rear end surface exposed from the hole, and the engaging part is rotatably arranged in a base barrel. Notsuku body.