JP2551407Y2 - Extension type eraser device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a so-called feed-out type eraser device which is disposed at the rear end of a writing instrument and rotates to feed an eraser.

[0002]

2. Description of the Related Art Conventionally, there has been known a mechanical pencil in which a cap is rotated with respect to a front shaft to feed a large-diameter eraser from a rear end, and a rear end is knocked with respect to the front shaft to feed a core. However, in this case, since the rear end is knocked together with the consumption of the core, when writing or erasing is frequently performed, there is a trouble that the eraser which is protruded when knocking is stored in the cap. (If you knock in the protruding state, your finger gets dirty, or the oil of your finger is transferred to the end surface of the eraser, causing problems that the erasing property is deteriorated.)

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a feed-out type eraser device according to the present invention is provided with a slit at a rear end and a rear end at an inner hole of a cap having a spiral groove in the inner hole. Equipped with an inner cylinder having a crown and a shaft in front, a cap is provided on the inner cylinder so as to be rotatable and movable in the axial direction within an appropriate range, and an eraser is fixed to the inner cylinder. The holder is freely movable back and forth, and the protrusions provided on its side are fitted into the slit and the spiral groove, respectively, and the shaft of the inner cylinder is joined integrally with the front shaft in the rotation direction. Is capable of protruding and retracting from the rear end of the crown, and by moving the cap forward from a state in which the eraser protrudes appropriately from the rear end of the crown, the rear end of the eraser is retracted from the rear end of the crown. It is composed of

[0005]

1 and 2 show an embodiment of the present invention. First, the feed-out type eraser device has a cap 4,
The cap 4 is formed by combining members of an inner cylinder 9 and an eraser holder 18, and the cap 4 is formed with a stepped portion 6 having an inner hole fitted to the outer periphery of the rear end of the front shaft 1 and a projection 7. The portion has a clip 8 and a spiral groove 5 is formed on the inner surface. Further, the inner cylinder 9 has a crown portion 10 which comes into contact with the rear end surface of the cap 9 at the rear end together with a hole through which the eraser 20 is inserted,
A long slit 11 is formed substantially from the center toward the crown. In addition, a shaft portion 16 is integrally provided with the rear end hole of the front shaft 1 in the rotation direction in the front, and the inner hole of the shaft portion 16 is appropriately engaged with the lead case 2 of the mechanical pencil. The partition 17 is provided with a groove 17 and abutting against the rear end of the core case 2.
5 are provided. Further, a flange 14 and a groove 13 and a groove 12 are further formed on the rear outer periphery of the shaft 16.
The eraser holder 18 has a bottomed hole at the rear end for fixing the rear end of the eraser 20, and a projection 19 is provided on the outer peripheral portion at the front end.

The eraser holder 18 is elastically fitted from the slit 11 of the inner cylinder 9 to fit the projection 19 into the slit, and the inner cylinder 9 is inserted into the spiral groove 5 from the rear end of the cap 4. The projection 7 is inserted into the groove of the shaft portion while the crown portion 10 is in contact with the rear end of the cap 4 by elastically positioning the collar portion 14 in front of the step portion 6 of the cap. 12 to be engaged. That is, the cap 4 is rotatable and axially movable with respect to the inner cylinder 9 between the crown portion 10 and the brim portion 14 and is prevented from falling off. An eraser 20 is fixed to the rear end of the eraser holder 18, the shaft 16 of the inner cylinder is stopped from rotating at the rear end hole of the front shaft 1, and further fixed to the core case 2.

A writing element of a mechanical pencil is provided in front of the front shaft 1 so as to extend the lead in conjunction with the forward / backward movement of the lead case 2. Since the structure is not the gist of the present invention, the description is omitted. Also, in the embodiment of the present invention, a feed-out type eraser device arranged at the rear end of the mechanical pencil writing instrument was shown, but as a writing instrument, a ballpoint pen whose writing tip protrudes from the shaft tip by knocking on the rear end is also applied. You. At that time, instead of the eraser, a solid correcting agent or the like that makes the ballpoint pen ink erasable is attached. In the case of a rubber latex type erasable ballpoint pen, an eraser is attached.

[0008]

First, when the cap 4 is rotated left and right with respect to the front shaft 1 in the state shown in FIG. 1, the eraser 20 comes out of the rear end hole of the crown 10. When the cap 4 is slid forward with respect to the front shaft 1 with the eraser 20 protruding as shown in FIG.
The engagement between the projection 7 of the cap and the groove 12 of the shaft 16 is released,
The step 6 comes into contact with the flange 14 and the projection 7 engages with the groove 13, so that the rear end of the eraser 20 is placed on the crown 1 as shown in FIG.
0 immersed in the rear end hole. If the rear end of the crown 10 is knocked in this state, the core can be extended. By the way, the engagement between the projection 7 of the cap and the grooves 12, 13 of the inner cylinder is not an essential condition, but it is desirable to provide it for the sake of stable operation.
At this time, it is preferable that the resistance of the engagement / disengagement is set to a weak level that does not push the lead case 2 and draw out the lead.

[0009]

[Effects of the Invention] The construction and operation of the feed-out type eraser device of the present invention are as described above, and an appropriate amount of eraser can be made to appear and disappear simply by sliding the cap with respect to the front shaft. The trouble of repeatedly rotating the cap with respect to the front shaft when erasing or erasing frequently is eliminated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a feed-out type eraser device according to an embodiment of the present invention, in which a cap is positioned at the rear and an eraser is projected by an appropriate amount.

FIG. 2 is a longitudinal sectional view of a main part showing a state in which an eraser is immersed with a cap positioned forward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front shaft 2 core case 3 Engagement projection 4 Cap 5 Spiral groove 6 Step 7 Projection 8 Clip 9 Inner cylinder 10 Crown part 11 Slit 12 Groove 13 Groove 14 Flange part 15 Partition part 16 Shaft part 17 Engagement groove 18 Eraser holder 19 Projection 20 Eraser

Claims (1)

(57) [Scope of request for utility model registration] 1. A dispensing type eraser device provided at a rear end of a front shaft having a writing portion at a front end, wherein the dispensing type eraser device has an inner hole of a cap having a spiral groove in an inner hole. An inner cylinder having a slit at the rear and a crown at the rear end, and a shaft having a shaft at the front is mounted, and a cap is provided for the inner cylinder so as to be rotatable and movable in the axial direction within an appropriate range. An eraser holder with an eraser fixed in the inner hole of the cylinder can move back and forth, and the protrusions provided on its side are fitted into the slit and the spiral groove, respectively, and the shaft of the inner cylinder is integrated with the front shaft in the rotation direction. By joining, when the cap is rotated with respect to the front shaft, the eraser can appear and disappear from the rear end of the crown, and by moving the cap forward from the state where the eraser protrudes appropriately from the rear end of the crown, The rear edge of the eraser sinks from the rear edge of the crown A feed-out type eraser device characterized by being configured as described above.