JP2558803Y2 - 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 out 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]

In order to achieve the above object, a feed-out type eraser device according to the present invention has an inner cylinder having a spiral groove in a rear cylinder part and a shaft part in a front part. An eraser holder having a spiral screw in the front bore of the cylindrical portion and having a gripper for the eraser in the rear, and a cap having a vertical groove and a rear end hole in the rear inner hole, and the eraser holder has a spiral groove. The cap is attached with the spiral screw fitted in the vertical groove, and the cap is fitted to the vertical groove, and the cap is locked to the advance / retreat position with respect to the inner cylinder. When the cap is rotated with the shaft in the direction of rotation and the cap is rotated with respect to the front shaft, the eraser can move out and out of the rear end hole, and the cap is locked from the retracted position where the eraser has entered the rear end hole to the forward position. The eraser can protrude from the rear end hole by an appropriate amount.

[0005]

1 and 2 show an embodiment of the present invention. First, the feeding-out type eraser device of the present application is configured by combining members of a cap 14, an inner cylinder 5, and an eraser holder 22. A locking piece 17 supported by a fulcrum 18 is provided on a side wall of the window 21 provided.
The fulcrum 18 is provided at the rear end with a slightly outwardly protruding button 19 and at the front end with an inwardly protruding locking portion 20. or,
A vertical groove 15 is provided in a side wall of the rear inner hole of the cap 14.

The inner cylinder 5 forms a cylindrical body and has a shaft portion 12 in front of the flange portion 6. Spiral groove 8 is formed. The inner hole of the shaft portion 12 is provided with an engagement groove 13 for appropriately fastening to the lead case 3 of the mechanical pencil, and the rear end of the inner hole of the inner cylinder 5 is in contact with the rear end of the lead case 3. A partition 9 is provided. The outer periphery of the shaft portion 12 is provided with a detent shape which is integrated with the rear end inner hole 2 of the front shaft 1 in the rotation direction.

The eraser holder 22 has an eraser 2 at the rear end.
7 has a piece-like gripping portion 23 for holding the
A spiral screw 25 that fits into the spiral groove 8 of the inner cylinder 5 is provided on the side wall of the inner hole. The core case 3 is mounted in the inner hole of the inner cylinder 5 and the rear end of the core case 3 abuts against the partition portion 9. At this time, the engagement projection 4 provided on the side surface of the core case 3 5 is detachably fitted in the engagement groove 13. Incidentally, as a configuration of the present invention, the relationship between the spiral groove 8 of the inner cylinder 5 and the spiral screw 25 of the eraser holder 22 is also included.

As described above, the inner cylinder 5 is inserted into the inner hole of the cap 14, and the locking portion 20 of the locking piece 17 is fitted and locked in the locking groove 10. Further, the eraser holder 22 is inserted from the rear end hole 16 of the cap 14, and the grip portion 23 is
And the spiral screw 25 of the cylindrical portion 24 is fitted into the spiral groove 8 of the inner cylinder 5 with the rotation of the cap. Further, the eraser 27 is fixed to the grip 23. The core case 3 is fitted into the inner hole of the inner cylinder 5, and the shaft portion 12 is stopped from rotating by the inner hole 2 of the front shaft 1.

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. or,
In the embodiment of the present invention, the extension type eraser device arranged at the rear end of the mechanical pencil writing instrument is shown, but a ballpoint pen in which the writing tip comes out of the shaft tip by knocking on the rear end is also applied as the writing instrument. . 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.

[0010]

First, in the state shown in FIG.
Rotate left and right to eraser holder 2 against inner cylinder 5
2 moves back and forth, so that the eraser 27 protrudes from the rear end hole 16. As shown in FIG. 1, when the eraser 27 is inserted into the rear end hole 16 and the rear end of the cap 14 is knocked, the core is extended. The knock stroke is defined by a gap 26 between the flange portion 6 of the inner cylinder 5 and the rear end of the front shaft 1. In this state, the button 19 is pressed to rotate the locking piece 17 elastically and appropriately to release the locking state of the locking portion 20 and the locking groove 10 and to advance the cap 14 to move the locking portion 20 The locking groove 11
As shown in FIG. 2, the eraser 27 appropriately protrudes from the rear end hole 16 as shown in FIG.

[0011]

[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 an eraser is immersed with a cap positioned rearward.

FIG. 2 is a longitudinal sectional view of a main part showing a state where an eraser is appropriately protruded from a rear end hole with a cap positioned forward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front shaft 2 Inner hole 3 Core case 4 Engagement projection 5 Inner cylinder 6 Flange part 7 Cylinder part 8 Spiral groove 9 Partition part 10 Engagement groove 11 Engagement groove 12 Shaft part 13 Engagement groove 14 Cap 15 Vertical groove 16 Rear End hole 17 Engagement piece 18 Support point 19 Button 20 Engagement part 21 Window part 22 Eraser holder 23 Grip part 24 Tube part 25 Spiral screw 26 Gap 27 Eraser

Claims (1)

(57) [Scope of request for utility model registration] 1. A feed-out type eraser device provided at a rear end of a front shaft having a writing portion at a front end, wherein the feed-out type eraser device has a spiral groove in a rear cylindrical portion and has a forward groove. An inner cylinder having a shaft portion, an eraser holder having a spiral screw in a front bore portion inner hole and having an eraser grip portion in the rear,
It is composed of a cap having a vertical groove and a rear end hole in the rear inner hole, the eraser holder is attached with the spiral screw fitted in the spiral groove of the inner cylinder, and the eraser is fixed to the grip portion, The cap is fitted in a state where the gripping portion is fitted in the vertical groove, and the cap is locked to the advance / retreat position with respect to the inner cylinder, and the shaft of the inner cylinder is integrally formed with the front shaft in the rotation direction. The eraser can come out of the rear end hole when the cap is rotated with respect to the front shaft by joining, and when the cap is locked at the advanced position from the retracted position where the eraser enters the rear end hole, A feed-out type eraser device which is configured to protrude from a rear end hole by an appropriate amount.