JPH1091U - Extension type eraser device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] The eraser indentation hole is closed when not in use to prevent the attachment of dust and the deterioration of the eraser, and to improve the appearance. [Structure] A spiral groove is provided in the inner hole of a cap formed by combining two members, and a guide groove is formed outside the spiral groove. The eraser retractable hole can be opened and closed by the forward and backward movement of the shutter, and an inner cylinder having a slit at the rear and a shaft at the front is inserted inside the spiral groove, and the cap is fitted to the integral cylindrical body. The inner cylinder is rotatable with respect to the cap and is prevented from falling off. An eraser holder is provided in the inner hole of the inner cylinder so as to be able to move back and forth, and the projection is fitted into the slit and the spiral groove. Is integrally joined to the front shaft in the rotation direction, and when the eraser projection hole is in an open state, the eraser can be retracted by rotating the cap with respect to the front shaft.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a so-called dispensing type eraser device which is disposed at a rear end of a writing instrument and which rotates to eject an eraser.

[0002]

[Prior 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 out with respect to the front shaft to feed out a core. In the conventional one, a large-diameter crown is formed at the rear end of the inner cylinder having a slit, and an eraser holder having a projection on the side surface is fitted into the inner cylinder from the slit. The cap has a spiral groove in the inner hole from the rear end, and a step in the front end inner hole. While rotating the inner cylinder from the rear end of the cap as appropriate, insert the protrusion of the eraser holder into the spiral groove and insert it. The protrusion of the elastic piece provided on the side surface of the cap is locked to the step of the inner hole of the cap, or the ring is press-fitted and fixed to the shaft and locked to the step, and the cap is sandwiched between the crown and the step. Wear it and rotate the inner cylinder against the cap to keep it from coming off. By the way, in the conventional one, the rear end hole is always in the open state, so that dust adheres to the eraser, the residue of the eraser spills out, and the eraser deteriorates because it is exposed. There is. In addition, there is a problem that the appearance is bad because the eraser is exposed.

[0003]

[Problems to be solved by the invention]

 An object of the present invention is to solve the above-mentioned problems of the conventional example.

[0004]

[Means for Solving the Problems]

 The extension type eraser device of the present invention devised to achieve the above object has a spiral groove in an inner hole of a cap formed by combining two members, and a guide groove is formed outside the spiral groove. In the guide groove, a belt-shaped shutter that is linked to the operating body protruding from the outer periphery of the cap is fitted so as to be movable back and forth, and the eraser hole at the rear end of the cap can be opened and closed by the forward and backward movement of the shutter. An inner cylinder having a slit at the rear and a shaft at the front is inserted inside the spiral groove, the inner cylinder is rotatable with respect to the cap and is prevented from falling off, and the inner hole of the inner cylinder is made of an eraser. An eraser holder with projections on the side of the clamping part and the front cylinder part can move back and forth, fit the projections into the slits and spiral grooves, and join the shaft part of the inner cylinder integrally with the front shaft in the rotation direction. With the eraser hole set to the open position, and Wherein the eraser is configured to be retractable et or eraser infested hole of the cap rear end when rotated up.

[0005]

【Example】

 1 to 3 show an embodiment of the present invention. First, the extension type eraser device is configured by combining members of a cap 4, an inner cylinder 14, and an eraser holder 23, and the cap 4 is provided so as to form a cylinder by combining two half-cylindrical members. Fitting holes 13a to 13g are appropriately provided at required positions on one mating surface, and mating projections (not shown) are formed on the other mating surface so as to mate with the mating holes and form an integral cylindrical body. ) Is provided. Further, the cap 4 has an inner hole 6 and a concave groove 7 which are fitted on the outer periphery of the rear end of the front shaft 1, and a spiral groove 5 is formed behind the concave groove 7. An eraser protrusion hole 12 having an inclined contact portion 8 and opened at the rear end is provided. A slit-shaped guide groove 10 is formed on one outer side of the spiral groove 5, and a bent portion 10 の of the guide groove is provided near the eraser protrusion hole 12 at the rear end. On one side of the cap 4, a cut window 9 formed by a mating surface is formed in parallel with the guide groove 10 in the axial direction.

The inner cylinder 14 has an inclined rear end 16 substantially in contact with the contact portion 8 of the cap 4 together with a hole through which the eraser 28 is inserted. A long slit 15 is bored toward 16. A shaft 18 is integrally provided in the front with the rear end hole of the front shaft 1 in the direction of rotation. The outer periphery of the lead case 3 of the mechanical pencil is appropriately fixed to the inner hole of the shaft 18. Further, a partitioning portion 19 is provided which comes into contact with the rear end of the lead case 3. A flange 17 is provided on the rear outer periphery of the shaft 18 so as to fit into the concave groove 7 of the cap. Further, the eraser holder 23 has a pair of elastic pieces 26 sandwiching one end of the eraser 28 at the rear and a locking projection 27 on the inner surface of the elastic piece 26 which bites into the outer surface of the eraser 28. Has a pair of projections 25 formed on the same axis as the elastic piece 26.

The eraser holder 23 is fitted into the inner hole of the inner cylinder 14 from the rear end of the slit 15 to fit the projection 25 and the elastic piece 26 into the slit. The eraser 28 is fixed, and the inner cylinder 14 is inserted into one half cylinder of the cap 4 so that the flange 17 is fitted into the concave groove 7. At this time, the projection 25 is fitted into the spiral groove 5 with the front end of the eraser holder 23 abutting on the step portion 14 # at the slit front end of the inner cylinder 14. Further, the shutter 22 of the operating body 20 is fitted in the guide groove 10. The operating body 20 is formed integrally with a band-shaped shutter 22 that is elastically displaceable and bendable below the base 21 # of the clip 21. The side of the base 21 # (which may be formed separately) is formed by the side of the cap. The rear part of the shutter 22 slides in the guide groove 10 by the front and rear movement of the operating body 20 by being fitted into the incision 9 and can be opened and closed by opening and closing the eraser projection hole 12 by being deformed by the bent part 10 °. Become.

In this state, the other half cylinders are fitted together and fitted to the integral cap cylinder. As described above, the inner cylinder 14 is rotatably stopped with respect to the cap 4, and the shaft portion 18 of the inner cylinder 14 is stopped from rotating at the rear end hole of the front shaft 1 and is fixed to the core case 3. Although the cylindrical portion of the inner cylinder 14 having the slit 15 is delicate and easily deformed, the inward deformation is prevented by the engagement of the inclined contact portion 8 and the rear end portion 16, which stabilizes after mounting. You.

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 3. Since the structure is not the gist of the present invention, the description is omitted. Also, in the embodiment of the present invention, the extension type eraser device provided at the rear end of the sharp pencil writing instrument was shown, but as a writing instrument, a ballpoint pen whose writing tip protrudes from the shaft tip due to knocking at the rear end can also be applied. It is. At that time, instead of the eraser, a solid correction agent, etc., that can erase ballpoint pen ink is attached. If a rubber latex pen is used, an eraser is attached.

[0010]

[Action]

 First, as shown in FIG. 1, when the operating body 20 is slid forward, the eraser retracting hole 12 is opened. When the cap 4 is rotated left and right with respect to the front shaft 1 in this state, the eraser 28 comes out of the eraser hole 12. By knocking the rear end of the cap 4 with the eraser 28 immersed, the core can be extended. When the eraser has been consumed and the eraser holder 23 has reached the rear end of the cap 4, a new eraser is replaced. In addition, when the portable device is carried, when the eraser 28 is immersed and the operating body 20 is slid backward, the shutter 22 slides to close the eraser projection hole 12.

[0011]

[Effect of the invention]

 The configuration and operation of the feed-out type eraser device of the present invention are as described above, and the eraser projection hole is closed when not in use, so that there is a problem that dust adheres to the eraser and eraser residue spills out. In addition, since the eraser is not exposed, the problem of deterioration can be prevented. Also, the appearance of the eraser hole is closed because the hole is closed.

[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 projected in an appropriate amount.

FIG. 2 is a vertical sectional view of a main part showing a state in which an eraser is stored and an eraser projection hole is closed by a shutter.

FIG. 3 is a view seen from the rear of the cap, and shows a state in which two cap half-cylinders are combined to form an integral cap cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front shaft 2 Inner hole 3 Core case 4 Cap 5 Spiral groove 6 Inner hole 7 Concave groove 8 Contact part 9 Cutout window 10 Guide groove 10 ｀ Bending part 11 Step part 12 Eraser rubbing hole 13a-g Fitting hole 14 Inner cylinder 14 ｀ Step 15 Slit 16 Rear end 17 Flange 18 Shaft 19 Partition 20 Operation body 21 Clip 21 ｀ Base 22 Shutter 23 Eraser rubber holder 24 Cylindrical part 25 Projection 26 Elastic piece 27 Locking projection 28 Eraser

Claims (1)

[Utility model registration claims] 1. A feed-out type eraser device provided at a rear end of a front shaft having a writing portion on the front side, wherein the feed-out type eraser device is an inner hole of a cap formed by combining two members. A spiral groove is provided.A guide groove is formed outside the spiral groove, and a belt-shaped shutter interlocking with an operating body protruding from the outer periphery of the cap is fitted in the guide groove so as to be movable back and forth. The eraser hole at the rear end of the cap is openable and closable, and an inner cylinder having a slit at the rear and a shaft at the front is inserted inside the spiral groove, and the inner cylinder is rotatable with respect to the cap and can be removed. It is stopped, and an eraser holder having an eraser clamping portion and a projection on the side surface of the front cylinder portion is further movable in the inner hole portion of the inner cylinder so that the projection can be fitted into the slit and the spiral groove, and The shaft is integrally joined to the leading shaft in the rotation direction, A feeding-type eraser device, wherein the eraser retracting hole is in an open state, and the eraser is configured to be able to emerge from an eraser retracting hole at the rear end of the cap when the cap is rotated with respect to the front shaft.