JP2592130Y2 - 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. 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 portion is provided in the front end inner hole. From the rear end of the cap, the inner cylinder is inserted by fitting the protrusion of the eraser holder into the spiral groove while rotating appropriately, and with the front end of the crown abutting the rear end of the cap. The protrusion of the elastic piece provided on the side of the cap may be locked to the step of the inner hole of the cap, or the ring may be press-fitted and fixed to the shaft and locked to the step, and the cap may be 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 an open state, so that there is a problem that dust adheres to the eraser, the residue of the eraser spills to the outside, and the eraser is deteriorated because it is exposed. . In addition, there is a problem that the appearance is bad because the eraser is exposed.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned 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 a spiral groove in an inner hole of a cap formed by combining two members. A guide groove is formed on the outside of the cap, and a belt-shaped shutter that is linked to the operating body protruding on the outer periphery of the cap is fitted in the guide groove so that it can move forward and backward, and the eraser projection hole at the rear end of the cap is moved by the forward and backward movement of the shutter. An inner cylinder having a slit at the rear and a shaft portion at the front is inserted inside the spiral groove, and the inner cylinder is rotatable with respect to the cap and is prevented from falling off. An eraser holder with an eraser sandwiching part in the hole and a projection on the side of the front cylinder part can move forward and backward, and the projection is fitted into the slit and the spiral groove, and the shaft part of the inner cylinder is rotated with the front axis and the rotation direction. To make the eraser indentation hole open. Te, wherein the eraser is configured to be retractable from the eraser infested hole of the cap rear end when rotating the cap relative to the front barrel.

[0005]

1 to 3 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 the members of the inner cylinder 14 and the 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 provided as appropriate, and a fitting projection (not shown) is provided on the other mating surface so as to meet with it and form an integral cylindrical body. Further, the cap 4 has an inner hole 6 and a concave groove 7 to be 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 projection 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 ガ イ ド 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. 1
A long slit 15 is formed toward 6. A shaft portion 18 is integrally provided in the front end of the front shaft 1 and integrally engaged with the rear end hole of the front shaft 1 in the rotation direction. The outer periphery of the lead case 3 of the mechanical pencil is appropriately fixed to the inner hole of the shaft portion 18. And, furthermore, the core case 3
Is provided with a partitioning portion 19 that abuts on the rear end. or,
A flange portion 17 that fits into the concave groove 7 of the cap is provided on a rear outer periphery of the shaft portion 18. Also, eraser holder 2
Reference numeral 3 designates a pair of elastic pieces 26 sandwiching one end of an eraser 28 at the rear and a locking protrusion 27 on the inner surface of the elastic piece 26 to bite into the outer surface of the eraser 28. A pair of protrusions 25 are formed coaxially.

The slit 15 is formed in the inner hole of the inner cylinder 14.
The eraser holder 23 is fitted from the rear end to fit the projection 25 and the elastic piece 26 into the slit, and the eraser 28 is fixed to the rear end of the eraser holder 23.
4 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 eraser holder 23
The projection 25 is fitted into the spiral groove 5 with its front end 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 integrally formed with a band-shaped shutter 22 that is elastically displaceable and bendable below the base 21 # of the clip 21 and is formed integrally (in some cases, separately).
Of the shutter is fitted into the cutout 9 of the cap and can be moved back and forth, and the back and forth movement of the operating body 20 causes the rear portion of the shutter 22 to slide in the guide groove 10 and is deformed by the bent portion 10 ° so that the eraser appears and disappears. The hole 12 can be opened and closed.

In this state, the other half cylinders are fitted together and fitted to the integral cap cylinder. By the above, inner cylinder 1
The cap 4 is rotatable with respect to the cap 4 and is prevented from coming off. The shaft 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. The slit 1 of the inner cylinder 14
Although the cylindrical portion having 5 is delicate and easily deformed, the inward deformation is prevented by the engagement between the inclined contact portion 8 and the rear end portion 16, and the cylinder portion is stabilized after the mounting.

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 disposed at the rear end of the mechanical pencil writing instrument was shown, but a ballpoint pen whose writing tip protrudes from the shaft tip by knocking on the rear end can be applied as a writing instrument. It is. 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, as shown in FIG. 1, when the operating body 20 is slid forward, the eraser projection hole 12 is opened. When the cap 4 is rotated left and right with respect to the tip shaft 1 in this state, the eraser 28
Appears through the eraser hole 12. If the rear end of the cap 4 is knocked with the eraser 28 immersed, the core can be extended. When the eraser is consumed and the eraser holder 23 reaches the rear end of the cap 4, a new eraser is replaced. When the operation body 20 is slid backward after the eraser 28 is immersed in the portable device, the shutter 22 slides to close the eraser projection hole 12.

[0011]

[Effects of the Invention] The construction and operation of the feed-out type eraser device of the present invention are as described above. Since the eraser indentation hole is closed when not in use, dust adheres to the eraser, and the residue of the eraser spills out. There is no problem of deterioration, and the problem of deterioration is prevented because the eraser is not exposed.
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.

[Description of Signs] 1 Front shaft 2 Inner hole 3 Core case 4 Cap 5 Spiral groove 6 Inner hole 7 Concave groove 8 Contact part 9 Cut window 10 Guide groove 10 Bend part 11 Step part 12 Eraser rubber indentation holes 13a to 13g Fit Attachment hole 14 Inner cylinder 14 ° Step 15 Slit 16 Rear end 17 Flange 18 Shaft 19 Partition 20 Operating 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)

(57) [Scope of request for utility model registration] 1. A feed-out type eraser device provided at a rear end of a front shaft provided with 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, and a guide groove is formed outside the spiral groove.A belt-shaped shutter interlocking with an operating body protruding on the outer periphery of the cap is fitted in the guide groove so as to be able to move forward and backward, and the shutter is moved forward and backward. An eraser hole at the rear end of the cap is openable and closable, and an inner cylinder with 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 comes off. 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 The shaft is integrally joined to the leading shaft in the rotation direction, A feed-out 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.