JP2607087Y2 - 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 of a so-called feeding type eraser device which is disposed at the rear end of a mechanical pencil and rotates to feed an eraser.

[0002]

2. Description of the Related Art Conventionally, a tip shaft and a cap are separate bodies,
There is known a mechanical pencil in which a cap is rotated with respect to a front shaft to feed out a large-diameter eraser from the rear end, and the 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 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 step The inner cylinder is freely rotatable with respect to the cap to prevent the cap from coming off. Further, the forward end of the inner cylinder is connected so as to interlock with the core case, and is stopped so that only the shaft and the shaft can move.

[0003]

SUMMARY OF THE INVENTION The present invention is a mechanical pencil type eraser device in which a core is extended by the inertia force of a weight by shaking a shaft cylinder, and has a simple structure in which members are omitted. It can be provided at low cost.

[0004]

In order to achieve the above object, a feed-out type eraser device according to the present invention has a spiral groove formed in a rear inner hole of a shaft cylinder and a flange-like operation at a rear end. Part, a guide cylinder part having a slit at the front, and an inner cylinder integrally formed with the shaft part further forward are inserted into the rear inner hole of the shaft cylinder, and the front end of the operating part is brought into contact with the rear end of the shaft cylinder. In the contact state, the locking portion formed on the outer periphery of the rear end of the guide cylinder and the locking portion formed on the inner hole at the rear end of the shaft cylinder engage with each other due to mutual elastic deformation, and the guide cylinder rotates on the shaft cylinder. The guide cylinder has an elastic piece that sandwiches the eraser in the rear, and an eraser holder that has a projection on the side of the front cylinder can move back and forth. The protrusion is further inserted into the spiral groove in the slit, the eraser is fixed to the eraser holder, and the shaft cylinder is operated When the is rotated, the eraser can come and go from the rear end, and the rear end of the lead case is fitted in the shaft part of the inner cylinder so as to be able to move back and forth, and the front end of the shaft part becomes a weight rear end stopper. It is characterized by having been done.

[0005]

FIG. 1 shows an embodiment of the present invention. First,
The feed-out type eraser device is configured by combining members of a shaft cylinder 1, an inner cylinder 8, and an eraser holder 17;
A spiral groove 5 is formed in the rear inner hole 2, and a groove-shaped engaging portion 7 is formed at the rear end of the inner hole so as to engage with an inner cylinder 8 described later only in the rotational direction. A clip 6 is formed on the rear side surface of the barrel 1. Also, a chuck mechanism is provided at the tip of the barrel 1 (not shown), and a weight 4 is loosely fitted to the outer periphery of the core case 3 connected to the chuck mechanism in the barrel so that the shaft 4 can freely move. By swinging back and forth, the chuck mechanism connected to the lead case 3 is moved back and forth by the inertial force of the weight 4 to draw out the lead.

[0006] The inner cylinder 8 has a flange-shaped operating portion 11 which is in contact with the rear end of the shaft cylinder 1 at the rear end thereof and which appropriately bulges in the radial direction, together with a hole through which the eraser 22 is inserted. A guide cylinder 9 having a pair of long slits 10 extending to a step 16.
In addition, the shaft portion 13 is integrally formed further forward. or,
At the outer peripheral portion of the rear end of the guide tube portion 9, a protrusion engaging portion 12 is formed which is engaged with the engaging portion 7 of the shaft tube. Small hole 1 that can be inserted
A partition 14 having 5b is formed.

The eraser holder 17 has a pair of elastic pieces 20 for sandwiching the rear end of the eraser 22 at the rear and a locking projection 21 on the inner surface of the elastic piece 20 for appropriately biting the outer surface of the eraser 22. Are provided with a pair of projections 19 coaxially with the elastic piece 20. A through hole 18a is formed at the center of the cylindrical portion 18.

The eraser holder 17 is fitted into the hole of the guide cylinder 9 of the inner cylinder by elastic deformation of the slit 10 so that the projection 19 and the elastic piece 20 are fitted into the slit 10. Eraser 20 at rear end
Is fixed, the inner cylinder 8 is inserted from the rear end of the shaft cylinder 1, and the locking portion 12 is engaged with the locking portion 7 by elastic deformation, so that the inner cylinder 8 rotates with respect to the shaft cylinder 1. The projection 19 of the eraser holder 17 fits into the spiral groove 5 at this time.

By the way, as described above, the chuck mechanism of the mechanical pencil is provided at the tip of the barrel 1 so as to extend the lead in conjunction with the forward and backward movement of the lead case 3. Since the structure is not the gist of the present invention, the description is omitted. Further, the rear end of the lead case 3 is loosely fitted into the forward hole of the shaft portion 13 of the inner cylinder, the rear end is substantially in contact with the partition part 14, and the weight 4 loosely fitted on the outer periphery of the lead case 3 The rear end is a front end of the shaft portion 13 and serves as a rear end stopper. still,
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 knock mechanism portion in which the writing tip comes out from the shaft tip by knocking and a combination of a weight. Ballpoint pens and the like are also applicable. 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, when the operation unit 11 is rotated right and left with respect to the barrel 1, the eraser 22 is protruded and retracted from the rear end hole. When the shaft cylinder 1 is swung back and forth, the chuck mechanism moves along the axis by the inertial force due to the back and forth movement of the weight 4, and the lead can be extended. When the eraser has been consumed and the eraser holder 17 has reached the rear end of the barrel 1, a new eraser is replaced. When refilling the lead in the lead case 3, the eraser 22 is removed.

[0011]

[Effects of the Invention] The construction and operation of the feed-out type eraser device of the present invention are as described above.
At the rear end of the weight 4 at the front end of the
The assembly procedure is simplified, such as installation and installation is possible.
Therefore, cost can be reduced. In particular, when assembling with an automatic machine, the process is simplified, which is more effective.

[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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Inner hole 3 Core case 4 Weight 5 Spiral groove 6 Clip 7 Locking part 8 Inner cylinder 9 Guide cylinder part 10 Slit 11 Operating part 12 Locking part 13 Shaft part 14 Partition part 15a Core guide part 15b Small hole 16 Step 17 Eraser holder 18 Cylindrical part 18a Through hole 19 Projection 20 Elastic piece 21 Locking projection 22 Eraser

Claims (1)

(57) [Scope of request for utility model registration] A chuck mechanism is provided at the tip of a barrel, a lead case connected to the chuck mechanism is provided in the barrel, a weight is loosely fitted to the lead case, and the lead is shaken back and forth to move the lead. A dispensing type eraser device provided at a rear end of a shaft barrel of a mechanical pencil formed to be extended, wherein the extension type eraser device has a spiral groove formed in a rear inner hole of the shaft cylinder and a rear end. A flange-shaped operation portion, a guide cylinder portion having a pair of slits at the front, and an inner cylinder integrally formed with a shaft portion further forward are inserted into a rear inner hole of the shaft tube, and a front end of the operation portion is formed. Is in contact with the rear end of the barrel, and the locking part formed on the outer periphery of the rear end of the guide cylinder and the locking part formed in the inner hole of the rear end of the barrel engage with each other by elastic deformation. The part is attached to the shaft cylinder so that it can only rotate, and inside the guide cylinder part, a pair of elastic An eraser holder having a pair of protrusions on the side surface of the front cylindrical portion can move back and forth, and the protrusions and the elastic pieces are respectively fitted into the slits, the protrusions are further fitted into the spiral grooves, and the eraser holder is provided with an eraser. When the operating part is rotated with respect to the shaft cylinder, the eraser can be protruded and retracted from the rear end, and the rear end of the lead case is fitted in the shaft part of the inner cylinder so as to be able to move back and forth, A feed-out type eraser device, wherein the front end serves as a rear end stopper of the weight.