JP2557069Y2 - 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. 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. Wear it and rotate the inner cylinder against the cap to keep it from coming off. In addition, the eraser is fixed to the rear end of the eraser holder.At this time, since the eraser holder is almost located at the rear end of the spiral groove, rotate the cap with respect to the inner cylinder and put the eraser inside the cap. I need to be immersed. Therefore, there is a problem that the assembly takes too much time.
Further, there is a problem that the process becomes complicated when assembling with an automatic machine.

[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 a spiral groove in an inner hole of a cap, and has a contact portion at a rear end of the spiral groove. The rear end is opened and provided, a projection is formed at the front end of the spiral groove, and a slit is formed rearward with a concave groove in the inner hole of the cap,
An inner cylinder having a shaft portion at the front is inserted from the front end of the cap, the rear end of the inner cylinder is substantially in contact with the contact portion, and the concave groove of the inner cylinder is fitted into the projection of the cap by elastic deformation. The inner cylinder is rotatably retained with respect to the cap, and an eraser holder with an eraser fixed in the inner hole of the inner cylinder fits the protrusions provided on the side surface at the most immersed position of the inner cylinder into the slit and the spiral groove respectively Then, the shaft of the inner cylinder is integrally joined with the front shaft in the rotation direction,
When the cap is rotated with respect to the front shaft, the eraser can be protruded from the rear end of the cap.

[0005]

FIG. 1 shows an embodiment of the present invention. First,
The feeding type eraser device includes a cap 4, an inner cylinder 11,
It is configured by combining members of the eraser holder 18,
The cap 4 has an inner hole 6 which is fitted on the outer periphery of the rear end of the front shaft 1 in the forward direction.
A spiral groove 5 is formed behind the projection 7,
At the rear end of the spiral groove 5, there is provided an eraser projection hole 10 having an inclined contact portion 8 and opening at the rear end. A clip 9 is provided on the outer peripheral side surface.

The inner cylinder 11 has a rear end portion 13 which is also inclined and substantially abuts the contact portion 8 of the cap 4 together with a hole portion through which the eraser 23 is inserted, and is elongated from substantially the center toward the rear end portion 13. A slit 12 is provided. In addition, the front shaft 1
A shaft portion 14 integrally engaged with the rear end hole in the rotation direction,
An outer peripheral portion of the lead case 3 of the mechanical pencil is appropriately fixed to an inner hole of the shaft portion 14, and further, a partition portion 17 is provided to abut on a rear end of the lead case 3. In addition, a concave groove 15 for elastically fitting the projection 7 of the cap is provided on a rear outer periphery of the shaft portion 14. Further, the eraser holder 18 is a pair of elastic pieces 20 that sandwich the rear end of the eraser 23 rearward.
On the inner surface thereof, there is provided a locking projection 21 which bites into the outer surface of the eraser 23, and the elastic piece 2 is provided on the side surface of the front cylindrical portion 22.
A pair of protrusions 19 are provided on the same axis as 0. (Figure 2
reference)

The slit 12 is formed in the inner hole of the inner cylinder 11.
The eraser holder 18 is fitted into the slit by the elastic deformation to fit the projection 19 and the elastic piece 20 into the slit, and the eraser 20 is fixed to the rear end of the eraser holder 18.
The inner cylinder 11 is inserted from the front end of the cap 4 and the projection 7 of the cap is fitted into the concave groove 15 by elastic deformation. At this time, the projection 19 is fitted into the spiral groove 5 with the front end of the eraser holder 18 in contact with the step 16 of the slit front end of the inner cylinder 11. (Accurately, when the inner cylinder is fastened to the front shaft, the cap is slightly rotated with respect to the front shaft so that the projection and the spiral groove are engaged.) As described above, the inner cylinder 11 connects the rear end 13 to the cap 4. The shaft portion 14 of the inner cylinder 11 is rotatably stopped with respect to the cap 4 in a state where the shaft portion 14 is substantially in contact with the contact portion 8 of the front shaft 1.
And is fixed to the lead case 3. Although the cylindrical portion of the inner cylinder 11 having the slit 12 is delicate and easily deformed, the inward deformation is prevented by the engagement of the inclined contact portion 8 and the rear end portion 13, so that it is stabilized after mounting. I do.

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 arranged 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 is also applied as the writing instrument. Is done. 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.

FIG. 3 shows another embodiment of the eraser holder used in the present invention, which is basically almost the same as the previous embodiment. Explaining only the difference, the eraser holder 30 has a pair of elastic pieces 32 each having a locking projection 33 for fastening the eraser to the inner surface behind the cylindrical portion 34.
Is extended, and a pair of protrusions 31 are provided on the side surface of the cylindrical portion 34 coaxially with the elastic piece 32. The cylindrical portion 34 has a split portion 36 substantially at the center in the axial direction, and has a split shape joined by a hinge portion 35 on the front surface. The reason for dividing into two is that resin molding of the member is facilitated.
It should be noted that the split member may be fixed by providing a locking portion at a main part of each other without being limited to the hinge connection.

[0010]

First, when the cap 4 is rotated to the left and right with respect to the front shaft 1, the eraser 23 comes out of the rear end hole of the cap 4.
If the rear end of the cap 4 is knocked with the eraser 23 immersed, the core can be extended. When the eraser is exhausted and the eraser holder 18 reaches the rear end of the cap 4, a new eraser is replaced.

[0011]

The construction and operation of the feed-out type eraser device of the present invention are as described above. The members can be assembled and attached from one direction, and the assembly procedure is simplified, so that the 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.

FIG. 2 is a perspective view showing an eraser holder used in the present invention.

FIG. 3 is a perspective view showing another embodiment of the eraser holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front shaft 2 Inner hole 3 Core case 4 Cap 5 Spiral groove 6 Inner hole 7 Projection 8 Contact part 9 Clip 10 Eraser projection hole 11 Inner cylinder 12 Slit 13 Rear end part 14 Shaft part 15 Depression groove 16 Step part 17 Partition part 18 Eraser Holder 19 Projection 20 Elastic Piece 21 Locking Projection 22 Tube Section 23 Eraser 30 Eraser Holder 31 Projection 32 Elastic Piece 33 Locking Projection 34 Tube Section 35 Hinge Section 36 Split Section

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 provided with a writing portion on the front side, wherein the dispensing type eraser device has a spiral groove in an inner hole of a cap,
An abutment portion is provided at the rear end of the spiral groove and an eraser protrusion / recess hole opened at the rear end, a projection is formed at the front end of the spiral groove, a concave groove portion is formed in the inner hole of the cap, and a rear slit and a front An inner cylinder having a shaft portion is inserted into the inner cylinder, the rear end of the inner cylinder is substantially in contact with the contact portion, and the concave groove of the inner cylinder is fitted into the projection of the cap by elastic deformation. Is rotatable with respect to the cap, and has an elastic piece that sandwiches the eraser in the inner hole of the inner cylinder, and an eraser holder with a projection on the side of the front cylinder can move back and forth. Then, when the projection and the elastic piece are respectively fitted into the slit, and the projection is further fitted into the spiral groove, and the shaft of the inner cylinder is integrally joined to the front shaft in the rotation direction, and the cap is rotated with respect to the front shaft. A feed-out type eraser characterized in that the eraser can be protruded and retracted from the rear end of the cap. Location.