JPH0642271U - Feed-out type eraser device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the assembling property of the feeding type eraser device arranged at the rear end of the writing instrument and to reduce the cost. The cap 4 has a spiral groove 5 in its inner hole, a rear end of the spiral groove is provided with an abutting portion 8, a projection 7 is formed at the front end of the spiral groove, and a concave groove 15 is formed at the front end of the cap. The slit 12 on the rear side and the inner cylinder 11 having the shaft portion 14 on the front side are inserted so that the rear end portion 13 of the inner cylinder is substantially in contact with the contact portion, and the projection of the cap is inserted into the groove of the inner cylinder. The inner cylinder is rotatably retained by the cap by elastically deforming, and the inner cylinder has an elastic piece 20 that holds the rear end of the eraser 23 in the rear, and is provided on the side surface of the front cylinder portion 22. The eraser holder 18 provided with the protrusion 19 can be moved back and forth, and the protrusion and the elastic piece are respectively fitted in the slits, and the protrusion is fitted in the spiral groove to integrally join the shaft portion of the inner cylinder with the front shaft 1 in the rotation direction. The eraser can be retracted from the rear end of the cap when the cap is rotated with respect to the front shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a so-called feed-out type eraser device which is arranged at the rear end of a writing instrument and which feeds out an eraser by rotating.

[0002]

[Prior art]

 Conventionally, there is known a mechanical pencil in which a cap is rotated with respect to a front shaft to extend a large-diameter eraser from a rear end, and a rear end is knocked against a front shaft to extend a lead. In the conventional case, a large-diameter crown is formed at the rear end of the inner cylinder having a slit, and an eraser holder having a protrusion on the side surface is fitted into the inner cylinder through the slit. The cap has a spiral groove in the inner hole from the rear end, and a step is provided in the front end inner hole. From the rear end of the cap, while rotating the inner cylinder appropriately, insert the protrusion of the eraser holder into the spiral groove and insert it, and with the front end of the crown in contact with the rear end of the cap, insert the shaft in front of the inner cylinder. The protrusion of the elastic piece provided on the side surface of the part is locked to the step part of the inner hole of the cap, or the ring is press-fitted and fixed to the shaft part and locked to the step part, and the cap is sandwiched between the crown and the step part. Wear it to prevent the inner cylinder from freely rotating with respect to the cap. Also, the eraser is fixed to the rear end of the eraser holder.At this time, since the eraser holder is located almost at the rear end of the spiral groove, the cap is rotated with respect to the inner cylinder to cover the eraser. It is necessary to immerse it in the group. Therefore, there is a problem that assembly takes too much time. Further, there is a problem that the process becomes complicated when assembling with an automatic machine.

[0003]

[Problems to be solved by the device]

 The present invention aims to solve the problems of the conventional example.

[0004]

[Means for Solving the Problems]

 The feeding type eraser device of the present invention devised to achieve the above object has a spiral groove in the inner hole of the cap, and an abutting portion is provided at the rear end of the spiral groove to open the rear end. A protrusion is formed at the front end of the spiral groove, and a slit is provided in the inner hole of the cap, a slit is provided at the rear, and an inner cylinder having a shaft portion at the front is inserted from the front end of the cap, and the rear of the inner cylinder is inserted. With the end part almost in contact with the abutting part, the concave groove of the inner cylinder is elastically deformed into the projection of the cap, and the inner cylinder is rotatably retained with respect to the cap. The eraser holder to which the eraser is fixed is inserted into the slit and the spiral groove by the protrusions provided on the side surface at the most retracted position of the inner cylinder, and the shaft of the inner cylinder is integrally joined with the front shaft in the rotation direction. On the other hand, when the cap is rotated, the eraser can be retracted from the rear end of the cap.

[0005]

【Example】

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

The inner cylinder 11 also has an inclined rear end portion 13 that substantially abuts on the abutting portion 8 of the cap 4 together with a hole portion through which the eraser 23 is inserted, and is elongated from approximately the center toward the rear end portion 13. The slit 12 is bored. In addition, a shaft portion 14 that integrally engages with the rear end hole of the front shaft 1 in the rotational direction is provided on the front side, and the outer peripheral portion of the lead case 3 of the mechanical pencil is appropriately fixed to the inner hole of the shaft portion 14. In addition, a partition portion 17 is provided which contacts the rear end of the lead case 3. Further, a concave groove 15 is provided on the rear outer periphery of the shaft portion 14 to elastically fit the projection 7 of the cap. Further, the eraser holder 18 has a pair of elastic pieces 20 sandwiching the rear end of the eraser 23 on the rear side and a locking projection 21 on the inner surface thereof, which appropriately bites into the outer surface of the eraser 23, and the front cylindrical portion 22. A pair of protrusions 19 are provided on the side surface coaxially with the elastic piece 20. (See Figure 2)

The eraser holder 18 is fitted into the inner hole of the inner cylinder 11 by elastic deformation of the slit 12 to fit the protrusion 19 and the elastic piece 20 into the slit, and at the rear end of the eraser rubber holder 18. The eraser 20 is fixed, 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 groove 15 by elastic deformation. At this time, the protrusion 19 is fitted into the spiral groove 5 in a state where the front end of the eraser holder 18 is in contact with the step portion 16 at the front end of the slit of the inner cylinder 11. (To be precise, 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 come into contact with each other.) As described above, the inner cylinder 11 has the rear end portion 13 in the cap 4 Of the inner cylinder 11 is rotatably prevented from coming off, and the shaft portion 14 of the inner cylinder 11 is prevented from rotating in the rear end hole of the front shaft 1 and the core case 3 Fastened to. The tubular portion of the inner tube 11 having the slit 12 is delicate and easily deformed, but the slanted contact portion 8 and the rear end portion 13 are entangled with each other to prevent the inward deformation and stabilize the apparatus after mounting. To do.

By the way, a writing element of a mechanical pencil is provided in front of the leading shaft 1 so as to extend the lead in conjunction with the forward and backward movement of the lead case 3. The structure thereof is not the gist of the present invention, so the description thereof will be omitted. Further, in the embodiment of the present invention, the feed-out type eraser device provided at the rear end of the sharp pencil writing instrument is shown. However, as the writing instrument, a ballpoint pen in which the tip of the writing comes out from the tip of the shaft due to the knock at the rear end is also applicable. To be done. At that time, instead of the eraser, a solid correction agent that can erase the ballpoint pen ink is attached. If a rubber latex type erasable ballpoint pen is used, an eraser is attached.

By the way, FIG. 3 shows another embodiment of the eraser holder used in the present invention, which is basically the same as that of the previous example. Explaining only the differences, the eraser holder 30 is provided with a pair of elastic pieces 32 having locking projections 33 for fixing the eraser on the inner surface of the cylindrical portion 34. The elastic piece 32 is provided on the side surface of the cylindrical portion 34. A pair of protrusions 31 is provided coaxially with 32. Further, the tubular portion 34 has a split portion 36 at substantially the center in the axial direction, and has a split shape joined by a hinge portion 35 on the front surface. The reason for splitting the product in two is that it facilitates resin molding of the member. Incidentally, it is also possible to fix the two split members by providing a locking portion at an essential portion of each other, without sticking to the hinge joining.

[0010]

[Action]

 First, when the cap 4 is rotated to the left or right with respect to the front shaft 1, the eraser 23 projects from the rear end hole of the cap 4. The core can be extended by knocking the rear end of the cap 4 with the eraser 23 retracted. When the eraser is exhausted and the eraser holder 18 reaches the rear end of the cap 4, a new eraser is replaced.

[0011]

[Effect of device]

 The construction and operation of the feeding-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 drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a feeding type eraser device according to an embodiment of the present invention, in which an appropriate amount of eraser is projected.

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]

 1 Tip Shaft 2 Inner Hole 3 Core Case 4 Cap 5 Spiral Groove 6 Inner Hole 7 Protrusion 8 Abutment 9 Clip 10 Eraser Emergence Hole 11 Inner Cylinder 12 Slit 13 Rear End 14 Shaft 15 Recess 16 Groove 17 Partition 18 Eraser holder 19 Protrusion 20 Elastic piece 21 Locking protrusion 22 Cylinder part 23 Eraser 30 Eraser holder 31 Protrusion 32 Elastic piece 33 Locking protrusion 34 Cylindrical part 35 Hinge part 36 Split part

Claims (1)

[Scope of utility model registration request] 1. A feed-out type eraser device disposed at the rear end of a front shaft having a writing portion on the front side, wherein the feed-out type eraser device includes a spiral groove in an inner hole of a cap,
The rear end of the spiral groove has an abutment hole that opens and closes at the rear end of the spiral groove, and the front end of the spiral groove has a projection. The inner cylinder having the 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 elastically fitted into the protrusion of the cap to Is rotatably attached to the cap and has an elastic piece that holds the eraser in the inner hole of the inner cylinder, and an eraser holder with a protrusion on the side of the front cylinder can move back and forth. Then, the projection and the elastic piece are respectively fitted in the slits, and the projection is further fitted in the spiral groove, and the shaft portion of the inner cylinder is integrally joined with the front shaft in the rotation direction, and the cap is rotated with respect to the front shaft. The eraser is a retractable eraser that is configured so that the eraser can be retracted from the rear end of the cap. Location.