JP3665089B2 - Feed-out type eraser device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement of a so-called pay-out type eraser device that is arranged at the rear end of a writing instrument and that draws out an eraser by rotating.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a mechanical pencil is known in which a cap is rotated with respect to a front shaft to feed out a large diameter eraser from the rear end, and a rear end is knocked 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 protrusion 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 is provided in the front end inner hole. The inner cylinder is inserted from the rear end of the cap with the protrusion of the eraser holder fitted into the spiral groove while rotating appropriately, and the shaft in front of the inner cylinder is in contact with the rear end of the cap. The elastic protrusion provided on the side of the part is locked to the step part of the cap inner hole, or the ring is press-fitted to the shaft part and locked to the step part, and the cap is sandwiched between the crown part and the step part. Wear and keep the inner cylinder rotatable against the cap. The eraser is fastened to the rear end of the eraser holder. At this time, the eraser holder is almost located at the rear end of the spiral groove. I need to immerse myself. Therefore, there is a problem that the assembly takes too much time. Also, there is a problem that the process becomes complicated when assembling with an automatic machine. In addition, since the rear end of the elastic piece comes into contact with the rear end of the slit (front end of the crown) at the end of the eraser holder, the end of the eraser is inconvenient, and when the eraser is used to the very end, There are problems that are difficult to remove.
[0003]
[Problems to be solved by the invention]
The first object of the present invention is to solve the problem of assembly of the conventional example, and the second object is to insert the eraser when the eraser holder reaches the retracting limit of the cap as the eraser is consumed. The elastic piece to be worn protrudes from the rear end of the cap to inform the use limit of the eraser and to release the retention of the eraser to facilitate the installation of a new eraser.
[0004]
[Means for Solving the Problems]
The pay-out 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 eraser intrusion hole opened at the rear end of the spiral groove is formed at the front end of the spiral groove. Is formed with a concave groove, a slit that is open to the rear end of the inner hole of the cap, and an inner cylinder having a shaft portion in front is inserted, and the rear end part of the inner cylinder is substantially the rear end of the above-mentioned eraser protrusion and recess hole The inner cylinder is rotatable with respect to the cap and is prevented from coming off, and an inner hole portion of the inner cylinder has an elastic piece for sandwiching an eraser in the rear, and a protrusion on the side surface of the front cylinder portion. The eraser holder can be moved back and forth, and the protrusion and elastic piece are inserted into the slit and the protrusion is further inserted into the spiral groove, and the shaft portion of the inner cylinder is joined integrally with the front shaft in the rotational direction. When the cap is rotated, the eraser holder moves backward and the eraser is In the pay-out type eraser device which can be moved in and out, a protrusion having an inclined surface and a step at the front end is formed at the rear end of the slit of the inner cylinder, and a step is provided on the elastic piece of the eraser holder. The eraser holder is formed to be slightly narrower at the rear, and the step of the elastic piece abuts against the step of the protrusion due to the elastic deformation of the protrusion. The narrow width portion is configured to appropriately protrude from the rear end of the cap.
[0005]
【Example】
1 to 5 show an embodiment of the present invention. First, the pay-out type eraser device is configured by combining the members of the cap 4, the inner cylinder 11, and the eraser holder 18. The cap 4 has an inner hole 6 and a concave groove 7 that are fitted on the outer periphery of the rear end of the front shaft 1 at the front. The spiral groove 5 is formed behind the concave groove 7, and an eraser intrusion hole 10 opened at the rear end of the spiral groove 5 is provided. Further, a clip 9 is provided on the outer peripheral side surface of the cap 4 through a clip base 8.
[0006]
The inner cylinder 11 is provided with a long slit 12 from the substantially center toward the rear end portion 13 together with a hole portion through which the eraser 23 is inserted. Further, an inclined surface 25 and a protrusion 24 having a stepped portion 26 at the front end are formed at the rear end of the slit 12. 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 in the front, and the outer peripheral portion of the mechanical pencil case 3 is appropriately fixed to the inner hole of the shaft portion 14. Furthermore, a partition portion 17 that abuts on the rear end of the core case 3 is provided. A flange 15 is provided on the rear outer periphery of the shaft portion 14 so as to be elastically fitted into the concave groove 7 of the cap.
[0007]
The eraser holder 18 is formed with a pair of elastic pieces 20 sandwiching the rear end of the eraser 23 on the rear side. The elastic piece 20 is provided with a step portion 20a so that the rear side is slightly narrow. Further, a locking projection 21 is formed on the inner surface of the narrow portion so as to bite into the outer surface of the eraser 23 as appropriate. A pair of protrusions 19 are provided on the side surface of the front cylindrical portion 22 coaxially with the elastic piece 20. (See Figure 4)
[0008]
An eraser holder 18 is fitted into the inner hole of the inner cylinder 11 from the rear end of the slit 12, the protrusion 24 is elastically expanded, and the protrusion 19 and the elastic piece 20 are inserted into the slit. An eraser 23 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 flange portion 15 is fitted into the concave groove 7 of the cap by elastic deformation. At this time, the protrusion 19 is inserted into the spiral groove 5 with the front end of the eraser holder 18 in contact with the step 16 at the front end of the slit of the inner cylinder 11. (To be precise, when the inner cylinder is fixed to the front shaft, the cap is slightly rotated with respect to the front shaft so that the protrusion and the spiral groove meet.) As described above, the inner cylinder 11 is rotatable with respect to the cap 4. The shaft portion 14 of the inner cylinder 11 is prevented from being rotated by the rear end hole of the front shaft 1 and is fixed to the core case 3.
[0009]
By the way, in front of the front shaft 1, there is provided a mechanical pencil writing element which is arranged so as to feed out the lead in conjunction with the longitudinal movement of the lead case 3. Since the structure is not the gist of the present invention, the description thereof is omitted. In the present embodiment, the pay-out type eraser device disposed at the rear end of the mechanical pencil writing instrument is shown. However, as the writing instrument, a ballpoint pen in which the writing tip portion protrudes and protrudes from the shaft tip by a knock at the rear end is also applied. At that time, instead of the eraser, a solid correction agent or the like that can erase the ballpoint pen ink is attached. In the case of a rubber latex-based erasable ballpoint pen, an eraser is attached.
[0010]
By the way, in the embodiment of the present invention, the flange 15 of the inner cylinder is engaged with the concave groove 7 of the cap by elastic deformation, and the inner cylinder 11 is supported only rotatably with respect to the cap 4. The ring member can be fixed to the inner hole of the inner cylinder or the cap and similarly configured.
[0011]
FIG. 5 shows another form of the eraser holder. The eraser holder 30 is provided with a pair of protrusions 31 coaxially with the elastic piece 32 on the side surface of the cylindrical portion 34. Moreover, the cylinder part 34 has the split part 36 in the approximate center of the axial direction, and becomes the split shape joined by the hinge part 35 of the front. Further, the elastic piece 32 has a step 32a and the front thereof slightly narrow. A locking projection 33 is formed inside the narrow portion. The reason why it was divided into two was that the resin molding of the member was facilitated. In addition, it is also possible not to stick to hinge joining but to fix the split member by providing a latching portion at a mutual essential part.
[0012]
[Action]
First, when the cap 4 is rotated left and right with respect to the front shaft 1, the eraser 23 appears and disappears from the rear end hole of the cap 4. If the rear end of the cap 4 is knocked with the eraser 23 immersed, the lead can be extended. When the eraser is consumed and the eraser holder 18 reaches the retreat limit of the cap 4, the step portion 20a of the elastic piece 20 contacts the step portion 26 of the protrusion 24 at the rear end of the inner cylinder, as shown in FIG. The elastic piece 20 (narrow part) is appropriately projected from the rear end of the cap 4 to notify the end state of the eraser, and the holding of the eraser 23 (the insertion of the eraser by the locking projection 21) can be released. Change the eraser.
[0013]
【The invention's effect】
The structure and operation of the pay-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, since the process is simplified, there is a further effect. Further, the elastic piece protrudes from the rear end of the cap as appropriate when the eraser holder is retracted, so that the use limit of the eraser is known, and the eraser is released from the clamped state, so that the new eraser can be easily replaced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing a pay-out type eraser apparatus according to an embodiment of the present invention, in which an appropriate amount of eraser protrudes.
FIG. 2 is a longitudinal sectional view of a main part showing a state at the time of replacement of an eraser.
FIG. 3 is a view showing a slit of an inner cylinder and a rear end protrusion used in the present embodiment.
FIG. 4 is a perspective view of an eraser holder used in the present embodiment.
FIG. 5 is a perspective view showing another example of an eraser holder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lead shaft 2 Inner hole 3 Core case 4 Cap 5 Spiral groove 6 Inner hole 7 Recessed groove 8 Clip base 9 Clip 10 Hole 11 Inner cylinder 12 Slit 13 Rear end part 14 Shaft part 15 Ridge part 16 Step part 17 Partition part 18 Eraser Holder 19 Protrusion 20 Elastic piece 20a Step portion 21 Locking protrusion 22 Tube portion 23 Eraser 24 Protrusion portion 25 Inclined surface 26 Step portion 30 Eraser holder 31 Protrusion 32 Elastic piece 32a Step portion 33 Locking protrusion 34 Tube portion 35 Hinge portion 36 Split Part

Claims (1)

A spiral groove is provided in the inner hole of the cap disposed at the rear end of the front shaft provided with a writing part on the front side, an eraser intrusion hole opened at the rear end of the spiral groove, and a concave groove at the front end of the spiral groove. A slit that is formed and opened to the rear end of the cap's inner hole and an inner cylinder having a shaft portion in the front are inserted, and the rear end portion of the inner cylinder is positioned up to the substantially rear end of the above-mentioned eraser protrusion / disengagement hole. The inner cylinder is rotatable with respect to the cap and is prevented from coming off, and an inner hole portion of the inner cylinder has an elastic piece for sandwiching an eraser in the rear, and an eraser holder having a protrusion on the side surface of the front cylinder portion. It can be moved back and forth, and the protrusion and elastic piece are inserted into the slit, the protrusion is further inserted into 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 attached to the front shaft When the roller is rotated, the eraser holder moves backward so that the eraser can protrude from the rear end of the cap. In the eraser device of the present invention, the pay-out type eraser device has an inclined surface at the rear end of the slit of the inner cylinder and a protrusion having a stepped portion at the front end, and a stepped portion on the elastic piece of the eraser holder. The eraser holder is formed with a slightly narrower back, and the eraser holder is prevented from coming off by the stepped portion of the elastic piece coming into contact with the stepped portion of the inner cylinder. A feeding-type eraser device characterized in that the portion is appropriately projected from the rear end of the cap.

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