JPH0586588U - 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. [Structure] A spiral groove 5 is provided in an inner hole of a cap 4, a contact portion 8 is provided at a rear end of the spiral groove, and a concave groove 7 is formed at a front end of the spiral groove. The inner cylinder 11 having the slit 12 on the rear side and the shaft portion 14 on the front side is inserted, the rear end portion 13 of the inner cylinder is substantially in contact with the contact portion, and the brim portion is elastic in the concave groove. Due to the deformation, the inner cylinder is rotatably retained with respect to the cap, and an eraser holder 18 having an eraser 20 fixed to the inner hole portion of the inner cylinder is movable back and forth, and a protrusion 19 provided on the side surface thereof serves as a slit. The shaft portions of the inner cylinder are integrally joined with the front shaft 1 in the rotational direction by being fitted in the spiral grooves, respectively, and when the cap is rotated with respect to the front shaft, the eraser can appear and disappear from the rear end of the cap.

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 the rear end, and a rear end is knocked against the 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.The shaft in front of the inner cylinder with the front end of the crown in contact with the rear end of the cap The protrusion of the elastic piece provided on the side surface of the part is locked to the step part of the cap inner hole, 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, an abutting portion is provided at the rear end of the spiral groove, and the rear end is opened. A concave groove is formed at the front end of the spiral groove, and an inner cylinder having a flange at the inner hole of the cap and a slit at the rear and a shaft at the front is inserted from the front end of the cap to form the inner cylinder. With the rear end of the abutting part substantially in contact with the abutting part, the brim part is elastically deformed into the concave groove to rotatably retain the inner cylinder with respect to the cap. An eraser holder with an eraser 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. The eraser can retract from the rear end of the cap when the cap is rotated with respect to the front shaft.

[0005]

【Example】

 FIG. 1 shows an embodiment of the present invention. First, the feed-out type eraser device is constructed by combining the members of the cap 4, the inner cylinder 11, and the eraser holder 18, and the cap 4 is forwardly recessed into the inner hole 6 fitted to the outer periphery of the rear end of the front shaft 1. The spiral groove 5 has a groove 7, a spiral groove 5 is formed behind the concave groove 7, and a stepped contact portion 8 is provided at the rear end of the spiral groove 5 and an open eraser retractable hole 10 is provided at the rear end. ing. Further, a clip 9 is provided on the outer peripheral side surface.

The inner cylinder 11 has a rear end portion 13 that substantially abuts the abutting portion 8 of the cap 4 together with a hole portion through which the eraser 20 is inserted, and a long slit 12 is formed from approximately the center to the rear end portion 13. It is set up. 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 lead case 3 of the mechanical pencil is appropriately stopped in the inner hole of the shaft portion 14. A partition portion 17 that is attached to the core case 3 and is in contact with the rear end of the core case 3 is provided. Further, a brim portion 15 which is elastically fitted into the concave groove 7 of the cap is provided on the rear outer periphery of the shaft portion 14. Further, the eraser holder 18 has a bottomed hole portion for fixing the rear end of the eraser 20 to the rear end, and a projection 19 is provided on the outer peripheral portion of the front end.

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 into the slit, and the eraser 20 is stopped at the rear end of the eraser holder 18. Then, the inner cylinder 11 is inserted from the front end of the cap 4, and the brim portion 15 is elastically deformed to fit into the concave groove 7 of the cap. At this time, the projection 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 exact, when the inner cylinder is fixed 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 with the cap 4 attached. Of the inner cylinder 11, 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. Be fastened.

By the way, a writing element of a mechanical pencil is provided in front of the tip shaft 1 so as to extend the lead in conjunction with the forward and backward movement of the lead case 3. The description of the structure is omitted because it is not the gist of the present invention. Further, in the embodiment of the present invention, the feed-out type eraser device provided at the rear end of the sharp pencil writing tool is shown. It 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.

FIG. 2 shows another embodiment of the present invention, which is basically the same as the previous example. Explaining only the difference, a hole 24 is formed at the rear end of the inner hole of the cap 21 by the boss 23, and the rear end 28 of the inner cylinder 26 is substantially in contact with the contact portion 25 at the rear end of the hole 24. . Further, the slit 27 of the inner cylinder 26 is provided up to the rear end portion 28. Therefore, the eraser holder having the eraser 31 fixed thereto can be inserted into the inner hole portion of the inner cylinder without elastically deforming the slit as in the previous example, so that the assembling becomes easy. Further, it is convenient in terms of process for assembly by an automatic machine.

[0010]

[Action]

 First, when the cap 4 is rotated to the left or right with respect to the front shaft 1, the eraser 20 projects from the rear end hole of the cap. The core can be extended by knocking the rear end of the cap 4 with the eraser 20 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 the device]

 The construction and operation of the feeding type eraser device of the present invention are as described above, 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 an essential part showing 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 vertical cross-sectional view of a main part of a feeding type eraser device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip shaft 2 Inner hole 3 Core case 4 Cap 5 Spiral groove 6 Inner hole 7 Recessed groove 8 Abutment part 9 Clip 10 Eraser retractable hole 11 Inner cylinder 12 Slit 13 Rear end part 14 Shaft part 15 Flange part 16 Step part 17 Partition Part 18 Eraser Holder 19 Protrusion 20 Eraser 21 Cap 22 Eraser Emerging Hole 23 Boss 24 Hole 25 Abutment 26 Inner Cylinder 27 Slit 28 Rear End 29 Flange 30 Eraser Holder 31 Eraser

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,
An eraser retractable hole with a contact portion provided at the rear end of the spiral groove and an opening at the rear end, a concave groove is formed at the front end of the spiral groove, and a slit is provided rearward with a brim portion in the inner hole of the cap, The inner cylinder having the shaft portion is inserted in the front, the rear end portion of the inner cylinder is substantially in contact with the contact portion, and the collar portion of the inner cylinder is elastically deformed into the concave groove to form the inner cylinder. An eraser holder with an eraser fixed in the inner hole of the inner cylinder can be moved back and forth, and the protrusions on its side are inserted into the slit and the spiral groove, respectively. A feed-out type characterized in that the shaft portion of the cylinder is integrally joined to the front shaft in the rotation direction, and the eraser can be retracted from the rear end of the cap when the cap is rotated with respect to the front shaft. Eraser device.