JP2607092Y2 - 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 pay-out type eraser device which is disposed at the rear end of a writing instrument and rotates so as to feed out 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 out 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, and the cap may be sandwiched between the crown and 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 The first object of the present invention is to solve the problems of the prior art, and the second object is that the eraser holder reaches the limit of retraction of the cap with the consumption of the eraser. Sometimes, an elastic piece for sandwiching the eraser protrudes from the rear end of the cap to inform the user of the limit of use of the eraser and to release the holding of the eraser to facilitate mounting of a new eraser.

[0004]

A feed-out type eraser device according to the present invention devised to achieve the above object is provided with a spiral groove having a stopper at a rear end in an inner hole of a cap,
Hole eraser infested opened in the rear end of the spiral groove, the front end of the spiral groove recessed groove is formed, open to the rear end to the inner hole of the cap
The slit that has been opened and the inner cylinder having a shaft in the front are inserted, the rear end of the inner cylinder is positioned almost to the rear end of the hole for the eraser, and the inner cylinder is rotatable with respect to the cap. The inner cylinder has an elastic piece that sandwiches the eraser at the rear, and an eraser holder that has a projection on the side of the front cylinder can move back and forth. In the above slit, the projection is further fitted into the spiral groove, and the core case is integrally formed only in the rotation direction with respect to the front shaft, so that it can be inserted and removed with a suitable force between the shaft portion of the inner cylinder and the core case. Part and a rotating direction engaging part released by a predetermined torque or more,
When the inner cylinder is joined to the core case and the cap is rotated with respect to the front shaft, the eraser holder retracts and the eraser can come out from the rear end of the cap, and at the limit of the eraser holder retreat, the eraser holder The protrusion is prevented from moving by the stopper of the spiral groove, and the elastic piece is configured to appropriately project from the rear end of the cap.

[0005]

1 to 7 show an embodiment of the present invention. First, the feed-out type eraser device has a cap 4,
The cap 4 is formed by combining members of an inner cylinder 11 and an eraser holder 18, and the cap 4 has an inner hole 6 and a concave groove 7 fitted on the outer periphery of the rear end of the front shaft 1, and a spiral groove behind the concave groove 7. 5 is formed, and a stopper 5a is formed as a wall of a substantially right-angled surface at the rear end of the spiral groove 5. Further, a crown 8 is fixed to the rear end of the cap 4, and a hole 10 is formed at the rear end of the cap 4 so that an eraser can appear. A clip 9 is provided on the outer peripheral side surface of the cap 4.

The inner cylinder 11 has a slit 12 extending from substantially the center toward the rear end 13 together with a hole through which the eraser 23 is inserted.
Are drilled. A shaft portion 14 is integrally provided in front of the rear end hole of the front shaft 1 in the rotation direction, and 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. Further, a partitioning portion 17 is provided which substantially abuts the rear end of the lead case 3. A flange 15 is provided on the rear outer periphery of the shaft 14 so as to elastically fit into the concave groove 7 of the cap. The inner hole of the shaft portion 14 has a ring-shaped or intermittent projection 14c from the front side, and a groove-shaped locking portion 14a is formed behind the protrusion 14c.
Has a polygonal cross section.

The eraser holder 18 has a pair of elastic pieces 20 sandwiching the rear end of the eraser 23 at the rear and a locking projection 21 on the inner surface of the elastic piece 20 which bites into the outer surface of the eraser 23. Is provided with a pair of protrusions 19 coaxially with the elastic piece 20. (See Fig. 6)

A mechanical unit for gripping and extending the lead of the mechanical pencil is connected to the front of the lead case 3, and the lead case 3 is integrally formed directly or indirectly with the front shaft 1 only in the rotational direction. I have. Further, a flange 3b is formed at the rear of the core case 3 and a protruding locking portion 3a which engages with the locking portion 14a is formed behind the flange 3b.
Outer periphery 3d, which also has a polygonal shape, which engages with the rotating direction
Are formed. In the area of the outer periphery 3d, a split groove 3c is provided at a required position along the axial direction, and the outer periphery 3d is configured to be deformable to the inner diameter side.

As described above, the eraser holder 18 is fitted into the inner hole of the inner cylinder 11 from the rear end of the slit 12 so that the projection 19 and the elastic piece 20 are fitted into the slit. The inner cylinder 11 is inserted from the front end of the cap 4 so that the flange 1
5 is fitted into the concave groove 7 of the cap 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 at 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 meet.) Thus, the inner cylinder 11 is freely rotatable with respect to the cap 4. The shaft portion 14 of the inner cylinder 11 is fitted to the rear end of the core case 3 so that the front end of the shaft portion 14 contacts the flange 3b, and the inner cylinder 11 comes off the core case 3 with an appropriate force. It is stopped and integrally fixed in the rotation direction within a required torque.

As described above, the writing mechanism of the mechanical pencil is provided in front of the front shaft 1 so as to extend the lead in conjunction with the forward and backward movements 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, 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 ballpoint pen whose writing tip comes out of the shaft tip by knocking on the rear end is also applied. You. 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.

In the embodiment of the present invention, the inner cylinder 11 is engaged with the concave groove 7 of the cap by elastic deformation so that the inner cylinder 11 is rotatably supported with respect to the cap 4. However, it is also possible to make the same configuration by fixing the ring member to the inner hole of the inner cylinder or the cap. FIG. 7 shows another embodiment of the eraser holder. The eraser holder 30 has a pair of protrusions 31 provided coaxially with the elastic piece 32 on the side surface of the cylindrical portion 34. The cylindrical 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 dividing into two is that the 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.

[0012]

First, when the cap 4 is rotated to the left and right with respect to the front shaft 1, the eraser 23 protrudes and retracts from the rear end hole of the crown 8. If the rear end of the cap 4 is knocked with the eraser 23 immersed, the core can be extended. The eraser is worn out,
When the eraser holder 18 reaches the retreat limit of the cap 4, the elastic piece 20 appropriately protrudes from the rear end hole of the crown 8 as shown in FIG. 2, so that the holding of the eraser 23 can be released, and a new eraser can be released. Can be replaced.
When the eraser holder 18 is retracted, the projection 19 abuts on the stopper 5a of the spiral groove and is prevented from moving. When the rotation torque is more than necessary on the cap 4 at that time, the abutment state is not satisfied. Perimeter of core case 3 so that it is not destroyed
d is deformed to the inner diameter side and the shaft portion 14 of the inner cylinder is
Acts to slip.

[0013]

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. or,
Since the elastic piece protrudes from the rear end of the cap appropriately at the retreat limit of the eraser holder, the use limit of the eraser is understood, and
Since the clamped state of the eraser is released, replacement of a new eraser is facilitated.

[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 longitudinal sectional view of a main part showing a state when an eraser is replaced.

FIG. 3 is a side view as viewed from the rear end of FIG. 1;

FIG. 4 is a sectional view taken along the line AA in FIG. 1;

FIG. 5 is a sectional view showing a main part of a rear end of the cap.

FIG. 6 is a perspective view showing an eraser holder used in the present invention.

FIG. 7 is a perspective view showing another example of the eraser holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front shaft 2 Inner hole 3 Core case 3a Engagement part 3b Flange part 3c Split groove 3d Outer circumference 4 Cap 5 Helical groove 5a Stopper 6 Inner hole 7 Concave groove 8 Crown 9 Clip 10 Hole 11 Inner cylinder 12 Slit 13 Rear end 14 Shaft 14a Locking part 14b Inner circumference 14c Projection 15 Flange 16 Step 17 Partitioning part 18 Eraser rubber holder 19 Projection 20 Elastic piece 21 Engagement projection 22 Tube part 23 Eraser 30 Eraser rubber holder 31 Projection 32 Elastic piece 33 Engagement projection 34 Tube part 35 Hinge part 36 Split part

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 having a writing portion on the front side, wherein the dispensing type eraser device has a stopper at a rear end in an inner hole of a cap. It has a spiral groove, a hole for the rubber eraser opening at the rear end of the spiral groove, a concave groove at the front end of the spiral groove, a slit opening to the rear end of the inner hole of the cap, and a shaft part in the front. The inner cylinder is inserted, the rear end of the inner cylinder is positioned almost to the rear end of the hole of the eraser, and the inner cylinder is rotatably stopped with respect to the cap. An eraser holder having an eraser at the rear and having a protrusion on the side surface of the front cylindrical portion can be moved back and forth, and the protrusion and the elastic piece are respectively fitted into the slit, and the protrusion is further fitted into the spiral groove. At the same time, the core case is integrally formed only in the rotation direction with respect to the The inner cylinder is joined to the core case by providing an engagement portion that can be inserted and removed with appropriate force between the portion and the core case, and an engagement portion in the rotation direction that is released with a predetermined torque or more. When the cap is rotated, the eraser holder retreats so that the eraser can protrude from the rear end of the cap, and at the retreat limit of the eraser holder, the protrusion of the eraser holder is prevented from moving by the stopper of the spiral groove and the elastic piece Are arranged so as to appropriately project from the rear end of the cap.