JPH07304298A - Movable eraser - Google Patents

Abstract

PURPOSE:To prevent the deformation of an eraser protruding in the state that the eraser is fed to protrude in a degree for easily erasing a clerical error despite the greatness of a pressing force to a sheet surface. CONSTITUTION:A rodlike lead 4 is coaxially inserted into a barrel 1, a rodlike eraser 2 is supported to the lead 4 in a penetrating state to telescopically mount the eraser 2 from an end feeding port 3 in the barrel 1. The lead 4 is formed in a length substantially in the entire length of the barrel of a hard member to allow its one end side to protrude at a desired protruding distance L from the port 3 of the barrel 1. Further, an axial hole 2-1 in which the lead 4 is inserted in the penetrating state from the front end toward the rear end at the lead of the eraser 2. Thus, the eraser 2 fed to protrude from the port 3 of the barrel 1 is held from the interior by the lead 4 similarly protruding to eliminate the deformation of the eraser 2 due to the pressing force to a sheet surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable eraser, and more particularly, to a pen-type movable eraser in which a rod-shaped eraser is inserted (retracted) into and out of a shaft barrel through a tip feeding port. Is.

[0002]

2. Description of the Related Art Conventionally, as a pen-type movable eraser of this type, for example, a knock movable eraser illustrated in FIG. 8 is known. This knockable eraser is rod-shaped inside the outer pipe 30-1 of the shaft cylinder 30 and is inserted inside the outer pipe 30-1 of the shaft cylinder 30 while being elastically urged in the backward direction by the spring 31 so as to move forward and backward. By inserting the eraser 32 and repeatedly pushing the knock operation part 33 at the rear end of the inner pipe 30-2 protruding from the rear end of the outer pipe 30-1 by the thumb operation like an ordinary knock-type writing instrument, the outer The eraser 32 is gripped by the chuck 36 at the tip of the inner pipe 30-2 that holds the eraser 32 by the engagement and disengagement with the tightening sleeve 35 that is fitted in the tip feed-out port 34 of the pipe 30-1 so as to be propulsive. It is adapted to be fed out stepwise from the tip feeding port 34.

[0003]

However, although it depends on how the user handles the eraser, the eraser 32 can be pressed to the surface of the paper so that the erroneous writing can be easily erased.
When erasing out the erroneous portion by pushing it out from the feeding port 34 and pressing it against the paper surface A, the eraser 32 is deformed from the material due to the fluttering as shown in the figure. I had to use it while adjusting the pressing force of the eraser 32.
In other words, there is a handling problem that the erroneous writing must be used while adjusting the frictional force with the paper surface A necessary for erasing the typographical error smoothly, and therefore the erroneous writing cannot be erased smoothly. Also, if it is used without adjustment, it may be completely broken and wasted. As a method of solving the above-mentioned problem, it is conceivable that the rod-shaped eraser should be made thicker so that it will not be deformed, but the barrel itself must be made thicker as the eraser becomes thicker. Since this has to be done, the production cost will rise sharply.

The present invention has been made in view of such conventional circumstances. As a first object thereof, regardless of the magnitude of the pressing force against the surface of the sheet, the protruding state is such that the erroneous writing can be easily ejected and projected. In order to prevent deformation of the eraser, it can be used as a guide for the amount of protrusion of the eraser for the second purpose, and even if the eraser is worn out while repeating the erase operation for the third purpose. It is to provide an improved movable eraser so as not to interfere with the erase operation.

[0005]

To achieve the above object, the technical means taken by the present invention is a movable means in which a rod-shaped eraser is inserted into a shaft cylinder so that it can be retracted and inserted into and out of a tip end feeding port of a coaxial cylinder. In a type eraser, a rod-shaped core body is coaxially inserted into the shaft cylinder, and the rod-shaped eraser is supported through the core body in a penetrating manner so that the eraser can be inserted into and retracted from the tip feeding port into the shaft cylinder. The rod-shaped core body is made of a hard material and is formed over a substantially entire length of the barrel, and one end of the rod-shaped core is projected from the tip end feeding port of the barrel by a desired protrusion amount and the other end side is formed. While the rod-shaped eraser is supported at the rear end of the shaft cylinder, the shaft core is provided with a shaft hole for inserting the core body that penetrates from the front end toward the rear end. Further, the rod-shaped core body is inserted into the shaft cylinder so as to be able to advance and retreat, and the other end side of the core body is projected from the rear end of the shaft cylinder so that the rod-shaped core body can be brought into contact with and separated from the rear end. On the other hand, a tail plug is attached to the rear end of the barrel to elastically urge the core body in the tail plug in the forward direction.A spring is set to be smaller than the pressing force of the eraser against the paper surface. The point is to wear it.

[0006]

According to the above-mentioned technical means according to claim 1 of the present invention, when the rod-shaped eraser is projected from the tip end feeding port of the barrel, the protruding portion of the eraser is present from the feeding port. Since it is held from the inside by the rod-shaped core body, it is not deformed so as to be folded even if it is pressed more than necessary when it is pressed against the paper surface to erase erroneous writing. Then, by setting the protrusion amount of the rod-shaped core body from the tip feeding port to the feeding protrusion amount of the best eraser that can erase erroneous smoothly, the user can set the protruding state of the rod-shaped core body. As a guide, the eraser can be extended and protruded from the barrel, and the user can always use the eraser in the best (constant) protruding state in which mistakes can be easily erased. Further, according to the technical means described in claim 2, even if the eraser is worn out in the process of erasing the erroneous writing by pressing the eraser projected from the tip feeding port of the shaft cylinder against the paper surface, the reduced state Accordingly, the protruding state of the rod-shaped core from the tip feeding port is also displaced backwards against the elastic force of the spring, which may interfere with the erasing operation of the rod-shaped core or damage the paper surface. There is no.

[0007]

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 5, a rod-shaped eraser 2 inserted into and retracted from a shaft cylinder 1 by a sliding operation is shown.
Shown is a slide movable eraser (hereinafter simply referred to as a slide eraser) configured to project and project from the tip feeding port 3 step by step, and one end (tip) is projected from the tip feeding port 3 at a desired protrusion amount. The rod-shaped eraser 2 for preventing the bending deformation of the protruding portion of the rod-shaped eraser 2 which is fed out from the feeding port 3 and protruded is coaxially inserted in the barrel 1 and the rod-shaped eraser 2 is attached to the core 4. The eraser 2 which is supported in a penetrating manner is inserted into the barrel 1 so that it can be retracted and retracted through the tip feeding port 3.

The shaft cylinder 1 is made of a hard resin such as a thermoplastic resin and is formed into a round hollow shape having an appropriate thickness, and is also round and is used for inserting a core body that penetrates the shaft core from the front end portion toward the rear end portion. The rod-shaped eraser 2 provided with the shaft hole 2-1 can be loosely inserted, and the feeding port 3 for the eraser 2 is provided at the tip of the rod-shaped eraser 2. A rear end opening for fixing and supporting the end side is provided, and the tail plug 5 is provided in the rear end opening.
The other end side of the rod-shaped core body 4 can be fixedly supported by mounting it on the crown. A guide wall 6 is provided on the cylinder wall of the shaft cylinder 1 so as to continuously open in a serrated shape in the cylinder direction, and the rear end of the rod-shaped eraser 2 is fitted and connected to the guide groove 6. So that the eraser 2 is elastically engaged with the slide operation portion 7 for performing the operation of gradually extending and projecting the eraser 2 from the front end feeding port 3 so that the operation portion 7 can be mounted in the barrel 1 so as to be movable back and forth in the barrel direction. I am doing it.

Incidentally, the slide operation portion 7 of the slide type eraser of this embodiment elastically engages with the concavo-convex connecting portion 6-1 of the guide groove 6 of the shaft cylinder 1 by using an appropriate synthetic resin material. It is an integrally molded product in which the elastic unit 8 is integrally provided. More specifically, a flat plate shape U in which a rear wall of the rod-shaped eraser 2 is connected and supported so as to be slidably slidably contacted in the shaft cylinder 1 in a cylinder direction with one cylinder wall directed in the cylinder direction. A protruding piece 8-1 that is elastically formed in the axial direction by projecting in one direction from one side of the opening by opening in a V shape, and is integrated on this protruding piece 8-1 at an appropriate height. A clip 7-2 is integrally formed on the upper end of the guide groove 6 which is projected from the guide groove 6 to the outside of the cylinder, and is integrally provided on both sides of the base of an upright portion 7-3. -1
Engagement part 8-2 that is elastically engaged and disengaged by the elastic action of
An elastic unit 8 composed of and is integrally provided. A slit 9 for mounting the integrally formed slide operating portion 7 on the barrel 1 is provided from the rear end opening of the barrel 1 to the guide groove 6, so that the slide operating portion 7 can be easily attached to the barrel 1 from the slit 9. It is designed to be assembled and attached to (see FIG. 3).

Therefore, in the present invention, in addition to the object described in the section of the problem to be solved by the invention, as a fourth object, a slide operation part for the concave-convex connecting part 6-1 of the guide groove 6 of the shaft cylinder 1. Resilient engagement of 7 is possible without using a separately formed leaf spring or the like like a conventional slide eraser. That is, it is possible to improve productivity by reducing the number of parts and simplifying the assembling work of the slide operating portion 7 with respect to the shaft cylinder 1, and to provide the slide type eraser at a low cost.

The rod-shaped core body 4 has a tip feeding port 3 inside the barrel 1.
Stick-shaped eraser that can be inserted and removed from
Is supported in the same cylinder 1 in a penetrating manner, and the tip feeding port 3
The protruding portion of the eraser 2 that is drawn out from the paper is the paper surface A.
It acts to hold the protruding portion from the inside so as not to be distorted and deformed due to the pressing force against the shaft cylinder 1 by a hard member such as metal or hard resin material.
Shaft core hole of eraser 2 with a rod length that is almost the entire length
2-1 is formed so that it can be loosely inserted and its one end (tip) is formed in a spherical shape, and the other end (rear end) is brought into contact with the rear end opening edge of the barrel 1. A collar 4-1 for press-contacting and fixing with the tail plug 5 is provided, and after inserting from the rear end opening of the shaft cylinder 1 toward the tip feeding port 3, the rear end collar 4-1 is brought into contact with the edge of the rear end opening. Then, the tail plug 5 is screwed or fitted into the opening so that the cap is screwed into the screw portion 10 provided outside the rear end opening of the shaft cylinder 1 in the figure, and the rear end collar 4-1 is attached. It is fixed to the rear end opening of the barrel 1 and mounted in the barrel 1 coaxially in the barrel 1 with the spherical tip 4-2 side protruding from the feeding port 3 by a desired protrusion amount L. I'm supposed to get it.

It should be noted that the above-mentioned desired amount of protrusion L means that when the eraser 2 that has been extended and extended from the tip end feeding port 3 of the barrel 1 is pressed against the sheet surface A to eliminate erroneous writing, the edge of the feeding port 3 is the sheet. It refers to a protruding state where typographical errors can be erased smoothly without touching (caught). That is, this type of pen-type sliding eraser has a shaft cylinder 1 with an appropriate angle with respect to the paper surface A in the same manner as an ordinary writing instrument.
If you use it with force and press it against the paper surface A with the force necessary to erase the typographical error smoothly, the eraser 2 has the property of shrinking under elasticity due to its material. In the above, the protruding state is such that only the protruding eraser 2 touches the sheet and the erroneous writing can be erased without the edge of the feeding port 3 making contact with the sheet. Therefore, the protrusion amount L from the feeding port 3 at the spherical tip of the rod-shaped core body 4 is most preferably in the protruding state in consideration of the above-mentioned use conditions.
In other words, the above-mentioned protrusion amount L is most preferable for feeding the eraser 2 from the feeding port 3.

Therefore, according to the slide type eraser of the present embodiment constructed as described above, the protruding state of the spherical tip 4-2 of the rod-shaped core body 4 protruding from the tip feeding port 3 of the barrel 1 is controlled by the slide operating portion 7. Since it serves as a guideline for the stick-shaped eraser 2 to be projected from the tip feeding port 3, the user can easily remove erroneous notes by feeding the stick-shaped eraser 2 according to the protruding state of the spherical tip 4-2 of the rod-shaped core body 4. The stick-shaped eraser 2 can be used by protruding from the feeding port 3 in the best (constant) protruding state. The protruding portion of the rod-shaped eraser 2 protruding from the feeding port 3 is the spherical tip 4-2 of the rod-shaped core body 4.
Since it is held from inside by the part, the paper surface A
Even if the pressing force is large or small, especially when the pressing force is large, there is no concern that the product will be deformed like a broken piece. Thereby,
The user can erase the erroneous writing smoothly while pressing the eraser 2 more than enough on the paper surface A (see FIG. 2). In addition, the stick-shaped eraser 2 can be used while being gradually extended from the inside of the barrel 1 and protruding without being broken and wasted.

4 to 5 show another embodiment of the slide type eraser. In this embodiment, the eraser 2 projected from the leading end feeding port 3 is pressed against the sheet surface A to erase erroneous writing. Even when the eraser 2 is worn out, the protruding state of the rod-shaped core body 4 from the feeding port 3 on the spherical tip 4-2 side is displaced backward into the barrel 1 according to the worn state. The spherical tip 4-2 of the rod-shaped core body 4 is exposed to the outside to obstruct the work of erasing it, and there is no fear of hitting the paper strongly and damaging the paper. Since the configuration is the same as that described above, the same components are designated by the same reference numerals, and the description thereof will be omitted. The different components will be described below.

The rod-shaped core body 4 is inserted into the barrel 1 so as to be able to move forward and backward, and the rear end collar 4-1 of the core body 4 is inserted into the barrel 1.
The rear end opening edge is butt-engaged with the rear end opening so as to be movable in and out of contact with the rear end opening edge, while a space of an appropriate size L-1 is secured from the rear end opening edge, that is, the front end of the barrel 1 is extended. A dimension corresponding to the protrusion amount L of the spherical tip 4-2 of the rod-shaped core body 4 protruding from the mouth 3.
A tail plug 5 formed to have a length (size) that secures a space of L-1 is mounted on the cap 5, and a spring 12 is used to elastically bias the core body 4 in the forward direction in the tail plug 5. The spherical tip 4-2 of the rod-shaped core body 4 is retained from the tip feeding port 3 of the shaft cylinder 1 by the elastic force of the spring 12, and a load is applied to the spherical tip 4-2. In such a case, the tip end 4-2 of the spherical surface is set back and forth in the barrel 1 against the resilience of the spring 12.

The tail plug 5 is concentric with the rear end collar 4-1 of the rod-shaped core body 4 which is abutted against the opening edge of the rear end of the shaft cylinder 1 when the rear end of the shaft cylinder 1 is completely capped. The spherical tip 4-2 of the body 4 is the barrel 1.
L-1 which can be retracted almost completely
Is formed by using a hard resin such as a thermoplastic resin in a cylinder length that secures the space of
The plug bottom facing 4-1 is provided with a convex portion 14 for locking the end of the spring 12 similarly to the convex portion 13 provided on the collar 4-1. The rod-shaped core body 4 is elastically biased in the forward direction by elastically mounting the spring 12 over the area. The tail plug 5 is attached to the rear end of the barrel 1 by fitting it into a fitting step portion 10-1 provided at the rear end.

The elastic force of the spring 12 is set to be smaller than the pressing force of the eraser 2 against the sheet surface A,
When the eraser 2 protruding from the feeding port 3 is pressed against the sheet surface A to erase the erroneous writing, the eraser 2 is worn out and the inner spherical tip 4-2 comes into contact with the sheet surface A.
The rod-shaped core body 4 is elastically biased in the forward movement direction so that the spherical tip 4-2 retracts and retracts into the barrel 1. That is, the amount of protrusion from the feeding opening 3 of the spherical tip 4-2 is the eraser 2
The rearward displacement is made in accordance with the decreasing state of.

Therefore, according to the sliding type eraser of the present embodiment constructed as described above, the eraser 2 which is extended and protruded in the best protruding state from the tip end feeding port 3 of the barrel 1 is pressed against the sheet surface A and is erroneously written. If the eraser 2 wears out during the work, the rod-shaped core body 4 is retracted against the elastic force of the spring 12 in accordance with the worn state, and the spherical tip 4-2 from the feeding port 3 Since the protrusion amount L is displaced, the spherical tip 4-2 does not hinder the erasing work and does not scratch the sheet by being caught on the sheet surface A (see FIG. 5).

FIGS. 6 to 7 show an outer pipe 15-1 having a feeding port 16 for a shaft cylinder 15 and a pipe 17-1 in which a spring 17 is elastically urged in a backward direction to freely move back and forth. The eraser 2 and the eraser 2 are inserted into the cylinder
The rod-shaped core body 4 for supporting in a penetrating manner and the inner pipe 15-2 inserted coaxially and internally, and the outer pipe 15
-1 Inner pipe 15-2 protruding from the rear end is knocked by the knocking operation part 18 at the rear end of the pipe 15-2 against the resilience of the spring 17 and repeated by the thumb operation like a normal knocking writing instrument. By pushing and moving the inner pipe 15-2 back and forth to reciprocate, the engagement and disengagement with the tightening sleeve 19 slidably fitted in the tip feeding port 16 of the outer pipe 15-1 (cooperation ) Of the inner pipe 15-2 for gripping the eraser 2 by a chuck 20 at the tip of the eraser 2, the knockable movable eraser (hereinafter referred to simply as the knock-type eraser) is constructed so that the eraser 2 is gradually fed out from the tip feeding port 16 and projected. ) Is shown.

Outer pipe 15-1 and inner pipe 15
-2 is formed of a hard resin such as thermoplastic resin, and the outer pipe 15-1 is formed with a recess 21 on the inner peripheral surface of the distal end feeding port 16 for restricting the axially slidable advance / retreat range of the tightening sleeve 19. Is provided in a ring shape, and this recess
With the rear end locking collar 19-1 of the tightening sleeve 19 in the sleeve 21, the sleeve 19 is axially slidably fitted and mounted in the feeding port 16, and the rear end locking collar 19-1 is recessed. By colliding with the rear step 21-1 of the 21 side, its retreat is restricted, and the front side step of the recess 21
By advancing to 21-2, its progress is regulated. That is, as will be described later, the rear end locking collar of the tightening sleeve 19
Eraser 2 in cooperation with the chuck 20 at the tip of the inner pipe 15-2 when 19-1 collides with the front step 21-2 of the recess 21.
The operation of feeding out from the feeding port 16 is canceled. Further, a locking step portion 22 for locking one end side of the spring 17 is formed on the inner peripheral surface further on the inner side of the recess 21, and the inner diameter (inner diameter from the locking step portion 22 to the rear end opening is form)
Are formed in a straight shape having the same diameter, and a clip 23 is integrally provided on the outer side of the rear end side. On the other hand, the inner pipe 15-2 is integrally provided with a chuck 20 formed by being divided in the circumferential direction at the tip end side, and a locking step portion for locking the other end side of the spring 17 outside the substantially middle part in the cylindrical direction thereof. The outer pipe 15 is formed outside the rear end opening.
-1 is formed with a screw portion 25 into which the tail plug 27 is screwed in and attached to the crown in a state of protruding from the rear end opening.

Then, the rod-shaped eraser 2 having the through shaft hole 2-1 in the shaft center is inserted into the outer pipe 15-1 so as to be able to move forward and backward, and is inserted from the rear end opening of the inner pipe 15-2. After being inserted into 15-2 and inserted therein, the rod-shaped core body 4 is also inserted from the rear end opening toward the tip chuck 20 so as to penetrate the through shaft hole 2-1 of the rod-shaped eraser 2, and the rear end collar 4- 1
The inner pipe 15-2 by abutting the rear end opening edge and attaching the tail plug 27 which becomes the knock operation portion 18 to the opening.
The rear end collar 4-1 of the rod-shaped core body 4 is fixed to the rear end opening, and the rod-shaped eraser 2 is supported in the pipe 15-2 in a penetrating manner coaxially and with the spherical tip 4-2 side. , Inner pipe 15
-2 Outer pipe 15-1 with the tip of chuck 20 at the tip protruding
The rod-shaped core body 4 can be attached to the inner pipe 15-2 in a state in which the rod-shaped core body 4 is protruded from the tip feeding port 16 by a desired protrusion amount L.

Therefore, according to the knock type eraser of the present embodiment constructed as described above, like the slide type eraser described above, the rod-shaped core projecting from the tip feeding port 16 of the outer pipe 15-1 constituting the barrel 15 is formed. Since the projecting state of the spherical tip 4-2 of the body 4 serves as a guide for the stick-shaped eraser 2 that is projected by the knock operation portion 18 from the tip feeding port 16 in cooperation with the chuck 20 and the tightening sleeve 19, the user is required to stick to the rod-shaped core. A stick-shaped eraser 2 according to the protruding state of the spherical tip 4-2 of the body 4.
It is possible to use the stick-shaped eraser 2 by projecting it from the payout opening 16 in the best (constant) protruding state in which it is easy to eliminate erroneous writing. The protruding portion of the rod-shaped eraser 2 protruding from the feeding port 16 is the spherical tip of the rod-shaped core body 4.
Since it is held from the inside by the 4-2 parts, there is no concern that the pressing force on the paper surface A is large or small, especially even if the pressing force is large, it may be broken and deformed. As a result, the user can smoothly erase the erroneous writing while pressing the eraser 2 against the paper surface A more than enough, and the stick-shaped eraser 2 is gradually extended from the inside of the barrel 15 without being broken and wasted. Can be used while

FIG. 7 shows another embodiment of the knock type eraser. In such an embodiment, the eraser 2 is pushed in the process of pressing the eraser 2 projected from the tip feeding port 16 against the sheet surface A to erase erroneous writing. Even when worn out, the rod-shaped core body 4 is configured so that the protruding state from the feeding port 16 on the spherical tip 4-2 side of the rod-shaped core body 4 is displaced backward into the inner pipe 15-2 according to the worn state. The spherical tip 4-2 of the core body 4 is exposed to the outside to obstruct the work of erasing it, and there is no fear of hitting the paper strongly and damaging the paper. The basic configuration is as described above. Since the configuration is the same as that described above, the same components are denoted by the same reference numerals, and the description thereof will be omitted. The different components will be described below.

The rod-shaped core 4 described above is attached to the inner pipe 15-2.
The rear end collar of the concentric body 4 is inserted thereinto so that it can be moved back and forth freely.
While the 4-1 is abuttingly engaged with the rear end opening edge of the pipe 15-2 so as to be movable in and out of contact with the rear end opening edge, a space of an appropriate size L-1 is secured from the opening edge at the rear end opening. The tail plug 27 formed in a length (size) is attached to the cap, and the spring 26 is mounted in the tail plug 27 so as to elastically bias the core body 4 in the forward direction.
When the spherical tip 4-2 of the rod-shaped core body 4 is kept protruding from the tip feeding port 16 of the outer pipe 15-1 by the elastic force of the spring 26, and a load is applied to the spherical tip 4-2. Against the resilience of the spring 26, the spherical tip 4-2 retracts into and retracts from the inner pipe 15-2.

The elastic force of the spring 26 is set to be smaller than the pressing force of the eraser 2 against the paper surface A,
When the eraser 2 protruding from the feeding port 16 is pressed against the sheet surface A to erase the erroneous writing, the eraser 2 is worn out and the inner spherical tip 4-2 contacts the sheet surface A.
The spherical core tip 4-2 elastically biases the rod-shaped core body 4 in its forward direction so that the spherical core tip 4-2 retracts and retracts into the inner pipe 15-2. That is, the amount L of protrusion of the spherical tip 4-2 from the feeding port 16 is displaced backward according to the state of the eraser 2.

The inner core 15-2 is fitted between the rear end flange 4-1 and the rod-shaped core 4 which is engaged with the rear opening edge of the inner pipe 15-2.
The spherical tip 4-2 of the rear end of the tail plug 27, which is formed to have a tube length such that a space of dimension L-1 necessary for the retreat that allows the tip of the spherical tip 4-2 to retract substantially completely into the inner pipe 15-2, is Similar to the convex portion 28 provided on the rear end collar 4-1 of the rod-shaped core body 4, a convex portion 29 for locking the end portion of the spring 26 is provided, and the spring 26 extends between the convex portion 29 and the convex portion 28. The rod-shaped core body 4 is elastically biased in the forward direction by mounting. In addition, the crown is attached to the rear end of the inner pipe 15-2 of the tail plug 27 by the fitting step portion provided at the rear end.
It is configured by fitting it into 25-1.

Therefore, according to the knock type eraser of this embodiment constructed as described above, the eraser 2 which is extended and projected from the tip feeding port 16 of the outer pipe 15-1 in the best protruding state is pressed against the sheet surface A. If the eraser 2 is worn out during the work, the rod-shaped core body 4 will be removed according to the reduced state like the slide type eraser described above.
Retracts against the elastic force of the spring 26 and feeds
Since the protrusion amount L of the spherical tip 4-2 from 16 is displaced, the spherical tip 4-2 does not interfere with the erasing work or get caught on the paper surface A and scratch the same paper.

[0028]

Since the movable eraser of the present invention is constructed as described above, it has the following operational effects. ． When the stick-shaped eraser is projected from the tip-end feed-out port of the barrel, the protruding part of the eraser is held from the inside by the rod-shaped core that is present from the feed-out port. Even if it is pressed, it will not be deformed as if it were broken. Then, by setting the protrusion amount of the rod-shaped core body from the tip feeding port to the feeding protrusion amount of the best eraser that can erase erroneous smoothly, the user can set the protruding state of the rod-shaped core body. As a guide, the eraser can be extended and protruded from the barrel, and the user can always use the eraser in the best (constant) protruding state in which mistakes can be easily erased. ． Even if the eraser is worn out in the process of erasing erroneous data by pressing the eraser protruding from the tip feeding port of the barrel to the paper surface, the protruding state of the rod-shaped core from the tip feeding port can be changed according to the reduced state. Since it is displaced backwards against the elastic force of the spring, there is no fear that the rod-shaped core will obstruct the erasing operation or damage the paper surface.

Therefore, according to the movable eraser of the present invention, since the eraser which is extended and projected from the tip end feeding port of the shaft cylinder does not become deformed, the eraser is irrespective of the pressing force against the sheet surface. You can press it freely to erase mistakes smoothly. Moreover,
The protruding portion of the rod-shaped core protruding from the tip feeding port serves as a guide for feeding out the eraser, and the user can use the eraser in the best protruding state so that erroneous writing can be smoothly erased. Furthermore, the amount of protrusion from the tip-end feed-out port of the rod-shaped core that prevents the eraser from deforming moves backward as the eraser decreases, which may interfere with the operation of erasing the erroneous writing or hit the paper surface strongly. It is possible to obtain various effects, such as no risk of being damaged.

[Brief description of drawings]

FIG. 1 shows an example of implementation of a sliding eraser,
(A) is a vertical side view, (b) is a front view, and (c) is an enlarged sectional view along the ha-ha line of (b).

FIG. 2 is a front view showing a usage state, with a part cut away.

FIG. 3 is a perspective view showing a slide operation portion of a slide type eraser.

FIG. 4 is a vertical sectional side view showing another embodiment of the sliding eraser.

FIG. 5 is a vertical sectional side view showing the usage state.

FIG. 6 is a vertical sectional view showing an example of implementation of a knock-type eraser.

FIG. 7 is a vertical sectional view showing another embodiment of the knock-type eraser.

FIG. 8 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

1, 15 ... Shaft cylinder 2 ... Rod eraser 2-1 ... Shaft hole 3, 16 ... Tip feeding port 4 ... Rod core 12, 26 ... Spring A ... Paper surface

Claims (2)

[Claims] 1. A movable eraser in which a rod-shaped eraser is inserted into and retracted from a tip-end feeding port of a coaxial cylinder, wherein a rod-shaped core body is coaxially inserted into the barrel. Then, a rod-shaped eraser is supported in a penetrating manner on the core body, and the eraser is inserted into and retracted from the tip feeding port into the shaft cylinder so that the rod-shaped core body is a hard member over substantially the entire length of the shaft cylinder. The rod-shaped eraser is attached to the shaft core from the front end while the other end is supported at the rear end of the shaft cylinder while the one end of the rod is protruded from the tip end feeding port of the shaft cylinder by a desired protrusion amount. A movable eraser, characterized in that a shaft hole for inserting the core body is provided which penetrates toward a rear end portion. 2. The movable eraser according to claim 1, wherein the rod-shaped core body is inserted in the barrel so as to be able to move forward and backward, and the other end of the core body is projected from the rear end of the barrel to form the rear end. While it is abuttingly engaged with and separated from the end, a tail plug is attached to the rear end of the shaft cylinder to elastically urge the core body in the forward direction in the tail plug. A movable eraser, which is equipped with a spring whose elastic force is set to be smaller than the pressing force of the eraser against the paper surface.