KR20160136974A

KR20160136974A - Cut-off Wheel for Hand Grinder

Info

Publication number: KR20160136974A
Application number: KR1020150071308A
Authority: KR
Inventors: 탁우찬
Original assignee: 탁우찬
Priority date: 2015-05-21
Filing date: 2015-05-21
Publication date: 2016-11-30

Abstract

The present invention discloses a cutting stone for a hand grinder.
The cutting stone for a hand grinder according to the present invention is a disc grinding stone for a hand grinder, which comprises a disk-shaped disk body having a fastening hole formed at the center thereof by mixing a cutting material and a binder to cut the workpiece by rotating at a high speed, A fiber material or a synthetic resin material is formed to have a thickness of 0.5 to 2.0 mm and a through hole corresponding to the fastening hole is formed at the center thereof so as to have an annular shape, And a reinforcing pad having an exposed surface on which the character or the image is printed is formed on one surface of the cutting stone to form an adhesive surface coated with an adhesive so as to be adhered to the cutting stone by an adhesive force.
The cutting stone for a hand grinder thus constructed can reinforce the edge of the fastening hole in which the clamp comes into contact while maintaining the weight reduction through the simple structure of attaching reinforcement pads made of paper or synthetic resin to both sides of the fastening hole As a result, it is possible to suppress local deformation or damage of the contact portion due to the clamping force of the clamp, thereby preventing the occurrence of eccentricity during high-speed rotation.
In addition, since it is adhered in the form of a sticker, it is easy to manufacture and economical manufacturing is possible, and it is expected to have a useful effect of enhancing the competitiveness and reliability of the product for the cutting stone applied thereto.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter wheel for a hand grinder,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting stone used by being mounted on a small hand grinder for holding an operator by hand and cutting a variety of cutting objects made of a metal plate, , It is possible to prevent local deformation and damage due to excessive clamping force in the state of being fixed to the clamp, thereby eliminating the clogging due to the eccentricity during high-speed rotation and achieving economical manufacturing with a simple structure while maintaining light weight To a cutting stone for a hand grinder.

Generally, a hand grinder is a power tool used for cutting or cutting an object such as a steel pipe or a metal plate by using a disk-shaped grinding stone or a cutting stone rotating at high speed while being held by a hand by an operator, to be.

Such a hand grinder includes a main body having a handle formed by a worker so as to be held by a hand, a motor provided inside the main body and driven to rotate at a high speed by receiving power from the outside, and a grindstone / A clamp for supporting the cutting stone detachably.

As a structure for fastening a polishing disk to a rotary shaft of a hand grinder according to the related art, Korean Utility Model Publication No. 20-1989-010365 and 20-1996-026826 disclose a structure in which a polishing disk is inserted on a rotating shaft mounted in a body of a grinder There is proposed a method in which a fixing screw is fixed by using a nut or a bolt is fixed by being fastened to a rotary shaft and a method of fastening and supporting a polishing disk by a screw fastening structure on the rotary shaft is applied to most hand grinders.

In the hand grinder according to the related art, as the grinding disk is fastened to the grinder main body using a clamp having a bolt or nut structure, the fastening force is lowered due to frictional force or vibration of the grinding disk rotating at high speed, There was a risk of safety accident.

The hand grinder of this structure is designed to enclose a part of the polishing disk with a fixed cover to reduce the risk of a safety accident caused by the breakage of the polishing disk. However, the risk of a safety accident due to the breakage of the polishing disk rotating at high speed But the vibration due to the eccentricity of the polishing disk and irregular cutting surfaces can not be solved.

Another conventional technique is disclosed in Korean Patent Registration No. 10-1483963, entitled " Grinding Disc Grinding Apparatus for Hand Grinder ", and Claim 1 of the present invention discloses a grinding apparatus for grinding a grinding disc, A power transmitting member which is formed with a hexagonal body including a flange at a central portion of the body and is fastened as a fixing bolt on a rotating shaft of the grinder main body, And a pair of upper and lower swing plates fitted in the flat plate portion of the upper end of the stopper body, and a pair of upper and lower swing plates, And a disk holder made up of an upper retaining ring and a lower support plate for fixing the abrasive material at the same time, And a pair of safety keys moving up and down on the reinforcing plate are mounted on the stopper main body, and the upper and lower pivot plates mounted on the stopper body are provided with a pair of A grinding disk removing and attaching device for a hand grinder is disclosed in which a rotary key is mounted.

However, since most of the hand grinder is used for polishing, a polishing disc having a central portion formed with a fastening hole protruding to one side can be mounted. Therefore, in the case of a cutting stone having a flat shape on both sides, There are disadvantages that are not solid.

In other words, most hand grinders have a structure for fixing and supporting a polishing disc or a cutting stone, and are provided with a flange provided on a rotary shaft of a motor, and a fixture screwed to a flange at one side of the flange, And the flange is in contact with the polishing disc or the cutting stone in a relatively large area relative to the fixing bolt. When the cutting stone is mounted due to such a structure, The eccentricity is easily generated as the pressing force is excessively applied to the flange side and is locally pressed to the opposite side.

On the other hand, the cutting stone used for the hand grinder is widely used such as a synthetic resin material such as fiberglass and a mineral component such as zirconium, having a thickness of 0.5 to 2.0 mm and a diameter of 4 to 5 inches. In the case of such a cutting stone, The circumferential surface is used to cut the workpiece, so that both surfaces are provided in the same flat manner.

If the balance of the cutting stone is lost due to eccentricity, it can not be precisely cut as it is rotated in a specific direction, which poses a serious threat to safety. Therefore, eccentricity is strictly controlled at the time of manufacture. However, Due to the structural characteristics, the thin slabs having a thin thickness have a problem in that local deformation occurs around the fastening holes, resulting in eccentricity.

That is, when the cutting stone is rotated at a high speed in a state of being eccentrically rotated, the circumferential surface, which is the cutting surface, cuts the workpiece in a state in which the cutting stone is severely swung left and right. · It causes irregular friction with the workpiece in the state of right shaking, so that the tearing or tearing part is partially removed, shortening the life span, and there is a serious problem of causing a safety accident when the workpiece is splashed.

In order to solve such a problem, a washer-type metal ring is inserted into the flange and the fixing bolt, respectively, and arranged in front of and behind the cutting stone. However, since the metal ring must be inserted or removed when the grinding stone is detached or attached, When used, the metal ring must be stored separately so as not to be lost, so the use thereof is avoided.

Therefore, it is urgent to develop a cutting stone for a hand grinder capable of reducing production of eccentricity due to clamping force of the clamp while maintaining weight reduction by minimizing weight increase of the cutting stone, and economical manufacturing by a simple structure It is true.

Public utility model publication room 1998-0006972, page 2, claim 1, figure 2. Open Patent Publication No. 2002-0024061, page 3, Claim 1, Fig. 2.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide a clamping device capable of preventing local deformation and breakage due to a clamping force of a clamp while maintaining weight reduction, And to provide a cutting stone for a hand grinder capable of economical manufacture.

A cutting stone for a hand grinder according to a preferred embodiment of the present invention for realizing the above object is a cutting stone for a hand grinder which has a disk shape in which a cutting material and a binder are mixed by rotating at a high speed to cut a workpiece, A cut grinding stone for a hand grinder, wherein a paper material, a fiber material, or a synthetic resin material is formed to have a thickness of 0.5 to 2.0 mm, and a through hole corresponding to the above- And a reinforcing pad having an exposed surface on which the character or the image is printed is formed on the other surface.

In a preferred aspect of the present invention, the reinforcing pad has a plurality of protruding strip portions spaced from each other concentrically around the through hole at the bulging surface side, wherein the height of the protruding strip portion is 0.2 to 1 mm.

In another preferred aspect of the present invention, the reinforcing pad has a ring-shaped central portion in which the through hole is formed at the center, and a comb-like projection extending radially outward along the rim of the central portion and radially disposed around the through- .

The cutting stone for a hand grinder according to the present invention can reinforce the edge of the fastening hole with which the clamp comes in contact while maintaining the weight reduction through the simple structure of attaching the reinforcing pad made of paper or synthetic resin to both sides of the fastening hole As a result, it is possible to suppress local deformation or damage of the contact portion due to the clamping force of the clamp, thereby preventing the occurrence of eccentricity during high-speed rotation.

In addition, since it is adhered in the form of a sticker, it is easy to manufacture and economical manufacturing is possible, and it is expected to have a useful effect of enhancing the competitiveness and reliability of the product for the cutting stone applied thereto.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

1 is a perspective view showing a cutting stone for a hand grinder according to the present invention,
2 is an exploded perspective view showing a state in which a reinforcing pad is separated from a cutting stone for a hand grinder according to the present invention,
3 is a perspective view showing another embodiment of a cutting stone for a hand grinder according to the present invention,
4 is a perspective view showing still another embodiment of a cutting stone for a hand grinder according to the present invention.

Hereinafter, a cutting stone for a hand grinder according to the present invention will be described with reference to the accompanying drawings. First, it should be noted that the same components or parts among the drawings are denoted by the same reference numerals as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 and 2 are perspective views showing a preferred embodiment of a cutting stone for a hand grinder according to the present invention, wherein the cutting stone 1 for a hand grinder, which is fixed to a clamp of a hand grinder and cuts or cuts the work, Respectively.

Hereinafter, a configuration of a cutting stone for a hand grinder according to the present invention will be described with reference to the drawings.

First, a cutting stone (1) for a hand grinder according to the present invention is a cutting element mounted on a known hand grinder for cutting and cutting a workpiece by high-speed rotation, A flange having a boss protrudingly formed at a center thereof and integrally connected to the rotation shaft of the motor, and a fixing bolt screwed to the boss portion of the flange at the opposite side with a cutting stone seated on the flange, Since such a hand grinder is implemented by a known technique, a detailed description thereof will be omitted.

The cutting stone fixed and supported by the clamp of the hand grinder and rotated at a high speed is formed by mixing a binder made of synthetic resin such as fiberglass and a cutting material made of a mineral component such as zirconium to a thickness of 0.5 to 2.0 mm and a diameter of 4 to 5 inches And a fastening hole is formed at the center thereof so as to have a size and both surfaces are provided in a flat shape. Since such a cut stone is implemented by a known technique, a detailed description is omitted.

The cutting stone (1) for a hand grinder of the present invention performs a substantial cutting and cutting operation while forming a whole outer shape, and has a mounting body (10) having a fastening hole to be fixed to a clamp of a hand grinder Thereby preventing local deformation and damage to the periphery of the fastening hole of the disk body 10 due to the fastening force during the process of fixing the disk body 10 constituting the cutting stone to the clamp, And a reinforcing pad 20 for minimizing the thickness of the reinforcing pad 20 is additionally provided.

The reinforcing pad 20 is a ring-shaped element having a size of about 30 to 70% with respect to the disk body 10, and is made of a fibrous material such as a paper material or a nonwoven fabric, or a sheet or film- mm.

The reinforcement pad 20 has a through hole 21 formed at the center thereof and having a size corresponding to the fastening hole formed at the center of the disk body 10.

One side of the reinforcing pad 20 forms an adhesive surface 25 on which an adhesive is applied so as to be adhered to the disk body 10 by an adhesive force and the opposite side thereof is a side exposed to the outside. An exposed surface 23 on which letters, images and the like are printed is formed.

The reinforcing pad 20 having such a structure is attached to both side surfaces of the disc body 10 of the cutting stone 1 for the hand grinder and reinforces the rigidity of the periphery of the fastening hole to which the clamp of the hand grinder is in contact, It is possible to prevent eccentricity from occurring due to local deformation or damage of the peripheral portion of the hole.

Further, since the reinforcing pad 20 is provided as a paper material, a fiber material, or a synthetic resin material, even when an excessive assembling force is applied to the hand grinder, the reinforcing pad 20 is attached Thereby preventing local deformation or breakage of the periphery of the fastening hole of the disk body 10.

Also, even if the disk body 10 with the reinforcing pad 20 attached thereto is conveyed around the fastening hole of the disk body 10 due to friction with the workpiece when the disk body 10 rotates at high speed, Is more shock-absorbing due to its material properties than the disk body 10, and consequently attains stable high-speed rotation by attenuating external force or vibration transmitted to the periphery of the fastening hole.

FIG. 3 is a perspective view showing another embodiment of a cutting stone for a hand grinder according to the present invention, in which a plurality of annular protruding strip portions 27 are formed concentrically protruding from the exposed surface 23 of the reinforcing pad 20 will be.

The reinforcing pad 20 of the present invention has a technical feature in that a plurality of protruding strip portions 27 are formed on the exposed surface 23 side with a space concentric with the through hole 21 as a center.

As shown in the drawing, the protruding band portion 27 in the present embodiment is preferably a portion that gradually extends from the through hole 21 and protrudes upward, and has a protruding height of 0.5 to 1.0 mm.

The reinforcing pad 20 having the protruding strip portion 27 is provided as a paper material, a fiber material, or a synthetic resin material in the same manner as the above-described embodiment. In the case of a paper material or a fibrous material, the reinforcing pad 20 is formed by press working, It can be molded through injection.

Even when excessive assembling force is applied to the hand grinder, the reinforcing pad 20 having such a structure has a higher elasticity than the disk body 10, so that the assembling force applied to the periphery of the fastening hole of the disk body 10 So that it is possible to prevent local deformation or breakage of the periphery of the fastening hole of the disk body 10.

When the disk body 10 with the reinforcing pads 20 having the plurality of protruding strip portions 27 attached thereto is rotated at a high speed, vibrations and external forces due to the frictional force generated in the cutting process are transmitted to the periphery of the fastening holes, Since the reinforcing pad 20 having the protruding strip portion 27 has a high buffering property with respect to the disc body 10, it can attenuate vibrations and external forces transmitted to the periphery of the fastening hole to enable stable high-speed rotation.

Particularly, since the reinforcing pads 20 in this embodiment have a plurality of protruding strip portions 27 formed in a concentric shape, the thickness of the reinforcing pads 20 can be partially increased without increasing the weight as compared with the above- It is expected to have an effect of enhancing the cushioning property.

Fig. 4 is a perspective view showing still another embodiment of a cutting stone for a hand grinder according to the present invention, and shows another embodiment in which the comb teeth protrusion 29 protrudes in the radial direction.

The reinforcing pad 20 according to the present embodiment has a central portion 28 having an annular shape with a through hole 21 formed at a central portion thereof and a plurality of comb teeth protrusions 28 extending in the outward direction along the rim of the central portion 28 29) are formed on the surface.

The comb teeth projection 29 in this embodiment is arranged radially extending around the through hole 21, and preferably has a height of 0.2 to 1.0 mm.

The comb teeth protrusion 29 is provided as a paper material, a fiber material, or a synthetic resin material in the same manner as the protruding strip portion 27 described above. In the case of a paper material or a fibrous material, the comb tooth protrusion 29 is formed by press working. In the case of a synthetic resin, Can be molded.

Even when excessive assembling force is applied to the hand grinder, the reinforcing pad 20 having such a structure has a higher elasticity than the disk body 10, so that the assembling force applied to the periphery of the fastening hole of the disk body 10 Can be dispersed and buffered through the comb-like projecting portion (29). As a result, it is possible to prevent local deformation or breakage of the periphery of the fastening hole of the disk body (10).

The disk body 10 with the reinforcing pads 20 on which the comb teeth projections 29 are formed has vibration and external force transmitted to the periphery of the fastening holes when the disk body is rotated at a high speed, Since the reinforcing pad 20 having the protruding strip portion 27 has a high buffering property with respect to the disc body 10, it can attenuate vibrations and external forces transmitted to the periphery of the fastening hole to enable stable high-speed rotation.

Particularly, the reinforcing pad 20 in the present embodiment has a plurality of comb-like projecting portions 29 extending in a radial direction, so that the strength of the reinforcing pad 20 can be improved without increasing the overall weight of the reinforcing pad 20 as compared with the above- It is expected that the buffering property can be enhanced.

It is to be understood that the present invention is not limited to the disclosed embodiment and that various changes and modifications may be made without departing from the spirit and scope of the present invention as set forth in the appended claims. It is obvious to those who have knowledge. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

1: Cutting stone for hand grinder
10: disc body
20: reinforcing pad
21: Through hole
23: exposed surface
25: Adhesive face
27:
29: comb tooth protrusion

Claims

A cutting tool for a hand grinder, comprising a disc body formed by mixing a cutting material and a binder and forming a fastening hole in the center by rotating at a high speed to cut the workpiece,
And is formed to have a thickness of 0.5 to 2.0 mm and has a through hole corresponding to the fastening hole formed at the center thereof so as to have an annular shape And a reinforcement pad formed on one surface thereof with an adhesive surface coated with an adhesive so as to be adhered to the disk body by an adhesive force and having an exposed surface printed with letters or images on the other surface thereof.

2. The hand grinder according to claim 1, wherein the reinforcing pad has a plurality of protruding strips spaced concentrically around the through hole at the exposed surface side, the height of the protruding strip is 0.2 to 1 mm, Cutting stone for.

The reinforcing pad according to claim 1, wherein the reinforcing pad has an annular central portion (28) having the through hole (21) formed at the center thereof and a through hole (21) extending in the outward direction along the rim of the central portion (28) Wherein a comb-like projection (29) is arranged radially around the center of the comb-like projection.