WO2020045955A1

WO2020045955A1 - Hand grinder disk fixation device

Info

Publication number: WO2020045955A1
Application number: PCT/KR2019/010936
Authority: WO
Inventors: 김점용
Original assignee: 김점용
Priority date: 2018-08-27
Filing date: 2019-08-27
Publication date: 2020-03-05
Also published as: KR20200024384A

Abstract

The present invention relates to a hand grinder disk fixation device, which allows a cutting disk or grinding disk mounted on a hand grinder to be easily replaced and allows replacement work to be safely performed. More specifically, the present invention relates to a hand grinder disk fixation device wherein: when a disk is fitted and rotated in a state in which a fixed drum and an actuator are assembled, the disk is fixed to a hand grinder while the actuator and the disk are rotated together, and the disk is thus easily fixed by one touch and is firmly fixed so as not to move freely during the use of the hand grinder; and the structure of a coupler is slimmed to allow a dedicated disk and a normal disk to be compatibly used.

Description

Disk holder of hand grinder.

The present invention relates to a disk fixing device for fixing a disk for cutting or polishing to a hand grinder, and more particularly, to a disk fixing device of a hand grinder which allows for easy and safe disk replacement. .

In general, a hand grinder is a tool used to cut a metal workpiece or a structure, or to smoothly polish a surface. A hand grinder has a rotating shaft provided in a main body, and a coupler is mounted on the rotating shaft to use a coupler to cut or polish a cutting blade. The wheel with the blade, that is, the disk is fastened, and the cutting or polishing operation can be performed while rotating the rotating shaft at high speed by using a motor or a compressor.

The disk mounted on the hand grinder has a disc shape and a mounting hole is formed at the center thereof to be fixed to the rotating shaft of the hand grinder. In the related art, a method of fixing by using a nut is used. In the case of grinding for a long time, there was a problem that the nut and the disk are stuck and cannot be easily separated.

Therefore, in recent years, various types of disk fixing devices have been proposed, but there is a problem in that the disk is not securely fixed or the disk fixing structure is too complicated to use.

Therefore, the applicant of the present invention in the Republic of Korea Patent Registration No. 1838740 (2018.03.08) to assemble the disk meshes with the first body portion and the second body portion, and the elastic portion in the linear motion portion to which the first body portion and the second body portion is mounted It has been proposed to fix the disk by one touch by the elastic restoring force of the elastic part, and on the contrary, when the disk is separated, a disk fixing device has been proposed that can be separated by one touch by pressing the disk surface.

By the way, the fixing method by the elastic restoring force does not have a problem when using a cutting disk, but a problem occurs when using a polishing disk.

In other words, the polishing work is to smooth the less processed parts or rough surfaces in the state where the primary processing is completed, and the surface polishing is performed only by pressing the surface of the workpiece with a strong force. In the one-touch fixing method, there is a problem that play occurs in the fixed state of the disk due to vibration, and this also causes a problem that the fixed state is unstable and the precision of processing is inferior.

In addition, since the structure of the coupler is long and high because of its structure, the height of the coupler is so high that it is assembled so that the rotating shaft of the hand grinder is not exposed. Therefore, only a dedicated disc must be used. There is a limit to use.

The present invention is to solve the above problems, the fixing method of the disk can be easily fixed with one touch, as well as to prevent the phenomenon of the polishing disk shake due to strong vibration acting on the hand grinder during polishing operations such as marble. In this way, accurate and safe grinding can be achieved.

In addition, by simplifying and slimming the structure of the disk fixing device, the rotating shaft of the hand grinder is exposed so that the commercial disk can be used interchangeably.

The present invention as a technical idea for achieving the above object is a cylindrical fixed drum which is fastened in a spiral manner to the rotating shaft of the hand grinder, and is assembled rotatably to the fixed drum, the disk for cutting or polishing is seated and the rotation of the disk The actuator guides to be made, and the mounting wheel provided on the inner circumference of the disk for mounting the disk in the state where the fixed drum and the actuator are assembled, and the fixed drum is separated from the disk mounted state. A fixing part for preventing and an operating guide for controlling the rotation of the actuator, the actuator including a mounting hole formed at the center to insert the fixing drum, and preventing and fixing the idling of the disc in the state where the disk is assembled. The protrusion for inducing coaxial rotation of the drum and the actuator, and the operation guide of the fixed drum It includes an operation section setting section for limiting the radius of rotation of the actuator, the mounting wheel includes an insertion protrusion inserted between the fixed part of the fixed drum and the protrusion of the actuator so that the disk in the fixed drum and the actuator is assembled When inserted and rotated, the actuator and the disc rotate together, allowing the disc to be easily fixed to the hand grinder.

In addition, the fixed drum is formed on the upper side of the fixed drum to be spaced apart from the fixed guide so that the operation guide can accommodate the disk, the plurality of fixed parts and the operation guide at equal intervals along the outer circumference of the fixed drum. It is provided with a fixed portion and the operating guide of the operating body is the upper portion of the operating body is formed with the operating section setting portion, the upper end of the operating body and the fixed drum in the state in which the operating guide of the fixed drum is housed in the operating body The coupler is assembled in a simple structure by having a working plate formed with a protrusion for inducing coaxial rotation of the fixed drum and the actuator without being separated.

In addition, to prevent any rotation between the fixed drum and the actuator and to secure the locking groove formed in the operation guide of the fixed drum in order to check the fastening state of the disk and the steel ball to operate to release the elasticity, the elasticity for imparting elastic restoring force to the steel ball By further comprising a rotation guide means including the ash to allow the user to check the mounting or detachment state when mounting or detaching the disk.

In addition, by operating in a state in which the steel ball and the elastic member of the rotary guide means is formed in a horizontally formed horizontally it is possible to slim the thickness of the coupler.

According to the disk fixing device of the hand grinder of the present invention, since the fixing device is made of a simple configuration, the manufacturing can be simplified, and the assembly structure is made in stages, thereby providing ease of assembly.

In addition, it is convenient to carry and store by miniaturization by minimizing the height while the fixed body and the actuator are assembled, and the rotating shaft of the hand grinder is exposed to the upper part with the coupler mounted on the rotating shaft. It can be used interchangeably, so its utilization is very high.

In addition, since the upper and lower parts of the disk are fixed in close contact with each other, grinding and cutting operations on the workpiece surface are prevented by preventing the disk from shaking at high speed due to the force received from the workpiece surface without any play when the disk is rotated. This is done precisely, improves rotational balance, improves service life and cutting performance, and the disk remains securely fixed for safe use.

In addition, since the operator can directly check the fastening or separation state by the feeling of being caught when mounting or detaching the disk can provide convenience of use.

1 is a perspective view of a hand grinder to which the disk fixing device of the present invention is applied;

Figure 2 is a detailed configuration of the coupler and the mounting wheel of the disk fixing device of the present invention

3 is a perspective view of a coupler of the present invention;

4 is an exploded perspective view of a coupler according to an embodiment of the present invention;

5 is an exploded perspective view of a coupler according to another embodiment of the present invention;

6 is a cross-sectional view of FIG.

7 and 8 is a state diagram used in the disk fixing device of the present invention

9 to 11 is a state diagram showing the operating structure of the rotation guide means of the present invention

Best mode for carrying out the present invention is a cylindrical fixed drum 100 is fastened in a spiral manner to the rotation axis of the hand grinder; An actuator (200) rotatably assembled to the fixed drum (100) and mounted with a cutting or polishing disk to guide the rotation of the disk; It consists of a mounting wheel 300 provided on the inner circumference of the disk for mounting the disk in the assembled state of the fixed drum and the actuator, the fixed drum 100 is used for preventing the departure from the disk mounted state Operation guide 140 for controlling the rotation of the government 120 and the actuator is included, the actuator 200 is a mounting hole 210 formed in the center so that the fixed drum is inserted, the disk is assembled Protruding portion 220 for preventing the disk idling and inducing coaxial rotation of the fixed drum and the actuator, and the operating section setting unit 240 for limiting the rotation radius of the actuator is mounted to the operating guide of the fixed drum It is included, the mounting wheel 300 includes an insertion protrusion 320 is inserted between the fixing part 120 of the fixed drum and the protrusion 220 of the actuator, the disk is fitted in the fixed drum and the actuator assembled state If you rotate it The body and while the disk is rotating with the disk is characterized in that fixed to the hand grinder.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the disc holding device of the hand grinder of the present invention, as shown in FIGS. 1 to 3, a coupler 10 is mounted on a rotating shaft 2 formed on the hand grinder main body 1 so that the disc 3 for cutting or polishing is removed. As configured to be mounted, the coupler 10 may be assembled in a spiral manner formed in the spiral portion formed on the rotating shaft 2, the structure of the coupler 10 is a cylindrical fixed drum 100 mounted to the rotating shaft (2) And an actuator 200 which is assembled with the fixed drum but rotates from the fixed drum, and the mounting wheel of the disc is mounted on the coupler 10 which is configured by the fixed drum 100 and the actuator 200. It can be configured to mount the cutting or polishing disk 3 to the rotary shaft of the hand grinder by inserting (300).

The detailed structure of the coupler 10 is shown in FIG.

The fixed drum 100 is assembled to the rotary shaft 2 of the hand grinder. When the driving motor of the hand grinder is operated, the fixed drum 100 is rotated together by the driving force of the driving motor to transmit the rotational force to the mounting wheel 300.

The fixed drum 100 has a cylindrical shape, and a hole is formed in the center of the cylindrical body so as to penetrate up and down, and a rotating shaft can be fastened in a spiral manner to the rotating shaft 2 of the hand grinder on the inner circumferential surface of the hole. The fastening part 110 may be provided.

In the fixed drum 100, the fixing part 120 may be formed so that the mounting wheel 300 of the disk does not leave the disk 3 in the coupler 10.

The fixing part may be manufactured to protrude along the outer circumference of the cylindrical body of the fixing drum, and the mounting wheel 300 of the disk is mounted on the mounting wheel 300 of the disk to prevent the disk from being detached when the mounting wheel 300 of the disk is detached. The insertion protrusion 320 may be formed to correspond to the government 120.

That is, when the disk is to be mounted on the coupler 10, when the disk is inserted into the coupler, the insertion protrusion 320 is inserted into the coupler so as not to be caught by the fixing part 120, and the disk is inserted into the coupler, and then the Insertion protrusion 320 is located at the bottom of the government 120 so that the disk does not fall to the top.

In addition, the fixed drum 100 may be provided with an operation guide 140 for controlling the radius of rotation of the actuator in the state in which the actuator 200 is assembled.

The operation guide 140 may be manufactured in a shape protruding along the outer circumference of the cylindrical body of the fixed drum, and preferably, a fixing part 120 is formed on the top of the fixed drum 100 to prevent the disk from being separated. At the lower end of the fixed drum 100, an operation guide 140 for controlling the radius of rotation of the actuator may be formed.

That is, the fixed drum 100 may be formed to be spaced apart so that the fixing portion 120 on the upper side of the fixed drum, the operation guide 140 on the lower side of the fixed drum to accommodate the disk, this fixing portion 120 ) And the operation guide 140 may be provided with a plurality of fixed parts and operation guides at equal intervals along the outer circumference of the fixed drum. The insertion protrusion 320 may be configured in plural to correspond to the government.

On the other hand, the actuator 200 is a mounting hole 210 is formed in the center so that the fixed drum is inserted, and the projection for preventing the idle rotation of the disk and the coaxial rotation of the fixed drum and the actuator in the disk assembled state 220, and the operation guide of the fixed drum is mounted may be included in the operation section setting unit 240 for limiting the radius of rotation of the actuator.

The mounting hole 210 is a structure for allowing the fixed drum 100 to be assembled in the center of the actuator 200, and the protrusion 220 is formed in the mounting hole 210 and inclined to be in close contact with the outer circumferential surface of the fixed drum. Coaxial rotation can be induced without.

At this time, the protrusion 220 may be provided to limit the rotation radius of the disk is caught by the insertion protrusion 320 of the mounting wheel (300).

The operation section setting unit 240 is for limiting the rotation radius of the actuator 200 in a state where the fixed drum and the actuator are assembled, and the operation section setting unit 240 rotates when the operation guide 140 is seated. It may be formed to be indented to limit the radius.

Therefore, when the coupler 10 of the fixed drum 100 and the actuator 200 are assembled to the rotating shaft of the hand grinder, the fixed drum 100 rotates when the disc 3 is inserted into the coupler and rotated. The disk is mounted on the hand grinder while the actuator 200 and the mounting wheel 300 of the disk are rotated simultaneously.

On the other hand, the actuator 200 may be separated into the operation body 201 and the operation plate 202 in order to simplify the assembly of the fixed drum 100 and the actuator 200 while being simple.

The operating body 201 is formed in the shape of the upper opening, the operation plate 202 is to be assembled by blocking the open upper portion of the operating body to be assembled to the fixed drum 100 and the actuator in a simple structure As such, the operation body 201 may be provided with the operation section setting unit 240 described above, and the operation plate 202 is not separated from the fixed drum in a state in which the operation guide of the fixed drum is accommodated in the operating body. A protrusion 220 may be formed to induce coaxial rotation of the fixed drum and the actuator.

In this case, the fixing part 120 and the protrusion 220 may be formed in plural at equal intervals along the circumference of the central axis, most preferably formed on the fixed drum 100 and the actuator 200, respectively. Six insertion protrusions 320 may be formed to radially constitute the top 120 and three protrusions 220, respectively, and to insert the insertion protrusion 320 of the disc between the fixing portion and the protrusion.

Therefore, when the disk 3 is fastened to the coupler 10, the mounting wheel 300 of the disk is fixed by holding the upper and lower parts so that the clearance between the fixed drum 100 and the actuator 200 and the mounting wheel 300 does not occur. It can maintain a firm fixed state.

In addition, in the assembly of the fixed drum 100 and the actuator 200, a stepped 180 is formed at the lower end of the fixed drum 100, the lower end of the operating body 201 of the actuator of the hand grinder An inner seat 280 may be formed so that the rotating shaft penetrates and the fixed drum is engaged with the stepped portion.

Therefore, the height of the coupler can be minimized in the state where the fixed body and the actuator are assembled, and the thickness of the coupler can be reduced because the thickness of the coupler in the state where the fixed body and the actuator is assembled is almost the same as the height of the fixed body.

Therefore, the rotating shaft of the hand grinder is exposed to the upper part while the coupler 10 is mounted on the rotating shaft, and the dedicated disk and the commercial disk are compatible by fixing the commercial disk using a nut even if the dedicated disk is not used. It becomes usable.

In addition, the coupler 10 may be further provided with a rotation guide means 260 to prevent any rotation between the fixed drum and the actuator and to check the fastening state of the disk.

Rotation guide means 260 is configured to include a steel ball 262 that operates to lock or release the locking groove 142 formed in the operation guide of the fixed drum, and an elastic material 264 for imparting an elastic restoring force to the steel ball Can be.

That is, as shown in FIGS. 7 to 11, elastic members 264 such as springs are fitted, and steel balls 262 are installed at the ends of the elastic members, while the actuator 200 rotates while the disk is fitted. When the rotation is made along the inner circumferential surface of the fixed drum, the locking groove 142 is formed to limit the rotation of the steel ball is formed

According to such a configuration, when the disk is rotated, the steel ball is pressed and rotated by the elastic force of the elastic material, and the steel ball held by the locking groove 142 enters the inside while the actuator 200 is idling from the fixed drum 100. This can prevent damage and protect it safely.

In addition, when rotating by a certain radius, the steel ball 262 is protruded by the elastic restoring force of the elastic material and is caught in the locking groove 142, and the user is engaged because the feeling is caught at the end when the user fastens the disk. You can check.

At this time, the operation guide 140 is formed to protrude on the outer periphery of the fixed drum, the locking groove 142 is formed to be embedded in the outer periphery of the operation guide, the rotation guide means 260 of the operation body 201 The accommodation space 266 is formed in the horizontal direction, so that the steel balls 262 and the elastic material 264 are inserted into the accommodation space to operate in the horizontal direction, thereby minimizing the mounting height of the rotation guide means 260.

Therefore, the thickness of the fixed drum and the actuator can be slimmed, and the thickness of the entire coupler can be slimmed despite the structure in which the rotation guide means 260 is integrated.

In this case, the guide means 260 may be formed at both ends of the rotation radius of the operation section setting unit 240 so as to check the state that the disk is fastened or prepared to separate, respectively.

On the other hand, the operating guide 140 of the fixed drum 100 is assembled to the actuator 200 in order to prevent the departure from the operating plate 202 of the actuator 200 along the circumference of the mounting hole 210 Protruding surface 212 and fastening groove 214 may be formed repeatedly.

By such a configuration, the operating guide 140 of the fixed drum 100 is first inserted into the fastening groove 214 so that the fixed drum is turned away from the operating plate, and the operating plate 202 is operated in the state. It can be assembled into a simple structure by fitting to the 201.

In addition, the actuator 200 is provided between the actuating body 201 and the actuating plate 202 so that the assembling structure of the fixed drum 100 and the actuator 200 can be made step by step and easily assembled. The guide plate 203 may be further provided.

The guide plate 203 is assembled before assembling the operation plate 202 on the top of the operation body 201, the operation guide of the fixed drum in the state in which the fixed drum 100 is assembled to the operation body 201 ( 140 is assembled to prevent the separation of the steel ball 262 and the elastic material 264, the assembly guide hole 230 may be formed in a shape in which the central portion is perforated to enable pre-assembly of the fixed drum.

At this time, the mounting plate 210 and the assembly guide hole 230 for assembling the fixed drum are formed in the operation plate 202 and the guide plate 203, respectively, the assembly guide hole 230 of the guide plate 203. Protruding

surfaces

212 and 232 and

fastening grooves

214 and 234 are repeatedly formed along the periphery, respectively, so that the operation guide 140 of the fixed drum 100 can be inserted and assembled.

And the protrusion surface and the fastening groove formed in the mounting hole 210 and the assembly guide hole 230 is a protrusion formed along the circumference of the assembly guide hole 230 when the operating plate 202 and the guide plate 203 are assembled. The surface 232 and the fastening groove 234 may be alternately formed to cross the protruding surface 212 and the fastening groove 214 along the circumference of the mounting hole 210.

That is, when the configuration of the outer casing constituting the actuator 200, as shown in Figure 4 consists of a double configuration of the operating body 201 and the operating plate 202, the fastening groove formed in the operating plate 202 ( The position of the 214 is positioned at the position intersected with the operation section setting unit 240 so that the operation guide 140 of the fixed drum is not separated by the protruding surface 212 in a state accommodated in the operation section setting unit 240. Rotational operation of the actuator is achieved.

On the other hand, when the configuration of the outer casing constituting the actuator 200 as shown in Figure 5 consists of a triple configuration of the operating body 201, the operating plate 202 and the guide plate 203, the guide plate ( The position of the fastening groove 234 formed in the 203 is positioned at a position intersected with the operation section setting unit 240 so that the projection guide 140 of the fixed drum is accommodated in the operation section setting section 240. The rotation of the actuator is made without being separated by 232).

Claims

A cylindrical fixed drum 100 fastened in a spiral manner to a rotating shaft of the hand grinder;

An actuator (200) rotatably assembled to the fixed drum (100) and mounted with a cutting or polishing disk to guide the rotation of the disk;

It consists of a mounting wheel 300 which is provided on the inner circumference of the disk for mounting the disk in the fixed drum and the actuator assembled state,

The fixed drum 100 includes a fixing part 120 for preventing the detachment in the state where the disk is mounted and an operation guide 140 for controlling the rotation of the actuator.

The actuator 200 has a mounting hole 210 formed at the center to insert the fixed drum, and a protrusion 220 for preventing idling of the disk in the assembled state of the disk and inducing coaxial rotation of the fixed drum and the actuator. And, the operation guide of the fixed drum is seated includes an operating section setting unit 240 for limiting the radius of rotation of the actuator,

The mounting wheel 300 includes an insertion protrusion 320 inserted between the fixing part 120 of the fixing drum and the protrusion 220 of the actuator.

The disc holding device of the hand grinder, characterized in that when the disc is inserted and rotated while the fixed drum and the actuator are assembled, the disc is fixed to the hand grinder while the actuator and the disc are rotated together.
According to claim 1, wherein the fixed drum 100 is fixed to the upper side of the fixed drum 120, the lower side of the fixed drum, the operation guide 140 is formed to be spaced apart so that the disk can be accommodated, the fixed portion ( 120 and the operation guide 140 is provided with a plurality of fixed parts and the operation guide at equal intervals along the outer circumference of the fixed drum,

The actuator 200 has an upper portion of the operating body 201 having an operating section setting unit 240 formed thereon, and closing the upper portion of the operating body and having a fixed drum in which the operating guide of the fixed drum is accommodated in the operating body. The disk holding device of the hand grinder, characterized in that the operating plate 202 is provided with a protrusion 220 for inducing coaxial rotation of the fixed drum and the actuator without being separated.
[3] The steel ball 262 of claim 2, wherein the steel ball 262 is operated to be caught or released by the locking groove 142 formed in the operation guide of the fixed drum to prevent any rotation between the fixed drum and the actuator and to check the fastening state of the disk. The disk holding device of the hand grinder, characterized in that the rotation guide means 260 including an elastic member 264 for imparting an elastic restoring force to the steel ball.
According to claim 3, The operation guide 140 is formed to protrude on the outer periphery of the fixed drum, the locking groove 142 is formed to be embedded in the outer periphery of the operation guide,

The rotation guide means 260 is a fixed drum and the receiving space 266 is formed in the horizontal direction of the operating body 201 to accommodate the steel ball 262 and the elastic material 264 in the receiving space to operate in a horizontal direction and Disk holder of a hand grinder, characterized in that the thickness of the actuator can be made slim.
[5] The hand grinder according to claim 3 or 4, wherein the guide means 260 is formed at both ends of the rotation radius of the operation section setting unit 240 so as to check the state in which the disk is fastened or prepared for separation. Disc retainer.
According to claim 4, Protruding surface 212 along the periphery of the mounting hole 210 in the actuator 200 to prevent separation in the operating guide 140 of the fixed drum assembled to the actuator 200 And a fastening groove 214 is repeatedly formed disc holding device of a hand grinder.
The method of claim 4, wherein the actuator 200 prevents the separation of the operation guide 140 and the steel ball 262 and the elastic member 264 of the fixed drum in the state in which the fixed drum is assembled on the upper end of the operating body 201. The disk fixing device of the hand grinder, characterized in that the guide plate 203 is further provided with an assembly guide hole 230 in order to.
According to claim 7, wherein the actuator 200 is projected surfaces 212,232 and the fastening grooves, respectively, along the periphery of the mounting hole 210 of the operating plate 202 and the assembly guide hole 230 of the guide plate 203. Repeatingly formed (214, 234), the disk fixing device of the hand grinder, characterized in that the protrusion formed in the mounting hole 210 and the assembly guide hole 230 and the staggered groove is crossed to each other.