KR102136486B1 - Fixing device for grinder wheel - Google Patents

Abstract

The present invention relates to a fixing apparatus for a grinder wheel, which is able to rapidly fix the grinder wheel by a spiral fastening method, to prevent a spiral line from being damaged even during a work on a workpiece, to make it easy to disassemble, to reduce the number of components to the minimum, to rapidly, conveniently fix and disassemble, to place the grinder wheel and a wheel fixing nut to be detachable to fix the wheel, and to be disassembled and separately collected when discarded. The fixing apparatus for the grinder wheel comprises: a motor shaft installed to be rotated by driving a motor, to have a bearing support unit formed on an outer circumferential edge to protrude in a ring shape, and to have a male screw formed on an outer end unit; a bearing wherein an internal side surface is settled on the bearing support unit to allow an inner wheel and an outer wheel to rotate respectively; the grinder wheel formed to cut or grind a workpiece, having a boss installation hole formed by penetrating in the center; and a wheel fixing nut which includes an outer body in full contact with an external surface of the grinder wheel, an inner body in full contact with an internal surface of the grinder wheel, a female screw formed to protrude from the center of the outer body inwards and to be spirally fastened with the male screw unit, and a lower surface penetrating the boss installation hole, which is placed as the boss settled on an upper surface of the bearing.

Description

Fixing device for grinder wheel

The present invention relates to a grinder wheel fixing device, and more specifically, by fastening the motor shaft rotating with the power of the motor and the wheel fixing nut with a spiral, so that the grinder wheel can be quickly and easily fixed and dismantled, and also the wheel fixing nut. The present invention relates to a grinder wheel fixing device that is detachably installed on a grinder wheel to facilitate replacement and separation.

In general, a grinder wheel is used to cut the workpiece to a design or to polish or grind the surface to obtain impurities and polish.

The grinder wheel is installed and used in a hand grinder made of a small motor so that an operator can carry it by hand, or is installed in a large motor with a relatively high output arranged in a work site, and is used to process long, thick workpieces.

Such a grinder wheel is configured such that, as in Patent Registration No. 10-136640, a nut composed of at least two on a motor shaft that rotates by driving a motor is engaged in a spiral with the motor shaft in contact with the upper and lower surfaces, respectively.

However, when the grinder wheel rotates, the force is applied in the direction in which the nuts that are fixed to the upper and lower sides are also tightened. As a result, the grinder wheel gradually moves in the inner direction of the motor shaft. As a result, the screw thread of the nut disposed on the upper surface is broken. There was a problem that could not be dismantled.

In addition, the conventional nut fixing method has a problem in that the process according to the fixing is increased because the operator has to separately install the nut to fix the grinder wheel.

In order to solve this problem, Patent Publication No. 10-2018-0137700 (Grinder Wheel Fixing Module and Grinder Wheel Fixing Method) has been disclosed as a prior art. Looking at the configuration, a first through hole extending along an axial direction in the center , A first protrusion protruding toward the center from the side surface of the first through hole and extending in a direction opposite to the first radial direction, protruding toward the center from the side surface of the first through hole and intersecting the first radial direction A second protruding portion extending along the opposite direction of the second radial direction, protruding toward the center from the side surface of the first through hole and intersecting with the first and second radial directions, respectively, in the opposite direction of the third radial direction A grinder wheel having a third projection extending along, and having a disc shape, and a fixing bolt for projecting from the grinder body and extending along the axial direction and transmitting rotational power generated by the grinder body to the grinder wheel, A first coupling member including a second through hole through which the fixing bolt passes and a seating groove provided adjacent to the second through hole, and supporting the grinder wheel, the first coupling member and the grinder body It is disposed between to transmit the elastic force to the first coupling member, the elastic member for receiving the fixing bolt therein and the nut body for screwing with the fixing bolt through the first through hole and the second through hole , The first wing extending in the first radial direction from the nut body, the second wing extending in the second radial direction from the nut body, the third wing extending in the third radial direction from the nut body, the A first wing groove extending along the opposite direction of the axial direction and provided on the first wing, a second wing groove extending along the opposite direction of the axial direction and provided on the second wing, and the axial direction of the It includes a second coupling member extending in the opposite direction and including a third wing groove provided in the third wing.

That is, after the fixing member having the first to third protrusions is installed in the center of the prior art grinder wheel, the elastic member is mounted on the fixing bolt, and after the first coupling member is installed in front of the grinder wheel, the fixing member of the grinder wheel is installed. When the second coupling member made of the shape and the corresponding shape is inserted into the fixing member and turned, each protrusion of the fixing member is hung in the groove portion of the second coupling member, where the grinder wheel and the first coupling member compress the elastic member It is configured to be closely fixed in one state.

However, in order to smoothly rotate and fix the second coupling member, the fixing member provided in the grinder wheel inevitably occurs. This clearance has a problem in that the grinder wheel is shaken during the machining of a workpiece, so that accurate cutting is impossible, and the cut surface is irregularly uneven, thereby performing a polishing operation.

In addition, as the elastic member installed at the rear and providing elastic adhesive force is stretched with frictional resistance, it is unable to grasp the shaking of the play, so that the problem of the play cannot be solved.

Particularly, the first and second coupling members and fixing members provided for fixing the grinder wheel solved the problem that the conventional nut was damaged and could not be disassembled, but the number of processes for fixing increased and the production cost increased due to the increase in components. There was a problem.

Furthermore, since the grinder wheel and the fixing member are integrally formed, the grinder wheel, which has reached the end of its life, is not disassembled, and thus there is a problem that separation due to industrial waste treatment is impossible.

The present invention has been devised to solve the above problems, and the grinder wheel is quickly fixed by a spiral fastening method, but it is easy to disassemble because screws are not broken even in the work piece, and the components are minimized to quickly and easily fix them. And dismantling, and further, a grinder wheel and a wheel fixing nut for fixing the wheel are detachably configured to disassemble and dispose upon disposal to provide a grinder wheel fixing device capable of separate collection.

The present invention is configured as follows to achieve the above object. That is, it is installed to be rotated by the driving of the motor, a bearing support portion protruding in the shape of a ring is formed on the outer periphery, a motor shaft formed with a male screw at an outer end, and an inner surface is seated on the bearing support portion, so that the inner and outer rings rotate respectively. A bearing to be formed, a grinder wheel formed to cut or polish a work piece, a boss installation hole penetrated in the center, an outer body in close contact with the outer surface of the grinder wheel, an inner surface in close contact with the inner surface of the grinder wheel, and the center of the outer body It characterized in that it is formed of a wheel fixing nut provided as a boss that is protruded in the inner direction but is screwed into the male screw portion therein, and the lower surface passing through the boss installation hole is seated on the upper surface of the bearing.

In addition, the grinder wheel fixing device, characterized in that the outer body and the inner body are integrally formed with a boss in a state in which a grinder wheel is interposed between them.

In addition, the boss mounting hole is formed into a square having an edge, and the outer shape of the boss passing through the boss mounting hole is formed into a square corresponding to the boss mounting hole, so that the wheel fixing nut and the grinder wheel are rotated without slipping. Features a grinder wheel fixing device.

Alternatively, the outer body and the inner body constituting the wheel fixing nut are divided and formed to be detachable, respectively, and the boss 430 formed on the outer body 410 is positioned outside the boss formed on the outer body. The plurality of elastic fixing pieces 411 and protruding jaws 412 having self-elasticity in the inner surface position, and the mounting hole formed in a position where the elastic fixing piece penetrates out of the boss installation hole of the grinder wheel and the boss in the inner body A boss receiving hole through which a boss passing through the installation hole passes is formed, and a flat fixing hole is formed to insert an elastic fixing piece through the installation hole, and the flat fixing hole has a protruding jaw protruding from the elastic fixing piece. It is characterized by consisting of a locking jaw formed to be hung.

Alternatively, the inner and outer surfaces of the boss 430 formed in the outer body 410 are formed to be detachably formed by dividing the outer body and the inner body constituting the wheel fixing nut, respectively. A plurality of elastic fixing pieces 411 and protruding jaws 412 having a self-elasticity in position, and an installation hole formed in a position where the elastic fixing piece penetrates out of the boss installation hole of the grinder wheel and the boss installation hole in the inner body A boss receiving hole through which a boss passing through is formed, and protruding so as not to deviate from the installation hole at a position corresponding to the elastic fixing piece, and a fixed piece formed to insert an elastic fixing piece through the installation hole therein. A hole is formed, and the flat fixing hole is characterized in that it consists of a protruding insert formed with a locking jaw so that the protruding jaw protruding from the elastic fixing piece is hung.

In addition, on the one surface corresponding to the direction in which the grinder wheel rotates in the protruding insertion portion, the elastic portion is configured to be in contact with the inner surface of the installation hole in a state in which the inside is formed to have a self-elastic force.

On the other hand, the outer body and the inner body is characterized in that a plurality of through-holes are formed so that the friction heat generated by the grinder wheel is quickly dissipated to the outside during work.

According to the present invention as described above, by fastening the female screw formed on the wheel fixing nut and the male screw formed on the motor shaft with a spiral, there is an effect that can be quickly and easily fixed and dismantled. That is, there is an effect that the grinder wheel is fixed in the direction in which the motor shaft rotates, and can be dismantled along the spiral when rotating in the reverse direction.

In addition, when the lower surface of the boss constituting the wheel fixing nut and the upper surface of the bearing come into contact, when the grinder wheel for processing the workpiece rotates and tries to move along the helix to the motor shaft, the lower surface is caught by the bearing and prevents it from moving forward. By doing so, it is possible to prevent the breakage of the helix, which is a problem of the conventional nut method, so that the reverse rotation of the wheel fixing nut for dismantling is possible.

In addition, the bearing is seated on the bearing support, and the inner ring and the outer ring rotate freely, so that when the fastening nut rotates in the reverse direction for disassembly, it can be rotated smoothly without any obstacle or interference, thereby enabling rapid disassembly. .

On the other hand, by forming the outer body and the inner body integrally with the grinder wheel, a solid fixing force can be exhibited, and furthermore, the boss installation hole of the grinder wheel and the outer periphery of the boss are formed in a square shape to prevent slip phenomenon during cutting or polishing. It has an effect of preventing the cutting or abrasive power from deteriorating.

In addition, by constructing the outer body and the inner body detachably, the grinder wheel having reached the end of its life can be divided into industrial wastes and recycled products to be separated and disposed of.

In addition, when working with the protruding insert inserted into the installation hole, the vulnerable corner portion of the installation hole is easily damaged due to frictional resistance during operation. By forming an elastic part having self-elasticity at one end of the protruding insert, this problem causes elastic friction resistance. It has the effect of protecting the vulnerable corners of the installation holes by absorbing additional.

In addition, by forming heat dissipation holes in the outer body and the inner body, the heat of the portion of the wheel fixing nut among the grinder wheels is quickly dissipated to the outside during work, thereby preventing the grinder wheel from being damaged by thermal deformation. It is.

1 is a cross-sectional view showing a state in which the grinder wheel according to the present invention is fixed to the motor shaft using a bearing and a wheel fixing nut.
Figure 2 is an exploded perspective view of Figure 1
Figure 3 is a cross-sectional view showing a state in which the bottom surface of the boss according to the present invention is seated only on the outer ring constituting the bearing
Figure 4 is an exploded perspective view showing a state in which the boss mounting hole according to the present invention is formed in a square;
Figure 5 is an exploded perspective view showing a state in which the grinder wheel is fixed using a wheel fixing nut configured as a removable type according to the present invention
6 is a cross-sectional view showing a state in which FIG. 5 is fixed.
7 is a cross-sectional view showing a state in which the protruding jaw is engaged and disengaged from the engaging jaw in FIG.
Figure 8 is an exploded perspective view showing a protruding insert according to the present invention
9 is a cross-sectional view showing a state in which FIG. 8 is fixed.
Figure 10 is an exploded perspective view showing a state in which the elastic portion is formed in the protruding insert according to the present invention
11 is a plan view showing a state in which the elastic part according to the present invention absorbs shock by frictional resistance generated by rotation of the grinder wheel.
12 is an exploded perspective view showing a state in which heat radiation holes are formed on inner and outer bodies according to the present invention, respectively.
13 is a cross-sectional view showing a state in which friction heat is dissipated to the outside when machining a workpiece in a state in which FIG. 12 is fixed.

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

The present invention is large, as shown in the accompanying drawings, the motor shaft 100, the bearing 200 inserted into the motor shaft 100, the grinder wheel 300 for processing a workpiece and the grinder wheel ( It consists of a wheel fixing nut 400 for fixing the 300) to the motor shaft 100.

1 and 2, the motor shaft 100 is installed and rotates on a motor that generates a rotational force by supply of power. 110 is formed, the outer end of the outer periphery is formed with a male screw 120 having a constant pitch and height in the inner direction, the wheel fixing nut 400 to be described later is configured to be fastened and fixed.

The bearing 200 is seated on the bearing support 110 protruding from the outer periphery of the motor shaft 100, and a ball or roller is interposed between the inner ring and the outer ring, so that the inner ring and outer ring rotate freely regardless of the rotation direction. It is configured as possible.

The motor shaft 100 is inserted into the inner ring configured as described above, and the lower surface of the boss 430, which will be described later, is seated on the upper surface of the outer ring, so that the high-strength bearing 200 moves the boss 430 to advance along the spiral. By preventing, the spiral prevents damage, and thus has a function of rotating without interference due to obstacles when dismantling in reverse rotation.

The grinder wheel 300 is used to cut a suitable length of a work piece according to the type and shape of the surface particles or to smoothly polish an uneven surface, and the boss 430, which will be described later, is installed through the center. Holes 310 are formed.

The wheel fixing nut 400 is configured to quickly and easily fix and disassemble the grinder wheel 300 by helical fastening with the motor shaft 100, and the outer body 410 contacting the outer surface of the grinder wheel 300 ) And the inner body 420 in contact with the inner surface of the grinder wheel 300.

In addition, the outer body 410 is formed in the downward direction, that is, the inner side of the bearing 200 is installed, the boss 430 is formed inside the hollow, the inside of the hollow of the boss 430 is the motor shaft The female screw 431 is formed to be engaged with the male screw 120 formed on the (100).

In addition, between the outer body 410 and the inner body 420 is spaced by the thickness of the grinder wheel 300, a part of the boss 430 disposed in the spaced apart portion is installed in the boss formed in the grinder wheel 300 It is fixed through the hole 310.

When the female screw 431 formed on the wheel fixing nut 400 configured as described above is fastened with the male screw 120 formed on the motor shaft 100, the lower surface of the lowered boss 430 is seated on the upper surface of the bearing 200 and at the same time a grinder. The wheel 300 is fixed to the motor shaft 100.

In addition, the rotational direction of the fastening nut 400 is tightened and the rotational direction of the motor shaft 100 is the same, so that the spirally coupled wheel fixing nut 400 is reversed by the transmitted rotational force and is not arbitrarily disassembled. do.

Therefore, when the motor shaft 100 rotates, the wheel fixing nut 400 also rotates in the forward direction to be tightened, so that a moving force is applied in the inner direction in which the bearing 200 is disposed, but the upper surface of the bearing 200 has high strength. When the boss 430 is in contact with the bottom, it is no longer possible to advance, and restraining the advance prevents the female screw 431 formed inside the boss 430 from being damaged, and reverses the grinder wheel 300 for dismantling. Rotating with the inner ring and the outer ring rotate freely, respectively, and can move without interference in the upward direction along the spiral of the motor shaft 100.

Here, when the entire lower surface of the boss 430 is seated on the upper portion of the bearing 200, interference may occur in reverse rotation for dismantling. That is, the inner ring constituting the bearing 200 is rotated or stopped in the same manner according to the rotation of the motor shaft 100, and the outer ring is not rotated at the same time in non-contact with the motor shaft 100.

Accordingly, as shown in FIG. 3 of the accompanying drawings, the bottom surface of the boss 430 is configured to be formed to have a width contacting only the top surface of the outer ring, and when the boss 430 is reversely rotated for disassembly, the motor shaft 100 and the inner ring In this stopped state, the outer ring is rotated separately, and as a result, the wheel fixing nut 400 is released from the motor shaft 100 and has a working effect.

Further, the outer body 410 and the inner body 420 constituting the wheel fixing nut 400 put the grinder wheel 300 on a mold and inject a resin solution to grinder wheel 300 and the wheel fixing nut 400 ) Can be integrally formed.

In addition, the boss installation hole 310 of the grinder wheel 300 is formed of a square 311 having corners, as shown in FIG. 4 of the accompanying drawings, and thus, a boss 320 formed of the injected resin solution is also supported. It is formed in a square shape and the corners thereof are in contact with each other, so that when the motor shaft 100 rotates, the rotational force can be transmitted without slipping.

Meanwhile, the wheel fixing nut 400 may be detachably configured so that the grinder wheel 300 is disassembled.

To this end, as shown in FIGS. 5 and 7 of the attached drawings, the outer body 410 and the inner body 420 are respectively formed, and the center of the outer body 410 protrudes in the inner direction and female threads therein ( 431) is formed a boss 430 is formed, a plurality of elastic fixing pieces 411 having a self-elasticity in the radial direction away from the boss 430 is formed, a protruding jaw on the outer end of the elastic fixing piece 411 412 is formed.

In addition, a boss installation hole 310 through which a boss 430 penetrates is formed in the center of the grinder wheel 300, and an elastic fixing piece 411 is positioned at a position of the grinder wheel 300 corresponding to the elastic fixing piece 411. ), the installation hole 320 is formed to penetrate.

In addition, a boss receiving hole 421 is formed in the inner body 420 so that a boss 430 passing through the boss installation hole 310 is accommodated therein, and an elastic fixing piece passing through the installation hole 320 is provided. A flat fixing hole 422 is formed so that the 411 is inserted and fixed, and a locking jaw 423 is formed at the inner end of the flat fixing hole 422 so that the protruding jaw 412 is hung.

Therefore, the elastic fixing piece 411 and the protruding jaw 412 formed in the outer body 410 penetrate the installation hole 320 formed in the grinder wheel 300, and in succession, the flat fixing hole 422 formed in the inner body ), the protruding jaw 412 is fixed to the locking jaw 423 so that the wheel fixing nut 400 and the grinder wheel 300 can be integrated, and the grinder wheel 300 having reached the end of its useful life is discarded. In this case, it has the effect of being easily disassembled by pushing or pushing the protruding jaw 412 with a tool and disengaging from the engaging jaw 423,

In addition, when the elastic fixing piece 411 penetrates through the installation hole 320 and is fixed to the flat fixing hole 422, the elastic fixing piece 411 rotates the grinder wheel 300 when the fixed nut 400 rotates. It also has the effect of pushing the rotating force without slipping.

Alternatively, the elastic fixing piece 411 may be damaged due to frictional resistance while rotating at a high speed when processing a work piece, because there are limitations in that its thickness must be relatively thin in order to have its own elastic force.

Accordingly, as shown in FIGS. 8 and 9 of the attached drawings, a protrusion inserting portion 424 protruding outwardly is formed while a thickness is provided to the flat fixing hole 422, but the protrusion inserting portion 424 is formed. The protruding height and width are formed to match the thickness and width of the installation hole 320 so that the protrusion insertion portion 424 inserted into the installation hole 320 is not exposed to the outside.

The protruding insertion portion 424 configured as described above is formed into a thickness that is not damaged by a load, and is inserted directly into the installation hole 320, thereby preventing the elastic fixing piece 411 and the installation hole 320 from being non-contacted and damaged. It is.

Furthermore, one surface in contact with the protruding insertion portion 424 and the installation hole 320 may be damaged due to high-speed rotation and frictional resistance of the motor shaft 100. That is, when the grinder wheel 300 rotates in the clockwise direction, frictional resistance is generated in the opposite direction, so that one surface where the protruding insertion portion 424 and the installation hole 320 come into contact, in particular, is vulnerable to a corner portion and may be damaged by a load. Can.

Accordingly, as shown in FIGS. 10 and 11 of the accompanying drawings, an elastic portion 425 formed to have a self-elastic force may be further configured on a rotating surface of the protruding insertion portion 424.

The elastic portion 425 is formed as a hollow inside, and having a self-elasticity by forming a relatively thin thickness, the elastic portion 425 is in contact with the inner surface of the installation hole 320.

The elastic portion 425 configured as described above, when the frictional resistance force is transmitted to the installation hole 320 and attempts to retreat, the elastic portion 425 is retracted by the elastic force to absorb the shock, and is also installed with the protruding insertion portion 424 Since each of the most vulnerable corner portions in the hole 320 is not in contact with each other, there is an action effect that can eliminate the possibility of damage.

Furthermore, as shown in FIGS. 12 and 13 of the accompanying drawings, a plurality of heat dissipation holes 440 are formed in the outer body 410 and the inner body 420.

That is, if the friction heat generated in the central portion of the grinder wheel 300, which is obscured by the outer body 410 and the inner body 420, is confined therein during machining of the workpiece, the grinder wheel 300 is thermally deformed by friction heat. To solve the problem, by forming heat dissipation holes 430 in the outer body 410 and the inner body 420, friction heat generated by friction quickly dissipates to the outside through the heat dissipation hole 430 to prevent thermal deformation. You can do it.

Here, the heat dissipation hole 440 may be formed by a plurality of circularly spaced at regular intervals, or may be formed by a long hole having a curved shape.

The heat dissipation hole 440 formed of the curved long hole is preferable for rapid heat dissipation because the fan fixing fan 400 rotates to obtain an air blowing effect from the inside to the outside, such as a fan of the fan.

The present invention configured as described above is configured by a wheel fixing nut 400 integrally or detachably with the grinder wheel 300, and fixed with a spiral, which is the most convenient method for fixing the motor shaft 100, but has a durable bearing 200 ) To prevent damage to the boss 430 and the female screw 431 constituting the wheel fixing nut 400, and the boss 430 rotating freely when the bearing 200 rotates in the reverse direction without any obstacle or interference. The wheel grinder 400, which has an effect of enabling rapid disassembly by rotation, and is detachable, is a useful wheel grinder wheel fixing device capable of separating and recycling recycled products and industrial waste, respectively, when disposing of the grinder wheel 300 that has reached the end of its useful life. It can provide.

The present invention is not limited to the above-described embodiment, and can be implemented by variously changing within the range permitted by the technical idea of the present invention.

Motor shaft: 100 Bearing support: 110
Male thread: 120 Bearing: 200
Grinder wheel: 300 Boss mounting hole: 310
Square: 311 Mounting hole: 320
Wheel fixing nut: 400 External body: 410
Elastic fixing piece: 411 Protruding jaw: 412
Inside body: 420 Boss accommodation hole: 421
Flat fixing hole: 422 Clamping jaw: 423
Protrusion insert: 424 Elastic: 425
Boss: 430 Female: 431
Heat dissipation hole: 440

Claims (8)

A motor shaft 100 installed to be rotated by driving of a motor, a bearing support 110 protruding in a ring shape on an outer periphery, and a male screw 120 formed at an outer end;
In order to easily detach the grinder wheel 300, the inner surface and the inner bearing and the outer ring are mounted on the bearing support 110, the bearing 200 rotates, respectively;
A grinder wheel 300 formed to cut or polish a work piece and having a boss installation hole 310 through the center;
The outer body 410 and the inner body 420 that make the inner and outer surfaces of the grinder wheel 300 closely contact each other, the outer body 410 and the inner body 420, and a boss seated on the upper surface of the bearing 200 Wheel fixing nut 400 including a female screw formed in 430, a male screw formed on the motor shaft; is composed of,
When the wheel fixing nut 400 is rotated in the rotation direction of the grinder wheel 300, it is fixed to the motor shaft 100, and when rotated in the reverse direction, the wheel fixing nut 400 is disassembled from the motor shaft 100 together with the grinder wheel 300. Grinder wheel fixing device.
According to claim 1,
The outer body 410 and the inner body 420 is a grinder wheel fixing device, characterized in that integrally formed with the boss 430 in a state interposed between the grinder wheel (300).
delete According to claim 1,
The outer body 410 and the inner body 420 constituting the wheel fixing nut 400 are separately formed to be detachably formed.
A plurality of elastic fixing pieces 411 and the protruding jaw 412 having a self-elastic force at the position of the inner surface outside the boss 430 formed on the outer body 410,
Out of the boss installation hole 310 of the grinder wheel 300 and the installation hole 320 formed in a position through which the elastic fixing piece 411 penetrates,
The inner body 420 is formed with a boss receiving hole 421 through which a boss 430 passing through the boss installation hole 310 passes, and an elastic fixing piece 411 passing through the installation hole 320 is inserted. The flat fixing hole 422 is formed to be formed, and the flat fixing hole 422 is formed of a locking jaw 423 formed so that the protruding jaw 412 protruding from the elastic fixing piece 411 is hooked,
The outer body 410 and the inner body 420 are fixed or removed using an elastic fixing piece 411 and a knitting fixing hole 422, while the elastic fixing piece 411 is accommodated in the installation hole 320 Grinding wheel 400 and the grinder wheel 300 is a grinder wheel fixing device characterized in that the rotation without slip phenomenon.
According to claim 1,
The outer body 410 and the inner body 420 constituting the wheel fixing nut 400 are separately formed to be detachably formed.
A plurality of elastic fixing pieces 411 and protruding jaws 412 having self-elasticity at positions outside the boss 430 formed on the outer body 410,
Out of the boss installation hole 310 of the grinder wheel 300 and the installation hole 320 formed in a position through which the elastic fixing piece 411 penetrates,
The inner body 420 is formed with a boss receiving hole 421 through which the boss 430 passing through the boss mounting hole 310 passes, and the installation hole (at a position corresponding to the elastic fixing piece 411) 320) is formed so as to be inserted so as not to deviate, and the elastic fixing piece 411 penetrating through the installation hole 320 is formed therein, and the flat fixing hole 422 is formed with elasticity. Consists of a projection insert 424 formed with a locking jaw 423 so that the protruding protrusion 412 protruding from the fixing piece 411 is caught,
While the outer body 410 and the inner body 420 are fixed or removed using the elastic fixing piece 411 and the knitting fixing hole 422, the protruding insert 424 is accommodated in the installation hole 320 Grinding wheel 400 and the grinder wheel 300 is a grinder wheel fixing device characterized in that the rotation without slip phenomenon.
The method of claim 5,
On the one surface corresponding to the direction in which the grinder wheel 300 rotates in the protruding insertion portion 424, an elastic portion 425 contacting the inner surface of the installation hole 320 in a state in which the inside is formed to have a self-elastic force is formed. It consists of,
When the grinder wheel 300 rotates, the inner surface of the installation hole 320 that retracts from the frictional resistance of the workpiece absorbs the impact while pressing the elastic portion 425 so that the corner portion of the installation hole 320 absorbs the frictional resistance. Grinding wheel fixing device, characterized in that to prevent damage to.
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