KR20230012733A - Grinder wheel holder for hand grinder - Google Patents

Abstract

The present invention relates to a grinder blade holder used to simply attach a grinder blade, such as cutting stone, grinding stone, and a brush to a hand grinder and detach the grinder blade from the hand grinder. The grinder blade holder has a new form comprising: an inner holder and an outer holder connected to the inner side and the outer side across a bearing; and multiple cushion rings accommodating a coupling force and absorbing vibration by being interposed between the inner and outer holders. The grinder blade holder can improve workability related to replacement of the grinder blade by tightly tightening a nut and simultaneously easily loosening the nut by accommodating a part of the coupling force of the nut for fixing the grinder blade. Specifically, the grinder blade holder for a hand grinder enables a worker to do the work comfortably and safely by absorbing the entire quantity of vibration and shaking generated when the grinder blade operates.

Description

Grinder blade holder of hand grinder {GRINDER WHEEL HOLDER FOR HAND GRINDER}

The present invention relates to a grinder blade fixing device for a hand grinder, and more particularly, to a grinder blade fixing device used to conveniently attach and remove grinder blades such as cutting stones, polishing stones, brushes, etc. to and from a hand grinder side.

In general, the hand grinder used for industrial machinery, shipbuilding, and other various instruments smooths the rough surface of the firstly processed part or the part to be painted, or the first It is used for purposes such as partially cutting and cutting raw materials.

For example, a hand grinder operates a grinder shaft at high speed by receiving power from an electric motor or compressor, and also cuts objects made of stone or metal by a cutting or abrasive disc mounted on the grinder shaft. It is used for finishing work by polishing the surface of the machine, polishing, grinding off unprocessed parts, edges, etc., or cutting and cutting.

Usually, the grinder blade of the hand grinder is used by attaching it to the grinder shaft by inserting it into the grinder shaft and fixing it using a nut, or by fastening a bolt to the grinder shaft to fix it.

Such a grinder blade has a short life cycle and must be frequently replaced during cutting or polishing operations.

However, in order to replace the grinder blade, it takes a lot of time to replace the grinder blade, such as loosening and tightening a tightly tightened nut, and it is difficult to loosen the tightened nut as well as requiring a lot of strength. There is a disadvantage that the polishing or cutting work is delayed.

In particular, when using a hand grinder, the operator holds the hand grinder with his or her hand while working, and the significant vibration or trembling generated by the hand grinder is continuously transmitted to the operator's hands and arms, causing a lot of inconvenience. In the case of workers who have to work using the hand, the number of cases of occupational diseases such as trembling hands or feeling pain is increasing.

Registered Patent Publication No. 10-2136486 Registered Patent Publication No. 10-0985466 Registered Patent Publication No. 10-1855860 Registered Patent Publication No. 10-1737890 Registered Patent Publication No. 10-2045341

Therefore, the present invention has been devised in view of this point, and an inner holder and an outer holder coupled inward and outward with a bearing interposed therebetween, and a plurality of cushion rings interposed between the inner and outer holders to absorb vibration as well as accommodate fastening force, etc. By implementing a new type of grinder blade fixing device that combines, it is possible to improve the workability related to grinder blade replacement by accepting some of the nut clamping force for fixing the grinder blade so that the nut can be firmly tightened and at the same time easily loosened. In particular, the purpose is to provide a grinder blade fixing device for a hand grinder so that workers can work comfortably and safely by absorbing all vibrations or vibrations generated during the operation of the grinder blade.

In order to achieve the above object, the grinder blade fixing device of the hand grinder provided by the present invention has the following characteristics.

The grinder blade fixing device of the hand grinder includes a circular inner holder having a hole through which the drive shaft of the hand grinder passes through in the center and an inner rubber cushion ring mounting groove formed on the upper edge, and contacting the grinder blade using the upper surface A hole through which the drive shaft of the hand grinder passes is formed in the center, and a circular outer holder coupled to the outside of the inner holder in a coaxial structure, and installed in a space formed inside between the inner holder and the outer holder, It is characterized in that it includes a bearing enabling rotation between the holders and an internal rubber cushion ring that exerts an elastic force in the vertical direction while being installed in the inner rubber cushion ring mounting groove of the inner holder.

The grinder blade fixing device of the hand grinder may further include an upper plate rubber cushion ring installed along the edge of the upper surface of the outer holder and exerting elasticity in the vertical direction while directly contacting the bottom surface of the grinder blade.

At this time, embossing may be formed on the upper surface of the rubber cushion ring of the upper plate in a form in which concave portions and convex portions are repeated in a circumferential direction.

Here, a circular outer holder protrusion relatively protruding from the upper surface is formed at the center of the upper surface of the outer holder, and the concave portion of the grinder blade is inserted into and coupled to the outer holder protrusion, thereby binding the grinder blade and the outer holder. The relationship can be strengthened and at the same time the grinder blade can be installed exactly in the correct position when mounting the grinder blade.

In addition, a rubber ring mounting groove may be formed on an inner circumferential surface of the inner holder, and a rubber ring for catching the radial flow of the hand grinder driving shaft may be mounted in the rubber ring mounting groove.

The grinder blade fixing device of the hand grinder provided by the present invention has the following effects.

First, when tightening and releasing the nut for mounting and dismounting of the grinder blade, the cushion ring made of rubber partially accommodates the tightening force of the nut, so that the close fastening state of the nut can be secured, and the cushion ring made of rubber even when the nut is released. Since the nut can be easily loosened as the elastic force exerted by it acts, the grinder blade is fixed more firmly and the separation of the grinder blade is fundamentally blocked, thus protecting the safety of the operator and making the replacement of the grinder blade effortless. It has the effect of being able to do it quickly and easily without having to do it.

Second, by absorbing the vibration, shock, and vibration that occur during the operation of the grinder blade, the cushion ring made of rubber can reduce the vibration or vibration that is transmitted to the operator, allowing the operator to work comfortably while at the same time providing precision machining. Of course, it has the effect of securing excellent processing quality.

Third, by applying an embossing structure or a concavo-convex structure to the rubber cushion ring of the upper plate that is in direct contact with the grinder blade, it is possible to maintain the binding state of the grinder blade closely and stably. There are possible effects.

1 and 2 are perspective views showing a grinder blade fixing device of a hand grinder according to an embodiment of the present invention
Figure 3 is a cross-sectional view showing a grinder blade fixing device of a hand grinder according to an embodiment of the present invention
4 and 5 are a perspective view and a cross-sectional view showing a state in which a grinder blade is fixed to a hand grinder using the grinder blade fixing device of the hand grinder according to an embodiment of the present invention.

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

1 and 2 are perspective views showing a grinder blade fixing device for a hand grinder according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a grinder blade fixing device for a hand grinder according to an embodiment of the present invention.

As shown in FIGS. 1 to 3, the grinder blade fixing device includes a circular inner holder 12 and an outer holder 13 made of a metal material and assembled inside and outside with a bearing 15 interposed therebetween. do.

The inner holder 12 has a circular block shape in which a hole 10a inserted into the grinder drive shaft (reference numeral 120 in FIG. 3) of the hand grinder (reference numeral 100 in FIG. 3) is formed through the center at the center. It is fitted into and coupled to the grind driving shaft 120 of the hand grinder 100 in a coaxial structure using the hole 10a.

An inner rubber cushion ring mounting groove 11 is formed on the edge of the upper surface of the inner holder 12, that is, on the edge of the upper surface positioned downward from the upper surface having a stepped structure, and the inner rubber cushion ring mounting groove 11 formed in this way The inner rubber cushion ring 16 can be mounted.

In addition, an inner holder protrusion 24 is formed at the center of the upper surface of the inner holder 12, that is, at the center of the upper surface positioned upward from the upper surface having a stepped structure. ) is molded into the concave portion on the bottom side of the outer holder protrusion 19 formed on the outer holder, and accordingly, when the inner holder 12 and the outer holder 13 are coupled, the inner and outer holders 12 and 13 are coaxial and accurately can be combined.

As a preferred embodiment, a rubber ring mounting groove 21 is formed on the inner circumferential surface of the inner holder 12, that is, on the inner circumferential surface of the hole 10a in the inner holder 12, and the rubber ring mounting groove 21 thus formed The rubber ring 22 can be mounted.

Accordingly, when the inner holder 12 is inserted into the grinder drive shaft 120 through the hole 10a, the rubber ring 22 at this time is slightly pressed and adheres to the outer circumferential surface of the grinder drive shaft 120, eventually rubber The radial flow of the grinder drive shaft 120 can be controlled by using the elasticity exerted by the ring 22, and noise generated when the grinder drive shaft 120 rotates can also be reduced.

The outer holder 13 is a part in contact with the grinder blade (reference numeral 110 in FIG. 3) using the upper surface, and a hole 10b fitted into the grinder drive shaft 120 of the hand grinder 100 is formed in the center, It is made in the form of a circular case, and is fitted into and coupled to the grind drive shaft 120 of the hand grinder 100 in a coaxial structure using the hole 1b at this time.

The outer holder 13 is coupled to the outside of the inner holder 12 in a coaxial structure, and the outer holder 13 and the inner holder 12 coupled in this way are connected to the inner circumferential lower end of the outer holder 13 and the inner holder 12. The coupled state at this time can be maintained by the snap ring 23 interposed between the bottom edge of the.

Here, when the outer holder 13 and the inner holder 12 are coupled, a predetermined space portion 14 forming a circular ring trajectory is formed between them, and a bearing ( 15) can be installed.

In addition, a circular outer holder protrusion 19 including a hole 10b is formed at the center of the upper surface of the outer holder 13 while relatively protruding from the upper surface, and the outer holder protrusion 19 thus formed It is fitted into the groove 20 formed around the bottom of the center hole of the grinder blade 110.

That is, when the grinder blade 110 is placed on the upper surface of the outer holder 13, the outer holder protrusion 19 of the outer holder 13 at this time is the concave portion 20 of the grinder blade 110. It can be inserted snugly into the inside.

As the outer holder 13 and the grinder blade 110 are coupled using the matching structure between the outer holder protrusion 19 and the groove portion 20, the binding relationship between the grinder blade 110 and the outer holder 13 is improved. Also, when the grinder blade 110 is mounted, the grinder blade 110 is accurately mounted in a position coaxial with the grinder drive shaft 120 and the outer holder 13, and the vibration of the grinder blade 110 and the like The same relief phenomenon can be minimized.

In addition, the grinder blade fixing device includes a bearing 15 as a means for enabling rotation between the inner holder 12 and the outer holder 13.

The bearing 15 is a thrust bearing, and is installed in the space 14 formed inside between the inner holder 12 and the outer holder 13, and is installed on the inner holder 12 side and the outer holder 13 side, respectively. come across

Accordingly, the inner holder 12 and the outer holder 13 can be rotated with each other through the bearing 15 as a medium, and eventually the rotational operation of the grinder blade 110 as well as the outer holder coupled therewith The rotation operation of (13) can be made smoothly.

In addition, the grinder blade fixing device includes an internal rubber cushion ring 16 as a means for accommodating clamping force when the nut is fastened and absorbing vibration when the grinder blade rotates.

The inner rubber cushion ring 16 is installed in the inner rubber cushion ring mounting groove 11 formed in the inner holder 12, and the inner rubber cushion ring 16 installed in this way is mounted on the bearing 15 ) and the outer holder 13 are elastically supported.

Accordingly, the inner rubber cushion ring 16 can exert an elastic force in the vertical direction while being slightly pressed by the outer holder 13 and the bearing 15 that are pressed down when the nut is fastened, and eventually this inner rubber cushion ring The entire grinder blade 110, including the inner and outer holders 12, can be tightly bound while part of the clamping force when the nut is fastened is accommodated by the elastic force exerted by (16), while the inner rubber cushion is released even when the nut is released. The nut can also be easily loosened by the elastic force exerted by the ring 16, that is, the restoring force.

In addition, the inner rubber cushion ring 16 serves to absorb vibration, shaking, shock, etc. generated during grinder work, and eventually reduces shaking transmitted to the operator's hands and arms, so that the operator is in a more comfortable state You can do grinder work with .

In addition, the grinder blade fixing device includes an upper plate rubber cushion ring 17 as a means for accommodating clamping force when the nut is fastened, absorbing vibration when the grinder blade rotates, and strengthening adhesion between the grinder blade and the outer holder.

The upper plate rubber cushion ring 17 has a disc-shaped ring shape and is installed along the edge of the upper surface of the outer holder 13, for example, along the circumference of the outer holder protrusion 19, and the upper plate rubber cushion is installed in this way. The ring 17 is able to exert an elastic force in the vertical direction while directly contacting the bottom surface of the grinder blade 110.

In addition, embossing 18 is formed on the upper surface of the top plate rubber cushion ring 17 in a form in which concave parts and convex parts are repeated along the circumferential direction, and the embossing 18 at this time uses a curved concave-convex surface to form a top plate It serves to double the cushion function of the rubber cushion ring 17.

Accordingly, the top plate rubber cushion ring 17 is slightly pressed by the grinder blade 110 pressed down when the nut is fastened to exert an elastic force in the vertical direction, and eventually the top plate rubber cushion ring 17 exerts The entire grinder blade 110 including the inner and outer holders 12 can be tightly bound while part of the clamping force when the nut is fastened is accommodated by the elastic force of the nut, while the rubber cushion ring 17 of the upper plate is The nut can also be easily loosened by the elastic force exerted, that is, the restoring force.

In addition, the upper plate rubber cushion ring 17 serves to absorb vibration, shaking, shock, etc. generated during grinder work, and eventually reduces shaking transmitted to the operator's hands and arms, so that the operator is in a more comfortable state You can do grinder work with .

4 and 5 are a perspective view and a cross-sectional view showing a state in which a grinder blade is fixed to a hand grinder using the grinder blade fixing device of the hand grinder according to an embodiment of the present invention.

4 and 5, here shows a process of assembling the grinder blade fixing device 140 and the grinder blade 110 to the grinder drive shaft 120 of the hand grinder 100.

First, the grinder blade fixing device 140 is fitted to the grinder driving shaft 120 of the hand grinder 100, and the grinder blade 110 is fitted thereon.

Next, when the nut 130 is fastened to the threaded portion of the grinder drive shaft 120 and tightly tightened, the grinder blade 110 is the upper surface of the outer holder 13 of the grinder blade fixing device 140, that is, the outer holder 13 ) is in close contact with the upper plate rubber cushion ring 17 on the upper surface.

When the nut 130 is completely fastened in this way, the grinder blade 110 is fixed to the grinder drive shaft 120 and the assembly of the grinder blade 110 is completed.

At this time, in a state in which the assembly of the grinder blade 110 is completed, the inner rubber cushion ring 16 of the grinder blade fixing device 140 and the rubber cushion ring 17 of the upper plate maintain a compressed state while maintaining the grinder blade 110 and The binding force between the grinder fixing devices 140 is strengthened, and in addition, the slip phenomenon of the grinder blade 110 is prevented while the grinder blade 110 is prevented from spinning.

Here, various types of grinder blades, such as a type with a through hole in the center and a type with a screw hole in the center, may be applied to the grinder blade 110.

On the other hand, when replacing the grinder blade after using a hand grinder, when loosening the nut 130 using a tool such as a spanner, if the tool is hooked on the nut 130 and slightly turned, at the same time, the inner rubber cushion ring 16 And the rubber cushion ring 17 of the top plate pushes the nut 130 while recovering the restoring force, and when the nut 130 is turned in this state, the nut 130 is easily loosened, and eventually the force to loosen the nut 130 At the same time, it is possible to easily replace the grinder blade, such as quickly loosening it.

As described above, the present invention provides a new grinder blade fixing device combining an inner holder and an outer holder interposed between the inner and outer holders interposed between the inner and outer holders to absorb vibration and accommodate clamping force, etc. , Workability related to grinder blade replacement can be improved by accepting some of the nut clamping force for fixing the grinder blade, so that the nut can be firmly tightened and the nut can be easily loosened without effort.

In particular, by absorbing all the vibration or shaking that occurs during the operation of the grinder blade, workers can work comfortably and safely, and even when working for a long time and for a long period of time, there is no concern about occupational diseases such as hand shaking or pain. can be clearly ruled out.

10a, 10b: hole
11: inner rubber cushion ring mounting groove
12: inner holder
13: outer holder
14: space part
15: bearing
16: inner rubber cushion ring
17: Upper plate rubber cushion ring
18 : Embossing
19: outer holder protrusion
20: groove
21: rubber ring mounting groove
22: rubber ring
23: snap ring
24: inner holder protrusion

Claims (5)

A circular inner holder 12 having a hole 10a through which the drive shaft of the hand grinder passes through the center and an inner rubber cushion ring mounting groove 11 formed at the upper edge thereof;
A circular outer holder 13 that is in contact with the grinder blade using the upper surface portion, has a hole 10b through which the drive shaft of the hand grinder passes through the center, and is coupled to the outside of the inner holder 12 in a coaxial structure;
a bearing 15 installed in the space 14 formed between the inner holder 12 and the outer holder 13 to enable rotation between the inner and outer holders 12 and 13;
an inner rubber cushion ring 16 installed in the inner rubber cushion ring mounting groove 11 of the inner holder 12 and exerting an elastic force in a vertical direction;
Grinder blade fixing device of a hand grinder, characterized in that it comprises a.
The method of claim 1,
An upper plate rubber cushion ring 17 installed along the edge of the upper surface of the outer holder 13 to directly contact the bottom surface of the grinder blade and exert an elastic force in the vertical direction. Device.
The method of claim 2,
Grinder blade fixing device of a hand grinder, characterized in that embossing (18) is formed on the upper surface of the upper plate rubber cushion ring (17) in a form in which concave and convex portions are repeated along the circumferential direction.
The method of claim 1,
At the center of the upper surface of the outer holder 13, a circular outer holder protrusion 19 protruding relatively than the upper surface is formed, and the outer holder protrusion 19 is inserted into the groove 20 of the grinder blade. Being coupled, it is possible to strengthen the binding relationship between the grinder blade and the outer holder 13, and at the same time, the grinder blade can be accurately installed in the correct position when the grinder blade is installed. Grinder blade fixing device of a hand grinder.
The method of claim 1,
A rubber ring mounting groove 21 is formed on the inner circumferential surface of the inner holder 12, and a rubber ring 22 for holding the radial flow of the hand grinder drive shaft is mounted in the rubber ring mounting groove 21. Grinder blade holder for hand grinders.

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