WO2023219220A1

WO2023219220A1 - Grinder with easily replaceable abrasive disc

Info

Publication number: WO2023219220A1
Application number: PCT/KR2022/019772
Authority: WO
Inventors: 서기홍; 손영민
Original assignee: 주식회사 메이크잇
Priority date: 2022-05-11
Filing date: 2022-12-07
Publication date: 2023-11-16
Also published as: KR20230002204U

Abstract

The present device relates to a grinder with an easily replaceable abrasive disc and, more particularly, to a grinder in which an abrasive disc can easily be replaced by assembling a holder for coupling and supporting the abrasive disc. The grinder with an easily replaceable abrasive disc comprises: a grinder main body which has a drive unit and a grip unit separately formed therein and a built-in motor for generating rotational force and in which a coupling end rotated at high speed by the motor protrudes from the drive unit; and a holder assembly having a hexagonal hole penetrating the upper and lower surfaces formed on a central axis, and composed of an insertion member seated and fixed to the grinder main body such that the coupling end is disposed inside the hexagonal hole, a power transmission member having a lower portion coupled to the coupling end through the hexagonal hole and an upper portion into which the central portion of the abrasive disc is inserted and fixed, and a fixing member that fixes the insertion member to the grinder main body.

Description

Grinder with easy to replace abrasive discs

The present invention relates to a grinder in which a polishing disk can be easily replaced, and more specifically, to a grinder in which a polishing disk can be easily replaced by assembling a holder that couples and supports the polishing disk.

A grinder, also known as a grinding machine or polishing machine, is a power tool used to smooth the surface of a primary processed object or cut or cut parts of raw materials using a high-speed rotating disk-shaped blade or circular saw. Depending on the purpose and mobility, it is divided into fixed type and mobile type. In general, fixed grinders are used to process large quantities of workpieces at a certain location, and mobile grinders are used to process small amounts of workpieces at multiple locations. In addition, the grinder operates a rotating shaft at high speed by pressure generated by driving an electric motor or operating a compressor, and the polishing disk mounted on this rotating shaft rotates together to polish the surface of an object made of stone, metal, etc. It is common to perform

Conventional grinders used a structure in which a polishing disk was coupled to the rotating shaft of the grinder body using a wrench, nut, spanner, etc. In other words, in order to fasten the polishing disk, it must be coupled to the rotating shaft using additional means, and in the case of a grinder that is fastened by communicating the hole of the rotating shaft and the polishing disk, it is difficult to replace parts, so there are problems such as having to replace the entire grinder. there was.

As related prior art, Korean Patent Publication No. 10-2045341 (Grinder blade fixing device for hand grinder) is disclosed. Korean Patent Publication No. 10-2045341 (Grinder blade fixing device for hand grinder) relates to a fixing device used to easily attach and remove grinder blades such as cutting stones, polishing stones, etc. from the grinder shaft. There is an advantage in that the grinder blade can be fixed more easily and simply by screwing in the auxiliary means for fastening the grinder blade. However, since the means for fixing the auxiliary means consisting of the body, holder, stopper, spring, etc. to the drive shaft is provided with only female and male threads, it is formed to receive rotational force directly from the drive shaft during cutting and polishing work, so the drive shaft can be easily damaged. It can be damaged, and if the drive shaft is damaged, the entire hand grinder must be replaced, so there is an urgent need to develop technology to improve this.

One purpose of the present invention is to provide a grinder in which the grinder blades can be easily replaced and the grinding disk can be easily replaced, thereby improving the convenience and speed of work.

In addition, another purpose of the present invention is to prevent direct damage to the drive shaft by coupling a separate power transmission member to the drive shaft, and to provide a grinder with an easy to replace abrasive disc formed by assembling each part so that it can be individually replaced in case of damage. It is provided.

Another object of the present invention is to provide a grinder that can easily replace the abrasive disk, which can be easily coupled to the grinder body regardless of the shape and type of the disk, by providing a disk holder that combines the abrasive disk and the grinder body. It is provided.

A grinder body that is divided into a driving part and a grip part and has a built-in motor that generates rotational force, and a coupling end that is rotated at high speed by the motor is protruding from the driving part; A hexagonal hole penetrating the upper and lower surfaces is formed on the central axis, and an insertion member is seated and fixed to the grinder body so that the coupling end is disposed inside the hexagonal hole, and the lower side penetrates the hexagonal hole and is coupled to the coupling end, The upper side is a holder assembly consisting of a power transmission member into which the center of the polishing disk is inserted and fixed, and a fixing member that secures the insertion member to the grinder body. A grinder in which the polishing disk can be easily replaced. This is the gist of the present invention.

The grinder body is formed to have a coupling end disposed at the center, is formed as a circular shape and has a certain thickness and protrudes upward, and has an installation end through which one or more first fastening holes are formed on the outer peripheral surface. It is desirable to have a grinder in which the grinding disk can be easily replaced.

The insertion member has a cylindrical shape, and has an expansion portion formed at an upper end to be stepped with an expanded diameter, and a plurality of second fastening holes are formed in the expansion portion at a predetermined distance apart in the circumferential direction to selectively connect the first fastening hole. It is desirable to use a grinder in which the grinding disk is disposed in communication so that the grinding disk can be easily replaced.

The fixing member is composed of a semicircular molding part fitted to the outer peripheral surface of the installation end, and an extension part extending horizontally on the other side of the molding part and providing a space on the inside, the first fastening hole and the second fastening hole. a fixing cover in which a third fastening hole communicating with the fastening hole is formed penetrating the molded portion and the extension portion; an insertion pin inserted into the extension part and disposed through the first to third fastening holes; a spring inserted into one outer peripheral surface of the insertion pin and disposed inside the extension portion; A spring cover having a cylindrical shape with a hollow portion and inserted into the outer peripheral surface of the spring; It is composed of a plate-shaped pressure plate fixedly coupled to the other side of the insertion pin, and when pressure is applied to the pressure plate in one direction, the insertion pin moves in one direction and is inserted into the first to third fastening holes, thereby grinding the grinder. It is desirable to use a grinder that allows easy replacement of the abrasive disk, which is characterized by fixing the main body and the insertion member.

The fixing cover is preferably formed integrally with the grinder body or is detachable from the grinder body so that the grinding disk can be easily replaced.

The power transmission member has male threads formed on the outer peripheral surface of the lower end and is fixed by threading with female threads formed on the inside of the coupling end, the lower surface of the middle part is seated on the upper surface of the insertion member, and the outer peripheral surface of the upper end has male threads. It is desirable to use a grinder in which the polishing disk can be easily replaced, wherein the grinder is fixed by being threaded with a female thread formed inside the center of the polishing disk.

The polishing disk is divided into an upper assembly and a lower assembly, installed in the center of the polishing disk, and has a female thread formed on the inside, and a disk holder threaded with the male thread formed on the outer peripheral surface of the upper end of the power transmission member. It is preferable that the grinder is configured so that the polishing disk can be easily replaced by releasing the thread coupling of the disk holder to replace the polishing disk.

Through the present invention, there is an effect of providing a grinder with an easily replaceable abrasive disk that can improve the convenience and speed of work by easily replacing the grinder blade.

In addition, by combining a separate power transmission member with the drive shaft, direct damage to the drive shaft is prevented, and each part is assembled so that individual replacement is possible in case of damage, thereby providing a grinder with an easily replaceable abrasive disk.

In addition, by providing a disk holder that couples the polishing disk and the grinder body, there is an effect of providing a grinder with an easily replaceable polishing disk that can be easily coupled to the grinder body regardless of the shape and type of the disk.

Figure 1 is an exploded perspective view of a grinder in which a polishing disk can be easily replaced according to the present invention.

Figure 2 is an assembled perspective view of a grinder in which the polishing disk of the present invention can be easily replaced.

Figure 3 is a perspective view showing the insertion member of the grinder that facilitates replacement of the polishing disk according to the present invention.

Figure 4 is a perspective view showing the fixing member of the grinder, which allows easy replacement of the polishing disk according to the present invention.

Figure 5 is a cross-sectional view of the disk holder inserted into the polishing disk used in the grinder of the present invention in which the polishing disk can be easily replaced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. The terms used in the present invention have been selected as widely used general terms as possible while considering the functions in the present invention, but this may vary depending on the intention or precedent of a technician working in the field, the emergence of new technology, etc. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than simply the name of the term.

Also, when a part is said to "include" a certain element throughout the specification, this means that it does not exclude other elements but may further include other elements, unless specifically stated to the contrary.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Looking at an embodiment of the present invention with reference to the drawings below, the grinder of the present invention in which the polishing disk can be easily replaced is largely composed of a grinder body 100 and a holder assembly 200.

The grinder body 100 is divided into a drive unit 110 and a grip unit 120, and a motor that generates rotational force is built into the inside, and a coupling end 111 that is rotated at high speed by the motor protrudes from the drive unit 110. is formed

The drive unit 110 is a part of the grinder that rotates, and the grip unit 120 can be defined as a part where the user holds the grinder body 100 so that the user can control the working direction of the drive unit 110.

The coupling end 111 is formed with a female thread penetrating in the vertical direction, and the lower end of the female thread may be coupled to the end of a drive shaft rotated by a motor.

At this time, it is preferable that the drive shaft and the female thread of the coupling end 111 are coupled and rotated together without turning loosely, so that the rotational force can be transmitted directly from the coupling end 111.

The holder assembly 200 consists of an insertion member 210, a power transmission member 220, and a fixing member 230.

The insertion member 210 has a hexagonal hole 211 formed on a central axis penetrating the upper and lower surfaces, and the lower end may be formed to be inserted into one side of the grinder body 100.

At this time, when the insertion member 210 is coupled to the driving unit 110 of the grinder body 100, the coupling end 111 is formed to be disposed inside the hexagonal hole 211.

In addition, it is preferable that the size of the hexagonal hole 211 is larger than the coupling end 111 so as to prevent friction against the hexagonal hole 211 when the coupling end 111 is rotated.

The power transmission member 220 has a middle portion seated on the upper surface of the insertion member 210, and a lower portion is inserted into the hexagonal hole 211 of the insertion member 210 and fastened to the female thread of the coupling end 111, At the upper end, the center of the polishing disk (D) is inserted and fastened.

The fixing member 230 fixes the insertion member 210 to the grinder body 100, and can fix or release the insertion member 210 to the grinder main body 100 with a one-touch method.

As an example, the grinder body 100 of the grinder in which the polishing disk can be easily replaced according to the present invention may be configured to include an installation end 112.

The installation end 112 is circular and has a certain thickness and is formed to protrude upward, with the coupling end 111 disposed at the center.

That is, the lower side of the insertion member 210 is inserted into the installation end 112, and the coupling end 111 is disposed at the center.

In addition, one or more first fastening holes 113 are formed on the outer peripheral surface of the installation end 112.

Additionally, the insertion member 210 may have a cylindrical shape and may include an expansion portion 212 that is stepped at an upper end with an expanded diameter.

At this time, second fastening holes 213 are formed in the expansion portion 212 at a certain distance apart in the circumferential direction, so that when the insertion member 210 is placed inside the installation end 112, the first fastening holes 113 and The second fastening hole 213 is arranged to communicate.

And, the fixing member 230 for fixing the insertion member 210 inserted into the installation end 112 includes a fixing cover 231, an insertion pin 235, a spring 236, a spring cover 237, and a pressure plate. It can be composed of (238).

The fixing cover 231 includes a semicircular molding portion 232 that is molded to the outer peripheral surface of the installation end 112, and an extension portion 233 that extends horizontally on the other side of the molding portion 232 and provides a space on the inside. It can be composed of:

At this time, the fixing cover 231 has a third fastening hole 234 that communicates with the first fastening hole 113 and the second fastening hole 213 formed in the inner space.

The insertion pin 235 is a pin whose middle portion has a protruding tongue step diameter, and one side extension portion and the other side extension portion are formed based on the middle portion.

At this time, it is preferable that one side extension part and the other side extension part are formed with a smaller diameter than the middle part.

The spring 236 is inserted and disposed on one outer peripheral surface of the insertion pin 235, that is, the outer peripheral surface of one side extension.

In addition, the spring cover 237 has a cylindrical shape with a hollow portion, and is inserted and disposed on the outer peripheral surface of the spring 236 inserted into one side extension part.

*The pressure plate 238 has a disk shape and is fixedly coupled to the other end of the insertion pin 235 to expand the contact area and easily press the insertion pin 235.

At this time, a female thread is formed at the center of the pressure plate 238, and a male thread is formed at the other end of the insertion pin 235, so that they can be fixed by screwing.

That is, the insertion member 210 is inserted into the grinder body 100 and the insertion member 210 is rotated so that the first fastening hole 113 and the second fastening hole 213 communicate with each other. Then, the fixing cover 231 is fitted on the outer peripheral surface of the installation end 112, and the third fastening hole 234 is arranged to communicate with the first fastening hole 113 and the second fastening hole 213, and is located on the inside. Insert the insertion pin (235). At this time, the spring 236 and the spring cover 237 are inserted into the third fastening hole 234 at one side extension of the insertion pin 235, and the pressure plate 238 is at the other end of the insertion pin 235. ) is combined and fixed.

In addition, the fixing member 230 is a knocking method applied to a ballpoint pen. When the insertion pin 235 is pressed while the fixing member 230 is coupled, the insertion pin 235 is pressed into the first to third fasteners. It is inserted into the

holes

113, 213, and 234 to fix the insertion member 210 to the grinder body 100, and when pressed again, the insertion pin 235 moves in the other direction and the fixation is released.

As another embodiment, the fixing cover 231 of the grinder, which allows the polishing disk of the present invention to be easily replaced, may be formed to be detachable from or integral with the grinder body 100.

When formed to be detachable, the molding portion 232 of the fixing member 230 may be separately provided with a fixing member (not shown) so that it can be fixed to the grinder body 100, and a fastening hole to which the fixing member is fastened ( (not shown) is preferably provided on the grinder body 100 and the fitting portion 232, respectively.

When formed integrally, the fixing cover 231 of the fixing member 230 is formed integrally with the grinder body 100, and the second fastening hole 213 and the third fastening hole 234 are fixed in a connected state. An insertion pin 235 is fastened to the inside.

In addition, the polishing disk D used in the grinder of the present invention in which the polishing disk can be easily replaced may be configured to include a disk holder 240.

The disk holder 240 is divided into an upper assembly and a lower assembly and is installed at the center of the polishing disk (D).

At this time, a thread hole in which a female thread is formed is formed in the center of the disk holder 240 in the fastened state, and is formed to be threadedly coupled to the outer peripheral surface of the upper end of the power transmission member 220.

Therefore, the thread coupling of the disk holder 240 is released, the disk holder 240 is dismantled, the polishing disk D is replaced, and then the polishing disk D is reattached to the power transmission member 220. can be detached from the grinder body 100.

For example, the upper assembly and the lower assembly each have a stepped cylindrical shape, the upper assembly has an expanded diameter at the upper end, and the lower assembly has an expanded diameter at the lower end. At this time, a female thread is formed in the center of the upper assembly, and a male thread is formed on the outer peripheral surface. And, a female thread is formed in the center of the lower assembly and is connected to the outer peripheral surface of the upper assembly. That is, if the upper assembly is placed on the upper side of the center hole of the polishing disk (D) and the lower assembly is placed on the lower side and fastened up and down on the inner peripheral surface of the center hole of the polishing disk (D), the upper assembly is threaded to the inner peripheral surface of the lower assembly and the disk is formed. A holder 240 is installed within the polishing disk D.

As described above, the basic technical idea of the present invention relates to a grinder in which the polishing disk can be easily replaced. More specifically, it relates to a grinder in which the polishing disk can be easily replaced by assembling a holder that combines and supports the polishing disk. will be.

Of course, various modifications are possible by those skilled in the art within the scope of the basic technical idea of the present invention, and therefore, the scope of the present invention should be interpreted within the scope of the patent claims written to include various modified examples. will be.

100: Grinder body

110: driving unit

111: binding end

112: Installation end

113: 1st fastening hole

120: grip part

200: Holder assembly

210: Insertion member

211: hexagonal hole

212: extension part

213: 2nd fastening hole

220: Power transmission member

230: fixing member

231: Fixed cover

232: joint part

233: extension part

234: Third fastening hole

235: insertion pin

236: spring

237: Spring cover

238: pressure plate

240: Disk holder

D: Abrasive disc

Claims

A grinder body that is divided into a driving part and a grip part and has a built-in motor that generates rotational force, and a coupling end that is rotated at high speed by the motor is protruding from the driving part;

A hexagonal hole penetrating the upper and lower surfaces is formed on the central axis, and an insertion member is seated and fixed to the grinder body so that the coupling end is disposed inside the hexagonal hole, and the lower side penetrates the hexagonal hole and is coupled to the coupling end, The upper side is a holder assembly consisting of a power transmission member into which the center of the polishing disc is inserted and fixed, and a fixing member for fixing the insertion member to the grinder body;

A grinder with an easy to replace abrasive disk, characterized in that it includes a.
According to paragraph 1,

The grinder body is,

Replacement of the polishing disk, characterized in that it includes an installation end formed so that the coupling end is disposed at the center, is formed in a circular shape and has a certain thickness and protrudes upward, and has at least one first fastening hole formed through the outer circumferential surface. Easy grinder.
According to paragraph 2,

The insertion member is

It has a cylindrical shape, and the upper end is provided with an expanded portion that is stepped with an expanded diameter,

A grinder that facilitates replacement of the polishing disk, wherein a plurality of second fastening holes are formed in the expansion portion at a predetermined distance apart in the circumferential direction and are selectively communicated with the first fastening holes.
According to paragraph 3,

The fixing member is,

It consists of a semicircular molding part fitted to the outer peripheral surface of the installation end, and an extension part extending horizontally on the other side of the molding part and providing a space on the inside, and communicating with the first fastening hole and the second fastening hole. a fixing cover having a third fastening hole formed through the molding portion and the extension portion;

an insertion pin inserted into the extension part and disposed through the first to third fastening holes;

a spring inserted into one outer peripheral surface of the insertion pin and disposed inside the extension portion;

A spring cover having a cylindrical shape with a hollow portion and inserted into the outer peripheral surface of the spring;

It is plate-shaped and consists of a pressure plate fixedly coupled to the other side of the insertion pin,

When pressure is applied to the pressure plate in one direction, the insertion pin moves in one direction and is inserted into the first to third fastening holes, thereby fixing the grinder body and the insertion member. grindstone.
According to paragraph 4,

The fixed cover is,

A grinder with an easily replaceable polishing disk, characterized in that it is formed integrally with the grinder body or is formed to be detachable.
According to paragraph 1,

The power transmission member is,

A male thread is formed on the outer peripheral surface of the lower end and is threaded and fixed with a female thread formed on the inside of the coupling end,

The lower surface of the middle portion is seated on the upper surface of the insertion member,

A grinder that allows easy replacement of the polishing disk, wherein a male thread is formed on the outer peripheral surface of the upper portion and is fixed by threading with a female thread formed inside the center of the polishing disk.
According to clause 6,

The polishing disk is,

A disk holder is formed separately into an upper assembly and a lower assembly, installed in the center of the polishing disk, and has a female thread formed on the inside, and is thread-coupled with a male thread formed on the outer peripheral surface of the upper end of the power transmission member.

A grinder that facilitates replacement of the polishing disk, characterized in that the polishing disk is replaced by releasing the thread coupling of the disk holder.