KR20230095724A - Grinder blade fixing device for Hand Grinder - Google Patents

Abstract

The present invention relates to a disk holding device for a hand grinder, in which the disk replacement can be performed easily and safely, and the disk can be used interchangeably with a dedicated or universal holding device, the hand grinder is provided with a rotating shaft, and the rotating shaft In the disk fixing device of a hand grinder for mounting a disk for cutting, polishing, and processing of an object, a rotating shaft is provided with a holder that is fastened in a spiral manner, but the disk is provided with a mounting wheel for assembly with the holder to be mutually assembled. The holder forms a hollow structure socket in the center of the plate for fastening with the rotating shaft, but on the upper surface of the plate, a plurality of 'L'-shaped fastening protrusions formed with a crossbar bent at the top of the vertical bar are centered on the socket. Arranged radially, and the mounting wheel forms a fixed plate part manufactured by injection molding at the center of the disk, and the fastening protrusion is inserted into the fixed plate part to prevent separation by the crossbar, and the fastening part composed of the insertion hole and the rib In addition, stopper protrusions and stopper grooves are formed on the crossbar of the fastening protrusion and the rib of the fastening part to correspond to each other so that when the user attaches or removes the disk, it is engaged and fixed with one touch or separated with one touch.

Description

Disk fixing device of hand grinder {Grinder blade fixing device for 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 replacement operation that can be performed easily and safely, and to fix the disk to a dedicated or general purpose fixing device. It relates to a disc holding device for a hand grinder that can be used interchangeably.

In general, a hand grinder is a tool used to cut metal workpieces or structures or to polish the surface smoothly. A wheel equipped with blades, that is, a disk, is fastened, and a cutting or polishing operation can be performed while rotating a rotating shaft at high speed using a motor or a compressor.

The disk mounted on the hand grinder is made in the shape of a disc, and an installation hole is formed in the center to be fixed to the rotating shaft of the hand grinder. In the past, a method of simply fixing using a nut was used, but a method of fixing using a nut However, since a special tool must be used, it is cumbersome to attach and detach the disk, and it takes a long time to replace it.

In particular, in a work process in which the disk consumption rate is very fast, the disk replacement is performed very frequently, but there is a problem in that the time required to replace the disk is too long compared to the actual working time.

In addition, there is a problem that the nut and the disk are fixed by heat when grinding for a long time even at a work site where the consumption of the disk is very slow, and there is a frequent problem that the disk is not easily separated even when a tool is used.

Therefore, various types of disk fixing devices have recently been proposed. For example, as in Korean Patent Registration No. 1838740 (2018.03.08), the disk is assembled to engage the first body and the second body, and the first body An elastic part is provided in the linear motion part to which the part and the second body are mounted, so that the disk is fixed with one touch by the elastic restoring force of the elastic part. Conversely, when the disk is separated, a disk fixing device is provided so that the disk can be separated with one touch by pressing the surface of the disk. has been proposed

In addition, in Patent Publication No. 10-2019-0027506 (Mar. 15, 2019), Registered Patent No. 10-2037521 (October 22, 2019), and Utility Model Registration No. 20-0493410 (Mar. 22, 2021), grinder discs Various types of disk fixing devices capable of fastening the one-touch fastening method have been proposed.

However, these conventional one-touch disk fixing devices have a problem in that the disk fixing structure is too complicated, and the manufacturing cost is also very high, so they are not widely popularized.

In particular, since such a one-touch disk fixing device is fastened only when a coupling structure is exclusively combined, there is an inconvenience in that a dedicated disk must be purchased and used.

In addition, since it is not compatible, it is impossible to share between workers, and there is a hassle that a general fastening type disk and a dedicated disk must always be provided.

The present invention is to solve the above problems, and provides a fixture mounted on a grinder and a wheel provided on a disk exclusively so that the disk fastening and separation structure can be conveniently performed in a one-touch method, as well as the fastening structure and manufacturing thereof was made to simplify it.

In addition, even if the grinder is not equipped with a dedicated fixture, the exclusive wheel of the disc can be mounted on the fixed part of the commercial grinder.

The present invention as a technical concept for achieving the above object is a hand grinder disk fixing device in which a rotating shaft is provided on the hand grinder and a disk is mounted on the rotating shaft for cutting, grinding, and processing of an object, the rotating shaft is spirally A holder to be fastened is provided, but the disk is provided with a mounting wheel for assembly with the holder to be mutually assembled, and the holder forms a socket of a hollow structure in the center of the plate for fastening with the rotating shaft, but on the upper surface of the plate At the top of the upright stand, a plurality of 'L'-shaped fastening protrusions formed by bending the crossbar are radially arranged around the socket, and the mounting wheel forms a fixing plate part manufactured by injection molding at the center of the disk, but the fixing plate part The fastening protrusion is inserted to form a fastening part composed of an insertion hole and a rib so that separation is prevented by the crossbar, and a stopper protrusion and a stopper groove are formed to correspond to each other on the crossbar of the fastening protrusion and the rib of the fastening part, so that the user mounts the disk. It is designed so that it is engaged and fixed with one touch or separated with one touch.

In addition, the plate is formed in a circular shape, and a circular inner portion is formed so that the plate can be inserted into the fixed plate portion where the plate is assembled facing each other so that the plate is supported on the inner wall of the inner portion and is accurately positioned at the center of the axis without being separated. do.

In addition, by using a through hole formed in the center of the fixing plate, a high tide adapter is attached to one side of the disk and a wheel nut is attached to the other side, enabling the disk to be fixed by tightening. In the case of a product having a specified direction, an anti-locking portion is formed to prevent the mounting wheel from being fastened when assembling the mounting wheel with respect to the holder, so that selective assembly is possible on both sides or on one side.

According to the disk fixing device of the hand grinder of the present invention, in a state in which the holder is assembled in a spiral structure on the rotating shaft of the hand grinder, the holder and the mounting wheel are one-touch Conversely, if you want to separate the disk, rotate the disk by a predetermined angle in the opposite direction while holding the holder in place, and the wheel can be easily separated from the holder in a one-touch manner. When attaching or detaching a disk to or detaching, it is easy to mount or detach with one-touch method without using special tools, which makes work convenient and effectively saves disassembly and assembly time.

In addition, since the structure of the holder and the mounting wheel can be simplified and manufactured at low cost by molding, it is very economical, and the method of use is also very intuitive without the need for training or knowledge, so even beginners can use it simply.

In addition, since the disc of the present invention can be used in a commercial mounting structure in which the disc is fixed using a high tide adapter and a wheel nut, rather than the exclusive holder of the present invention, the disc can be used universally.

In addition, in the case of disks used for the purpose of cutting, there are products whose direction is specified. In the case of mounting these products in the reverse direction, the disk mounting direction can be specified by making it impossible to mount the disk, so it can be used very safely.

1 is a structural diagram of a disk holding device of a hand grinder of the present invention
Figure 2 is an enlarged view showing the mounting structure of the holder and the mounting wheel of Figure 1
Figure 3 is a state diagram in which the holder is mounted on the rotating shaft of the hand grinder of the present invention
Figure 4 is a detailed view showing the mounting wheel structure of the present invention
Figure 5 is a cross-sectional view showing a state in which the disk is mounted on the rotating shaft using the disk fixing device of the present invention
6 is a state diagram in which a disk is mounted on a rotating shaft using the disk fixing device of the present invention
Figure 7 is an assembled cross-sectional view of Figure 5
8 is a use state diagram using a disk equipped with a mounting wheel of the present invention in a commercial disk fixing device
9 is a state diagram in which the disk of FIG. 8 is assembled to a hand grinder;
Figure 10 is a cross-sectional assembly of Figure 9
11 is another embodiment of the mounting wheel of the present invention
12 is the present invention

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

As shown in FIGS. 1 and 2, the hand grinder disk fixing device of the present invention is provided with a rotating shaft 1 on the hand grinder, and a disk 2 is mounted on the rotating shaft for cutting, polishing, and processing of an object. It relates to a disk holding device of a hand grinder, and the disk holding device of the present invention includes a holder 100 that is screwed to a rotating shaft 1 in a spiral manner, and a mounting provided for assembling the disk 2 with the holder 100 It is characterized in that the wheel 200 is provided so that the holder 100 and the mounting wheel 200 are mutually assembled so that the disk can be mounted on or separated from the hand grinder in a one-touch manner.

As shown in FIG. 3, the holder 100 has a hollow socket 140 formed in the center of the plate 120 for fastening with the rotating shaft, and the upper surface of the plate 120 has a vertical stand 162. An 'L'-shaped fastening protrusion 160 with a crossbar 164 bent is formed at the top, and a plurality of fastening protrusions 160 are radially arranged around the socket 140.

As shown in FIG. 4, the mounting wheel 200 has a fixing plate part 220 manufactured by injection molding at the center of the disk, and the fastening protrusion 160 is inserted into the fixing plate part to cross bar 164. The attachment part 260 composed of the insertion hole 262 and the rib 264 is formed to prevent separation, and the crosspiece 164 of the fastening protrusion 160 and the rib 264 of the attachment portion 260 are interlocked and fixed in pairs.

At this time, the fastening protrusion 160 is configured so that the mounting wheel 200 is fastened in the opposite direction to the rotation axis of the rotation shaft 1 of the hand grinder when the disk 2 is mounted, so that the holder 100 during operation of the hand grinder And the fastening state of the mounting wheel 200 is more firmly assembled without being separated arbitrarily.

In addition, a stopper protrusion 166 and a stopper groove 266 are formed on the fastening protrusion 160 and the fastening portion 260 to correspond to each other, so that when the disc 2 is mounted on the hand grinder, the mounting wheel of the disc 2 ( 200) can be engaged and fixed with the holder 100 with one touch.

At this time, as a structure for engaging and assembling the stopper protrusion 166 and the stopper groove 266, at least one of the holder 100 or the mounting wheel 200 is made of an injection molded material such as synthetic resin to have its own elasticity, When the disk is mounted on the hand grinder, it can be combined in a forced fitting method by the self-elasticity of the material itself while rotating the disk. Also, in the state where the disk is mounted, it is possible to prevent the disk mounting wheel 200 from being arbitrarily separated from the holder 100.

To this end, an insertion hole 262 and a rib 264 are formed in the fixed plate part 220 of the mounting wheel 200 so that the plate 120 can be inserted into the fastening part 260, so that the fastening protrusion of the holder 100 When the rib 160 is inserted into the fastening part 260, the rib 164 is inserted through the insertion hole 262, and as the disk rotates, the rib 164 and the rib 264 come into close contact with each other and are fixed.

At this time, the crossbar 164 and the rib 264 are fastened to the surfaces facing each other in an interlocking structure of the stopper protrusion 166 and the stopper groove 266.

Therefore, as shown in FIGS. 5 to 8, in a state in which the holder 100 is assembled in a spiral structure on the rotating shaft 1 of the hand grinder, the mounting wheel 200 of the disk 2 is brought into close contact with the holder 100 and pressed. If the holder 100 and the mounting wheel 200 are fastened with one touch and rotated only by a predetermined angle after insertion, assembly is simply performed. On the contrary, if the disk is to be separated, the disk is rotated in the opposite direction while the holder 100 is fixed. When rotated by a predetermined angle, the mounting wheel 200 is easily separated from the holder 100 in a one-touch manner.

At this time, the insertion hole 262 is formed at a position corresponding to the fastening protrusions 160 arranged radially, or if formed relatively more than the number of fastening protrusions, such as a multiple of the fastening protrusions 160, the fastening protrusions ( 160) is selectively inserted from among the plurality of insertion holes 262, making custom fastening easier.

In addition, the fixing plate part 220 of the mounting wheel 200 has a circular inner part 280 in which the insertion hole 262 and the rib 264 are stepped so that the plate 120 can be inserted into the fastening part 260. ) Can be formed, the plate 120 is formed in a circular shape to correspond to the flat cross section of the inner portion 280, the outer periphery of the plate 120 is not separated by the inner wall of the inner portion 280 In the state where the disk is inserted so as not to be inserted, the disk is accurately mounted on the center of the axis of rotation, and the disk is mounted and separated by rotating between the holder 100 and the mounting wheel 200 so that the disk is mounted on the hand grinder rotating at high speed. It can be made to rotate stably in the state.

In addition, if the diameter of the inner part 280 is formed to correspond to the diameter of the high tide adapter 3 used in the commercial fastening structure as shown in Figs. The disk of the present invention can be mounted and used in a commercial fastening structure without using the holder 100 of the present invention.

That is, the inner diameter of the state in which the inner part 280 is inserted is formed to correspond to the outer diameter of the high tide adapter 3, and the seating part 3a protruding from the center of the high tide adapter 3 is the center of the fixing plate part 220. When using the hand grinder's disk assembly as a commercial fastening structure by inserting it into the through hole 240 formed in Later, since the disk 2 can be fastened by tightening it with the wheel nut 4, the fastening direction of the disk can be set in various ways according to the user's convenience according to the exclusive or commercial fastening structure or various sizes of the high tide.

At this time, a rim is formed in the center by the through hole 240, and when the disk 2 is inserted into the rotation shaft 1, the assembly of the mounting wheel 200 is guided in the right position, so that it can be easily assembled in the center.

In addition, the fixing plate unit 220 has stopper grooves 266 formed corresponding to both upper and lower surfaces of the rib 264 so that both sides can be fastened by reversing the fastening direction, but more preferably, the internal The part 280 is configured to be eccentric only on one side of the fixing plate part 220, so that the high tide adapter 3 is in close contact with one side of the disk and the wheel nut 4 is attached to the other side, so that the disk is fixed by tightening. It can be used more effectively in terms of reinforcement than a structure in which the parts 180 are disposed on both sides.

In addition, when the holder 100 is mounted on the rotating shaft 1 and used as a one-touch fastening structure for mounting a disk, the plate 120 of the holder 100 is seated and fixed while being inserted into the inner portion 280, and at this time, the plate The plate 120 is inserted into the inner portion 280 by making the outer diameter of the plate 120 and the inner diameter of the inner portion 280 correspond to each other so that the plate 120 does not move while being inserted into the inner portion 280. In the state in which the holder 100 and the mounting wheel 200 are fastened, it is possible to further secure stability for the operation of the hand grinder that rotates at high speed.

On the other hand, as a structure for integrally forming the mounting wheel 200 in the center of the disk 2, a step of integrating by insert molding is performed, so that the inner part 280 is in close contact with the inner wall. When manufacturing a disc by forming the jig groove 282, the fixing plate 220 may be made of a release material.

That is, the disk may be made of various materials for the purpose of cutting, polishing, etc. For example, in the case of manufacturing a cutting stone, a method such as press molding by sintering raw materials such as stone powder in the disk manufacturing process After first manufacturing the primary disk, the primary disk may be inserted and fixed to a molding machine to form the fixing plate portion 220 at the center of the primary disk.

At this time, the jig grooves 282 are formed to be in close contact with the inner wall of the inner part 280, and the jig grooves 282 are radially arranged to correspond to the number of insertion holes 262 or ribs 264, so that inside the molding machine Flow is prevented, resin is injected evenly with uniform pressure to make density uniform, and flow between the primary molded disk and the fixing plate 220 is prevented and stably maintained during the process of injecting, molding, and discharging raw materials. Molding is performed, and the upper and lower portions of the primarily molded disk can be integrally supported by the fixing plate 220 to be firmly supported.

On the other hand, in the case where the rotational direction is specified, such as a disk used for a specific purpose, that is, a tile cutting blade or a wood cutting blade, which is not a general cutting stone, the mounting direction of the disk is very important. ), it is possible to specify the assembly direction when assembling the holder 100 and the mounting wheel 200.

In more detail, if the anti-locking part 290 is formed to protrude from the mounting wheel 200 shown in FIG. 11, when assembling the mounting wheel 200 with respect to the holder 100, one side of the mounting wheel can be assembled The other side surface, that is, the surface on which the anti-lock portion 290 is formed, can specify the assembly direction of the disk by forcing the assembly not to occur.

As shown in the drawing, the locking protrusion 160 is formed by protruding a rim formed along the circumference of the through hole 240 or by forming a part of the surface of the fixing plate 220 to protrude. ) and the fastening part 260 are not completely interlocked with each other, so that the disk product having a specified mounting direction is not mounted in the reverse direction and can be assembled in only one direction so that the disk mounting direction can be specified.

1: axis of rotation 2: disk
3: high tide adapter 4: wheel nut
100: holder
120: plate
140: socket
160: fastening protrusion 162: vertical bar 164: cross bar
166: stopper projection
200: mounting wheel
220: fixed plate part
240: through hole
260: attachment part 262: insertion hole part 264: rib
266: stopper home
280: inner part
290: anti-locking unit

Claims (5)

In the disk fixing device of the hand grinder, the hand grinder is provided with a rotating shaft (1), and a disk (2) is mounted on the rotating shaft for cutting, polishing, or processing an object,
The rotary shaft 1 is provided with a holder 100 fastened in a spiral manner, and the disk 2 is provided with a mounting wheel 200 for assembly with the holder 100 so that mutual assembly is performed,
The holder 100 has a hollow socket 140 formed in the center of the plate 120 for fastening with the rotating shaft, and a cross bar 164 is provided at the top of the upright bar 162 on the upper surface of the plate 120. A plurality of fastening protrusions 160 in a bent 'L' shape are formed around the socket,
In the mounting wheel 200, a fixed plate part 220 manufactured by injection molding is formed in the center of the disk, and the fastening protrusion 160 is inserted into the fixed plate part to prevent separation by the cross bar 164 through an insertion hole. A binding portion 260 composed of 262 and rib 264 is formed,
A stopper protrusion 166 and a stopper groove 266 are formed to correspond to each other on the crossbar 164 of the fastening protrusion 160 and the rib 264 of the fastening portion 260, and are engaged and fixed with one touch Hand grinder, characterized in that of disk fixture. The method of claim 1, wherein the fixing plate part 220 of the mounting wheel 200 has a circular shape in which the insertion hole 262 and the rib 264 are stepped so that the plate 120 can be inserted into the fastening part 260. An inner portion 280 is formed,
The plate 120 is formed in a circular shape to correspond to the flat cross section of the inner portion 280, and the holder 100 is inserted so that the outer periphery of the plate 120 is not separated by the inner wall of the inner portion 280. ) And the disk fixing device of the hand grinder, characterized in that the disk is mounted and separated while rotating between the mounting wheel 200. The hand grinder according to claim 2, wherein the fixing plate part 220 has stopper grooves 266 formed corresponding to both upper and lower surfaces of the rib 264 so that both sides are fastened by reversing the fastening direction. disk fixture. The method of claim 2 or 3, wherein the fixing plate portion 220 is formed with a through hole 240 in the center,
The inner part 280 is configured to be eccentric only on one side of the fixing plate part 220, so that the high tide adapter is attached to one side of the disk and the wheel nut is closely attached to the other side of the disk, so that the disk is fixed by tightening. disk fixture. The mounting wheel 220 according to claim 4, when the mounting wheel 200 is assembled to the holder 100 in the through hole 240 formed along the surface of the fixing plate 220 or along the circumference of the through hole 240. A hand grinder disk fixing device, characterized in that the anti-locking part 290 is formed to prevent the fastening of the.

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