KR20220052704A - Disc holder for grinder - Google Patents

Abstract

The present invention relates to a grinder disc holder, which is able to improve the speed and convenience of work and secure stability, safety, and functions of products. According to an embodiment of the present invention, the disc holder for the grinder, which is a disc holder for a grinder, which is able to allow a disc to be attachable/detachable to/from the grinder, can comprise: a mainframe-side cover in a hollow cylindrical shape, and having an inner side surface partly closed; a hub formed in a hollow cylindrical shape on an inner side of a radius of the mainframe-side cover, and engaged with the mainframe-side cover to move together as one; a disc-side cover formed in a hollow cylindrical shape placed concentrically on an outer side of the radius of the hub, and placed on an outer side of the mainframe-side cover so that the hub can penetrate, and having an outer side surface partly closed; and a spring placed between an inner side surface of the mainframe-side cover and an outer side surface of the disc-side cover, and pushing the mainframe-side cover toward the inner side, and simultaneously pushing the disc-side cover toward the outer side. In accordance with a selective relative rotation of the disc-side cover and the hub, the disc can be pressurized to be fixed or released by the outer side surface of the disc-side cover and the outer side end of the hub.

Description

Grinder Disc Holder {DISC HOLDER FOR GRINDER}

The present invention relates to a grinder disc holder, and more particularly, to a grinder disc holder that allows the disc to be easily detached from the grinder.

In general, a grinder refers to a machine that grinds a workpiece using a grinding wheel, which is a rotating disc.

Among these grinders, a hand grinder developed so that an operator can hold and move the body by hand to perform more delicate work is generally referred to as a hand grinder. do. In this case, the main body refers to a housing having a built-in power source such as a motor and a supply providing energy such as electricity to the power source.

Here, the disk is divided into cutting stone and abrasive stone according to the purpose of processing such as cutting, cutting and grinding of the workpiece. A type suitable for the purpose should be selected.

Accordingly, the disk is provided to be detachably attached to the main body of the hand grinder, and it is required to quickly and safely replace the disk for efficient operation.

On the other hand, the hand grinder is divided into an electric type in which a motor supplied with power is a power source and an air type in which a turbine rotated by air transmitted from a compressor is a power source, and the problem of disc compatibility between these two types may be raised. . In other words, in the conventional two types, the shape of a portion connecting the main body of the hand grinder and the disk is different, and most of the products are incompatible between the two types, such as an electric-type dedicated disk and an air-type dedicated disk.

In addition, if only the quick replacement of the disk is focused, the fixing function of the disk is deteriorated, so that the processing performance is not guaranteed, or problems such as threatening the safety of the operator may be caused.

Accordingly, the present invention was created to solve the above problems, and an object of the present invention is to provide a grinder disc holder in which the stability, safety, and function of the product are secured while improving the convenience and speed of operation.

A grinder disc holder according to an embodiment of the present invention for achieving this object is a grinder disc holder that allows the disc to be detached from the grinder. A hub formed in a hollow cylindrical shape concentrically disposed inside the radius of the body-side cover and coupled to move integrally with the body-side cover, and a hollow cylindrical shape concentrically disposed outside the radius of the hub and a disk-side cover disposed on the outside of the main body-side cover so that the hub passes through, the outer surface of which is partially closed, and an inner surface of the main body-side cover and an outer surface of the disk-side cover; It may include a spring provided to push the main body side cover to the inside and at the same time to push the disk side cover to the outside.

According to the selective relative rotation of the disk-side cover and the hub, the disk may be fixed or released by being pressed by the outer surface of the disk-side cover and the outer end of the hub.

The main body side cover may include an inner cover cylindrical portion having a hollow cylindrical shape, and an inner blocking surface for closing an inner surface of the inner cover cylindrical portion with a uniform width in a radially inward direction from an outer periphery.

A circular through hole may be formed in the distal portion of the inner blocking surface.

The hub may include a hub cylindrical portion having a hollow cylindrical shape, and a plurality of pressing protrusions protruding from an outer surface of the hub cylindrical portion in a radially outward direction from an outer surface of the hub cylindrical portion.

An inner surface of the hub cylindrical portion may be coupled to the inner blocking surface so that the main body-side cover and the hub move integrally.

The outer diameter of the cylindrical hub portion and the inner diameter of the through hole may be formed to have the same size, and one surface of the hub cylindrical portion may be inserted into the through hole to be coupled such that the outer peripheral surface of the hub cylindrical portion and the inner peripheral surface of the through hole are in contact.

The plurality of pressing protrusions may be formed at equal intervals along the circumferential direction so as to be radially arranged.

The disk-side cover includes an outer cover cylindrical portion having a hollow cylindrical shape, an outer blocking surface closing the outer surface of the outer cover cylindrical portion with a uniform width in a radially inward direction from an outer periphery, and a radially inner end of the outer blocking surface In may include a locking protrusion that protrudes in a number corresponding to the pressing protrusion outward from the outer blocking surface.

A circular hub insertion hole into which the cylindrical hub portion is inserted may be formed in a distal portion of the outer blocking surface, and an inner surface of the outer cylindrical portion may be disposed to surround an outer surface of the inner cover cylindrical portion.

The plurality of locking protrusions may be formed at equal intervals along a circumferential direction so as to be radially arranged around the hub insertion hole.

The plurality of locking protrusions and the pressing protrusions may be formed in a shape corresponding to when viewed in a centrifugal extension direction.

The spring may push the inner blocking surface and the outer blocking surface.

In a state in which the outer cover cylindrical portion is disposed to surround the inner cover cylindrical portion, the spring may not be exposed to the outside.

The grinder disk holder according to an embodiment of the present invention may further include a bolt having a head portion disposed at an outer end of the hub, and a screw portion disposed to pass through the hub cylindrical portion.

The coupling of the body-side cover and the hub may be performed while the cylindrical hub portion is inserted into the hub insertion hole from the outside to the inside.

An outer circumferential surface of an inner surface of the hub cylindrical portion may be welded to an inner circumferential surface of the through hole in a state in which the hub cylindrical portion is inserted into the hub insertion hole from the outside.

When the outer surface of the locking protrusion is disposed so as to be in contact with the inner surface of the pressing protrusion and overlaps from the outside to the inside so that the locking protrusion and the pressure protrusion have the same phase based on the centrifugal force, the arrangement for mounting the disk and the detachment of the disk are possible can

The spring may have an elastic force in a contracted state by being pressed by the inner surface of the outer blocking surface and the outer surface of the inner blocking surface.

When the inner surface of the pressing protrusion moves toward the outer surface of the outer blocking surface while the locking protrusion and the pressing protrusion are radially staggered with respect to the centrifugal arrangement in the arrangement state for mounting the disk, both surfaces of the disk are the inner surface of the pressing protrusion and the It can be mounted so that the disk is not separated by being pressed by the outer surface of the outer blocking surface.

When the pressing protrusion and the locking protrusion are each formed in n pieces, they may be formed to have a thickness surrounding an arc having a circumference of 1/2n along the circumference of the hub cylindrical portion and the hub insertion hole, respectively.

The spring expands while pressing the inner surface of the outer blocking surface and the outer surface of the inner blocking surface, and may function to bring the inner surface of the pressing protrusion and the outer surface of the outer blocking surface closer to each other.

Each of the pressing protrusion and the locking projection is four, and the angle at which the disk-side cover rotates relative to the hub may be 45 degrees so that the pressing projection and the pressing projection are radially staggered with respect to the centrifugal axis.

The disk may form a working blade from the outer periphery to a uniformly uniform width in a radially inward direction, and a cap may be formed around a centrifugal circumference in a radially inward direction of the working blade.

A coupling hole having a shape corresponding to the circumferential shape of the outer surface of the hub cylindrical portion on which the pressing protrusion is formed when the hub is viewed in the centrifugal extension direction may be perforated around the distal circumference of the cap.

The length of the locking protrusion in the direction of the centrifugal extension of the disk side cover may be 6.5 mm or more.

When the locking protrusion and the pressing protrusion are radially staggered with respect to the centrifugal arrangement, the direction in which the disk-side cover rotates together with the disk may be a counterclockwise direction when viewed from the outside.

When the pressing protrusion and the locking protrusion are returned to their original positions to have the same phase with respect to the centrifugal force, the direction in which the disk-side cover rotates together with the disk may be a clockwise direction when viewed from the outside.

The hub includes a bolt head seating portion that is a section formed outside the hollow so that the head portion of the bolt is seated when a bolt for fastening with the rotation shaft of the grinder is provided, and the head portion having a larger outer diameter than the screw portion of the bolt. It may further include a step formed to be stepped in a radially inward direction from the inner diameter of the bolt head seating portion, and a bolt screw penetrating portion that is a section formed inside the hollow with the step as a boundary so that the screw portion is disposed while passing therethrough.

The head part may be disposed so as not to protrude outside the bolt head seating part.

A female thread may be formed on an inner circumferential surface of the bolt screw penetrating part to correspond to the thread thread of the threaded part.

The disk side cover may further include an outer rotation limiting protrusion protruding inward from the inner surface of the outer blocking surface.

The outer rotation limiting protrusion may protrude shorter than a length of the outer cover cylindrical portion in a centrifugal extension direction.

The main body-side cover includes a step portion uniformly protruding from the outer circumferential surface of the inner cover cylindrical portion along an outer periphery in a radially outward direction from the inner side of the inner cover cylindrical portion, and a concave-convex portion formed in a concave-convex shape from the outer circumferential surface of the step portion along the outer periphery and an inner rotation limiting protrusion protruding outward from the outer surface of the inner blocking surface by a pair so as to limit the bidirectional rotation of the outer rotation limiting protrusion to a predetermined angle during relative rotation of the disk side cover and the main body side cover may include

The inner rotation limiting protrusion may protrude shorter than a length of the inner cover cylindrical portion in a centrifugal extension direction.

The pair of inner rotation limiting protrusions may be disposed to be spaced apart by a predetermined angle along the circumferential direction so that the outer rotation limiting protrusions rotate at a limited angle therebetween.

The angle at which the rotation of the inner rotation limiting protrusion is restricted may be 90 degrees.

The main body side cover includes a protrusion formed from the outer periphery to a uniform width in a radially inward direction on the inner blocking surface, and the protrusion having a uniformly constant width from the inner periphery of the protrusion to the through hole in a radially inward direction. a relatively outwardly depressed depression, and a spring seating groove formed to be depressed inwardly from the outer surface of the inner blocking surface on the opposite surface of the inner blocking surface from the outer surface of the inner blocking surface according to the step shape of the projecting portion and the recessed portion may include more.

An inner end of the spring may be seated in the spring seat groove.

As described above, according to the embodiment of the present invention, it can be easy and at the same time compatible with the electric type and the air type with the disk.

In addition, replacement of the disk can be performed quickly and safely, and processing performance can be guaranteed together with the fixing function of the disk.

1 is a perspective view of a grinder disk holder according to an embodiment of the present invention.
2 is an exploded view of a grinder disk holder according to an embodiment of the present invention.
3 is a perspective view illustrating a state in which a body-side cover and a hub are coupled in the grinder disk holder according to an embodiment of the present invention.
4 is a perspective view before operation of the grinder disk holder according to the embodiment of the present invention.
5 is a perspective view before operation of the grinder disk holder according to an embodiment of the present invention.
6 is a perspective view after operation of the grinder disk holder according to an embodiment of the present invention.
7 is a perspective view after operation of the grinder disk holder according to an embodiment of the present invention.
8 is a perspective view of a disc detached by a grinder disc holder according to an embodiment of the present invention.
9 is a perspective view illustrating a state in which a disk is mounted by a grinder disk holder according to an embodiment of the present invention.
10 is a view showing a process in which a disk is mounted by the grinder disk holder according to an embodiment of the present invention in three steps (a, b, and c).
11 is a perspective view of a hub in a grinder disk holder according to an embodiment of the present invention;
12 is a cross-sectional view of a hub in a grinder disk holder according to an embodiment of the present invention.
13 is a perspective view of a disk side cover viewed from the outside in the grinder disk holder according to an embodiment of the present invention.
14 is a perspective view of a disk side cover in the grinder disk holder according to an embodiment of the present invention as viewed from the inside.
15 is a perspective view of the main body side cover in the grinder disk holder according to the embodiment of the present invention as viewed from the outside.
16 is a perspective view of the main body side cover viewed from the inside in the grinder disk holder according to the embodiment of the present invention.
17 is a perspective view of a state in which a spring is seated on a main body side cover in a grinder disk holder according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

1 is a perspective view of a grinder disc holder according to an embodiment of the present invention, and FIG. 2 is an exploded view of the grinder disc holder according to an embodiment of the present invention.

1 and 2, the grinder disc holder 1 according to an embodiment of the present invention includes a body side cover 100, a hub 200, a disc side cover 300, a spring 400, and bolt 500 .

The main body side cover 100 is formed in a hollow cylindrical shape with both sides of the cylinder open as a whole, and an empty inside. In addition, one surface of the inner cover cylindrical portion 110 having a hollow cylindrical shape is partially closed by the inner blocking surface 120 . Here, the inner blocking surface 120 is formed in a ring shape that closes one surface of the inner cover cylindrical part 110 with a uniform width in the radially inward direction from the outer periphery. Accordingly, a through hole 130 which is a circular hole of a certain size is formed in the distal portion of the inner blocking surface 120 .

Meanwhile, in this specification, the direction toward the main body of the grinder to which the grinder disk holder 1 is coupled is defined inwardly from the same viewpoint as the one surface of the inner cover cylindrical part 110 and the inner blocking surface 120, A direction away from the main body of the grinder, that is, a direction toward the disk 600 mounted by the grinder disk holder 1 will be defined as the outside. In other words, in the following description, one side and the inside or the other side and the outside of the components constituting the grinder disc holder 1 are one side and the inside or the opposite side of the inner cover cylindrical part 110 of the main body side cover 100 and Each refers to a part of the same direction.

The hub 200 is formed in a hollow cylindrical shape in which both sides of the cylinder are open as a whole, and the inside is empty. In addition, one surface of the hub cylindrical portion 210 having a hollow cylindrical shape is coupled to the inner blocking surface 120 of the main body side cover 100 . At this time, the outer diameter of the hub cylindrical part 210 and the inner diameter of the through hole 130 are formed to have the same size, and the outer peripheral surface of the hub cylindrical part 210 and the inner peripheral surface of the through hole 130 are in contact with each other. One surface of the cylindrical hub portion 210 may be inserted into the through hole 130 to be coupled thereto. That is, the cylindrical shape of the body-side cover 100 and the cylindrical shape of the hub 200 are concentrically arranged, and the hub 200 is fixed to the body-side cover 100 and moves integrally. Further, on the other surface of the hub cylindrical part 210 , a plurality of pressing protrusions 240 protrude from the outer peripheral surface of the hub cylindrical part 210 in a radially outward direction. Here, the plurality of pressing projections 240 are formed at equal intervals along the circumferential direction so as to be radially arranged, and four pressing projections 240 are shown in the drawing, but the present invention is not limited thereto.

The disk side cover 300 is formed in a hollow cylindrical shape in which both sides of the cylinder are open as a whole and the inside is empty. In addition, one surface of the outer cover cylindrical portion 310 having a hollow cylindrical shape is disposed to surround the inner cover cylindrical portion 110 . That is, the cylindrical shape of the main body side cover 100 and the cylindrical shape of the disk side cover 300 are arranged concentrically. Here, the inner diameter of the outer cover cylindrical portion 310 is formed to be greater than or equal to the outer diameter of the inner cover cylindrical portion 110, and is combined by a person skilled in the art (hereinafter referred to as a person skilled in the art) It may be designed to have a constant play between the inner circumferential surface of the outer cover cylindrical portion 310 and the outer circumferential surface of the inner cover cylindrical portion 110 for securing stability and relative rotational stability. Furthermore, the other surface of the outer cover cylindrical part 310 is partially closed by the outer blocking surface 320 . Here, the outer blocking surface 320 is formed in a ring shape that closes the other surface of the outer cover cylindrical part 310 with a uniform width in the radially inward direction from the outer periphery. Accordingly, the hub insertion hole 330, which is a circular hole of a certain size, is formed in the distal portion of the outer blocking surface 320 . The hub cylindrical portion 210 of the hub 200 is disposed to be inserted into the hub insertion hole 330 . Here, the inner diameter of the hub inserting hole 330 is formed to be greater than or equal to the outer diameter of the hub cylindrical portion 210, and the hub inserting hole 330 for securing coupling stability and relative rotational stability by those skilled in the art. It may be designed to have a certain clearance between the inner circumferential surface and the outer circumferential surface of the hub cylindrical portion 210 . Furthermore, a plurality of locking projections 340 are formed at equal intervals to be radially arranged around the hub insertion hole 330 of the outer blocking surface 320 . Here, the plurality of locking protrusions 340 protrude outwardly from the outer blocking surface 320 so as to correspond to the number of the pressing protrusions 240 , and four locking projections 340 are shown in the drawing, but limited to this. doesn't happen Meanwhile, the plurality of locking protrusions 340 and the pressing protrusions 240 may be formed in a shape corresponding to when viewed in the centrifugal extension direction.

The spring 400 is disposed between the main body-side cover 100 and the disk-side cover 300 , and pushes the inner blocking surface 120 to the inside and simultaneously pushes the outer blocking surface 320 to the outside. It is provided to push the In addition, in a state in which the outer cover cylindrical portion 310 of the disk side cover 300 is disposed to surround the inner cover cylindrical portion 110 of the main body side cover 100 , the spring 400 is not exposed to the outside. it may not be

The bolt 500 is formed in a conventional shape including a head portion 510 in which a part to which a tool is bound for a tightening operation is formed and a threaded portion 520 in which a thread is formed for fastening, and is optionally provided as necessary. . For example, when a thread-forming part, such as a stud bolt, is provided on the outer end of the rotary shaft like a conventional electric type grinder, the bolt 500 is not required, and the outer end of the rotary shaft like a conventional air type grinder. The bolt 500 is required when a thread forming part such as a nut is provided on the nut. In addition, when the bolt 500 is provided as needed, the head part 510 is disposed at the other end of the hub 200 , and the screw part 520 is disposed so that the screw part 520 passes through the hub cylindrical part 210 . do.

3 is a perspective view illustrating a state in which a body-side cover and a hub are coupled in the grinder disk holder according to an embodiment of the present invention.

As shown in FIG. 3 , the main body side cover 100 and the hub 200 are coupled to be integrated. The coupling of the main body side cover 100 and the hub 200 is such that the hub cylindrical portion 210 is inserted into the hub insertion hole 330 of the disk side cover 300 so that the pressing protrusion 240 does not interfere. It is performed in a state inserted from the outside to the inside. Here, the body-side cover 100 and the hub 200 may be combined by a method selected by a person skilled in the art, but welding is preferable as one of the methods. A welding point W welded in a state where the outer circumferential surface of one surface of 210 and the inner circumferential surface of the through hole 130 are in contact is schematically illustrated.

4 is a perspective view before operation of the grinder disk holder according to an embodiment of the present invention, and FIG. 5 is a perspective view before operation of the grinder disk holder according to an embodiment of the present invention. Here, before the operation of the grinder disc holder 1 refers to a state in which the disc 600 is detached from the grinder disc holder 1 and the disc 600 can be disposed for mounting.

4 and 5, the outer surface of the locking projection 340 of the disk side cover 300 is in contact with the inner surface of the pressing projection 240 of the hub 200 before the grinder disk holder 1 is operated. arranged to do That is, the pressing protrusions 240 and the locking protrusions 340 formed in a corresponding number are arranged to overlap from the outside to the inside so as to have the same phase based on the concentric centrifugal force. At this time, the spring 400 disposed between the outer blocking surface 320 of the disk side cover 300 and the inner blocking surface 120 of the main body side cover 100 is the outer blocking surface 320 . It has an elastic force in a contracted state by being pressed by the inner surface and the outer surface of the inner blocking surface 120 .

6 is a perspective view after operation of the grinder disk holder according to an embodiment of the present invention, and FIG. 7 is a perspective view after operation of the grinder disk holder according to an embodiment of the present invention. Here, after operation of the grinder disc holder 1 refers to a state in which the disc 600 can be mounted to the grinder disc holder 1 so that it cannot be detached.

As shown in FIGS. 6 and 7 , after the grinder disk holder 1 is operated, the inner surface of the pressing protrusion 240 of the hub 200 is the outer surface of the outer blocking surface 320 of the disk side cover 300 . placed in contact with That is, the pressing protrusions 240 and the locking protrusions 340 formed in a corresponding number are alternately arranged radially with respect to the concentric centrifugal force. In other words, the pressing protrusion 240 and the locking protrusion 340 are alternately arranged along the circumferential direction so that one pressing protrusion 240 is caught between the two locking protrusions 340 to prevent circumferential movement. are placed

On the other hand, in order to minimize or remove the gap with respect to the circumferential movement of the pressing protrusion 240 in a state in which the pressing protrusion 240 is caught between the engaging protrusions 340, the pressing protrusion 240 and the engaging protrusion ( When each n number 340 is formed, it is preferable to have a thickness surrounding an arc having a circumference of 1/2n along the circumference of the hub cylindrical portion 210 and the hub insertion hole 330 , respectively. At this time, when the disk 600 is mounted, the disk 600 is disposed between the inner surface of the pressing protrusion 240 of the hub 200 and the outer surface of the outer blocking surface 320 of the disk side cover 300 , The pressing protrusion 240 of the hub 200 and the outer blocking surface 320 of the disk-side cover 300 are not in contact, but the disk 600 disposed therebetween is pressed and fixed.

Here, the spring 400 disposed between the outer blocking surface 320 of the disk-side cover 300 and the inner blocking surface 120 of the main body-side cover 100 uses the above-described elastic force in the contracted state. It expands while pressing the inner surface of the outer blocking surface 320 and the outer surface of the inner blocking surface 120 , and the outer blocking surface 320 of the disk side cover 300 and the inner blocking surface 120 of the main body side cover 100 are expanded. ), the inner surface of the pressing protrusion 240 of the hub 200 and the outer surface of the outer blocking surface 320 of the disk side cover 300 become closer as the distances are further apart, and the disk 600 becomes the pressing projection ( 240) both sides are pressed and fixed by the inner surface and the outer surface of the outer blocking surface 320 .

Here, the force of the expansion of the spring 400 is preferably such that the inner surface of the pressing protrusion 240 and the outer surface of the outer blocking surface 320 come into close contact with each other and then pressurize with a set pressure. On the other hand, in order to operate in a state in which the pressing protrusion 240 and the locking protrusion 340 have the same phase with respect to the centrifugal and radially staggered with respect to the centrifugal axis, the hub 200 and the disk side cover ( 300) should be relatively rotated at a predetermined angle, and the force required for this relative rotation is preferably a degree that can be achieved by the operator's hand. In addition, the predetermined angle at which the disk side cover 300 is rotated relative to the hub 200 may be 45 degrees when the pressing protrusion 240 and the locking protrusion 340 are each of four, but is limited thereto. doesn't happen

8 is a perspective view of a disc detached by a grinder disc holder according to an embodiment of the present invention, FIG. 9 is a perspective view of a disc mounted by a grinder disc holder according to an embodiment of the present invention, and FIG. It is a view showing the process of mounting the disk by the grinder disk holder according to an embodiment of the present invention in three steps (a, b, and c). Meanwhile, an arrow is shown in FIG. 10 to visualize the operating direction of the configuration.

As shown in FIGS. 8 and 10 , the disk 600 detached by the grinder disk holder 1 is formed in a general disk shape as a whole. In addition, the disk 600 forms a conventional working blade 610 for cutting, cutting and grinding from the outer periphery to a uniformly constant width in the radially inward direction, and the radial inward direction of the working blade 610 A cap 640 is formed around the distal end. The cap 640 is provided so that the disk 600 can be mounted on the grinder disk holder 1, and around the distal circumference of the cap 640, the hub 200 can be viewed in the direction of the centrifugal extension. At this time, a coupling hole 645 punched in a shape corresponding to the circumferential shape of the outer surface of the hub cylindrical portion 210 on which the pressing protrusion 240 is formed is formed.

Accordingly, in a state in which the pressing protrusion 240 and the locking protrusion 340 have the same phase with respect to the centrifugal force, the pressing protrusion 240 and the locking protrusion 340 are connected to the disk through the coupling hole 645 . By being sequentially inserted into the 600, one surface of the disk 600 may be seated in contact with the outer surface of the outer blocking surface 320 (see FIGS. 4, 10(a), and 10(b)).

Here, after the disk 600 is seated, the locking protrusion 340 in the direction of the centrifugal extension of the disk side cover 300 so that relative rotation of the pressing protrusion 240 and the locking protrusion 340 is possible. It is self-evident that the length should be longer than the thickness of the disk 600, and when considering that the abrasive stone, which is usually the thickest disk type, has a thickness of 6T, in the direction of the centrifugal extension of the disk side cover 300, the 340) is preferably 6.5 mm or more, and may most preferably be 6.5 mm.

9 and 10 , in a state in which one surface of the disk 600 is seated in contact with the outer surface of the outer blocking surface 320 , the hub 200 and the disk side cover 300 rotate relative to each other. When the pressure protrusion 240 and the locking protrusion 340 are operated in a radially staggered arrangement with respect to the centrifugal force, the inner surface of the pressing protrusion 240 of the hub 200 and the outer side of the disk side cover 300 Both sides of the cap 640 are pressed and fixed by the outer surface of the blocking surface 320 (see FIGS. 6, 10(b), and 10(c)).

Accordingly, the disc 600 is prevented from being separated in the centrifugal extension direction by the pressing protrusion 240 and the outer blocking surface 320, and the stumbling block inserted into the coupling hole 645 of the corresponding shape. The disk 600 is prevented from rotating relative to the disk side cover 300 by the device 340 , ie, from being separated in the rotational direction.

Here, the disc side cover 300 together with the disc 600 is rotated relative to the hub 200 in a state in which it is pressed inward, so that the pressing protrusion 240 and the locking protrusion 340 are centrifugal. When the disc 600 is returned to its original position in a state having the same phase, the disc 600 is in a state capable of being detached from the grinder disc holder 1 . At this time, the disk side cover 300 is pressed inward together with the disk 600, and the force required for relative rotation with respect to the hub 200 is also preferably achieved by the hand of the operator, The disc side cover 300 together with the disc 600 in an operation in which the pressing protrusion 240 and the locking protrusion 340 have the same phase with respect to the centrifugal and radially staggered with respect to the centrifugal state. ) is rotated in a counterclockwise direction when viewed from the outside, and the disk 600 and The direction in which the disk side cover 300 is rotated is preferably a clockwise direction when viewed from the outside.

11 is a perspective view of a hub in the grinder disc holder according to an embodiment of the present invention, and FIG. 12 is a cross-sectional view of the hub in the grinder disc holder according to an embodiment of the present invention.

11 and 12 , the hub 200 further includes a bolt head seating portion 220 , a step 225 , a bolt screw through portion 230 , and a female thread 235 . Here, the hollow of the hub 200 is divided into the bolt head seating part 220 and the bolt screw penetrating part 230 .

The bolt head seating part 220 is a section formed outside the hollow of the hub 200 . In addition, when the bolt 500 is provided as needed, the head part 510 of the bolt 500 is seated on the bolt head seating part 220 . As such, by disposing the head part 510 not to protrude out of the bolt head seating part 220 , abrasion of the head part 510 , resistance and impact during operation are prevented, and stability and safety can be secured.

The step 225 is formed at a boundary between the bolt head seating part 220 and the bolt screw penetrating part 230 . It is apparent to those skilled in the art that the outer diameter of the head portion 510 is larger than the outer diameter of the screw portion 520 in a typical shape of the bolt 500 , and the step 225 has a larger outer diameter than the screw portion 520 . The head part 510 is formed to be stepped in a radially inward direction from the inner diameter of the bolt head seating part 220 so that the head part 510 is caught.

The bolt screw through portion 230 is a section formed inside the hollow of the hub 200 . In addition, when the bolt 500 is provided as needed, the screw portion 520 of the bolt 500 is disposed in the bolt screw through portion 230 . That is, the screw portion 520 passes through the bolt screw through portion 230 .

The female thread 235 is formed on the inner circumferential surface of the bolt screw through portion 230 . In addition, the female thread 235 has a corresponding thread shape to be fastened with the male thread formed in the thread part 520 of the bolt 500 . On the other hand, the female thread 235 is deleted, and the head part 510 is caught on the step 225 even if a male thread is not formed on the part of the thread part 520 disposed in the bolt screw penetration part 230 . Easy bolting is possible in the state.

13 is a perspective view of the disk-side cover in the grinder disk holder according to the embodiment of the present invention as viewed from the outside, and FIG. 14 is a perspective view of the disk-side cover in the grinder disk holder according to the embodiment of the present invention as viewed from the inside.

13 and 14 , the disk side cover 300 further includes an outer rotation limiting protrusion 350 .

The outer rotation limiting protrusion 350 protrudes inward from the inner surface of the outer blocking surface 320 . On the other hand, the position of the outer rotation limiting protrusion 350 may be determined according to the design of those skilled in the art, and it is to protrude shorter than the length of the outer cover cylindrical part 310 in the direction of the centrifugal extension of the disk side cover 300 . desirable.

15 is a perspective view of the main body side cover in the grinder disc holder according to an embodiment of the present invention, as viewed from the outside, and FIG. is a perspective view of a state in which the spring is seated on the main body side cover in the grinder disk holder according to an embodiment of the present invention.

15 to 17 , the main body side cover 100 has a step portion 113 , an uneven portion 117 , a recessed portion 123 , a spring seating groove 125 , a protrusion 127 , and It further includes an inner rotation limiting protrusion 150 .

The stepped portion 113 is formed such that an inner portion of the inner cover cylindrical portion 110 of the main body side cover 100 is stepped in a radially outward direction. That is, the stepped portion 113 is a portion formed inside the inner cover cylindrical portion 110 and uniformly protrudes from the outer peripheral surface of the inner cover cylindrical portion 110 along the outer periphery in the radially outward direction.

The concave-convex portion 117 is formed on the outer peripheral surface of the stepped portion 113 . In addition, the concave-convex portion 117 has a concave-convex shape in which protrusion and depression are repeated from the outer circumferential surface of the step portion 113 along the outer periphery. The shape of the concave-convex portion 117 is to facilitate relative rotation of the disk-side cover 300 and the body-side cover 100 by the operator's hand.

The depression 123 is formed on the inner surface of the inner blocking surface 120 . Here, the inner blocking surface 120 forms the protrusion 127 relatively protruding inward compared to the concave portion 123 from the outer periphery to a uniformly constant width in the radially inward direction, and the protrusion 127 . From the inner periphery of the to the radially inward direction to the through hole 130 to form a uniformly constant width compared to the protrusion 127 to form the depression 123 outwardly depressed relatively. That is, the through hole 130 may be a hole surrounded by the depression 123 .

In addition, it is apparent to those skilled in the art that the main body of the grinder to which the grinder disk holder 1 is coupled is provided with parts such as a rotating shaft cover on the rotating shaft part, and the parts around the rotating shaft are accommodated in the recessed part 123 during operation. By improving the grip and stability felt by the operator, and at the same time as the outer periphery of the protrusion 127 and the step 113 is formed widely, safety can be secured without a conventional grinder safety cover, and work performance can be improved.

The spring seating groove 125 is formed on the outer surface of the inner blocking surface 120 that is opposite to the inner surface of the inner blocking surface 120 on which the protrusion 127 is formed on the outer surface of the inner blocking surface 120 . In addition, the spring seating groove 125 has a groove shape recessed inward from the outer surface of the inner blocking surface 120 due to the step difference between the protruding portion 127 and the recessed portion 123 . That is, the spring seating groove 125 is disposed radially outside the depression 123 and is depressed along the circumferential direction. Furthermore, one end of the spring 400 is seated in the spring seating groove 125 (see FIG. 17 ). That is, the spring 400 preferably has a coil wound radius within the radius range of the spring seating groove 125 .

The inner rotation limiting protrusion 150 protrudes outward from the outer surface of the inner blocking surface 120 . On the other hand, the position of the inner rotation limiting protrusion 150 is determined according to the position of the outer rotation limiting protrusion 350 , and in the direction of the centrifugal extension of the main body side cover 100 , the inner cover cylindrical portion 110 of It is preferable to protrude shorter than the length.

In addition, the inner rotation limiting protrusion 150 limits the bidirectional rotation of the outer rotation limiting protrusion 350 to a predetermined angle when the disk side cover 300 and the main body side cover 100 are rotated relative to each other. A pair is formed. In other words, the pair of inner rotation limiting protrusions 150 are arranged to be spaced apart by a predetermined angle along the circumferential direction, and the outer rotation limiting protrusion 350 is one inner rotation limiting protrusion 150 and the other inner It is rotated so as not to deviate from a predetermined angle range between the rotation limiting projections 150 . Furthermore, the angle at which the rotation of the inner rotation limiting protrusion 150 is restricted may be 90 degrees, but is not limited thereto.

As described above, according to the embodiment of the present invention, the electric type and the air type may be compatible with the disk 600 and at the same time, it may be easy. In addition, replacement of the disk 600 can be performed quickly and safely, and processing performance can be guaranteed together with the fixing function of the disk 600 .

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and it is easily changed by a person skilled in the art from the embodiment of the present invention to equivalent Including all changes to the extent recognized as being

1: Grinder Disc Holder
100: body side cover 110: inner cover cylindrical portion
113: step portion 117: uneven portion
120: inner blocking surface 123: depression
125: spring seating groove 127: protrusion
130: through hole 150: inner rotation limiting projection
200: hub 210: hub cylindrical portion
220: bolt head seating portion 225: stepped
230: bolt thread penetration 235: female thread
240: pressure projection
300: disk side cover 310: outer cover cylindrical portion
320: outer blocking surface 330: hub insertion hole
340: locking projection 350: outer rotation limiting projection
400: spring
500: bolt 510: head portion
520: threaded part
600: disc 610: working day
640: cap 645: coupling hole
W: welding point

Claims (12)

In the grinder disc holder for detaching the disc from the grinder,
The body side cover is formed in a hollow cylindrical shape, the inner surface is partially closed;
a hub formed in a hollow cylindrical shape concentrically disposed inside the radius of the body-side cover and coupled to move integrally with the body-side cover;
a disk-side cover formed in a hollow cylindrical shape concentrically disposed outside the radius of the hub, disposed on the outside of the body-side cover so that the hub passes through, and having an outer surface partially closed; and
a spring disposed between the inner surface of the main body-side cover and the outer surface of the disk-side cover and configured to push the main body-side cover inward and simultaneously push the disk-side cover outward;
including,
The grinder disk holder, characterized in that the disk is fixed or released by pressing the disk by the outer surface of the disk-side cover and the outer end of the hub according to the selective relative rotation of the disk-side cover and the hub.
According to claim 1,
The main body side cover,
The inner cover cylindrical portion having a hollow cylindrical shape; and
an inner blocking surface for closing the inner surface of the inner cover cylindrical portion with a uniform width in a radially inward direction from the outer periphery;
includes,
The hub is
Hub cylindrical portion having a hollow cylindrical shape; and
a plurality of pressing protrusions protruding from the outer peripheral surface of the hub cylindrical part in a radially outward direction from the outer surface of the hub cylindrical part;
including,
The disk side cover,
The outer cover cylindrical portion having a hollow cylindrical shape;
an outer blocking surface for closing the outer surface of the outer cover cylindrical part with a uniform width in a radially inward direction from the outer periphery; and
a locking protrusion in which a number corresponding to the pressing protrusion protrudes outward from the outer blocking surface at the radially inner end of the outer blocking surface;
includes,
A circular through hole is formed in the distal portion of the inner blocking surface,
An inner surface of the hub cylindrical portion is coupled to the inner blocking surface so that the main body side cover and the hub move integrally,
A circular hub insertion hole into which the cylindrical hub part is inserted is formed in the distal part of the outer blocking surface, and the inner surface of the outer cover cylindrical part is disposed to surround the outer surface of the inner cover cylindrical part. .
3. The method of claim 2,
The outer diameter of the hub cylindrical portion and the inner diameter of the through hole are formed to have the same size, and one surface of the hub cylindrical portion is inserted into the through hole from the outside to the inside so that the outer circumferential surface of the hub cylindrical portion and the inner circumferential surface of the through hole are in contact with the through hole and coupled,
The grinder disk holder, characterized in that the outer peripheral surface of the inner surface of the cylindrical hub portion is welded to the inner peripheral surface of the through hole.
3. The method of claim 2,
The grinder disk holder, characterized in that the plurality of locking projections and the pressing projections are formed in a shape corresponding to when viewed in a centrifugal extension direction.
According to claim 1,
and a bolt having a head portion disposed at an outer end of the hub, and a screw portion disposed to pass through the hub cylindrical portion.
3. The method of claim 2,
When the outer surface of the locking protrusion is disposed so as to be in contact with the inner surface of the pressing protrusion and overlaps from the outside to the inside so that the locking protrusion and the pressure protrusion have the same phase based on the centrifugal force, the arrangement for mounting the disk and the detachment of the disk are possible do,
When the inner surface of the pressing protrusion moves toward the outer surface of the outer blocking surface while the locking protrusion and the pressing protrusion are radially staggered with respect to the centrifugal arrangement in the arrangement state for mounting the disk, both surfaces of the disk are the inner surface of the pressing protrusion and the Grinder disk holder, characterized in that it is mounted so that the disk is not separated by being pressed by the outer surface of the outer blocking surface.
7. The method of claim 6,
Grinder disk holder, characterized in that when each of the pressing protrusion and the locking protrusion is formed in n number, it is formed to have a thickness surrounding an arc having a circumference of 1/2n along the circumference of the hub cylindrical portion and the hub insertion hole, respectively.
5. The method of claim 4,
The disk forms a working blade from the outer periphery to a uniformly uniform width in the radially inward direction, and forms a cap around the centrifugal circumference in the radially inward direction of the working blade,
Grinder disk holder, characterized in that when the hub is viewed in the centrifugal extension direction, a coupling hole having a shape corresponding to the circumferential shape of the outer surface of the hub cylindrical portion on which the pressing protrusion is formed is perforated around the distal circumference of the cap.
3. The method of claim 2,
The hub is
a bolt head seating part that is a section formed outside the hollow to prevent the head part of the bolt from being seated to prevent the head part from protruding to the outside when a bolt for fastening with the grinder's rotation shaft is provided;
Steps formed to be stepped in a radially inward direction from the inner diameter of the bolt head seating portion so that the head portion having a larger outer diameter than the screw portion of the bolt is caught; and
a bolt screw penetrating portion that is a section formed on the inside of the hollow with the step as a boundary so that the screw portion is disposed while passing therethrough;
Grinder disk holder, characterized in that it further comprises.
3. The method of claim 2,
The disk side cover,
Further comprising an outer rotation limiting projection protruding inward from the inner surface of the outer blocking surface,
The main body side cover,
a step portion uniformly protruding radially outward from an outer peripheral surface of the inner cover cylindrical portion from the inside of the inner cover cylindrical portion;
a concave-convex portion formed in a concave-convex shape along the outer periphery from the outer circumferential surface of the step portion; and
an inner rotation limiting protrusion protruding outward from the outer surface of the inner blocking surface to limit the bidirectional rotation of the outer rotation limiting protrusion to a predetermined angle when the disk side cover and the main body side cover rotate relative to each other;
Grinder disk holder, characterized in that it further comprises.
11. The method of claim 10,
Grinder disk holder, characterized in that the pair of inner rotation limiting projections are arranged to be spaced apart by a predetermined angle along the circumferential direction so that the outer rotation limiting projection rotates at a limited angle therebetween.
11. The method of claim 10,
The main body side cover,
a protrusion formed from the outer periphery to a uniformly uniform width in the radially inward direction on the inner blocking surface;
a concave portion that has a uniformly constant width from the inner periphery of the protrusion to the through hole in a radially inward direction, and is depressed relatively outwardly compared to the protrusion; and
a spring seating groove formed to be depressed inwardly from the outer surface of the inner blocking surface on the opposite surface of the protrusion from the outer surface of the inner blocking surface according to the step shape of the protrusion and the recessed portion;
further comprising,
Grinder disk holder, characterized in that the inner end of the spring is seated in the spring seating groove.

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