KR200493410Y1 - Coupler structure for hand grinder - Google Patents

Abstract

The present invention is a coupler of a hand grinder configured to allow simpler and quicker detachment and attachment of a processing disk, which is bound on the rotating shaft of the grinder body and used for finishing, cutting, or cutting the surface of a work object. It's about the structure.
The present invention is a housing that is detachable and attached to a rotating shaft mounted on one end of the grinder body, an upper and lower fastener that is fitted and fixed to the outer circumference of the housing, and is interposed between the upper and lower fasteners to provide elasticity. Consisting of a spring for imparting and a snap ring for holding the upper and lower fastening pieces to the housing, and the housing is inserted into the rotation shaft of the grinder body and fixed to the inner diameter portion penetrates and at the same time, a protrusion having a locking jaw around the outer circumference of the cylindrical body Is formed, the upper fastening piece has a groove formed outside the through hole and is fitted into the protrusion of the housing to be assembled, and at the same time, the lower fastening piece has a through hole that is fitted into the body of the housing.
Accordingly, the manufacturing cost can be greatly reduced by simply configuring the interlocking parts of the coupler mounted on the rotating shaft of the grinder body, and since the consumable disks are easily detached and attached to this coupler in a one-touch method, replacement work at the time of work is avoided. It can be done quickly and the efficiency can be greatly improved.

Description

Coupler structure for hand grinder

The present invention is a coupler of a hand grinder configured to allow simpler and quicker detachment and attachment of a processing disk, which is bound on the rotating shaft of the grinder body and used for finishing, cutting, or cutting the surface of a work object. It's about the structure.

As is well known, a conventional hand grinder is used for smoothing a rough surface of a processed part or a part to be painted, or for partially cutting raw materials such as pipes, angles, and iron plates.

That is, the hand grinder operates the rotating shaft at high speed by the electric motor drive or the air pressure generated by the operation of the compressor, while grinding the surface of the object using a consumable disk to grind unprocessed parts and corners. You will do the work of cutting out or cutting.

In the case of the disk, since grinding stone or sandpaper is easily consumed as it is attached to the surface to be processed, it must be replaced at any time while a large amount of disk is provided, and accordingly, the disk has been improved in a form in which the disk can be easily detached and attached.

As a structure for mounting a disk in such a hand grinder, as in Korean Public Utility Model No. 1989-10365 or 1996-26826, the disk is inserted into the rotating shaft mounted in the grinder body, and then a nut is used. It is fixed or bolted to the rotating shaft so that the disk is fixed.

Therefore, in this structure, as the disk is simply fastened to the grinder body by bolts or nuts, the fastening force of the disk rotating at high speed decreases due to the frictional force or micro-vibration, causing psychological anxiety to the worker. It is a situation in which a separate cover is installed around the disk in preparation for causing a safety accident due to the release of the product.

In addition, Korean Patent Publication No. 2009-0074461 discloses that a disk-integrated disk holder can be screwed together through a fixing holder on the rotating shaft of the grinder body, thereby preventing the disk from loosening from the fixing holder. In addition, there is disclosed a technology that enables easier and quicker removal and attachment of a disk through a brake unit installed in a grinder body.

In this structure, since the disk holder must be screwed into the fixed holder on the rotating shaft, there is a hassle of unscrewing or re-fastening the disk holder during work, as well as the need to operate a separate brake unit. It was to be uncomfortable.

Public Utility Model No. 1989-10365 (released on July 8, 1989)-Disc-type sandpaper for hand grinders. Public Utility Model No. 1996-26826 (published on August 17, 1996)-Safety pad for hand grinder. Patent Publication No. 2009-0074461 (published on July 7, 2009)-A device for attaching and detaching an abrasive disk for a hand grinder.

The present invention is to solve the conventional problems as described above, and the object of the present invention is to make the coupler mounted on the rotating shaft of the grinder body in a simple structure so that the disk can be easily detached and attached in a one-touch manner, thereby reducing cost. It is to provide a coupler structure of a hand grinder that can improve work efficiency.

The present invention for achieving this purpose is a housing that is detachable and attached to a rotating shaft mounted on one end of the grinder body, an upper and lower fastening piece that is fitted and fixed to the outer circumference of the housing, respectively, and the upper and lower parts thereof. It is made of a spring interposed between the fastening pieces to impart elasticity, and the housing has an inner diameter part that is fitted and fixed to the rotating shaft of the grinder body, and four protrusions having respective locking protrusions around the outer circumference of the cylindrical body face each other. At the same time, a male thread is formed around the outer circumference of the body located at the lower tip of the protrusion, and the upper fastening piece is formed with four grooves from the central through hole toward the outside. Each inserted and assembled, and at the same time, the outer circumference is formed, and the disk-shaped body constituting the lower fastening piece has a flange having a female thread protruding to be fastened to the male thread of the housing, and the spring is the outer edge of the upper fastening piece. It is configured to be accommodated between the outer circumferential edge portion formed in and the outer circumference of the flange formed on the disk-shaped body of the lower fastening piece.

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The present invention can greatly reduce the manufacturing cost by simply configuring the interlocking parts of the coupler mounted on the rotating shaft of the grinder body by the above-described features, and the consumable disk can be easily detached and attached to this coupler in a one-touch method. Therefore, it is possible to greatly improve the efficiency by performing the replacement work at the time of work quickly.

1 is a perspective view showing a separate component of a hand grinder disclosed in Patent Registration No. 0973157;
Figure 2 is a side view showing the configuration of each component in the assembled state;
3A and 3B are a cross-sectional view of a disk holder and a bottom view of a portion "A";
Figure 4 is a perspective view of the separated state of each component constituting the power linking unit,
5A and 5B are cross-sectional views illustrating the components of FIG. 4 in an assembled state;
6A and 6B are plan configuration diagrams for explaining an operation relationship between a stopper and a safety pin constituting a power linkage unit;
7A and 7B are plan and bottom views of a housing constituting a power linkage unit,
8 is an exploded perspective view for explaining the coupler structure of the hand grinder according to the present invention,
9 is a perspective view showing the components of the coupler separated;
10A and 10B are a plan view and a cross-sectional view of a housing;
11A and 11B are plan and cross-sectional views of an upper fastening piece,
12A and 12B are plan and cross-sectional views of a lower fastening piece,
13 is a cross-sectional configuration diagram of a state mounted on the grinder body.

Hereinafter, preferred embodiments according to the present invention will be described in more detail with reference to the accompanying drawings, but specific structures and functions thereof are not limited to the embodiments described in the present specification since they represent one configuration example.

First, as a preferred example to which the present invention is applied, the technology disclosed in Patent No. 0973157 will be described in detail, and after deriving the problems according to the present invention, the configuration and effects of the present invention will be described later.

As shown in the accompanying Figures 1 to 7B, the hand grinder consists of a disk holder 30 in which a power linking unit 20 and a disk D are integrally mounted, including a conventional grinder body 10. have.

One end of the grinder body 10 is provided with a rotating shaft 11 having a screw hole 11a so as to rotate at high speed by electric motor driving or air pressure due to the operation of the compressor, and on the rotating shaft 11 The power linkage unit 20 and the disk holder 30 are mounted.

A plurality of grooves 32 are formed on the bottom of the through hole 31 of the disk holder 30 at regular intervals, and three protruding pieces 33 are formed between the grooves 32 to form a power linking unit ( 20) It is constructed so that it can be mounted on or removed.

In addition, the power linkage unit 20 includes a stopper 40 and a housing 50 that rotates forward and backward on the stopper 40, and a cylindrical binding member 60 at the center of the housing 50 Is mounted and fastened to the rotation shaft 11 of the grinder body 10 as a fixing bolt 12.

On both sides of the through-hole 41 formed in the central portion of the stopper 40, spiral-shaped receiving grooves 42a and 42b gradually moving away from the center of the through-hole 41 are formed, and the receiving grooves 42a and 42b are Concave holes 43a and 43b facing each other are formed therebetween.

In addition, the circumferential surface of the stopper 40 has an uneven portion 44 for preventing slipping, and an alignment line 44a is formed between the uneven portion 44, and the receiving groove 42a, In 42b), a safety key 46 made of a cylindrical roll 45a and a square pole 45b is mounted, respectively.

The housing 50 is for performing a function of locking or releasing the disk holder 30 by operating the safety key 46 on the stopper 40 in a horizontal direction, and the through hole of the flange 51 and the stopper 40 It consists of a body 52 that is fitted into (41).

In addition, an alignment line 51a is formed on one side of the circumferential surface of the flange 51, and at the same time, a rectangular guide groove 53 facing each other is formed on the bottom surface of the flange 51, so that the square pole 45b at the top of the safety key 46 Each of these is fitted and assembled.

An insertion groove 54 is formed in the body 52 at the lower end of the flange 51 to bind the housing 50 assembled into the through hole 41 of the stopper 40 by a fixing ring 55, and the Ball bronzers 56 are provided on both sides of the upper surface of the flange 51 so that the housing 50 can be rotated closely on the stopper 40.

The ball bronzer 56 is configured by inserting the steel ball 57 and the spring 58 into the insertion holes 51b formed on both sides of the upper surface of the flange 51 and then fastening it with a fixing screw 59, and the housing At the time of the forward and reverse rotation of 50, it is able to be elastically fitted into or out of the recessed holes 43a and 43b formed in the stopper 40.

In addition, a stepped step 61 is formed in the binding member 60 fastened on the rotation shaft 11 of the grinder body 10 while being assembled with the mounting hole 51c formed in the central portion of the housing 50, The upper side of the stepped 61 is configured to be fixed or detachable by inserting the protruding piece 33 of the disk holder 30 as three a-shaped locking projections 62 are formed.

However, in the prior art as described above, the disk holder 30 can be easily attached and detached on the rotation shaft of the grinder body 10, but a separate stopper 40 or a housing constituting the power linking unit 20 (50) or safety key (46), the steel ball (57), the spring (58), the fixing screw (59) constituting the ball bronzer (56) is a complex installation structure, which increases the manufacturing cost As a result, it becomes a considerable burden in the workplace where a large amount of consumables are used.

In addition, there is a risk that the operation of the safety key may be poor due to foreign substances such as fine particles generated during work such as grinding or cutting using a hand grinder, as well as a cause of failure.

On the other hand, the accompanying Figures 8 to 13 are views for explaining the coupler structure of the hand grinder according to the present invention.

As shown in these drawings, the coupler (K) detachable and attached to the rotation shaft 11 of the grinder body 10 is a housing 70 and a phase fixed by being fitted to the outer circumferential surface of the housing 70, respectively. , Consisting of a lower fastening piece (80A, 80B) and a spring 90 interposed between the upper and lower fastening pieces (80A, 80B) to give elasticity.

In the housing 70, an inner diameter portion 71 having a thread is penetrated to enable screw fit to the rotation shaft 11 of the grinder body 10, and four locking projections 72a are formed in the cylindrical body at the upper end. At the same time as the protrusion 73 is formed, a male screw portion 74 is formed outside the lower end.

In addition, the upper fastening piece (80A) is formed with four grooves 82 into which the protrusions 73 of the housing 70 are fitted to the outside of the through hole 81a, and at the same time, the outer peripheral edge portion 83a is formed at the outer edge. ) Is formed to protrude, and the lower fastening piece 80B has a flange 85b having a female threaded portion 85a at the central portion of the disk-shaped body 84 so that it is fastened to the male threaded portion 74 of the housing 70. Has been.

Accordingly, it is possible to accommodate the spring 90 in the upper and lower fastening pieces 80A and 80B, and each component can be stored in a state in which the upper and lower fastening pieces 80A and 80B are respectively mounted on the housing 70. By holding it, it becomes possible to attach and detach the disk 100 in a one-touch manner.

That is, the disk 100 is a consumable that is disposed of when its service life is over due to long-term use, and includes a disk-shaped processing unit 101 for grinding or cutting a normal work object and binding the processing unit 101 It is provided with a holder part 102 for making it possible to attach and detach it to the housing 70 as the protruding pieces 103 are formed inside the holder part 102.

With this configuration, it is possible to fix the inner diameter portion 71 of the housing 70 forming the coupler K to the rotation shaft 11 of the grinder body 10 by screwing, and in this state, the disk 100 The grooves formed by the protruding pieces 103 of the housing 70 are inserted into the protruding portions 73 of the housing 70 and are fixed by the locking projections 72a of the protruding portions 73 as the disk 100 is slightly rotated.

At this time, the upper fastening piece 80A is pressed to the lower side while receiving elasticity by the spring 90 interposed between the lower fastening piece 80B, and then restored, and the disk 100 can be firmly maintained. .

Therefore, the part where the object is less processed due to the high-speed rotation of the disk 100 while simultaneously operating the rotating shaft 11 of the grinder body 10 at high speed by the air pressure generated by the electric motor drive or the operation of the compressor. It is possible to grind or cut corners, etc.

In addition, when the disk 100 is to be replaced, the disk 100 is released from the locking projection 72a formed on the protrusion 73 of the housing 70 by slightly rotating the disk 100 in the opposite direction while pushing the disk 100. It is removable, and in the case of the spring 90, it is sufficiently possible to replace it with silicon or other elastic material.

As described above, according to the coupler structure of the hand grinder according to the present invention, it is possible to greatly reduce the manufacturing cost by simply configuring the interlocking parts of the coupler mounted on the rotating shaft of the grinder body, and a consumable disk in the coupler is a one-touch method. Since it is easily detached and attached, the efficiency can be greatly improved by quickly performing replacement work during work.

The technical task of the present invention is achieved by the technical configuration as described above, and although it has been described by a limited embodiment and drawings, the present invention is not limited thereto, and the present invention by a person having ordinary knowledge in the technical field to which the present invention belongs. It goes without saying that various modifications and variations are possible within the scope of the technical idea of and the claims to be described below.

70: housing 71: inner diameter portion
72a: locking jaw 73: protrusion
74: male thread 80A: upper fastening piece
80B: lower fastening piece 81a: through hole
82: groove 83a: rim portion
84: disk-shaped body 85a: female thread
85b: flange 90: spring

Claims (3)

The housing 70 that is detachably attached to the rotating shaft mounted on one end of the grinder body, the upper and lower fastening pieces 80A and 80B that are respectively fitted and fixed to the outer circumference of the housing, and the upper and lower fastening pieces. It is made of a spring (90) for imparting elasticity is interposed between,
In the housing 70, an inner diameter portion 71 that is fitted and fixed to the rotation shaft of the grinder body is passed through, and four protrusions 73 having respective locking projections 72a around the outer circumference of the cylindrical body are perpendicular to each other at a position opposite to each other. At the same time, a male screw portion 74 is formed around the outer periphery of the body located at the lower tip of the protrusion at the same time,
The upper fastening piece 80A has four grooves 82 formed outwardly from the through hole 81a in the center, and is inserted into the protrusion 73 of the housing 70 and assembled, and at the same time, the outer circumference of the frame 83a ) Is formed,
The disk-shaped body 84 constituting the lower fastening piece 80B has a flange 85b having a female threaded portion 85a protruding so as to be fastened to the male threaded portion 74 of the housing 70,
The spring 90 is accommodated between the outer circumferential edge portion 83a formed on the outer edge of the upper fastening piece 80A and the outer circumference of the flange 85b formed on the disk-shaped body 84 of the lower fastening piece 80B. A coupler structure of a hand grinder, characterized in that it is configured so as to be. delete delete

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