KR102528790B1 - Coupler assembly for grinder - Google Patents

Abstract

The present invention relates to a coupler assembly for a grinder configured to more simply and quickly detach and attach a disc wheel that is bound on a rotating shaft of a grinder body and used for finishing, cutting, or cutting the surface of a work object. .
The present invention consists of a housing, upper and lower fastening pieces inserted and fixed to the outer circumferential surface of the housing, and a spring and a rotating plate interposed between the upper and lower fastening pieces to impart elasticity, and the housing includes At the same time as the inner diameter mounted on the rotating shaft of the grinder body is penetrated, locking jaws and locking protrusions are formed on the upper and lower ends of the outer circumference of the cylindrical body, and long grooves facing each other are formed on the outer side of the through hole on the upper fastening piece, so that the housing At the same time that the locking protrusions are inserted and assembled, a flange having a female screw portion is formed on the disk-shaped body of the lower fastening piece to be fastened to the inner diameter of the housing, and a protruding column is formed on the pivot plate to be inserted into the upper fastening piece and assembled, and the housing is caught at the same time. In the process of mounting the disc wheel into the jaw, it is configured to be elastically raised and lowered by a spring to apply a pressing force.

Description

Coupler assembly for grinder {Coupler assembly for grinder}

The present invention is a coupler for a grinder configured to more simply and quickly detach and attach a disk wheel that 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 assembly.

As is well known, a normal 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 steel plates.

That is, the grinder operates the rotating shaft at high speed by air pressure generated by electric motor driving or operation of the compressor, and at the same time grinds the surface of the object using a consumable disc wheel to grind the unprocessed part, corner, etc. Carrying out or cutting work.

In the case of the disc wheel, since the grinding stone or sandpaper is attached to the workpiece surface and easily consumed, the operator has to replace it from time to time while carrying a large number of disc wheels. Accordingly, the disc wheel can be easily detached and attached to the grinder form is being improved.

As a structure for mounting the disc wheel in such a grinder, as in Korean Utility Model Publication No. 1989-10365 or No. 1996-26826, the disc wheel is inserted and fixed to the rotating shaft mounted in the grinder body, and then the nut is tightened. A method is used to fix the disc wheel by using a bolt or by fastening a bolt to the rotation shaft to fix the disc wheel.

Therefore, in this structure, as the disc wheel is simply fastened to the grinder body with bolts or nuts, the frictional force of the high-speed rotating disc wheel or the fine vibration decreases the fastening force, causing psychological anxiety to the operator. A separate cover is installed around the disc wheel in preparation for causing a safety accident by unwinding the disc wheel on the way.

In addition, in Publication No. 2009-0074461, the disc wheel is prevented from being released by allowing the holder integrally mounted on the disc wheel to be bound by screwing through a fixed holder on the rotating shaft of the grinder body. In addition, there is disclosed a technology that allows the disc wheel to be detached and attached more easily and quickly through a brake unit installed on the grinder body.

In this structure, since the disk holder must be fastened to the fixed holder on the rotating shaft by fastening screws, it is inconvenient to unscrew or re-fasten the disk holder during work, as well as operate a separate brake unit, which significantly affects the operator. that was uncomfortable.

Utility Model Publication No. 1989-10365 (published on July 8, 1989) - Disk type sandpaper for hand grinder. Public Utility Model No. 1996-26826 (published on August 17, 1996) - Safety pad for hand grinder. Publication Patent Publication No. 2009-0074461 (published on July 7, 2009) - Abrasive disc attachment and detachment device for hand grinder.

The present invention is to solve the above conventional problems, and an object of the present invention is to manufacture a coupler mounted on a rotating shaft of a grinder body in a simple structure so that a disc wheel can be easily detached and attached in a one-touch manner, It is to provide a coupler assembly for a grinder that can improve work efficiency at a cost.

In addition, an object of the present invention is to provide a coupler assembly for a grinder that can work safely by enabling the disc wheel to be more reliably bound by the pressing force acting in the process of mounting the disc wheel to the coupler.

The present invention for achieving this object is a housing, upper and lower fastening pieces fitted and fixed to the outer circumferential surface of the housing, and a spring and a rotating plate interposed between the upper and lower fastening pieces to impart elasticity. In the housing, the inner diameter portion mounted on the rotating shaft of the grinder body penetrates, and at the same time, locking jaws and locking protrusions are formed on the upper and lower ends of the outer circumference of the cylindrical body, and the upper fastening piece faces each other outwardly of the through hole. A long groove is formed to insert and assemble the locking protrusions of the housing, and at the same time, a flange having a female screw portion is formed on the disk-shaped body of the lower fastening piece to be fastened to the inner diameter of the housing, and a protruding column is formed on the pivot plate to attach to the upper fastening piece. At the same time as being inserted and assembled, the disc wheel is configured to be elastically raised and lowered by a spring to apply a pressing force in the process of mounting the disc wheel into the locking jaw of the housing.

In addition, a concave groove having an inclined surface is formed on the inner surface of the rim of the upper fastening piece, and an external protrusion having a corresponding inclined surface is formed on the rotating plate so that the disk wheel can be moved up and down elastically during attachment and detachment. .

In addition, protruding rods and concave grooves are alternately formed on the inner diameter portion formed on the rotating plate at intervals of 90° with respect to the center, so that the locking protrusions of the housing are assembled through the long grooves of the upper fastening piece.

Due to the above-described features, 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, and easily remove the consumable disc wheel from the coupler in a one-touch manner, Since it is attached, it is possible to quickly perform replacement work during work, greatly improving efficiency.

In addition, since the binding force of the disc wheel can be strengthened more reliably by increasing the pressing force acting on the housing side when the disc wheel is mounted, the disc wheel rotating at high speed is not separated during work and causes a safety accident as in the past. that can do the work.

1 is an exploded perspective view for explaining a coupler assembly for a grinder according to the present invention;
Figure 2 is a perspective view showing the components of the coupler separated;
3a and 3b are plan and cross-sectional views of the housing;
Figure 4a, Figure 4b is a plan view and cross-sectional view of the upper fastening piece,
5a and 5b are plan and cross-sectional views of the lower fastening piece;
6a and 6b are plan views and cross-sectional views of the rotating plate;
7 is a partial configuration diagram showing the interaction relationship between the concave groove formed on the upper fastening piece and the outer projection formed on the rotating plate;
8 is a main cross-sectional view of a state in which each component is mounted on the grinder body.

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

1 to 8 are views for explaining the coupler assembly for a grinder according to the present invention, the coupler (K) in the present invention is on the housing 30 and the outer circumferential surface of the housing 30, respectively. It consists of upper and lower fastening pieces 40A and 40B that are fitted and fixed, and a spring 50 and a rotation plate 60 interposed between the upper and lower fastening pieces 40A and 40B to impart elasticity.

The coupler (K) is installed on one side of the front end of the grinder body 20 and is detached from and attached to the rotary shaft 21 rotating at high speed.

In the housing 30, an inner diameter portion 31 having a screw thread is penetrated so as to be screwable to the rotation shaft 21 of the grinder body 20, and four locking jaws 32a are formed on the upper and lower ends of the outer circumference of the cylindrical body. ) and locking protrusions 32b, respectively, are formed with male screw portions 33.

In the case of the locking jaw 32a, it is preferable to form an inclined surface to one side of the lower end so that it can be easily inserted when the disk wheel 70 is mounted.

In addition, the upper fastening piece 40A has four long grooves 41b into which the locking protrusions 32b of the housing 30 are fitted to the outside of the through hole 41a, and at the same time, the outer periphery rim portion ( 42) protrudes, and four concave grooves 43b having inclined surfaces 43a are formed on the inner surface of the rim portion 42 at intervals of 90°.

The lower fastening piece 40B has a flange 45a having a female screw portion 45b protruding from the central portion of the disc-shaped body 44a so as to be fastened to the male screw portion 33 of the housing 30, and on the outer periphery By forming the rim portion 44b, the spring 50 is interposed between the upper and lower fastening pieces 40A and 40B.

In the case of this spring 50, although shown as a coil spring having an inclined surface due to a difference in diameter in the present invention, it is of course possible to apply a general leaf spring.

The pivoting plate 60 is interposed between the upper and lower fastening pieces 40A and 40B and elastically moves up and down in the process of mounting the disk wheel 70 into the locking jaw 32a of the housing 30 to apply pressing force. It is structured so that it can be given.

That is, four outer protrusions 61b having inclined surfaces 61a are formed on the outer edge of the rotating plate 60 at intervals of 90°, and four outer projections 61b formed on the inner surface of the edge portion 42 of the upper fastening piece 40A are formed. By interacting with the inclined surface 43a and the concave groove 43b, the rotating plate 60 can be raised and lowered.

In addition, protruding pillars 62a and grooves 62b are alternately formed on the inner diameter portion formed on the pivot plate 60 at intervals of 90° with respect to the center, and are inserted into the long grooves 41b of the upper fastening piece 40A. At the same time, the locking protrusion 32b of the housing 30 is inserted and assembled.

In the case of the protruding pillar 62a, as the inclined surface 63a is formed at the upper front end, it adheres to the bottom surface of the disc wheel 70.

On the other hand, the disk wheel 70 mounted on the coupler (K) in the present invention is a consumable to be disposed of when its lifespan is over due to long-time use, and a disk-shaped processing unit (71a) for grinding or cutting a normal work object ), and a holder portion 71b for binding the processed portion 71a.

In addition, four protruding pieces 72 are formed on the inside of the holder portion 71b to correspond to the locking protrusions 32a formed on the housing 30, and it is possible to attach and detach the coupler K.

With this configuration, in a state where the inner diameter portion 31 of the housing 30 constituting the coupler K is fixed to the rotating shaft 21 of the grinder body 20 by screw fitting, the protruding piece of the disc wheel 70 ( 72) is inserted into the protruding portion 32b of the housing 30, and the disk wheel 70 is slightly rotated to be fixed by the locking jaw 32a.

At this time, the upper fastening piece 40A is pressed downward while receiving elasticity by the spring 50 interposed between the lower fastening piece 40B and then restored again, and simultaneously with the rotation of the disc wheel 70 The disk wheel 70 can be firmly maintained while the rotating plate 60 also moves upward.

That is, the locking protrusion 32b of the housing 30 is assembled into the groove 62b of the rotating plate 60 through the long groove 41b of the upper fastening piece 40A, and at the same time the rotating plate 60 Since the protruding pillars 62a of ) are assembled, it is possible to move only within the range of the long groove 41b when the disc wheel 70 is mounted, and on the inner surface of the rim 44 of the upper fastening piece 40A. The rotational plate 60 is raised by the interaction of the formed concave groove 43b and the inclined surfaces 43a and 61a of the outer protrusion 61b formed on the outer circumferential surface of the rotational plate 60, thereby moving the disc wheel 70. It becomes possible to pressurize the bottom face part.

Therefore, by operating the rotating shaft 21 of the grinder main body 20 and at the same time by the high-speed rotation of the disk wheel 70, work such as grinding or cutting the unprocessed part or corner of the object can be performed.

In addition, when replacing the disk wheel 70, the disk wheel 70 is released from the locking jaw 32a formed in the housing 30 by slightly rotating it in the opposite direction while pushing the disk wheel 70, so that the disk wheel 70 can be easily removed. be able to

As described above, according to the coupler assembly for a grinder according to the present invention, 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 the consumable disk wheel can be attached to the coupler in a one-touch method. Since it is designed to be easily attached and detached, it is possible to quickly perform replacement work during work and greatly improve efficiency.

In addition, since the binding force of the disc wheel can be strengthened more reliably by increasing the pressing force acting on the housing side when the disc wheel is mounted, the disc wheel rotating at high speed is not separated during work and causes a safety accident as in the past. that can do the work.

The technical problem of the present invention is achieved by the technical configuration as described above, and although it has been described by the limited embodiments and drawings, it is not limited thereto, and the technical idea of the present invention by a person skilled in the art to which the present invention belongs Of course, various modifications and variations are possible within the scope of equivalence of the claims to be described below.

20: grinder body 21: rotation shaft
30: housing 31: inner diameter
32a: snag 32b: snag
33: male screw part 40A: upper fastening piece
40B: lower fastening piece 41a: through hole
41b: long groove 42: rim
43a: inclined surface 43b: concave groove
44a: disk-shaped body 44b: rim portion
45a: flange 45b: female thread
50: coil spring 60: rotating plate
61a: inclined surface 61b: lateral projection
62a: protruding column 62b: groove
63a: slope 70: disc wheel
71a: processing part 71b: holder part
72: overhang

Claims (3)

The housing 30, the upper and lower fastening pieces 40A and 40B which are inserted and fixed to the outer circumferential surface of the housing, and a spring 50 interposed between the upper and lower fastening pieces to impart elasticity, and a rotation It is made of copper plate 60,
In the housing 30, the inner diameter portion 31 mounted on the rotating shaft 21 of the grinder body penetrates, and at the same time, a locking jaw 32a and a locking protrusion 32b are formed at the upper and lower ends of the outer circumference of the cylindrical body, respectively. ,
In the upper fastening piece 40A, long grooves 41b facing each other are formed on the outside of the through hole 41a, so that the locking protrusions of the housing are fitted and assembled, and at the same time, the inner diameter portion of the housing is formed in the disc-shaped body of the lower fastening piece 40B. A flange 45a having a female screw portion 45b is formed to be fastened to,
A protruding column is formed on the rotating plate 60, and is assembled by being inserted into the upper fastening piece, and at the same time, in the process of mounting the disc wheel into the locking jaw of the housing, the spring 50 moves up and down elastically to apply a pressing force. A concave groove 43b having an inclined surface 43a is formed on the inner surface of the edge portion of the upper fastening piece 40A, and an outer projection 61b having an inclined surface 61a corresponding thereto is formed on the rotating plate 60. and protruding rods 62a and grooves 62b are alternately formed on the inner diameter formed on the pivot plate 60 at intervals of 90° from the center, so that the locking protrusion of the housing 30 is the upper fastening piece 40A Coupler assembly for a grinder, characterized in that configured to be assembled through the groove of the. delete delete

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