KR200373648Y1 - polishing holder structure for hand grinder - Google Patents

Abstract

The present invention relates to a polishing holder detachment structure of a hand grinder which allows the polishing holder to be easily detached in a one-touch manner by a sleeve mounted to resiliently slide on a circumferential surface of a coupling fastened to a rotary shaft of a grinder body. .

The present invention has an abrasive holder having an abrasive for processing an object on one side and an insertion rod having a groove on the other side thereof, and a seating portion for accommodating the insertion rod of the abrasive holder and being fastened to the rotary shaft of the grinder body. A coupling provided with a threaded hole, a sleeve mounted to resiliently slide on the circumferential surface of the coupling, and the polishing holder being caught in a through hole formed at the center of the coupling according to the movement of the sleeve, It consists of a locking ball arranged to be released.

Description

Polishing holder structure for hand grinder

The present invention relates to a hand grinder, and more particularly, the one-touch method of detaching and polishing the polishing holder by a sleeve mounted to resiliently slide on the circumferential surface of the coupling fastened to the rotary shaft of the grinder body. It relates to a polishing holder detachable structure of a hand grinder.

As is well known, conventional hand grinders are equipped with abrasives on a rotating shaft that operates at high speed by motor driving or air pressure of a compressor, thereby polishing the surface of an object made of wood, stone, or various metals. It is a kind of power tool used for finishing work by grinding polished or less processed parts and corners.

In general, the abrasive is manufactured in various shapes and forms according to the material or size of the object to be processed, and is composed of a single piece by integrating the abrasive holder, and the abrasive holder is exposed from the grinder body. It can be mounted on a rotating shaft and used

Regarding the abrasive, various types of brushes such as those disclosed in Korean Utility Model Registration No. 240165 or 357171 can be exemplified.

In addition, as a structure for fastening the holder equipped with the abrasive to the rotary shaft of the hand grinder, for example, a collet (collet) as in the Korean Utility Model Publication No. 1990-0007807 or the Utility Model Publication No. 1999-0016720 A technique for mounting a grinding wheel by using a grinding wheel or using a chucking device is disclosed, but in this case, there is a problem in that the structure itself becomes complicated and the manufacturing cost increases considerably.

In addition, the technique disclosed in Korean Utility Model Registration No. 0356304 adopts a general configuration in which a head on which an abrasive plate is mounted is inserted into a rotating shaft of a grinder and fixed or detached by a fastening member such as a fixing nut. In addition, this also has the trouble of repeating the process of tightening or releasing the fixing nut by using a separate tool such as a spanner, as well as unnecessary factors due to the replacement work, which causes the efficiency to be reduced.

In addition, there is a possibility that the abrasive is removed while the fixing nut is loosened by vibration or external force generated during the polishing operation, and there is a risk of a safety accident due to a malfunction in the process of replacing the abrasive.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to make it easy to detach the polishing holder mounted on the rotary shaft of the grinder body in one-touch manner, so that a separate tool or fastening is possible. The present invention provides a grinding holder detachable structure of a hand grinder which can not only require a means but also can easily and easily change the abrasive, thereby greatly improving work efficiency.

In addition, another object of the present invention is that the grinding operation can be performed in a state in which the rotation axis of the grinder body and the coupling and the center of the polishing holder mounted on the coupling coincide with each other, thereby minimizing vibrations generated during the work process. The present invention provides a grinding holder detachable structure of a hand grinder that can reduce fatigue and prevent the occurrence of safety accidents.

1 is a perspective view separately showing each component to explain the removal and removal structure of the grinding wheel of the hand grinder according to the present invention,

2a and 2b is a partial cross-sectional view for explaining the detachment state of the polishing holder shown in FIG.

3a and 3b is a partial cross-sectional view showing the interaction between the coupling and the sleeve and the locking ball shown in FIG.

4A and 4B are views of detachable portions of the polishing holder and the coupling as viewed from each side.

* Description of the symbols for the main parts of the drawings *

10: abrasive 11: abrasive holder

11a: slope 12: grinder body

13: shaft 14: coupling

14a: body 15: sleeve

15a: protrusion 16: rocking ball

17: retaining ring 18: insertion rod

18a: groove 19a, 19b, 19c: bump

20: seating portion 21: recessed groove

22: through hole 23a, 23b, 23c: fixing groove

24: screwer 25: bush

26a: step 26b: slope

27: protrusion 28: elastic spring

29: Communist

The present invention for achieving the object as described above, the polishing holder is provided with an abrasive for processing the object on one side and the insertion rod having a groove on the other side, and a seating portion for accommodating the insertion rod of the polishing holder A coupling having threaded holes which are fastened to the rotary shaft of the grinder body, and a sleeve mounted to resiliently slide on the circumferential surface of the coupling, and at the center of the coupling according to the movement of the sleeve. It is characterized by consisting of a locking ball that is arranged to engage and release the polishing holder while haunting toward the formed through hole.

Here, a recess groove is formed inside the seating portion of the coupling, and at the same time, three fixing grooves are provided at the tip of the through hole successive from the recess groove, and the fixing groove is formed on the circumference of the rod of the polishing holder. It is characterized in that the three locking projections are configured to be fitted.

In addition, a protruding portion having a stepped portion and an inclined surface is formed at one side of the inner diameter portion of the sleeve to regulate the position of the locking ball, and an elastic spring is interposed between the stepped portion and the coupling of the protruding portion.

In addition, the locking ball is accommodated in each of the three communicating holes formed on the same circumference of one side of the body constituting the coupling, and at the same time when the slide movement of the sleeve can be released to the through-hole side of the coupling center to remove the polishing holder. It is characterized in that it is configured to.

The present invention allows the polishing holder mounted on the rotary shaft of the grinder main body to be detached and detached more conveniently in a one-touch manner without the need for a separate tool or fastening means. The polishing operation can be performed in the state where the center of the ring and the polishing holder mounted on the coupling are matched, thereby reducing the fatigue of the operator and preventing the occurrence of a safety accident.

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

1 to 4a and 4b is a view for explaining the removal and removal structure of the grinding wheel of the hand grinder according to the present invention, as shown in these drawings, the main components of the present invention are various types of abrasives according to the processing object ( A polishing holder 11 to which the 10 is mounted, a coupling 14 accommodating the polishing holder 11 and attached to the rotary shaft 13 of the grinder main body 12, and the coupling 14 A sleeve 15 is assembled to resiliently slide on a circumferential surface, and a locking ball 16 that is operated by the sleeve 15 to detach the polishing holder 11 in a one-touch manner.

The polishing holder 11 is integrally mounted to one side of the body through the fixing ring 17, the abrasive 10 for the processing of the object, the cylindrical insertion rod 18 having a groove 18a at the other end At the same time, three locking projections (19a, 19b, 19c) are formed between the inclined surface (11a) and the insertion rod (18) of the polishing holder (11).

As can be seen in each figure, the abrasive 10 is shown to be produced in the form of a brush by binding a large amount of fine metal wire with a fixed ring 17, but the disk, rod, Not only can be manufactured and used in various forms such as cup-shaped, of course, if necessary, abrasives such as grinding grindstones and sand paper that can be fixed to the polishing holder 11 can also be used.

In addition, a mounting portion 20 for accommodating the insertion rod 18 of the polishing holder 11 is provided at one side of the body 14a of the coupling 14 and at the same time, the recessed groove is formed inside the mounting portion 20. 21 is formed, and three fixing grooves 23a, 23b, and 23c are formed at the tip of the through hole 22 which is continuous in the recessed groove 21 to insert the insertion rod 18 of the polishing holder 11. Each of the engaging projections 19a, 19b, and 19c provided on the outer circumferential surface thereof can be fitted therein. Here, the engaging projections 19a, 19b formed in the polishing holder 11 and the coupling 14, respectively. And 19c and the fixing grooves 23a, 23b and 23c are formed opposite to each other, that is, instead of the engaging projections 19a, 19b and 19c of the polishing holder 11, the fixing grooves of the coupling 14 are formed. Instead of (23a, 23b, 23c) it may be configured to form a locking projection to be coupled and separated from each other.

A screw hole 24 is formed at the end of the body 14a of the coupling 14 so as to be fastened to the rotary shaft 13 of the grinder body 12, and a bush 25 is formed on the circumferential surface thereof. It is fitted and fixed in one piece.

In addition, a protruding portion 27 having a stepped portion 26a and an inclined surface 26b is formed at one side of the inner diameter portion of the sleeve 15 mounted on the circumferential surface of the coupling 14. An elastic spring 28 is interposed between the step 26a and the coupling 14, and protrusions 15a are formed on an outer circumferential surface of the sleeve 15 to prevent slipping during operation.

On the other hand, the locking ball 16 is accommodated in each of the three communication holes 29 formed on the same circumference of one side of the body 14a constituting the coupling 14, the couple when the slide 15 is moved The polishing holder 11 can be attached or detached by simultaneously releasing to the through hole 22 formed in the ring 14 and being inserted into or removed from the recess 18a provided in the insertion rod 18 of the polishing holder 11. It is configured to.

According to the present invention configured as described above, first, each locking ball 16 is inserted into the communication hole 29 in a state in which the elastic spring 28 is inserted into the body 14a of the coupling 14. By assembling 15, the elastic spring 28 is held by the projection 27 formed in the inner diameter portion of the sleeve 15, and the locking ball 16 is brought into contact with each other, so as to be separated from the communication hole 29. You will not be able to.

In this state, the coupling 14, the sleeve 15, the locking ball 16, and the elasticity are inserted by inserting the bush 25 into the front end of the body 14a of the coupling 14 and pressing-fixing them integrally. Since the spring 28 is maintained in each assembled state it can be configured as a single piece.

Thereafter, the screw hole 24 formed at one side of the through hole 22 of the coupling 14 is screwed into the rotation shaft 13 of the grinder main body 12, as shown in FIGS. 2A and 2B. The coupling assembly is maintained in the grinder main body 12.

In addition, when assembling the polishing holder 11 to the seating portion 20 side of the coupling 14, as shown in Figs. 3a and 3b, the sleeve 15 is first elastic spring 28 At the same time, it is pushed in the left direction to resist against and can be mounted by inserting the insertion rod 18 of the polishing holder 11 into the through hole 22 of the coupling 14.

That is, as the insertion rod 18 of the polishing holder 11 is assembled into the through hole 22, three locking balls 16 are pushed outward of the through hole 22, and the inner diameter of the sleeve 15 is increased. Temporarily moved toward the inclined surface 26b of the formed protrusion 27 and then inserted into the recess 18a of the insertion rod 18, and the sleeve 15 slides back to its original position by the restoring force of the elastic spring 28. Since the protrusion 27 pushes the locking ball 16 while being moved, the polishing holder 11 can be firmly fixed.

At this time, each of the engaging projections (19a, 19b, 19c) formed in the insertion rod 18 of the polishing holder 11 to each of the fixing grooves (23a, 23b. 23c) formed in the coupling 14 By being naturally inserted, the polishing holder 11 and the coupling 14 can be securely coupled to each other, and thus the polishing holder 11 can be easily mounted on the coupling 14. The same applies to the case where the 19b, 19c and the fixing grooves 23a, 23b, 23c are formed opposite to each other.

In addition, when the polishing holder 11 is separated from the coupling 14, as described above, the sleeve 15 is pushed to the left to make the space for the locking ball 16 to move, and then the polishing holder ( By pulling 11) out of the through hole 22 of the coupling 14, the polishing holder 11 fixed by the locking ball 16 can be easily removed from the coupling 14.

The above-described embodiment is described with respect to the most preferred example of the present invention, it is not limited to the above embodiment, it will be apparent to those skilled in the art that various modifications are possible without departing from the technical spirit of the present invention.

As described above, according to the polishing holder detachment structure of the hand grinder according to the present invention, since the polishing holder mounted on the rotating shaft of the grinder main body can be easily detached in a one-touch manner, a separate tool or fastening means is required. Not only that, but also the replacement of the abrasive can be performed more simply to improve the overall work efficiency.

In addition, during the grinding operation, the rotary shaft of the grinder main body and the coupling and the center of the grinding holder mounted on the coupling are rotated so as to minimize the vibration generated during the work process, thereby reducing the fatigue of the worker. In addition, the polishing holder has an effect that can be prevented in advance.

Claims (4)

An abrasive holder 11 having an abrasive rod 10 for processing an object on one side thereof and an insertion rod 18 having a groove 18a on the other side thereof; Coupling having a seating portion 20 for accommodating the insertion rod 18 of the polishing holder 11 and a screw hole 24 fastened to the rotary shaft 13 of the grinder body 12, respectively. 14, A sleeve 15 mounted to resiliently slide on the circumferential surface of the coupling 14, Consists of a locking ball 16 which is arranged to lock and release the polishing holder 11 while inclining toward the through hole 22 formed in the center of the coupling 14 as the sleeve 15 moves. Grinding holder detachable structure of the hand grinder characterized by the above-mentioned. According to claim 1, wherein the recessed groove 21 is formed inside the seating portion 20 of the coupling 14 and three fixing grooves at the tip of the through-hole 22 that is continuous in the recessed groove (21) 23a, 23b, 23c are provided, and three locking projections 19a, 19b, 19c are formed on the circumference of the insertion rod 18 of the polishing holder 11 by the fixing grooves 23a, 23b, 23c. Polishing holder detachable structure of a hand grinder, characterized in that configured to be fitted. According to claim 1 or 2, wherein the inner diameter portion of the sleeve 15, a projection 27 having a step (26a) and the inclined surface 26b is formed to regulate the position of the locking ball 16 And an elastic spring (28) interposed between the step (26a) and the coupling (14) of the protruding portion (27). 4. The locking ball (16) according to claim 3, wherein the locking balls (16) are respectively accommodated in three communication holes (29) formed on the same circumference of one side of the body (14a) forming the coupling (14). A polishing holder detachment structure of a hand grinder, characterized in that the polishing holder (11) is configured to be attached and detached at the same time to the through hole (22) in the center of the coupling (14) during the slide movement.