Grinding wheel having a fixing unit
A grinding wheel includes a backing disk having a center hole, a plurality of coated abrasives flaps circumferentially arranged on the backing, a bolt being fitted through the center hole of the backing disk, the bolt having a head of a size larger than that of the central hole so that it hangs from the backing disk, a fastening member for fixing the bolt to the grinding wheel and a holder having an upper part into which the bolt is fitted and a lower part connected to a rotating part of a grinder.
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The present invention relates to a grinding wheel; and, more particularly, to a grinding wheel capable of being easily installed and uninstalled at a grinder.
BACKGROUND OF THE INVENTIONGenerally, a grinding wheel is mounted on a driving machine providing a rotational power thereto, and is used to grind a surface of a workpiece.
Referring to
Further, the connecting member 2 is screwed into an intermediate member 5 which has a coupling bar 5a fitted into a tool holder 4 of the grinder 3.
However, such type grinding wheel has a drawback in that the single-layer coated abrasives should be frequently exchanged since it is easily worn away.
Recently, for the reason described above, the grinding wheel of the flap type has mainly been used.
In general, the flap type grinding wheel has a lifetime longer than the grinding wheel of the quick-change disc type, and can uniformly grind a workpiece surface, thereby increasing a productivity thereof.
Referring to
The rotating shaft 22 is rotatably mounted at a head of the grinder 20. The rotating shaft 22 has an exterior threaded portion onto which a nut 30, the flap type grinding wheel 10 and a fastener 32 are sequentially screw-fitted.
The flap type grinding wheel is installed at the grinder 20, and a workpiece surface can be softly grinded by rotating this flap type grinding wheel at a high speed.
Accordingly, the flap type grinding wheel 10 can overcome the above problem of the grinding wheel of the quick-change disc type. However, the central hub 11 of the flap type grinding wheel 10 should be dimensioned depending on a diameter of the rotating shaft 22 of the grinder 20, thereby limiting a reduction of a size of the flap type grinding wheel 10.
As a result, the flap type grinding wheel would not be useful to grind a welded narrow area or a round surface. Further, a connecting procedure of the flap type grinding wheel is complicate, thereby requiring extended time period to exchange the grinding wheels.
SUMMARY OF THE INVENTIONIt is, therefore, an object of the present invention to provide a grinding wheel which can easily be exchanged, which is made in various sizes to be used in grinding a narrow area of workpiece, and which has an extended life time.
In accordance with a preferred embodiment of the present invention, there is provided a grinding wheel including: a backing disk having a center hole; a plurality of coated abrasives flaps circumferentially arranged on the backing disk and attached thereto; a bolt being fitted through the center hole of the backing disk, the bolt having a head of a size larger than that of the central hole so that it hangs from the backing disk; a fastening member for fixing the bolt to the grinding wheel; and a holder having an upper part into which the bolt is fitted and a lower part connected to the rotating part of the grinder.
BRIEF DESCRIPTION OF THE DRAWINGSThe above and other objects and features of the present invention will become apparent from the following description of a preferred embodiment given in conjunction with the accompanying drawings, in which;
Referring to
Meanwhile, the holder 136 has an upper part 136a of, e.g., a polygonal configuration and a lower part 136b of an elongated bar configuration. The upper part 136a of the holder 136 has an internal thread portion into which the bolt 132 can be screw-fitted. The lower part 136b is fixed to a rotating part 143 of a grinder 140. The rotating part 143 has a chuck 145 which is divided into a plurality of segments. The lower part 136b of the holder 136 is inserted into the chuck 145, and the chuck 145 is then fastened by a fastening nut 144, thereby fixedly connecting the lower part 136b of the holder 136 to the rotating part 143 of the grinder 140.
The bolt 132 is screw-fitted into the internal thread portion of the upper part 136a of the holder 136.
In this way, the flap type grinding wheel 100 is securely fixed to the rotating part 143 of the grinder 140.
In case the grinding wheel which has been worn out needs to be replaced with new one, the bolt 132 is disconnected from the holder 136 fixed to the chuck 145 of the grinder 140. Then, the grinding wheel is separated from the bolt 132 by way of releasing the nut 134 and the washer 133, and a new grinding wheel is installed in the holder 136 in the same manner described above. Accordingly, the grinding wheel can quickly be exchanged.
In addition, the flap type grinding wheel can be made in various sizes as long as it has the central hole 111 through which the bolt 132 can fit.
In particular, in case the flap type grinding wheel of a small size is required, the central hole 111 is formed with a small diameter and the size of the bolt 132 is determined depending on the diameter of the central hole 111. The inner diameter of the upper part 136a of the holder 136 is dimensioned to correspond to the bolt 132. In this way, the flap type grinding wheel of a diameter ranging from about 1 inch to 3 inch can be manufactured, which can be used in grinding a narrow welded area, a round surface, a cemented carbide metal alloy, a metal or the like.
While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims
1. A grinding wheel comprising:
- a backing disk having a center hole;
- a plurality of coated abrasives flaps circumferentially arranged on the backing disk and attached thereto;
- a bolt being fitted through the center hole of the backing disk, the bolt having a head of a size larger than that of the central hole so that it hangs from the backing disk;
- a fastening member for fixing the bolt to the grinding wheel; and
- a holder having an upper part into which the bolt is fitted and a lower part connected to a rotating part of a grinder.
2. The grinding wheel of claim 1, wherein the upper part of the holder has an internal thread portion and the bolt is screw-fitted into the internal thread portion.
3. The grinding wheel of claim 1, wherein the fastening member includes a washer and a nut, which are sequentially fitted onto the bolt protruding from the backing disk.
Type: Application
Filed: Feb 6, 2004
Publication Date: Feb 3, 2005
Applicant: Sun Abrasives Corporation (Gyeonggi-do)
Inventor: Tong Shin (Gyeonggi-do)
Application Number: 10/772,381