U.S. patent application number 10/772381 was filed with the patent office on 2005-02-03 for grinding wheel having a fixing unit.
This patent application is currently assigned to Sun Abrasives Corporation. Invention is credited to Shin, Tong Shik.
Application Number | 20050026556 10/772381 |
Document ID | / |
Family ID | 33536136 |
Filed Date | 2005-02-03 |
United States Patent
Application |
20050026556 |
Kind Code |
A1 |
Shin, Tong Shik |
February 3, 2005 |
Grinding wheel having a fixing unit
Abstract
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.
Inventors: |
Shin, Tong Shik;
(Gyeonggi-do, KR) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE
FOURTH FLOOR
ALEXANDRIA
VA
22314
|
Assignee: |
Sun Abrasives Corporation
Gyeonggi-do
KR
|
Family ID: |
33536136 |
Appl. No.: |
10/772381 |
Filed: |
February 6, 2004 |
Current U.S.
Class: |
451/466 |
Current CPC
Class: |
B24D 13/16 20130101;
B24B 45/00 20130101; B24D 13/20 20130101 |
Class at
Publication: |
451/466 |
International
Class: |
B24B 055/06 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 30, 2003 |
KR |
20-2003-0024581 |
Claims
What is claimed is:
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.
Description
FIELD OF THE INVENTION
[0001] 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 INVENTION
[0002] Generally, a grinding wheel is mounted on a driving machine
providing a rotational power thereto, and is used to grind a
surface of a workpiece.
[0003] FIG. 1 illustrates an exploded perspective view showing a
conventional grinding wheel 1 of a quick-change disc type being
installed at a grinder 3. FIG. 2 shows an exploded view showing a
conventional grinding wheel 10 of a so-called lamella or flap type,
wherein a plurality of coated abrasives flaps 13 are
circumferentially arranged and adhesively attached on a backing
disk 12.
[0004] Referring to FIG. 1, the grinding wheel 1 of the
quick-change disc type includes a single-layer coated abrasives cut
in a disk shape of a desired size. A connecting member 2 having an
exterior threaded portion is adhesively attached to a bottom
surface of the coated abrasives at the center thereof.
[0005] 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.
[0006] 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.
[0007] Recently, for the reason described above, the grinding wheel
of the flap type has mainly been used.
[0008] 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.
[0009] Referring to FIG. 2, the flap type grinding wheel 10
includes a backing disk 12 having a central hub 11 for receiving a
rotating shaft 22 of a grinder 20. A plurality of coated abrasives
flaps 13 are circumferentially arranged on the backing disk 12 and
attached thereto by using an epoxy adhesive.
[0010] 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.
[0011] 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.
[0012] 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.
[0013] 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 INVENTION
[0014] It 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.
[0015] 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 DRAWINGS
[0016] The 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;
[0017] FIG. 1 illustrates an exploded perspective view of a
conventional grinding wheel of a quick-change disc type;
[0018] FIG. 2 shows an exploded perspective view of another
conventional grinding wheel of a flap type;
[0019] FIG. 3 depicts an exploded perspective view of a grinding
wheel of a flap type in accordance with the present invention;
and
[0020] FIG. 4 provides a perspective view showing a process,
wherein the flap type grinding wheel of the present invention is
installed to a grinder.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] Referring to FIG. 3 and 4, there is illustrated a grinding
wheel of a flap type in accordance with a preferred embodiment of
the present invention. As shown in FIG. 3, a flap type grinding
wheel 100 includes a backing disk 110 having a center hole 111; a
plurality of coated abrasives flaps 120 circumferentially arranged
on the backing disk 110 and attached thereto by using, e.g., an
epoxy adhesive; and a fixing unit. The fixing unit includes a bolt
132, a nut 134, a washer 133, and a holder 136. The bolt 132 is
inserted from above through the center hole 111 of the backing disk
110. The bolt 132 has a head 132a of a diameter greater than that
of the center hole 111 of the backing disk 110 so that the bolt 132
hangs from the backing disk 110. The washer 133 and the nut 134 are
sequentially fitted onto the bolt 132, thereby fixing the bolt 132
to the backing disk 110.
[0022] 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.
[0023] The bolt 132 is screw-fitted into the internal thread
portion of the upper part 136a of the holder 136.
[0024] In this way, the flap type grinding wheel 100 is securely
fixed to the rotating part 143 of the grinder 140.
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
* * * * *