U.S. patent application number 13/515797 was filed with the patent office on 2012-10-25 for grinding wheel assembly for facilitating attachment and detachment of a grinding tool.
This patent application is currently assigned to SUNGSIM CO., LTD.. Invention is credited to Hyung Seong Bae, Jeong Hee Park.
Application Number | 20120270483 13/515797 |
Document ID | / |
Family ID | 43135410 |
Filed Date | 2012-10-25 |
United States Patent
Application |
20120270483 |
Kind Code |
A1 |
Bae; Hyung Seong ; et
al. |
October 25, 2012 |
Grinding Wheel Assembly for Facilitating Attachment and Detachment
of a Grinding Tool
Abstract
The present invention relates to a grinding wheel assembly
usable in a polishing machine for finishing a surface or floor, and
more particularly, to a grinding wheel assembly for facilitating
attachment and detachment of a grinding tool, capable of preventing
damage to the grinding tool caused by centrifugal and frictional
force produced by high speed rotation, and which reduces working
time and enables convenient use due to easy replacement of the
grinding tool. The grinding wheel assembly includes a ferromagnetic
grinding tool, and a disk-shaped grinding wheel including a tool
mounting part with a recess shape sized for mounting the grinding
tool and a magnet embedded in one side. When required, a protruding
separation prevention pin is provided to stably mount the grinding
to the tool mounting part and a push injector pin is provided to
facilitate attachment and detachment of the grinding tool.
Inventors: |
Bae; Hyung Seong;
(Gyeongsangbuk-do, KR) ; Park; Jeong Hee;
(Gyeongsangbuk-do, KR) |
Assignee: |
SUNGSIM CO., LTD.
Gyeongsangbuk-do
KR
|
Family ID: |
43135410 |
Appl. No.: |
13/515797 |
Filed: |
October 18, 2010 |
PCT Filed: |
October 18, 2010 |
PCT NO: |
PCT/KR2010/007129 |
371 Date: |
June 13, 2012 |
Current U.S.
Class: |
451/540 |
Current CPC
Class: |
B24B 7/186 20130101;
B24D 7/066 20130101 |
Class at
Publication: |
451/540 |
International
Class: |
B24D 7/06 20060101
B24D007/06 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 14, 2009 |
KR |
10-2009-0123699 |
Claims
1. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool, comprising: a grinding tool (30) of
ferromagnetic; and a grinding wheel (1a) of a disk shape, having a
tool mounting part (2) which is shaped as a recess sized for the
grinding tool (30) to be mounted and into which a magnet (21) is
embedded in one side of the inner surface wherein the tool mounting
part (2) further comprises a push injector pin (4) that passes
through the grinding wheel (1a) in order to push the bottom surface
of the grinding tool (30) mounted in the tool mounting part (2) and
separate the grounding wheel from the magnet (21).
2. The grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 1, wherein the grinding tool
(30) is constituted by a steel plate (33) provided with at least
one pin through holes (32) in one side thereof and sized to be
mounted in the tool mounting part (2), and a grinding tip (31) that
is fixed protrudingly over the steel plate (33), and the tool
mounting part (2) further comprises a separation prevention pin
(22) that is protruded, corresponding to the number and location of
the pin through hole (32).
3. The grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 2, wherein the grinding
wheel (1a) is further provided with a recess for pushing (3) of a
concave shape into which the end of the grinding tool (30) is
mounted protrudingly along the outer peripheral surface
corresponding to the tool mounting part (2) in order to raise the
end surface of the grinding tool (30) and separate easily the
grinding tool from the magnet (21).
4. The grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 1, wherein the grinding
wheel (1a) is further provided with a recess for pushing (3) of a
concave shape into which the end of the grinding tool (30) is
mounted protrudingly along the outer peripheral surface
corresponding to the tool mounting part (2) in order to raise the
end surface of the grinding tool (30) and separate easily the
grinding tool from the magnet (21).
5. The grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 1, wherein the push injector
pin (4) comprises a push bar (4b) that is movable through the
grinding wheel (1a), a spring (4a) surrounding the part of the push
bar that protrudes to the lower part of the grinding wheel (1a) and
applying elastic force thereto, and a injector pin fixing screw
(4c) for fixing and locating the push bar (4b) that has passed
through the grinding wheel (1a).
6. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool, comprising: a grinding tool (30) of
ferromagnetic; and a grinding wheel (1a) of a disk shape, having a
tool mounting part (2) which is shaped as a recess sized for the
grinding tool (30) to be mounted and into which a magnet (21) is
embedded in one side of the inner surface wherein the grinding
wheel (1a) is constituted by a mounting wheel plate (10) that is
fixed to the grinding part and a replacement wheel plate (20) which
is sized to be in face-contact with one surface of the mounting
wheel plate (10) and mounted thereon, and is attachable and
detachable by a locking device (5), and in which the tool mounting
part (2) is formed.
7. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim. 6, wherein the mounting
wheel plate (10) of a disk shape is provided with a holding
protrusion (11) that is fixed protrudingly by a fixing bolt (11a)
on a middle part thereof, and a catching pin fixing hole (11b) that
is formed on a top surface of the holding protrusion (11), and a
locking device fixing hole (11c) that is provided on a middle part
of the holding protrusion (11).
8. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 7, wherein the replacement
wheel plate (20) comprises: a replacement base plate (20-1) of a
disk shape which has a middle hole (20-1a) through which the
holding protrusion passes, is in face-contact with one face of the
mounting wheel plate (10), and mounted, and in one side of which a
pin recess (20-11) through which a separation prevention pin (22)
passes is formed; a magnet fixing plate (20-2) of a disk shape
which has a middle hole (20-2a) through which the upper part of the
holding protrusion (11) having passed through the replacement base
plate (20-1) passes, is in face-contact with another face of the
replacement base plate, and is mounted, and in one side of which a
pin recess (20-22) through which the upper part of the separation
prevention pin (22) having passed through the pin recess (20-11) of
the replacement base plate passes and protrudes; and a tool guide
plate (20-3) in which a plurality of the tool mounting part (2) are
formed at interval, which is mounted on a top surface of the magnet
fixing plate (20-2), in which a middle hole (20-3a) sized for a
bottom surface of the locking device (5) to be mounted on a top
surface of the holding protrusion (11), and which supports the
grinding tool (30) provided in the tool mounting part (2).
9. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 8, wherein the separation
prevention pin (22) comprises: a middle screw part (22b) that is
screwed to the pin recess (20-11) of the replacement base plate
(20-1); a head part (22c) that passes through a separation
prevention pin head hole (12) of the mounting wheel plate (10) to
the lower part of the middle screw part; and a support pin part
(22a) which passes through the pin recess (20-22) of the magnet
fixing plate (20-2) to the upper part of the middle screw part and
has a length capable of being inserted into the pin through hole
(32) of the grinding tool (30) located in the tool mounting part
(2).
10. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 8, wherein the locking
device (5) of a disk shape is provided with a locking wing (5a)
protruding laterally, a middle bolt (5d) that is fixed to the
holding protrusion (11) locking device fixing hole (11c) at a
center thereof, a catching pin (5b) that is fixed to a catching pin
fixing hole (11b), and a taper recess (5c) that controls a rotation
angle of the locking wing (5a) by the catching pin (5b).
11. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 10, wherein the locking wing
has a 120.degree. and protrudes in a radial direction.
12. A grinding wheel assembly for facilitating an attachment and
detachment of a grinding tool of claim 10, wherein a wing mounting
part (20-24) to which the locking wing (5a) of the locking device
(5) is mounted according to its rotation is protruded and extended
in the middle hole (20-2a) of the magnet fixing plate.
Description
CLAIM TO FOREIGN PRIORITY
[0001] The present application is a U.S. National Stage Application
filed under 35 U.S.C. 371 claiming priority from International
Application No. PCT/KR2010/007129, filed Oct. 18, 2010, which
claims the benefit of priority of Korean Application No.
10-2009-0123699, filed on Dec. 14, 2009, which applications are
incorporated herein by reference.
FIELD OF THE INVENTION
[0002] The present invention relates to a grinding wheel assembly
provided in a polishing machine for finishing a surface or a floor
of concrete/asphalt and structure, and more particularly, to a
grinding wheel assembly for facilitating attachment and detachment
of a grinding tool and capable of preventing damage of the grinding
tool caused by centrifugal force and frictional force produced by
high speed rotation, reducing working time, and allowing convenient
utilization of the grinding wheel assembly due to ease of
replacement of the grinding tool.
BACKGROUND OF THE INVENTION
[0003] In general, the surfaces of various interior and exterior
ornamental materials for a building, including stone material such
as concrete and marble, are formed in a predetermined shape and
then subjected to a finish process for removing fine protrusions
and cracks remaining on the surfaces to improve salability and use
convenience thereof. In the finish process, a polishing machine
provided with a grinding tool on the lower part is used to perform
a polishing or gloss treatment by rotating the grinding tool at a
high speed.
[0004] In other words, referring to FIG. 1, grinding unit 102 to be
rotated at a high speed by a rotation force from driving unit 101
is provided at a lower part of polishing machine 100. In grinding
unit 102, a polishing or gloss treatment is performed through
grinding tool 120 provided at grinding wheel assembly 110 that is
rotated on a rotation axis.
[0005] Generally, grinding tool 120 for a polishing operation is
made by mixing, forming and then sintering diamond powder with
metal powder such as iron, tungsten, or cobalt powder. Grinding
tool 120 may be fabricated variably depending on operation
conditions of the concrete or marble to be polishing and the gloss
treatment.
[0006] The grinding tool may be worn away rapidly depending on the
operation time period and operation circumstances and further
damaged due to cracks formed while it is operating, and thus needs
to be replaced.
[0007] Accordingly, a configuration of grinding tool 120 must be
installed easily and promptly to grinding wheel assembly 110 and
further must not to be damaged due to friction force and
centrifugal force while it is rotated at a high speed and must not
become separated from the grinding wheel assembly.
[0008] According to the prior art the grinding tool has been welded
and attached directly to the grinding wheel assembly.
[0009] However, referring to the method for attaching the grinding
tool to the grinding wheel assembly using welding, when the
grinding wheel assembly is used for a long period of time and the
grinding tool is worn away, the grinding tool cannot be separately
replaced, and thus the whole grinding wheel assembly has to be
replaced which increases the component cost. Specifically, among
the plural components for constituting the grinding wheel assembly,
even if only part of the components are failed or damaged, the
whole grinding wheel assembly has to be replaced thereby
uneconomically wasting material and delaying the work schedule due
to the replacement.
[0010] In order to solve the drawbacks as described above, grinding
wheel assembly 110 in which grinding tool 120 can be easily
replaced has been studied, and prior grinding wheel assemblies will
be described referring to FIGS. 2-5.
[0011] As shown FIG. 2(a), according to a prior art, grinding tool
120 has been attached to grinding wheel assembly 110 by using a
plurality of bolts 121. However, according to the prior art the
plurality bolts have to be fastened and unfastened whenever the
grinding tool is replaced, thereby making the time period of the
installment procedure be long. In particular, there is still a
problem in that grinding tool 120 is disengaged from the grinding
wheel assembly due to a breakdown of the bolt.
[0012] Further, as shown in FIG. 2(b), a technology has been
proposed of attaching the grinding tool to the grinding wheel
assembly wherein supporting piece 122 protruding from both sides of
a bottom surface of grinding tool 120 is formed and supporting
piece connection recess 112a is formed on grinding wheel assembly
110 and adapted for the insertion of supporting piece 122 of
grinding tool 120.
[0013] Alternatively, as shown in FIG. 3 and in contrast to FIG.
2(b), fixing recess 123 is formed on a bottom surface of grinding
tool 120 and fixing protrusion 112c adapted to be forcibly fitted
into fixing recess 123 is formed in grinding wheel assembly
110.
[0014] The widths of supporting piece connection recess 112a and
the fixing recess 123 decrease gradually inwardly for the
supporting piece and the fixing protrusion to be guided so as to be
fixed easily thereto.
[0015] However, according to the method for fixing grinding tool
120 using a dovetail configuration as described above, additional
work for firmly fixing grinding tool 120 to grinding wheel assembly
110 according to a forcible fitness of the recess and the
protrusion is required such that the protrusion is struck by a
separate installment device such as hammer H.
[0016] As a result, a crack is produced while the protrusion is
driven into the recess and thus the structure to be supported such
as the supporting piece is shaped as protrusions 122 or 112c and
breaks down while the grinding operation is performed, thereby
damaging the grinding tool 120.
[0017] In addition, the bonding force between the grinding tool and
the grinding wheel assembly increased by using Velcro (112b in FIG.
2) when required, however, using Velcro is not very helpful when
grinding a coarse concrete surface.
[0018] In FIGS. 4 and 5, unlike the configurations shown in FIGS. 2
and 3, a technology has been tried for increasing the connection
force between the grinding tool 120 and the grinding wheel assembly
110 while improving operation efficiency, but which still needs
additional fixing work performed externally by using an installment
device such as hammer H in order that the grinding tool 120 will
not be broken and pulled out while operating, due to the connection
configuration of the connection recess 112a and the supporting
piece protrusion 122 which firmly fix the grinding tool to the
grinding wheel assembly.
[0019] Furthermore, as not shown in drawings, a wedge-bit has been
fitted between the protrusions of the grinding tool 120 and the
grinding wheel assembly 110 to fix the grinding tool 120, however,
the wedge-bit still required an additional separate installment
device such as hammer H.
[0020] As described above, in the prior grinding wheel assembly 110
a separate installment device is required to replace the grinding
tool 120 while it is operating, thereby delaying the replacement
time period and making it difficult for a beginner to replace the
grinding tool. Further, the fixing device configured as the recess
and protrusion types is damaged including crack production and
breaks down while a high speed rotation grinding operation is
performed.
[0021] As a result, there essentially needs a grinding wheel
assembly in which grinding tool 120 does not break down during high
speed rotation grinding and in which the grinding tool 120 can be
easily installed and replaced.
SUMMARY OF THE INVENTION
[0022] The present invention has been proposed, and an object of
the present invention relates to provide a grinding wheel assembly
for facilitating the attachment and detachment of a grinding tool
through which the grinding tool is not damaged during mounting and
not disengaged during grinding operations while permitting the
grinding tool to be mounted easily and quickly.
[0023] Furthermore, another object of the present invention relates
to providing a grinding wheel assembly for facilitating attachment
and detachment of a grinding tool in which the attachment and
detachment of the grinding tool is easily performed by using a
magnet and ferromagnetic grinding tool, providing a tool mounting
part to which the grinding tool is mounted wherein a separation
prevention pin is provided in one side of the tool mounting part
for fixing the grinding tool and thus the grinding tool is not
broken down or separated by centrifugal force, frictional force or
the weight of the polishing machine while a grinding operation is
performed.
[0024] In addition, still another object of the present invention
relates to provide a grinding wheel assembly for facilitating
attachment and detachment of a grinding tool in which a push
injector pin and a recess for pushing configured to push and raise
the grinding tool, when required, are provided in order to easily
separate the grinding tool fixed by a magnet.
[0025] According to an aspect of the present invention, a grinding
wheel assembly is provided, mounted to a grinding part of a
polishing machine, and performs a grinding operation, which
facilitates attachment and detachment of a grinding tool, the
grinding wheel assembly comprising a ferromagnetic grinding tool
and a grinding wheel having a disk shape. The grinding wheel
includes a tool mounting part shaped as a recess sized for mounting
the grinding tool and into which a magnet is embedded in one side
of the inner surface.
[0026] The grinding tool includes a steel plate provided with at
least one pin through holes in one side thereof and sized to be
mounted in the tool mounting part, and a grinding tip fixed
protrudingly over the steel plate. The tool mounting part further
comprises protruding separation prevention pins corresponding in
number and location of the pin through holes.
[0027] The grinding wheel is further provided with, when required,
a concave shaped recess for pushing on the end of the grinding tool
mounted along the outer peripheral surface corresponding to the
tool mounting part. The concave shaped recess assists in raising
the end surface of the grinding tool and easily separating the
grinding tool from the magnet.
[0028] Furthermore, the tool mounting part further includes, when
required, a push injector pin that passes through the grinding
wheel in order to push the bottom surface of the grinding tool
mounted in the tool mounting part and separate the grounding wheel
from the magnet.
[0029] The grinding wheel includes a mounting wheel plate that is
fixed to the grinding part and a replacement wheel plate which is
sized to be in face-contact with one surface of the mounting wheel
plate and mounted thereon, is attachable and detachable by a
locking device, and in which the tool mounting part is formed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The above and other aspects, features and other advantages
of the present invention will be more clearly understood from the
following detailed description taken in conjunction with the
accompanying drawings, in which:
[0031] FIG. 1 is a perspective view showing a polishing machine
provided with a grinding tool for grinding operation;
[0032] FIGS. 2 and 3 are perspective views showing a grinding wheel
assembly according to a prior art, respectively;
[0033] FIGS. 4 and 5 are views showing another grinding wheel
assembly according to a prior art, respectively;
[0034] FIG. 6 is a view showing schematically a grinding wheel
assembly in which a grinding tool is attached and detached easily
thereto according to the present invention;
[0035] FIG. 7 is a perspective view showing a grinding wheel
assembly in which a grinding tool is attached and detached easily
thereto according to the present invention;
[0036] FIG. 8 is an exploded perspective view showing the grinding
wheel assembly shown in FIG. 7;
[0037] FIG. 9 is a cross-sectional view showing the grinding wheel
assembly as shown in FIG. 7;
[0038] FIG. 10 is a main component cross-sectional view showing an
attachment and detachment of the grinding tool of the grinding
wheel assembly as shown in FIG. 7;
[0039] FIGS. 11 and 12 are views showing a locking device of the
grinding wheel assembly in which the grinding tool is attached and
detached easily according to the present invention, respectively;
and
[0040] FIG. 13 is a view showing a replaceable grinding tool
according to the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
[0041] Exemplary embodiments of the present invention will now be
described in detail with reference to the accompanying drawings.
The invention may, however, be embodied in many different forms and
should not be construed as being limited to the embodiments set
forth herein. Rather, these embodiments are provided so that this
disclosure will be thorough and complete, and will fully convey the
scope of the invention to those skilled in the art. Like reference
numerals in the drawings denote like elements, and thus their
description will be omitted.
[0042] FIG. 6 is a view showing schematically a grinding wheel
assembly in which a grinding tool is attached and detached easily
thereto according to the present invention.
[0043] As shown in FIG. 6, grinding wheel assembly 1 in which
grinding tool 30 is attached and detached easily thereto according
to the present invention is characterized in that grinding tool 30
is not disengaged from the grinding wheel assembly 1 and not broken
down due to friction force from a work surface, centrifugal force,
and the weight of the polishing machine even while grinding tool 30
is rotated at a high speed for grinding operation, and further the
grinding tool can be attached and detached easily and thus replaced
easily.
[0044] Grinding wheel assembly 1 in which the grinding tool is
attached and detached easily thereto, provided in a grinding unit
of a polishing machine for performing a grinding operation,
according to an embodiment of the present invention mainly includes
ferromagnetic grinding tool 30 and grinding wheel 1a (shown in FIG.
8 and comprising wheel plate 10 and replacement wheel plate 20)
having tool mounting part 2 to which grinding tool 30 is fixed by
magnet 21.
[0045] Tool mounting part 2 is provided at a predetermined interval
on grinding wheel 1a, corresponding to the number of grinding tools
30. Preferably tool mounting part 2 may be a recess adapted for
mounting grinding tool 30 and in one side of the inner part of
which magnet 21 is embedded.
[0046] Furthermore, a plurality of tool mounting parts 2 may be
provided depending on the number of grinding tools 30 to be mounted
therein or the part to be connected.
[0047] Additionally, grinding wheel 1a may have a disk shape so as
to be rotated easily at a high speed during a grinding operation of
the polishing machine.
[0048] A plurality of grinding tools 30 may be provided when
required. Grinding tip 31 of grinding tool 30, which during a
grinding operation is in contact with the surface being ground of
the material being ground and is seriously abraded, is made by
mixing diamond powder with metal powder such as iron, tungsten,
cobalt or the like as a bonding agent and formed and then sintered.
Grinding tip 31 of grinding tool 30 performs the grinding operation
or the gloss operation, depending on the operation circumstances of
concrete, marble or the like.
[0049] Grinding tool 30 as set forth above may be replaced by
another grinding tool, when required, for performing a separate
gloss operation at a low rotation speed, which will be described in
detail below.
[0050] As set forth above, grinding tool 30 is fixed and mounted to
the grinding wheel assembly by magnet 21 provided on tool mounting
part 2 of grinding wheel 1a. Grinding tool 30 is not disengaged
outside and is kept in place by the inner wall side of tool
mounting part 2 even while the grinding wheel assembly is rotated
at high speed for grinding operation.
[0051] To these ends, a trapezoid-shape recess may be formed in
tool mounting part 2 and grinding tool 30 may be shaped to be
included and mounted in tool mounting part 2 so that the location
of grinding tool 30 is fixed by magnet 21.
[0052] Furthermore, a plurality of separation prevention pins 22
that pass through one side of grinding tool 30 and are shaped as a
protrusion may be provided in tool mounting part 2 in order that
the grinding tool does not disengage and is fixed in place.
[0053] In more detail, grinding tool 30 is formed with at least one
pin through hole 32 on one side thereof, and includes ferromagnetic
steel plate 33, adapted for mounting in tool mounting part 2, and
grinding tip 31 that is fixed protrudingly on an upper part of
steel plate 33.
[0054] Further, separation prevention pins 22 are formed in tool
mounting part 2 is such number and location as correspond to pin
through hole 32 of grinding tool 30.
[0055] As set forth above, while the grinding operation is
performed, grinding tool 30 is prevented from disengaging by magnet
21 provided in tool mounting part 2 and further prevented from
disengaging by separation prevention pin 22 disposed passing
through grinding tool 30.
[0056] Grinding tool 30 tends to be pushed to the outside of
grinding wheel 1a due to the centrifugal force produced in a radial
direction as the grinding tool rotates at high speed while the
grinding operation is performed, and further tends to be disengaged
due to friction resistance of a heavy load from the ground.
[0057] In order to prevent this phenomenon, magnet 21 and
separation prevention pin 22 are provided, and further a tool
supporting protrusion 23 is formed in the inner wall end forming
tool mounting part 2 to enclose the outer part of mounted grinding
tool 30.
[0058] In more detail, supporting protrusion 23 serves as a support
for mounted grinding tool 30 and it protrudes in a hook form
inwardly at both ends of the inner wall of tool mounting part 2 so
that the end of grinding tool 30 that tends to protrude and be
disengaged due to centrifugal force is blocked thus stably
disposing the grinding tool. As a result, external separation of
grinding tool 30 can be avoided.
[0059] Fine gap a is formed between the inner wall side of tool
mounting part 2 and grinding tool 30 mounted on tool mounting part
2, as shown in FIG. 6. Here, the fine gap has a size of 0.2-0.3 mm
in both directions, and preferably has a size of 0.25 mm for easy
attachment and detachment of grinding tool 30.
[0060] Referring again to FIG. 6, grinding wheel assembly 1
according to the present invention may have various embodiments
through which the grinding tool 30 is easily attached and
detached.
[0061] As an exemplary embodiment, shown in FIG. 6(A), concave
recess for pushing 3 is further formed in the grinding wheel 1a
such that the end of grinding tool 30 protrudes along the outer
peripheral surface corresponding to tool mounting part 2 in order
that the end surface of mounted grinding tool 30 can be raised by
hand to disengage grinding tool 30 from magnet 21.
[0062] That is, the end surface of grinding tool 30 that protrudes
over recess for pushing 3 is pushed and raised using recess for
pushing 3 when grinding tool 30 must be replaced so that grinding
tool 30 is replaced easily with finger F using a small force.
[0063] Meanwhile, as shown in FIG. 6(B), push ejector pin 4 passing
through grinding wheel 1a is further provided in order to more
easily disengage grinding tool 30.
[0064] In more detail, push injector pin 4 passing through grinding
wheel 1a is further provided in tool mounting part 2 to push the
bottom surface of mounted grinding tool 30 and disengage grinding
tool 30 from magnet 21. When the lower end of push injector pin 4
is pushed, push bar 4b of FIG. 8 is raised by spring 4a of FIG. 8
provided in push injector pin 4 to push the bottom surface of
grinding tool 30 and disengage it from tool mounting part 2.
[0065] A plurality of push injector pins 4 may be provided in the
grinding wheel assembly, depending on the numbers of grinding tool
30 and tool mounting part 2. When the push injector pin is provided
in the grinding wheel 1a, a double nut is fastened thereto in order
to prevent release. As a result, the grinding tool cannot be
released even in the case of frequent impacts. In addition, bellows
rubber cap 4-1 of FIG. 7 is provided around the spring in order to
prevent external dust from entering therein.
[0066] In more detail, referring to FIG. 8, push injector pin 4
includes push bar 4b that passes through grinding wheel 1a and is
movable, spring 4a that surrounds apart of the push bar protruded
to the lower part of grinding wheel 1a and applies elastic force
thereto, and injector pin fixing screw 4c for fixing the push bar
to the location where the push bar passes through grinding wheel
la.
[0067] Meanwhile, recess for pushing 3 and push injector pin 4 may
be modified when required to enable easy attaching and detaching of
the grinding tool and may be provided separately or simultaneously
as shown in FIG. 6(C) to enable grinding tool 30 to be replaced
easily.
[0068] In one embodiment, the bottom surface of ferromagnetic
grinding tool 30 mounted on tool mounting part 2 is not in direct
contact with magnet 21 embedded in tool mounting part 2.
[0069] To this end, magnet 21 is embedded in the tool mounting part
with fine gap b from the bottom surface of tool mounting part 2.
Since magnet 21 is not directly in face-contact with the bottom
surface of grinding tool 30, the friction resistance and impact
which may be produced while the grinding operation is performed is
prevented, thereby increasing efficiency of magnet 21 and
increasing component life to improve operation efficiency.
[0070] Preferably, referring to FIG. 6, magnet fixing bolt 21-1 for
fixing magnet 21 is provided wherein the top surface of magnet
fixing bolt 21-1 becomes magnetic through the magnet and minimally
face-contacts the bottom surface of grinding tool 30.
[0071] FIG. 7 is a perspective view showing a grinding wheel
assembly in which a grinding tool is attached and detached easily
thereto according to the present invention. FIG. 8 is an exploded
perspective view showing the grinding wheel assembly shown in FIG.
7. FIG. 9 is a cross-sectional view showing the grinding wheel
assembly as shown in FIG. 7. FIG. 10 is a main component
cross-sectional view showing an attachment and detachment of the
grinding tool of the grinding wheel assembly as shown in FIG. 7.
FIGS. 11 and 12 are views showing a locking device of the grinding
wheel assembly in which the grinding tool is attached and detached
easily according to the present invention, respectively.
[0072] As shown in the drawings, referring to FIGS. 7-11, grinding
wheel assembly 1 for facilitating attachment and detachment of the
grinding tool will be described as followings.
[0073] Grinding wheel assembly 1 according to the present invention
is characterized in that tool mounting part 2 is formed, on which
the grinding tool is mounted, so that grinding tool 30 can be
attached and detached easily. Grinding tool 30 mounted on tool
mounting part 2 is prevented from falling out by magnet 21 and
prevented from disengaging by separation prevention pin 22 while
the grinding operation is performed.
[0074] Furthermore, it is characterized in that grinding tool 30 is
replaced more easily by using recess for pushing 3 and push
injector pin 4, when required.
[0075] As a result, operation efficiency of the grinding wheel
assembly 1 in which the grinding tool is attached and detached
easily is maximized, comparing to a prior art, such that mounted
grinding tool 30 does not disengage easily and break down during
operation, but grinding tool 30 is replaced easily and rapidly.
[0076] Grinding wheel assembly 1 has to be easily manufactured and
processed while performing the basic functions as set forth above,
and preferably, grinding wheel 1a includes mounting wheel plate 10
that is fixed to a grinding unit of a polishing machine, and
replacement wheel plate 20 which is attachable and detachable to
mounting wheel plate 10 and on which tool mounting part 2 on which
grinding tool 30 is mounted is formed.
[0077] Replacement wheel plate 20 is connected attachably and
detachably to locking device 5 and sized to be in face-contact with
one face of mounting wheel plate 10 and mounted thereon.
[0078] In more detail, referring to FIGS. 7-9, in grinding wheel
assembly 1 according to the present invention, mounting wheel plate
10 is a disk-shaped plate wherein holding protrusion 11 is fixed
protruding upward to a middle part thereof by fixing bolt 11a and
catching pin fixing hole 11b formed on a top surface of the holding
protrusion. Further, locking device fixing hole 11c is provided on
a middle part of the holding protrusion, into which the locking
device 5 is fixed and located even while it can be rotated.
[0079] Meanwhile, replacement wheel plate 20 comprises 3 disk-shape
plates and is configured to be fixed to and disengaged from
mounting wheel plate 10 by locking device 5.
[0080] Replacement wheel plate 20 includes replacement base plate
20-1 facing mounting wheel plate 10, magnet fixing plate 20-2 to be
fixed to replacement base plate 20-1, and tool guide plate 20-2
which is fixed to magnet fixing plate 20-2 and on which tool
mounting part 2 to which the grinding tool is mounted is
formed.
[0081] In more detail, replacement base plate 20-1 is a disk-shaped
plate provided with middle hole 20-1a through which holding
protrusion 11 of mounting wheel plate 10 passes. Pin recess 20-11
on which a lower part of separation prevention pin 22 is located is
formed on one side of replacement base plate 20-1 while facing one
face of the mounting wheel plate and mounted thereon.
[0082] Replacement base plate 20-1 is configured to serve as a base
plate for magnet fixing plate 20-2 that is mounted thereon and tool
guide plate 20-3 that is fastened and fixed thereto wherein those
plates are assembled and disassembled easily by using separation
prevention pin 22 and location setting pin 40a.
[0083] Meanwhile, magnet 21 is embedded in magnet fixing plate 20-2
for fixing grinding tool 30 mounted on tool mounting part 2, and
the magnet fixing plate has a disk-shaped plate with middle hole
20-2a through which the upper part of holding protrusion 11 passing
through the replacement base plate 20-1 passes and is faced to one
surface and mounted on the replacement base plate. Magnet fixing
plate 20-2 further includes magnet recess 20-21 in which magnet 21
is embedded and pin recess 20-22 through which the upper part of
separation prevention pin 22 passing through recess 20-11 of the
replacement base plate passes and is protruded, wherein magnet
recess 20-21 and pin recess 20-22 are formed on one side of the
magnet fixing plate.
[0084] Magnet fixing plate 20-2 as set forth above prevents
grinding tool 30 falling down on a ground while grinding tool 30 is
replaced and prevents dust and impurity produced while the grinding
tool is replaced and operated for grinding entering into the inside
of the magnet thereby preventing contamination and abrasion and
extending the life of the magnet.
[0085] Furthermore, in magnet 21 as mounted as set forth above, a
fine gap b of FIG. 6 is formed so that the magnet does not directly
contact grinding tool 30 and thus impact produced while the
grinding operation is performed is not transferred to the magnet
thereby increasing efficiency of the magnet.
[0086] Tool guide plate 20-3 serves to form tool mounting part 2
and prevent the separation of mounted grinding tool 30, and is
mounted on a top surface of magnet fixing plate 20-2 wherein a
plurality of tool mounting parts 2 are formed, when required, at an
interval such that grinding tool 30 is mounted sequentially at an
interval.
[0087] As a result, a space adapted to mounting the grinding tool
is formed by the top surface of magnet fixing plate 20-2 and the
inner side wall of tool mounting part 2 of tool guide plate 20-3.
Mounted grinding tool 30 is fixed and located by separation
prevention pin 22 of magnet fixing plate 20-2 and kept in place by
tool support protrusion 23 of tool guide plate 20-3.
[0088] Further, tool guide plate 20-3 has middle hole 20-3a sized
and shaped so that the bottom surface of locking device 5 can be
mounted on the top surface of holding protrusion 11. In more
detail, tool mounting part 2 has the same shape as main steel plate
33 of grinding tool 30 and further is provided with tool support
protrusion 23 to prevent the disengagement of grinding tool 30.
[0089] Tool support protrusion 23 protrudes from both ends of the
inner wall faces of tool mounting part 2 as a hook shape and
prevents the separation of grinding tool 30.
[0090] Meanwhile, separation prevention pin 22 provided in the
present invention includes middle screw part 22b screwed to pin
recess 20-11 of replacement base plate 20-1, head part 22c passing
through separation prevention pin head hole 12 of mounting wheel
plate 10 joined to the lower part of the middle screw part, and
support pin part 22a joined to the upper part of the middle screw
part. Support pin part 22a has a length sufficient to pass through
pin recess 20-22 of magnet fixing plate 20-2 and be fitted into pin
through hole 32 of grinding tool 30 disposed on tool mounting part
2.
[0091] Next, disk-shaped locking device 5 has locking wing 5a
protruding laterally and is provided with middle bolt 5d in the
middle part of the locking device that is fixed to fixing hole 11c
of holding protrusion 11. Locking device 5 further includes
catching pin 5b to be fixed to catching pin fixing hole 11b and
taper recess 5c for controlling the rotation angle of locking wing
5a using catching pin 5b.
[0092] The locking wing preferably has an angle of 120.degree. and
protrudes in a radial direction. Furthermore, wing mounting part
20-24 on which locking wing 5a of locking device 5 is mounted as it
is rotated protrudes into middle hole 20-2a of the magnet fixing
plate.
[0093] The locking device as configured in the forgoing serves to
fix replacement wheel plate 20 to mounting wheel plate 10 when
required and locking wing 5a prevents replacement wheel plate 20
being separated while the grinding operation is performed.
[0094] Referring to FIGS. 11 and 12, hereinafter, a locking state
of the grinding wheel 1a, that is, the mounting wheel plate 10 and
the replacement wheel plate 20 by the locking device 5 will be
described.
[0095] First, locking device 5 is connected to holding protrusion
11 of the mounting wheel plate 10 by middle bolt 5d and kept in
fixed-connected state rotatably at an arbitrary angle.
[0096] As a result, locking wing 5a of locking device 5 is
configured movably depending on the intention of the user. The
rotation radius and rotation angle of locking wing 5a are
controlled depending on the size of taper recess 5c.
[0097] Catching pin 5b is fitted along both end taper surfaces of
taper recess 5c to be fixed thereto so that the locking wing is not
separated even due to vibration.
[0098] Furthermore, any users may rotate the locking wing 5a of the
locking device 5 for the locking wing 5a to be mounted on the wing
mounting part 20-24 so that replacement wheel plate 20 is not
separated downward while replacement wheel plate 20 is fixed over
mounting wheel plate 10 for grinding operation.
[0099] Replacement wheel plate 20 of grinding wheel 1a is replaced
easily to increase operation efficiency while it is fixed stably to
mounting wheel plate 10 by the locking device as configured in the
forgoing.
[0100] Grinding tool 30 or 30a may be selected and replaced by a
user, according to respective work process in which a grinding
operation is performed or a simple gloss operation is performed
depending on surface roughness or state of the material to be
ground.
[0101] FIG. 13 is a view showing a replaceable grinding tool
according to the present invention, and as shown in FIG. 13,
grinding tool 30a for a gloss operation has the same size and shape
as the whole grinding wheel and further includes Velcro surface
30a-1 for attaching and detaching replacement grinding tool 30b on
a top surface of grinding tool 30a.
[0102] Furthermore, replacement grinding tool 30b is provided with
tip 31a for a gloss operation on a top surface thereof and is
attached and detached to the Velcro surface of grinding tool 30a by
Velcro surface 30b-1 formed on a bottom surface of replacement
grinding tool 30b.
[0103] Also, a steel plate of a size which is mountable to tool
mounting part 2 is provided in order that the grinding tool 30a can
be attached and detached to tool mounting part 2.
[0104] When steel plate 33 is mounted to tool mounting part 2, the
grinding tool 30a is located and fixed by the magnet 21 and is
attached and detached easily by push injector pin 4 and the recess
for pushing.
[0105] A plurality of steel plates 33 may be provided to allow easy
mounting to tool mounting part 2.
[0106] Additionally, the location where the ferromagnetic steel
plate is mounted on grinding tool 30a may be arbitrarily modified,
as shown in FIGS. 6-12, to serve as grinding tool 30.
[0107] The present invention relates to a grinding wheel assembly
for facilitating the attachment and detachment of the grinding
tool, and according to the exemplary embodiments of the present
invention, the grinding tool is not broken and disengaged during
the grinding operation while the grinding tool is replaced easily
and promptly through the attachment and detachment way of the
grinding tool using a magnet, thereby maximizing operation
efficiency compared to the prior art. Furthermore, the grinding
tool is not easily moved from its location during the grinding
operation due to the separation prevention pin and the tool
mounting part and further crack and breakage of the grinding tool
can be prevented by efficiently distributing the centrifugal force
and frictional force. In addition, the grinding tool is easily
separated from the grinding wheel by using the push injector pin
configured to push the bottom surface of the grinding tool and the
recess for pushing, depending on user's intention, and thus even a
beginner can easily replace the grinding tool and the industrial
application of the grinding wheel assembly is recognized
appropriately.
[0108] As set forth above, according to exemplary embodiments of
the grinding wheel assembly for facilitating the attachment and
detachment of the grinding tool, the grinding tool is not broken
and disengaged during the grinding operation while the grinding
tool is replaced easily and promptly through the attachment and
detachment way of the grinding tool using a magnet thereby
maximizing operation efficiency, comparing to the prior art.
[0109] Furthermore, the grinding tool is not easily moved from its
location during the grinding operation due to the separation
prevention pin and the tool mounting part and further crack and
breakage of the grinding tool cab be prevented by efficiently
distributing the centrifugal force and frictional force.
[0110] In addition, the grinding tool is easily separated from the
grinding wheel by using the push injector pin configured to push
the bottom surface of the grinding tool and the recess for pushing,
depending on user's intention, and thus even a beginner can replace
easily the grinding tool.
[0111] While the present invention has been shown and described in
connection with the exemplary embodiments, it will be apparent to
those skilled in the art that modifications and variations can be
made without departing from the spirit and scope of the invention
as defined by the appended claims.
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