Abrading – Rigid tool – Rotary disk
Reexamination Certificate
1999-12-14
2001-10-09
Eley, Timothy V. (Department: 3723)
Abrading
Rigid tool
Rotary disk
C451S488000, C451S540000
Reexamination Certificate
active
06299522
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a grinding wheel for use in a grinding apparatus for grinding various materials such as brick, concrete, granite, marble, etc., and more particularly to a grinding wheel having dust discharge-impelling blades capable of impelling to discharge the dust produced during grinding operation to the dust collection machine to decrease dispersing the dust in the air, and increase cooling efficiency of the grinding wheel, thereby enhancing the grinding ability and the life of the grinding wheel.
2. Background of the Prior Art
Conventional grinding wheels
90
and
100
for use in grinding apparatus comprise plate type shanks
91
and
101
connected with a shaft of electric motor, and grinding tips
92
and
102
disposed fixedly in single or double circumferential array on shanks
91
and
101
by means of welding or joining, as shown in
FIGS. 11 and 12
.
Grinding tips
92
and
102
are fabricated by mixing particles of diamond or grinding materials, particles of metals composing of cobalt, nickel, bronze, copper, etc., or particles of resin or ceramic and forming a given shape out of the mixed particles by plastic working including press work.
On the shanks
91
and
101
, there is a plurality of round shape holes
93
and
103
for discharging grinding particles or dusts produced during grinding operation through the dust inlet portion or the hood of a dust collection machine which is disposed on the shanks
91
and
101
. Numerals
94
and
104
are rim portions.
In operation, the grinding wheels
90
and
100
are rotated at a high speed of about 10,000 RPM to let the grinding tips
92
and
102
to grind the materials in velocity of about 70 to 80 m/sec, and thereby the produced grinding particles or dust is carried with the centrifugal force corresponding to the moving velocity of the grinding tips
92
and
102
and inducted through the round shape holes
93
and
103
into the dust collection machine usually having air induction or wind velocity of about 25 to 30 m/sec and flux of about 1,000 to 1,300 l/minute when the diameter of a dust collection tube thereof is 30 mm.
However, at this time, since the air induction velocity of the dust collection tube of the dust collection machine is slower than the moving velocity of the grinding tips as noted above, i.e., the air induction force of the dust collection machine is smaller than the centrifugal force of grinding particles or dust, a large amount of grinding particles or dust was leaked out beyond the limits of the dust inlet portion of the dust collection machine disposed on the grinding wheels
90
and
100
for guiding dust to the dust collection tube of the dust collection machine, and dispersed in the air to give rise to the bad effect to users' health and the contamination of environment.
Further, since the air induction velocity for inducting dust into the dust collection tube of the dust collection machine is abruptly decreased to about 2 m/sec at a lower surface of the grinding tips
92
and
102
, i.e., a surface of materials, it was almost impossible to improve the dust dispersing problem only by increasing the wind velocity of the dust collection machine.
Also, since the grinding tips
92
and
102
are cooled only by air circulation, the grinding tips
92
and
102
located in the position which air induction velocity is abruptly decreased, was-easily carbonized or oxidized and thereby defaced by friction heat between the materials and the grinding tips during the continuous grinding operation for a long time to induce poor grinding and decrease the grinding efficiency and the life of the wheel.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a grinding wheel having dust discharge-impelling blades which are capable of impelling to discharge the dust produced during grinding operation to a dust collection machine to decrease dispersing the dust in the air and thereby to prevent the dispersed dust from giving rise to the bad effects to users' health and the contamination of environment.
It is the other object of the present invention to provide a grinding wheel having dust discharge-impelling blades which are able to increase the cooling efficiency of the grinding wheel to enhance the cutting ability and the life of the grinding wheel.
To accomplish these objects, a grinding wheel for use in a grinding apparatus according to one embodiment of the present invention comprises a shank for connecting with a shaft of an electric motor, having a plurality of dust discharging holes disposed at given intervals in the shank and dust discharge-impelling means disposed between dust discharging holes for impelling to discharge the dust produced during grinding operation through and in cooperation with the dust discharging holes, and a plurality of grinding tips disposed fixedly at predetermined intervals on the lower surface of a circumferential portion of the shank by means of welding or joining.
In this embodiment of the present invention, the dust discharge-impelling means is composed of a plurality of dust discharge-impelling blades formed to be slanted in the rotation direction of the shank and respectively having upper and lower surfaces disposed to define boundaries of the dust discharging holes therebetween and inclined upwardly from a horizontal plane to produce the air propelling force for discharging dust when the shank is rotated by the electric motor.
The shank of the present invention further includes a layer for fixing the grinding tips disposed on the lower surface of the shank.
It is desirable that the layer is fixed by heat resistance adhesive or screws on the lower surface of the shank.
Alternatively, the union between the layer and the lower surface of the shank can be accomplished by female and male spiral portions formed respectively in the layer and the shank.
Also, each of the grinding tips is disposed diagonally from circumferential direction on the line projected from the end portion of the dust discharge-impelling blade to increase contacting area between the grinding tips and materials to be ground.
It is desirable that the width of dust discharging holes in the vicinity of the center of the shank is getting narrower than that in the vicinity of circumference thereof.
In another embodiment of the present invention, a grinding wheel for use in a grinding apparatus comprises a shank for connecting with a shaft of an electric motor, having a plurality of dust discharging openings disposed at given intervals in the shank and opened in the circumferential portion of the shank and dust discharge-impelling means disposed between the dust discharging openings for impelling to discharge the dust produced during grinding operation through and in cooperation with the dust discharging openings, and a plurality of grinding tips disposed fixedly at predetermined intervals on the lower surface of the end portion of dust discharge-impelling means by means of welding or joining.
In this embodiment of the present invention, the dust discharge-impelling means is composed of a plurality of dust discharge-impelling blades formed to be bent at a given radius in rotation direction of the shank and respectively having upper and lower surfaces disposed to define the boundaries of the dust discharging openings therebetween and inclined upwardly from a horizontal plane to produce the air propelling force for discharging dust when the shank is rotated by the electric motor.
It is desirable that each grinding tip and the end portion of each dust discharge-impelling blade for adhering corresponding grinding tip are bent diagonally from the circumferential direction to increase contacting area between the grinding tips and the materials to be ground.
The shank of the present invention further includes a layer for fixing a plurality of grinding tips disposed respectively on the lower surfaces of the end portions of dust discharge-impelling blades.
It is desirable that the layer is fixed by heat resistance
EHWA Diamond Ind. Co. Ltd
Eley Timothy V.
Nguyen Dung Van
Vidas Arrett & Steinkraus P.A.
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