Improvements in Emery and similar Grinding Wheels.
Year: 1890

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by WILLIAM M. WOOD, of Boston, Massachusetts,
United States of America.]
Improvements in Emery and similar Grinding Wheels.
1, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of this invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
My invention relates to the construction of emery wheels, or wheels made of other
similar abrasive or polishing material, and designed for use in removing protuberances
or projections from metal or other objects so as to produce a uniformly smooth or
plain surface. My invention is especially designed for wheels used for removing the
burr formed at the weld made by the well known electric welding process.
My invention consists essentially in providing the wheel with two guards of non-
abrasive material consisting of discs or plates applied to opposite sides of the wheel
and coming out flush at their edge with the grinding surface of such wheel. These
guards being thus constructed are adapted to engage with the material in its plain or
flat portions at the sides of the projections to be reduced and to thereby prevent the
reduction or lowering of the general plane by the grinding or cutting while at the
same time permitting the wheel itself to operate freely and abrade or grind the parts
rising above such plane.
I have herein illustrated my invention as embodied in a tool particularly adapted to
removing the burr from pieces of metal joined by the electric welding process wherein
end pressure is employed so as to cause the metal to upset at the joint.
In the accompanying drawings:-
-
Figure 1 is a side elevation of a wheel embodying my invention.
Figure 2 illustrates a modification wherein two wheels of different degrees of fineness
are combined in one structure.
Figures 3 and 4 illustrate the two positions of the tool shown in Figure 2.
Referring to Figure 1 A indicates the body of the wheel which is made of emery or
similar abrasive or grinding substance and is mounted upon a suitable shaft which
passes through a suitable housing or tubing C, by which the wheel may be held in the
hand, motion being communicated to such shaft through a flexible connection or shaft.
The portion of the wheel A may be wholly of emery, or may simply be faced with the
emery to a suitable depth.
BB indicate the metal guards which are designed to prevent the part A, of the
wheel from cutting or grinding below the general plane of the object operated upon.
These guards B B are of some non-abrasive material and are selected preferably with
reference to the wear of the wheel A, in practical operation. In practice I find that
for removing the burrs or projections from iron a metal like cast brass will do very
well for the guards B B as it will wear at about the same rate as the emery. Of
course the material for the guards would vary in any case with the natural rate of
wear of the grinding wheel A when used in any particular kind of work.
be
In case the soft metal guards and the wheel A, wear at all unevenly, a file, steel
point or edge may be used for truing up. As the edge is of soft metal it may
readily and quickly trued by holing a file against it while it is rapidly revolved.
In Figure 2, I have shown a wheel as made of two parts A³ A³, each of an abrasive
or grinding substance, but of different degrees of fineness. The guards B, B, B, are
applied as shown, and the two parts of the compound wheel are beveled away from
the centre, as indicated, so as to permit it to be used in the inanner indicated in
Figures 3 and 4, the coarse wheel being used for taking off the greater part of the
burr or projection, and the burr being afterwards finished with the finer wheel as

page_text: indicated in Figure 3. The guards may be secured to the wheel in any desired way
as by bolts passing through or by clamping the wheels and the guards together on the
shaft.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent 1 declare that what I claim is :-
First. The combination with the grinding wheel, of two smooth or non-grinding
guard plates or discs arranged at opposite sides of the said wheel and having their
edges flush with the grinding surface of the wheel, as and for the purpose described.
Second. The combination "substantially as described, of the emery wheel A, having
guard plates or discs applied to its opposite faces, of a shaft on which said wheel is
mounted, and a housing or tube C, as and for the purpose described.
Third. An emery wheel made in two parts of different degrees of fineness separated
by a solid non-grinding guard plate flush with the grinding surface, in combination
with exterior guard plates also flush with the grinding surface, as and for the purpose
described.
Fourth. A compound emery wheel the two parts of which are of different degrees
of fineness and are beveled away from the centre, in combination with non-grinding
guard plates applied to opposite sides of the wheel flush with the edge thereof, and an
intermediate guard plate between the two parts of the wheel and flush with the greater
circumference of the same, as and for the purpose described.
Dated this 18th day of November 1890.
HASELTINE, LAKE & (Jo.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.