Improved Apparatus for Grinding or Sharpening Sheep Shearing Machines.
Year: 1892

page_text: Date of Application, 12th Feb., 1892-Accepted, 12th Mar., 1892
Improved Apparatus for Grinding or Sharpening Sheep Shearing
Machines.
We, CHARLES BURGON and HARRY BURGON, both of Malin Bridge, near
Sheffield in the County of York, England, Sheep Shear Manufacturers, do hereby
declare the nature of our invention for "IMPROVED APPARATUS FOR GRINDING
OR SHARPENING SHEEP SHEARING MACHINES" and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement:-
This invention relates to apparatus for grinding or setting the comb plates and
top cutters of sheep shearing machines, and the invention has for its object to pro-
vide a grinding disc having a grinding surface which is not so liable to become
accidentally injured as those now in use and which when worn or injured can be
easily renewed.
The invention consists of an iron disc having a portion of its face prepared for
and coated with a grinding medium, as hereafter described.
The invention will be described with reference to the accompanying drawing
which represents in Figure 1 a part sectional elevation of the machine provided
with two such grinding discs, one on each end of the same shaft, and in Figure 2 a
face view.
The same letters of reference denote like parts in both figures.
A Aare two discs preferably of cast iron keyed on the two ends of a shaft B
mounted in standards C and provided with fast and loose pullies D D¹ driven by
belt from a power-operated shaft. Each disc has the marginal portion a of its face
turned to a slight bevel or very flat conical form, as shewn, and this face is
roughened, to receive the grinding medium, by means of a fine turning tool traversed
in front of the work by means of a screw so as to produce a very fine groove in the
face a and so give the metal surface a "tooth" whereby it is enabled to tenaciously
retain the cement by which the grinding medium is applied. This cement is one
capable of being softened by heat and it may be composed of india-rubber, resin,
and pitch or bitumen, in equal parts. For the purpose of applying the same, the
disc is removed from its shaft, and heated to a temperature sufficient to melt the
cement applied to the face a. When an even coating of cement has been run over
the whole face a a superabundance of emery powder is applied to the molten cement
which after taking up as much of the emery as will adhere thereto, is allowed to
cool, after which the excess of emery is dusted off leaving the whole face of the
cement covered with a strongly adherent even coating of powder.
The two discs A A' would preferably receive emery of different grades of fineness,
so that the one disc may be used for rough grinding and the other for finishing the
grinding, or the coarser disc for grinding the combs and the finer one for grinding
the top cutters which having less surface to grind require a less powerful abradant
to sharpen them.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
-
A grinding disc for the cutters of sheep shearing machines made of iron with its

page_text: marginal surface a bevelled and roughened as described, then coated with cement
and finally with emery powder, as described.
Dated thin 10th J
1000
CHARLES BURGON.
HARRY BURGON.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.