Knives of Mowing and Reaping Machines.
Year: 1886

page_text: Knives of Mowing and Reaping Machines.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of this invention to be as follows:-
The object of my invention is to furnish a device which will grind the two
adjacent edges of two mowing or reaping machine knives at once, grinding the
blades to a perfect bevel, without any danger of grinding, into and weakening
the bar to which the blades are attached.
My invention consists of two circular grindstones turning on the same shaft, and
slightly separated from each other, the edges of which are beveled 80 as to
correspond with the bevel to which the knives are to be ground. The slot or space
between the stones is to prevent the knife bar to which the knives are attached
from being ground into while grinding the knives. In order to separate the stones,
a disk of wood or metal of the proper thickness (about one quarter of an inch) and
of a less diameter than, the stones, is placed between them upon the shaft upon
which the stones turn, and in order that the stones will be sufficiently rigid;
the space between the wood or metal disk and the periphery of the grindstones
is nearly filled with plaster or some other suitable substance which will not grind
into the knife bar of the machine.
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3
The stones may be of any convenient diameter and are furnished with such a
bevel as to grind two knife edges at once.
Instead, of two separate stones as described above, a single stone may be used.
This stone would be furnished with a groove around the centre of the periphery,
and would have its edges beveled off.

page_text: Improvements in Apparatus for Grinding or Sharpening the
Knives of Mowing and Reaping Machines.
وراء
I HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co, Patent Agents,
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:-
The object of my invention is to furnish a device which will grind the two.
adjacent edges of two mowing machine blades at once, grinding the blades to a
perfect bevel without any danger of grinding into and weakening the bar to which
the blades are attached:
-
In the drawings, Fig. 1 is an end elevation of my improved grindstone, Fig. 2, a
side elevation; Fig. 3 a section of Fig. 2 on line x, x, and Fig. 4, a central sectional
elevation of a modification of my invention..
Referring to Figs. 1, 2 and 3, A, A¹, are two circular grindstones the edges of
which are beveled so as to correspond with the bevel to which the knives are to be
ground, B, is a flat piece of wood or metal placed between the stones A, A, C are
plates and D bolts for securing the stones together, and E is the shaft upon which
the stones are secured.
The stones A, A¹, may be of any convenient diameter, and are of such a
thickness and are furnished with such a bevel as to grind the two knife edges at
one operation.
The stones being separated from each other by the flat piece of wood or metal B
it is not possible for the knife bar of the machine to be ground into while grinding
the edges of the knives as is the case when a grindstone of the ordinary form is
used, for the central part of the stone is the only part that can come into contact
with the knife bar, and as this part is occupied by the open space F it is impossible
for the knife bar to be injured.
Instead of the two stones A, A¹; a single stone A, Fig. 4, may be used, this stone
has its edge furnished with a double bevel as shown and a circumferential groove F
is cut in the middle of its face, in order that the stone will not come in contact
with the knife bar while the knives are being ground.
By means of my device it is possible to grind the adjacent edges of two mowing
machine knife blades at once, and in such a manner that the proper bevel will be
given to both blades, and all tendency to grind into the knife bar upon which the
blades are fastened is overcome.
3
The stones are mounted in the usual manner and may be driven by any
.
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convenient means.
The shape or number of the pieces of wood or metal B which are employed to
separate the stones A; Ad, Figs. 1, 2 and 3, is immaterial as are also the devices
used to secure these two stones and the centre piece B together.
As the stones A, A¹, are very thin, in practice about one inch and a half thick,
it may be necessary to place in the groove or slot F some substance to partly fill it
in order to prevent vibration and to make its sides more firm.

page_text: I prefer to use plaster for this purpose as it has no grit, and when the stones
wear down it may be readily removed, but any other suitable substance, such as
rope, may be used.
In Figs. 3 and 4, the plaster is indicated by the letter G.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent I declare that what I claim is :-
1. The herein described grindstone for grinding mowing machine knives
consisting of a circular disk having its edge beveled off and a groove or slot on its
face, substantially as and for the purposes set forth.
2. The combination in a grindstone of the circular disks A, A¹, having their
edges beveled off as shown, and the plate B of smaller diameter than said stones,
said plate separating said stones and forming a space F between them, substantially
as and for the purposes set forth.
3. The combination in a grindstone of the stones A, A¹, having beveled edges,.
plate B of smaller diameter and separating said stones, and plaster G partly
filling the space F between the stones, all substantially as and for the purposes
set forth.