IMPROVEMENTS IN APPARATUS FOR SHARPENING, THE CUTTERS OF MOWING MACHINES
Year: 1869

page_text: LETTERS PATENT to William M'Kenzie, Thomas M.Kenzie, and
James M Kenzie, of the Firm of Thomas McKenzie and Sons, of
No. 34, Dawson Street, Dublin, Ireland, for the Invention of
"IMPROVEMENTS IN APPARATUS FOR SHARPENING, THE CUTTERS OF MOWING
MACHINES." A communication from: abroad by. Messrs.. La Due,
Blish, and Co., of the City of Chicago, in the State of Illinois, United
States of America.
Sealed the 21st June 1870, and dated the 22nd December 1869..
PROVISIONAL SPECIFICATION left by the said William McKenzir,
Thomas M'Kenzie, and James McKenzie at the Office of the
Commissioners of Patents, with their Petition, on the 22nd December
1869.
3 We, WILLIAM MCKENZIE, THOMAS MCKENZIE, and JAMES MCKENZIE,
of the Firm of Thomas McKenzie and Sons, of No. 34, Dawson Street,
Dublin, Ireland, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN APPARATUS FOR SHARPENING THE CUTTERS OF MOWING
MACHINES," to be as follows:-
The object of this Invention is to provide an improved machine for
sharpening the cutters of mowing and harvesting machines while they

page_text: are attached to the cutter bar. It consists of an angular faced
reciprocating stone arranged to work over a transverse adjustable bed in
which the cutter bar is supported in such a position that the stone
working in the angle between the cutters will bear upon the edges of the
cutters forming the angle. The support is adjusted by arms and set
screws, so that the stone will bear fair across the bevilled edges of the
cutters. The stone is then reciprocated until they are sufficiently ground,
after which it is raised sufficiently for the cutter bar to be moved along
to bring the next cutting edges under it. The operation is continued
in this manner until all the cutters are ground. A presser wheel is
arranged upon the top of the stone in a swinging frame having a handle
by which the operator may apply the necessary pressure on the stone
either by the hand or by a weight suspended to the said handle. The
reciprocating stone receives its motion by a connecting rod from a circular
stone fixed upon the crank shaft to act as a balance wheel, and also to
grind the cutters in case they become notched by striking stones or from
any cause require an unusual amount of grinding in any particular
place; it may also serve a good purpose for grinding other implements.
There are recesses to be supplied with water, and sponges may be
introduced to convey the water up to the face of the stone by capillary
attraction. Instead of adjusting the support to the face of the stone,
the stone may if preferred be arranged to be adjusted to the cutters.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William M.Kenzie, Thomas McKenzie, and
James McKenzie, in the Great Seal Patent Office on the 21st June
1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
MCKENZIE, THOMAS MOKENZIE, and JAMES MCKENZIE, of the Firm of
Thomas McKenzie and Sons, of No. 34, Dawson Street, Dublin, Ireland,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of December, in the
year of our Lord One thousand eight hundred and sixty-nine, in the
thirty-third year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said William McKenzie, Thomas M*Kenzie,

page_text: and James McKenzie, Her special licence, that we, the said William
McKenzie, Thomas McKenzie, and James M.Kenzie, our executors, ad-
ministrators, and assigns, or such others as we, the said William M⚫Kenzie,
Thomas McKenzie, and James McKenzie, our executors, administrators,
and assigns, should at any time agree with, and no others, from time
to time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN APPARATUS FOR
SHARPENING THE CUTTERS OF MOWING MACHINES," a communication to them
from abroad by Messrs. La Due, Blish, and Co., of the City of Chicago,
in the State of Illinois, United States of America, upon the condition
(amongst others) that we, the said William McKenzie, Thomas
McKenzie, and James McKenzie, our executors or administrators, by an
instrument in writing under our, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that we, the said William McKenzie, Thomas
McKenzie, and James M.Kenzie, do hereby declare the nature of our
said 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 this Invention is to provide an improved machine for
sharpening the cutters of mowing and harvesting machines while they
are attached to the cutter bar. It consists of an angular faced recipro-
cating stone, arranged to work over a transverse adjustable bed on
which the cutter bar is supported in such a position that the stone
working in the angle between the cutters will bear upon the edges of the
cutters forming the angle. The support is adjusted by the arms and set
screws, so that the stone will bear fair across the bevelled edges of the
cutters. The stone is then reciprocated until they are sufficiently ground,
after which it is raised sufficiently for the cutter bar to be moved along
to bring the next cutting edges under it. The operation is continued in
this manner until all the cutters are ground. A presser wheel is
arranged upon the top of the stone in a swinging frame having a handle

page_text: III. The arrangement for holding the angular faced grindstone 6 in
the frame m, m, which is guided by the arms m³, m³, as they pass under
the rollers 9, 9, and between the hangers ff, on the central end of the
water vessel n, n.
IV. The reciprocating motion of the sickle grindstone in the
frame m, m, communicated by the connecting rod c which takes its
motion from the crank x¹.
V. The fastening of the angular faced grindstone in the frame m, m,
by two set screws 8, 8.
VI. The combination of the water vessel n, n, with the frame m, m,
and connecting rod c with the hangers f.f, and the rollers g, g.
We would have it understood that we do not wish to limit ourselves
to the precise form and details shewn by the Drawings and described
with reference thereto, nor do we claim the mere constituent details
per se and apart from the purpose of our said Invention.
In witness whereof, we, the said William McKenzie, Thomas
McKenzie, and James McKenzie, have hereunto set our hands and
seals, this 8th day of May in the year of our Lord 1870.