Improvements in Apparatus for Sharpening the Knives of Reaping and Mowing Machines.
Year: 1896

page_text: Date of Application, 15th May, 1896
Complete Specification Left, 15th Feb., 1897-Accepted, 20th Mar., 1897
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Sharpening the Knives of Reaping
and Mowing Machines.
1, WILLIAM FRENCH, Blacksmith, Inveresk, Musselburgh, in the County of
Midlothian, do hereby declare the nature of this invention to be as follows:-
This invention has for its object to provide a simple and easily operated macbine for
use in sharpening or grinding to a suitable angle the cutting edges of the knives of
reaping and mowing machines.
The improved apparatus comprises a framing or table upon which is secured a
bracket carrying the spindle of a rotating emery wheel or other grinder which is
driven preferably by means of a chain wheel on the spindle and a chain passing round
it and round a chain wheel on a crank shaft below, the crank shaft being conveniently
operated by a foot treadle or hand crank. Upon the table a holder or number of
Y-shaped holders are bolted or otherwise secured to support the back of the knife bar
which is thus held at any desired inclination to the face of the grinding disc with the
knives projecting upwards vertically or approximately so.
One edge of each knife in succession is brought against the face of the grinding
disc and the knife being inclined to said disc the edge is ground at a suitable bevel.
The opposite edges of the several knives are ground in like manner by placing the
knife bar in its supports at the required inclination. In order to maintain the edge
of each knife in contact with the grinding surface a spring actuated rod or bar having
on its end a pad of rubber or other material is brought to hear on the back of the
knife. This bar or rod is held in a sleeve or bracket on the table facing the grinding
disc and it is provided at its rear end with a handle or lever which may be pushed
along a cam groove or otherwise acted on to withdraw the pad and release the knife
after the latter has been sharpened.
Car 1000
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Sharpening the Knives of Reaping
and Mowing Machines.
I, WILLIAM FRENCH, Blacksmith, Inveresk, Musselburgh, in the County of
Midlothian, 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 :-
This invention has for its object to provide a simple and easily operated machine for
use in sharpening or grinding to a suitable angle the cutting edges of the knives of
reaping and mowing machines.

page_text: The invention is illustrated by the accompanying drawings, Fig. 1 of which is a side
elevation and Fig. 2 an end elevation of the improved apparatus.
The improved apparatus comprises a framing or table A upon which is secured a
bracket B carrying the spindle of a rotating emery wheel or other grinder D which
is driven preferably by means of a chain wheel E on the spindle C and a chain F
passing round it and round a chain wheel G on a crank shaft H below, the crank
shaft H being conveniently operated by a foot treadle I or by a hand crank; and
the chain wheel may be loaded in order to bring the treadle to rest in its highest
position. Upon the table A a holder or number of Y-shaped holders J are bolted
or otherwise secured to support the back of the knife bar K which is shewn in
position in Fig. 2 (part of the apparatus being removed for greater clearness) and
thus held at any desired inclination to the face of the grinding disc D with the
knives L projecting upwards vertically or approximately so.
One edge of each knife L in succession is brought against the face of the grinding
disc D and the knife L being inclined to said disc D the edge is ground at a suitable
bevel. The opposite edges of the several knives are ground in like manner by placing
the knife bar in its supports J at the required inclination. In order to maintain the
edge of each knife L in contact with the grinding surface D a spring actuated rod
or bar M having on its end a pad N of rubber or other material is brought to bear
on the back of the knife L, which is being sharpened. This bar or rod M is held in a
sleeve or bracket 0 on the table A facing the grinding disc D and it is provided at
its rear end with a handle or lever P which may be pushed along a cam groove in
a lug or otherwise acted on to withdraw the pad N and release the knife L after
the latter has been sharpened.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
Apparatus for sharpening the knives of reaping and mowing machines consisting of
a rotating emery wheel or other grinder mounted over a table in combination with
V-shaped holders adjustably secured to said table and adapted to carry the knives of
the reaping or mowing machine at an inclination to the emery wheel, a pad being
provided to support the knives substantially as described.
Dated this 13th day of Fahrer 1907
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62 St. Vincent Street, Glasgow,
Agent for the Applicant.