An Improved Plough Colter.
Year: 1892

page_text: Date of Application, 8th Dec., 1892-Accepted, 4th Feb., 1893
An Improved Plough Colter.
We, GEORGE ALFRED LAMBERT, ARTHUR ALBERT YOUNG, ISAAC HOLBROOK
SHERMAN and ELMER ALFRED SHERMAN, all of Belfast in the County of Waldo,
and State of Maine, United States of America, Manufacturers, 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 our invention is to produce an improved plough colter, which is
designed and adapted to aid the progress of a plough through a furrow and prevent
the accumulation in front of the plough of rubbish, vines, roots, or the like that
tend materially to increase the labour of directing the plough and the draft or
weight of the load upon the team which draws it.
In the accompanying drawings,
Figure 1 is a perspective view of a plough with our colter attached as in use.
Figure 2 is a perspective view of the colter detached.
Referring to the letters on the drawings, B indicates the shank of the colter,
which is preferably straight and somewhat flattened in its vertical part, as indicated
by the letter a, and is bent almost at right angles at its lower end b.
A indicates the cutter-blade of the colter, that is composed of the parts c, f,
and and is united to the shank and is preferably cast or forged with it. The
cutter-blade terminates in a point, an! its portion c is downwardly and forwardly
inclined, so as to present its cutting edge d underneath opposing obstacles, thus
severing them by a shearing action of the blade or forcing them upwardly out of
the ground and not against the resistance of the ground. The part of the
blade is laterally, rearwardly, and preferably somewhat downwardly bent. The
cutting edge d of the part c of the blade is dished or concave and merges gradually
into the cutting-edge e of the part f, which is slightly convex.
The two curves
unite to form a regular smooth compound curve. At the part g the blade A is
twisted so as to form a spiral, and extending toward the rear of the shank exposes
near its end a flat broad side, into which the cutting edge e in effect disappears.
The operation of our device is as follows:
The colter being in position upon a plough, as illustrated, for example, in Fig. 1
of the drawings, its point as the plough is driven into the soil cuts the ground in
advance of the plough, and sinking beneath the surface cuts the obstructions that
oppose themselves with sufficient resistance. The loose rubbish it carries along
the compound curve of its blade, cutting its way as occasion may require, and
finally deflecting and depositing from the twisted arm g to one side of the plough
any portion of trash that may remain uncut. In this manner a clean straight
furrow may be made. The clogging of the plough is prevented and the load upon
the team which draws the plough is materially diminished.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
1 claim is :-
A plough-colter consisting of a shank portion attached to the rear of the cutting-
blade, said blade having a downwardly and forwardly projecting cutting point and
being deflected laterally and rearwardly above its connection with the shank, its
extreme rear portion being twisted to form a spiral and extending toward the rear
10.
017

page_text: of the shank in a substantially horizontal direction and having a sharp front edge,
substantially as and for the purpose specified.
Dated this 8th day of December 1892.
F. W. BARKER,
Applicants' Agent.