Improvements in or relating to the Teeth of Spring Tooth Cultivators.
Year: 1894

page_text: Date of Application, 30th Jan., 1894-Accepted, 7th Apr., 1894
COMPLETE SPECIFICATION.
Improvements in or relating to the Teeth of Spring Tooth
Cultivators.
LYMAN MELVIN JONES Manufacturer WILLIAM F. JOHNSTON Manufacturer
both of 915 King Street West, in the City of Toronto, in the County of York, in
the Province of Ontario, Canada, 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 :-
Our invention relates more particularly to improvements in the teeth of spring
toothed cultivators in which the teeth are fastened in gangs on sectional frames
each frame of which is capable of independent movement or are each attached to
a single independent drag bar and the object of the invention is to so construct the
point of the tooth that it may be readily changed to suit the various natures and
conditions of the soil to be worked and at the same time provide a cheap and rapid
means for renewing the working point of the teeth when worn by use or otherwise
injured without the necessity of having to substitute an entirely new tooth or teeth
and it consists essentially of constructing the main sweep of the tooth in the usual
manner and attaching to the lower end preferably a double pointed blade
corresponding longitudinally to the sweep of the lower portion of the tooth to
which it is secured preferably by screw bolts counter sunk in the front surface of
the blade as hereinafter more particularly explained.
Fig. 1, is a perspective view of a spring tooth constructed in accordance with
our invention.
Fig. 2, is a longitudinal section through the tooth showing the manner in which
the double-pointed blade is attached to the bottom of the tooth.
Fig. 3, is a detail of the blade.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A, is a curved spring tooth preferably made of steel, the upper part being bent
to fit on to the seat as used with a sectional frame or an independent drag-bar of a
cultivator and the lower part being bent so as to continue the curve of the upper
part and form the bottom forwardly projecting portion of the tooth. B, is a blade
which is preferably formed double-pointed or in other words with two points, b, one
at each end. This of course is not necessary as it might be formed with just the
single point. If made preferably with a point at each end, such points might be
made of different form, as shown, in order to provide for the working of different
natures of soil. The curve of the blade, B, corresponds longitudinally to the
curve at the bottom forward portion of the tooth and the width of the blade, B, is
preferably wider than the width of the bottom lower portion of the tooth.
The blade, B, is affixed to the lower front curved portion of the tooth preferably
by screw bolts, C, and nuts, c, the heads of the bolts being counter-sunk and
therefore flush with the surface of the blade, B.
From this description it will be seen that we provide a very simple and effective
removable point for spring teeth of cultivators, which may be made of any desired
temper or shape to accommodate the different natures or conditions of the soil.
Again as the blade is removably secured to the main body of the teeth it will be
seen that it will be unnecessary to supply entirely new teeth for the cultivator
when it is desired to work different classes of soil, it being merely necessary to
supply new points.
Although we mention that the blade may be made single pointed it will of course
be obvious that it will be more economical to make the blade double pointed

page_text: as described as it will be seen by making the blade double-pointed that a
saving of both time and material will be effected when it is desired to change
the point of the tooth for different natures of the soil it is desired to cultivate.
It will of course be understood that it will be unnecessary to supply new teeth
for the cultivator when it is desired to cultivate a different class of soil as it
is merely necessary to change the points, consequently expense incidental to
substituting entirely new teeth is avoided.
:
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 :-
-
1. The combination with a curved spring tooth suitably shaped at the top to fit
on to a toothed seat on the sectional frame or drag-bar of a cultivator, of a detachably
connected working point longitudinally curved to correspond to the forward curve
of the bottom portion of the tooth as and for the purpose specified.
2. In a spring tooth for cultivators the combination with the major portion of
the curved spring tooth, of a double pointed blade, the lower end of which extends
forward beyond the end of the major portion of the tooth while the upper end rests
upon such curved portion of the tooth, and means whereby the blade is secured in
position as and for the purpose specified.
3. In a spring tooth for cultivators the combination with the major portion of
the curved spring tooth, of a double pointed blade, the lower end of which extends
forward beyond the end of the major portion of the tooth while the upper end rests
upon such curved portion of the tooth and the side edges of the blade extend
beyond the side edges of the major portion and means whereby the blade is secured
in position as and for the purpose specified.
4. In a spring tooth for cultivators the combination with the curved spring
portion, A, of the blade, B, provided with points, b, preferably different in form
and secured by the bolts, C, and nuts, c, to the forward end of the major
portion, A, the heads of the bolts being counter-sunk in the blade, B, as and for
the purpose specified.
Dated this 15th day of In 1901
LYMAN MELVIN JONES.
WILLIAM F. JOHNSTON.