Improvements in Cultivator Teeth.
Year: 1894

page_text: Date of Application, 13th Dec., 1894-Accepted. 23rd Feb., 1895
COMPLETE SPECIFICATION.
Improvements in Cultivator Teeth.
We, LYMAN MELVIN JONES, Manufacturer, and 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 to a certain new and useful improved spring tooth for
cultivators and the object of the invention is to provide a means whereby a light
weight of tooth may be made to withstand the strain incident to use, have a stronger
forward spring when in use and which practically cannot be broken at the upper
portion where the strain is most severely felt when the tooth rebounds after
meeting an obstruction and it consists essentially in providing a supplemental strap
of spring metal which is beld securely at the top against the tooth by the bolt,
which secures the said tooth to its seat and is suitably secured at the lower end
at or about the point where the tooth is reversely curved as hereinafter more
particularly explained.
Fig. 1, is a perspective view showing our tooth with attachment.
Fig. 2, is a section through the tooth showing the means whereby it is secured to
its seat on the section.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A, is the tooth, the upper portion, A', of which is curved rearwardly and the
lower portion, A2, of which is curved reversely so as to point forward. The upper
portion, A', is provided with a slotted bolt hole, a. B, is a supplemental strap of
spring metal which fits closely to the rear portion of the upper curve of the tooth
but extends around at a greater radius than the tooth to a point where the reverse
curve of the tooth commences so that an elongated opening, ', is formed between
the tooth and strap. The lower end of the strap, B, is bent to form an end groove, b,
around which and the tooth passes a link, C.
Although we show the lower end of the supplemental spring strap, B, attached
at its point by means of the link, C, it will of course be understood that it might
be rivetted or other means might be used to fasten it, but we prefer to use the
means shown as it will not weaken the tooth.
The upper end of the strap, B, is slotted correspondingly to the tooth, A, for the
passage of the bolt, D which passes through the rear bar, E, of the section upwardly
through both tooth and strap and the block F, at the top of which it is secured in
position by the nut, d.
Although we show the strap at the front end of the tooth and outside the tooth
as to the cross bar of the section to which it is secured, it will be understood
that it might be placed to the inside of the tooth' proper and to the rear of the
upper portion of such tooth but we prefer the construction shown.
It will be seen that such strap is curved at a larger radius than the upper
portion of the tooth and consequently it will permit of the tooth to move
rearwardly when in use and yet stiffen it to keep it to its work. When the
tooth rebounds the spring strap will help it forward quickly and yet strengthen
the tooth and prevent any danger of its snapping or breaking near the
upper end.

page_text: 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, of a curved spring strap
secured to the upper end of the tooth by the bolt, which secures the tooth to its
seat and extending around the upper curved portion of the tooth to a point
at which the reverse curve of the tooth commences as and for the purpose
specified.
2. The combination with a curved spring tooth, of a curved spring strap
secured to the upper end of the tooth by the bolt, which secures the tooth to its
seat and extending around the upper curved portion of the tooth to a point at
which the reverse curve of the tooth commences and means for securing the end
of the strap to the tooth at such point as and for the purpose specified.
3. The combination with a curved spring tooth, of a curved spring strap secured
to the upper end of the tooth by the bolt which secures the tooth to its seat and
extending around the upper curved portion of the tooth to a point at which the
reverse curve of the tooth commences, the lower end of the strap being shaped so
as to form a cross groove and a link being provided which extends through the
grocve and around the back of the tooth to hold them together as and for the
purpose specified.
Dated this 3rd day of December 1894.
LYMAN MELVIN JONES.
WILLIAM F. JOHNSTON.