Year: 1886

page_text: "
I ANDREW DOBBIN of Dobbinton in the County of Bruce, and Province of
Ontario, Canada do hereby declare the nature of this invention to be as follows:—
The invention has for its object to so construct a horse shoe that there shall be
no "spring" between the toe and heel, and at the same time provide the shoe
with a calk which will give a perfectly even standing surface, and offer a firm
hold upon the ground when the hoof is set down at any angle.
Other advantages to be gained by my invention are the prevention of severe
cutting when the horse "interferes," the ready adaptation of my shoe to contracted
hoofs, facility in nailing and cheapness in first cost.
The improvements consist firstly, in constructing the shoe with a continuous
calk which runs right around the shoe from end to end, said calk having a less
radius than the rim of the shoe proper, and the nail holes passing through the
main bar to the outside of the continuous calk. The inner side of the calk is
concave, and the concavity extends from the lower edge which rests upon the
ground to the inner edge of the bar proper.
The second part of my invention consists in adapting my shoe to contracted.
hoofs by removing enough of the metal of the main bar of the shoe to give it a
spring" at the toe, and combining with same a screwed cross-bar tapped into
both branches of the shoe at the heel, said cross-bar being capable of adjustment -
by a wrench or spanner, and the size of the shoe thus altered.

page_text: I ANDREW DOBBIN of Dobbinton in the County of Bruce, and 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 :-
"
The object of my Invention is to so construct a horse shoe that there shall be no
undue spring between the toe and the heel, and at the same time provide the
shoe with a calk which shall afford a perfectly even standing surface, and allow of
a firm grip upon the ground at whatever angle the hoof may be set down.
Other advantages to be gained by my invention are the prevention of severe
cutting when the horse "interferes," the ready adaptation of my shoe to contracted
hoofs, facility in nailing and cheapness in cost of manufacture.
To this end my invention consists, essentially in a horse shoe having a con-
tinuous calk running right around upon the underside, set in from or having a less
radius than a projecting rim which extends outwards from the main bar at the
upper edge, the nail holes passing through said rim in the angle between it and
the calk, said calk being concave on its inner side.-The shape of the bar formed
as above is an important feature of my invention,-for full comprehension of which
reference must be had to the accompanying drawing forming part of this Specifi-
cation in which similar letters of reference indicate like parts.
In said drawing Figure 1 is a perspective view of my shoe ;-Figure 2, a section
of the bar ;-Figure 3 a plan view of my shoe when arranged for use with con-
tracted hoofs; Figure 4 a longitudinal section and Figure 5 a front view of same,
partly in section.
A is the top or main part of the bar, and B the continuous calk, running from
one heel right around to the other. As will be observed the inner side of this
calk is concave, the concavity b extending from the lower edge of the calk to the
inner edge a of the bar A, the metal being reduced at that point. The outer side
of the calk is by preference slightly convex, and forms an angle with the underside
of the projecting edge or rim a¹ of the main bar; this rim being of suitable thick-
ness and having an approximately square edge as shown.
Usually there will be a slight annular recess or depression a² at the angle of the
rim and calk to receive the heads of the nails which are driven from the outside
of the calk; the nail holes d. d. passing through said rim at this point..
As will be seen clearly in Figure 2 the radius of the outer edge or rim of the
main bar A is greater than that of the lower edge of the continuous calk so that
in cases of "interfering" or "over-reaching" the edge of the calk cannot easily
cut the animals flesh, as any blow which may be struck will be from the rim a¹
which will usually glance off harmlessly.
From the above it will be seen that the bar from which my shoe is made is of
the same section from heel to heel; this enabling me to manufacture a shoe having
all the advantages of others in which there is a continuous calk while producing
same at a less cost owing to the fact that the bar can be rolled through out of the
same thickness, width and depth and then simply cut into lengths which will be
turned or bent to form the shoes,

page_text: And further my continuous calk having the convex outer face combined with
the inner concavity will produce a better standing medium than that attained by
calks of other shapes; and lastly from the fact that my shoe has an internal
concavity of equal area all round, the inside of the bar, "balling" or " filling" is
entirely prevented.
My shoe may be easily adapted for contracted hoofs by filing or otherwise
removing part of the inner edge a of the main bar, so as to lessen the area and
strength of the metal at the toe part, as shown at a³ Figures 3. 4 and 5.
By doing this a spring will be allowed at the toe, and the distance between the
branches of the heel can thus be varied to reduce the size of the shoe.
This I accomplish by arranging between the branches near the heel, a cross bar C,
one end of which may have a head countersunk in one branch, and the other end
screwed into a threaded hole in the other branch. This cross bar passes through
the calk B slightly below the underside of the rim a¹, said calk being reinforced
at the points where the holes come by welding on small pieces 61 6¹ as seen in
Figures 4 and 5.
The cross bar C, has a square or angular piece c³ formed on it between its ends
so as to permit of its rotation by a spanner in adjusting the screw, which is done
when the size of the shoe is to be altered.
My shoe will usually be made of steel, and is formed by any approved process,――
the reduced portion a³ and reinforcements 6' 6' being if desired formed during the
manufacture of shoes intended for contracted hoofs.
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
I claim is
1. A horse shoe made from a bar of equal section from heel to heel, substantially
as and for the purpose specified.
2. A horse shoe made from a bar of equal section throughout, and constructed
with rim a¹ having nail holes passing through same,-continuous calk B of less
radius than said rim, and having its outer face slightly convex and with inner
concavity b extending from lower edge of said calk to internal edge of the bar,
from heel to heel, all substantially as and for the purpose set forth.
3. In a horse shoe, the combination with the continuous calk B, having
the reinforcements b¹ b¹ and with the recess a³ at the toe part, of the stretching
bar Chaving the square or angular piece c³ substantially as and for the purpose
described.
Deted this 19th day of November 1886.