Year: 1889

page_text: Date of Application, 26th Jan., 1889
Specification Accepted, 2nd Mar., 1889
We, THE METALLURGICAL PATENTS COMPANY, Limited, of Kirkewhite Street, in
the town and County of the town of Nottingham, Manufacturers of Steel Castings,
and JOSEPH ELTON BOTT, of the same place, Engineer, 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, reference being had to
the accompanying drawings and to the letters and figures marked thereon, that is
to say:
This invention relates to improvements in detachable drive chains, and it has for its
object to so construct the links of such chains as to obviate the weakness inherent
in the well known "Ewart" drive chain which consists of a metallic link in which a
portion is cut away from one of its side bars to allow the hook to slip over and form a
chain, thus weakening the same beyond remedy at its most vital part-namely at the
angle formed on the side bar and near the end of each link.
According to this invention the links are so constructed as to dispense with the
cutting away of the metal of the bars, the connection being made between two links,
by placing the end bar in the slot of the hook when, on its being turned into working
position, the chain has neither lateral nor horizontal movement but, at the same time,
is free to rotate or oscillate on the axis of each link as it travels over and around the
sprocket wheels on which it is working.
And in order that the invention may be readily understood we proceed to describe
the same fully with reference to the accompanying drawings, in which
.
Fig. 1 is a plan of one of the links, Fig. 2 a side view, and Fig. 3 a section taken
on the line A B of Fig. 1. Fig. 4 shews a pair of links, one link delineated as it is
cast, and before bending over to form the hook, the other being closed over at the
hook to form the chain, as is hereinafter described.
On reference to the said drawings, it will be seen that the improved drive chain
consists of a series of links C whose end bars D have a projection E, so constructed as
to drop into the recess F in the hook G, the slot H, formed when the hook G is turned
over being left wide enough for the links to be withdrawn, when the same are placed
at an acute angle, as shewn in fig. 5, to their normal working position.

page_text: The projection E prevents either lateral or horizontal movement of the links C, but,
at the same time, permits the axial movement of each link round the sprocket wheels
this is accomplished by making the curves of the projection E, and recess F, coincident,
whilst owing to the section of the metal being equal, the strains incidental to casting
are equalized, which is not the case in the "Ewart" chain.
Also in the manufacture of the improved links we do not propose to use a sand or
other core to form the slot H and recess F, but prefer to cast the hook vertical to the
axis of the link and, after casting, to turn the same down so as to produce the hook G
and slot H.
It is preferred to construct the links of cast malleable iron or steel.
Having now particularly described and ascertained the nature of the said In-
vention and in what manner the same is to be performed, we declare that what
we claim is
1. In a detachable drive chain, the construction of links having a projection on the
engaging bar and a corresponding recess in the hook, substantially as described and
for the purpose specified.
2. In a detachable drive chain, the formation of the hook of each link without
the aid of a sand or other core, substantially as described as and for the purpose
specified.
Dated this with dose of
1000