Year: 1887

page_text: I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane, in the
County of Middlesex, Fellow of the Institute of Patent Agents, 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 :-
My invention relates to a new and improved drive chain, as will be hereinafter
explained. Fig. 1 is a plan view of my improved chain straightened out in
ordinary working position, parts being broken away. Fig. 2 is an edge view of
Fig. 1 partly in section on the line X X Fig. 1.
b
Fig. 3 is an edge view of two links and a pintle in such position that the pintle
can be removed. Fig. 4 is a perspective view of one of the links detached. Fig. 5
is a perspective view of the pintle. Similar letters of reference indicate like parts
in all the figures. Each end consists of two side bars A A which are united at one
end to a tubular end bar B. The opening through the end bar is circular in cross
section at the part which engages with the pintle when in operation except that at
one side it is provided with an internal longitudinal groove or throat 6 which by
preference is formed at about the point indicated in Figs. 2 and 4. Each of the side
bars A is provided at one end with an opening or pintle seat a which is also circular
in cross section at that part which engages with the pintle when at work, being
notched by preference at that side of the opening which is nearest to the end bar in
order to avoid unnecessary weakening of the link at that end. Each side bar is
constructed at or near one end with a shoulder or offset c and when preferred the
side bars may be strengthened by means of ribs or webs c¹ c¹ upon the outer faces.
The pintle D shown detached in Fig. 5 is round in cross section, except at both
ends where it is provided with projecting spurs or lugs d d.
It will be observed that the pintle seats in both the tubular end bars and the ends
of the side bars are of the same internal diameter and are of a size adapted to fit
closely the pintle, and thus make close joints between the parts and provide a suitable
articulation where the tubular end bar engages with the pintles.

page_text: In consequence of the pintle being locked to the free ends of the side bars A A so
as to be incapable of rotation in its seats a a, it, the pintle, is compelled to rotate
within the end bar B of the adjacent link, whereby there is provided a long wearing
surface between the articulating parts of the chain, which adds greatly to the durability
of the chain.
By an examination of the drawings, it will be readily understood that when the
two links are turned at right angles to each other and in the position indicated in
Fig. 3, the key seats a' and the throat register with each other so that the pintle
can be inserted, the lug on one side passing through the key seats until both lugs
enter the key seats in the side bars so that when the links are straightened out and
those lugs are thereby moved away from juxtaposition with the key seat in the
tubular bar, the pintle is prevented from lateral movement and cannot be withdrawn.
Therefore it is impossible to detach one link from another except when they are
turned into the position shewn in Fig. 3. It will he seen that in consequence of the
ends of the pintles including the spurs d d fitting closely the pintle seats a¹ a¹ and of
the tubular end bar fitting closely between the ends of the side bars of an adjacent
link, dirt is practically excluded from the interior of the tubular end bar, whereby
wearing away at such points is largely reduced, and the durability of the chain and
length of time during which it will properly track the sprocket wheels is corre-
spondingly increased."
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, 1 declare that what
I claim is
1. In a drive chain, links composed of tubular end bars provided with pintle seats
which are circular in cross section and have internal longitudinal grooves and have
side bars formed integral with the tubular end bars and provided with pintle seats in
combination with detachable pintles, each provided at its ends with laterally projecting
spurs adapted to enter the grooves in the pintle seats and to engage with opposite
ends of the tubular end bars, substantially as set forth.
2. In a drive chain, links composed of tubular end bars provided with pintle seats
which are circular in cross section and have internal longitudinal grooves and have
side bars formed integral with the tubular end bars and are provided with pintle seats,
in combination with detachable pintles provided at their outer ends with projecting
spurs and fitting closely the grooved seats in the ends of the side bars whereby dirt is
excluded, substantially as set forth.
Dated this 22nd day of December 1887.
ABEL & IMRAY,
Agents for the Applicant.