Improvements in Driving Chains.
Year: 1894

page_text: Date of Application, 19th July, 1894
Complete Specification Left, 18th Apr., 1895-Accepted, 18th May, 1895
Improvements in Driving Chains.
I, EDWARD FRANK SARGEANT, of Linden Villa, Lower Street, Stroud in the
County of Gloucester, Patent Strap Manufacturer, do hereby declare the nature
of this invention to be as follows:-
The primary object of this invention is to reduce the weight of driving chains
especially those having leather links.
In such chains the rivets connecting the links must be of considerable diameter
as they would otherwise cut the leather and having hitherto been made solid are
most unnecessarily strong and heavy.
According to this invention I make such rivets of thin metal formed into tubes.
I further lighten the chain by reducing the sectional area of the links between the
rivet holes thus making the longitudinal strength of the links uniform whereas at
present they are strongest at the middle and weakest across the rivet holes.
In order to make the chain fit the curved surface of the pulley I widen the inner
side of the two ends of the links, the widening being greatest at the sides of the
chain and dying away to nothing in the centre. Should the chain be intended to
work under jockey pulleys, or to drive from both its surfaces, its upper surface can
be fitted to the, pulley in the same manner; this process is also applicable to
thickening the sides of chains intended to work "quarter-twist" or to chains
working on tapered cone pulleys. The middles of the links however are not
widened so that the chain stretches evenly whereas in the shaped chains heretofore
made the middle has always stretched more easily than the sides thus throwing
additional work on the latter.
Deted this 18th day of July 1894.
Improvements in Driving Chains.
I, EDWARD FRANK SARGEANT, of Linden Villa, Lower Street, Stroud, in the
County of Gloucester, Patent Strap Manufacturer, 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 primary object of this invention is to reduce the weight of driving chains
especially those having leather links.
In such chains the rivets connecting the links must be of considerable diameter
as they would otherwise cut the leather and having hitherto been made solid are
most unnecessarily strong and heavy.
According to this invention I make such rivets of thin metal formed into tubes.
I further lighten the chain by reducing the sectional area of the links between the
rivet holes thus making the longitudinal strength of the links uniform whereas at
present they are strongest at the middle and weakest across the rivet holes.

page_text: In order to make the chain fit the curved surface of the pulley I widen the inner
side of the two ends of the links, the widening being greatest at the sides of the
chain and dying away to nothing in the centre. Should the chain be intended to
work under jockey pulleys, or to drive from both its surfaces, its upper surface can
be fitted to the pulley in the same manner; this process is also applicable to
thickening the sides of chains intended to work quarter-twist or to chains working
on tapered cone pulleys. The middles of the links however are not widened so that
the chain stretches evenly whereas in the shaped chains heretofore made the middle
has always stretched more easily than the sides thus throwing additional work on
the latter.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation and Figure 2 a plan of part of a chain constructed
according to this invention. a are the leather or other links of which the chain is
built up,
b are the tubular rivets and c are washers, over which the ends of the
tubes bare expanded..
Figure 3 is a transverse section of part of a modified chain on a pulley d. In
this chain the inner sides of the ends of the links are widened so as to make the
chain fit the pulley.
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. Driving chains formed of links connected together by tubular rivets.
2. Driving chains formed of leather links whose sectional area between the rivets
is equal to or less than that across the rivet holes.
3. Driving chains having the ends of the links widened on one or both sides the
widening diminishing from the sides of the chain inwards to the centre.
4. Driving chains substantially as described and shown in the drawings.
Dated this Eighth day of April 1895.
E. F. SARGEANT.