Improvements in Chain Gearing.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Chain Gearing.
I, EMILE LOUIS TOURNET Engineer 19 Cavendish Road Birmingham do
hereby declare the nature of this invention to be as follows:-
Every alternate link (a) is open on the one side to allow the other links to be
hooked on, leaving only enough space for the links (b) to work freely.
The wheels are slotted for the links (a) to run in.
Dated this 2nd day of June 1896.
I, EMILE LOUIS TOURNET Engineer 19 Cavendish Road Birmingham do
hereby declare the nature of this invention to be as follows:-
Every alternate link (a) is open on the one side to allow the other links b to be
hooked on, leaving only enough space for the links (b) to work freely.
The wheels are slotted for the links (a) to run in.
Dated this 2nd day of June 1896.
EMILE L. TOURNET.
Improvements in Chain Gearing.
I, EMILE LOUIS TOURNET, of 19, Cavendish Road, Birmingham, 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 :-
This invention has reference to chain gearing and consists in constructing and
combining the links of a driving chain as herein described. Driving chains
constructed in accordance with this invention are suitable for use with sprocket
wheels for transmitting power and rotary motion in bicycles and other volocipedes
and motor carriages and other machines and apparatus in which chain gearing
is used.
I will describe my invention by referring to the accompanying drawing on
which
Fig. 1 shews a piece of driving chain constructed according to this invention in
position on the sprocket wheel (which latter forms no part of my invention);
Fig. 2 is a part sectional side elevation of the chain and sprocket wheel;
Fig. 3 is a side elevation and plan of one of the links of the said chain;
Fig. 4 is a side elevation and sectional plan of another of the links of the said
chain;
Fig. 5 is a side view half in elevation and half in section of another form of
sprocket wheel (forming no part of my invention) for use with my improved
driving chain and
Fig. 6 is a side elevation partly in section of the wheel shewn by Fig. 5.
The same letters of reference indicate the same parts in all the figures.
My improved driving chain is formed of a sufficient number of open sided
links A and closed links B engaging together alternately each of the links A
being opened at one side a¹ as shewn so as to allow of the closed links B to be
hooked on to the links A as shewn in Fig. 1 leaving only enough space between
the ends of the links B for these links to work freely. One of the links A is

page_text: shewn separately by Fig. 3 where it will be seen that this link is a flat link made
with a strong side a² and the ends a³ a forined as rounded hooks which project
towards each other leaving an opening a¹ at one side of the link to admit the other
two links B. These links B, as will be clearly seen by an examination of Fig. 4,
are closed links with each end thickened to the proper strength and rounded
to bear against the inner surfaces of the hooked ends as a of the link A.
The chain above described is used on the sprocket wheel as shewn by Figs. 1
and 2 where it will be seen that the solid sides a² of the links A are towards the
centre of the wheel and the open sides a¹ project outwardly, the wheels being
slotted at e¹ for the links A to run in, the other links B lying on the periphery of
the wheel.
My improved driving chain is cheap to manufacture as the links A and B can
by press tools be cut from sheet steel or other suitable metal and suitably rounded
by other press tools of the proper shapes as will readily be understood. The
links of the chain can moreover be very readily unhooked at any part of the chain
and the chain shortened by removing some of the links or lengthened by adding
additional links.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what 1
claim is :-
A gear chain consisting of the open sided links A. and the closed links B linked
together alternately said links being shaped and combined together substantially
as hereinbefore described and illustrated by the accompanying drawing.
Dated this 2nd day of March 1897
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.