Improvements in Driving Ropes for Cycles.
Year: 1895

page_text: Date of Application, 5th Nov., 1895
Complete Specification Left, 4th Aug., 1896-Accepted, 19th Sept., 1896
TROY IDIONAL
Improvements in Driving Ropes for Cycles.
1 BIRGER LJUNGSTRÖM of 44B, Grefgatan, Stockholm, in the Kingdom of
Sweden, Mechanician, do hereby declare the nature of this invention to be as
follows:-
The driving mechanism of velocipedes or cycles very often consists of treadles
or levers, which, by means of ropes, are connected to ball or roller ratchet clutches
on the nave or the shaft of the driving wheel. This invention relates to an
improved rope for the said purpose. This rope is made in such a way, that a
number of thin steel wires are twisted together, so as to form a rope, around which
is wound or coiled a thicker wire, protecting the inner rope from wear, without
impairing its flexibility.
The coil may be single or double, that is to say, it may consist of one wire, or of
more wires wound one beside the other. The former arrangement is to be
preferred, as the rope with more than one surrounding wire will become somewhat
stiff. A special advantage in the described wire rope consists in the fact that it
may easily be made thinner or thicker at any desired point along its length, only
by making the coils smaller or larger where required. Such a widening of the
rope may be useful, in order that the rope may have a good bearing upon the
pulley.
1
NT
100%
NEWTON & SON,
Agents for the Applicant.
Improvements in Driving Ropes for Cycles.
I, BIRGER LJUNGSTRÖM, of 448 Grefgatan, Stockholm, in the Kingdom of
Sweden, Mechanician, 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 :-
In the driving mechanism of velocipedes or cycles, the treadles or levers are
frequently connected by means of ropes or cords, to ball or roller clutches on the
Dave or the shaft, of the driven wheel. This invention relates to improvements in
the construction of such driving ropes or cords, these being composed according to
my invention of a core of longitudinally twisted wires forming a rope to take or
bear the tension, the said core being wound with a stouter wire or wires transversely
and helically. The helically wound wire or wires protect the inner rope from wear,
without impairing its flexibility, while at the same time the external diameter is or
may be readily increased, as, and where desired, or required.
My invention will be readily understood by reference to the accompanying
drawing whereon at Fig. 1 is shewn partly in elevation and partly in sectional
elevation a part of a rope constructed according to my said invention Figs. 2 and 3
being transverse sections of same on the lines X Y and X' Y' respectively.

page_text: A is the core formed of a number of (for example steel) wires, twisted together
so as to form a rope, hereinafter termed the core, B is the helically coiled wire
surrounding the core A. This coil, shewn in the drawing as consisting of one wire,
may in some cases be formed of two or more wires wound one beside the other, but
I have found the single wire coil to answer the purpose well, as when two or more
wires are employed the rope becomes somewhat stiff.
As shewn, at parts where it is desired the external diameter of the rope should
be larger, the coil B is wound to a larger diameter as required, and such enlarge-
ment or enlargements may readily be formed at any part or parts in the length of
the rope.
A rope thus constructed is especially suitable for use with pulleys made as
described in the specification of my Patent Application No. 20912 of even date
with this.
The termination of the core A and of the coil B, at each end of the rope may
be soldered or brazed together and fitted with a suitable ferrule. As shewn in the
drawing, and as I prefer, the end of the coil B is enclosed by a ferrule C which
also surrounds the end of the core A. and the whole are soldered or brazed together
while the projecting end of the core A is formed into a knot D. Such a knot D
when the rope is applied to a pulley or pulleys as described in my aforesaid
Specification 20912/95 is adapted to be passed through the slot in the pulley side
and held in a recessed part as there described.
In uniting the end of the rope to the treadle or lever connection the ferrule may
be screwed and the knot need not project.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A driving rope for velocipedes or cycles, composed of a core of twisted wires
extending longitudinally, in combination with a wire or wires wound transversely
and helically around such a core, the said helically windings being increased in
diameter wherever desired or required in the length of the rope whereby the
diameter of the said rope is varied, substantially as and for the purposes set
forth.
2. The combination with the driving rope as claimed by Claim 1; of the
construction of the terminations for same substantially as described.
Dated this 4th day of Avons 1806
BREWER & SON,
London and' Leeds, Agents for the Applicant.
BREWER & SON,
London and' Leeds, Agents for the Applicant.