Improvements in Chain Wheels for the Transmission of Motive Power, chiefly applicable to Velocipedes, Hoisting Machines, Traction Engines, and like Mechanical Purposes.
Year: 1897

page_text: Date of Application, 13th Aug., 1897
Complete Specification Left, 13th May, 1898-Accepted, 2nd July, 1898 .
PROVISIONAL SPECIFICATION.
Improvements in Chain Wheels for the Transmission of Motive
Power, chiefly applicable to Velocipedes, Hoisting Machines,
Traction Engines, and like Mechanical Purposes.
We, WILLIAM KAY, 99, Wellhead Lane, Perry Bar, Mechanical Engineer,
and WILLIAM HENRY WALKER, 2, Frances Terrace, Ambersley Villas, Park Road,
Aston, Mechanical Engineer, do hereby declare the nature of our said invention
to be as follows; -
This our invention for improvements in chain wheels has for its object, to
reduce or minimise the friction of the driving chain in its engagement or gearing
with the chain, wheel.
We will describe our invention as applicable to one of its purposes, the chain
wheel of a velocipede.
We employ the metallic chain wheel, and the teeth thereon constructed as
hitherto, but each tooth we slot or open sufficient to receive a small metal roller,
having a hole in its centre, and each side of each tooth has corresponding holes,
so that when the rollers are placed in the slots of the teeth, a pin is passed through
one side of the tooth and through the roller; and then through the other side of the
tooth, the ends of the pin being closed over and the rollers secured, but working
freely. The position or setting is such that each roller projects slightly on each
inner side of each tooth of the wheel, and just where the chain pressure finds its
bearing when in motion (instead of the blocks coming in contact with the teeth
of the wheel as hitherto) it will be seen that the friction is greatly reduced and
the driving effected with greater case.
Dated 13th August 1897
Improvements in Chain Wheels for the Transmission of Motive
Power, chiefly applicable to Velocipedes, Hoisting Machines,
Traction Engines, and like Mechanical Purposes.
We, WILLIAM KAY, 99, Wellhead Lane, Perry Bar, Birmingham, Mechanical
Engineer, and WILLIAM HENRY WALKER, 2, Frances Terrace, Ambersley Villas,
Park Road, Aston, Birmingham, Mechanical Engineer, do hereby declare the
nature of our said invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:
Our invention is here described as applied to one of its many purposes, the
chain wheel of a velocipede.

page_text: The metallic chain wheel and the teeth thereon are constructed as hitherto but
each tooth we slot or open sufficiently to receive a small metal roller having a
hole, and each side of each tooth has a hole to correspond, a pin is passed through
these holes and upon this pin the roller moves with freedom. The setting of
each roller is such that it projects slightly on each side of each tooth and in that
position where the chain finds its bearing when in motion, and by these means
friction is reduced and the driving power assisted.
And in order that our said invention may be more fully understood, we shall
now proceed more particularly to describe the same and for that purpose we shall
refer to the several figures on the sheet of drawings hereunto annexed, the same
letters of reference indicating corresponding parts throughout all the figures.
Figure 1 is a side view elevation of chain wheel applicable for a velocipede,
and constructed according to our invention.
Figure 2 is a sectional view of Figure 1.
Figure 3 are parts detached from Figure 1.
Figure 4 is a side view elevation of a chain wheel as Figure 1 but with a
modification.
Figure 5 is a sectional view of Figure 4.
Figure 6 are parts detached from Figure 4.
In Figures 1, 2, 3, a is the chain wheel for a velocipede provided with teeth
as beach tooth being slotted as c and each of said teeth having a small hole.
d is a metal roller, with hole corresponding to the holes in each tooth, and placed
in the slots c, the said rollers d working in the described position upon the pins
as e, which are fixed by closing over the ends.
Figures 4, 5, 6 are substantially the same as Figures 1, 2, 3 but with the
modification or addition of the bush f which is compressed or permanently
affixed to the pin e and upon which the roller d works freely.
By referring to the teeth 6 in Figures 1 and 4 it will be perceived that each
roller d is set so that it projects slightly on each side of each tooth of the wheel,
this is where the chain pressure finds its bearing when in motion and by the
arrangement of parts as above set forth the friction is reduced.
While we have described the features of our invention, and the object we have
attained, and shewn upon the sheet of drawings, we may vary or modify the same
without departing from the principle of our said invention.
Although we have described our invention as applied to a velocipede the same a
is applicable to chain wheels for various mechanical purposes.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that what
we claim is :-
66
In improvements in chain wheels for the transmission of motive power chiefly 4
applicable to velocipedes, hoisting machines, traction engines and like mechanical
purposes."
1. In a chain wheel, the slotted teeth b, with metal rollers & working upon the
pins e, substantially as shewn and for the purpose set forth.
2. In a chain wheel, the slotted teeth b with metal rollers d working on the 4
bushes fixed upon the pins e substantially as shewn and for the purpose set
forth.
3. The general construction and combination of parts in a chain wheel sub-
stantially as hereinbefore described and illustrated by the drawings.
Dated 13th May 1898