An Improvement applicable to, the Driving Gear of Bicycles and other Velocipedes.
Year: 1895

page_text: Date of Application, 22nd Apr, 1895
Complete, Specification Left, 17th Sept., 1895-Accepted, 12th Oct., 1895.
An Improvement applicable to, the Driving Gear of Bicycles
and other Velocipedes.
I CHARLES DAVIES of 18 Park Road Oldham, in the County of Lancaster,
Commercial Traveller, do hereby declare the nature of this invention to be as
follows:
This invention relates to an improvement applicable to the chain gear used for..
driving bicycles and other velocipedes, the objects of the invention being to protect..
the chain, from dust and dirt, and at the same time, to keep it well up to its work and
prevent it from shaking and rattling.
The invention consists principally, of an endless elastic hand or tape (preferably of
india rubber) about three times the width of the driving chain, or wider if preferred,
and of such a length that it requires a certain amount of stretch to place, it round
the chain,.
IT
1.
This endless band is preferably made thicker at the edges so that when stretched -
round the chain it not only encloses it on the outside and travels with it, but becomes
arched in transverse seation so as to ride always freely on the chain, partially
enclosing the sides and having no tendency to ride off sideways.
This endless elastic band not only protects the driving chain from dust and dirt
but it also keeps it firmly in place and prevents it from rising on the teeth of the
"sprocket" wheels, thereby avoiding all jerking of the chain and preventing it
from shaking or rattling.
Dated this 20th day of April 1895
>
COMPLETE SPECIFICATION.
2
"An Improvement applicable to the Driving Gear of Bicycles
and other Velocipedes.
I CHARLES DAVIES of 18 Park Road Oldham, in the County of Lancaster,
Commercial Traveller, 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 relates to an improvement applicable to the chain gear used for
driving bicycles and other velocipedes, the objects of the invention being to protect
the chain from dust and dirt and at the same time to keep it well up to its work
and prevent it from shaking and rattling, or from mounting on the cogs of the
sprocket or chain wheels.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference to
the sheet of drawings hereunto, annexed and the following explanation thereof.

page_text: Fig. 1 on the drawing is a side elevation of the chain driving gear of a bicycle
showing the application of my invention thereto, and
Fig. 2 is a vertical section through the line AB in Fig. 1; a and b are the two
sprocket wheels and c the driving chain.
The invention consists principally of an endless elastic band or tape d (preferably
of india rubber) about three times the width of the driving chain c, or more or less
as preferred and of such a length that it requires a certain amount of stretch to
place it round the chain..
This endless band d'is preferably made thicker at the edges so that when stretched
round the chain c it not only encloses it upon the outside and travels with it but
becomes, arched in transverse section (as shown at Fig. 2) so as to ride always freely
on the chain c travelling round therewith partially enclosing the sides and having
no tendency to ride off sideways.
Sometimes I make the endless elastic band of the form shown in transverse section
at Fig. 3 or if it be desired to enclose the chain entirely the sides may be made
deeper as shown at Fig. 4, and if preferred it may be made thicker at the centre
as shown by the dotted lines. Or the same may be made of other similar arched
or trough shaped forms in cross section.
This endless elastic band is simpler in every respect than a gear case and is more
efficient and has less liability to get out of order.
It covers three sides of the chain and is easily applied and removed. It not only
protects the driving chain from dust and dirt but guides it in a perfect track
keeping it firmly in place and preventing it from rising on the teeth of the
"sprocket" wheels, thereby avoiding all jerking of the chain and preventing it.
from shaking or rattling. The india rubber or other elastic material of which the
endless band is made is preferably so prepared as to be unaffected by oil or
grease.
"
!
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
The construction and application to the driving chain of a bicycle or other
velocipede, of an endless elastic protecting band (of an arched or trough like form
in cross section) placed outside the chain and travelling round therewith substantially
as hereinbefore described and illustrated by the drawings annexed.
Dated this 16th day of Cantambou 1005
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.