Improvements in Safety Bicycles, Tricycles, and other similar Velocipedes.
Year: 1891

page_text: Date of Application, 8th Apr., 1891-Accepted, 9th May, 1891
COMPLETE SPECIFICATION.
Improvements in Safety Bicycles, Tricycles, and other similar
Velocipedes.
I, THOMAS COPPOCK, Junior of 448 Stockport Road, Longsight, Manchester
Lancashire Brush Importer, do hereby declare the nature of my invention and
in what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
This invention consists in providing safety bicycles, tricycles and other velocipedes
with an improved arrangement of driving mechanism whereby the driving power of
the machine is increased with the same amount of exertion on the part of the rider
as heretofore.
On the accompanying drawing
Fig. 1 is a side elevation of a safety bicycle with my improvements applied
thereto and
Fig. 2 is a plan view of the hind or driven wheel alone.
Figs. 3 and 4 are side sectional and plan view respectively of my improvements
as applied to a tricycle.
In performing my invention I dispense with the usual chain wheel mounted on
the axle a of the hind wheel a' and substitute therefor a hoop or annular ring b
formed out of cast steel or iron and provided on its outer periphery with two sets of
teeth c and c and which hoop or ring being sufficiently broad projects on both
sides of the machine as illustrated (the spokes being arranged to pass therethrough)
and so constitutes an improved form of chain wheel.
Instead of the cranks and treadles which have hitherto been used on the driving
axled I now employ a pair of chain wheels e. e having the treadle ff affixed to and
projecting from each outside edge thereof as illustrated and which chain wheels are
each connected by a suitable pitch chain to the respective sides of my improved.
chain wheel b and so serve to communicate motion thereto.
My improvements as applied to a tricycle are illustrated in Figs. 3 and 4 an
additional hind wheel being employed in order to apply my improved chain
wheel; the driving wheels and treadles being the same as herein before described
in reference to Figs. 1 and 2.
My improved chain wheel 6 may be formed in one piece or in segments of a circle
or may be split in two parts one half fitting on one side of the spokes and the other
on the other side and both fastened together by any suitable means.
The improved chain wheel b is either supported entirely by the spokes, each spoke
being provided with a screw nut to hold the wheel tightly in position or the wheel
may be supported from the axle a by the arms as illustrated.
Having thus 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 1
claim is :-
:-
1st. In a safety bicycle or tricycle the improved construction and arrangement of
parts constituting my improved driving mechanism substantially as hereinbefore
described and illustrated on the accompanying drawing.
2nd. In a safety bicycle or tricycle the employment of my improved annular ring
or chain wheel and a pair of chain wheels affixed on the driving or treadle axle

page_text: with treadles affixed to the face thereof and connected by pitch chains with said
annular ring substantially as hereinbefore described and illustrated on the accom-
panying drawing.
Dated this 7th doof 1901
JOHN G. WILSON,
Agent for the Applicant.