An Improved Chainless Gear for Bicycles..
Year: 1894

page_text: Date of Application, 19th Sept., 1894
Complete Specification Left, 13th June, 1895-Accepted, 13th July, 1895
PROVISIONAL SPECIFICATION.
An Improved Chainless Gear for Bicycles..
I, WALTER ROSE of North End Northallerton, Yorkshire, Machinist, do
hereby declare the nature of this invention to be as follows:-
This invention consists of a train of three wheels namely a cogwheel on the
treadle axle, which engages with a pinion on another axle placed above or behind
the treadle axle.
Attached to this pinion or on the same axle is a friction wheel the periphery of
which runs in contact with the periphery of the hind wheel of the machine. This
friction wheel is the driving wheel of the gear and its size and that of the first
cog-wheel of the train will depend to some extent on the speed required. The
periphery of this friction wheel may be formed of india-rubber, metal or any other
suitable material to ensure the necessary frictional grip on the tire of the driving
wheel of the bicycle.
By this gear the bicycle can be driven without the usual driving chain and
without any strain on the spokes or hub.
Dated this 19th day of Sentember 1894.
S. S. BROMHEAD,
97 Newgate Street, E.C., Agent for Applicant.
An improved Chamiess Gear for Bicycles.
I, WALTER ROSE of North End Northallerton, Yorkshire, Machinist, 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 is designed to supply a chainless power gear for driving bicycles
which while effective and easy to work shall be free from the disadvantages
inseparable from the ordinary chain gear.
It consists of a train of three or more wheels namely a cogwheel on the treadle
axle engaging with a pinion on another axle placed above or behind the treadle
axle.
Attached to this pinion, or to a second pinion driven by an intermediate cogwheel,
on the same axle, is a friction wheel, the periphery of the hind wheel of the
machine.
This friction wheel is the driving wheel of the gear and its size and that of the
cogwheels and pinions of the train will depend on the speed required. The
periphery of this friction wheel may be formed of india-rubber, metal or any other
suitable material to ensure the necessary frictional grip on the tire of the driving
wheel of the bicycle.
By this gear the bicycle can be driven without the usual driving chain and
without any strain on the spokes or hub.

page_text: I will now describe the invention with reference to the accompanying drawings
in which,
Fig. 1 shows an elevation of a bicycle fitted with one form of my improved
chainless gear namely with one toothed wheel and pinion.
Fig. 2 shows an elevation on a larger scale of a gear with two toothed wheels and
pinions for higher speed.
Fig. 3 shows a plan view of Fig. 2.
Referring to Fig. 1 a is a toothed wheel driven by the pedals b, b.
c is a pinion which engages with the wheel a. d, is a friction wheel mounted on
the same axle as pinion c, serving to drive the cycle by contact with the periphery
of the rear wheel e.
Referring to Figs. 2 and 3, b, b, are the pedals driving the epicycloidal wheel f,
which drives the pinion g, and this pinion drives the larger toothed wheel h,
mounted on the same axle. This wheel h, gears with another pinion i mounted upon
the same axle as the friction wheel j, which in turn drives the rear wheel e of the
bicycle.
Should the friction wheel slip, the rear bicycle wheel may be tightened up to it
by means of the usual forked axle bearing, or other suitable arrangement.
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 :-
A bicycle speed gear consisting of a train of toothed wheels and pinions driven
from the treadle axle, said train operating at any speed required a friction wheel
which engages with the periphery of the driving wheel of the machine, as herein
described and set forth.
Dated this 13th day of June 1895.
S. S. BROMHEAD,
97 Newgate Street, London, E.C., Patent Agent.