Improvements in Driving Gear for Velocipedes.
Year: 1898

page_text: Date of Application, 9th Apr., 1898
Complete Specification Left, 30th Dec., 1898-Accepted, 1st Apr.,
1899
PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Velocipedes.
I, JOHN SHAW, of 28, Rosehill Terrace, Willington-on-Tyne, in the County of
Northumberland, Ironfounder, do hereby declare the nature of this invention to
be as follows:
My invention relates to improvements in driving gear for velocipedes.
It consists of gearing wheels, chain, drums for chain, and a double bottom
bracket.
The object of my invention is to lighten, and reduce the friction on chains
and to give more power in driving the machine.
The gear wheels are so constructed that crank wheel is toothed around inside
of rim, fixed on crank spindle. And a pinion wheel toothed around outside of
rim, working inside of crank wheel, fixed on another spindle in front of driving
or rear wheel of machine on which there is fixed a drum with rollers or studs
for chain to ride over. Also another drum with rollers or studs fixed to hub of
driving or rear wheel of machine.
The said driving gear wheels are provided with tapered concave and convex
teeth and so arranged that they can be adjusted, when required.
The chain for same is single and double linked or can be made double linked
throughout, with a stud between to keep them apart. And five eights pitch from
center to centre of each link, concaved on top and bottom. And provided with a
projecting tooth at the said centres, to make a deeper concave in every other link,
which drops in front of said rollers or studs in drums when, in motion.
The crank is attached to rim of said gear wheel when fixed in position, pres-
sure on pedal on end of crank causes the said drums to revolve. and the said
projecting tooth in chain at the said centres, comes in contact with each roller
or stud in said drums and sets the whole machine in motion.
The ordinary chain and small sprocket wheel can be applied to the said driving
gear, when required instead of the said chain or drums.
11000
Improvements in Driving Gear for Velocipedes.
I, JOHN SHAW, 28, Rosehill Terrace, Willington-on-Tyne, Northumberland,
Ironfounder, 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:-
-
Mr invention relates to improvements in driving gear for velocipedes. It

page_text: consists of gearing wheels, chain, drums, for chain, and a double bottom
bracket.
The object of my invention is to lighten and reduce the friction on chains,
and give more power in driving the machine.
The said driving gear wheels are provided with tapered concave and convex
teeth, and so arranged that they can be adjusted when required by the crank
being screwed up.
The said chain is single and double linked, or can be double linked throughout
with a stud between to keep the sides of the links a part. Each link is 5% of
an inch pitch from centre to centre, concaved on top and bottom, and every
alternate link is provided with projecting teeth, to form a deeper concave to drop
in front of said rollers or stud, when the machine is in motion.
The said drums are provided, with rollers or studs, for chain to ride over, and
made any size to suit the gearing required, to drive a velocipede. The double
bottom bracket is provided with two cases for crank spindle and counter shaft for
pinion wheel to revolve in on ball bearings, and sockets for stay tubes.
DESCRIPTION OF DRAWINGS.
In the accompanying drawing,
Fig. 1, is a side view of gearing wheels, drums, and chain.
Fig. 2, is a top view of gearing wheels, drums, and chain.
Fig. 3, is a top view of double bottom bracket and sockets for tubes.
Fig. 4, is a side view of toothed wheel rim and pinion.
Fig. 5, is a side view of crank and arms. A is the crank wheel rim. B the
pinion wheel C is the crank and arms. D and D are the chain drums. E is
the double bottom bracket F is the chain. G and H are the appliances for adjust-
ing the gear wheels when required.
The gearing wheels are so constructed, that crank wheel A is toothed around
inside of rim. The pinion wheel B is toothed around outside. Working inside
of crank wheel A fixed on a counter shaft, in double bottom bracket E in, front
of rear or driving wheel of machine, on which there is fixed the drum D, with
rollers or studs for chain F to ride over. Also another drum DI with rollers or
studs for chain F fixed to hub of rear or driving wheel of machine. The crank
and arms C are attached to the crank wheel rim A. The teeth of said gearing
wheels are provided with tapered teeth and so arranged that they can be adjusted
when they wear, by the gland G and screw bolt H, the gland G is made to fit
into the square hole in crank, and screwed through for bolt H. And space is
provided between the pinion B and arms C, gland G and the end of crank shaft,
as the bolt H is screwed through the gland into the end of shaft, by this means
the said wheels can be adjusted.
When fixed in position pressure on pedal at end of crank, causes the said chain
to revolve over the said drums, by the projecting teeth in chain coming in con-
tact with said rollers or studs in said drums and sets the whole machine in motion.
The said drums can be made any size for the said chain to suit the gearing
required. If required the said driving gear wheels can be adapted, and fitted to
any ordinary chain, by simply retaining small sprocket wheel on hub of rear
wheel. And fixing another one similer on the counter shaft in double bottom
bracket.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, declare that what
I claim is:-
1st. The concave and convex tapered tooth wheel gearing, which can be adjusted,
when required.
2nd. The chain single and double linked or double linked throughout with
projecting teeth at the centres, and rides on alternate links.
3rd. The drums with rollers or studs, for links of chain to ride on.

page_text: 4th. The double bottom bracket for counter shaft and crank spindle to revolve
in.
5th. The driving gear for velocipedes, constructed substantially as described
with reference to the drawings and operating as and for the purpose specified.
Dated 29th day of December 1898.
JOHN SHAW.