An Improved Gearing and Frame for Bicycles.
Year: 1896

page_text: Date of Application, 23rd Dec., 1896
Complete Specification Left, 15th Mar., 1897-Accepted, 5th June, 1897
WILLIAM DAVIES Ralph Cottage Abercynon R.S.O. Glam. Blacksmith. I do
hereby declare the nature of this invention to be as follows:-
The patent for which I apply is an improvement in gearing and increase in the
rate of speed of bicycles, and consists of two additional chain wheels B and C on
annexed drawings. They are made together in one piece and work or rotate on
one spindle. The chain from the crank wheel A is carried to and around wheel B.
The chain from wheel C is carried to and around the sprocket wheel D on the rear
or driving wheel of the bicycle. The arrangement of cogs on each of the said.
wheels being made in direct proportion to the rate of speed required.
Also an improvement to the lower part of the frame to allow of fixing and
working the two additional wheels and the necessary working parts. The outer
portion E. E. of the frame being removeable to allow of taking off the double cog
wheels, B & C. without interfering with any other part. Also an arrangement by
means of a slot and nuts for tightening or slackening the front chain. The back
chain to be tightened in the usual way.
Dated 21st day of December 1896.
WILLIAM DAVIES.
An Improved Gearing and Frame for Bicycles.
WILLIAM DAVIES, Blacksmith 1 Ralph Cottage Abercynon R.S.O. Glam.
1 WILLIAM DAVIES 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 :-
An improvement in the gearing and speed of bicycles is made by using two
additional chain wheels B and C. on drawings. They are made together in one
piece and work on one spindle. The chain from the crank wheel A is carried
round the wheel B. The chain from wheel C is carried round sprocket wheel D
on back driving of the bicycle. The arrangement of cogs on each of the wheels
being made in direct proportion to the speed required. Also an improvement in
the lower part of the frame to allow of fixing & working the two additional chain
wheels.
The lower portion of a bicycle frame is the fork in which the back wheel turns..
The portion of the fork on the right hand side (or on the left hand side if
preferred) looking towards the head of bicycle-is cut away & in place thereof
two pieces of steel or wrot iron (bent to required shape) E. E. and F. F. are
bolted to the frame as shown on the drawings.
A slot about 2 inches long is cut in the centre of each of the last named
pieces, as shown on elavation. The double cog wheels B and C work together on.
[Pmine 821

page_text: the spindle (with the usual ball, cone & cup-bearings). The both ends of this
spindle are screwed for nuts, these ends are placed through these slots & the nuts
are then screwed on the projecting ends of spindle which come through the slots.
The cog wheels & the spindle will slide forwards or backwards at will by
unscrewing the nuts & pulling the spindle & wheels to the required position for
elackening or tightening the chain. When in position the nuts are screwed up &
the spindle fixed.
The letters B. C. and the like refer to the drawings sent with the Provisional
Specification.
Having now particularly described & ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The two additional chain cog wheels B & C and the manner of their use, for
the purpose of increasing or decreasing speed.
2. The improvement in the frame as shown on the drawings and the removeable
portions E E and F. F. for taking off the above named wheels without interfering
with the rest of the frame.
3. The slot arrangement for tightening the front chain being an ordinary slot
of the required size in the portions E. E. and F F, the spindle being tightened as
described.
Dated December 23rd 1896.
WILLIAM DAVIES.