Improvements in Gearing, applicable to Velocipedes and the like.
Year: 1895

page_text: Date of Application, 8th Feb., 1895-Accepted, 27th Apr., 1895
COMPLETE SPECIFICATION.
Improvements in Gearing, applicable to Velocipedes and the like.
I, PIERRE EDOUARD DECHAMPS, of 24 Rue Lafayette, Rouen, in the Republic
of France, do hereby declare the nature of this invention to be as follows:-
The arrangement of gearing described below is not novel in principle, but its
application to the driving wheels of velocipedes and above all my method of
applying it is novel.
According to this invention the chain is replaced by an arrangement of gearing
mounted on the axle itself of the driving wheel, which axle also carries the pedals.
It is placed between the two rows of spokes in such a manner that it in no way
impedes the working of the pedals. This is that which constitutes the novelty
and distinguishes it from the other analogous arrangements hitherto tried.
My system is capable of many variations founded on the same principle. I here
describe three chief arrangements which are shown in the annexed drawings in
which the same letters designate analogous parts in the three arrangements.
The following description is sufficiently clear to enable the mechanism and its
working to be understood.
A is the central driving axis carrying the cranks, and at its centre is the
support A' of the intermediate driving pinion C which it carries along with it in
the same direction.
B is a fixed pinion in one piece with the forks B' B₁ B¹¹¹.
C₁ C' are intermediate driving pinions peculiar to Figure 0. These two pinions
are in one piece and turn on their axis A', which is fixed to the pedal axis A, at
the same time that they rotate round this latter.
D is a gearing up pinion fixed to the box D' which is the hub of the driving
wheel and which directly drives it. The angular speed of this pinion and conse-
quently also of the driving wheel will be the ratio of the fixed pinion B to the
pinion D increased by 1 per revolution of the axis A.
The whole is encased in the hub box D¹ which is hermetically closed but which
may be easily taken apart by means of the screws E.
The only difference which distinguishes the three arrangements based upon the
same mechanical principle is :
1. In Figure 0 there are four conical pinions gearing together two to two.
2. In Figure 1 there are three conical pinions gearing together.
3. In Figure 2 the three conical pinions in the preceding figure are replaced by
three straight pinions gearing together in the same plane, the large fixed pinion
having inside teeth. This arrangement allows a much higher gearing to be
obtained, at the same time greatly reducing the size of the mechanism. Figure 3
is a side view of Figure 2.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed the details of which may
be varied I declare that what I claim is
The application to driving wheels of velocipedes, carriages and the like, of the
mechanism above described, suitable for speed gearing with all the variations and
arrangements based upon the same principle to wit: a system of straight or conical

page_text: gear mounted upon the axis itself of the driving wheel which also carries the
pedals.
Dated this 8th day of February 1895
CARPMAEL & Co.,
Agents.