Improvements in Velocipedes.
Year: 1892

page_text: Date of Application; 22nd Feb., 1892
Complete Specification Left, 12th Dec., 1892-Accepted, 22nd Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Velocipedes.
1, CHARLES DE SALLIER-DUPIN, of 95 Boulevard Beaumarchais, Paris, Doctor,,
do hereby declare the nature of this invention to be as follows:-
This invention has for its object a new arrangement permitting the gearing of a
velocipede to be instantaneously altered, in such a manner that if each turn of the
pedal axis communicates a number of turns V to the driving wheel of the cycle,
the cyclist can instantaneously change the speed making the rear wheel turn V + Vi
times for each turn of the pedal axis.
My invention can be applied to bicyclettes, tricycles, quadricycles &c.
In applying my invention to bicyclettes I mount upon the pedal axle two chain
wheels of the same diameter which by two chains drive two chain wheels on the
axis of the driving wheel. These two chain wheels are of different diameters and
are loose on the axis turning on balls placed in circular grooves formed in the nave
of the wheel.
In order to drive sometimes through one and sometimes through the other of
these two chain wheels, I employ a two pronged locking bolt placed round the nave
of the wheel and turning with it. The two prongs of this locking bolt are con-
nected by a disc which can be shifted to the right or left by a bell crank lever
acting on its edge or by other suitable mechanism. When this disc is shifted to the
right the locking bolt engages in holes formed in a flange of one of the chain wheels,
and when shifted to the left the locking bolt disengages from the holes of the one
chain wheel and engages in the holes of the other chain wheel. Suitable springs
prevent the bolt from disengaging from the holes by the vibration of the machine.
In applying my invention to tricycles &c. the bolt is placed upon the nave of the
rear wheel between the two carrying wheels and between the moveable chain
wheels. In all these machines, bicycles, tricycles &c., the double bolt may be
placed on the pedal axis the chain wheels being either of different or of like
diameters the chain wheels on the rear axle in the latter case being of different
diameters.
Dated this 22nd day of February 1899
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Velocipedes.
I, CHARLES DE SALLIER-DUPIN, of 95 Boulevard Beaumarchais, Paris, Doctor,
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 has for its object a new arrangement permitting the gearing of a
velocipede to be instantaneously altered, in such a manner that if each turn of the
pedal axis communicates a number of turns V to the driving wheel of the cycle, the
cyclist can instantaneously change the speed making the rear wheel turn V + Vi
times for each turn of the pedal axis.
My invention can be applied to bicyclettes, tricycles, quadricycles, &c.
In the annexed drawings,
Figure 1 is an elevation partly in section showing the axle of the driving wheel
of a bicyclette.
Figure 2 is an end elevation of the same axle.
The chain which drives the rear wheel of the bicyclette is generally placed to

page_text: the right of the machine the left side being free. In my new arrangement, I mount
upon the pedal axle two chain wheels of the same diameter which by two chains
drive two chain wheels A A¹ of different diameter mounted on the axis B of the
driving wheel C. These two chain wheels are loose on the axle, and turn on balls
placed in circular grooves which are formed in the nave of the wheel. The chain
wheels are therefore independent one of the other, and the difference of their
diameters will be calculated according to the difference in speed it is desired to
⚫obtain.
In order to drive sometimes through one and sometimes through the other of
these two chain wheels, I employ a double bolt D D¹ placed round the nave of the
driving wheel and turning with it. The two prongs of this bolt are united by a
disc E which has a circular projection e and by actuating the lever F the double
bolt D D¹ is moved to the right or left. Figure 1 shows the double bolt in its
extreme position to the left; it is engaged in two of the poles H H₁H" H"
formed in the flange G of the chain wheel A. The wheel C is therefore driven by
the chain wheel A, the chain wheel A' being loose upon the nave of the wheel and
not being engaged by the double bolt, also turns because it is driven by the right
hand chain, but its motion is not communicated to the driving wheel.
If the bicyclist wishes to change the gear and actuate the driving wheel by the chain
wheel A¹ the diameter of which differs from that of the chain wheel A, he has only
to operate the lever M the upper portion of which is within reach of his hand: by
means of the bell crank lever L K F, the movement of the lever M is transmitted
to the double bolt which slides to the right disengaging the chain wheel A. In
this movement the double bolt goes into two of the holes H H H H formed in
the chain wheel A' and the movement of the pedals is transmitted to the rear wheel
by this chain wheel. A spring m prevents the double bolt from leaving the slots
formed in the chain wheels by the shaking of the machine; this spring may also
be applied to the lever M and in this case by preventing this lever moving from
the shaking of the machine, the same result is obtained.
Any suitable arrangement for moving the bolt may be used.
In the movement of the bolt from right to left shocks are avoided by placing
very weak springs in the holes H H H H
In a similar manner the invention may be applied to tricycles and quadricycles.
In all these machines, bicycles, tricycles, &c., the double bolt may be placed on
the pedal axis the chain wheels being either of different diameters, or of like
diameters, the chain wheels on the rear axle in the latter case being of different
.diameter.
I may employ any suitable method of actuating the double bolt, and I may
mount the disc which connects the two bolts upon balls or otherwise, also I may
place small rollers at the extremity of each prong of the fork to diminish friction
during the short time that the change of gear is taking place.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1. The above described arrangement for instantaneously changing the gearing of
velocipedes and specially characterised by mounting two chain wheels of different
diameters and driven by two chains on each side of the machine; either of these
-chain wheels being capable of being connected with the driving wheel by means of
a bolt actuated by a lever placed within reach of the cyclist.
2. The modification in which the pair of chain wheels of different diameters
are upon the pedal axis there being in this case a pair of chain wheels of equal
diameters fixed upon the axis of the driving wheel.
Dated this 12th day of December 1892
CARPMAEL & Co.,
Agents for the Applicant.