Improvements in Bicycles.
Year: 1895

page_text: being date of first Foreign Application (in 11th Nov., 1895
France),
Date of Application (in United Kingdom), 20th Dec., 1895
Complete Specification Left, 12th Sept., 1896-Accepted, 24th Oct., 1896
France),
Date of Application (in United Kingdom), 20th Dec., 1895
Complete Specification Left, 12th Sept., 1896-Accepted, 24th Oct., 1896
Improvements in Bicycles.
We, ARTHUR DUREY, of 84, Rue d'Hauteville, Paris, France, and LOUIS
SCHREINER, of 19, Rue de Belleville, Paris, France, Velocipede Manufacturers,
do hereby declare the nature of this invention to be as follows:-
This invention has for its object to enable a safety-bicycle to be readily
converted into a tandem-bicycle or a tandem into a triplet, and so on, and to
enable the machine to be returned to its original form without injury to the
appearance of the machine.
Reference is to be had to the accompanying drawings, forming part of this
specification, wherein
Figure 1 represents a safety bicycle converted into a tandem bicycle for two
riders.
Figure 2 is a section shewing the means whereby the spindle of the rear wheel is
prolonged to receive pedal cranks.
a is an extension of the upper member of the diamond-frame supported at its
front end in the socket 6 of the seat pillar mounted in the socket c and at its rear
end by being hinged to a fork d whose lower ends are fixed upon the extensions e
of the rear wheel spindle. The clamp g of the front saddlefis fixed upon the end
of the extension bar a while the rear end of said bar has a socket j to receive the
pillar of the saddle h. The bar a is also provided with an intermediate socket /
to receive the pivot of the handle bark which may either be connected with the
front steering handle by a link or be a dummy as shewn. The extensions e of the
rear wheel spindle on which the extra fork d is supported are formed as shewn in
Figure 2. For this purpose upon each of the screw threaded ends m of the spindle
is screwed a tubular nut n upon which is pivoted the socket o of a lever arm p
upon which socket is also fixed another lever arm g forming the pedal crank arm
the two arms p, q, forming an elbow lever. The lever arm p is connected to the
corresponding front pedal's by means of a rod r so that motion will be transmitted
from pedal crank g, to pedal crank s, the length of the lever arm p relatively to
the crank s and the relative position of the front and rear pedals being such that
the rear pedal which is only capable of upward and downward oscillation through
an arc of 45 degrees will assist the front crank at the dead point and so equalize
the motion. The connecting rods when placed as shewn work in compression but
if it is desired they should work in tension it is only necessary to reverse the
position of the levers so that the levers are upwards. The connecting rods are
made in two parts sliding one on the other and secured by a set screw t so as to
enable their length to be adjusted to suit the tension adjustment of the driving
chain u.
プ

page_text: In order to reconvert a tandem into a single bicycle it is only necessary to
detach the supplementary bar a, extra rear fork d, pedal cranks q, levers p, and
connecting rods r. The rear saddle pillar is then placed in socket o and there
then only remains to remove the sockets n from the ends of the rear wheel spindle
in order to restore the bicycle to its original form.
In order to avoid changing the saddles as above mentioned, the front saddle may
be fixed vertically by providing it with a shank. The socket 6 would be split and
tightened by a bolt to grip the extension bar a.
Dated this 20th day of December 1895.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
Improvements in Bicycles.
We, ARTHUR DUREY, of 84, Rue d'Hauteville, Paris, France, and LOUIS
SCHREINER, of 19, Rue de Belleville, Paris, France, Velocipede Manufacturers,
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 to enable a safety-bicycle to be readily
converted into a tandem-bicycle or a tandem into a triplet, and so on, and to
enable the machine to be restored to its original form without injury to its
appearance.
Reference is to be had to the drawings accompanying the Provisional Specifi-
cation, wherein
Figure 1 represents a safety bicycle converted into a tandem bicycle for two
riders.
Figure 2 is a section showing the means whereby the spindle of the rear wheel
is prolonged to receive pedal cranks.
i
a is an extension of the upper member of the diamond-frame supported at its
front end in a split socket 6 tightened by a nut and carried by a pillar mounted in
the socket c. The bar a is supported at its rear end by being hinged to a fork d
whose lower ends are fixed upon the extensions e of the rear wheel spindle. The
clamp g of the front saddle fis fixed upon the end of the extension bar a while
the rear end of said bar has a socket j to receive the pillar of the saddle h. The
bar a is also provided with an intermediate socket to receive the pivot of the
handle bar which may either be connected with the front steering handle by a
link or be a dummy as shown. The extensions e of the rear wheel spindle on
which the extra fork d is supported are formed as shown in Figure 2. For this
purpose upon each of the screw threaded ends m of the spindle is screwed a tubular
out n upon which is pivoted the socket o of a lever arm p upon which socket is
also fixed another lever arm q forming the pedal crank arm the two arms p, q,
forming an elbow lever. The lever arm p is connected to the corresponding front
pedals by means of a rod r so that motion will be transmitted from pedal crank.
to pedal crank s and the relative position of the front and rear pedals being such
that the rear pedal which is only capable of upward and downward oscillation
through an arc of 45 degrees will assist the front crauk at the dead point and so
equalize the motion. The connecting rods r when placed as shown work in com-
pression but if it is desired they should work in tension it is only necessary to
reverse the position of the levers so that the levers are upwards. The connecting
rods are made in two parts sliding one on the other and secured by a set screw t so
q

page_text: as to enable their length to be adjusted to suit the tension adjustment of the
driving chain u.
P,
In order to reconvert a tandem into a single bicycle it is only necessary to
levers
detach the supplementary bar a, extra rear fork d, pedal cranks
and
9,
connecting rods r. The rear saddle pillar is then placed in socket c and there
then only remains to remove the sockets n from the ends of the rear wheel spindle
in order to restore the bicycle to its original form.
The forms, details, materials, and dimensions of these convertible bicycles may
be varied without in any way departing from the spirit of the invention.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we-
claim is :-
1. The combination, with a bicycle, of an extension bar of the frame supported
at its front end in the front seat pillar and at its rear end by an extra fork
fixed on the rear wheel spindle, and of pedal cranks and lever arms oscillating in
tubular extensions of the said spindle and coupled by links to the front pedals,.
substantially as and for the purpose specified.
2. In a tandem bicycle, the combination, with the main pedals revolving about
the driving crank spindle of supplementary pedals carried by bell crank levers
oscillating about prolongations of the rear wheel spindle and coupled to the
revolving pedals by connecting links, substantially as specified.
Dated this 11th day of September 1896.
A. M. & WM. CLARK,
53 Chancery Lane, London, Chartered Patent Agents.