Cycle Brake.
Year: 1896

page_text: Date of Application, 20th June, 1896-Accepted, 8th Aug., 1896
Cycle Brake.
I, REINHOLD HINZE, Architect of 47 Fopengasse at Dauzig in the Province of
Prussia and Kingdom of Prussia, Empire of Germany 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:-
The above-named invention is a brake apparatus for cycles, by which the brake
handle now in use is rendered unnecessary.
The working of the latter not only strains the hands, but also, by the sudden.
setting in motion of the brake, the cyclist is always in danger of a serious fall.
For the new brake, which works pneumatically, an air pump is used; this at the
same time serves for pumping the air into the pneumatic tyres of the machine, so:
that the cycle thereby suffers no appreciable increase of weight.
In the accompanying drawing
Fig. 1 represents the cycle furnished with the new apparatus,
Fig. 2 represents the actual brake on an enlarged scale, while
Figs. 3 and 4 shew details.
The brake, by which the brake block 6 is actuated consists essentially. of a press
or brake cylinder B connected with the driving cylinder A of the cylinder. C
situated outside D and containing the starting piston and an, auxiliary air pump, P.
close to the right guide bar handle and connected with the cylinder C by a tube.
(Fig. 3 and 4).
The brake cylinder B is moveably fastened to the under frame tube and supports
in the inside the piston c whose rod is also detachably joined by the hinge d to the
arm e bearing the brake-block b.
A weak spring continually presses the pole against the bottom separating the
driving and brake cylinders, in which there is a valve o.
The piston k of the driving cylinder is weighted by a similar spring; its rod
bears a small roller r on its outer end. A channel leads from both the driving and
brake cylinders to the starting cylinder C arranged outside them, in which the
starting piston k lies, when not employed, pressed by a spring always against the
opening of the channel s leading to the driving cylinder.
Directly connected with the starting piston is a valve for letting the waste air
out of the brake cylinder. From the starting cylinder an air tube, already alluded
to, leads to the auxiliary air pump P, whose piston is also weighted by a spring.
In addition to this the cylinder of this pump contains yet another air escape
valve.
On the treadle axle a double cam D is made fast, which turns uniformly with the
treadles.
Its importance will be explained later on.
The apparatus works as follows:
By the repeated downward pressure of the auxiliary air pump's piston its spring
is again driven up by the diminishing of the pressure against it, so that the air in
the tube and also in the starting cylinder C is condensed and by the pressure of the
same the starting piston pushed back so far that the passage leading to the driving
cylinder opens itself.
Through this the condensed air arrives in the driving cylinder A behind
the spring and pushes it forwards together with the little roller r. The latter
comes thereby within reach of the double brake D; the latter during its rotation

page_text: pushes back the small roller and with it the piston k and thus drives the compressed
air through the valve into the brake-cylinder.
This compressed air forces the piston c and the piston rod of the brake cylinder
forwards and in consequence of this turns the lever e so far, that the brake block b
is brought close to it and so firmly pressed against the brake disk S, situated
on the back wheel axle, that the cycle is almost instantaneously brought to a
standstill.
If an air escape valve situated in the pump P is now opened, the pressure in the
air tube is reduced and the spring in the starting cylinder presses its piston so
far back, that the air passage o, leading outwards is opened and o on the contrary
closed.
In consequence of this the compressed air in the brake-cylinder B is let off
through o, and the spring f in the brake cylinder presses the piston c with its rod t
so far back, that the brake block 6 by the pressure of the lever e no longer is in
contact with the brake disc.
The same apparatus, altered as occasion, requires, can be applied to all other
vehicles.
Having now particularly described and 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 :
A brake apparatus for cycles, thereby distinguished, that by means of an air
pump P fixed to the guide bar handle compressed air is forced into a driving
cylinder A and from this, through the pressure of the piston k, which travels up
and down by means of a cam D and a spring moving backwards and forwards in
front of the brake cylinder's piston c, is conducted as far as a brake block b. This
is joined to a lever e by the piston rod t of the piston and is firmly fixed to the
brake-disk S.
Dated this 16th day of June 1896.
For KEINHOLD HINZE,
Bernh.
Brockhues.