Year: 1898

page_text: I; WILLIAM MITCHELL PORT, of 31, Victoria Street, Paignton, in the County
of Devon, Cycle Maker, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in brakes for cycles.
According to the invention I pivot two levers to a suitable part of the frame
of the cycle, the said levers having at one end brake blocks designed to be forced
against the rim of the cycle wheel.
The other ends of the brake levers are connected to an expansible chambér
in such a manner that when the said chamber is expanded the ends of the levers
connected thereto are forced apart so as to press the brake blocks on the other
ends against the rim of the wheel.
For expanding the chamber and applying the brake I connect the said cham-
ber with a suitable device such as a pump whereby air, water or another suitable
fluid can be forced therein under pressure.
1
..
101
1
137
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.
I, WILLIAM MITCHELL PORT, of 31, Victoria Street, Paignton, in the County
of Devon, Cycle Maker, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer
tained in and by the following statement:-
This invention relates to improvements in brakes for cycles.
According to the invention pivot two levers to a suitable part of the frame
of the cycle, the said levers having at one end brake-blocks designed to be forced
against the rim of 'the cycle wheel.
The other ends of the brake levers are connected to an expansible chamber
in such a manner that when the said chamber is expanded the ends of the levers
connected thereto are forced apart so as to press the brake-blocks on the other
ends against the rim of the wheel.
For expanding the chamber and applying the brake I connect the said cham-
ber with a suitable device such as a pump whereby air, water or another suitable
fluid, can be forced therein under pressure,

page_text: In the accompanying drawings-
Figure 1 is a side elevation of the rear part of a cycle frame and of a portion
of the rear wheel shewn provided with a brake constructed according to the
invention:
Figure 2 is a sectional rear elevation thereof:
Figure 3 is a sectional view illustrating a slightly modified construction of
expansible chamber.
a, a are the tubes forming the back stars of the cycle frame and b is a por-
tion of the rear wheel, c, c are the brake levers which are formed of suitable
material, such for example as steel tubing, and are pivoted to clamps c¹, c¹
screwed to the stays a, a forming the rear fork. 2, 3 are the brake-blocks
with which the lower ends of the levers c are provided, the levers being arranged
in such a position that the said brake-blocks ², are opposite the rim of the
wheel b.
As above described the upper ends of the brake levers c, c are connected to an
expansible chamber two constructions of which I have shewn in Figures 1, 2
and 3. In the arrangement illustrated in Figures 1 and 2 the chamber is
formed of an air-bag which is enclosed within two metal cylinders or cups e, e¹
the latter of which fits into, and is adapted to slide in, the former e as clearly
indicated in Figure 2. The ends of the brake levers c, c are pivoted at 3, c
to the outer ends of these cylinders or cups e, el respectively and a spring f.
the ends of which are connected to the two levers at f', f, normally forces
the two ends of the levers together so as to collapse the two cylinders e, e¹ and the
air-bag d.
The air-bag is in connection by a flexible tube g (preferably of india-rubber
and carried up to the handle-bar of the machine) with an air pump having a
flexible bulb fitted with an escape valve h¹.
With this arrangement by compressing the bulb the air chamber dis
expanded, thereby forcing the two cylinders e, el apart and the two brake-
blocks, against the rim of the wheel a so as to brake the cycle. To take off
the brake the air is allowed to escape from the air-bag by pressing the button
of the valve ¹, the spring f then collapsing the air-bag and the cylinders e, e¹.
In the arrangement shewn in Figure 3 the air-bag is dispensed with and
the inner cup or cylinder el is shewn provided with a cup leather valve i so
that when air is forced between the said valve and the outer cylinder e the
two cylinders are forced apart and the brake applied in the manner above
described.
It will be obvious that in lieu of air I may employ water or another suitable
fluid.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
The combination and arrangement of parts forming the improved brake for
cycles, substantially as herein before described and illustrated in the accom-
panying drawings.
Dotad the 14th day of November 1898