Improvements in connection with Back-pedalling Brake Mechanism for Cycles.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in connection with Back-pedalling Brake Mechanism
for Cycles.
I, CHARLES THOMAS BROCK SANGSTER, General Manager of the Cycle Com-
ponents Manufacturing Company Limited, of Bournbrook, near the City of
Birmingham, do hereby declare the nature of this invention to be as follows:-
This invention has relation to back pedalling cycle-brake mechanism for use
in connection with machines have "free" rear or driving wheels, and has for
its object, to provide a simple and efficient arrangement of brake mechanism
adapted to operate a brake adapted to exercise retarding pressure upon the rim
of the free wheel.
The brake is operated by the act of the rider back-pedalling, through the
medium of a suitable clutch arranged in conjunction with the pedal crank
axle and acting to operatively connect with the said axle, a ring or band having
an eyed lug or ear from which a jointed link proceeds rearwardly for a short
distance under one of the chain stays and terminates in one arm of a double
armed lever arranged for the purpose of transmitting the movement imparted
to the said band and link. to a forked rod or double armed frame bridging the
wheel and connected to the swinging arms which carry the brake blocks.
The first-named arm of the double-armed lever depends from one end of a
sleeve or bearing through which is directed a joint pin, supported at its ends by
ears carried by a bracket or attachment clip, disposed between and secured to
the inward portions of the chain stays. Also depending from the sleeve, at or
near the middle thereof, is the second arm, which thus rocks in common with
the first one and has jointed to its lower end, a connecting rod, which is ad-
justably connected by screwing to a cross piece or the like of a forked frame or
yoke; the arms or branches of which come respectively upon the opposite sides
of the wheel and at their rearward terminations are jointed to a pair of swinging
arms or levers, each of which may be fulcrumed to a detachable and adjustable
clip embracing one of the chain stays and has at its forward edge or other con-
venient part, a shoe provided with a contact block of suitable material, adapted
to bear upon an opposite part of the wheel rim when the double armed fever
is, rocked and the branched frame drawn forward on the rider back-pedalling.
To relieve the brake and take the several parts back to their normal positions
a spring is provided, one end of which is connected to any suitable moving
element of the mechanism, and the other to a fixed part of the framing.
L
1 th: 07th day of June 1899
JJ

page_text: Improvements in connection with Back-pedalling Brake Mechanism
for Cycles.
I, CHARLES THOMAS BROCK SANGSTER, General Manager of the Cycle Com-
ponents Manufacturing Company Limited, of Bournbrook, near the City of
Birmingham, 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 relation to back pedalling cycle-brake mechanism for use
in connection with machines having
free"
rear or driving wheels, and has
for its object, to provide a simple and efficient arrangement of brake mechanism
adapted to operate a brake for exercising retarding pressure upon the rim of
the free wheel.
Figure 1 of the accompanying drawings represents a side elevation of a
"free-wheel" bicycle fitted or provided with a back-pedalling rim-brake con-
structed and arranged in accordance with my invention.
Figure 2 represents, upon an enlarged scale, an underside plan of the brake,
showing more clearly the arrangement of the mechanism.
Figure 3 is another view of the said brake, showing the same partly in
elevation and partly in longitudinal vertical section.
Figure 4 represents a transverse vertical section of Figure 2 upon the dotted
line, showing the arrangement of the swinging levers carrying the brake
shoe.
Figure 5. is a further transverse vertical section of Figure 2, but taken on
the dotted line 2, and looking in the direction of the arrow, showing in elevation
the double armed lever device or rocker for transmitting movement from the
crank axle clutch to the brake.
The same letters of reference indicate corresponding parts in the several
figures of the drawings.
The brake is operated, by the rider back-pedalling, through the medium of
a clutch a, of the "Morrow" or other type arranged in conjunction with the
pedal crank axle 6 and acting to operatively connect with the said axle, a ring
or band a¹, having an eyed lug or car a from which a jointed link or connect-
ing rod d, proceeds rearwardly for a short distance under one of the chain stays
and terminates in the depending arm e', of a double-armed rocker e arranged
for the purpose of transmitting the movement created by the back pedalling
action to a forked rod or stirrup frame f, bridging the wheel g and connected
to the swinging arms h¹ which carry the brake blocks h.
The said rocker is made in the form of a sleeve or hollow axis 2, turning
about a transverse joint pin e³, supported at its ends by ears j¹, carried by a
bracket or attachment clip j, disposed between and secured to the chain stays k
preferably in a position immediately behind the crank axle bracket, as best
seen in Figure 3. In addition to the arm or lever e¹, the said rocking sleeve is
provided, at or near the middle thereof, with a second depending arm e, which
rocks with the first one and has jointed to it at e, a connecting rod f¹, which is
adjustably secured, by screwing, to the return end of the forked frame or
stirrup f, the sides or branches f, of which come respectively upon the opposite
sides of the wheel and at their rearward terminations f³, are jointed to the pair
of swinging arms or levers h¹, each of which is fulcrumed at h² to a detachable
and adjustable clip h³ embracing one of the chain stays and has at its forward
edge or other convenient part, a shoe h provided with a contact block h, of

page_text: suitable material, adapted to bear upon one side of the wheel rim g', when the
stirrup frame is drawn forward by the motion set up by a rider back pedalling,
and transmitted from the clutch ring a', to the intervening rocker, and thence
to the connecting rod of the said stirrup.
To relieve the brake and take the several parts back to their normal positions
a spring m is provided, one end of which is connected to any suitable moving
element of the mechanism, such as the arm e', and the other to a fixed part of
the framing, whilst in order to preserve the several parts in their proper normal
positions during forward pedalling, the arm e¹ of the rocking connection is
extended into a stop i, which takes an abutment against the connection clip j,
(see Figure 3) and thereby prevents any excessive backward spring movement
of the brake blocks away from the rim in consequence of the action set up by
the contraction of the spring.
Instead of employing a double armed rocking connection between the clutch
and the brake frame, as herein before described, the same may have only a
single arm to which both the connecting rod d, and the transmission rod f',
are attached, the former being, if necessary, cranked sufficiently to bring it
into line with the said single arm and transmission rod.
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
First: A back-pedalling rim brake for "free-wheel" cycles, comprising a
clutch in connection with the pedal crank axis, a forked frame carrying or
being connected with the brake shoes, and a rocking or levering connection for
transmitting movement, set up by the rider back pedalling, from the said clutch
to the brake, the whole being arranged and operating substantially as herein
described and also as set forth in the accompanying drawings.
Secondly: A back pedalling rim brake for free wheel cycles, having a clutch
in connection with the crank axle and a forked frame carrying or being con-
nected with the brake shoes, and a double armed rocking connection secured
to the framing of the machine, with a rod from the clutch connected to the one
arm, and a transmission rod proceeding from the other arm to the brake frame,
the said rocker thus serving to transmit motion, set up by the rider back-pedal-
ling, from the clutch to the said brake whilst a stop on the said connection
preserves the parts in their normal positions during forward pedalling, substan-
tially as herein described and also as set forth.
001
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