Improvements in the Construction of Brakes for the Front Wheel of Cycles.
Year: 1899

page_text: Date of Application, 29th July, 1899-Accepted, 2nd Sept., 1899
COMPLETE SPECIFICATION.
Improvements in the Construction of Brakes for the Front Wheel
of Cycles.
I, RICHARD JEWELL, of Devonshire House, Taybridge Road, Clapham, in the
County of Surrey, Engineer, 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:-
My invention relates to improvements in cycle brakes and has for its object
the construction of a combined rim and tyre brake that can be applied to the
front wheel of any make of cycle including method of attaching foot rests to
the fork clips when desirable.
I will explain the manner of carrying out my said invention with reference
to the accompanying sheet of drawings
In which similar letters refer to similar parts in each figure.
Fig. 1, is a back elevation.
g, g, Fig. 1, are clips attached to the front fork D, D, said clips carry the
fulcrums c, cl, to which the bell-crank levers c, c, are attached and upon which
they work. The short arms of said levers c, c, are set at such an angle that the
indiarubber blocks, a, a, held by the shoes a¹, a' on end of the said short arms
of levers c, c, will come into frictional contact with the rim, C, Fig. 2, when
the brake is in operation.
The ends of the long arms of levers c, c, are pinned a working fit to the ends
of the stirrup iron d, at, d', d¹, Figs. 1, 2, 3.
On the underside of the crown of the said stirrup iron d, I fasten a detachable
shoe m, to carry an indiarubber block, b, Figures 1, 2 said block comes into
frictional contact with the tyre B when the brake is in operation-see Fig. 2.
A reference to Figures 1, 2, 3 will shew the foot rests hh, that when desirable
I cast upon the clips g,g.
Fig. 1, shews the stirrup iron d, drawn up towards the fork crown of the
cycle and the blocks, a, a and b clear of the rim, C, and the tyre B respectively.
And by reference to Fig. 2, it will be seen, that when the said stirrup iron, d,
is pressed in a downward direction the said blocks, a, a, b, will come into frictional
contact with the rim, C, and tyre B, respectively.
The device I employ to actuate the stirrup iron d, in the necessary upward
and downward direction for releasing and putting on the brake is as follows
A rod, c, secured to the crown of the stirrup iron, d, runs through the bore
of the fork stem E, said rod is held concentric with the fork stem E by bore
of fixed collar, n, and enlargement at the top of rod, e, the spiral spring, i,
wound round the rod, e, is held in compression between the collars, n, n', the
object of the said spring, i, is to automatically release the brake by pulling the
stirrup iron, d, in an upward direction, Fig. 1. The clip, k, Fig. 1, attached to
the handle bar, F, carries the pin upon which the fulcrum of the lever, j, works
the rounded end of the short arm of said lever, engages the slot, f, cut in the
enlargement at the top of the rod, e, an opening has to be made in the handle

page_text: bar stem to allow the said rounded end of the lever, j, to reach the before-
mentioned slot, f.
The action of the brake is as follows
The compressed spiral spring, i, seated on the fixed collar, n, and working
against the collar, n', attached to the rod, c, Fig. 1, pulls the stirrup iron, d,
in an upward direction, so automatically releasing the brake, as herein before
explained.
To apply the brake the long arm of the lever, j, Fig. 1, is pulled in an upward
direction towards the handlebar, F, when the short arm of the said lever, j, will
actuate the rod, e, at, f, forcing the rod, e, and the stirrup iron, d, in a downward
direction, so bringing the indiarubber block, b, into frictional contact with the
tyre, B, and actuating the bell crank levers, c, c, at d', d', by forcing the long
arms of said levers in a downward direction when the indiarubber pads, a, a,
Fig. 2 attached to the short arm of bell crank levers, c, c, by the shoes a', a', will
come into frictional contact with the rim C, of the front wheel being set at a
suitable angle from the fulcrums c¹, c', as herein before explained.
The grip of the brake is of course regulated by the manipulation of the
lever, j, Fig. 1.
I sometimes telescope the rod, e, above the collar, n¹, into a sleeve on the
enlargement at top of said rod, e, and so adjust the said rod to any desired
length, fixing sleeve and rod together by set screw.
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:.
1. In combination with a cycle the device for a combined rim and tyre brake
substantially as herein described and shewn in the accompanying sheet of
drawings.
2. In combination with a cycle brake the fulcrum pin and foot rest clips
attached to the front fork, for carrying the bell crank levers also the said bell
crank levers substantially as herein described and set forth in the accompanying
sheet of drawings.
3. In combination with a cycle brake the device for a stirrup iron to which
can be fitted the detachable tyre brake and the long arms of the bell crank levers,
for the purpose specified, substantially as herein described and set forth in the
accompanying drawings.
4. In combination with a cycle brake the rod running through the interior of
the fork stem connecting the stirrup iron and brake lever, also spiral spring
on said rod for the purpose specified as herein described and set forth.
Dated this 20th day of Tulu 1900
W. H. GREATOREX,
Agent for Applicant.