Improvements in Brake-work for Cycles.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Brake-work for Cycles.
We, WILLIAM ARTHUR LLOYD, Managing Director, and CUTHBERT TUNSTALL,
Works Manager, both of W. A. Lloyd's Cycle Fittings Limited, of Park Street,
in the City of Birmingham, do hereby declare the nature of this invention
to be as follows:-
This invention relates to the brake-work of cycles and has for its object to
provide an improved system of twin or double brake whereby brakes are applied
simultaneously to both the back and front wheels of a machine by the operation
of only one hand-lever, thus obtaining an increase of braking force which is
particularly desirable in connection with cycles having free-wheel gear.
One form of the improved dual brake consists of a hand lever fulcrum to the
handle bar in the usual manner and arranged to depress an ordinary spring-
returned brake rod or plunger, which is fitted with a cross piece having jointed
to it a pair of links proceeding downwardly and adapted to operate the shoes
which are applied to the front wheel. Such shoes may be carried by bell-cranked
levers fulcrumed to clips or like bracket attachments secured respectively to the
opposite sides or blades of the steering fork, with the outer ends of the shoe-
levers being jointedly connected to the outer or lower ends of the long links
proceeding from the plunger rod. Shoes so mounted would be brought to bear
against the inner periphery of the front wheel rim when the plunger is
depressed.
The other part of the mechanism consists of an arm made fast and raking
backwards from the lower end of the plunger, underneath the fork crown and
being flexibly connected to a bell-cranked lever pivoted to a hanger bracket or
clip carried preferably from the front diagonal member of the frame, with the
rearward arm being jointed to an adjustable power-transmission rod, which runs
down the said front diagonal member and is jointedly connected at the bottom to
a swinging arm hung from the bottom bracket or adjacent part of the frame.
This swinging arm transmits the movement of the transmission rod to another
rod terminating in a forked or stirrup-shaped frame saddling a part of the rear
wheel, and with the ends of its branches being jointedly connected to a pair of
levers or arms swinging from clips or like attachments on the chain stays and
having at their lower ends, brake blocks which are drawn into braking contact
with the rim of the back wheel simultaneously with the application of the other
pair of brake blocks on the front wheel rim.
The setting of the brake shoes relative to the rims to which they are to be
applied may be affected by adjustably connecting them to the arms or levers by
which they are carried.
The invention may also be applied to operate simultaneously a pair of tyre
brakes by so arranging the hand lever that the brake rod or plunger is lifted
when the said lever is raised, and so arranging the bell-crank or equivalent arms

page_text: that they move in the opposite directions to those previously described, thus
bringing the brake blocks down onto the tyres instead of closing them inwards
against the wheel rims.
Dated this 18th day of Santambar 1890
WILLIAM ARTHUR LLOYD.
CUTHBERT TUNSTALL.
By Henry Skerrett,
Agent for Applicants.
We, WILLIAM ARTHUR LLOYD, Managing Director, and CUTHBERT TUNSTALL,
Works Manager, both of W. A. Lloyds Cycle Fittings Limited, of Park Street,
in 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 relates to the brake work of cycles and has for its object to
provide an improved system of twin or double brake whereby brakes are applied
simultaneously to both the back and front wheels of a machine by the operation
of only one hand-lever, thus obtaining an increase of braking force which is
particularly desirable in connection with cycles having free wheel gear.
Figure 1 of the accompanying drawings represents an elevation of a cycle
fitted or provided with double brake mechanism constructed and arranged
according to my invention, whereby a pair of rim brakes are applied simul-
taneously to the front and back wheels of a cycle, through the medium of a
single operating lever on the steering handle bar.
Figures 2 and 3 represent, upon an enlarged scale, separate views of the
front wheel brake, the one view showing the brake shoes in their normal or
inoperative position and the other shows the parts in the positions they assume
when the brake is applied to a wheel.
Figure 4 is a view, partly in elevation and partly in section, showing the
arrangement of the means employed for communicating motion from the. rod
which operates the front wheel brake to the system of levers and connecting
rods by which the rear-wheel brake is actuated.
Figure 5 represents an underside plan showing the disposition of the whole
of the rear-brake mechanism.
The same letters of reference indicate corresponding parts in the several
figures of the drawings.
This form of the improved dual brake consists of a hand lever a, fulcrumed
to the handle bar 6, of the bicycle in the usual manner and arranged to depress
an ordinary spring-returned brake rod or plunger e, which is fitted with a cross
piece e, having jointed to it, a pair of links d, proceeding downwardly and
adapted to operate the shoes c, which are applied to the inner periphery of the
rim of the front wheel f. Such shoes are carried by bell-cranked levers c¹,
fulerumed to clips or like bracket attachments secured respectively to the
opposite sides or blades of the steering fork with the outer ends of the shoe-
levers being jointedly connected at e, to the outer or lower ends of the long
links d, proceeding from the plunger rod. Shoes so mounted are brought to
bear against the inner periphery of the front wheel rim when the plunger is
depressed.
The other part of the mechanism consists of an arm g, made fast to and

page_text: raking backwardly from, the lower end of the plunger rod, underneath the fork
crown 3, and being flexibly connected to a beli-cranked lever pivoted at h¹ to
a hanger bracket or clip carried preferably from the front diagonal frame
member . The said connection between the arm g, on the plunger rod and
the lever may be effected by forming slots g, h; in their overlapping ends
working in common over a guide peg 7, depending from the underside of the
fork-crown, the arrangement being such that motion is transmitted from the
plunger to the bell-crank lever in whatever position the front forks are turned
to for steering.
The rear arm, of the lever h, is jointed at ³, to a power-transmission rod i,
which runs down the said front diagonal member and is jointedly connected at
the bottom end it, to a swinging arm j, hung from the bottom bracket f³, or
adjacent part of the frame. This swinging arm conveys the movement of the
transmission rod to another rod k, terminating in a forked or stirrup-shaped
frame m, saddling a part of the rear wheel f6, and with the ends of its branches
being jointedly connected to a pair of levers or arms n swinging from clips or
like attachments on the chain stays and having at their lower ends, brake
blocks o, which are drawn into braking contact with the rim of the said back
wheel fo when the brake lever a is actuated, simultaneously with the applica-
tion of the other pair of brake blocks on the front wheel rim..
The setting of the brake shoes relative to the rims to which they are to be
applied may be affected by adjustably connecting them to the arms or levers by
which they are carried.
The invention may also be applied to operate simultaneously a pair of tyre
brakes by so arranging the hand lever that the brake rod or plunger is lifted
when the said lever is raised, and so arranging the bell-crank or equivalent arms
that they move in the opposite directions to those previously described, thus
bringing the brake blocks down onto the tyres instead of closing them inwards
against the wheel rims.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
First A dual or double brake, operated by a single hand-lever, for simul-
taneously retarding both the front and back wheels of a cycle, substantially as
herein described, and also as set forth in the accompanying drawings.
Secondly-A dual or double brake, operated by a single hand-lever, for
simultaneously retarding both the front and back wheels of a cycle, and com-
prising a lever-actuated plunger or rod for operating the front wheel brake, and
a jointed connection, by which motion is communicated from the said plunger
to a system of levers and connecting rods for operating the rear wheel brake,
substantially as herein described, and also as set forth in the accompanying
drawings.
Thirdly A dual or double rim brake, operated by a single hand lever, for
simultaneously retarding both the front and rear wheels of a cycle, and com-
prising a pair of front wheel brake blocks carried on jointed levers and operated
by means of a lever-actuated plunger or rod through the medium of jointed
links, and a rear wheel rim brake to which motion is communicated through the
medium of an arm on the plunger, a bell-cranked lever pivoted to the frame
and rocked by the said plunger arm, a connecting rod proceeding from the lever
to a swinging arm also pivoted to the frame, and a second connecting rod
directed from the arm to the stirrup or frame of the brake, the whole being
arranged and operating substantially as herein described and set forth in the
accompanying drawings.
Fourthly: In brake mechanism for cycles, communicating motion from a
lever-operated plunger to a rear-wheel brake by an arm or extension of the said
plunger acting upon one arm of a bell-cranked lever pivoted to the frame of

page_text: the cycle, with the other arm being jointed to a rod leading to the brake, and
with both the plunger arm and the first-named arm of the lever being jointed
or flexibly connected to one another by a guide rod depending from the crown
of the steering forks, substantially as and for the purpose herein described and
also as set forth in the accompanying drawings.
Data the 19th love of Anvil 1000
WILLIAM ARTHUR LLOYD.
CUTHBERT TUNSTALL.
By Henry Skerrett,
24, Temple Row, Birmingham,
Agent for Applicants.