Year: 1899

page_text: Date of Application, 29th June, 1899
Completa Caarifination Loft 20th Ann 4000
Aaronted and luna
4000
I, NATHAN ELLINGTON BOYD, M.D., of Kilmarnock House, Kenley, in the County
of Surrey, Editor, do hereby declare the nature of this invention to be as follows:
My invention relates to brakes for cycles and to that class of brakes known as
rim brakes, the object of my invention being to provide a brake which will obviate
the liability of the braked wheel being suddenly locked against rotation as is
now frequently the case when a rim brake is quickly applied.
According to my invention the brake shoes or surfaces instead of being adapted
to press directly upon the rim are each provided with one two or more rollers
of india rubber or other material which are adapted to roll upon the rim and also
when two or more are used, more or less in contact with each other so that as
all the rollers rotate in the same direction the contact with the adjacent roller
or rollers will tend to check the rotation.
In practice the rollers adjacent to each side of the rim are mounted upon
spindles in a box or casing in such a manner that they project from the side of
the casing nearest to the rim the said boxes being carried by a fork which
straddles the rim and can be operated to bring the rollers into contact therewith.
The axles carrying the rollers may be fixed in the boxes or adapted to slide
in guideways therein. In the former case the contact between the several rollers
will only take place when a certain amount of pressure is applied whilst in the
latter case the rollers will travel more or less in the guideway when rotating in
contact with the rim and thus bear against one another with greater or less
pressure.
When I arrange only a single roller in each box I make the said box internally
more or less of the shape of the roller so that as the brake is applied the roller
will come into contact with the walls of the recess in which the roller runs.
I can if desired apply brakes made in accordance with my invention to both
wheels, and provide for operating such brakes either simultaneously or inde-
pendently.
I, NATILAN ELLINGTON BOYD, M.D., of Kilmarnock House, Kenley, in the County
of Surrey, Editor, do hereby declare the nature of this invention and in what
Price 8d1

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:―
My invention relates to brakes for cycles and to that class of brakes known as
rim brakes, the object of my invention being to provide a brake which will obviate
the liability of the braked wheel being suddenly locked against rotation as is
now frequently the case when a rim brake is quickly applied.
According to my invention the brake shoes or surfaces, instead of being
adapted to press directly upon the rim, are each provided with one, two or more
rollers of india rubber or other material which are adapted to roll upon the rim
under more or less friction to check the rotation.
In the accompanying drawing,—
Figure 1 is a side elevation shewing a portion of a cycle provided with a brake
in accordance with my invention, each brake shoe being provided with two brake
rollers.
Figure 2 is a sectional view looking in the direction of the arrow Figure 1;
and
Figure 3 is a longitudinal section through one of my brake shoes:
Figure 4 is a side elevation similar to Figure 1 illustrating an arrangement
wherein one brake roller only used in each brake shoe; and
Figure 5 is a modified arrangement wherein two brake rollers are used.
Similar letters of reference indicate corresponding parts in the several figures.
a indicates the steering wheel fork of a bicycle, & the rim of the wheel carried
in the said fork and c is a fork which straddles the wheel and which serves for
applying my brake by means of a rod c¹ connected by links to the crown of the
fork a.
As shewn in the drawing the said fork is represented as being provided
with prongs d, d pivoted at their upper ends to a cross bar e and at their lower
ends to cradles or boxes f. f in which the rollers g, g of the brake, which are
designed to come into contact with the inner periphery of the rim, are carried
in such a manner that, when the said fork is raised, the brake rollers will
be moved into contact with the rim with greater or lesser pressure.
In the drawings the cradles carrying the rollers g, and which are arranged on
opposite sides of the rim as clearly shewn in Figure 2, are represented as being
formed of two plates h, h held apart by distance pieces i, i and as being at one
end pivoted upon a stud and at the other end connected to one of the prongs d
of the fork c, the studs j, j, upon which the cradles are thus pivoted, being
formed upon brackets or clips k, k clamped upon the side bars of the wheel fork a.
The rollers g, g. which the cradles carry, are freely mounted upon axles 1, 1,
preferably of hardened steel, and having square ends, working in slots m, m
in the cradle-sides h, h and holding the said axles against rotation. Surfaces are
provided against which, when the cradles are drawn towards the rim to press the
rollers into contact with the latter, the said rollers will bear with more or less
friction, the slots m, m permitting of the necessary movement of the rollers
relatively with the cradle. In practice I prefer that the surfaces against which
the said rollers bear, should be in the form of small rollers n, n carried on suitable
axles between the side plates h h as clearly shewn in Figure 3. In the arrangement
shewn in Figures 1, 2 and 3 the rollers g, g are arranged in connection with only
two of such rollers n, n and the slots m, m in which the rollers g, are capable
of moving, are inclined towards each other and the said rollers g, 9 are in contact
so that the more forcibly the rollers g, g are pulled against the rim the greater
will be the friction between the said rollers g. 9 and the greater the degree of
pressure with which they bear upon the rollers n, n.
9 only
In the arrangement of my invention shewn in Figure 4, a single roller
is arranged in connection with each cradle, the said roller being arranged .to
run in connection with two friction rollers n, n.
In the arrangement shewn in Figure 5, the rollers g, g, instead of being in
contact as shewn in Figure 3, are arranged in connection with an additional

page_text: roller against which the said rollers both bear. In this case the slots m, m,
in which the axes of the rollers g, g are carried, are made parallel.
Although I have described my brake as arranged in conjunction with the front
wheel of a bicycle, it is to be understood that it can also be applied to the back
wheel or to both wheels.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what
I claim is-
1. A cycle brake wherein a roller or rollers is or are mounted in a cradle on
each side of a wheel rim, the said rollers being supported in the cradle in such
a manner that they can move therein in a direction towards or away from the
wheel rim so as to permit of the said rollers being pressed more or less into
contact with the surfaces supporting the said rollers, substantially as described.
2. In a cycle brake of the kind referred to in the preceding claiming clause,
the combination with the cradles of small rollers upon which the braking rollers
are supported and against which they will act with more or less pressure when
the brake is applied, substantially as described.
3. A cycle brake of the kind described in the preceding claims, wherein the
cradles carrying the rollers are pivoted at one end and at the other end con-
nected to rods, levers or the like, for moving the said cradles relatively with the
wheel rim, substantially as described.
Dated this 30th day of Auril 1900.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.