An Improved Brake.
Year: 1892

page_text: Date of Application, 13th Dec., 1892
Complete Specification Left, 9th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
An Improved Brake.
I, JOHN BOYD DUNLOP, of Talbot House, Blackrock, Dublin, in the County of
Dublin, Ireland, Veterinary Surgeon, do hereby declare the nature of this invention
to be as follows:-
My invention has for its objects to produce a brake of simple construction but
efficient in action, and which shall be especially adapted to vehicles such as cycles
having elastic tyres which are liable to be injured seriously by the brakes in
ordinary use.
According to my invention I so construct the brake that one part or two or more
parts thereof can rotate relatively to or upon a fixed part, but in so rotating friction
is experienced which is utilized in stopping the cycle or other vehicle. The said
rotary part or parts is or are caused to turn when brought into contact with the
wheel which is to be braked.
In carrying my invention into effect, I provide a non-rotating cylinder or tube
connected with the brake handle in any suitable manner and adapted to be moved
towards and away from the wheel as is an ordinary brake.
The said cylinder or tube may be made of steel, brass or other suitable material.
Around the said cylinder or tube I mount a tubular jacket of leather, rubber or
other suitable non-metallic material, which can turn on the said stationary tube,
and which is prevented from sliding off the said tube by a collar at each end
thereof or by other suitable means. The leather or rubber tube may be made in
one piece, or of a number of rings or washers placed side by side.
When the brake is applied to the tyre of the wheel the aforesaid rotary part s
caused to turn on the stationary tube, and friction is set up between the rotary and
non-rotating parts, which friction is effective in stopping the wheel.
By this construction the elastic tyre is not injured when the brake is applied
is frequently the case with other forms of brakes, and moreover the brake is very
durable.
Instead of a single tubular rotary piece, or a single row of rings or washers I
may use two or more rotary friction tubes placed one upon the other. I prefer
however to use a single tubular friction piece as above described.
Dated this 13th day of December 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE
SPECIFICATION.
An Improved Brake.
I, JOHN BOYD DUNLOP, of Talbot House, Blackrock, Dublin, in the County of
Dublin, Ireland, Veterinary Surgeon, 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 has for its objects to produce a brake of simple construction but
efficient in action and which shall be especially adapted to vehicles such as cycles
having elastic tyres which are liable to be injured seriously by the brakes in
ordinary use.
According to my invention I so construct the brake that one part or two or more
parts thereof can rotate relatively to or upon a fixed part, but in so rotating friction

page_text: is experienced which is utilized in stopping the cycle or other vehicle. The said
rotary part or parts is or are caused to turn when brought into contact with the
wheel which is to be braked.
In carrying my invention into effect, I provide a non-rotating cylinder or tube
connected with the brake handle in any suitable manner and adapted to be moved
towards and away from the wheel as in an ordinary brake.
The said cylinder or tube may be made of steel, brass or other suitable material.
Around the said cylinder or tube I mount a tubular jacket of leather, rubber or
rubber compound or other suitable non-metallic material, which can turn on the
said stationary tube, and which is prevented from sliding off the said tube by a
collar at each end thereof or by other suitable means. The leather or rubber tube
may be made in one piece, or of a number of rings or washers placed side by side.
When the brake is applied to the tyre of the wheel the aforesaid rotary part is
caused to turn on the stationary tube, and friction is set up between the rotary, and
non-rotating parts, which friction is effective in stopping the wheel.
In the accompanying drawings,
Figure 1 is a side elevation of the front wheel and part of the frame of a bicycle
fitted with my improved brake.
Figure 2 is a front view partly sectional of the brake drawn to a larger scale.
A is the front wheel of the bicycle fitted with a tyre A¹; B is the brake-rod
which is mounted on the frame and operated by a brake lever in the ordinary
manner; B' is the brake proper.
Referring now to Figure 2 the brake rod B is forked at its lower end B2, and in
said forked end is firmly secured a cylinder B3 by means of a bolt and nut C.
On the said cylinder B³ is mounted a sleeve or tubular jacket B of leather, rubber
or rubber compound. The said jacket is prevented from sliding off the end of the
cylinder B by collars B³. I sometimes as above mentioned make the tubular
jacket B' of a number of rings or washers placed side by side.
When the brake is applied the tubular jacket B' is brought into contact with the
tyre and is thereby caused to rotate on its supporting cylinder B³ friction being
set up between the two surfaces which stops the wheel.
By this construction the elastic tyre is not injured when the brake is applied as
is frequently the case with other forms of brakes, and moreover the brake is very
durable.
Instead of a single tubular rotary piece or a single row of rings or washers. I may
use two or more rotary friction tubes placed one upon the other. Or I may use a
metallic rotary tube placed on the outside of the non-metallic jacket the object
being in all cases, when the brake is applied, to produce the desired friction between
metallic and non-metallic surfaces or other dissimilar and gripping surfaces and not
between the brake and the tyre. I prefer however to use a single stationary tube
and a single rotary tubular jacket as described and shown.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A brake in which the portion to be brought in contact with the tyre of the
wheel consists of a tubular jacket or sleeve or two or more such jackets or sleeves
adapted to rotate on a fixed cylindrical part, for the purpose specified.
2. A brake constructed substantially as described with reference to the drawing
and operating as, and for the purpose, specified.
Dated this 9th day of September 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.