Improvements in Brakes for Velocipedes.
Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Chief Examiner of the 22nd day of December 1897.
Date of Application, 28th Sept., 1896-Accepted, 21st Nov., 1896
COMPLETE SPECIFICATION (AMENDED).
Improvements in Brakes for Velocipedes.
I, ARTHUR VEITCH WHITE, of Vansittart Avenue, Woodstock, Ontario, in
the Dominion of Canada, 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:--
This invention relates to certain improvements in strap and drum brakes for
velocipedes, especially to that type which is put into operation by exerting a
retarding pressure on the driving cranks.
In the accompanying drawing:-
Figures 1 and 2 are views in front and back elevation respectively of a brake
embodying my improvements, and
Figure 3 is a view-partly in section on line x x Figure 1.
Throughout the views similar parts are marked with like letters of reference.
The brake consists essentially of a drum A-the particular construction of which
will hereinafter be more particularly described-which is formed on or attached to
the oase or barrel X of the pedal-crank axle bearing, or to any convenient part of
the frame of the machine adjacent thereto, and of a strap B one end b of which is
pivotted to the driving chain wheel C and the other end b' of which is pivotted to
the driving crank D, the chain wheel C being loosely mounted on the boss of the
crank D, and the crank itself being fixed to the pedal crank axle Y. The chain
wheel C is attached to the crank D by means of three studs d passing through slots c
in the chain wheel, one of the said studs being carried by the crank and the other
two by arms D₁ forming extensions thereof. Motion is transmitted from the
crank D to the chain wheel C by the studs d engaging with the ends of the slots
in the chain wheel the said slots allowing the crank to have a small predetermined
free radial movement apart from the chain wheel.
To keep the brake strap B in a central position with respect to the drum A.
the studs d are so located that their heads d form stops against which the said
strap rests when the brake is out of action as shown by Figure 2. The brake
strap B is made of tempered spring steel of a considerable thickness as shown in
order that it may not come into contact with the drum by the inability of the rider
to lift his legs on the upstroke of the cranks.
Instead of lining the brake strap with leather to take the friction as is usual,
I face the periphery of the drum A with leather, fibre or other material in the
following manner: The periphery of the drum A is formed with one fixed side
flange such as a and a loose side flange such as a which is attached to the flange a
by means of transverse screws such as a. Between these flanges are clamped a
series of annular washers a3 stamped or cut out of leather, fibre or other suitable

page_text: material. By this construction the grain of the leather or fibre is presented to the
wearing surface, whereby its life and durability is materially increased.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I would have it under-
stood that I am aware of the Specification of Patent No. 16043 A.D. 1893 granted
to John Gardner and I do not claim anything described or claimed therein but I
declare that what I claim is:-
(1.) In a strap and drum brake adapted to be put into operation by exerting a
retarding pressure on the driving cranks, forming the driving connection between
the crank and the chain wheel by means of three or more studs carried by the
crank and adapted to pass through and engage with slots in the chain wheel, the
said studs being adapted to form stops to retain the brake strap in a central
position with respect to the brake drum, as set forth.
(2.) In a strap and drum-brake, forming the frictional surface of the drum, of a
series of annular washers of leather or fibre clamped between flanges on the drum,
in the manner and for the purpose set forth.
T: +1 J. Cantant..... 1907:
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.