Improvements in Driving and Brake Mechanism for Vehicles.
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 Comptroller General of the 8th day of March 1897.
Date of Application, 14th Sept., 1896-Accepted, 7th Nov., 1896
COMPLETE SPECIFICATION (AMENDED).
Improvements in Driving and Brake Mechanism for Vehicles.
I, CARL SCHMIDT, of Karthäuserstrasse, Erfurt, Thuringia, Germany,
Manufacturer, 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 vehicle-brake mechanism of the kind constructed and
arranged in such a manner that movement of that part of the mechanism by which
the propelling force is applied, in a direction opposed to the direction necessary for
the propulsion of the vehicle, is utilized for braking the vehicle.
Brake-mechanism according thereto is applicable not only to cycles, but to
vehicles of all kinds.
The accompanying drawings illustrate a brake embodying my improvements, and
designed for a cycle;
Fig. 1 being an elevation,
Fig. 2 a cross-section on the line 5-6 of Fig. 4,
Fig. 3 a cross section on the line 3-4 of Fig. 4, and
Fig. 4 a vertical section on the line 1-2 of Fig. 3.
As shown, the driving-wheel consists of a toothed ring t and a rimmed spider t³,
which are connected together loosely in such a manner that the ring t¹ can turn
partially around the spider 2. The crank k is connected by means of the
crank-axle a with the spider 2. Screws vv fixed in the toothed ring t¹ project
with their free ends into guide-slots t³ in the rim of the spider t2. The screw of
the toothed ring extends through the rim of the spider t' and engages therein,
with a certain amount of play, and its inner end is adapted to abut, as hereinafter
described, against the terminal projection h of the brake-band f. The other end o
of the brake-band fis connected to an eye w of the spider 2. The brake-disc bis
fixed on the crank-axle bearing. The operation of the mechanism is as follows: -
When the cycle is being moved forwards by rotating the axle a in the direction
of the arrow I, the projecting pin-portions of the screws vv fixed in the toothed
ring t, bear against shoulders r of the rim of the spider so that the toothed
ring t¹ is carried round by the spider 2. But when for the purpose of braking,
the crank is reversed and pressed in the direction of the arrow II, the ring th
moves forward in consequence of the momentum of the cycle, and the spider t
remains behind. As a result, the projecting pin-portion of the screws of move
away from the shoulders of the rim of the spider 2, the projection h of the band f
moves nearer to the eye w, and the brake-band f places itself upon and around the
brake-disc b.
This braking action, which is more or less powerful according to the amount of

page_text: the counter-pressure applied to the cranks, is transmitted by means of the
projection to the driving-wheel t¹ and from the latter, through the medium of
the driving-chain and the driven pinion, to the driving road wheel of the vehicle.
As the last mentioned wheel carries about two-thirds of the entire load, the
vehicle is braked in an extremely effective manner.
Having now particularly described and ascertained the nature of the said inven
tion and in what manner the same is to be performed I declare that I know it has
been proposed, in brakes for directly driven mechanism, to arrange the axle or
central part of the wheel and the rim to move independently but concentrically
and to connect them by suitable brake gear so that the brake is automatically
applied when the angular velocity of the one part exceeds that of the other part,
and to this, broadly speaking, I therefore lay no claim, but what I claim is :-
Brake mechanism of the kind referred to in which a rimmed spider t² fixed on
the crank-shaft is provided with a surrounding driving ring t movable thereon and
adapted to bear against a shoulder or shoulders of the spider and thus to
receive the driving power from the latter, the ring t¹ and the spider t being
adapted to engage respectively with the two ends of a brake-band f, substantially as
hereinbefore described with reference to the example illustrated.
Dated this 14th day of September 1896.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.