Year: 1887

page_text: Date of Application, 24th Dec., 1887
Complete Left, 21st June, 1888
Complete Accepted, 27th July, 1888
I PERCY DAVID HEDDERWICK of No. 10 Heathfield Road, Acton in the County
of Middlesex, Engineer do hereby declare the nature of this invention to be as
follows:-
:-
When a flexible strap is drawn close round the brake drum of a velocipede or
other vehicle in order to retard or stop its revolution, this is usually done by pulling
the one end of the-strap while the other end remains fixed. Although this is effective
when the drum revolves in one direction it is apt to be inefficient when the drum
revolves in the opposite direction, the friction then tending to draw the strap in
opposition to the pull applied to it, and so loosening the brake strap. My invention
relates to means of connecting and working the brake strap whereby it is rendered
efficient whether the brake drum revolves in the one direction or the other. For this
purpose I connect both ends of the brake strap to the brake lever or pull in such a
manner that when this lever or pull is moved, only one end of the brake strap is.
moved by it, the other end bearing against a fixed stop against which it is drawn by
the friction of the strap on the drum acting in the direction of the drum's revolution.
Each end of the strap being thus provided with a stop, according as the drum
revolves in the one direction or the other, the one or the other end of the brake strap
becomes for the time a fixture while the other end is moved with the brake lever or
pull tightening the brake.
That this 24th day of Docomber 1887
ABEL & IMRAY,
Agents for the Applicant.

page_text: Improvements in Brakes for Velocipedes and other Vehicles.
I, PERCY DAVID HEDDERWICK of No. 10 Heathfield Road, Acton, in the County
of Middlesex, 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 :-
When a flexible strap is drawn close round the brake drum of a velocipede or other
vehicle in order to retard or stop its revolution, this is usually done by pulling the
one end of the strap while the other end remains fixed. Although this is effective
when the drum revolves in the one direction, it is apt to be inefficient when the drum
revolves in the opposite direction, as the friction in that case tends to draw the strap
in opposition to the pull applied to it, and so loosens the brake. My invention
relates to means of connecting and working the brake strap in such a manner that it
is efficient whether the brake drum revolves in the one direction or the other. For
this purpose, I connect both ends of the brake strap to the brake lever or pull in
such a manner that when this lever or pull is moved straining the strap, only one
end of the brake strap is moved by it, the other end being drawn and made to bear
against a fixed stop by the friction of the strap on the drum acting in the direction of
the drum's revolution. Each end of the strap being thus provided with a stop,
according as the drum revolves in the one direction or the other, the one or the
other end of the brake strap becomes for the time a fixture while the other end is
moved with the brake lever or pull away from its stop, tightening the brake.
Figs. 1, 2 and 3 of the accompanying drawings are diagrams illustrating my
improvements and Figs. 4, 5 and 6 are side views of parts of Brake drums or wheels
with several modified arrangements according to my invention of the connections to
the brake strap. In these figures the same reference letters are employed as far as
possible to indicate corresponding parts. A is the brake wheel or drum, B is the
Hexible brake strap having its two ends C and D, which usually are pin joints serving
to connect the strap to the fixed stop and to the pull respectively. As indicated in
Fig. 1 the two ends C and D are connected together by a chain or flexible band E
passing over a pulley mounted on the pull P. According as the drum A revolves in
the one direction or the other, the one or the other of the two pins C or D is brought
against a fixed stop c or d the other of the two pins being drawn away from its stop
by the strain of the pull P. As indicated in Fig. 2 the two ends C and D of the
brake strap are jointed to two arms of a T lever F to the third arm of which the
pull P is connected. Instead of a T lever, a straight lever may be used as indicated
by the line F. As indicated in Fig. 3 the two ends of the brake are attached to the
ends of a lever L having the pull P attached to its middle,
In the arrangement shewn in Fig. 4 instead of a pull, a pushing rod P is jointed to
the long arm of the T lever F and the brake strap is jointed to its short arms at C
and D. The stop for C is at the end c of a slotted hole in the supporting frame G,
and the stop for D is at the edge of the frame at d. In the arrangement shewn in

page_text: Fig. 5 the pull P is jointed to about the middle of a lever L the one end of which is
connected by a link H to the one end D of the brake, strap the other end being
jointed to one arm of a lever K which is pivotted at k on the fixed frame G. The
other arm of the lever K is jointed to the end C of the brake strap, and the lever K
has a tail which abuts at c on the tubular part V of the fixed frame, this abutment
constituting the stop for the end C of the brake strap. The pin D finds its stop at d
the end of a slotted hole in the frame G. In the arrangement shown in Fig. 6 the
pull P is jointed to about the middle of a bent lever L, one arm of which is connected
by a link E to the brake end D, the other arm by a link M to a strap N which
passes partly round the tubular part V of the frame and is jointed to the brake end C.
The stops for C and D are respectively the ends c and d of slotted holes in the fixed
frame G.
Although I have shewn arrangements of brakes of a form suitable for velocipedes,
modified arrangements might be made suitable for other vehicles.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
:-
Connecting both ends of a flexible brake strap to the brake pull, and providing for
each of those ends a fixed stop so arranged that, whether the brake wheel or drum
revolves in the one direction or the other, there is one of the ends of the brake strap
strained against its stop while the pull strains the other end away from its stop,
substantially as and for the purpose herein set forth.
Dated thin 14 daw at Tun 1000
ABEL & IMRAY,
Agents for the Applicant.