Improvements in Brakes for Velocipedes.
Year: 1896

page_text: Date of Application, 28th Nov., 1896
Complete Specification Left, 24th Dec., 1896-Accepted, 20th Feb.. 1897
PROVISIONAL SPEC
Improvements in Brakes for Velocipedes.
I, ARCHIBALD WAYNE DINGMAN of 49, Huntley Street, Toronto, Ontario, in the
Dominion of Canada, hut now temporarily residing at 29, Montague Place,
Bloomsbury, in the City and County of London, Manufacturer, do hereby declare
the nature of this invention which has been cominunicated to me from abroad by
Robert Scott Anderson of Jarvis Street, Toronto, Canada, Machinist, to be as
follows:-
This invention relates to an improved brake for velocipedes, and it consists
essentially of an internal brake drum formed on or fixed to the frame of the machine
concentric with and in close proximity to the sprocket wheel on the driving wheel
or in the case of velocipedes having two driving wheels on the axle carrying the
said wheels, and of an elastic brake strap actuated by the sprocket wheel and adapted
to act within the said internal brake drum when the angular velocity of the said
sprocket wheel is less than that of the driving wheel or axle as the case may be,
the said sprocket wheel being so mounted on the hub of the driving wheel or on
the axle as the case may be that it has a small predetermined rotary movement apart
from the said hub or axle.
A convenient method of construction is the following:-On to the hub of the
driving wheel or on to the axle as the case may be is screwed or otherwise fixed a
sleeve on which is loosely mounted the sprocket wheel which takes the form of a ring
of teeth the exterior shape of the said sleeve being such that it forms a flanged guide
for the sprocket wheel on one side and on the other side it has a small projecting
piece which acts not only as a guide for the sprocket wheel but also as a stop for
the brake strap as will hereinafter be seen. In the web of the sprocket wheel is cut
or formed a slot adapted not only to allow the sprocket wheel to be passed on to the
sleeve beyond the aforesaid projection but also to receive a projecting piece on the
brake strap which takes the form of a flat expanding split ring adapted to lie round
the sleeve with its one end abutting against the projection thereon, and the projection
on its other end fitting in the slot in the web of the sprocket wheel. On to the
end of the hub or on the axle as the case may be outside the aforementioned sleeve,
is screwed-preferably by an opposite thread-another sleeve having a flange adapted
to retain the expanding ring on the sleeve on which it is mounted.
The internal brake drum is formed on or fixed to the frame of the machine con-
centric with and immediately over the expanding ring mounted on the sleeve carrying
the sprocket wheel.
The action of the brake is as follows:-When the angular velocity of the sprocket
wheel on the driving wheel or axle is as great as that of the said wheel or axle the
expanding ring is lying snug against the sleeve carrying it, but when the angular
velocity of the sprocket wheel becomes less that that of the driving wheel or axle,
as is the case when back pressure is exerted on the cranks, the expanding ring is
caused to expand whereby it grips or jambs on to the fixed internal brake drum.
amber 1846
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.

page_text: I, ARCHIBALD WAYNE DINGMAN of 49, Huntley Street, Toronto, Ontario, in the
Dominion of Canada, 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 that type of brake for velocipedes, consisting of a non-
rotating internal brake drum and of an elastic brake ring or strap actuated by the
sprocket wheel and adapted to act within the said internal brake drum when the
angular velocity of the said sprocket wheel is less than that of the driving wheel,
and it consists in certain improvements in the details of construction hereinafter
specified whereby this type of brake is made more effective and is capable of
application to machines already constructed.
In the accompanying drawing which illustrates this invention :-
Figure 1 is a broken view in side elevation showing the improved brake fitted
to the driving wheel of a rear-driving safety bicycle.
Figure 2 is a view in longitudinal section of the brake mechanism on line xx,
Figure 3.
Figure 3 is a view in transverse section on line y y, Figure 2, and
Figure 4 is a view in side elevation with the internal brake drum, the elastic
brake ring or strap, and the outer sleeve removed.
Throughout the views similar parts are marked with like letters of reference.
On to the one end of the hub X of the driving wheel is screwed a sleeve A
having a small flange a on its inner side, and exterior to the said sleeve is screwed
a second sleeve A' having an exterior flange a¹. This second sleeve preferably has
an opposite thread to the sleeve A so that it acts as a lock nut to the said sleeve.
The sleeves A and A¹ form by and between them a bed adapted to receive both
the sprocket wheel B-which takes the form of a web b having a ring of teeth-
and the elastic brake ring or strap C, the said parts being retained thereou by the
flanges a and a'.
On the periphery of the sleeve A is a small transverse projection a' which
extends to within a short distance of the flange thus allowing space for the web b
of the ring of teeth forming the sprocket wheel B. This projection a² also acts as
a stop against which one end of the brake strap C rests. In the web b of the
sprocket wheel B is cut or formed a slot b' adapted not only to allow the sprocket
wheel to be passed on to the sleeve A beyond the projection a but also to receive
a projecting piece c on the elastic brake ring or strap C. The brake ring or strap C
takes the form of an expanding split ring of a size shape and section to adapt it
to lie round the sleeve A with its one end c' abutting against the projection a²
thereon, and the projection c on its other end fitting in the slot 6' in the web b
of the sprocket wheel B.
The internal brake drum E which is preferably fitted with a lining e of leather
or other suitable material is mounted on the end of the axle Y carrying the hub X
of the driving wheel, and it is clamped between the usual shoulder or its equivalent
on the said axle and the frame Z by means of the usual nut Y' threaded on the
end of the axle and adapted to fix the axle in the frame of the machine. To prevent the
brake drum E from turning on the axle under the strain put upon it an arm E¹
or its equivalent is formed on or fixed to the said drum and is adapted to engage
with one of the members of the frame Z as shown by Figure 1.
The action of the brake is as follows:-When the angular velocity of the sprocket
wheel on the driving wheel is as great as that of the said driving wheel the brake
ring is lying snug on the bed carrying it, but when the angular velocity of the

page_text: sprocket wheel becomes less than that of the driving wheel, as is the case, when
back pressure is exerted on the cranks-as in the act of back pedalling--the brake
ring is caused to expand whereby it grips or jambs against the fixed internal brake
drum.
It will be seen that a brake constructed according to my invention is a complete
component and can be fixed to most machines already constructed by unscrewing
the sprocket wheel from the hub of the driving wheel, and fixing the sleeves carrying
the brake and driving mechanism thereon instead, and by fixing the internal brake
drum to the frame of the machine concentric with the axle of the driving wheel.
The superiority of this construction of brake over others of a similar type lies
in the fact that in my improved construction there is a bed for the elastic brake ring
or strap, which acts to maintain it in a central position and to cause it to properly
perform its function by gripping the internal brake drum all round, whereas in
previous constructions the elastic brake ring or strap is not supported internally and
therefore has nothing to keep it in a central position whereby it can act efficiently.
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 for velocipedes consisting essentially of a bed formed of two flanged
sleeves mounted on one end of the hub of the driving wheel, of a ring of teeth
forming a sprocket wheel mounted loosely on the said bed, of an elastic ring or strap
mounted loosely on the said bed and having its one end engaging with a projection
on the bed and its other end engaging with the said sprocket wheel, and of an internal
drum fixed to the axle or frame of the machine concentric with the hub of the wheel
and fitting over the elastic ring or strap mounted on the bed on the hub, as set
forth.
2. In a velocipede, the combination with the driving wheel, of a sleeve such as C
screwed on to one end of the hub of the said wheel and having a circumferential
flange a and a transverse projection a² on its periphery, of a sleeve such as A' screwed on
to the end of the hub of the driving wheel so as to act as a lock nut to the sleeve A
and having a flange such as a¹ on its periphery, of a sprocket wheel such as B
mounted loosely on the sleeve A and having a transverse slot such as b' through its
web b, of an elastic ring or strap such as C mounted on the sleeve A with its one
end c bearing against the transverse projection a² thereon and having a projection
such as c on its other end adapted to engage with the slot on the web b of the
sprocket wheel, and of an internal brake drum such as F surrounding the sleeve A
carrying the elastic ring or strap C and fixed to the axle of the driving wheel or to
the frame of the machine so that it has no rotative movement, all combined arranged
and adapted to operate in the manner and for the purpose set forth.
3. The combination of parts hereinbefore described and illustrated by the
accompanying drawing, forming my improved brake for velocipedes.
DL
day of December
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.