Year: 1899

page_text: Date of Application, 28th July, 1899
Complete Specification Left. 25th Apr., 1900 -Accepted, 26th May, 1900
We, EDWARD CHARLES FREDERICK OTTO and EDWARD CHARLES FREDERICK
OTTO, Junior, both of 16, Therapia Road, Honor Oak, in the County of Surrey,
Engineers, do hereby declare the nature of this invention to be as follows:-
This invention relates to that type of brake consisting of a split metallic ring
adapted to be mechanically expanded against the circular surfaces of either inner
or outer drums used in connection with the hubs of driving wheels and adapted
to be put into operation by the action of back-pedalling, and it consists in
employing instead of the usual split metallic ring-a series of links pivotted
together in the form of a chain the object being to enable a more perfect grip
to be obtained between the ring or band and the drum than is possible with spilt
rings in one piece.
The chain I employ is made of a series of links connected together either by
transverse pins or rivets or so shaped that they may be hooked one to another.
When the links are connected by pins or rivets they are preferably so
structed that their ends abut one against the other so as to relieve the trans-
verse pins or rivets of all strain when the band is under compression.
con-
The curvature of the outer surface of each of the links of the chain is of the
same radius as the face of the internal drum with which it engages when the
brake is in operation.
As is usual in this type of brake one end of the chain is connected to the chain
wheel which is loosely mounted on the hub, and the other end is attached directly
or indirectly to the hub, while the drum against the interior surface of which
the chain expands and engages, is fixed concentric with the hub and chain wheel
to any convenient part of the frame.
I prefer to so adjust the attachment of the ends of the chain to the chain
wheel and hub respectively that the said ends engage when the chain wheel is
driven, thus relieving the links of the chain from all strain so long as the
machine is being propelled in a forward direction.
5
We, EDWARD CHARLES FREDERICK OTTO and EDWARD CHARLES FREDERICK
Orro, Junior, both of 16, Therapia Road, Honor Oak, in the County of Surrey,
[Price 8d.]

page_text: Engineers, 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 consisting of a split metallic ring
adapted to be mechanically expanded against the circular surfaces of either inner
or outer drums used in connection with the hubs of driving wheels and adapted
to be put into operation by the action of back-pedalling, and it consists in
employing instead of the usual split metallic ring-a series of links pivotted
together in the form of a chain the object being to enable a more perfect grip
to be obtained between the ring or band and the drum than is possible with split
rings in one piece.
con-
The chain employed is made of a series of links connected together either by
transverse pins or rivets or so shaped that they may be hooked one to another.
When the links are connected by pins or rivets they are preferably so
structed that their ends abut one against the other so as to relieve the trans-
verse pins or rivets of all strain when the chain is under compression.
The curvature of the outer surface of each of the links of the chain is of the
same radius as the face of the internal drum which it engages when the brake is
in operation.
As is usual in this type of brake one end of the chain is connected to the chain
wheel which is loosely mounted on the hub, and the other end is attached directly
or indirectly to the hub, while the drum with which the chain engages, is fixed
concentric with the hub and chain wheel to any convenient part of the frame.
We prefer to so adjust the attachment of the ends of the chain to the chain
wheel and hub respectively that the said ends engage when the chain wheel is
driven, thus relieving the links of the chain from all strain so long as the
machine is being propelled in a forward direction.
:-
In the accompanying drawing which illustrates our invention:-
Figures 1 and 2 are views-partly in section-in broken front elevation and
side elevation respectively showing one form our invention may assume.
Figures 3 and 4 are similar views showing an alternative construction, and
Figures 5 and 6 are broken views in side elevation and plan respectively of the
linked strap or chain.
Throughout the views similar parts are marked with like letters of reference.
Referring to Figures 1 and 2. On a prolongation of the barrel of the hub X¹
of the driving wheel exterior to one of its flanges is mounted a flanged drum B.
This is conveniently effected by screwing it on to the said prolongation and
locking it thereon by means of a flanged lock nut B¹, the thread of the screw of
the lock nut being preferably of the opposite hand to that of the drum. On the
drum B is loosely mounted a ring of teeth forming the sprocket wheel Y. On the
axle which is fixed to the frame of the machine-is mounted a flanged disc C
forming an internal drum which is prevented from revolving by carrying a stud
or finger c adapted to engage one of the members of the frame of the cycle, but
any other suitable device may be employed.
On the periphery of the drum 13 rests the linked strap or chain A. The one
end link a of this linked strap or chain A is attached to the periphery of the
chain drum B by means of a radially arranged projection a² engaging a trans-
verse groove in the drum as shown in Figure 2, and the other end link a¹ of
the linked strap or chain is attached to the sprocket wheel Y by means of a trans-
verse projection a³ engaging a hole or slot in the web of the sprocket wheel as
shown in both the figures.
The linked strap or chain A consists of a series of links preferably connected
by transverse pins or rivets as shown by Figures 5 and 6, though they may be
so shaped that they engage one another by hooking. When the linked strap or
chain is intended to act by coming into contact with an internal drum i.e., when
it would be in a state of compression, the ends of the links are preferably so

page_text: shaped that they abut one against the other as shown so as to relieve the pins or
rivets connecting them of all strain. Each link of the strap or chain is made
of the same width and its operative engaging surface-whether it be the outer
or inner one is made of the same curvature as the surface of the drum with
which it is intended to engage so as to obtain the greatest possible. amount of
frictional surface. If increased frictional resistance is required it may be obtained
either by lining the "brake drum" with leather or other suitable material, or
by using a linked strap or chain of such a length that it makes more than one
complete turn round the drum.
When the pedals of the bicycle are driven in a forward direction the chain
wheel Y revolves in the direction of the arrow and its motion is imparted to the
hub X of the driving wheel by reason of the end link a¹ of the linked strap or
chain A engaging the other end a as shown by Figure 2. When back pressure
is exerted on the pedals the end link a' of the linked strap or chain is caused to
move in the opposite direction to the other end link a-which owing to the
impetus of the machine still rotates in the same direction as the chain wheel-
thereby expanding the linked strap or chain A which causes it to engage the
brake drum C.
As a modification the linked strap or chain may operate to apply the brake by
contraction instead of expansion, in which case the drum B would be an internal
one and the drum C an external one, and the web of the sprocket wheel Y
would be carried between the drum B and a flanged plate V. screwed on the
hub X as shown by Figures 3 and 4. In this construction the radially arranged
projection on the end link a of the linked strap or chain A engages a trans-
verse groove in the drum B, and the transverse projection a³ on the other end
link of the linked strap or chain engages a hole or slot in the web of the
sprocket wheel, so that the driving motion of the sprocket wheel is imparted
to the hub of the driving wheel through the compression of the linked strap or
chain against the drum B.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
-
(1) A brake for velocipedes comprising a linked strap or chain, a drum arranged
concentrically with the hub of the driving wheel, and a sprocket wheel mounted
loosely on the hub of the driving wheel, the said drum being adapted to receive
the engagement of the linked strap or chain when the brake is in action, one
end link of the linked strap or chain being attached directly or indirectly to the
hub of the driving wheel and the other end link to the sprocket wheel mounted
loosely on the hub of the driving wheel, as set forth.
(2) In a brake for velocipedes the combination with the hub of the driving
wheel, of a drum fixed concentrically thereon and adapted to support the operat-
ing linked strap or chain when the brake is out of action, of a sprocket wheel
mounted loosely on the said drum, of a second drum mounted on the axle of the
driving wheel concentrically with the first drum and so attached to the frame of
the machine that it cannot rotate, and of a linked strap or chain attached at
one end to the drum fixed to the hub of the driving wheel and at the other end
to the sprocket wheel, as and for the purpose set forth.
(3) In a brake for velocipedes the combination with the hub of the driving
wheel, of a drum mounted concentrically thereon and adapted to support the
operating linked strap or chain when the brake is out of action, of a sprocket
wheel mounted loosely on the said drum, of a second drum mounted on the axle
of the driving wheel concentrically with the first drum in such a manner that it
cannot rotate and adapted to receive the engagement of the linked strap or chain
when the brake is in action, and of a linked strap or chain formed
of a series of links pivotted together so that their ends abut against one
another each link having its operative face curved to the same radius as the

page_text: operative face of the drum with which the linked strap or chain engages when
the brake is in action, the one end link of the said linked strap or chain being
connected to the drum fixed to the hub of the driving wheel and the other end
link to the sprocket wheel, as and for the purpose set forth.
(4) In a brake for velocipedes the combination with the hub of the driving
wheel, of a drum mounted concentrically thereon and adapted to support the
operating linked strap or chain when the brake is out of action, of a sprocket
wheel mounted loosely on the said drum, of a second drum so mounted on the axle
of the driving wheel concentrically with the first drum that it cannot rotate and
adapted to receive the engagement of the linked strap or chain when the brake
is in action, and of a linked strap or chain formed of a series of links pivotted
together so that their ends abut against one another each link being of the same
width and having its operative face curved to the same radius as the operative
face of the drum with which the linked strap or chain engages when the brake
*s in action, the one end link of the said linked strap or chain being connected to
the drum fixed to the hub of the driving wheel and the other end link to the
sprocket wheel, as and for the purpose set forth.
Dated this 20th day of April 10.
ROBERT E. PHILLIPS, Assoc.M.Inst.C.E., M.I.Mech. E.,
Chartered Patent Agent, 70, Chancery Lane, London, W.C.,
Agent for the Applicants.