Improvements in Drake of Retarding
Year: 1899

page_text: Date of Application, 23rd Sept.,
1000
1899
4000
Improvements in Drake of Retarding
We, EDWARD CHARLES FREDERICK ÜTTO and EDWARD CHARLES FREDERICK
Orto, 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 brake or retarding mechanism applicable to wheeled
vehicles and machinery in general, and has for its object the production of
great braking power requiring a minimum of power for its application.
This invention comprises essentially an encircling brake chain which is caused,
when a braking or stopping effect is required, to be contracted on or preferably
expanded within a suitable drum fixed on the moving part which it is required
to retard or stop.
The brake chain 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 constructed
that their ends abut one against the other so as to relieve the transverse pins
or rivets of all strain if the chain is used for braking when in an expanded con-
dition, that is to say, when the chain is under compression.
The curvature of the engaging surface of each of the links of the chain is
of the same radius as the face of the drum with which it engages when the
brake is in operation.
Any suitable means or arrangement of levers may be employed to cause the
chain to either contract or expand to grip the drum, a convenient method is
to fix one end of the chain to a non-moving part and to move the other or free
end by connecting it to any suitable lever or device capable of having the
necessary movement imparted to it.
The brake chain may be kept in its normal position i.e., disengaged on or
within the drum by any suitable form of spring or springs in which case I prefer
to arrange the chain on or within the drum in such a manner that directly
the first link of the chain engages the drum the continued rotation thereof will
tend to cause the remaining links of the chain to come almost automatically
into engagement, thus producing a powerful braking effect requiring little power
for its application.

page_text: improvements in brake or Retarding mechanism.
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 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 brake or retarding mechanism applicable to wheeled
vehicles and machinery in general, and it consists essentially of a linked band
or chain, adapted when a braking or stopping effect is required, to be contracted
on or expanded within a drum fixed on the moving part which it is required
to retard or stop, the object being the production of great braking power
requiring a minimum power for its application.
In the accompanying drawing which is given by way of illustration only:-
Figures 1 and 2 are views, in end and side elevations respectively, showing
the application of our invention to the wheel of a road vehicle, and
Figures 3 and 4 are broken views in side elevation and plan respectively of the
linked band or chain.
Throughout the views similar parts are marked with like letters of reference.
The linked band or chain A consists of a series of links of metal or other
suitable material connected together by transverse pins or rivets as shown by
Figures 3 and 4 or so shaped that they engage one another by hooking. When
the linked band or chain so formed 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 shaped that they abut one against the other as
shown so as to relieve the pins or rivels connecting them of all strain. Each
link of the band 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 resist-
ance is required it may be obtained either by lining the drum with leather or
other suitable material.
Referring to the drawing which illustrates the construction in which the
linked band or chain is adapted to be expanded within an internal drum to
produce the braking effect, the brake drum C is fixed to the wheel X in any con-
venient manner and within the drum C is mounted another drum which is
fixed to any suitable part of the frame or to the non-rotating axle Z concentric
with the drum C so as to support the chain band when it is out of action.
The one end link a of the linked band or chain A is attached to the periphery
of the drum B by means of a radially arranged projection a² engaging a hole
or slot in the periphery of the said drum, and the other end link a¹ is connected
by means of a transversely arranged stud a³ with a lever W pivotted either to
the drum B as shown, or to any convenient adjacent part of the frame of the
vehicle, the arrangement being such that the movement of the lever W in one
direction expands the linked band or chain A against the internal surface of
the drum C, and the reverse movement contracts it on to the drum B.
Any suitable form of spring such as F may be employed to return the lever W
and keep the chain band A in contact with the periphery of the drum B when
the brake is out of operation.
The necessary movement to apply the brake may be imparted to the lever W
either directly or indirectly in any suitable manner, and where the leverage

page_text: will permit we prefer to pivot the lever W at or about the centre of the wheel
to which the braking or retarding effect is to be applied.
When the braking effect is to be caused by contracting the linked band or
chain A on to the brake drum, and supporting drum B would be exterior to
the brake drum C.
The application of this brake to machinery will be apparent from the foregoing
without any further description.
It will be seen that owing to the linked formation of the brake band or chain
its links come successively and automatically into operation i.e., into engage-
ment with the brake drum C on the operation of the lever W which brings the
first and second links into frictional contact with the revolving drum C, thus
producing a powerful braking effect requiring little power for its application.
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 comprising a linked band or chain adapted to engage either by
expansion or contraction-with a drum mounted on the moving part to which
the braking effect is to be applied, the one end link of the said band or chain
being fixed to a non-rotating part, and the other end link to an operating lever,
as set forth.
(2) In a brake the combination with a brake drum, of a second drum mounted
concentrically with the brake drum and adapted to support the brake band or
chain when it is out of action with the brake drum, and of a linked strap or
chain formed of a series of metallic or other links pivotted or otherwise con-
nected together and having their operative faces curved to the same radius as
the operative face of the drum with which the linked band or chain engages, as
and for the purpose set forth.
(3) In a brake the combination with a brake drum, of a second drum mounted
concentrically with the brake drum and adapted to support the brake band or
chain when it is out of action with the brake drum, and of a linked band or
chain formed of a series of metallic links pivotted together so that their ends
abut against one another each link being of the same width and having its
operative faces curved to the same radius as the operative face of the drum with
which the brake band or chain engages, as and for the purpose set forth.
(4) In a brake the combination of a band or chain formed of a series of links
pivotted together, of a drum mounted on the rotating part to which the braking
effect is to be applied and with which the linked band or chain engages, and
of a second drum mounted concentrically with the brake drum and adapted to
support the linked band or chain when it is out of action with the brake drum,
the links of the band or chain being pivotted or otherwise connected together
so that their ends abut against one another each link having its operative face
curved to the same radius as the operative face of the drum with which the band
or chain engages, as set forth.
(5) In a brake the combination of a band or chain formed of a series of links
pivotted together, of a drum mounted on the rotating part to which the braking
effect is to be applied and with which the linked band or chain engages, and
of a second drum mounted concentrically with the brake drum and adapted to
support the linked band or chain when it is out of action with the brake drum,
the links of the band or chain being pivotted or otherwise connected together
and having their operative faces curved to the same radius as the operative face
of the drum with which the band or chain engages the one end link of the said
band or chain being attached to the supporting drum and the other end link
to a lever or its equivalent adapted to be operated to cause the band or chain
to engage the brake drum with its links in extension, as set forth.
(6) In a brake the combination of a band or chain formed of a series of links
pivotted together. of a drum mounted on the rotating part to which the braking

page_text: effect is to be applied and with which the band or chain engages, and of a second
drum mounted concentrically with the brake drum and adapted to support the
linked band or chain when it is out of action with the brake drum, the links of
the band or chain being pivotted or otherwise connected together so that their
ends abut against one another each link having its operative face curved to the
same radius as the operative face of the drum with which the band or chain
engages the one end link of the said band or chain being attached to the support-
ing drum and the other end link to a lever or its equivalent adapted to be
operated to cause the band or chain to engage the brake drum with its links
in compression, as set forth.
1000
CHEES NOTr day
1330.
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.