Year: 1897

page_text: We, ARTHUR CHARLES MOORE, Manager of Frederick Braby & Co. Limited,
Deptford, London, S.E., and GEORGE RODWELL, of 58, Stanhope Street, Euston
Road, Fitter, do hereby declare the nature of this invention to be as follows:-
Our invention relates to improved elastic tyres and rims for wheels, possess-
ing in an eminent degree the qualities of lightness, elasticity, and strength.
The wheel rim and tyre are substantially similar in form to that described
in the Specification of a previous Patent granted to one of us dated the 6th day
of February 1896 No. 2693, but instead of metallic springs the required elasticity
is obtained by pneumatic inflation, the enclosing metallic portion of the tyre
effectually preventing the puncturing of the air chamber or chambers. As in
the previous case the rim is a jointless ring preferably made of aluminium spun
up to a substantially U section, the sides or Hanges being parallel and outwardly
directed, but the tyre or outer member of the rim is differently constructed to
that before described.
According to this invention it is composed of two annular members each being
a jointless ring also preferably of aluminium spun of such form that the two when
united together form an outer annular member of approximately U section, the
sides or flanges being inwardly directed and adapted to embrace or to fit between
the sides or flanges of the rim proper with freedom for relative motion of the
tyre in the radial direction of the wheel, a sufficiently tight joint to exclude wet
and dust being formed by packings received in grooves in the outer pair of side
flanges. Each of the two members composing the outer annulus or tyre com-
prises a side or flange and a portion of the periphery, the peripheral portions
overlapping and being united (the cross bolts previously described being dis-
pensed with) by screw studs or equivalent means after being applied in position
upon the wheel and these overlapping peripheral portions are countersunk to form
a peripheral groove to receive a tread of solid rubber which is sprung into place
and secured by cement.
The requisite elasticity is imparted by a pneumatically inflated tube or by a
number of separately inflated balls of rubber confined within the rim and metallic
tyre, the adhesion of the rubber to the walls of the rim and tyre being sufficient
to prevent the creeping or displacement of the latter in the circular direction.
Dated this 8th day of March 1807

page_text: Improvements in Elastic Tyres and Kims or wheels.
We, ARTHUR CHARLES MOORE, Manager of Frederick Braby & Co. Limited,
Deptford, London, S.E., and GEORGE RODWELL, of 58, Stanhope Street, Euston
Road, London, N.W., Fitter, 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:―
Our invention relates to an improved elastic rim for wheels, possessing in an
eminent degree the qualities of lightness, elasticity, and strength, and it consists
essentially in the combination, with a jointless inner rim of approximately
U section with outwardly directed flanges, of an outer rim or member construc-
ted of two annular members together forming an outer annular member of
approximately U section with inwardly directed flanges adapted to embrace the
sides or flanges of the inner rim, and of an intervening pneumatically inflated
rubber chamber or chambers whereby the required resiliency is obtained without
liability of puncturing, the air chamber or chambers being wholly enclosed and
protected by the outer member of the metallic rim.
The invention is illustrated in the accompanying drawing forming part of this
Specification wherein we have represented in Figure 1 a cross-section of the
improved elastic rim and in Figure 2 a side view partly in section shewing the
use of a number of separate air chambers.
The wheel rim is composed of an inner annular member AB preferably of
aluminium, the part A to which the spokes are attached in the usual way being
preferably jointless and spun up to an approximately U section its sides a a
being parallel and outwardly directed from the axis of the wheel. The space
between these sides is bridged over by an intermediate annular member B also
of aluminium, of curved cross-section adapted to brace the flanges a together
and form by its externally concave surface a seat for the pneumatic chamber or
chambers. This intermediate annular member B may either form an integral
part of the inner member A or he made separately and have its edges spun over or
otherwise so formed as to embrace the edges of the flanges a, as shewn, this member
being either made jointless or having its ends joined up by ivetting to a joint
eavering piece at back and being in either case an integral part of the inner rim A
for the purposes of this invention.
The outer annular member is also preferably of aluminium spun up to an
approximately U section the side flanges being inwardly directed and formed
with hollow beaded edges e adapted to receive packings of rubber tubing held
in place by cement, between which fit the side flanges a of the inner member A
so as to make a sufficiently tight joint to exclude wet and dust whilst permitting
relative motion of the outer member C on the inner member A in the radial
direction of the wheel. This outer member C is however made of two jointless
annular members each comprising one side flange and a transverse or peripheral
portion, the peripheral portions ce overlapping each other and being united by
screw bolts and nuts e after being applied in position around the inner member A
and pneumatic chamber D. The outer member is spun of such a beaded form
in cross-section at as to form with the transverse peripheral portions e¹ a dove-
tail grooved seat to receive a solid or cushion rubber tyre tread F of suitable
section sprung into place and secured either by cement or preferably by a bind-
ing wire passed through the hollow of the rubber cushion and secured by its
ends being led through holes into the interior of the member C and secured by
any suitable means.

page_text: The pneumatic chamber (or chambers) D is confined within the hollow of the
outer member C and between it and its seat in the grooved part 1 of the inner
member A. It may be an endless tube of rubber provided with the usual
connection and valve and would preferably be enveloped in canvas or have canvas
embedded in it to limit its dilatation under internal air pressure, or it may con-
sist of a sufficient number of inflated india-rubber balls D₁ (such as are sold for
toys) packed tightly between the inner and outer members of the rim and either
in close juxtaposition as shewn, or spaced at intervals apart and there maintained
either by cup-like depressions in the seat B or by other suitable means so as
whilst pneumatically separate, to form a practically continuous, or nearly con-
tinuous, air cushion between the outer member C and the inner member A B of
the rim.
Any, or all, of the members A B and C instead of being formed as above
described may be brought to the desired shape by rolling and may be composed
of one or more lengths or sections, the joints being secured in any suitable manner.
It will be obvious that if the member C he made in two or more sections cach
such section may be complete in itself instead of being composed of two over-
lapping halves as shewn in the drawings.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. An elastic rim for wheels constructed of an inner and an outer annular
member adapted to fit the one in the other so as to permit of relative motion in
the radial direction of the wheel, and of a pneumatically inflated chamber or
chambers interposed between the inner and outer annular members substantially
as and for the purpose specified.
2. An elastic rim for wheels constructed of an inner annular member having
parallel sides, an outer annular member of approximately U section embracing
and fitting the sides of the inner member so as to permit of relative motion in
the radial direction, and of a pneumatically inflated chamber or chambers inter-
posed between the inner and outer annular members substantially as and for the
purpose specified.
3. An elastic rim for wheels constructed of an inner annular member having
parallel sides, an outer annular member of approximately U section whose sides
or flanges are provided with rubber packings adapted to embrace and fit against
the sides of the inner member so as to make a dust and wet tight joint therewith
whilst permitting of relative motion in the radial direction, and of a pneumatically
inflated chamber or chambers interposed between the inner and outer annular
members substantially as and for the purpose specified.
4. An elastic rim for wheels constructed of an inner annular member made
jointless and of approximately U section with parallel outwardly directed side
flanges, a concavely grooved annular member embracing the edges of the said
flanges so as to brace them and form a practically integral part of the inner
member, an outer annular member of approximately U section having inwardly
directed flanges adapted to embrace the inner member with freedom for relative
radial motion, the outer member being made of two jointless annular semi-
members united as described and a pneumatically inflated chamber or chambers
interposed between the inner and outer annular members substantially as
described.
5. An elastic rim for wheels constructed of an inner annular member made
jointless and of approximately U section with parallel outwardly directed side
flanges, a concavely grooved annular member embracing the edges of the said
flanges so as to brace them and form a practically integral part of the inner
member, an outer annular member of approximately U section having inwardly
directed flanges adapted to embrace the inner member with freedom for relative
radial motion, the outer member being made of two jointless annular semi-

page_text: BOOTS WIRD Avawed & improvements in Elastic Tyres and Kims for Wheels.
members united as described, and so shaped as to form a peripheral grooved seat
for a rubber tread, a solid or cushion rubber tread fitted in such groove, and a
pneumatically inflated chamber or chambers interposed between the inner and
outer annular members substantially as described.
Dated this 7th day of December 1897.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.