Improvements in Elastic Wheel Tyres.
Year: 1895

page_text: Date of Application, 9th Sept., 1895
Complete Specification Left, 8th June, 1896-Accepted, 15th Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in Elastic Wheel Tyres.
I, ANDREW MITCHELL, of Longside, Aberdeenshire, Engineer, do hereby
declare the nature of this invention to be as follows:-
My invention relates to a construction of elastic tyres for wheels, which is of the
following description. For a cycle or other light vehicle, I employ a number
of spring plates of steel or other elastic metal each bent so as to present a flat part
which is attached to the rim of the wheel on a bedding of elastic material, and two
inclined limbs having their extremities bent so as to form blades parallel to the flat
part, on which blades is fixed a ring of caoutchouc or other elastic material entirely
enclosing the spring plates. Each of the limbs, instead of being simply inclined in
one direction may have a double bend so as to form a spring of a diamond shape,
and the extremities of the limbs may extend in opposite directions and terminate in
hooks which are linked to the adjacent spring plates. For heavier vehicles I
provide shoes to constitute the tread of the wheel, the shoes being jointed to each
other and to the spring plates by transverse pins or bolts passing through eyes of
the shoes and eyes formed by bends at the extremities of the spring plates. For a
tyre subject to severe strain, such as that of a wheel of a traction engine, I prefer
to joint the shoes also by suitable links to side plates attached to or forming part of
the rim of the wheel. These side plates are also preferably employed to steady the
spring plates, even when the shoes are not linked to them. The spaces between
the spring plates may be filled with fibrous or elastic material.
Dated this 9th day of September 1895.
ABEL & IMRAY,
Agents for the Applicant.
I, ANDREW MITCHELL, of Longside, Aberdeenshire, 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:-
My invention relates to a construction of elastic tyres for wheels as I shall describe
referring to the accompanying drawings.
Fig. 1 is a part side elevation partly in section and Fig. 2 is a transverse section
of a tyre according to my invention for a velocipede or other light vehicle.
Fig. 3 is a part side elevation partly in section and Fig. 4 is a transverse section
of a tyre for a traction engine or other heavy wheel.
Referring to Figs. 1 and 2, to a hoop A 1 rivet or otherwise fix a number of
springs B each consisting of a blade of steel or other elastic metal bent so as to
bave a flat part b attached to the hoop A, two oblique limbs 6' and two outer flat
parts parallel to b. The hoop A with the springs B fixed to it is held within a
cover C of caoutchouc or composite fabric with an externally thickened part c
Price 8d1)

page_text: forming a tread cushion attached to the rim D, the edges d of which may be pressed
inwards, as shewn in Fig. 2, so as to form grooves holding the thickened edges of
the cover C. Or the cover C may be held to the rim in any other known
manner.
As shewn in Figs. 3 and 4, the limbs 6 of the springs B terminate in eyes b
through which pass pins E jointing shoes F to the springs, these shoes constituting
the tread of the wheel. The springs B are in this case bolted to the rim D and are
steadied laterally by side cheeks G also bolted to the rim.
In both constructions of tyre the spaces between the limbs of the springs may be
stuffed with fibrous material such as cocoa fibre, which in the case of the heavy tyre,
Figs. 3 and 4, should be compressed so as to render it less yielding.
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 I
claim is -
1. An elastic wheel tyre consisting of bent blade springs of elastic metal attached
to a hoop and enclosed within a flexible cover, substantially as described with
reference to Figs. 1 and 2.
2. An elastic tyre for a heavy wheel consisting of bent blade springs of elastic
metal attached to the rim of the wheel and having tread shoes jointed to their limbs,
substantially as described with reference to Figs. 3 and 4.
Dated this 8th day of June 1896.
ABEL & IMRAY,
Agents for the Applicant.