Improvements in Wheel Tyres.
Year: 1897

page_text: Date of Application, 3rd May, 1897-Accepted, 12th June, 1397.
Improvements in Wheel Tyres.
1, RICHARD KENDALL EVANS, of 40, Edith Road, West Kensington, in the
County of London, 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 wheel tyres for cycles and other vehicles and has for its
object to provide a pneumatic or other efficient elastic tyre which shall not in use
be liable to injury and which has an additional and working tread or surface which
can be easily renewed when worn or injured without affecting the rest of the tyre
or parts in connection therewith. For this purpose according to my invention
I construct a compound tyre comprising a rim of any ordinary or suitable kind,
metallic or otherwise, fixed to the spokes and fitted with a pneumatic cushion or
other efficient elastic tyre, combined with an outer rim, preferably metallic,
encircling such tyre circumferentially and having projections upon its convex side,
continuous or interrupted, adapted to receive between them and upon the said rim
an outer and additional working tread or. tyre; such outer and additional tyre may
be pneumatic and attached between the said outer rim-projections by inflation or
in any usual way, but I prefer to use the cushion or solid type of tyre sprung on or
cemented thereto. In my improved compound tyre therefore I may have a double
pneumatic or any combination of pneumatic and solid tyres or of solid tyres only,
but in any such combination I employ the said outer interposed circumferential
rim or hoop with projections to receive and hold the outer working tyre; such
outer rim is rolled or made to the desired form and when used upon cushion or
solid tyres it may have sufficient spring or resiliency to enable it to be sprung into
position or it may be made with one side open to admit the inner tyre and be
afterwards closed up upon same or it may be cut through transversely in one or
more places and after being placed in position upon the tyre be drawn together
tightly around same and then permanently secured by soldering screwing or
rivetting or it may be rolled in two longitudinal parts adapted to be fixed together
centrally after they have been placed upon the inner tyre. I do not however
confine myself to any special method of securing the outer rim in position upon the
inner tyre since many suitable ways could be devised.
In order that my invention may be more fully understood I have shown in
the accompanying drawings sections of wheel tyres constructed in accordance
therewith.
n
Fig. 1 is a cross-section through a pneumatic tyre compounded as described with
a solid elastic tyre.
Fig. 2 is a similar section through a cushion tyre compounded with a solid
elastic tyre and
Fig. 3 is a like section through a tyre composed of two solid elastic tyres of
different diameters.
Like reference letters indicate the same or like parts in the several figures.
Referring to Fig. 1, P is a pneumatic tyre which in the example shown is a plain
rubber air tube adapted to be inflated in the usual way, but it may of course be
covered if desired with suitable protective material. It is attached in any known
manner to an ordinary wheel rim such as R carried by the spokes, by inflation or
otherwise. D is the outer rim or hoop encircling and embracing in suitable degree
be pneumatic tube or tyre P, and is secured thereto by inflation of the said tyre P
гр
1

page_text: or otherwise suitably; d, d are the two curved projections on the outer or convex
surface of the said rim D and they are spaced apart at such distance as to admit
and receive between them and bedding upon the rim D an outer working tyre or
tread T of any required diameter, which is secured in position by cementing or
otherwise. Care must be taken that the facing edges of the two rims R and D do
not approach too nearly together so as to cause liability to nipping of the tyre P
in any circumstances.
Fig. 2 shows a similar arrangement of a cushion tyre C combined with rim D
and working tyre T which will be readily understood since the above description of
construction applies.
In Fig. 3 a solid elastic tyre E is interposed between the two rims R and D.
The inner rim D is constructed and adapted to be fixed upon the tyre E in any of
the ways above referred to or in any convenient and workmanlike manner.
As will be seen by any of these arrangements the inner tyre is isolated from the
road and rendered secure from all liability to cutting or puncturing while possessing
all the properties of a pneumatic, enshion or elastic solid tyre as the case may be,
and a great advantage incident to the employment of a narrow solid elastic tyre as
a working tread is that the objectionable sucking action of pneumatic tyres due to
the large surface they expose to contact with the ground, more especially when not
fully inflated is obviated; it will be obvious that when worn or injured the working
tyre T can be removed repaired or renewed without affecting the inner tyre or
either of the rims.
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 tyre for wheels consisting in the combination with a rim and a pneumatic
or elastic tyre carried thereby of an outer rim encircling such tyre circumferentially
and having projections upon its outer or convex side between which is fixed an
additional and working tyre substantially as and for the purpose herein described.
2. Compound tyres for wheels of cycles and other vehicles constructed
substantially as and for the purposes herein set forth.
3rd day
For the Applicant,
J. C. CHAPMAN,
70 Chancery Lane, London, W.C., Chartered Patent Agent.