Improved Tyre for Wheels,
Year: 1897

page_text: Date of Application, 11th Mar., 1897-Accepted, 15th May, 1897
Improved Tyre for Wheels,
We, RICHARD LINS of 13, Seydelstrasse, Merchant, and ADOLF GUNTHER of
23 Hochmeisterstrasse, Chaser, both of Berlin in the German Empire, 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:-
The new wheel tyre which is devised especially for use with oyoles, forms a substitute
for the usual so called pneumatic tyres filled with compressed air and obtains its
elasticity also by means of compressed air which however is not prepared by com-
pression in the usual manner but by means of the load carried by the vehicle, and
moreover is produced in varying strength corresponding to the load.
In the accompanying drawing
Figure 1 shows a portion of such a wheel tyre in section.
Figures 2, 3, and 5 show the single component parts.
Figure 4 shows another construction.
The tyre is composed of two indiarubber tyres A. B. A is the outer tread which
is inserted in a cavity C of the tyre B; the latter forms the means of the elasticity.
The said tyre B has inside an annular cavity b, the walls of which form convex
surfaces projecting inwards and the form of which is determined by that of the
outer parts of the tyre in connection therewith. The profile of the tyre B is composed
of the upper cheek pieces dd the side parts ff and the lower arched portion g with
the projections g'g'; the space b is filled with air at the usual atmospheric pressure ;
the tyre B is secured upon the wheel rim D which is formed of a concave steel felloe
provided at the edges with channels A in such a manner that the parts of the tyre ff
can be pressed together and the lower ring 9 inserted in the felloe D, whereupon,
after the removal of the side pressure the parts g' gl spring into the corresponding
cavities h.
As the distance of the parts g'g' from each other is in any case somewhat greater
than that between the parts hh, the said parts g¹ are rendered air tight by reason of
the natural elasticity of the indiarubber on their insertion in the cavities h, so that as
will be further explained hereafter, when a pressure is exercised upon the periphery
of the wheel the air contained in the space F will be compressed, and at the same time
the parts g'g' will be pressed against the parts hh, so that the space Facts as a
compression chamber and the air therein itself closes the exit through the
sides gh.
The tyre A the inner diameter of which is smaller in the unexpanded condition than
the corresponding diameter of the cavity in the tyre B, is also inserted in the cavity C
simply by stretching, and holds there by means of its elasticity alone, that is to say
by pressure exercised upon the cavity C. As stated above, when the vehicle or cycle
receives its load the arch 9 is pressed downwards and the volume of air in F is reduced
and correspondingly compressed; the proportions of the arrangement shown in section
are so calculated that as soon as the arch of the piece g is pressed down somewhat
over the horizontal line, as indicated by the dotted line in Figures 1 and 3, the lower
edges mm of the side parts d come in contact with the outside of the annular
projections whereby a further pair of side compressed air chambers also fully shut
off are formed, which increase the elasticity but which nevertheless only act with
heavy load, namely as already said when the compression of F has already occurred in

page_text: consequence of a given pressure. The tread A when the vehicle is not loaded lies
only so deep in the circular notch of B as this Figure 5 shows, so that it when heavily
laden is only pressed down at the most to the extent of one half in the cavity and
consequently cannot widen out when in use.
Figure 4 shows a section, in which the chamber 6 is connected with the chamber F
by means of openings I in the arch 9, which openings alternate with connecting pieces
of about 25 millimetres width. This arrangement is adapted for specially heavy loads
as hereby a greater air space is formed. When loaded the openings I close and two
separate air chambers are formed.
Wheel tyres formed in the manner above described possess the advantage of
pneumatic tyres without their disadvantages and cannot be rendered unserviceable by
outer damage, are very easily placed upon the wheel rim and are retained in place
upon the same without further fastening. Owing to the continuous alteration of the
shape of the tyre during the running of the wheel any fixing of dirt upon the concave
portions of its surface is prevented.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. Elastic wheel tyres which may be hollow or solid characterised by having their
lower part formed in the shape of an arch when viewed in section and having side
projections g¹ inserted in corresponding side cavities h of the hollow stcol felloe D, so
as to leave an air space between the felloe and the tyro, which is rendered air tight by
means of the said projections g' inserted in the annular cavities h of the felloe I).
2. Elastic wheel tyres of the kind set forth in Claim 1 in which the side parts
appear in section as projecting cheeks d which form between themselves and the lower
projections g' an annular cavity, so that when the wheel is loaded the parts m are
pressed upon the projections o' and an air tight closed space formed thereby.
3. In wheel tyres of the kind set forth in Claims 1 and 2 the arrangement of a
special tread A retained by its elasticity alone in a peripheral cavity of the said
tyre.
4. In wheel tyres of the kind set forth in Claims 1 and 2 having a hollow inside b
the connection of the air space b with the air space F by means of openings 1.
Dated this 11th day of March 1897.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicants.