Improved Means of Securing Pneumatic Tyres.
Year: 1894

page_text: Date of Application, 20th Oct., 1894
Complete Specification Left. 22nd July, 1895-Accepted, 24th Aug., 1895'
Improved Means of Securing Pneumatic Tyres.
1, FREDERICK HENRY SPRANG, of Heatherbrae, Clarence Road, Wallington,
Surrey, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
:-
My invention relates to the means of securing a pneumatic tyre to the
wheel rim.
Such covers are ordinarily secured by wires passed through sheaths in the edges
of the cover and the threaded ends of the wires being bent at right angles passed
through holes in the rim and secured by nuts.
These wires are apt to break at the bend under the strain which comes upon
them and the object of my invention is to relieve them of a great portion of this
strain. For this purpose I provide, in addition to each wire, as above described,
a second wire which bridges over the gap between the ends of the first mentioned
wire and extends substantially the full circumference of the rim, its ends being
free and at a diametrically opposite point of the cover to that at which the ends
of the first wire are situate. These second wires lie in the same sheaths with the
other wires so that when the tyre is inflated the strain is distributed between the
two wires.
1001
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
Improved Means of Securing Pneumatic Tyres.
I, FREDERICK HENRY SPRANG, of Heatherbrae, Clarence Road, Wallington,
Surrey, Manufacturer, 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 securing a pneumatic tyre to the wheel rim by means of
When the wires are made
wires passed through sheaths in the edges of the cover.
fast to the rim by their ends being passed through holes in the rim and secured to
the back of the rim by nuts or otherwise, the wires are apt to break at the bend
where exposed and subject to strain in passing through the rim, and the object of
my invention is to relieve the wires of a great portion of this strain. For this
purpose I provide in addition to each of the wires above referred to, a second wire
which extends substantially the full circumference of the rim, its ends being at a
diametrically opposite point of the tyre to that at which the ends of the first wire
are situate made fast to the rim. These second wires lie in the same sheaths with
the first mentioned wires, and their ends being unfastened are dependent on
friction for the reinforcement which they afford, of the main wires, the strain due
to the inflation of the tyre being distributed between the two sets of wires. These
supplementary wires reinforce the portion of the main wires which are most liable
to yield and bridge over the gap, if any, between their ends.

page_text: In the accompanying drawing, Figure 1 represents a cross-section, taken between
the ends of the fastened wires, and Figure 2 an elevation, with portions broken
away, of the tyre and rim.
a is the cover or jacket of the pneumatic tyre having wires bb enclosed in
sheaths formed along the edges of the cover in the usual manner, the ends of these
wires being bent at right angles, passed through holes in the wheel rim c, and
secured by nuts d screwing on them. e are the supplementary wires, each lying
loose in the same sheath as the wire b which it is to reinforce, the wires e being of
such length as to embrace nearly the whole circumference of the wheel so as to
resist by their friction in the sheaths the tensional strain which comes upon them
when the tyre is inflated, the ends el being about diametrically opposite the points
of attachment of the wires b to the rim so that the supplementary wires lie across
the points of attachment of the ends of the first mentioned wires or
"break joint"
therewith. The supplementary wires e are of equal utility whether the ends of the
wires bare separated by a gap or whether they cross or pass one another before
being made fast to the rim.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The combination, with wires sheathed in the edges of the cover of a pneumatic
tyre and fastened at their ends to the wheel rim, of supplementary or reinforcing
wires lying across the points of attachment of or breaking joint with the ends of
the first mentioned wires, substantially as specified.
Dated him ond day of Tul. 1903
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.