Improvements in Covers for Pneumatic Tyres for Cycles and the like.
Year: 1897

page_text: Date of Application, 23rd July, 1897-Accepted, 28th Aug., 1897
COMPLETE SPECIFICATION.
Improvements in Covers for Pneumatic Tyres for Cycles and the like.
We, ALBRECHT HANSEN of Lille Torvegade 12, Copenhagen, in the Kingdom
of Denmark, Manufacturer of Pneumatic Tyres, and THEODOR LINDGREEN of
Tulipangade 7, Copenhagen, in the Kingdom of Denmark, Manufacturer of
Pneumatic Tyres; 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 present Invention has for object to prevent the puncturing of pneumatic
tyres for cycles and other vehicles by sharp stones, fragments of glass, or the like.
This object is attained by embedding in the cover of the tyre fine, closely-woven,
annealed, brass wire gauze.
The different steps in the operation of making the cover are illustrated in the
accompanying drawing and will be described with reference thereto.
A strip of linen A cut on the bias, or it may be on the straight, of the shape
shewn in Figure 1 coated with cement and a similar, but somewhat smaller, strip B
of the above described metal gauze are placed one upon the other and cemented
together. Along the middle of the strip of metal gauze B on the still uncovered
side a narrower strip of linen C cut on the bias and also previously coated with cement
is cemented as shewn in Figure 2. The obliquely-cut ends of these three superposed
layers are then fastened together so that an annulus is formed which is put upon a
ring mould E having a cross-section of semi-circular forin with lateral shoulders as
shewn in Figures 3 and 4, in which figures are also seen cross-sections of the annulus
formed by the three layers before and after moulding. The sides of the annulus are
now bent down over the semi-circular mould F shewn in cross-section, coppered wire
edgings D, Figure 4, are pushed in over them, and the edges of the strips A and B
are then folded upwards and cemented together exactly on the middle of the mould F
as shewn in Figure 4. The width of the strip C is such that it reaches exactly
round the circumference of the mould F from wire-edging to wire-edging, whereas
the widths of the strips A and B are such that the edges, after being bent up over
the edgings, overlap each other at the middle of the mould F. Lastly, an india-
rubber covering is cemented on as usual and after being sufficiently dried the cover is
removed from the mould.
By placing the metal gauze as described above it is on both sides covered by linen
so that it cannot injure the air tube of the pneumatic tyre by friction. Through
being annealed it has become so elastic that the tyre runs extremely smoothly at the
same time that it is capable of almost absolute resistance against heing punctured,
this resistance being increased by the linen strips being coated with cement.
possibility of the bursting of the tube is also excluded.
The
For heavier vehicles, several layers of metal gauze and cement-coated linen strips
may be used in the above manner.

page_text: Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed we declare that what we
claim is :-
1. A cover for pneumatic tyres for cycles and other vehicles, characterized by the
cover being inlaid with fine, very closely-woven, annealed, metal gauze so as to make
puncturing impossible.
2. The manner of manufacturing the pneumatic tyre cover specified in Claim 1,
consisting in applying on both sides of the metal gauze, linen strips coated with
cement the one strip being somewhat wider than, and the other one only half so
wide as, the gauze and the different strips being so applied and moulded that the
gauze in the finished cover is double and that the two layers of metal gauze are
separated by, and covered on the outside by, linen so as to obtain a reliable union of
the different layers as described.
Date: 1 J... STI 1007
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.