Improvements in Air Tubes for Pneumatic Tyres.
Year: 1898

page_text: Date of Application, 16th Apr., 1898
Complete Specification Left, 15th Aug., 1898-Accepted, 22nd Oct., 1898
PROVISIONAL SPECIFICATION.
Improvements in Air Tubes for Pneumatic Tyres.
We, RICHARD RUSSELL GUBBINS, of 95, Pelton Road, London, S.E., Engineer,
and RICHARD COTTON, of 52, Landsdowne Road, Nottinghill, W., Gentleman, do
hereby declare the nature of this invention to be as follows:-
Our improvements relate to the manufacture of air tubes for pneumatic tyres
whereby they are made tougher lighter and stronger for a smaller cost than those
at present in use. We carry out our invention as follows. We take a length of
tubular stockinette fabric equal to the length of the proposed air tubes. This we
coat on one side with india rubber either all over or along the lines on which it will
be afterwards cut into strips of the right width for air tubes. The other side is
coated in stripes along the cutting lines only. When dry it is cut in strips and
wound round mandrils either spirally or otherwise. It is then coated with thick
dissolved rubber and vulcanized by either the hot or cold process. The tube ends
may be joined inside a short length of solid rubber tube which may also carry the
inflating valve.
R. R. GUBBINS,
Agent for Applicants.
improvements in Air Tubes for Pneumatic Tyres.
We, RICHARD RUSSELL GUBBINS, of 95, Pelton Road, London, S.E., Engineer,
and RICHARD COTTON, of 52, Landsdowne Road, Nottinghill, London, W., Gentle
man, 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;-
:-
Our improvements relate to the manufacture of air tubes for pneumatic tyres
whereby they are made tougher, lighter and stronger, for a smaller cost than those
at present in use.
I
We carry out our invention as follows. We take a length of tubular stockinette
fabric equal to the length of the proposed air tubes. This we coat on one side with
india rubber either all over or along the lines on which it will be afterwards cut
into strips of the right width for air tubes. The other side is coated in stripes
along the cutting lines only. When dry it is cut in strips and wound round
mandrils either spirally or otherwise. "It is then coated with thick dissolved
rubber, and vulcanized either by the hot or cold process. The tube ends
joined inside a short length of solid rubber tube, which may also carry the inflating
valve.
may
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page_text: We attain our objects by the means illustrated in the accompanying drawings,
in which Fig. 1 is a section of a cylinder for stretching and spreading the
stockinette tubular fabric. Fig. 2 is a side elevation of same. Fig. 3 a
stockinette and india rubber spirally wound air tube on a mandril. Fig. 4 a table
with two strips of stockinette laid on it ready for winding on mandrils. Fig. 9
shows one of the strips in Fig. 4 after it has been wound on a mandril with a
straight seam. Fig. 5 shows a section of Fig. 9 on an enlarged scale. Fig. 6
shows the same being turned inside out. Fig. 7 shows an air tube of rubber lined
with stockinette and method of fixing valve employed though any well known
method of fixing valves may be employed. Fig. 8 shows a joint in the same
tube, similar reference letters refer to similar parts through the several views.
D. Figures 1 and 2 show a drum on which the tubularly woven stockinette fabric
is first drawn in order that it may be spread with india rubber upon one side.
When the india rubber is quite dry the fabric may be cut lengthwise into strips ss,
each of which is sufficient for one air tube. Fig. 3 shows an air tube made from
one of these strips and spirally wound on a mandril. A liberal coat of india rubber
must be applied all over the outside ss and after being vulcanized the tube
is finished when it has been removed from the mandril,
Fig. 4 shows the strips ss laid on a level smooth zinc covered table T, with the
india rubber side B on top. Along the edges of ss we solution thin and narrow
strips ss of pure rubber, and commencing with this edge first we roll the strip
lengthwise on a smooth mandril as shewn in Fig. 9. As soon as this is vulcanized
we turn it inside out as shown in Fig. 6.
We also make light tubes of india rubber in the ordinary way known to india
rubber makers, one of these is shown in Fig. 7. Having turned this first inside
out, we clean it well and give it a coat of india rubber solution. On this we wind
or fold a strip of rubber coated stockinette s as shewn in Fig. 9 and finally turn
the tube inside out again sending the stockinette to the inside A and bringing the
rubber to the outside B as shown in Figs. 7 and 8.
We joint our tubes in the manner shown in Fig. 8. The stockinette is removed
for about an inch in one end of the tube to be joined and the india rubber is
removed from the outside of the other end the same length. The surfaces being
solutioned and put together in the usual way a joint is made both in the rubber
and in the stockinette.
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) An air chamber for a pneumatic tyre made of stockinette coated with india
rubber substantially in the manner described.
(2) An air chamber for a pneumatic tyre made of india rubber lined with
stockinette as and for the purpose set forth.
Dated this 15th day of August 1898.