Improvements in Pneumatic Tyres.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres.
I, FRIEDRICH GARVENS of 15 Prinzen Strasse Hannover, in the Empire of
Germany, Engineer, do hereby declare the nature of this invention to be as
follows:-
The invention explained by means of the annexed drawing consists of a method
of fitting an air-tube closed at both ends quickly easily and securely with a tyre
cover, on to the rim of a bicycle.
For this purpose the air tube has a length equal to the circumference of the
rim and also has a valve for inflating it. The tube S is easily pushed inside itself by
means of a rod T (Figure 1 represented in longitudinal section) the ends are
pushed in so far that they come up close to the valve V and the double tube S in
Figure 2 is formed, which is now fixed to the rim along with the tyre cover in
the ordinary way. This is done easily and conveniently as shown in Figure 2,
as the tube has only to be adjusted to one half of the rim.
The pump is now applied to V and air is pumped into the tube $ which is
filled and by continued pumping the ends are more and more pressed out until
at length they meet each other and the effect of a continuous tube is produced as
hown in Figure 3.
This new method obviates all difficulties and mishaps of which only that
commonly known one illustrated in Figures 4 and 5 viz., the pinching of the air
tube when adjusting of the tyre cover is mentioned. It is clear that the double-
ended air tube is easily removable without taking off the wheel and by the method
explained can be easily replaced after a slight or extensive repair.
It will thus be seen that the invention consists in the employment of a tube
with two closed ends and a method of fitting it to the rim of a bicycle by turning
it inside itself and forcing the ends in towards the middle part where the valve is by
applying the tube with the tyre cover to the rim and then by air pressure bringing
the two ends out until they meet together.
Dated this 22nd day of October 1896.
FRIEDRICH GARVENS,
By Henry Skerrett,
Agent for Applicant.

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This invention relates to pneumatic tyres for the wheels of cycles and other
vehicles, and, as explained by means of the annexed drawings consists of a method
of fitting an air tube closed at both ends quickly, conveniently and securely
together with the tyre cover, on the rim of a bicycle or other wheel. The air tube S
has for this purpose the length equal to the circumference of the rim u and is
provided with a valve e, for inflating it with air.
To prepare the close-ended air tube for application to the wheel rim, it must be
turned inside itself or the outer end parts are telescoped into the middle part, by
the help of a stick or rod t (as shewn in Figure 1 in section) or other convenient
means, to such an extent that each of its closed ends comes up to, or approximate
to, the valve in the hollow space s, and the double tube. Figure 1, is constructed,
which, together with the tyre-cover L, is put on the rim in the usual way.
This is easily effected since, as Figure 2 shews the tube has only to be applied
to half the rim. By means of the pump applied at V air is introduced into the
tube which becomes inflated, and by continued jumping, the ends s are pushed
forward more and more until the air tube is extended to its full normal length
when the said ends take up a position against each other, when the air
chamber then resembles an endless tube.
This method of applying the tyre does away with all difficulties and incon-
veniences attendant upon the old methods of adjusting the tyre cover of which only
one is referred to, of which riz, the pinching of the inner tube as explained by
Figures 4 and 5. It is manifest that it is possible to take off the air tube without
detaching the wheel quite easily by this method and also to replace it after effecting
a large or small repair in either.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
First In pneumatic tyres having air tubes closed at both ends, the method of
preparing the said air tube for application to a wheel rim by turning or telescoping
the said ends inside the middle part, thereby reducing its normal length,
substantially as and for the purpose described and set forth.
Secondly:-In pneumatic tyres having inner tubes with both ends closed, the
method of applying the prepared air tube, together with the tyre cover to the
wheel rim, and of extending the same to its full normal length by inflation,
substantially as described and set forth.
Dated this 20th day of May 1897
FRIEDRICH GARVENS.
By Henry Skerrett,
24 Temple Row, Birmingham, Agent for Applicant.