An Improvement in Pneumatic Tyres.
Year: 1893

page_text: being date of first Foreign Application (in (17th June, 1893
France)
Date of Application (in United Kingdom), 22nd Dec., 1893
Complete Specification Left, 27th Aug., 1894-Accepted, 29th Sept., 1894
Date of Application (in United Kingdom), 22nd Dec., 1893
Complete Specification Left, 27th Aug., 1894-Accepted, 29th Sept., 1894
PROVISIONAL SPECIFICATION.
An Improvement in Pneumatic Tyres.
I, PAUL CHARLES ERNEST GARNAUD of 33, Rue de Château, Neuilly, Seine,
France, Velocipede Manufacturer, do hereby declare the nature of this invention
to be as follows:-
The pneumatic tyres of velocipede wheels often burst, either during inflation or
in consequence of a sudden rise of temperature when travelling, this being due to
the fact that one never knows to what degree the pressure in the air chamber has
been brought.
To obviate this I apply to pneumatic tyres a small safety valve which allows of
the escape of air in excess and thus prevents any accident occurring.
This novel application which forms the object of the present invention will be
readily understood from the following description reference being had to the
accompanying drawing, Figure 1 of which represents a sectional view and Figure 2
an external view of the improvement applied.
As will be seen by the drawing, the rim a, the cover b, and the inner concentric
air chamber c, are all perforated, on the side next the hub of the wheel, to give
passage to the screwed nipple or stem d of a valve chamber e. This nipple or stem
is secured within the air chamber by means of a nut f which is secured by a strip
of rubber fabric 9 cemented at its edges to said chamber.
Within the valve chamber e is the valve formed of a ball or cone of india-
rubber or metal mounted upon a stem which extends through a guide j
and through the screw-cap k of the valve-box. 7 is a coiled spring surrounding
the stem and bearing at one end against a collar m and at the other against
the screw-cap k and serving to hold the ball against its scat n.
When the pressure is too great, the spring is compressed, the ball h raised
from its seat, and the air in excess supplied by the pump escapes through orifices o
made in cap k. Although I prefer that the cap k for closing the valve-box should
be screwed on as indicated in the drawing, it may be fixed thereto in any suitable
manner.
It will be understood that the spring / is made of a strength proportionate to the
resistance of the air chamber.
The valve box would be entirely enclosed in an india-rubber sheath which by
preventing the admission of dust ensures the efficient working of the valve.
Dated this 22nd day of December 1893.
P. C. E. GARNAUD,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.

page_text: An Improvement in Pneumatic Tyres.
I, PAUL CHARLES ERNEST GARNAUD of 33 Rue du Château Neuilly, Seine,
France, Velocipede 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 :-
The pneumatic tyres of velocipede wheels often burst, either during inflation or
in consequence of a sudden rise of temperature when travelling, this being due to
the fact that one never knows to what degree the pressure in the air chamber has
been brought.
To obviate this apply to pneumatic tyres a small safety valve which allows of
the escape of air in excess and thus prevents any accident occurring.
This novel application which forms the object of the present invention will be
readily understood from the following description reference being had to the
drawing accompanying my Provisional Specification Figure 1 of which represents
a sectional view, and Figure 2 an external view of the improvement applied.
As will be seen by the drawing, the rim a, the cover b, and the inner concentric
air chamber c are all perforated on the side next the hub of the wheel, to give
passage to the screwed nipple or stem d of a valve chamber e. This nipple or stem
is secured within the air chamber by means of a nut which is retained by a strip
of rubber fabric g cemented at its edges to said chamber.
Within the valve chamber e is a valve h formed of a ball or cone of indiarubber
or metal mounted upon a stem i which extends through a guide ; and through the
screw cap k of the valve box. I is a coiled spring surrounding the stem i and
bearing at one end against a collar m and at the other against the screw-cap k and
serving to hold the ball against its seat n.
When the pressure is too great the ball h is raised from its seat, the spring is
compressed and the air in excess supplied by the pump escapes through orifices o
made in cap k. Although I prefer that the cap k for closing the valve-box should
be screwed on as indicated in the drawing, it may be fixed thereto in any other
.suitable manner.
It will be understood that the spring is made of a strength proportionate to the
resistance of the air chamber.
In order to ensure the efficient working of the valve, the valve box would
be entirely enclosed in an india-rubber sheath so as to prevent the admission
.of dust.
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 herein described safety valve for pneumatic tyres constructed substantially
as described and applied to the tyre as specified.
Dated this 27th dex of August 1801
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.