Improvements in and connected with Pneumatio Tyres.
Year: 1896

page_text: Date of Application, 27th Apr., 1896-Accepted, 26th Sept., 1896
COMPLETE SPECIFICATION.
Improvements in and connected with Pneumatio Tyres.
JOSEPH BARTON SCAMMELL of 56 Lendenhall Street in the City of
London Merchant 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 :-
In carrying out my invention I take any good make of pneumatic tyre, and provide
same with a special valve as hereinafter described.
My improvement consists mainly in using carbonic acid gas to inflate the tyre.in
place of ordinary air, and for this purpose I have designed the hereinafter described
valve, though I do not wish to bind myself to this special form.
The valve and body are constructed as follows:-The body thereof A is secured
in any ordinary manner to the wheel rim and to the air tube and cover, & is provided
internally with a fine threaded screw B' and also a valve seat E near the lower end
of the interior, a nicely finished surface is also given to the upper and outer portion
of the valve body, thus forming another seat B, the valve proper consists of a
screwed body B somewhat Tshaped in vertical cross section provided with finely
tooled surfaces to engage with the valve seats, and also with a hinged lever CD at
its outer and upper surface, so that same may be screwed home firmly without the aid
of a spanner, washers of any suitable material may be used in order to make the
valve more gas-tight.
It is preferable to make use of the carbonic acid gas when compressed into the
form of solid grains or pellicles which must be kept in suitable containers under
pressure, and may be carried in the tool satchel.
When it is desired to inflate the tyre, the valve should be unscrewed (the
non return valve F, keeping in any gas remaining in the tyre), and one or more of
the gas pellicles introduced through the body of the valve, into the tyro; the said
pellicle will then gradually assume the gaseous condition, but the change will take
place more & more slowly as the pressure in the tyre increases, until if the tyre be
strongly & suitably inade, the conversion of the pellicle into gas will slacken or
cease to take place until the tyre has lost some of its pressure by filtration
past the valves or otherwise; it will thon hasten or recommence gasyfying & Bo
a constant and automatic pressuro will be kept up; a safety valve may be applied
to the tyre if desired.
Carbonic acid gas is especially referred to herein, but is merely given as an
example, any other gas having analogous properties would be considered as within
the scope of my invention, and the gas may compressed into, carried, and applied to
the tyre in either a solid, liquid, or gaseous condition.
When the carbonic acid is used in the form of a gas, but highly compressed, it is
carried in a receiver which need be only of very small size and provided with a
screwed nozzle having a male thread suitable for engagement with the interior of
the valve body above described, and also with a cock which may be opened when
filling the tyre & closed when the operation is finished.
When the carbonic acid is used in either the liquid or gaseous condition most of
the valves now in use would be applicable to my invention.
The principal advantages of my invention are as follows:-
(1) No air pump need be carried whilst riding thus reducing weight and dispensing
with the labour of numning

page_text: (2) Carbonic acid gas being more dense than ordinary air, is not so liable to
leak out.
(3) The tyre is automatically kept distended to its proper size & firmness.
Having now particularly described and ascertained the nature of my invention,
and in what manner it is to be performed, I declare that what I claim is :-
1. The combination of a pneumatic tyre and the special valve hereinbefore
described for the purposes set forth.
II. The use in a pneumatic tyre of a compressed gas substantially as hereinbefore
.described.
J. B. SCAMMELL.