Improvements in or relating to Pneumatic Tyre and other Valves.
Year: 1897

page_text: Date of Application, 7th May, 1897-Accepted, 12th June. 1897
COMPLETE SPECIFICATION.
Improvements in or relating to Pneumatic Tyre and other Valves.
A communication from JULIUS MOHS, of Brandenburg-on-Navel, in the Empire of
Germany, Engineer.
1, ALFRED JULIUS BOULT, of 111, Hatton Garden in the County of Middlesex,.
Chartered Patent Agent 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 well-known valves provided with elastic seats for valves or valve-cones for
facilitating the work of inflation of pneumatic tyres and other purposes have the
drawback, that the counter or back pressure of air acts too strongly on the valve--
cone and valve-seats, whereby the lifting of the valve-cone during inflation is still very
difficult. Inflation is still more difficult when valves are employed in which a
rubber or elastic tube is stretched over an air-supply tube to regulate or prevent.
admission or emission of air; the expansion of a stretched tube over an air-conduit
making the inflation of pneumatic tyres so much more difficult, that pumping with.
such valves can be flected only with great effort.
To obviate these drawbacks, according to the present invention, an elastic valve-
having an expansible slot is used to facilitate admission of air into pneumatic tyres,
said slot preventing the air from escaping by closing when pressed externally by
the air contained in the tyre and inflation against the contained air is effected quite-
easily.
In the accompanying drawing such a valve is illustrated in longitudinal.
section,
Figs. 1 and 2 showing two different constructions according to the present.
invention. The valve consists of a rubber or elastic bag or tube a provided with
a slot or slots b. When the air is forced through the air inlet tube c into the bag a,.
the elastic mouth or slot & opens and allows air to enter the tyre, as shown in Fig. 1..
As soon as inflation ceases, the elastic lips of the slot instantly come together and
prevent the air from escaping.
It is important that the rubber bag or tube should be sufficiently thick relatively
to the length of the slot, that it will not be compressed by the external air-.
pressure.
It must also be pointed out, that this valve may be used for pumping liquids and
for other purposes and that the shape of the valve with its mouth-like elastic lips
may be varied, as for instance as shown in Fig. 2. The valve is preferably secured.
by forming the end of the air inlet tube spherical and passing the upper end of the
bag or tube over it, the whole being firmly secured to the tubular valve casing by
a screw cap, as shown.
Having now particularly described and ascertained the nature of the said
invention, as communicated to ne by my foreign correspondent, and in what
manner the same is to be performed, I declare that what I claim is :-
1. An elastic non-return valve consisting of a rubber-tube or bag having a slot
or slots in its wall substantially as described.
2. An elastic valve of the character described consisting of an elastic bag or

page_text: tube provided with a slot or slots, in such manner, that the air pressure upon the
outer surface of the bag presses the lips of the slot or slots together without
flattening the tube substantially as described.
3. The combination and arrangement of parts constituting the complete valve
substantially as described and illustrated in Figure 1 or in Figure 2 of the 5
accompanying drawings.
BOULT & WADE,
Agents for the Applicant.