Improvements in Valves for Pneumatic Tyres.
Year: 1895

page_text: Date of Application, 27th Feb.. 1895
Complete Specification Left, 27th Nov., 1895-Accepted, 27th Feb., 1896
PROVISIONAL SPECIFICATION.
Improvements in Valves for Pneumatic Tyres.
We, LOUIS AUGUSTE DESPONTS and PIERRE ACHILLE GODEFROY both of
55 Boulevard de Belleville, Paris, France, Cycle Manufacturers, do hereby declare
the nature of this invention to be as follows:-
Our invention relates to improvements in the valves employed for the inflation
of the pneumatic tyres of velocipedes and has for its object to provide a valve such
as while of minimum size shall be absolutely air-tight.
A valve according to our invention is illustrated by way of example in the
accompanying drawings,
Fig. 1 being an elevation;
Fig. 2 a section; and
Fig. 3 representing a detail hereinafter more fully referred to.
The valve is composed of a threaded tube a, fixed on the rim of the cycle, which,
in the type represented in Fig. 1, is provided with two concentric air-chambers bb.
The upper part of the tube a is formed with a cylindro-conical chamber e through
which the air, which enters by the tube e, passes. At the base of the tube e a
chamber is formed in which is arranged a metallic plate y perforated with holes h.
A disc of caoutchouc or the like split in the middle, is placed in the chamber f
where it can play freely between the plate g and the upper edge of the tube a.
In
order to prevent squeezing of this disc we insert in the open lower part of the
chamber, a washer k, whose periphery is circular but the inner edge of which is
formed with two straight parallel parts, as represented in Fig. 3. The upper end
of the tube a is on the outside also provided with two straight portions corresponding
to those of the washer so that, on occupying the position shown in Fig. 2 the
nut that fixes the tube e and the chamber, will not be able to turn further and
the disc i forming the valve can play freely.
Dated this 27th day of February 1895.
We, LOUIS AUGUSTE DESPONTS and PIERRE ACHILLE GODEFROY, both of
55, Boulevard de Belleville, Paris, France, Cycle Manufacturers, 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 invention relates to improvements in the valves employed for the inflation
of the pneumatic tyres of velocipedes and has for its object to provide a valve,
such as, while of minimum size, shall be absolutely air-tight.

page_text: A valve according to our invention is illustrated in the drawings filed with our
Provisional Specification,
Fig. 1 being an elevation;
Fig. 2 a section; and
Fig. 3 representing a detail hereinafter more fully referred to.
The valve comprises a screw-threaded tube a, adapted to be fixed to the wheel
rim and which, in the type represented in Fig. 1, extends into and communicates
with the two concentric air-chambers 6 and 6 of the tyre. The upper part of the
tube a is formed with a cylindro-conical chamber e through which the air, which
enters by the tube e, passes. At the base of the tube e, a chamber is formed in
which is fixed a metallic plate g through which holes are made. A supple disc i
of india-rubber or the like, slit in the middle, is placed in the chamber where it
can play freely against the plate g and within the upper edge of the tube a. The
disci, although shown in the drawings, for the sake of clearness, as a little distance
away from both the plate g and upper edge of the tube a, is, of course of sufficient
thickness to be held firmly by and between the same and the slit of the said disc
is located under the solid part of the plate g between the holes, the arrangement
being such that normally the slit is closed by the forcing of the disc i against the
plate g by the pressure of the air in the tube a but that when, in the operation of
inflating the tyre, air is forced through the tube e, it bends the central portion of
the disc i downwards and thereby opens or widens out the aforesaid slit to allow
the air to pass into and through into the tube a. In order to prevent injury to the
disc through the accidental relative rotation of the tubes e and a, we fix, as in a
bezil, in the open lower part of the chamber, a washer k, whose periphery is
circular but the inner edge of which is formed with two straight parallel parts, as
represented in the upper part of Fig. 3. The upper end of the tube a is on the
outside also provided with two straight parallel sides (see the lower part of Fig. 3)
corresponding to those of the washer k so that when the nut I, that fixes the tube e
on the tube a, is screwed down in order to clamp the edge of the disc between the
upper edge of the tube a and the perforated plate g, the tubes a and e will not be
able to turn relatively to each other.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. A valve for pneumatic tyre, wherein a disc i provided at its centre with a fine
perforation is arranged to be held at its edge by and between the end of a tube a
and a plate y provided with holes and carried by an inflation-tube e, substantially
as hereiubetore described with reference to the drawings.
2. In a valve of the kind specified in the preceding claim, the combination with
the tubes a ande of a washer having flat or straight parts as described, and
corresponding flat or straight parts on the tube a for the purpose of preventing
the tubes a and e from rotating relatively to each other when the nut is screwed
home, substantially as herein before described with reference to the drawings.
3. Our improved valve for pneumatic tyres, constructed arranged, and operating
as herein before described with reference to and shown in the drawings berein
referred to.
Dated this 27th day of November 1895.
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.