Improvements in Valves for Pneumatic Tyres and other like purposes.
Year: 1898

page_text: Date of Application, 1st Jan., 1898
Complete Specification Left, 1st Oct., 1898-Accepted, 10th Dec., 1898
PROVISIONAL SPECIFICATION.
Improvements in Valves for Pneumatic Tyres and other like
purposes.
We, JOHN EDWARD THORNTON, of Rokeby, Oldfield Road, Altrincham, in the
County of Chester, Manufacturer, and JAMES POLLARD LEA, of Worsley Mill,
Worsley Street, Hulme, Manchester, in the County of Lancaster, Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in valves for controlling the admission
of air to and the emission of air from pneumatic tyres or for other like purposes.
The improved valve consists essentially of several parts.
A. A stem or casing which is attached to the air tube and to the rim of the
wheel and need not differ materially in its form and method of attachment from
similar pieces in use with other valves for the purpose, several of which are
well known.
This casing has a passage through it which at the end entering the air tube is
advantageously first contracted and then gradually enlarged finally assuming the
form of an expanding cone. At this point sharp corners or edges are advan-
tageously avoided.
B. A valve consisting of a dise or ball or otherwise suitably formed piece of
indiarubber or other flexible material which is cemented or otherwise suitably
attached to a stem of metal.
The flexible valve and its supporting stem are formed so that the valve may
be readily pushed right through the passage in the stem A and in like manner it
may be withdrawn. The air has free passage past the stem.
C. A stop piece which is screwed firmly to the outer end of the stem or casing A.
The stem of valve B engages with this stop piece so that the movements of the valve
up and down (and particularly the latter) are limited by it.
The combined action of these parts is as follows.
Stem A being attached to the tyre, valve B may be pushed right through it and
secured definitely in position by the screwing up of the stop piece C. In this
position the valve B rests on and covers the conical opening in stem A. It is free
to rise to admit air and its action is similar to that of any non-return valve. The
flexible valve is prevented from being pushed back through the opening by the
pressure of the air it is retaining in the tyre by reason of the downward movement
of it's stem being limited by the top. The flexible valve is in these
circumstances supported partly on stem A and partly by it's own stem against
stop C. To deflate the tyre or to examine the valve, the stop C is unscrewed where-
upon the support to the flexible valve is withdrawn and the valve can be forced or
drawn through the opening it has previously been stopping.
which
D. A dust cap to close the air passage is advantageously fitted to stop piece C
and attached by a bent wire to the body of the valve or to the stop piece
when in position is practically a part of the body of the valve.

page_text: The wire engages with the dust cap in similar manner to the chain which is
at present generally used for the purpose, allowing of the necessary freedom of
rotation to the cap. The wire is bent to pass through a hole in a lug formed
on the stop-piece C, and is free to slide up and down to the necessary extent. Its
end is bent or enlarged to prevent its removal from the lug. When the dust cap
is unscrewed it may be swung out of the way to permit of the attachment of the
inflator.
This method of securing the dust cap obviates the swinging and oscillation of
a loosely hanging chain with it's friction often quickly resulting in the breakage
of the said chain.
D
2011 1
בד
1002
Improvements in Valves for Pneumatic Tyres and other like
purposes.
We, JOHN EDWARD THORNTON, of Rokeby, Oldfield Road, Altrincham, in the
County of Chester, Manufacturer, and JAMES POLLARD LEA, of Worsley Mills,
Hulme, Manchester, in- the County of Lancaster, Engineer, do hereby declare
the nature of this invention and in what manner the same is to be per-
formed, to be particularly described. and ascertained in and by the following
statement:-
The invention is designed to provide a valve for pneumatic tyres and other
pneumatic appliances in which the resistance in the valve itself to the admission
of air is practically nil, which can be readily opened for deflation, the plug of
which can be easily withdrawn and in a dust cap therefor which will not readily
become loose or detached.
It will be fully described with reference to the accompanying drawings. (For
the purposes of illustration these are drawn to a scale double the size of the
original.)
Fig. 1. Side elevation.
Fig. 2. Longitudinal section.
Fig. 2. Transverse section on line y-y.
Fig. 3. Transverse section, on line -x.
Fig. 4 Perspective view (full size).
Fig. 5. Perspective view of cap D removed (full size).
The stem or casing A is attached to the air tube in the usual way. Through
the stem A is a passage or port a for the passage of the air in either direction.
In the port or passage a is placed a rod B, which at one end is fitted with a disc
(or other) valve b of a diameter sufficient to cover the inlet end of the port a in the
stem A. The valve b is preferably a small disc of rubber fitted between two
collars 61 62 on the end of the rod or stem B to which it is secured by cement, or
otherwise.
The valve rod B is preferably triangular in section or of other suitable shape to
permit of a current of air passing through the port beside it and is provided at
the outer end with a head or bent end & fitting into a slot a¹ in the side of the
casing to prevent it travelling too far into the port a.
The form of the valve b and the end of the rod B supporting it permits of its
being readily pushed right through the port a in the casing A and also of
being withdrawn in a similar manner when required. On account of the small

page_text: area of the valve b, however, the pressure in the air tube when inflated is not
sufficient to force it back past its seat.
The casing A is formed with a screw thread for the greater part of its length,
but at the outer end is for a portion of its length at C made of considerably less
diameter with a collar c of the same diameter as the screwed part of the casing
and with a screw thread of similar pitch and diameter thereon. From the collar c
to the end of the casing is provided a screwed nozzle c¹ to receive the end of the air
pump for inflating.
A dust cap D to close the inlet end of the air port or passage a is attached to the
casing A of the valve by a thin strip or wire d (one at each side). The strips or
wires d engage at one end with the cap D and the wire at the end is attached
to a ring or collar d with internal screw thread corresponding to the external
thread on the casing A and collar c. The ring d can only pass over the collar c
by being rotated or screwed over it and it is then in the position shown in Fig. 4
which leaves the end of the nozzle c¹ free to engage the end of the air pump. The
cap D is adjusted over the end of the nozzle c¹ by screwing the ring d' over the casing A
until the inner edge of the cap abuts against the collar c.
This method of securing
the dust cap obviates the swinging and oscillation of a loosely hanging chain with
its friction often quickly resulting in the breakage of the said chain.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. A valve for inflating pneumatic tyres and other like purposes comprising in
its construction a tubular casing provided with internal air port or passage, a valve
rod or spindle placed therein with a flexible valve cemented or attached thereto
capable of being pushed or drawn through the port, substantially as described.
2. A valve for pneumatic tyres having the several parts constructed and arranged
in combination, substantially as described and shown.
3. In a valve for pneumatic tyres a dust cap constructed and arranged, sub-
stantially as described and shown.