Improvements in and relating to Pneumatic Tyres.
Year: 1892

page_text: Date of Application, 6th Dec. 1892
Complete Specification Left, 6th Oct., 1893-Accepted, 11th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to Pneumatic Tyres.
I ARTHUR COMINGS HIDE of Ivy Villa, Harewood Road, Merton, in the
County of Surrey, Manager of Works, do hereby declare the nature of this
invention to be as follows:
My invention relates to a safety valve for pneumatic tyres, the object being, to
relieve the pressure of air within a tyre when it exceeds any given desired point
which can be determined at the will of the rider.
The valve consists of a tubular stem fixed to the tyre by means of a flange and
lock nut in the usual manner. The outer end of this tubular stem is enlarged to
receive a plug preferably cone-shape fitting on a similar shaped seating in the
stem and adapted to form therewith a valve. This valve is kept up to its seating
by means of a coiled spring acting against it and against an adjustable plug screwed
into the open end of the stem of the valve, which adjustable screwed plug provides
a means of adjusting the elasticity of the spring and it is locked in the desired
position by means of a secoud screw plug or its equivalent. One or more small
holes are either formed through the side of the tubular stem of the valve, or through
the adjustable and locking plugs for the purpose of allowing the escape of air after
it has passed the valve.
This construction is capable of many modifications such as the shape of the
valve proper,
and the application of the spring to determine pressure under which
it shall give way.
11002
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
, Chancery Lane, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Pneumatic Tyres.
I, ARTHUR COMINGS HIDE, of Ivy Villa, Harewood Road, Merton, in the
County of Surrey, Manager of Works, 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 :-
My invention relates to an improved construction of safety or release valve for
pneumatic tyres, and it consists of a spring controlled valve capable of being
adjusted to blow off or release the air at any desired pressure, the object being to
prevent the bursting of the tyre through over pressure by automatically releasing
the air when any predetermined pressure is exceeded.
I attain this end by the construction of valve shown in the accompanying
drawing, in which :--
Figure 1 is a view in side elevation of one form my valve may assume.
Figure 2 is a view in plan thereof.
Figure 3 is a view in sectional elevation thereof, and
Figure 4 is a view in sectional elevation of a modification in the construction of
my improved valve.
Throughout the views similar parts are marked with like letters of reference.
My improved valve consists essentially of a tubular stem A adapted to be fixed
to the air tube of the tyre by means of its flange "a," and a lock nut "a¹,” and

page_text: washer "a" in the manner now well-known. The valve may either consist of a
flat flange B carried by a stem B', as shown by Figure 3, or of a cone B carried
by a similar stem B', as shown by Figure 4. In the former case the seating of the
valve preferably consists of a raised ring C cut or formed in a shoulder formed in
the tubular stem A, the valve B being faced with a washer "b" of leather or
rubber, while in the latter case the seating C of the valve consists of a leather or
rubber washer C seated on a shoulder cut or formed in the tubular stem A. The
valve B is kept down to its seating by a spring D surrounding the stem B¹ of the
valve, the tension of which is capable of being adjusted either by means of a cap E
adapted to screw on to the outside of the stem of the valve A as shown by
Figure 3, or by means of a plug E adapted to be screwed into the interior of the
stem A of the valve as shown by Figure 4, the said cap or plug being locked to
the stem A after adjustment by means of a lock nut F. I do not limit myself to
the use of any particular construction of spring, but I prefer to use a helical one,
or two such springs placed one within the other. The stem B' of the valve is
marked with suitable marks denoting the pressure at which the valve will blow off,
the said marks being read by the top of the cap or plug E. This allows the valve
to be set to blow off at any given pressure without the use of a pressure guage.
These marks are preferably made on a flat "41" cut on the stem B' to provide
a space for the escape of the air out of the valve, but if preferred a small
hole may be made through the side of the tubular stem of the valve for the
escape of the air.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction hereinbefore described and illustrated by the accompanying
drawing, but that I hold myself at liberty to make such changes and alterations as
fairly fall within the spirit and scope of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. The improved construction of safety or release valve for use with pneumatic
tyres, substantially, as set forth.
2. In a safety or release valve for use with pneumatic tyres, marking or
graduating the stem of the valve so that the adjusting cap or plug can be
regulated to set the valve to blow off at any given pressure without the use of
a pressure guage, as set forth.