Improvements in Valves for Pneumatic Tyres and the like.
Year: 1897

page_text: Improvements in Valves for Pneumatic Tyres and the like.
I, THOMAS HARRISON, of Countess Avenue, Whitley in the County of Northumber-
land, Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to valves for pneumatic tyres and the like and has for its object
to provide a valve more reliable and efficient for the purpose than those hitherto in
use and by which leakage is prevented and the inflation and deflation of the tyre
more easily and readily accomplished.
To this end, and according to my invention I arrange within the valve casing three
valves, two stop valves and one non-return valve the former controlling the inner
passage to the air tube and an outer passage to the atmosphere and also adapted for
deflation of the tyre as hereinafter described; and the latter non-return valve con-
trolling the air admission from the inflator.
In such an arrangement I provide within the valve carrying tube or casing an
inner tube of less diameter than the interior of the casing and having at its inner end
a stop valve of vulcanized fibre or other suitable material, seated in the casing and
controlling the admission and outlet of air to and from the air tube; at its outer end
this inner tube has another stop valve which may be formed by suitably reducing the
tube, its seat being formed by a washer of vulcanized fibre or suitable material carried
by, or a specially formed part of, the casing, or an external adjusting nut screwing
upon the outer casing and upon the inner tube which latter passes outward and is
formed for reception of the inflator. Within the inner tube is arranged a spring
pressed non-return valve of ebonite or suitable material adapted.to pass air into the
inner tube on operation of the inflator, for the use of which .the adjusting nut is
unscrewed sufficient to shut the outer and open the inner stop valve, from the inner
tube the air passes by apertures formed in the walls thereof to the space between it
and the outer tube or casing and past the inner stop valve to the air tube.
When the tyre is inflated the external nut is screwed up tight shutting the inner
stop valve and effectually securing the air within the tyre; a similar result is obtained
when the nut is screwed tightly down closing the outer and opening the inuer stop
valve the non-return valve being held tightly upon its seat by its spring and by the
air pressure thus providing an alternate or an additional means for preventing leakage
of the air from the tyre.
When it is desired to deflate the tire all that is necessary is to half unscrew the
adjusting nut when both inner and outer stop valves being half open the air can
escape.
The valve casing is secured to the tyre or air tube in any convenient manner and
the usual screwed dust cap and locking nut are provided.
Noted L: ሳ' '
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page_text: Improvements in. Valves for Pneumatic Tyres and the like.
I, THOMAS HARRISON, of Countess Avenue, Whitley in the County of Northumber-
land, Engineer 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 valves for pneumatic tyres and the like and has for its object
to provide a valve more reliable and efficient for the purpose than those hitherto in
use and by which leakage is prevented and the inflation and deflation of the tyre
more easily and readily accomplished.
To this end, and according to my invention I arrange within the valve casing three
valves, two stop valves and one non-return valve, the former controlling the inner
passage to the air tube and an outer passage to the atmosphere and also adapted for
deflation of the tyre as hereinafter described; and the latter non-return valve con-
trolling the air admission from the inflator.
Such an arrangement I will describe in reference to the accompanying drawings
in which Figures 1 and 2 are sectional elevations of a valve constructed in accordance
with my invention.
A is the valve casing having the usual means as shown at a for securing same to
the tyre or air tube; within the casing A is an inner tube T of less diameter than the
interior of the casing A forming an intervening annular space a' the said tube T
having at its inner end a stop valve V of vulcanised fibre or other suitable material
seated in an appropriately formed part of the casing as at V₁ and controlling the
admission of air to and from the air tube by the passage P.
At its outer end the inner tube T has another stop valve S which may be formed
by suitably reducing the tube Tas at t its seat being formed by a washer of vulcanised
fibre or other suitable material such as W carried by, or a specially formed part of
the casing, or an external nut or cap N screwing upon the outer casing and upon the
inner tube T. The washer W also serving to make a tight joint between the outer
casing and the nut or cap N.
The inner tube T passes outwards as at t' and is screwed or otherwise formed for
reception of the inflator and carries an adjusting nut N'.
Within the inner tube is arranged a non-return valve of ebonite, brass, steel or
suitable material with spring r as in Figure 1 or I may employ a ball or other kind
of non-return valve. This valve has its seat at the reduced part t of the inner tube T
and is adapted to pass air into the inner tube by the passage PI on operation of the
inflator for the use of which the adjusting nut N¹ is unscrewed sufficient to shut
the outer stop valve S and open the inner stop valve V as shown in Figure 1, from the
inner tube T, the air passes by apertures 6 in the walls thereof to the space a', past the
inner stop valve V to the air tube, its return being prevented by the non-return
valve R and the outer stop valve S.
When the tyre is inflated the external nut N¹ is screwed up tight shutting the inner
stop valve V and effectually securing the air within the tyre; a similar result is
obtained when the nut N' is screwed tightly down as in Figure 1 closing the outer
and opening the inner stop valve S, the non-return valve R being held tightly upon
its seat by its spring or the air pressure thus providing an alternative or an additional
means for preventing leakage of the air from the tyre.
When it is desired to deflate the tyre the adjusting nut N¹ is half unscrewed as
shown in Figure 2 when both the inner and outer stop valves being half open the air
can escape by the screw thread of the part t or suitable passages may be provided.
The valve casing is secured to the tyre or air tube in any convenient manner and
the usual screwed dust cap is provided.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In valves for pneumatic tyres and the like the use of three valves two stop valves
and one non-return valve the former controlling an inner passage to the air tube and
an outer passage to the atmosphere, and also adapted for deflation, and a non-return
valve controlling the air admission from the inflator substantially in the manner set
forth.
2. The improvements in valves for pneumatic tyres and the like comprising an inner
tube within and of less diameter than the interior of the outer casing a non-return
valve spring pressed or otherwise within the inner tube the latter having apertures in
its walls and carrying a stop valve at either end all arranged and adapted for operation
substantially in the manner and for the purposes set forth.
3. A valve for pneumatic tyres and the like comprising the combination of parts
constructed, arranged and adapted for use substantially as herein described and
illustrated in the accompanying drawings.
Dated this 7th day of April 1897.
For the Applicant,
HENRY A. PRYOR,
3 St. Nicholas' Buildings, Newcastle-on-Tyne, Chartered Patent Agent.