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

page_text: Date of Application, 8th May, 1897
Complete Specification Left, 14th Oct., 1897-Accepted, 26th Mar., 1898
PROVISIONAL SPECIFICATION.
Improvements in and relating to Valves for Pneumatic Tyres and
the like.
I, THOMAS HARRISON, of Countess Avenue, Whitley, in the County of North-
umberland, 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 means whereby valves of the kind described in my previous
Patent Application No. 5605 of 1897 and valves having adjustable inner parts
carrying valves may be arranged to automatically adjust themselves for inflation by
the act of putting and as soon as the inflator is in position for use, and returned to
position on its removal.
According to the present invention the inner tube or part carrying the stop valves
is arranged to be kept in closed or normal position by a spring of sufficient strength
to resist any pressure which may arise, in ordinary use, within the tyre but not of
sufficient strength to resist a pressure which would burst the tyre, it thereby acting
as a safety valve.
Or, I may form the projecting part of the inner tube, or valve carrying part,
with reversely screwed parts as hereinafter described.
The inner tube or valve carrying part is formed with suitable shoulders or parts
to receive the thrust of the spring and has, as described in my previous Patent
Application referred to a reduced part seated upon a washer in an outer cap or nut,
the latter in the present arrangement being formed a loose fit upon the outer casing
or adapted to slide thereon for a suitable distance so that on screwing on or fitting
the inflator nozzle the said cap comes against the casing and closes the outer stop
valve of the inner tube; at the same time the inner tube or part is drawn back
against its spring and the inner stop valve is opened. When the inflator is with-
drawn the inner tube and outer cap immediately return to position under action of
the spring and shut the inner valve.
I may in some cases secure the same automatic effect of opening and closing of the
inner stop valve by forming the outer screwed part of the inner tube or part, partly
with a right and partly with a left handed thread whereby the act of screwing on
the inflator nozzle will unscrew and withdraw the inner tube a sufficient distance
to open the inner and shut the outer stop valves the reverse taking place on the
removal of the inflator; a suitable fixed part and washer are provided upon the inner
tube extension for receiving the nozzle and assisting the operation of opening and
shutting the valve.
The usual dust cap is so fitted that it shall not operate the valve in the act of
putting on or removing same.
By the application of the above arrangements to valves of the kind described the
necessary unscrewing and screwing up of the outer adjusting nut is dispensed with
or accomplished in the act of applying or removal of the inflator and prevents the
valve being left open by accident or oversight at any time.
Dated this 7th day of May 1897.
PRYOR & HARVEY,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Valves for Pneumatic Tyres and
the like.
I, THOMAS HARRISON, of Countess Avenue, Whitley, in the County of North-
umberland, 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 means whereby valves of the kind described in my previous
Patent No. 5605 A.D. 1897 and valves having adjustable inner parts carrying valves
may be arranged to automatically adjust themselves for inflation by the act of
putting on the inflator and as soon as the inflator is in position for use, and be returned
to position on its removal.
According to the present invention the inner tube or part carrying the stop valves
is arranged to be kept in closed or normal position by a spring of sufficient strength
to resist any pressure which may arise, in ordinary use, within the
tyre but not of sufficient strength to resist a pressure which would
burst the tyre, it thereby acting as a safety valve. Or I may form
the projecting part of the inner tube or valve carrying part with
reversely screwed parts as hereinafter described.
The said valve carrying part is in both cases arranged for operation by the putting
on and removal of the inflator as hereinafter described.
I will now describe my invention in reference to the accompanying drawings in
which Figures 1 and 2 are sectional views showing respectively the first and second
described form of the invention.
Referring to Fig. 1A is the outer casing having the usual means as at a for
attachment to the tyre, the inner tube or valve carrying part T is formed with
suitable shoulders or parts to receive the thrust of the spring Z and it has a
reduced part forming the outer stop valve S seated upon a washer in an outer nut
or cap
Nas shown in Fig. 2; or the externally reduced part may be dispensed with
and the outer stop valve formed as in Fig. 1 by a washer W carried by the nut N
and adapted to receive and make a tight joint with the nozzle i of the inflator, and
the ball valve R¹ when arranged within the inner tube is seated upon an internally
reduced part of the tube T as at 3, Fig. 1. This screwed extension in the present
arrangement is formed a loose fit in the casing or adapted to slide thereon or therein
for a suitable distance so that on application and screwing on of the inflator nozzle i
the tube extension will be screwed into the nozzle (which is made of suitable length
for the purpose) and the valve V withdrawn from its seat against the action of the
spring at the same time shutting the outer stop valve S, see Fig. 2 or equiva-
lently the washer W makes an air tight joint with the nozzle i see Fig. 1.
can now be pumped into the tyre past the non-return valve R through the
apertures and the inner stop valve V.
Air
The act of unscrewing the inflator nozzle after inflation allows the inner tube T
to return to position under action of spring Z and the inner valve V is shut.
A pin and guide such as or a squared part is provided to prevent the part T
from turning in the casing during operation.
I may in some cases secure the same automatic effect of opening and closing of
the inner stop valve V by forming the outer screwed part of the inner tube or valve
carrying part T partly with a right and partly with a left-handed thread as shown
at and respectively in Fig. 2 whereby the act of screwing on the inflator
nozzle will unscrew and withdraw the inner tube T a suitable distance to open the
inner and shut the outer stop valve, when the tyre may be inflated. A suitable

page_text: part E is provided and fixed upon the inner tube extension at the junction of the
reversely threaded parts for receiving the nozzle end and assisting the operation.
After inflation on unscrewing the nozzle, the latter being tightly pressed against
the part E, (which may be provided with a washer w) carries it and the tube T
with it therefore at the same time screwing up the latter until the valve V comes
upon its seat, continued movement disengages the nozzle from the part E and the
nozzle is unscrewed and removed. The outer surface of the part E is screwed with
a thread of the same kind as that upon the part t so that the screwing up of the
dust cap shown at X thereupon, if at all, assists to shut and keep the valve V tight,
and the valve may be opened or operated for use of the inflator by unscrewing the
dust cap but should this fail, the act of screwing on the inflator nozzle will completo
the operation.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is;-
1. In valves of the kind described an inner valve carrying part having its screwed
extension mounted loosely or adapted to slide within the outer casing and kept
with the valve in a closed position against the air pressure within the tyre by a
spring or springs so that the act of putting on and removal of the inflator nozzle
shall serve to open and shut the valve substantially in the manner and for the
purposes set forth.
2. In valves of the kind described or valves for pneumatic tyres and the like
having internal valve carrying parts the use for the purpose specified
of a reversely screwed extension of the inner tube or valve carrying
part with fixed part at the junction of the reverse threads, said fixed
part having a screwed outer surface for receiving the dust cap substantially
in the manner set forth.
6. In valves of the kind described the use in combination with an inner tube
or valve carrying part of an extension of the same having reversely screwed parts
substantially as and for the purposes set forth.
4. The combination of parts forming an improved valve for pneumatic tyres
arranged and adapted for operation substantially as herein described and illustrated
in Fig. 1 of the drawings.
5. The combination of parts forming an improved valve for pneumatic tyres
arranged and adapted for operation substantially as herein described and illustrated
in Fig. 2 of the drawings.