Improvements in Air Valves for Pneumatic Tyres and similar purposes.
Year: 1897

page_text: Date of Application, 26th Aug., 1897
Complete Specification Left, 24th May, 1898-Accepted, 20th Aug., 1898
PROVISIONAL SPECIFICATION.
Improvements in Air Valves for Pneumatic Tyres and similar
purposes.
I, JABEZ CARTWRIGHT, of Upper Bar, Newport, in the County of Salop, Cycle
Agent, do hereby declare the nature of my said invention to be as follows:-
My invention has for its object improvements in air valves for pneumatic tyres
and similar purposes which are designed to readily and easily admit the air
pressure from the pump or its equivalent and to securely keep or seal the air in
the tyre so that escape through the valve is practically impossible without the
use of rubber which so soon perishes and causes leakage.
In carrying my invention into practice I form my valve body hollow with a
head at the end which fits into the air tube. At the top of this head I form a
recess larger in diameter than the bore of the body so as to form a rebate at the
bottom and into this recess I screw or otherwise fix a cap or plug provided with
a small hole in the centre through which the air passes from the valve into the
tyre. Placed under this cap and resting upon the rebate is a leather washer
having a hole in the centre which forms an air tight junction between the cap
or plug and its seating. Fitted into the interior of the body from the opposite
end is what I call the valve stem consisting of a hollow spindle screwed at its lower
end and formed larger in diameter at its upper end with two flats and a collar above
and around these flats, and resting against the collar I place a spiral spring, the
other end of which bears against a sleeve with a flange or enlargement at its lower
end and two slots at its upper into which the thin end of the spindle fits freely
and is prevented from revolving or turning by the flats fitting into the slots in
the sleeve. This sleeve is held in position by a screwed collar which screws on to
the end of the hollow spindle and bears against the enlarged end of the sleeve
and is used for connecting the nozzle of the inflater to the valve. Fixed on to the
top end of the hollow spindle is a cap perforated at the sides near the top end and
in the interior of this cap I place a non-return valve which may be cone or other
shape for closing the orifice of the hollow spindle. This non-return valve is free
to lift from its seating in response to the air from the inflater as it passes through
the valve into the tyre and to close by the pressure of air from the tyre.
The valve stem is now fitted into the body by screwing it on to the sleeve until the
end of the body bears firmly against the flange or enlargement on the sleeve and
compresses the spring, at the same time forcing the top end of the stem firmly
against the leather washer at the top of the body, thus closing the orifice of the
valve and making a perfectly air tight connection. To open my valve the nozzle
of the inflater is screwed tightly on to the collar at the end of the hollow spindle,
thereby drawing the spindle and the cap outwards and away from the leather
washer at the top of the body, thus allowing the air to pass freely into the tyre.
T 0541 den of Anouct 1807
.
GEORGE BARKER,
Agent for Applicant, 77, Colmore Row, Birmingham.

page_text: Improvements in Air Valves for Pneumatic Tyres and similar
purposes.
I, JABEZ CARTWRIGHT, of Upper Bar, Newport, in the County of Salop, Cycle
Agent, do hereby declare the nature of my said 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 has for its object improvements in air valves for pneumatic tyres
and similar purposes which are designed to readily and easily admit the air
pressure from the pump or its equivalent and to securely keep or seal the air in
the tyre so that escape through the valve is practically impossible without the
use of rubber which so soon perishes and causes leakage.
In carrying my invention into practice I form my valve body hollow with a
head at the end which fits into the air tube. At the top of this head I form a
recess larger in diameter than the bore of the body so as to form a rebate at the
bottom and into this recess I screw or otherwise fix a cap or plug provided with
a small hole in the centre through which the air passes from the valve into the
tyre. Placed under this cap and resting upon the rebate is a leather washer
having a hole in the centre which forms an air tight junction between the cap
or plug and its seating. Fitted into the interior of the body from the opposite
end is what I call the valve stem consisting of a hollow spindle screwed at one end
and formed larger in diameter at its upper end with two flats and a collar above
and around these flats and resting against the collar I place a spiral spring the
other end of which bears against a sleeve with a flange or enlargement at its lower
end and two slots at its upper, into which the thin end of the spindle fits freely
and is prevented from revolving or turning by the flats fitting into the slots in
the sleeve. This sleeve is held in position by a screwed collar which screws on to
the end of the hollow spindle and bears against the enlarged end of the sleeve
and is used for connecting the nozzle of the inflator to the valve. Fixed on to the
top end of the hollow spindle is a cap perforated at the sides near the top end and
in the interior of this cap I place a non-return valve which may be cone or other
shape for closing the orifice of the hollow spindle. This non-return valve is free
to lift from its seating in response to the air from the inflator as it passes through
the valve into the tyre and to close by the pressure of air from the tyre.
The sleeve is now
screwed into the body until the end of the body
bears firmly against the flange or enlargment on the sleeve and
compresses the spring at the same time forcing the top end of the stem firmly
against the leather washer at the top of the body thus closing the orifice of the
valve and making a perfectly air tight connection. To open my valve the nozzle
of the inflator is screwed tightly on to the collar at the end of the hollow spindle
thereby drawing the spindle and the cap outwards and away from the leather
washer at the top of the body thus allowing the air to pass freely into the tyre.
In order that my invention may be clearly understood and more easily carried
into practical effect I have appended hereunto a double sized sheet of drawings
upon which I have illustrated examples of my improved valve.
Figure 1 is an elevation of my valve complete.
Figure 2 is a sectional elevation of Figure 1 shewing the valve closed.
Figure 3 is a similar view to Figure 2 shewing the valve open and the end of
nozzle of an inflator attached. -

page_text: Figure 5 is a view of the valve stem with the spring and cup removed.
Figure 6 is a plan view of the sleeve shewing the slots.
Figure 7 is a view of the loose plug which forms the non return portion of the
valve.
Figure 8 is a similar view to Figure 2 shewing a modified form of my valve.
Figure 9 is a view of the valve shewn at Figure 8 with the outer casing
removed.
Figure 10 is a view of the stem of the valve as shewn at Figure 8 with the
spring and cap removed.
Figure 11 is a plan view of the sleeve.
Figure 12 is a view of the loose pin which forms the non return portion of the
valve as shewn at Figure 8.
In carrying my invention into practice I form my valve body A hollow with
the head a¹ at that end which fits into the air tube of the tyre or the like. At the
upper part of the head I form the recess a² larger in diameter than the bore of
the body so as to form a rebate at the base and into this recess I screw or otherwise
fix the cap or plug a³ provided with a small hole in the centre for admitting the
air from the valve into the tyre. Placed under this cap or plug and resting on
the base of the recess a² is the leather washer at having a hole in its centre to
correspond with the hole in the plug and this washer forms an air tight junction
between the plug and its seating.
Fitted into the interior of the body A. from the opposite end is what I call the
valve stem consisting of the hollow spindle B screw threaded at the end b the
opposite end being formed larger in diameter and having two flats 62, b2 formed
thereon with the collar 63 above and around these flats and butting against the
collar 3 I place the spiral spring S the other end of which butts against the end
of the sleeve D) which screws into the end of the body A and this sleeve is formed
with the head or enlarged at the other end d¹ the edges of which are milled or
roughened. The washer 2 is provided so as to form an air tight junction between
the end of the body A and the part d'. The smaller end of the spindle B fits freely
into this sleeve and is prevented from turning therein by the flats 63, 62 fitting
into the slots d³ ³ formed in the end of the sleeve which butts against the
spring S. Instead of the sleeve D screwing into the body A it may be screw
threaded internally and provided with an internal hollow projection having two
slots for the flats 62 to fit into and this sleeve would then fit into the body A thus
dispensing with the internal screwing of the body. I then fix the screwed collar b
on to the screwed end b¹ of the spindle so as to butt against the enlarged end or
head of the sleeve D at the same time slightly compressing the spring S by
which means the enlarged end of the sleeve is kept well against its seating and
this screwed collar forms the shank on to which the inflator nozzle F screws when
inflating the tyre or the like. Fitted on to the end of the spindle B above the
collar 63 is the cap 65 which is perforated at P at the sides preferably near the upper
end and in the interior of this cap I place the conical headed plug 66 the head
of which fits loosely into the end of the spindle which is cone shaped for that
purpose as clearly shewn at Figure 2. This conical shaped plug forms the non
return portion of my valve that is to say it closes the orifice of the hollow spindle B
by the pressure of air in the interior of the article being inflated and is free to
lift from its seating in response to the pressure of air from the inflator as it passes
through the valve into the tyre or the like.
When the valve stem is screwed
into the body the upper end of the stem or the head of the cap 5 fits firmly
against the leather washer at thus closing the orifice of the valve and making an
air tight connection. To open the valve the nozzle F of the inflator is screwed
tightly on to the collar 64 against the washer 610 thereby drawing the spindle and
consequently the cap outwards and away from the leather washer a and com-
pressing the spring S as clearly shewn at Figure 3 thus allowing the air to pass
freely into the tyre. When the nozzle of the inflator is disconnected the spring S

page_text: forces the spindle and cap back again into its normal position thus closing the
orifice of the valve.
At Figures 8 to 12 I have shewn a modified form of my valve. In this case
I dispense with the cap or plug in the head a' of the valve body A and in the
interior of this body I form the projection as having a hole through the centre
for admitting the air from the valve into the tyre or the like and against this
projection the solid end of the cap 65 fits the said cap being formed at this end
with a recess into which the leather washer 67 fits for forming an air tight junc-
tion between the cap and the projection a. The hollow spindle B is formed with
the projections 68 which fit into the slots d³ ³ of the sleeve D the screwed end 69
of the spindle passes through this sleeve which screws into the body A in the same
manner as shewn at Figure 2 the washer which fits between forming an air
tight junction.
The end 69 of the spindle forms the shank on to which the nozzle of the inflator
fits. When the sleeve D is screwed into the body A it slightly compresses the
spring and as the other end of this spring bears against the cap 65 it is forced
tightly against the projection a thus closing and sealing the orifice of the valve.
To open the valve the inflator nozzle is firmly screwed on to the end 69 against the
washer 10 which forms an air tight junction by which means the spindle B and
consequently the cap. 65 are drawn outwards and away from the projection a6 and
the spring compressed thus allowing the air to pass freely out. The loose pin 611
which fits into the end of the hollow spindle forms the non return portion of my
valve, that is to say it closes the orifice of the hollow spindle by the pressure of
air in the interior of the article being inflated and is free to lift from its seating
in response to the pressure of air from the inflator as it passes through the valve
into the tyre or the like. When the inflator nozzle is disconnected the spring
forces the spindle inwards thereby firmly pressing the end of the cap 65 against
the projection a by which means the valve is effectually closed.
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: :-
CLAIMS.
First The improvements in valves for pneumatic tyres and similar purposes
consisting essentially of the casing A having a cap or plug such as a fitted into
the head and bearing against the washer at in combination with the moveable
spindle such as B working up and down in slots formed in the sleeve D and
having a perforated cap which is held against the washer by the spring S
and operated in the manner and for the purpose substantially as herein set forth
and as shewn upon the accompanying sheet of drawings by Figure 1 to 7.
Second: In valves for pneumatic tyres and such like purposes the casing such
as A either with or without the projection such as a in combination with the
moveable spindle B working up and down in slots da formed in a sleeve D or
their equivalents and having a cap such as fitted at its end with the washer 67
the said cap being held against the outlet of the valve by the spring S in the manner
and for the purpose substantially as herein set forth and as shewn upon the
drawings by Figures 8 to 12.
Third: The new valve consisting of a centre spindle B closed by a spring
and fitted with a cap piece constructed to seal the inlet hole into the tyre in com-
bination with a non return valve and with the outer casing A and sleeve head
the whole being constructed so that the pump nozzle relieves the pressure of the
cap of the spindle when screwed thereon substantially as herein set forth and as
shewn upon the drawings by Figures 1 to 12.
Fourth In valves for pneumatic tyres and such like purposes the construction
combination and arrangements of parts so that the action of attaching the air
pump removes the pressure of the cap 65 with its spring off the outlet of the valve

page_text: allowing the air to pass freely out in the manner substantially as herein set forth
and as shewn upon the accompanying sheet of drawings.
JABEZ CARTWRIGHT.
By George Barker,
Fellow of the Chartered Institute of Patent Agents,
Agent for Applicant, 77, Colmore Row, Birmingham.