Improvements in Valves for Pneumatic Tyres.
Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 18 of the Patents, &c. Act, 1883) as allowed by
the decision of the Chief Examiner of the 28th day of August, 1897.
Improvements in Valves for Pneumatic Tyres.
I, JABEZ CARTWRIGHT, of Upper Bar, Newport, Salop, Cycle Agent, do
hereby declare the nature of my said invention to be as follows:-
My invention has for its object improvements in valves for pneumatic tyres
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. My new valve is as follows:-:
The upper or projecting portion which forms the valve seat is screwed externally
to unite to an internal thread in the usual nipple which is secured to the air tube
and this usual nipple forms an external guard or casing for the head of the valve.
This same portion which forms the valve seat continues downwards and finishes
with an external screw thread suitable to unite with the air pump and it has a hole
sufficiently large to receive the stalk of the valve which passes down loosely leaving
an air space around the same. The upper end of the valve is formed by a nut
screwed on to a screwed neck on the valve stalk and the nut is recessed and
receives a rubber or other face. A casing is formed by preference of one piece
with the upper projecting portion to receive a coiled spring which is encased by a
lower gland having an internal collar for the spring to abut against and this casing
may be sealed by washers at the top and bottom. The gland is recessed at the
bottom to allow a cross pin fitted into the stalk of the valve to work freely. This
cross pin does not interfere with the valve outer seat as a slot is formed on each
side, this to allow freedom for the pin.
When the spring is in position its normal tendency is to press upon the cross pin
and so pull the valve tightly upon its seat.
When the pump is screwed on the nose of the pump tube it pushes up the gland.
and relieves the pressure of the spring upon the valve and so allows the valve to
easily lift from its seat in response to the pump and the valve is always open to
and subject to the pressure of air inside the tyre even when the pump is screwed
in, but immediately the pump is removed the force of the spring is upon the valve
to keep it permanently sealed against the escape of air. In some cases I may
however dispense with the spring by securing the gland internally so that by
unscrewing it the valve is locked from lifting when the pump is removed.
Dated this 10th day of April 1896.
GEORGE
BARKER,
77 Colmore Row, Birmingham, Agent for Applicant.

page_text: improvements in valves for rheumatic Tyres.
I, JABEZ CARTWRIGHT of Upper Bar Newport, 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 valves for pneumatic tyres
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.
In order that my invention may be clearly understood and more easily carried
into practical effect I have appended hereunto a sheet of drawings upon which I
have illustrated the various parts of my valve..
Figure 1 is a part sectional elevation of my valve fixed to the tyre.
Figure 2 is an enlarged sectional elevation showing the valve closed.
Figure 3 is an enlarged sectional elevation showing the nozzle of the inflater
attached and the valve open.
Figure 4 is an elevation of the valve body and seating.
Figure 5 is a cross section through the line a-b of Figure 4.
Figure 6 is a side elevation of the loose sleeve or slotted plug.
Figure 7 is a plan view of the same.
Figure 8 is a front sectional elevation of Figure 6.
Figure 9 is a side elevation of the valve and spindle or plunger.
Figure 10 is a plan view of same.
Figure 11 is a front elevation of Figure 9.
Figure 12 is an elevation of the spring which keeps the valve against its seating
when closed.
Figure 13 is a sectional elevation of a modified form of my valve.
In carrying my invention into practice I form the body B of my valve round
in the centre and with two flats the ends b2 and 63 are screw threaded and a
hole is drilled down the centre to receive the valve spindle S to the bottom end
of which is attached the valve s¹, the top end of this spindle is formed with an
enlarged flat s which fits between the slot p¹ of the loose sleeve or slotted plug P
which is placed over the top of the spindle, the shoulders and s resting upon
the bottom of the slot. The top of this loose sleeve or slotted plug protrudes
above the top of the valve body. Placed around the spindle between the bottom
end of the loose sleeve and the shoulder b formed in the interior at the bottom of
the body is the coiled spring N which keeps the valve up against its seating. The
bottom part 2 of the body is screwed into the usual hollow stem H which is
secured to the air tube as shown at Figure 1, the top part 63 receives the cap J
when the valve is closed for keeping the dirt from entering the valve as shown at
Figure 2 and the nozzle K of the inflater when inflating the tyre as shown at
Figure 3.
The action of my valve is as follows:-
When connecting the inflater to the valve body the shoulder k¹ formed in the
interior of the nozzle pushes the loose sleeve or slotted plug inwards thereby
compressing the spring and keeping it so compressed that it cannot recoil thus
allowing the valve spindle to move freely until the spring is again released by the
action of unscrewing the inflater. Therefore so long as the spring is kept
compressed by the action aforesaid the valve is enabled to easily lift from its seat
in response to the pump thus allowing the air to pass into the tyre and when the

page_text: inflater is detached and the spring is thus again brought into action it lifts the
loose sleeve or slotted plug up carrying with it the valve spindle thus forcing
the valve against its seating which effectually prevents the escape of air. At
Figure 13 I have shown a modification of my valve. In this case I form the
hollow stem W with a slot to near the top and screw threaded at its top and bottom
ends down the centre of which the spindle V passes with the valve attached to
the bottom. The bottom end of this hollow stem is screwed into the usual stem H
and attached to the top of this stem H is the body T. I then place the coiled
spring around the hollow stem in the interior of the body and over the top of
this spring I place the loose sleeve t the bottom part of which fits loosely into the
top of the body, the top end of the hollow stem passing through a hole formed in
the top, and this loose sleeve may be sealed by washers at the top and bottom. I
then pass the pin 2 through the slot wl and through the hole formned near the top
of the spindle the two ends resting in the recess formed in the top of the loose
sleeve.
To open the valve the nozzle of the inflater is screwed onto the top of the
hollow stem thus pushing the loose sleeve t down the interior of the body T thereby
depressing the spring and allowing the valve and its spindle free action or move-
ment in the slot formed in the hollow stem W. which allows the air to pass freely
into the tyre without the valve being influenced by the loose sleeve 2 or its spring
until the pump nozzle is removed, and when the inflater is disconnected the action
of the spring forces the loose sleeve upwards carrying with it the pin and also the
spindle by which means the valve is closed. In some cases I may dispense with the
spring and form an internal screw thread on the loose sleeve.
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:-
First The improvements in valves for pneumatic tyres and similar purposes
consisting essentially of the casing with the valve spindle mounted therein such
as S working up and down the said casing in the slot pl formed in the loose sleeve
such as P which sleeve protrudes above the top of the body and is forced inwards
by the nozzle of the inflater when connecting the same in the manner and for the
purpose substantially as hereinbefore described and shown on the accompanying
sheet of drawings.
Second: In valves for pneumatic tyres and such like purposes the construction,
combination and arrangement of the parts so that the act of attaching the air pump
removes the pressure of the sleeve P with its spring N off the valve allowing the
air to easily operate the valve from its seating substantially as herein described
and as shown upon the annexed drawings.
Dated this 5th day of January 1897
GEORGE BARKER,
77 Colmore Row, Birmingham, Agent.