An Improved Method of Fixing Air Valves to Pneumatic Tyres, and Air Tubes for'same.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
An Improved Method of Fixing Air Valves to Pneumatic Tyres, and
Air Tubes for'same.
I, ISAAC BARTON, of Prenton Water Works, Prenton, Birkenhead, Cheshire,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to the method of fixing air valves to the air tubes of
pneumatic tyres. At present it is usual to form a round head on the air valve
which is inserted through a suitable hole in the air tube, and the joint is made
by grinning the air tube between the said head and a washer by the pressure of
a nut threaded on the screwed part of the air valve. When the joint is made
in this way it is necessary to strengthen the air tube near the joint by means
of a canvas backing and leakage very frequently occurs at this joint which is
very difficult to repair; and as the head, the washer and the nut are all neces-
sarily inside the rim considerable trouble is also experienced in consequence of
the edges of the outer cover (when one is fitted) engaging with these parts;
and the object of my invention is 'to overcome these difficulties.
According to my invention the air valve consists of two portions, an inner
portion having a nozzle to which the inflating pump is attached and in which
the valve is placed, and an outer portion which is attached to the rim of the wheel.
The upper part (supposing the valve to be at the top of the wheel) of, each of
these portions is made conical, the larger and open ends of the cones 'being
uppermost and adjacent to the air tube. The valve itself may be fitted in the
conical part of the inner portion.
The arrangement is fixed in position as follows:-A small hole is made,, in
the air tube and 'the conical head of the inner portion is inserted by stretching
the rubber over the conical head; if now the inner portion be pulled away
from the tube, as if to withdraw it, the rubber of the tube will partially stretch
and lie evenly over the conical head. The conical outer portion is now slipped
over and the joint made by screwing up a nut which is threaded on the inner
portion. The rubber of the air tube is gripped between the conical surfaces,
and very little pressure is required, in consequence of the wedge like action,
to make the joint.
The greater portion of the conical parts may protrude through the rim radially
towards the centre of the wheel and thus be altogether out of the way of the
air tube and the edges of the outer covering, which is a point of great importance
when the latter are, as in the Dunlop tyre, continuous, and have to lie.near the
centre of the rim in order that the opposite portions may be levered over...the
edge of the rim. The outer portion of the air valve,may be 'fixed to the rim
by a nut or it may be forced by the air pressure into a conical seating, and .a
suitable cap may be provided to screw on to the nozzle of the inner portion.
Dated the 11t
AT
1
1007
SLOAN & LLOYD BARNES,
Castle Chambers, 26, Castle Street,, Liverpool,
Agents for the Applicant.

page_text: An Improved Method of Fixing Air Valves to Pneumatic Tyres,
Air Tubes for same.
and
I, ISAAC BARTON, formerly of Prenton Water Works, Prenton, Birkenhead,
Cheshire, but now of Doonagore Quarries, near Ennistymon, County Clare,
Ireland, 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
1 and by the following statement:-
This invention relates to the method of fixing air valves to the air tubes of
pneumatic tyres. At present it is usual to form a round head on the air valve
which is inserted through a suitable hole in the air tube, and the joint is made
by gripping the air tube between the said head and a washer by the pressure of
a nut threaded on the screwed part of the air valve. When the joint is made
in this way it is necessary to strengthen the air tube near the joint by means
of a canvas backing and leakage very frequently occurs at this joint which is
very difficult to renair; and as the head, the washer and the nut are all neces-
sarily inside the rim considerable trouble is also experienced in consequence of
the edges of the outer cover (when one is fitted) engaging with these parts;
and the object of my invention is to overcome these difficulties.
I have illustrated the application of my invention in the accompanying draw-
ings, each of which is a transverse section through a pneumatic tyre and rim
enlarged for the sake of greater clearness; in Fig. I the tyre is, by way of
example, of the single-tube type, and in Fig. II it is of the double-tube type.
Similar parts are indicated by the same reference figures in both drawings.
Referring in the first instance to Fig. I-1 is the air tube or tyre, 2 is the
rim and 3 is the valve stem in which the valve proper is secured. No valve
is shown, as the application of my invention is not limited to any particular style
of valve, but the stem 3 is shown adapted to receive a valve of the Woods
type, which is secured in place by a cap nut in the usual way.
"
"
The stem 3 is made conical at its upper end 4, and it is provided with the
ferrule 5 which is similarly coned and is screwed externally at its smaller end
and fitted with a nut 6.
The arrangement is fixed in position as follows:-A small hole is made in
the air tube and the conical head 4 is inserted by stretching the rubber over the
head; the stem 3 is now pulled away from the tube, as if to withdraw it, the
effect being that the rubber stretches locally and lies evenly over the conical
surface. The ferrule 5 is now slipped over and the joint made staunch by
screwing up the nut 7 which is threaded on the stem 3. The rubber of the
air tube is thus gripped between the conical surfaces, and very little pressure
is required, in consequence of the wedge like action, to make the joint. Finally
the arrangement is passed through the hole or conical seating in the rim and
secured by screwing up the nut 6.
The arrangement shown in Fig. II is similar to that described so far as the
main feature is concerned,-that is to say, making the attachment by gripping
the rubber between two conical surfaces. In this arrangement, however, the
ferrule 5 and nut 7 are kept entirely within the rim, and the arrangement is
secured to the rim by screwing up the nut 61 which is similar in function to 6
but is threaded on the stem 3 instead of on the ferrule 5. In some cases the
nut 6, or 6 as the case may be, may be dispensed with and the air pressure
relied upon to keep the arrangement in place in the rim.
It is to be understood that the tyres and rims illustrated are only shown by

page_text: way of example, and that either arrangement may be used in conjunction with
any tyre or rim to which is is conveniently applicable. Where the arrangement
shown in Fig. I is used in conjunction with a double-tube tyre, it occupies com-
paratively little space in the rim and may thus be kept clear of the edges of the
outer covering, which is a point of importance when the latter are, as in the
Dunlop tyre, continuous, and have to lie near the centre of the rim in order
that the opposite portions may be levered over the edge of the rim.
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. The improved method of fixing air valves to pneumatic tyres and air tubes
for same, which consists in forming the valve stem with a conical end and pro-
viding it with a conical ferrule or the like and a nut, the parts being adapted to
grip the material of the tyre or air tube between the said conical surfaces;
substantially as described.
2. In combination with a pneumatic tyre; the valve stem 3 formed with an
enlarged conical end 4; the internally coned ferrule 5; the nut 7 adapted to
compress the material of the tyre or air tube between the conical surfaces of
the stem and the ferrule, and a nut such as 6 or 6¹ to secure the arrangement to the
rim; substantially as described and illustrated.
3. The improved method of fixing air valves to pneumatic tyres and air tubes
for same, substantially as described and illustrated in Fig. I.
4. The improved method of fixing air valves to pneumatic tyres and air tubes
for same, substantially as described and illustrated in Fig. II.
Dated this 12th day of suonat 1000
SLOAN & LLOYD BARNES,
34, Castle Street, Liverpool, Agents for the Applicant.