An Improved Construction of Valve for Pneumatio Tyres and other Inflatable Articles.
Year: 1896

page_text: COMPLETE SPECIFICATION.
An Improved Construction of Valve for Pneumatio Tyres and
other Inflatable Articles.
I JOHN COLLBRAN of 151 Regent Street in the County of London, Jeweller,
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:-
This invention relates to that class of valve for inflating articles constructed
with a tube through which passes a stem carrying at its lower end a disc which
forms the valve proper; the great objection to this class of valve, as heretofore
constructed, is that it is liable to become inefficient on account of any dust or
grit that may enter the valve; lodging in the mechanism and thus causing a
leakage.
According to this invention I construct an inflating valve with a clear passage",
right through the valve from the air inlet or inlets to the air chamber which
is to bo inflated, when such valve is open. Thus in the event of auy dust or
grit entering the valve, it is blown out by the action of the pump, thereby entirely
obviating the above defect.
And in order that my said invention may be understood will now proceed to
describe the same with reference to the drawing accompanying this specification
in which
Fig. 1 shews section of my improved valve, fitted to the air chamber of a
pneumatic tyre for example, (closed) Fig. 2 section of same (open).
Fig. 8 a modification herenfter referred to.
The same letters denote the same parts in all the views.
a shows a tube sufficiently long to pass into the air chamber, & a square rod or
stein passing through the tube a and provided at its lower end within the air
chamber, with a valve c. d is a nut screwing on to the other end of the rod or
stem b. e is a flange formed on the rod or stem b to prevent the lock nut d from
being screwed right off the rod or stem b. shews a clear passage for the air
to pass through, into the air chamber when the valve is open. is the dust cap,
screwing on to the tube a, h the material of which the air chamber is composed,
tightly clamped between the flauge i and piece k, by means of the nut i, n shows a
nut for securing the tube a to the rim m of the wheel.
In order to open the valve c, the dust cap 9 is first removed, and the out d
unscrewed so that, if the tyre is deflated, the valve and out will occupy the
positions shewn at Fig. 2, the rod or stem will not turn on account of its fitting
into a square hole formed in the upper part of the tubo above the air inlets.
The nozzle of the inflating pump may then be screwed on to the tube a in place
of the dust cap, and it will be seen on reference to the drawing that there is a
clear passage for air or any dust or grit, that may have ontered the valve, to
pass out. During each return stroke of the pump plunger, the valve o will be
closed in consequence of the pressure of air from within the air chamber. When
the air chamber is sufficiently charged, the nozzle of the pump is unscrewed from
the tube a and the lock nut d is screwed down to the position shewn at Fig. 1, in
order to lock the valve in its closed position.
With reference to Fig. 3 it will be seen that the tube a is formed with a number

page_text: of grooves on its outer surface so that it may be inserted in an elastic tube and the
two secured together by means of wiro or the like.
Although 1 have described the stem or red as square in cross section, to
prevent rotation, it may be made of any other form, or other suitable means may
be employed above the air inlets to effect the same object.
By constructing valves according to this invention, they can be made very light
and small and will be found very suitable for such articles as footballs.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be perforined, I declare that what I
claim is:-
1. The improved construction of valve for inflating tyres and other inflatable
articles substantially as set forth.
2. In valves for inflating tyres and other inflatable articles, the guide for the
stem or rod of the valve, formed or fixed above the air inlet or inlets for the
purpose set forth.
3. In valves such as those described for inflating tyres and other inflatable
articles, means for preventing the locking nut from being screwed entirely off the
rod or stem.
Dated this Nineteenth day of November 1900
BROWNE & Co.,
9 Warwick Court, Gray's Inn, London, W.C.,
Agents for the Applicant.