Valve Devices for Pneumatic Tires.
Year: 1896

page_text: Date of Application, 19th May, 1896-Accepted, 27th June, 1896
COMPLETE SPECIFICATION.
Valve Devices for Pneumatic Tires.
I, ALBERT EDGAR ALEXANDER, of 19, Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare
the nature of this invention (a communication to me from abroad by Fred William
Morgan and Rufus Wright both of 339, West Lake Street, Chicago, Cook County,
Illinois, United States of America, Rubber Manufacturers) and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement :-
Prominent objects of the invention are, to prevent injury to an elastic packing
which forms the seating portion of the valve-to ensure a tight joint between
the valve and valve-seat when the valve is closed; to prevent the packing from
sticking to the valve-seat and becoming disarranged when the valve is opened;
to steady the valve and cause it to work and close perfectly true; and to
provide certain improved details serving to increase the general efficiency of
valve devices for pneumatic tires, and afford a simple and practical construction.
To the attainment of the foregoing and other useful ends, the invention consists
in matters hereinafter set forth.
In the accompanying drawings,-
Figure 1 represents a section taken centrally and longitudinally through a valve
device embodying the invention, the cap or nut for tightening up and locking the
valve being omitted.
Figure 2 is a similar view including the cap or nut and showing the valve
tightened against its seat and locked.
Figure 3 is a section on line - in Fig. 1.
Figure 4 shows the upper end portion of the casing represented in Fig. 1.
Figure 5 shows the valve and certain adjuncts, partly in central longitudinal
section, and partly in elevation.
Figure 6 is a like view showing the sleeve F having an unthreaded bore.
Figure 7 is a sectional plan on line y-y in Fig. 6.
The cylindric shell or casing A is understood to be adapted for insertion within
the tubular flexible nipple of a pneumatic tire, as usual. The valve-chamber 1
within this casing, is suitably closed at one end, for example by a screw plug B
having a bore 2 which provides a passage between the valve-chamber and the
interior of the pneumatic tire. The casing is also adapted to provide a passage or
throat 3 leading from the valve-chamber to a threaded socket 4 which is provided
at said end of the casing.
The threaded socket 4 is adapted to couple with the threaded nozzle of an air-
pump, and the throat 3 provides an air-passage between the valve-chamber and
said socket. The valve C comprises a cylindric cup shaped head 5 having a flat.
bottom, and an elastic packing 6 which is fitted within the cup and arranged below
the open end 7 of the same. The stem D of the valve is threaded and arranged to
extend centrally through the flat bottom of the cup and the elastic washer or
packing. Said valve-stem is also provided at one end with a thin, flat disk 8
which fits against the underside of the said flat bottom 9 of the cup, or cup-shaped
head 5.
The inner end portion of the throat 3 is formed by a neck 10, which extends
back from the internally thickened portion 11 of the casing and projects within
the valve-chamber. When the valve is in position to close the throat, the said

page_text: neck is received within the open end of the cup so as to engage the packing as in
Fig. 1, and when the valve is tightened up against the seat formed by the annular
end of the neck, said seat or end of the neck will press into the elastic packing, as
in Fig. 2. By thus employing one end of the neck as a seat for the valve, a tight
joint can be provided when the valve is closed, and at the same time, the packing
will not stick to the seat during the act of opening the valve.
It will also be noted that by arranging the face of the elastic packing below the
end 7 of the cup so as to leave an annular spare within the latter, the packing
cannot be forced or crowded over the edge of the end 7 of the cup when the valve
is tightened up, it being understood that in valves where the packing is allowed to
thus spread over such edge, it becomes cut or ruptured. By the arrangement
herein shown however, any portion of the parking which may bulge up when the
valve is closed, will simply fill a portion of the space around the neck, as in Fig. 2.
The nut or cap E is provided with a washer 12, and is constructed with a stem 13
having a threaded socket 14 for engaging the threaded end of the valve-stem, by
which arrangement, the valve can be tightened against the seat by properly turning
the nut or cap. The nut or cap is used alternately with the air-pump, that is to
say, after the tire has been inflated, the air-pump is disconnected from the threaded
socket 4 and the cap is then applied as in Fig. 2, so that by turning the cap, the
valve can be tightened upon the seat, and be locked in such condition by the cap
which also closes the outer end of the casing and excludes dust and moisture from
the interior of the casing.
The threaded valve stem is also provided with a portion which is externally
polygonal in cross-section, and while a polygonal portion could for the broader
purposes of the invention be formed by properly shaping a portion of the stem, it is
preferable as a matter of further improvement to form the same by a sleeve F which
is arranged upon the stem. The throat 3, provides a guide-way for this polygonal
portion or sleeve F and thereby steadies the valve, and by reason of the conforma-
tion of said sleeve, suitable air-passages are left between the same and the cylindric
wall of the throat. The sleeve is preferably formed with a threaded bore, and in
such case it is screwed down upon the threaded stem as in Fig. 5. By such
arrangement, the sleeve provides a nut which can be tightened down upon the
elastic packing so as to maintain the latter in place during use, and at the same
time, the said sleeve maintains the longitudinal axis of the valve in exact coincidence
with a line passing centrally and longitudinally through the throat. The valve
will therefore be held against tilt or wobble, and will always work true, thereby
avoiding a difficulty common to valves for pneumatic tires. As another arrange-
ment the bore of the sleeve can be untbreaded, as in Fig. 6, and in such case, one
end of the sleeve can be turned in as at 15 so as to engage in a groove 16 in the
valve stem.
The spring G is arranged between the valve and the end plug B, and said spring
can be simply interposed between such two members without need of a centering
projection on the valve extending within the coiled spring, since it will not inclose
and be in frictional contact with any projection from the valve.
The stem D is shown threaded along its entire length but if preferred it can be
threaded along its upper portion when the construction shown in Fig. 6 is adopted.
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 :-
1. A valve device for pneumatic tires comprising a casing containing a valve-
chamber and a throat leading from the same, a valve arranged within the valve-
chamber and constructed with a cup, an elastic packing fitted within the cup, and
a stem extending through the elastic packing and provided with a polygonal portion
formed by a sleeve which is held upon the stem and arranged to fit within and work
through the throat, and a spring acting to normally close the valve, substantially
as described.

page_text: 2. A valve device for pneumatic tires, comprising a casing containing a valve
chamber and a throat leading from one end of the same, a valve arranged within the
valve chamber and provided with a threaded stem and an elastic packing, and an
externally polygonal sleeve which is internally threaded and screwed upon the
valve-stem, substantially as and for the purpose set forth.
3. A valve device for pneumatic tires, comprising the shell A containing a valve-
chamber 1 and a throat 3 leading therefrom, a valve arranged within the valve-
chamber and constructed with a cup 5 containing an elastic packing, a screw threaded
stem having a disk 8 fitted against the cup, and a sleeve F secured upon the stem
and arranged to work within the throat, and a spring arranged to normally close
the valve, substantially as described.
4. A valve device for pneumatic tires, comprising a shell containing a valve-
chamber and a throat leading therefrom and having one of its end portions formed
by a neck 10, a valve C arranged within the valve chamber and constructed with a
cup, an elastic packing fitted within the cup, and a stem, and a sleeve F secured
upon the valve stem and arranged to work through the throat, substantially as
described.
5. A valve device for pneumatic tires, comprising the shell or casing constructed
with an internally arranged valve-chamber; a neck forming a valve-seat at one
end of such chamber, and a throat leading from the valve-chamber and extending
centrally through the neck which forms the valve-seat; a valve arranged within
the valve-chamber and comprising a cup containing an elastic packing arranged
with its face below the rim of the cup so as to provide space wherein the neck which
forms the seat is received when the valve is closed; a spring arranged within the
valve-chamber and tending to seat the valve; and a valve-stem extending from
the bottom of the cup centrally through the elastic packing and having a polygonal
portion which works within the throat and engages the wall of the same, substantially
as described.
1000
E. P. ALEXANDER & SON,
Chartered Patent Agents,
19, Southampton Buildings, Chancery Lane, London, W.C., Agents.