An Improved Valve for Pneumatic Tyres.
Year: 1897

page_text: Date of Application, 13th May, 1897-Accepted, 19th June, 1897
An Improved Valve for Pneumatic Tyres.
I, CARL FRIEDRICH NYSTRÖM of 81 Steindamm, Hamburg in the Empire of
Germany, Merchant, 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 has for its object a valve for pneumatic tyres of bicycles and the
like, by means of which, in consequence of a flat spring compressing a valve tube and
a special fastening head or cap, a double and secure joint is obtained against the
escape of the air contained in the pneumatic tyre, while the handling of the valve
when inflating the tyre may be effected very simply and conveniently.
The object of the invention is shown in the accompanying drawings on an enlarged
scale;
Figure 1 being a vertical cross section of this improved valve in combination with a
pneumatic tyre;
Figure 2 an elevation of the valve head or cap;
Figure 3 a vertical cross section of the valve with the pump pipe fitted thereon
when air is being pumped through the latter into the tyre.
The pneumatic tyre valve consists essentially of a nozzle or pipe e provided with
a thread a and a cover disc b, said pipe serving to receive the valve tube d which is
flanged at its ends. A flat spring fis arranged in a slot e in this pipe and fixed at
its upper end g in a suitable manner in such a way that the said spring with its
lower end, which is provided with a projection h, presses the side of the valve tube d
firmly against the opposite side. The spring may be pressed back with the finger
by means of the projection . The fastening of the nozzle or pipe c on the pneumatic
tyre or air tube i takes place in the ordinary manner by means of a fastening nut k
The pipe c connected in this manner with the air tube is passed through the outer
cover and the rim of the wheel m and drawn tight by means of a nut n so that it
is firmly held.
A further essential constituent of the pneumatic valve is formed by the capo,
which at its upper closed end is provided with an elastic insertion p consisting of
cork, indiarubber or the like. The fastening of this cap on the nozzle or pipe does
not take place, as was hitherto the case, by means of screwing which is inconvenient
and always requires a certain time, but by means of a simple bayonet joint. For this
object the pipe is provided with a pin or study over which a vertical slit r in the cap
is first placed, the cap being then turned until the stud engaging in a spirally threaded
slits finds a firm seat in a recess formed in the end thereof. The cap or rather
its elastic insertion p is so firmly pressed on the upper flanged or bent round part of
the valve pipe that a second absolutely tight joint is formed, if we regard the joint
formed by the flat spring f as the first. On taking off the fastening cap it is
necessary to proceed in a reverse manner by turning so far that the vertical slit r can
slide over the stud The same construction as is indicated for the fastening cap is
also employed for the mouth piece t of the air pump tube u, which for the purpose
of inflating the tyre i takes the place of the fastening cap. The knob or spherical
projection of the same which serves for fastening the tube as well as the elastic
insertion p are here perforated longitudinally in order that the air pumped in by
means of the air pump into the air tube i may pass through them. The air forced
through compresses, as shown in Figure 3, the flat spring f and forces the side of

page_text: the valve tube deto-one side, whilst the air can conveniently enter the air pipe i.
After the tyre is inflated the flat spring presses the side of the valve tube again
firmly to the opposite side so that the air in the interior of the air tube i can no
longer escape. If the mouth piece be again removed and the fastening cap fitted on,
a second joint thus produced by the latter in the manner hereinbefore described.
From the above it appears that by the construction of this valve a double and very
secure joint is obtained against the escape of the air contained in the air tube, whilst
the handling of the same when inflating the tube is very simple and convenient.
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 for pneumatic tyres of bicycles, characterised by the valve tube. (d)
contained in the interior of the nozzle or pipe (c) being compressed by means of a
flat spring (f) to form a joint, said spring being arranged in a slot (e) formed in said
nozzle and adapted on the pumping in of air to be forced away from the valve tube
substantially as set forth.
2. In a valve for a pneumatic tyre such as described, a fastening cap (o) and a
mouth piece (t) each provided with an elastic insertion of cork, indiarubber or the
like (p or p) and a bayonet joint (yrs) adapted to produce a thorough tight joint
for the valve on being pushed or turned over the valve pipe (c) and spring (f),
-substantially as described.
DL: 1941
1000