A New or Improved Air Valve for Pneumatic Tyres and for other analogous purposes.
Year: 1891

page_text: Date of Application, 13th Oct., 1891
Complete Specification Left, 15th Aug., 1892-Accepted, 13th Oct., 1892
PROVISIONAL SPECIFICATION.
A New or Improved Air Valve for Pneumatic Tyres and for other
analogous purposes.
I ALFRED ADDISON BLANDY M.D. of 58 Brook Street Grosvenor Square
London in the County of Middlesex do hereby declare the nature of this invention
to be as follows:-
This invention relates to compressed air valves used in pneumatic tyres for vehicles
such as bicycles tricycles et cetera or other tubes carrying compressed air and for
analogous purposes.
My present invention is as follows :—
A short tube of suitable material such as brass or ebonite and of suitable length
has the outer or valve end of a cone shape and having an air aperture of of an
inch or thereabouts. Within this end is secured a cone shaped valve made of soft
vulcanized rubber, gutta percha or imitations thereof or of other suitable material
this cone shaped valve terminates with a sharp point its base being about 1 of an
inch and its length a little greater than its width of base.
A screw pin passes through the aforesaid tube to keep the valve in position.
The aforesaid (metal or ebonite et cetera) tube must have a rim upon the end
which enters the air tube-this metal rim or washer is recessed and holds a washer
of rubber or the like or other suitable material which tightly grasps the tube and
rests upon the aforesaid metal washer.
A second similar ductile washer larger than the first has a flexible tube attached
which latter is forced over the metal et cetera tube and holds the tube the two washers
being cemented together.
The tubes thus immovably secured are passed a few inches inside of the air tube
of the tyre and forced through a small hole until the washers are brought in contact
with the upper surface of air tube and securely cemented there.
The valve end of the metal et cetera tube now projects a suitable distance outside
and another rubber or soft washer is passed over and securely fastened to the tube
and to the tyre making an inseparable union of the washers tube and tyre all together
perfectly air tight.
My present invention will therefore be found to provide a valve for the purposes
specified, self adapting, self supporting, tight, tough, independent of temperature
or moisture, and wear and tear, and may be made of soft vulcanized substance or
other materials or imitations of rubber such as the compounds invented and patented
by me.
To adapt this valve according to my present invention to other valves now in use
the stem of the tube must be elongated from the washer downwards and this is
forced into the rubber tube holding the stem of the old valve which is to be replaced
by my new valve.
Dah 10th 15
1001

page_text: The loose metal washer is then placed on the tube a on the side of m opposite
to b and may have a canvas hose or soft.washer or both or other material inter-
posed between i and m and then the outer covering of the pneumatic tyre comes
next and another soft washer interposed--the nut being finally tightly screwed
upon the thread a to bind the whole together and firmly hold same.
Thus this valve is firmly mounted and secured in, an air tight manner into the
body of the pneumatic tyre but I would here remark that I do not confine myself
to the precise details of mounting as hereinbefore described as my said improved
air valve may be mounted or arranged in any other suitable manner and according
to the construction of the pneumatic tyre to which it is to be applied. Nevertheless
the nut k acting on the external thread on the tube a in conjunction with the fixed
flange ò is of great benefit in the satisfactory mounting and arrangement of my
improved valve. The put k passes through a hole provided for same (in any suitable
manner) in the metal rim or felloe.
To fill the pneumatic air tube through my improved valve the operation is as
follows:-
The outer cap 9 is removed and the air is forced through the passage & in the
inner tube d and thence down the interior of the tube a into the pneumatic tyre
until the latter is sufficiently filled.
Immediately the pressure is removed from the outer end of the tube a the
internal pressure of the pneumatic tyre forces up the valve or conical plug ƒ tightly
into the conical seating e and prevents any escape of the outward pressure from
the tube a.
The outer cap g is then tightly screwed down over the tube a-an air tight
packing being thus also made to offer further resistance against the pressure in the
pneumatic tube.
By forming a square head on the inner tube g (see Figures 4 and 6) same can be
easily adjusted and removed if required from the main tube a by any suitable tool
such as a spanner or pincers.
My said improved valve would of course act equally well with gas or the like in
place of air.
My present invention will be found to provide a valve for the purposes specified
self adapting, self supporting, tight, tough, independent of temperature or moisture
and wear and tear.
To adapt this valve according to my present invention to other valves now in
use the stem of the tube a must be elongated (the washer b being dispensed
with) and this is forced into the rubber tube holding the stem of the old valve
(which is to be replaced by my new valve) and there cemented or secured in any
suitable manner.
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. An air valve for pneumatic tyres for bicycles, tricycles and other analogous
purposes consisting of a main tube internally coned shaped towards its outer
end to form a seating for a cone shaped valve or plug which operates against
said cone shaped seating substantially in the manner and for the purposes herein-
before described.
2. An air valve-for the purposes specified-consisting of a main tube a externally
threaded a flange such as b on the inner end thereof to be inserted into the pneumatic
tyre a cone shaped valve or plug (of rubber or the like material) such as foperating
in a cone shaped recess such as e formed internally in the main tube a and towards
the outer end thereof so that pressure in the tyre will keep the valveƒ tight upon
its seating e and automatically close the valve after filling the tyre and also having
an outer closing cap or final covering such as g substantially in the manner and
for the purposes hereinbefore described and illustrated in the drawings hereunto
annexed.

page_text: 3. The improved arrangement and construction of air valves for the purposes
specified arranged and mounted and acting in combination with a pneumatic tyre
for bicycles tricycles and other analogous purposes substantially in the manner and
for the purposes hereinbefore described and illustrated by way of example in the
drawings hereunto annexed.
Dated this 13th day of July 1899.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.