Improvements in or applicable to Valves for Inflating Pneumatic Tyres, and in the Means for Inserting and Fixing the same in such Tyres.
Year: 1892

page_text: Date of Application, 2nd Sept., 1892
Complete Specification Left, 2nd May, 1893-Accepted, 2nd June, 1893
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Valves for Inflating Pneumatic
Tyres, and in the Means for Inserting and Fixing the same in
such Tyres.
I HARRY HERBERT WADDINGTON of Spring Bank Mills Hyde in the
County of Chester India Rubber Manufacturer, do hereby declare the nature of
this invention to be as follows:-
Hitherto the valve tubes for the inflation of pneumatic tyres have usually been
made with a flange at or near one end, and a screw thread above this flange upon
which a nut is fixed.
This flanged head has been forced through a hole or opening in the tyre, the
said opening being stretched or expanded for the passage of the flange, and
contracting again afterwards to fit round the screwed neck of the valve tube upon
which the nut is then turned, and tightened upon the outside of the tyre or rim to
fix the valve tube in place.
This hole or opening in the tyre must be sufficiently large to admit of the
insertion of the flanged end of the valve tube therein when expanded and it is
sometimes further enlarged by the pressure of the nut above named until there is a
slight leakage round the neck of the valve tube and the object of my invention
is to provide simple and efficient means for obviating this defect.
According to my invention, instead of casting or fixing the internal flange above
described upon the end of the neck of the valve tube, I take an oval or other piece
or disc of brass or other suitable metal, in the centre of which is bored a hole
tapped with a screw thread.
This piece or disc (which is virtually a metal nut) I place inside the tube of
rubber which is to form the tyre before the latter is joined endless and vulcanized,
the central hole of the said disc or nut being opposite to a small corresponding hole
in the said rubber tube, and I fix the metal disc in this position by means of a
cemented patch, or by embedding it in the surface of the tube or otherwise so that
it is held firmly in its place and cemented perfectly air tight.
The hole is then filled in or plugged with rubber of a contrasting color, in order
to mark the position of the central hole in the metal disc or nut, and the tube is then
formed into a circular tyre and vulcanized in the usual way with the metal disc or
nut in place, after which the hole is again opened out by the removal of the india
rubber plug.
The valve or inflating tube is made of metal with a flange of suitable size at a
convenient distance from its end, and the latter is made of such a diameter and
provided with a thread externally so that it can be passed through the hole in the
rubber tube or tyre and screwed into the central hole in the metal disc or nut above
described and thus it can readily be attached to or detached from the tyre.
The inflating tube is fitted with a suitable back pressure valve and a deflating
valve and also with a screwed nozzle for attaching the inflator, and a removable
screwed cap for covering the same.
Dated this 1st day of September 1892.

page_text: COMPLETE SPECIFICATION.
Improvements in or applicable to Valves for Inflating Pneumatic
Tyres, and .in. the Means for Inserting and Fixing the same in
such Tyres.
I HARRY HERBERT WADDINGTON of Spring Bank Mills Hyde in the
County of Chester, India Rubber Manufacturer, 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:-
Hitherto valves, for the inflation of pneumatic tyres have usually been made
with a flange at or near one end and a screw thread above this flange upon which a
nut is fixed.
This flanged end has been forced through a hole or opening in the tyre, the said
opening being stretched or expanded for the passage of the flange and contracting
again afterwards to fit round the screwed neck of the valve upon which the nut is
then turned and tightened upon the outside of the tyre to fix the valve in place.
This hole or opening in the tyre must be sufficiently large to admit of the
insertion of the flanged end of the valve and it is sometimes further enlarged by
the pressure of the nut above named until there is a slight leakage round the neck
of the valve and the object of my invention is to provide simple and efficient means
for obviating this defect.
The invention will be readily understood on reference to the accompanying sheet
of drawings and the following explanation thereof.
Fig. 1 is a sectional elevation of a portion of a pneumatic tyre with an inflating
valve applied according to my invention and
Fig. 2 is a plan view of the tyre with the valve removed.
Fig. 3 is an elevation of the valve detached.
Fig. 4 shews a modification hereinafter referred to.
In the first place instead of fixing the internal flange above described upon the
end of the neck of the valve, I take an oval or other piece or disc a of brass or
other suitable metal in the centre of which is bored a hole tapped with a screw
thread as seen at Fig. 1. Or the piece a may be provided with a screwed boss a¹
see Fig. 4.
I place this piece a inside the tube of rubber which is to form the tyre (before
the latter is joined endless and vulcanized) with its central hole (in the case shewn
by Fig. 1) opposite to a small corresponding hole b¹ in the said tube see Fig. 2 and
I fix it in position by means of a patch e as shewn or by embedding it in the inner
surface of the tube or otherwise. The hole b' is then filled in with rubber of a
contrasting color in order to mark the position of the central hole in the piece a
and the tube is formed into a circular tyre and vulcanized in the usual way with
the piece a in place. The hole is formed again after vulcanization.
The valve d is made with a flange d' of suitable diameter and a screwed end d²
corresponding with the hole in the piece a or on the boss a' and thus it can readily
be attached to or detached from the tyre.
I prefer to mill or roughen the exterior of the body or casing of the valve d for
convenience in screwing or unscrewing the same, as seen in the detached view
thereof Fig. 3.
The piece a forms a nut or internal flange into or on which the end d² of the
valve fits and thus I am enabled to make this flange of such a size as shown at
Figs. 1 and 2 that leakage will be practically impossible, and as it is always fixed
in placed in the tyre there will be no straining of the hole & when the valve is
inserted.
I also prefer to make the valve inlet d³ with a plain flat end to screw down upon
a leather faced shoulder or seating in the casing d as shewn on Fig. 1, and I also

page_text: provide the said part d with a milled flange d' and a screwed cap or cover & see
Fig. 3.
The inflator may be provided with a back pressure valve or an additional back
pressure valve may be provided in the barrel das seen at de Fig. 4.
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. The improved means for inserting and fixing valves in pneumatic tyres
substantially as hereinbefore described and illustrated by the annexed drawings.
2. The combination with the inlet valve d³ having a Hat end and screwing into
the casing which is made with a leather faced internal shoulder, of the flange d'
and screwed end d³, substantially as herein before described and illustrated by the
annexed drawings.
Dated this 1st day of May 1802
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.