Improvements in and connected with Valves for Pneumatic Tyres.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in and connected with Valves for Pneumatic Tyres.
I, JOHN MAXFIELD, of No. 326, Liverpool Road, in the County of Middlesex,
Manufacturer, do hereby declare the nature of this invention to be as follows:-.
The valve is made entirely of rubber or other suitable elastic substance or
material. It consists of a nipple provided with a flanged stem to allow of its
being fitted to the tyre in any convenient manner and position.
Such nipple and flanged stem have a continuous central aperture or air passage
formed therein or therethrough one end whereof is closed by means of an elastic
cap or diaphragm that forms the valve piece which prevents the air escaping
from the tyre and which is acted upon in the ordinary way by the inflating pump
and may be of any convenient shape and size, and fitted in any convenient manner.
Or à double valve may be formed by means of a cone or ball, which takes its
seating on or in the head of the nipple, and is held in position by the elastic
cap or diaphragm which serves to prevent the air escaping from the tyre, as
already mentioned.
Suitable perforations are made in such cap or diaphragm to allow the air to pass
into the tyre during the process of inflation. These perforations are hermetically
closed by the pressure of the air in the tyre which forces the cap or diaphragm
tightly against its seating, thus effectually preventing leakage and the consequent
loss of rigidity in the tyre.
I fit the inflator with a small bulb or nozzle, which preferably is of a corre
sponding form to the central aperture or air passage in the nipple, and when it is
desired to inflate the tyre, such bulb or nozzle is pressed into the nipple, instead
of being screwed therein as heretofore, thus facilitating the operation of inflation.
I likewise fit the nipple with a suitable plug of any convenient shape and
size which serves to exclude the dust and other impurities therefrom, and so
prevents the air passage therein becoming choked.
In order to deflate the tyre I provide a small opener consisting of a stem furnished
with a handle and insert such stem into the air passage in the valve thus raising
the valve piece and permitting the air to escape from the tyre.
1007
Date
ELT & Co.,
Registered Patent Agents,
43, Southampton Buildings, Holborn, London, Agents for Applicant.
Improvements in and connected with Valves for Pneumatic||Tyres.
I, John MaxfieLD, of No. 326, Liverpool Road, in the County of Middlesex,
Manufacturer, do hereby declare the nature of this invention and in what manner
Price 8d.1

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
The object of this invention is to greatly simplify the construction of air valves
for pneumatic tyres and to considerably enhance the utility of such valves.
In the accompanying drawings Figure 1 is a plan and Figure 2 a vertical
section, taken on the line A A Figure 1, of one of my improved valves. Figure 3
is an elevation and Figure 4 a plan of the underside of such valve. Figure 5
shews a transverse section of a pneumatic tyre fitted with such valve. Figures 6
and 7 shew alternative forms of nozzle for the inflator. Figure 8 shews one form
of deflator. Figure 9 illustrates one form of double valve. Figure 10 is a
sectional view of the elastic cap. Figures 11 to 15 both inclusive illustrate various
modifications of my invention, and Figure 16 is a transverse section shewing
one method of fitting my invention to the rim and tyre of a wheel.
Similar letters of reference indicate corresponding parts throughout the
drawings.
My improved valve is made entirely of rubber or other suitable elastic substance
or material and consists of a nipple a having a base al furnished with a flange a²,
which base and flange are cemented to the tyre. The nipple is provided with an
air passage consisting of a slit terminating in an aperture wherein the nozzle
of the inflator is fitted when inflating the tyre, and to prevent any leakage of
air from the tyre through such air passage an elastic sleeve or cap is fitted over
the nipple so as to tightly compress the walls of the passage together thus
effectually closing the same, while the pressure of the air within the tyre serves
to make a more perfect seal.
A modification of my invention consists in forming a double valve as shewn
in Figure 9 by means of a ball d or its equivalent which takes its seating on or
in the valve nipple and is held in position by the elastic cap c wherein perforations
are made, (as shewn at Figure 10,) to allow the air to pass into the tyre during
the process of inflation. When the tyre is inflated such perforations are closed
by the pressure of the air in the tyre which forces the cap tightly against its
seating thus effectually preventing leakage and the consequent loss of rigidity
in the tyre.
The inflator is fitted with a small nozzle or bulb,-(see Figures 6, and 7;)-
and when it is desired to inflate the tyre such nozzle or bulb is pressed into the
aperture in the base of the nipple instead of being screwed in as heretofore
thus facilitating the operation of inflation.
If desired the air passage may be fitted with a plug to exclude the dust and dirt
and to prevent its becoming choked-Or in lieu of a plug the hole in the tyre
wherein the valve nipple is fitted may be made of smaller diameter than the base
of the nipple so that when such base is inserted therein the walls of the air passage
are pressed tightly together thus effectually excluding the dust and dirt.
To facilitate the operation of deflation I provide a deflator consisting of a metal
tube, (see Figure 8)-which is inserted in the air passage thus expanding the
same and permitting the air to escape from the tyre."
Figure 11 is a section, Figure 12 an elevation, and Figure 13 a plan of a modi-
fication of my invention wherein the elastic sleeve or cap c is dispensed with.
To effect this the valve is made of a mushroom form and concave at the bottom.
When it is fitted to the tyre B the bottom is expanded and straightened out as
shewn at Figure 12, thus closing the air passage in the valve and preventing
leakage, without the aid of the elastic sleeve or cap.
Figure 14 shews a further modification of my invention wherein the head of the
valve and likewise the elastic cap are fastened directly to the tyre. In this modi-
fication the flange a² on the valve nipple and the perforations in the elastic cap
are dispensed with while the latter is provided with a tail piece c' which is cemented
to the tyre as shewn. In this form when inflating the tyre the elastic cap c
acts as a non-return valve piece.

page_text: Figure 15 illustrates a further modification in the form of the valve nipple
which is of an oblique rectangular shape and is furnished with a cap of corre-
sponding form which is cemented thereto at e*.
ADVANTAGES.
The advantages of my invention may be thus summarised-Firstly, great sim-
plicity of construction combined with increased facility and efficiency of operation.
Secondly, obviating any necessity for screwing and unscrewing when inflating
and detating the tyre. Thirdly, total immunity from any risk of leakage arising
from the defectiveness of any composite metal and rubber joints, such joints
being entirely dispensed with. Fourthly, fitting an elastic valve directly to
the tyre.
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. In combination with a pneumatic tyre an elastic valve provided with a suitable
air passage which is closed automatically either by compression, or by combined
expansion and compression, all substantially as described.
2. In combination with a pneumatic tyre an elastic valve provided with an air
passage whereto an inflator or deflator can be fitted without the operations of
screwing and unscrewing all substantially as described.
3. In combination with a pneumatic tyre an elastic double valve made substan-
tially in the manner herein before described.
4. Fitting an elastic valve made substantially in accordance with my invention,
or with any of its various modifications, directly to a pneumatic tyre.
5. In combination with a pneumatic tyre the mushroom form of elastic valve
made and fitted all substantially as described and shewn.
6. In combination with a pneumatic tyre an elastic valve, either furnished or
not furnished with an elastic sleeve or cap fitted either in the tyre only, or in
the tyre and wheel rim all substantially as described.
·ת
1011
Suomest 1808
VILAW
ELT & Co.,
Registered Patent Agents,
43, Southampton Buildings, London, W.C., Agents for Applicant.