Improvements in Valves for Pneumatic Tyres, Inflators and the like.
Year: 1899

page_text: Date of Application, 27th Jan., 1899
PROVISIONAL SPECIFICATION.
Improvements in Valves for Pneumatic Tyres, Inflators and the like.
I, ISAAC BARTON, of Prenton Water Works, Prenton, Birkenhead, in the County
of Chester, Engineer, do hereby declare the nature of this invention to be as
follows:-
to
This invention relates primarily to valves for pneumatic tyres and the like,
but is also applicable to valves for inflators used in connection with such tyres,
and the objects of the invention are
provide a valve requiring
the case of valves of
less pressure to open it than is required in
this type now in use, and to So
construct the valve that the rubber
part thereof has for a seating a non-metallic substance such as glass or porcelain
between which and the rubber there is no chemical action, and to which, there-
fore, the rubber does not adhere..
The valve fitting, as applied to a pneumatic tyre, comprises a screwed metallic
nipple projecting through the rim of the wheel and communicating with the
interior of the air tube of the tyre, and a central hollow stem provided with a
collar which makes joint through a washer with the nose of the nipple and which
is secured thereto by means of a flanged nut; on the one side of the flange the
stem projects into the nipple, and on the other side of the flange the stem is
screwed to form an attachment for the inflator nozzle. A short length of rubber
tube of small diameter encircles the portion of the stem within the nipple, a
portion of the tube projecting beyond the stem, within which portion I place a
ball of glass, porcelain or the like; the ball is larger in diameter than the normal
bore of the tube, so that the latter is stretched over the ball. When air is pumped
into the tyre the tube stretches in consequence of the internal pressure due to
pumping so that the air passes between the inner wall of the tube and the ball;
when the pressure due to the pump is removed the elastic force of the tube,
assisted by the pressure of the air in the tyre which is exerted on the outside of
the tube, closes the passage way and thus prevents any outward flow of air through
the valve.
Lugs or nibs are provided on the inside of the nipple to prevent the ball being
forced out of the open end of the rubber tube as the tyre is being pumped up;
the same object may be effected by either loosely or rigidly attaching the ball to
the stem, or by providing a central abutment, carried from the nipple, which
enters the open end of the rubber tube and limits the movement of the ball.
The stem may be grooved circumferentially where it is encircled by the tube so
as to have a better grip of the latter.
I find that the pressure required to open a valve constructed as described, and
to force the air past it, is considerably less than is required in valves of this type
as at present constructed, and that as the rubber has no action on the material of
the ball there is no tendency for it to adhere thereto.

page_text: The construction of the valve proper, when applied to inflators, is substantially
sanilar to that described.
Dated this 26th day of January 1899.
SLOAN & LLOYD BARNES,
Chartered Patent Agents, 34, Castle Street, Liverpool.
improvements in valves for Pneumatic Tyres, Inflators and the like.
I, ISAAC BARTON, of Prenton Water Works, Prenton, Birkenhead, in the County
of Chester, Engineer, 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 relates primarily to valves for pneumatic tyres and the like,
but it is also applicable to valves for inflators used in connection with such tyres,
and
the objects of the invention are to provide a valve requiring
less pressure to open it than
is required in the case of valves of
this type now in use, and to SO construct the valve that the rubber
part thereof has for a seating a non-metallic substance such as glass or porcelain
between which and the rubber there is no chemical action, and to which, there-
fore, the rubber does not adhere.
I have illustrated my invention in the accompanying drawings, in which Fig. I
is a view of the valve, in medial section, as applied to a pneumatic tyre, and
Fig. II is a plan view showing the mode of carrying the abutment 10.
The valve fitting, as applied to a pneumatic tyre, comprises a screwed metallic
nipple 1 projecting through the rim 2 of the wheel and communicating
with the interior of the air tube 3 of the tyre, and a central hollow stem 4 pro-
vided with a collar 5 which makes joint through a washer 6 with the nose of the
nipple 1 and which is secured thereto by means of a flanged nut on the one
side of the flange the stem 4 projects into the nipple 1, and on the other side the
stem is screwed to form an attachment for the inflator nozzle. A short length of
rubber tube 8 of small diameter encircles the portion of the stem 4 within the
nipple, a portion of the tube projecting beyond the stem, within which portion I
place a ball 9 of glass, porcelain or the like; the ball is larger in diameter than
the normal bore of the tube, so that the latter is stretched over the ball. When
air is pumped into the air tube 3 of the tyre, the tube S stretches in consequence
of the internal pressure due to pumping so that the air passes between the inner
wall of the tube 8 and the ball 9; when the pressure due to the pump is removed,
the elastic force of the tube 8, assisted by the pressure of the air in the air tube of
the tyre which is exerted on the outside of the tube S, closes the passage way and
thus prevents any outward flow of air through the valve.
The glass ball is prevented from being forced out of the tube 8 by a central
abutment 10, depending from the radial arms 11 which, as will be seen from the
plan, support the abutment without materially interfering with the flow of air.
In some cases lugs or nibs may be provided inside the nipple 1 to keep the
ball 9 in position, or the ball may be loosely or rigidly attached to the stem 4;
but usually the arrangement shown in the drawings is preferable.
I have illustrated the valve in conjunction with a special method of fixing
described in the Specification to Letters Patent granted to me, numbered 26503
and dated November 13th, 1897, but it is to be understood that it is applicable to
valves with other methods of fixing than that shown.

page_text: The stem 4 may be grooved circumferentially where it is encircled by the tube
so as to have a better grip of the latter, but usually this is not necessary.
I find that the pressure required to open a valve constructed as described, and
to force the air past it, is considerably less than is required in valves of this type
as at present constructed, and that as the rubber has no action on the material
of the ball there is no tendency for it to adhere thereto.
In some cases I make the abutment 10 detachable from the nipple 1 so that it
may be withdrawn with the stem 4; this facilitates the introduction of the end
of the abutment into the rubber tube as with this construction this may be done
before the stem is inserted in the nipple 1; when the arrangement is modified in
this way the stem 4 with the tube, ball and abutment in position are together
introduced into the nipple 1 and the three radial arms 11 then come into contact
with a shoulder formed in the bore of the nipple and so locate the abutment.
The construction of the valve proper, when applied to inflators, is substantially
similar to that described.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:―
1. The improved valve for pneumatic tyres, inflators and the like, which con-
sists of, a hollow stem over which a rubber tube is stretched, a ball (preferably
non-metallic) of greater diameter than the bore of the tube, placed within the
latter, and means for preventing the ball being forced out of the tube; substan-
tially as described and illustrated.
2. In a valve for pneumatic tyres, inflators and the like, in combination:-a
hollow stem, a rubber tube stretched thereon, a ball placed in the said tube, and
a depending abutment which limits the outward movement of the ball; substan-
tially as described and illustrated.
3. In a valve for pneumatic tyres, inflators and the like, in combination :-a
hollow stem, a rubber tube stretched thereon, a ball placed in the tube, a screwed
nipple (which in the case of a tyre valve is attached to the air tube) with which
the stem makes joint and to which is attached the means for preventing the ball
being forced out of the tube; substantially as described and illustrated.
4. The improved valve; substantially as illustrated in the drawings.
Dated this 26th day of October 1899.
SLOAN & LLOYD BARNES,
Chartered Patent Agents, 34, Castle Street, Liverpool.