Improvements in Valves for Pneumatic Tyres.
Year: 1897

page_text: Improvements in Valves for Pneumatic Tyres.
I, JOHN TOWNSEND TRENCH, of Lansdowne Lodge, Kenmare, co. Kerry,
Ireland, Land Agent, do hereby declare the nature of this invention to be as
follows: :-
This invention relates to an improved construction of valve for pneumatic tyres
which is particularly adapted for use with tyres of the "tubeless type in which
but a small amount of lateral space is available.
According to my invention I make the hollow stem adapted to contain the valve
proper which may be of any suitable type with a flat or approximately flat head
preferably of greater length than width. The stem is made of two diameters the
smaller being nearest to the head and the larger being provided with a screw
thread to receive a nut by which it is clamped to the base of the tyre. The hole
in the base of the tyre is made of a diameter slightly smaller than the smaller
diameter of the stem and the said stem is got into position by having the base of
the tyre sprung over its enlarged part.
On the head of the stem is formed a short extension over which is passed a
rubber washer large enough to cover the head of the stem and to be cemented to
the inside of the tyre beyond it. This washer has a short sleeve which fits around
the extension of the stem and is securely fixed thereto by being bound round with
a thread of wire or other suitable material.
As a further safeguard against leakage at this joint I sometimes use a second
rubber washer having a very small hole in it. This washer is stretched to pass
the hole over the end of the extension of the stem which is flanged or recessed to
receive it, the said washer being cemented to the first washer.
As a modification a coned projection may be formed on the inner surface of the
base of the tyre for the stem of the valve to pass through, the head of the said
stem being made of a female cone shape to adapt it to engage with the projection
on the tyre. A similar projection may also be formed on the exterior of the base
of the tyre and a suitable shaped washer be used under the nut.

page_text: Improvements in Valves for Pneumatic Tyres.
I, JOHN TOWNSEND TRENCH, of Lansdowne Lodge, Kenmare, co. Kerry,
Land Agent, 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 to an improved construction of valve for pneumatic
tyres which is particularly adapted for use with tyres of the "tubeless" type in
which but a small amount of lateral space is available.
In the accompanying drawing which illustrates this invention :-
'
Figures 1 and 2 are views in sectional elevation and plan respectively show-
ing one form this invention may assume: Figures 3 and 4 are similar views show-
ing a modification, and Figures 5, 6 and 7 are broken views in sectional elevation
showing other forms the invention may assume.
The
Throughout the views similar parts are marked with like letters of reference.
The hollow stem A of the valve-which is fitted with any suitable type of valve
and is provided with the usual inflating nozzle" and cap is provided with a
a flat or
approximately flat head a of greater length than width. This head may be either flat as
shown in Figure 1 or concave or mushroom shaped as shown in Figure 2. The
stem A is made of two diameters the smaller part al carrying the lead a.
other part of the stem A. i.e., that of the larger diameter is threaded to receive
a nut B by which it is clamped to the base ✗ of the tyre. The hole in the base
of the tyre is made of a diameter slightly smaller than the diameter of the part a¹
of the stem A so that it grips the said part of the stem tightly. The stem, is
inserted into the hole in the base of the tyre by expanding the hole therein to
allow the larger part of the stem A to be passed through it.
On the end of the stem A exterior to the head a is formed a short extension a²
over which is passed a flanged rubber washer or collar C which is fixed round the
said extension by being bound round with a thread of wire or other suitable
material and is fixed to the base of the tyre beyond the edge of the head of the
stem by rubber solution or other suitable cement.
As a further safeguard against leakage at this point I sometimes use a second
rubber washer or collar D which is stretched over the orifice of the extension a²
of the stem A and is cemented to the washer or collar C and to the base of the
tyre beyond the edges of the said washer or collar. The washer or collar D) is
perforated with a small hole d after it is in place.
As a modification a small hole may be punched or cut out of the washer C
adapting it to be sprung on to the extension a² of the stem as shown, by Figure 2.
As an alternative construction the head a may be threaded on to the part a
of the stem A in which case the nut B is dispensed with and a fixed plate B3! pro-
vided in its place as shown by Figure 5.
.'
As a further modification a cone-shaped projection may be moulded or formed
on the inner surface of the base X of the tyre for the stem A of the valve to pass
through, the underside of the head a of the said stem being provided with a cone
.shaped recess to fit over and engage with the said projection as shown by Figure 6.
Figure 7 shows a modification of this arrangement in which the head a is screwed
on to the part a² of the stem A and the nut B is replaced by a fixed plate B¹.
If desired a cone-shaped projection may also be formed on the exterior surface
of the base X of 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) The improved method of attaching the stems of valves
to
nneumatio

page_text: tyres substantially as herein specified and illustrated by the accompanying
drawing.
(2) In a valve for pneumatic tyres, a hollow stem adapted to carry the valve,
that part adapted to pass through the tyre being of a smaller diameter than the
other part and carrying a head of greater length than width which is adapted to
lie within the tyre and to be drawn up into contact therewith by means of a nut
threaded on to its larger part and bearing against the outside of the tyre, as set
forth.
(3) In a valve for pneumatic tyres, a hollow stem adapted to carry the valve,
the said stem being of two diameters and having a head of greater length than
width at its smaller end and an extension beyond the said head adapted to receive
a rubber washer or collar to seal the junction of the stem with the tyre, as and
for the purpose set forth.
(4) In a valve for pneumatic tyres, a hollow stem adapted to carry a valve
that part of the stem adapted to pass through the tyre being of a smaller diameter
than the other part, of a plate of greater length than width fixed to or carried by
the stem at the junction of the part of smaller diameter with the part of larger
diameter, and of a shaped nut threaded on the part of smaller diameter as
set forth.
(5) In a valve for pneumatic tyres, a hollow stem adapted to carry a valve, that
part of the stem adapted to pass through the tyre being of a smaller diameter
than the other part, of a plate of greater length than width fixed to or carried by
the stem at the junction of the part of smaller diameter with the part of larger
diameter, of a shaped nut threaded on the part of smaller diameter, and of a rubber
washer or collar adapted to be fixed round the end of the smaller part of the stem
and to be solutioned or otherwise fixed to the tyre so as to cover the shaped nut,
as and for the purpose set forth.
(6) In combination, a valve stem such as A of two diameters the smaller part a¹
being adapted to pass through the tyre and having at or near its end a head such
as a, of a shaped nut such as B threaded on the larger part of the stem, and of
a washer or collar such as C fixed round the end of the smaller part a¹ of the stem
exterior to the head a and adapted to be fixed to the tyre so as to entirely cover
and enclose the said head, as and for the purpose set forth.
(7) In combination, a valve stem such as A of two diameters the smaller part a¹
being adapted to pass through the tyre and having at or near its end a head such
as a, of a shaped nut such as B threaded on the larger part of the stem, of a
washer or collar such as C fixed round the end of the smaller part a¹ of the stem
exterior to the head a and adapted to be fixed to the tyre so as to entirely cover
and enclose the said head, and of a second washer or collar such as D adapted to
be stretched over the orifice of the stem A and to be fixed to the washer or collar C
and to the tyre beyond the edges of the said washer or collar, the said second
washer or collar D being perforated with a small hole, as and for the purpose
set forth.
(8) In combination a valve stem such as A of two diameters, the smaller being
adapted to pass through the tyre, of a plate such as B' fixed to or carried by the
stem A at the junction of the part of smaller diameter with that of larger diameter,
of a nut such as a threaded on to the smaller part of the stem A so as to form a
head thereto, and of a washer or collar such as C fixed round the end of the
smaller part a¹ of the stem exterior to the head a and adapted to be fixed to the
tyre so as to entirely cover and enclose the said head, as and for the purpose set
forth.
(9) In combination a valve stem such as A of two diameters, the smaller being
adapted to pass through the tyre of a plate such as B¹ fixed to or carried by the
stem A at the junction of the part of smaller diameter with that of larger diameter,
of a nut such as a threaded on to the smaller part of the stem A so as to form a head
thereto, of a washer or collar such as C fixed round the end of the smaller part a¹
of the stem exterior to the head a and adapted to be fixed to the tyre so as to

page_text: entirely cover and enclose the said head, and of a second washer or collar such as D
adapted to be stretched over the orifice of the stem A and to be fixed to the washer
or collar C and to the tyre beyond the edges of the said washer or collar, the said
second washer or collar D being perforated with a small hole, as and for the pur-
pose set forth.
ated this 9th day of March 1898.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer & Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.