Improvements in and in the Manufacture of the Bodies of Inflating Valves for Pneumatic Tyres.
Year: 1898

page_text: Date of Application, 10th Feb., 1898
Complete Specification Left, 1st Oct., 1898-Accepted, 3rd Dec,
1898
PROVISIONAL SPECIFICATION.
Improvements in and in the Manufacture of the Bodies of Inflating
Valves for Pneumatic Tyres.
I, CHARLES THOMAS BROCK SANGSTER, Works Manager to The Cycle
Components Manufacturing Company Limited, of Bournbrook, near the City of
Birmingham, do hereby declare the nature of this invention to be as follows:-
"
This invention relates to the manufacture of tubular bodies of tyre valves of
the "Dunlop tyre, otherwise known as Woods valve, and has for its objects, to
simplify the process of manufacture and to improve the appearance of the body,
by forming the same with parallel sides (which are screwed) throughout its length
instead of having an annular groove near one end, formed by gathering in or
contracting the metal to form the seating for the rubber sleeve of the valve.
According to my invention, the valve body is made from a length of tubing,
which is thickened at one end by drawing-through. The body thus formed is
parallel sided upon the whole length of the outside, whilst the bore is of two
diameters. The said body has the usual head at the inner end.
In carrying out my invention, I take a length of tubing, of an inside bore
throughout equal to that of the great part of the body to be made. This is then
slipped onto a mandril, of an external diameter equal to the inside diameter of the
tube, except at the fore end where it is reduced or necked. The tube, with mandril,
is then forced through a die, when the metal is displaced, thickened and gathered
in so as to follow the shape of the reduced end of the mandril, thus producing a tubular
blank, the walls of which are considerably thickened on the inside near one end,
thus reducing the bore at this part. The thickened end is then counter-bored for
a suitable distance so as to form a seating of the required shape, with a throttling
separating it from the major part of the bore, which is of the original diameter
The exterior of the body is next wormed and the head end set up by expansion of
the metal in the usual way.
11
1909
Improvements in and in the Manufacture of the Bodies of Inflating
Valves for Pneumatic Tyres.
I, CHARLES THOMAS BROCK SANGSTER, Works Manager
to The Cycle
Components Manufacturing Company Limited, of Bournbrook, near the City of

page_text: Birmingham, 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 the manufacture of tubular bodies of tyre valves of
the "Dunlop tyre, otherwise known as Woods valve, and has for its objects, to
simplify the process of manufacture and to improve the appearance of the body,
by forming the same with parallel sides (which are screwed) throughout its length
instead of having an annular groove near one end, formed by gathering in or
contracting the metal to form the seating for the rubber sleeve of the valve.
According to my invention, the valve body is made from a tubular blank or from
a length of tubing, which is thickened at one end by drawing through so as to
reduce the bore and then the thickened part is counterbored to form the valve
seating. The body thus formed is parallel sided upon the whole length of the
outside, whilst the bore is of two diameters. The said body has the usual head at
the inner end.
Figures 1 and 2 represent two different elevations of the improved valve body
produced by my process, Figure 3, is a vertical section of the same upon the dotted
line, Figure 2 and Figure 4 another vertical section, but taken upon the
dotted line, Figure 1. Figure 4* is a cross section of Figure 4 upon the dotted
line.
In carrying out my invention, I take a tubular blank, such as represented in
section in Figure 5, of an inside bore throughout equal to that of the great part of
the body to be made. This is then slipped onto al mandril of an
external diameter equal to the inside diameter of the tube, except at the
fore end where it is reduced or necked. The blank with mandril,
is then forced through a die, when the metal is displaced thickened and
gathered in so as to follow the shape of the reduced end of the mandril, thus
producing the tubular blank shown in section in Figure 6, the walls of which are
considerably thickened on the inside near one end, thus reducing the bore at this
part. A head is formed on one end as represented in Figure 7, and then the other
and closed end is cut off, producing Figure 8. The thickened end is then counter-
bored for a suitable distance as indicated by the dotted lines in Figure 8, as to
form a seating of the required shape, with a throttling separating it from the major
part of the bore, which is of the original diameter. The exterior of the body is
next wormed, when the body part is finished.
In Figures 1 to 4 showing the finished article, the body part is marked a,
and the head a¹, whilst a² is the intact part of the bore, a³, the throttled part
formed by the drawing through, at the valve seating made by the counterboring,
the flat edges, the outside screwings and the notches which receive the ribs
on the valve stalk.
Instead of fashioning the body from a tubular blank closed at one end, the same
may equally well be produced from an open ended length of tubing, whilst I also
wish it to be understood that my method of forming the valve seating by counter-
boring a thickened end produced by drawing through is also applicable to valve
bodies which are of two or more diameters on the outside instead of being
parallel-sided.
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:
First Making the bodies of tyre valves from a tubular blank or length of tubing,
one end of which is thickened-by drawing through or otherwise-so as to reduce
the bore and then counter-boring the said thickened part to form the valve seating,
substantially as described and set forth.
Secondly-Making the bodies of tyre valves from a tubular blank or length of
tubing, one end of which is thickened-by drawing-through or otherwise-so as to

page_text: reduce the bore, which thickened part is then counter-bored so as to form the valve
seating but still preserving the parallelism of the outer sides, substantially as
described and set forth.
Dated this 30th day of Sentember 1808
CHARLES THOMAS BROCK SANGSTER.
By Henry Skerrett,
24, Temple Row, Birmingham, Agent for Applicant.