Improvements in the Manufacture of the Bodies of Pneumatio Tyre Air-valves.
Year: 1893

page_text: Cate of Application, 14th Feb., 1893-Accepted, 25th Mar., 1893
Improvements in the Manufacture of the Bodies of Pneumatio Tyre
Air-valves.
I, ROBERT FREDERICK HALL, of the R. F. Hall Manufacturing Company, of
Sampson Road North, Sparkbrook, in the City of Birmingham, 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:-
This invention relates to the manufacture of the metallic body parts of the air-
valves of pneumatic tyres, and consists primarily in the making of the said body
parts from sheet metal, and by a drawing, or by a semi-drawing process or processes,
of the one form, and by a part drawing and part expanding process or processes of
a second form, and by a part upsetting and gathering in, process or processes, of
the third form as hereinafter described.
Figure 1 of the accompanying drawing represents in side elevation, a pneumatic
tyre air-valve body, in a partially finished state, made according to one form of my
invention.
Figure 2 is a top side plan of the flanged or head end of the same.
Figure 3 is a longitudinal vertical section of the said body Figure 1.
Figure 4 is a transverse horizontal section upon the dotted lines A B Figure 3.
In carrying out the manufacture of the said body part, I take a circular or other
blank Figure 5, and subject the same to a cupping and two or more drawing-
through processes, as represented in Figure 6, and then subject the last named
blank to a series of intermediate and semi-drawing-through processes as represented
in Figure 7.
The respective stages of manufacture are indicated by the letters a, b, c, d, e, f,
g, h, i, j, k.
Thus, I take a blank of ductile metal, Figure 5 and transform the same into the
cup a, by passing the said blank through a suitable shaped die. Then by passing
the cup a through a drawing-through die, the walls of the same are elongated, and
a deeper cup 6 is produced. The cup is passed now through another drawing-
through die, and the walls thinned, and the, walls of the cup contracted. The
elongated cup c, is then passed through a further die, nearly up to the mouth
entrance which leaves a thickening of metal at the boundary edge of the mouth as
represented at d.
.
Then again by a further semi-pass through a further contracted die, the walls
are still further thinned, the diameter reduced, and the mouth entrance slightly
flared, as at e.
The blank e, is now subjected to another pass up to the expansion at the mouth
end, as at f, and again and again, forming partly formed bodies y, h, 2, and in each
semi-pass, the partly formed bodies are taken through the die, up to the expansion
or flare, which is subsequently, as hereinafter described, transformed into a flange
or head.
It will be understood that these partly formed bodies, after passing nearly
through the die, are then returned or lifted bodily from the dies by the mandril,
and then removed by a stripper, or the said partly formed bodies are removed
from the dies by a kuocker-out or ejector.
The partly formed body j, with its flared mouth, is then transformed into a still
further elongated figure k. Then by a further process, the walls of the flared
mouth are, by a tool or punch, spread out horizontally or transversely into a flange,
enlarged end or head, as represented in Figures 1, 2 and 3.

page_text: Figures 8, 9 and 10 represent a further process of producing valve body parts,
but with the initial and intermediate operations omitted.
In carrying out this said process, I cut out from sheet metal, a blank, which is
then cupped, elongated and the thickness of the walls reduced, and formed into a
conical tubular cup, Figure 8.
Then, by subsequent processes, I reduce the diameter by passing the same into
suitably shaped dies up to near the open end, forming a partly made valve body
Figure 9.
Then by subsequent processes, I still further reduce the diameter, and turn
down the walls at the flared entrance, forming the head, with body part, of an air
valve, as in Figure 10.
As a still further form of my invention, I cut out, cup and elongate a blank of
ductile sheet metal, and form an elongated tube Figure 11. Then I elongate the
same, and reduce the thickness of the walls thereof, and by an upsetting tool, I
upset the boundary walls of the mouth entrance, thereby thickening the metal at
the said entrance, (see Figure 12) which thickened part is subsequently spread out
into a head (see Figure 13).
Thus, I take the partly formed body Figure 12, and reduce the diameter of the
tubular part of it, up to the enlarged end. Then by means of a stamp or press
tool, I spread out the upset and thickened metal into a flange or head, as in
Figure 13.
In carrying out a still further form of my invention, I take a length of drawn
tubing Figure 12, a little longer than the valve body to be produced, and of about
the inside and outside diameters which the same is to acquire. Then by means of
opening-out tools, I flare the entrance at one end, and form the same as in
Figure 15.
•
By subsequent treatment, the said partly formed body Figure 15, is fashioned
into that of Figure 16.
It is understood that in the last two processes of manufacture, intermediate
operations are carried out in their successive orders. Further, I might add that
the walls at the mouth of the flared entrance may be thickened by an upsetting
process, prior to the said mouthing.
Figure 17 represents in elevation (with the lower part in section) the valve body
part in its finished state, showing the lower end of the same cut off or pierced and
'countersunk.
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 :-
First Manufacturing pneumatic tyre air-valve bodies from sheet metal by a
drawing, or a part drawing process or processes.
Secondly: Manufacturing pneumatic tyre air-valve bodies from sheet or
wrought metal by part drawing, and part expanding and heading, as set forth in
Figures 1 to 10.
:-
Thirdly -Manufacturing pneumatic tyre air-valve bodies from sheet or
wrought metal, by a part drawing process or processes, and a part upsetting, as set
forth in Figures 11 to 13.
Fourthly Manufacturing pneumatic tyre air valve bodies from lengths of
wrought metal tubing by expanding, upsetting and spreading processes, as described
and set forth in Figures 14 to 16.
Dated this 11th day of February 1893.
ROBERT FREDERICK HALL,
By Henry Skerrett,
6, Livery Street, Birmingham, Agent for Applicant.