An Improved Wrought Metal Plough Share, and an Improved Method and Apparatus for Manufacturing the same.
Year: 1894

page_text: Date of Application, 26th June, 1894-Accepted, 4th Aug., 1894
COMPLETE SPECIFICATION.
An Improved Wrought Metal Plough Share, and an Improved
Method and Apparatus for Manufacturing the same.
I, JAMES ROBINSON of Britannia Foundry, Railway Terrace, Gawler Railway
Station in the Province of South Australia, Machinist, 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 applies to the manufacture of plough shares of wrought iron or
steel or partly of one and partly of the other metal.
It enables the socket of the share to be made solid of one piece of metal
without cut, join, weld or rivet, and a steel point may be attached to a wrought
iron share without any additional expense in the manufacture.
My object is to form the socket solid and without any cutting which might
weaken the share or the socket, the socket being formed with a full rim and of
the same strength as a hand wrought share. I accomplish this object by the
method hereinafter described, and at cost of about one third of that usually
required for wrought shares of a like quality and description. Another advantage
secured by my invention is that by its adoption the grain of the metal constituting
the socket is formed in the way that laps round the foot so as to give the greatest
strength where it is required.
An
In the manufacture of shares according to this invention, I take a piece of bar
or faggot iron preferably but not necessarily of the shape shown in Figure 1.
ordinary piece of bar or faggot iron of the proper weight may be used, but it would
not be quite so readily pressed into shape. A porter bar of either iron or steel is
attached to the point end of the piece of metal for convenience of handling. By
this means also steel points upon wrought iron shares may be obtained without any
additional expense of manufacture, the whole being stamped in practically one
operation and only requiring closing together afterwards.
The piece of bar or faggot iron or metal of the shape described A in Figure 1,
with porter bar A³ of iron or steel as may be desired is heated and placed between
specially constructed dies of the shape illustrated in Figures 2, 3 and 4. Figure 2
is a plan of the bottom die; Figure 3 is an upside down plan of the top die,
Figure 4 is a vertical section on line a-b in Figures 2 and 3, of the two dies
showing the share in between after it has been pressed. The piece of metal A
having been placed upon the bottom die B as shown in dotted lines in Figure 2
the upper die C is pressed down by a steam hammer, drop hammer or hydraulic
press, whereby the metal is forced into the requisite shape to form the flat side of
the share underneath as required, and portion thereof is forced upwards thereby
forming the expanded socket A2 by means of the parts A³ A' which are in solid
connection with the other part of the share. The share is now complete, except
that the parts A3 and A' forming the rim of the socket are as regards their outer
edges in an expanded position as illustrated in Figure 5. In order to bring them
into the required position a foot block Z of the necessary shape according to the
kind of plough to be fitted is provided and inserted in the socket. The expanded
parts A and A' are then while warm pressed or hammered over the said foot and
thereby the socket is completed. This operation of closing the parts may be
performed partially or wholly by hand or partly by hand and partly by stamp dies
or presses.
I prefer to use another paid or stamp dies which are illustrated in
Figure 6. The bottom die is in the exact shape of the flat side of a finished
plough share, and the top die E is the exact shape of the socket side of the finished
share, with the foot inserted. The hot share of the shape shown in Figure 5 is

page_text: placed upon the die D, the foot Z is inserted, and upon the top die E closing down
the socket is formed completely, evenly and uniformly in one piece of metal solid
with the share and having a solid rim with no cut, perforation, weld, join or rivet.
A pin hole may be drilled in the usual manner. When I say there is not any
cut, weld, join, rivet or perforation, I mean there is not any cut, weld, join, rivet or
perforation to lessen the strength of the share especially of the socket, the pin hole
and the porter bar being no detriment or weakness.
The completed share is shown in Figure 7.
I have described and illustrated the tools for one kind of share, but all kinds of
shares can be produced by this invention to suit and fit the various kinds of plough
feet. It will be understood that the tools and dies are varied to the shape of share
and socket required but the principle and operation of my invention apply equally
to all.
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. A wrought metal plough share stamped or pressed out of a solid metal blank
and having neither cuts, welds, joints or rivets, substantially as herein described
and as illustrated in my drawings.
2. The berein described method of manufacturing wrought metal plough shares
consisting in stamping a heated metal blank between a pair of dies so as to form
projecting lugs (such as A3 and A') thereon, then bending and closing said lugs
over a foot block in order to complete the formation of the socket, thereby
producing a share having neither cut, weld, joint or rivet, substantially as herein
specified and as illustrated in the accompanying drawings.
3. The apparatus herein described for making my improved wrought metal
plough share, consisting of the stamps, dies and foot block herein described and
illustrated in my drawings.
Dated this Nineteenth day of May 1801
JAMES ROBINSON.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.