Improvements relating to Aluminium.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements relating to Aluminium.
I, HENRY GRIFFITH, Junior, of Warstone Lane, in the City of Birmingham,
Manufacturer, (being a communication from Victor Coppée and Arthur Edward
Kemplen, of Paris), do hereby declare the nature of this invention to be as
follows:-
This invention consists of improvements relating to aluminium, the object
or commercial
being to strengthen or increase the resistance of ordinary
aluminium, and to render the same suitable for cycle frames or cycle parts,
and for other purposes.
The aluminium to be treated in accordance with this invention is placed in a
steel crucible and subjected to a melting temperature in a furnace of such con-
struction that the flame will not come into direct contact with the surface of the
metal.
When the metal in the crucible is completely melted there is added a small
quantity of powdered gray wolfram mixed with a little borax, the proportion of
wolfram to the aluminium varying from 5 to 20 grammes to the kilogramme,
according to the intensity of resistance required from the metal, such resistance
being increased in proportion to the quantity of wolfram employed.
On the addition of the mixture the molten metal is well stirred and is then
poured from the crucible into the ingot or other moulds.
100%
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
Temple Street, Birmingham, Agents for the Applicant.
Improvements relating to Aluminium.
I, HENRY GRIFFITH, Junior, of Warstone Lane 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 consists of improvements relating to aluminium, the object
Or commercial
being to strengthen or increase the resistance of ordinary
aluminium, and to render the same suitable for cycle parts, and for other purposes.
The aluminium to be treated in accordance with this invention is placed in a
steel crucible and subjected to a melting temperature in a furnace of such con-
Price R71

page_text: struction that the flame will not come into contact with the surface of the metal.
When the metal in the crucible is completely melted there is added a small
quantity of powdered gray wolfram (or ore of tungsten) mixed with a little borax,
the proportion of wolfram to the aluminium varying from 5 to 20 grammes to
the kilo-gramme, according to the intensity of resistance required from the metal,
such resistance being increased in proportion to the quantity of wolfram
employed.
The mixture of wolfram and borax before introduction to the molten metal, is
kneaded into a stiff paste, being rendered sufficiently plastic for such purpose
by the addition of a little water, and is then made into a small cake in which form
it is placed into the molten metal in the crucible. On the cake being pushed to
the bottom of the crucible and held there by means of a suitable rod, gases are
generated which in rising through the molten metal and escaping therefrom
produce a violent agitation of the whole contents of the crucible.
In the production of a hard metal when it is necessary to add the hereinbefore
named maximum or nearly the maximum quantity of wolfram, I introduce the
mixture in two or more cakes at different times, as otherwise, if the whole
quantity were introduced at one time, the agitation or bubbling of the liquid
would be so severe as to displace some of the molten metal from the crucible.
When the agitation or bubbling of the molten metal has ceased the whole of
it is well stirred within the crucible and it is then ready for pouring into the
required moulds.
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 method of strengthening or increasing the resistance of aluminium,
substantially as described.
2. The use of wolfram or tungsten ore with aluminium substantially as and for
the purposes described.
T
1
.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicant.