Improvements in Casting Toothed Machine Parts or other Machine Parts of Various Kinds, and Apparatus for this purpose.
Year: 1896

page_text: Date of Application, 16th May, 1896-Accepted, 3rd Oct., 1896
COMPLETE SPECIFICATION.
Improvements in Casting Toothed Machine Parts or other Machine
Parts of Various Kinds, and Apparatus for this purpose.
I, FRANZ LUDEWIG of 19 Feldstrasse, Dusseldorf, in the Empire of Germany,
Engineer, 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 toothed machine parts of all kinds
the essential feature of this invention being that the mould-or the device which
contains the mould and thereby the mould-is quickly rotated during the process
of casting from which it results that the metal is compressed or rendered denser
or stronger (by the centrifugal action which is set up) at the circumference
(that is to say where the teeth are situated) than at the other portions of the
wheel.
The process is hereinafter fully explained with reference to the accompanying
drawings.
In casting a toothed wheel the mould a is caused to rotate rapidly by means
of the pulley b as shewn in Fig. 1 whilst the molten metal is poured in through
the gate or funnel c which is arranged over the centre of the wheel.
Under the action of the centrifugal force induced the molten metal is projected
with force towards the circumference and there it is most compressed, imparting to
that portion of the wheel where it is most needed the greatest density and strength.
A further constructional form of a device suitable for casting toothed wheels is
shown in Fig. 3. Here the molten metal can be admitted both at the centre and
on the periphery of the mould a' which is in this instance suitable for casting bevel
wheels..
Figs. 4 and 5 illustrate an arrangement by means of which toothed rods or racks
can be cast whilst employing the same process.
In this case the moulds a² which are to serve for casting the toothed rods
or racks are arranged on the periphery of a wheel which is rapidly rotated; the
inlet pipes for the molten metal converge in a common centrally-situated inlet
funnel or gate.
The same process can be employed with equally good results in casting fly-
wheels, pulleys, and in general rotating bodies of all kinds. By this process the
separate molecules are compressed into various layers of different densities according
to the centrifugal force set up.
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 new process for the production of toothed machine parts or other
machine parts of various kinds consisting of rapidly rotating the mould while the
casting is taking place so that by the resulting centrifugal action the molten
metal is compressed or rendered denser at those portions of the casting furthest
from the centre.
2. In apparatus for the production of toothed machine parts and other machine
parts of various kinds according to the process claimed above-the arrangement_
and combination with a rotary support of a mould mounted or arranged in or on

page_text: said support means to rapidly rotate said support and mould and means provided
on said mould to pour in the molten metal into said mould during its rapid
rotation substantially in the manner and for the purposes herein before set forth.
Dated this 15th day of May 1896.
TONGUE & BIRKBECK,
Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.