Improvements in and in the Manufacture of Metal Car-wheels for Railways or analogous purposes.
Year: 1894

page_text: Date of Application, 21st May, 1894-Accepted, 7th July, 1894
COMPLETE SPECIFICATION.
Improvements in and in the Manufacture of Metal Car-wheels for
Railways or analogous purposes.
I, HERMANN SICHELSCHMIDT of Bochum, Dortmund in the Empire of
Germany, Engineer and Factory Director 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:-
It is a great advantage to make steel car wheels with as few parts seams welds
or joins as possible because such parts or joins are loosened or become loose in
consequence of the jolts and shocks to which the wheels are exposed in running on
railways generally and especially on badly laid rail-tracks or tracks in a bad state
of repair.
The use of screw bolts or rivets is also to be avoided as much as possible on
account of the weakening or reduction of the sectional area thereby necessarily
incurred. The employment of welded joints should also be avoided as much as
possible on account of the partial deterioration in the quality of the metal sheet.
resulting from the welding process which frequently accounts for breakage of the
parts near the connecting places in consequence of the action of the unavoidable
vibrations upon such parts when in use.
Now this invention relates to a metal car-wheel in which the disc or web part of
the wheel body is provided with a nave which after same is inserted in position has
an annular bulge or collar forced or formed integral thereon on each side of said
disc or web part which latter is thereby tightly compressed gripped and held
between said collars on the nave and thus firmly secured that is to say the nave is
not fixed on either by means of bolts or rivets or by welding of any joint or
joints.
In the accompanying drawing:
:-
Fig. 1 is a plan of part of a finished wheel according to my present invention.
Fig. 2 is a cross sectional view through the diameter of Fig. 1.
Fig. 3 shows the nave before its connection with the wheel disc.
A circular plate of sheet steel is pressed under the forging press into the desired
form of a car-wheel (or the central disc portion or web and flange rim or tyre of a
wheel may be formed from any suitable metal in any suitable manner to answer
ny purpose) having a central hole or opening provided therein for the subsequent
reception of the nave.
The shape of the nave in cross section is shown in the accompanying drawing
at Fig. 4 as of square or four-sided shape though it may be of any other suitable
shape.
The nave-piece or block 6 (which may be solid or hollow in which latter case
it is mounted on a mandril for the purpose of preserving the bore) is first heated
and then pushed into the hole in the wheel disc a said hole and said block b being
advantageously made to correspond in shape.
The disc or web part of the wheel itself is advantageously not previously
heated.
The nave piece is now by the aid of the forging press or other suitable means
compressed endwise and so as to form a collar on each side of the disc or web of
the wheel said collar being pressed up close against the said disc or web part in
such a manner as to form two annular bulges or collars c which encircle the nave.
and serve to rigidly connect the nave to the disc or web.
This connection is rendered still frmer by the contraction in consequence of
cooling

page_text: If desired -one of the annular bulges or collars such as e may be previously
formed before inserting the nave in the wheel so that only one such collar has to
be forged or formed after same is placed in its position.
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 car-wheel in which the nave is connected to the other part forming the
wheel by being tightly fastened thereto by two annular collars forged on or formed
integrally with the nave.
2. A car-wheel consisting of a metal disc or web and flange rim or tyre having a
hole in the centre thereof a metal nave of a shape with which the said hole is made
to correspond an annular bulge or collar forged or formed integrally on said nave
and adapted to fit up close against one side of said disc or web and a second and
separate annular bulge or collar-adapted to fit up tightly against the other side of
said disc or web-forged or formed on said nave after same has been placed in
position substantially in the manner and for the purposes hereinbefore set forth.
3. A car-wheel consisting of a metal nave inserted in the centre of a metal disc
or web and flange part these parts being tightly and permanently secured together
by a collar or annular bulge formed integrally on said nave each side of said disc
substantially in the manner and for the purposes hereinbefore set forth and illus-
trated in the drawings hereunto annexed.
4. The manufacture of car-wheels from suitable metal by forging or forming by
compression of the nave after the latter has been inserted in a central hole in the
wheel-two collars on said nave (one on each side of the web of said wheel) which
are forced towards each other so as to grip the web of the wheel tightly between
them.
5. The manufacture of car-wheels from suitable metal by forging or forming by
compression of the nave-after the latter has been inserted in a central hole in the
wheel-two collars on said nave (one on each side of the web of said wheel) which
are forced towards each other so as to grip the web of the wheel tightly between
them substantially as and for the purposes described and illustrated in the drawings
hereunto annexed.
6. The improved manufacture of car-wheels in the manner and for the purposes
hereinbefore described and as illustrated by way of example in the drawings here-
unto annexed.
Dated this 21st das of Mar 1904
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.