Year: 1895

page_text: I, JOHN SMITH RAWORTH, of 24 Kirkstall Road, Streatham, in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:
My invention has reference to improvements in the construction of the wheels
of steam turbines.
According thereto the buckets or vanes of a turbine wheel are made separately
of metal stamped milled or otherwise formed to the required size and shape.
These buckets or vanes thus formed are then built up into a ring, with or without
separate intermediate packing pieces, the shanks of the buckets or vanes being
arranged to point to the centre of the ring and the whole bound together by a
pair of external circular clamps, leaving the shanks exposed. The shanks are then
welded into a solid boss or ring so that the whole becomes one piece of metal
constituting a turbine wheel which can then be bored turned and fitted on a
spindle.
Dated this 18th day of February 1895.
W. LLOYD WISE,
40 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
I, JOHN SMITH RAWORTH, of 24 Kirkstall Road, Streatham, in the County of
Surrey, 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:
1
My invention has reference to improvements in the construction of the wheels
of steam turbines.
According thereto the buckets or vanes (hereinafter called buckets) of a turbine
wheel are made separately of metal stamped, milled or otherwise formed to the
required size and shape. The buckets thus formed are then built up into a ring,
with or without separate intermediate packing pieces, the shanks of the buckets
being arranged to point to the centre of the ring and the whole bound together by
a pair of external circular clamps, leaving the shanks exposed. The shanks are
then welded into a solid boss or ring so that the whole becomes one piece of metal
constituting a turbine wheel which can then be bored turned and fitted on a
spindle.
In the accompanying drawings,
Fig. 1 is a cross section through one half of a steam turbine showing the manner
of constructing the same according to this invention; and
Fio 2 is a side view of two adjacent buckets with interposed packing piece.

page_text: AA are the buckets made separately of the required size and shape as mentioned
and each formed with a shank B. Care packing pieces that are arranged between
the shanks of adjacent buckets and each of which may be either a separate piece,
or be formed in one piece with a bucket and shank. D, D are external annular
clamps for holding the buckets and packing pieces in the form of a ring during the
process of welding together their exposed inner ends, which may be done by the
aid of an electric are welding apparatus or gas welding apparatus as well under-
stood. The clamps may be held together by any suitable means, such as by bolts E.
The dotted lines Faround the shank B (Fig. 1) indicate how additional metal may
be built up in the welding process around the inner ends of the shanks to form an
enlarged boss which may afterwards be turned and bored to adapt the finished
turbine wheel to be secured on a shaft.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
a
1. The construction of a steam turbine wheel as set forth, namely, making
number of separate buckets or vanes with shanks, placing them together in the
form of a ring (with or without intermediate packing pieces) so that the shanks of
the several buckets or vanes point to the centre of the ring so formed, binding the
whole together by clamps in suchwise as to leave the shanks exposed, welding the
shanks into a solid boss or ring thus converting the set of buckets or vanes with
their shanks into one piece of metal constituting the turbine wheel, all substantially
as herein before described.
2. The herein described and illustrated improved manufacture of steam turbine
wheels.
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.