ements in ne Wheels for Steam or Gas Turbines.
Year: 1896

page_text: Date of Application (in United Kingdom), 7th Aug., 1896
Complete Specification Left, 6th May, 1897-Accepted, 12th June, 1397
ements in
ne Wheels for Steam or Gas Turbines.
I, JOHN SCHMIDT, of Bergsgatan 13 B, Stockholm, Sweden, do hereby declare
the nature of this invention to be as follows:-
The invention has reference to a construction of wheel turbine for steam or gas
turbines wherein the buckets are inserted sidewise into the body of the wheel in
which they are fastened by a suitable formation of their shanks.
In one construction, each bucket has a curved body part, an outer part closing
the bucket compartment or cavity at the circumference, and a shank. This latter
is provided at its inner part with a bulb or enlarged portion running across the
breadth of the shank and conveniently of cylindrical shape, and the body of the
turbine wheel, which is of disc-like shape is provided with a number of holes or
recesses corresponding to the bulb-like or enlarged ends of the shanks and from
each of which a radial or nearly radial groove corresponding to and adapted to
receive the shank of a bucket extends to the circumference of the disc-like body,
the number of holes or recesses with grooves corresponding to that of the
buckets.
The buckets are placed in position by introducing their shanks and enlarged
ends one by one into the grooves and holes or recess, the holes or recesses being
arranged in two annular series at different distances from the centre of the body,
When all the buckets. have been thus placed in position, the disc-like body may be
subjected to lateral pressure, if required for rivetting the bulb or enlarged parts of
the shanks and for causing the shanks to completely fill the grooves in the
body.
Dated this 7th day of August 1896
Improvements in Turbine Wheels for Steam or Gas Turbines.
I, JOHN SCHMIDT, of Bergsgatan 13 B, Stockholm, Sweden, 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 has reference to a construction of turbine wheel for steam or gas

page_text: turbines wherein the buckets are inserted sidewise into the body of the wheel in
which they are-fastened-by a suitable formation of their shanks.
Fig. 1 of the accompanying drawings is a side view of a part of a turbine wheel
according to this invention with its buckets inserted in the body of the wheel;
Fig. 2 is a side view of part of the body of the wheel without its buckets;
Fig. 3 is a central section of the turbine wheel; and
Figs. 4 and 5 are respectively a side and an end view of a bucket.
Each bucket has a curved body part a, an outer part 6 that closes the bucket
compartment or cavity at the circumference of the wheel, and a shank.c. This
latter is provided at its inner part with a bulb or enlarged portion d which runs
across the breadth of the shank and is preferably of cylindrical shape, and the
body A of the turbine wheel, which is of disc-like shape is provided with a
number of holes or recesses e, which correspond to the bulb-like or enlarged ends d
of the shanks c and from each of which a radial or nearly radial groove or
slot corresponding to and adapted to receive the shank c of a bucket extends
to the circumference of the disc-like body A, the number of holes or recesses e
with grooves or slots f corresponding to that of the buckets.
When all the
The buckets are placed in position by introducing their shanks c and enlarged
ends d one by one into the grooves or slots f and holes or recesses e.
buckets have been thus placed in position, the disc-like body A may be subjected
to lateral pressure, if required, for causing the shanks c to completely fill and
become fast in the grooves or slots f in the body A, whose walls to this end are
preferably not plane but slightly concave towards the grooves or slots.
As a result of my improved construction, the body of a turbine wheel can be
made massive and in one piece, and there can be employed separate buckets that
can be manufactured sufficiently long and in the desired form, which is not the case
when the buckets are made by being cut from a massive disc or body.
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 1
claim is :-
1. A body for rapidly rotating steam or gas turbine wheels, consisting of a disc
provided at its outer peripheral portion with radial or approximately radial grooves
or slots terminating at their inner ends in wider holes or recesses, substantially as
and for the purpose set forth.
2. A bucket for rapidly rotating steam or gas turbine wheels having a shank
provided at its inner end with a transverse bulb or enlarged portion substantially
as and for the purpose set forth.
3. In a rapidly rotating steam or gas turbine, a turbine-wheel comprising a disc-
like body made in one piece and provided at its circumference with radial or
approximately radial grooves or slots terminating at their inner ends in wider holes
or recesses, and buckets each having a compartment or, cavity, an outer part that
closes the said compartment or cavity radially, and a shank provided with a
transverse bulb or enlarged portion at its inner part, each shank and bulb or
enlarged part fitting in one of the said grooves or slots and holes or recesses,
substantially as set forth.
4. Steam or gas turbine wheels constructed and arranged substantially as
herein before described with reference to and, shown in. the accompanying drawings.
Dated this 6th day of May 1897.
W. LLOYD WISE,
46 Lincoln's Inn Fields, Loudon; W.C., 'Chartered Patent Agent.