Improvements relating to the Floats of Steam or other Turbines.
Year: 1897

page_text: * Date of Application, oth Oct., 1897-Accepted, 6th Nov., 1897
COMPLETE SPECIFICATION.
Improvements relating to the Floats of Steam or other Turbines.
I, E BERHARD SEGER, of 40 Kammakaregatan, Stockholm, in the Kingdom of
Sweden, 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 steam and other turbines.
In making the wheels of turbines, floats or vanes are employed which are punched
out of metal plate and inserted into slits at the rim of the wheel, said Hoats or
vanes being bent at their bottom end, which reaches inside the rim, so as to bring
said end in contact with the inner side of the rim, and for making the fastening
more secure this end may be held against the rim of the wheel by rings inserted
inside the latter. The slits of the wheel-rim may be curved or straight according
as the floats are curved or flat. Moreover, it has been customary to provide the
bottom end of each float with a slot which on the insertion of the float in the rim
of the wheel embraces the web of the latter, which in this case is left solid, while
the prongs on each side of the slot are inserted into the slits made in pairs at each
side of the web.
The present invention relates to an improved arrangement for fixing the floats
referred to in the wheel-rim, for the purpose of dispensing with the insertion of
the above mentioned rings inside the rim for giving greater security to the
fastening.
The invention referred to is illustrated in the annexed drawing, in which
Figure 1 shows a cross-section of a wheel-rim in which is fastened a float
arranged in accordance with this invention;
Figure 2 represents a section of the same wheel-rim on a line parallel to the
circumference,
Figures 3 and 4 show two different forms of floats provided at their bottom end
with the slot mentioned above:
Figures 5-7 show different forms of floats without such slot;
Figures 8 and 9 illustrate the mode of attaching such floats to a turbine wheel,
and
Figure 10 shows a part elevation of a steam-turbine wheel having attached to
it a few of the floats with and without a slot at their bottom end.
My invention consists in providing each of the long edges of the float at its lower
end with a projection a (Figures 3, 5 and 7) which projections or tongues on the
insertion of the float into the slit of the wheel-rim are bent sideways toward the
latter so as to become lodged along said rim in annular grooves d recessed out of
the sides of it, or bear with their outer edge against projections on the sides of
the wheel-rim. Said tongues a may also be formed as in Figures 4 and 6, by
making incisions or slits c at the lateral edges of the floats.
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:-
An improved float for turbine wheels, consisting of a blank, punched out of

page_text: a metal plate and at its lower end on each side provided with a projection or
tongue (a), either projecting from the edge of the float or formed by making a
slit (c) in said edge, for the purpose after the insertion of the floats in corresponding
slits in the rim of the turbine wheel, of enabling the said floats to be firmly secured
by bending over the projections or tongues against the sides of the rim, so as to cause 5
said projections or tongues to bear with their upper edge against a projecting edge
on the said rim.
Dated this 5th day of October 1897.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.