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Патент USA US3051451

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Aug. 28, 1962
R, w. CHANDLER
AIR DRIVEN TURBINES
Filed July 20. 1960
43,051,44Q
United States Patent 0 P 1 cc
2
1
3,051,440
AIR DRIVEN TURBINES
Robert Walter Chandler, Solihull, England, assignor to
Rotax Limited, London, England
Filed July 20, 1960, Ser. No. 44,179
Claims priority, application Great Britain July 27, 1959
1 Claim. (Cl. 253—77)
3,051,440
Patented Aug. 28, 1962
break under the centrifugal forces due to its own weight
and that of the blades c which it retains when the turbine
is rotated at a predetermined speed above its normal op
erating speeds. In the event of the band at being broken
when the rotor is rotating all the blades will be thrown
from the body part by centrifugal forces thus restoring
the dynamic balance of the rotor. Moreover, as soon as
the blades of the rotor are detached the rotor will start
to slow down since there are no suitably shaped parts on
This invention relates to air driven turbines more par
which
the air jets can react to impart the rotation. Con
ticularly for use on aircraft, and of the kind having a 10
veniently, some of the dowels or like parts b extend
rotor comprising a central body part carrying a plurality
through their associated blades into holes or recesses on
of equi-angularly spaced peripheral blades.
the band as shown at b1 so as to locate the band d against
In the event of a blade of such a turbine rotor becom
axial movement.
ing detached, or being broken away, the dynamic bal
It has been found in experiments that the detached
ance of the rotor is upset with the result that there is a 15
blades and/ or broken parts of the band can pass from the
grave risk of the rotor as a whole breaking up if it con
turbine exhaust without serious damage such as is likely
to occur in the event of the body part of the rotor break
ing up.
object of the present invention is to provide a turbine 20 Having thus described my invention what I claim as
new and desire to secure by Letters Patent is:
rotor in a convenient form whereby the breaking away
A rotor for an air-driven turbine of the kind speci?ed,
or detachment of a rotor blade will ensure release of the
comprising in combination a central body part, a plural
other rotor blades to restore the dynamic balance of the
ity of blades extending in equi-angularly spaced relation
rotor, and cause the body part of the rotor to slow down.
According to the invention, in a rotor for an air driven 25 ship from the periphery of said body part, projections
rigid with said blades and extending therefrom into axially
turbine of the kind speci?ed the blades are freely located
slidable engagement with openings in the peripheral por
relative to the central body part and are held in position
tion
of said body part, and an endless band which encir
by means of an encircling member which is locally weak
cles said blades to hold them in position on said body
ened at at least one angular position.
‘
An example of the invention is illustrated in part-sec 30 part, and which has at least one weakened portion for
tinues to rotate at high speeds. Such breaking up of the
rotor may have very serious consequences, more particu
larly when the turbine is mounted in an aircraft, and the
tional side elevation in the accompanying drawing.
enabling said band to be broken by centrifugal forces, due
Referring to the drawing, the rotor comprises a central
body part a which is dynamically balanced and has in its
rotor exceeding its normal maximum speed by a prede
peripheral portion a plurality of equi-angularly spaced
termined amount.
recesses or holes for the reception of pairs of dowels or 35
similar projections b on the turbine blades 0, each blade
having a pair of the dowels or similar projections secured
thereto so as to extend therefrom in parallel relationship
with each other into axially slidable engagement with the
corresponding recess or holes in the peripheral portion of 40
the central body part.
Encircling the blades 0 is an endless band d which
serves to retain the dowels or similar projections b of the
blades within their locations in the body part a. The ar
to the weight of said band and blades, in the event of the
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,469,045
1,634,897
2,310,412
2,349,187
2,942,843
2,965,355
MacMurchy _________ __ Sept. 25,
Davis ________________ __ July 5,
Flanders _____________ __ Feb. 9,
Meyer ______________ __ May 16,
Sampson ____________ __ June 28,
Spaeth ______________ __ Dec. 20,
342,900
405,301
532,372
537,455
837,495
1,223,925
Germany ____________ __ Oct. 26,
Italy ________________ __ Feb. 19,
Great Britain _________ __ Ian. 22,
Great Britain _________ __ June 23,
Germany ___________ _.. Apr. 28,
France _______________ _.. Feb. 1,
straining the blades from radial disengagement from the
body is the encircling band d. The latter is locally weak
ened, as by holes, at at least one, but preferably as shown 50
three equi-angularly spaced positions 2, and is designed to
1923
1927
1943
1944
1960
1960
FOREIGN PATENTS
rangement is such that the pairs of dowels or like projec 45
tions b serve to locate the blades 0 against angular move
ment relative to the body part, but the sole means re
..
1921
1942
1941
1941
1952
1960
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