US966138A - Fastening means for turbine-blades. - Google Patents

Description

G. B. SWEET.

FASTENING MEANS FOR TURBINE BLADES.

APPLICATION FILED JAN-25,1909.

Patented Aug. 2, 1910.

gVVENTOR.

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on rrno STATES PATENT OFFICE.

CHARLES E. SWEET, OF WILFINSBURG, PENNSYLVAFlIA, ASSIGNOR TO THE WEST- INGHOUSE MACHINE.COMPANY, A CORPORATION- OF PENNSYLVANIA.

FASTEN ING MEANS FOR TURBINE-BLADES.

Specification of'Letters Patent. 1

Application filed January 25, 1909. Serial No. 474,626.

and State of Pennsylvania, have made a new and useful. Invention in Fastening Means for Turbine-Blades, of which the following -is a specification.

' This invention relates to turbine bladingu One object is to provide means whereby the blades may be conveniently attached to 'the rotor or sta or so as to reduce the liability of their becoming loose during the operation of the turbine.-

Another object of the invention is to provide means whereby the securing means for v the blades may also'support a protective covering or lining forthe blade-carrying element. It is also the-purpose of this invention to improve generally upon this class-of device.

In the drawings: Figure 1 is a side elevational view of a portion of a blading section;

Fig. 2 is a sectlonal View on the line 22 of F1g.- 1; F 1g. 3- 1s a sectlonal view on the line 3-3 of Fig. 1; Fig. 4 is a sectional view on the line et4 of Fig. 2; Fig. 5 is a detail perspective view of one of the blades;

Fig. Gis a plan yiew of a blade-securing strip to connect the free ends of the blades; and, Fig. 7 is a plan view of. the base strip for securing the blades to the blade-carrying element.

Referring now to the drawings by numerals of reference, in which a preferred embodiment of my invention is shown, 8 designates a rotor and 9 a stator of a turbine of approved construction. The rotor 8 is shown as being provided with a plurality of undercut slots 10 for receiving a base or foundation strip 11. The strip 11 is shown as being provided with a plurality of outstanding projections 12 spaced apart to receive the turbine blades 13. The ends of the projection'12 are reduced as indicated a t 14 to form bendable portions which may be bent in the plane of the stripto provide anchors for the blades.

A bad; 13 is illustrated in dean in Fig. 5 and it 1s shown as comprising a concavoconvex body 'portjon provided at its base end with a hole or o ening 15, while the inner edge of said bla e ad acent to said hole is cutaway asjat 16 to fit a ainst the edge of thGStIlDll in a space ormed by two tective covering or lining therefor.

adjacent projections 12.. The end *br the Patented Aiig. 2, 1910.

blade 18 distant from the base is provided With a'notch 1'7 and adjacentthereto is a hole or opening 18. The hole 15 in thebase of the blade is adapted to receive the reduced portion 14 ofone of the projections 12 so that when said portion 14 is bent, for example in The manner shown 111 Fig. 2, the

blade will be secured to the stripll. The

strip 11 may be arcuate "and of suflicient length tosecur e a number of blades together so that abuilt up section will be provided, a number of which will constitute a ring to fit entirely around the rotor. The section thus 5 formed a may be" secured in undercut slots 10 by thewedges-19. The outer or free ends of the blades 13 may be secured together bya strip 20 similar to the strip 1].

-jacent rows of blades and the flange 23 snugly rests against the surface of the ele-' ment to which the strip is secured (in: this instance the stator). so as to form a pa?- strip 22 is provided with outstanding proj ections 24 spaced apart to receive the blades and having reduced bendable terminals 25 similar to those designated by the reference numeral 14: so that when said blades are in the spaces formed by adjacent projections 24 the reduced portions 25 may be bent'in the plane of the strip after passing through the openi gs 15 so as to lock the blades to. the strip.

By reference to Fig. 4 it will be observed that the flanges 23 project over and; cover thewedges 26 which secure the strips 22in place in the groove 21 so that-while the anges serve as protective coverings for the element to which they are secured they also cover the wedges and prevent theirworking loose, that is, a flange on one strip will cover the wedges for fastening another stri Igwill be apparent in the event itis neces saryfto repair the turbine or ifit is desirable to examine anyof the blades that the whole;

securing the blades to the strip in the rotor.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understoodthat the apparatus'shown is only illustrative and that the invention can be carried out by other means.

hat I claim is: 1.. A base strip for turbine blades having a flange providing a protective covering for the element to which the strip is secured and outstanding projections on the strip adapted to. be bent to form blade anchors.

2. A base strip for turbine blades having a flange projecting from one longitudinal edge and bendable outstanding projections on the opposite 'edge of the strip.

3. A base strip for turbine blades having a flange projecting from one longitudinal edge, and outstanding projections on said strip having ends bendable at angles to the projections to anchor a blade to the'strip.

4. A base strip having projections spaced apart to embrace'turbine blades, the edges of which are 'cut away to bear against said strip, and bendable projections on said base strip to pass through holes in the blades.

5. A base strip having blade engaging projections spaced apart and bendable in the 1pllage of the strip to engage notches in the 7 a. es.

6'. A base'strip having a laterally projecting flange forming aeprotective covering for the element to which the strip is secured, blades secured to said strips, and securing means comprising projections having portions bendable in the plane of the strip to pass through o enings in said blades.

In testimony whereof, I have hereunto subscribed my name this 23rd day of January, 1909.

CHARLES E. SWEET.

lVitnesses C. W. LICG'HEE, GEO. C. \VALKER.

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