Patent ID: 9726026
Date: 2017-08-08
CPC Classifications: F01D,Y10T

Claim:
1. A turbine rotor and blade assembly for a steam turbine, comprising: a rotor; a plurality of buckets positioned about the rotor; and a locking blade positioned about the rotor; the locking blade comprising a base, a first side hook, and a second side hook, wherein the base comprises a first set of protrusions on a first side and a second set of protrusions on a second side, the first set of protrusions defining a first threaded surface, and the second set of protrusions defining a second threaded surface; the locking blade comprising a first side pilot hole defined between the base and the first side hook, wherein the first side pilot hole is at least partially defined by a first thread extending from a top of the first threaded surface to a bottom of the first threaded surface and to a bottom of the base; and the locking blade comprising a second side pilot hole defined between the base and the second side hook, wherein the second side pilot hole is at least partially defined by a second thread extending from a top of the second threaded surface to a bottom of the second threaded surface and to the bottom of the base; wherein the first side hook comprises a first flat side oriented in a radial direction, a second flat side parallel to the first flat side, a third flat side perpendicular to the first flat side and the second flat side, wherein a first radial edge between the first flat side and the third flat side is chamfered, and a second radial edge between the second flat side and the third flat side is chamfered.