Actuation ring for variable geometry compressors or gas turbine engines

Claim 1

In an axial flow compressor having an outer casing a circumferential row of vane shafts projecting from the casing and levers projecting from these shafts an actuation ring to which the outer ends of the levers are connected, said actuation ring comprising at least two sectors of less than 180* angular extent bridge members interconnecting said sectors to form a 360* structure encircling the casing, said bridge members spanning and overlyinG, respectively, adjacent end portions of said sectors, each overlying bridge portion being secured to and positioned relative to the respective end portion of the sector by a dowel bushing projecting radially through said bridge member and sector with a tight fit therebetween to accurately position said bridge member and sector in an angular sense, a first bolt extending through said bushing with a loose fit a first nut threaded onto the inner end of said first bolt a second bolt, angularly offset from the first bolt and extending through aligned radial holes in said bridge member and sector with a loose fit and a second nut threaded onto the inner end of said second bolt.