Patent ID: 7731463

Claim:
A locking device for preventing rotation of a first component relative to a second component to which the first component is connected, the second component having one or more preformed holes and the locking device comprising: a locking plate having a component engaging portion to engage the first component to substantially prevent rotation of the locking plate relative to the first component, a first grooved surface of the locking plate having first grooves and one or more fixing holes each for registration with a corresponding one of the preformed holes in the second component; and a medial plate to be attached, in use, to the second component between the second component and the locking plate, the medial plate having a receiving hole to be fitted over the first component and a second grooved surface with second grooves to engage with the first grooved surface of the locking plate, with the second grooves of the medial plate arranged to extend along circumferentially spaced substantially radial lines extending from substantially the center of curvature of the receiving hole, wherein the first grooved surface of the locking plate engages with the second grooved surface of the medial plate, whereby one or more fixing members each are passed through a corresponding one of the fixing holes and into the corresponding one of the preformed holes in the second component securing the locking device to the second component and forcing the first grooved surface of the locking plate into engagement with the second grooved surface of the medial plate.