Anti-rotation locking assembly

摘要

An anti-rotation locking assembly is provided for preventing rotation of a surface such as in a housing member with respect to a threaded shaft as on a body to which the housing member is threadably mounted. There are provided two opposing flats or relief surfaces on the end of threaded shaft extending beyond the housing surface. A recess is provided in the surface around the hole for accepting a locking c-ring. The recess has a non-circular profile in the plane of the surface to prevent rotation of the ring in the hole. A ring having an outer profile matching that of the recess is provided. The ring has outer dimensions and a shape to its sides which will cause its periphery to engage and cam over the sides of the recess. A threaded nut is provided for threading on the shaft over the ring to press the sides of the ring into the recess so as to cause the ring to grip the flats and engage the sides of the recess upon tightening. Preferably the profile of the recess and the ring is hexagonal with the ring having straight sides and the recess tapered sides. The ring is also preferably of harder material than the sides of the recess so that the sides of the recess will be plastically deformed after elastic deformation of the ring has caused it to grip the flats of the threaded shaft.