Rotary tactile feedback apparatus for a switch

A rotary tactile feedback apparatus for a multi-position switch or encoder, the apparatus comprising a housing, a rotary member 1 rotatably mounted on the housing, a first detented surface 2 comprising a plurality of discrete projections and recesses to define a plurality of discrete switch positions of the rotary member and a second detented surface 3 defining a plurality of projections and grooves to provide a stepped resistance to movement of said rotary member during rotation between said discrete switch positions, a leaf spring 6 being mounted on the housing to extend tangentially to the first and second detented surfaces, the free ends of the leaf spring 6 being radially urged against said first and second detented surfaces.