Patent ID: 7399137

Claim:
A pivot arrangement between a mirror head and a mirror mounting bracket of a rear vision mirror, the arrangement including: a detent arrangement having a plurality of projections and mating recesses between the mirror mounting bracket and the mirror head that enables rotation of the mirror head with respect to the mirror mounting bracket from a locked position wherein said projections engage said recesses, where the mirror head is held in a selected position with respect to the mirror mounting bracket, to a disengaged position wherein said projections and said recesses are disengaged, in which the mirror head is rotated with respect to the mirror mounting bracket; a spring assembly adapted to apply force against the detent arrangement, the spring assembly including at least one disc spring moveable with said mirror head between said locked position and said disengaged position, wherein said at least one disc spring has a preloaded position when said spring assembly is in said locked position and said at least one disc spring becomes compressed upon the movement of said spring assembly from said locked position to said disengaged position, wherein said at least one disc spring has a negative spring rate when compressed from said preloaded position; and a concave bevel in said mirror head, said concave bevel is positioned adjacent said at least one disc spring, wherein at least one disc spring will be received in said concave bevel when compressed.