Patent ID: 8152124

Claim:
An adjustable support arm for a vehicle exterior rearview mirror assembly, said support arm comprising: a holder base adapted for attaching to the vehicle; a base key shaft fixed to said holder base; a holder pivotally carried on said holder base, and wherein said base key shaft extends into a retainer opening of said holder; a bushing carried in said retainer opening engaging a bearing surface of said retainer opening for controlling pivotal movement of said holder, wherein said bearing surface comprises a holder key protruding from an inner wall surface of said retainer opening, and wherein a bushing keyway is included in said bushing receiving said holder key to resist sliding of said bushing on said inner wall surface; a retainer carried in said retainer opening having a keyway receiving said base key shaft to resist rotation of said retainer about said base key shaft, and wherein said retainer is coupled to said base key shaft to retain said bushing in said retainer opening; a tapered retainer flange extending laterally from said retainer and cooperating with said bushing in sliding engagement to direct said bushing against said bearing surface; and, a compression spring carried in said retainer opening biasing said bushing against said tapered retainer flange so that said bushing is coupled into sliding engagement with said tapered retainer flange and directed laterally against said bearing surface to resist rotation of said holder about said retainer and base key shaft on said holder base.