Extandable exterior rearview mirror assembly

The present invention relates to an extendable exterior rearview mirror assembly for mounting on a vehicle and, more particularly, to an exterior rearview mirror for mounting on a vehicle which can be selectively extended by the occupant of the vehicle to increase the field of view for example when the vehicle is used for towing a trailer, camper, another vehicle, or the like. An extendable exterior rearview mirror assembly includes a mirror subassembly, a bracket which is adapted for mounting to a vehicle, and a support which mounts the mirror subassembly to the bracket. Support extends into the housing which is movable along the support. The housing includes a retracted position and at lease one outboard position, which define a direction of extension. The mirror assembly further includes a drive assembly which is supported in the housing and drivingly coupled to the support. The drive assembly selectively moves the housing along the support. The mirror assembly further includes a clutch mechanism which drivingly decouples the drive assembly from the support when a force of sufficient magnitude is applied to the housing in the direction of extension such that the housing can be manually moved along the support.