Vehicular exterior mirror with actuator

A vehicular exterior rearview mirror assembly, said vehicular exterior rearview mirror assembly comprising:

• a mirror head movably attached at a mounting base configured for mounting at a side of a vehicle equipped with said vehicular exterior rearview mirror assembly, wherein said mirror head comprises a mirror casing and a mirror reflective element;
• an actuator electrically operable to move said mirror head relative to said mounting base, wherein, with said mounting base mounted at the side of the vehicle, said actuator, when electrically operated, moves said mirror head between at least an extended position, where the mirror head is extended outward from the side of the vehicle so that the mirror reflective element is positioned to provide a rearward view at the side of the vehicle to a driver of the vehicle, and a folded position, where the mirror head is moved inward from the extended position toward the side of the vehicle;
• wherein said actuator comprises (i) a base portion fixed relative to said mounting base, said base portion having an upper detent surface at a lower end region of said base portion and a post extending from the lower end region, (ii) an output gear having an upper detent surface and a lower detent surface, (iii) an attaching portion attached at said mirror head and having an upper detent surface and a lower detent surface, (iv) an upper detent element, and (v) a biasing element disposed between said upper detent element and an upper end of said post, the biasing element biasing said upper detent element away from the upper end of said post;
• wherein said actuator comprises an electrically powered motor that is electrically operable to move said attaching portion relative to said base portion;
• wherein, when said electrically powered motor is electrically powered to move said mirror head between the folded position and the extended position, said electrically powered motor moves relative to said base portion and the lower detent surface of said attaching portion moves relative to the upper detent surface of said base portion, and wherein, as the lower detent surface of said attaching portion moves relative to the upper detent surface of said base portion, said attaching portion moves axially away from said base portion to move said mirror head relative to said mounting base;
• and
• wherein, as the lower detent surface of said attaching portion moves relative to the upper detent surface of said base portion, the upper detent surface of said attaching portion moves relative to the lower detent surface of said output gear, such that said attaching portion is axially moved away from said base portion and said output gear is not axially moved with said attaching portion.