| 摘要 |
A remotely controlled rearview mirror tilting device comprises two identical mechanisms, mounted within a housing, for converting the bidirectional rotation of motor-driven worms into rectilinear reciprocation of plungers in order to tilt a mirror holder relative to the housing about two orthogonal axes. Each rotary-to-linear converter mechanism comprises a hollow rotor integral with a worm wheel in mesh with one of the worms. The hollow rotor has an open end rotatably fitted in an opening in the housing and thereby restrained from axial displacement in one direction. For improved rainproofness and reduced frictional resistance the other end of the hollow rotor is closed and makes point contact with the housing via conical boss on either of the rotor and the housing. One of the plungers is mounted in the hollow rotor for simultaneous rotation therewith and for sliding motion in its axial direction. Projecting out of the open end of the rotor, one end of the plunger is coupled to the mirror holder via a ball-and-socket joint. The plunger is screw threaded and slidably engaged by a wire spring anchored to the housing, so that the bidirectional rotation of the rotor results in the rectilinear reciprocation of the plunger. An alternative embodiment is disclosed.
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