| 摘要 |
<p>An external rear-view mirror assembly comprises a pair of caliper-like clamping arms (10, 12) articulated to each other and a mirror-mounting stem (50) which projects from the articulation joint of the arms. The two arms (10, 12) are retained in an articulated condition by releasable retention means (102, 98). Each arm (10, 12) has a respective radial wall (78, 80) at its end (74, 76) which articulates with the other arm. At least one of the walls has a circular array of notches (114, 116) concentric with the articulation axis (X-X) and the other wall has at least one corresponding notch. The arms (10, 12) are biassed towards each other by a helical torsion spring (108) which is coaxial with the articulation axis (X-X), and is interposed between the radial walls (78, 80) in such a way that a respective outwardly facing axially projecting end (110, 112) of the spring engages a notch of the adjacent radial wall (78, 80). Release of the retention means (98, 102) enables the disengagement of the projecting ends (110, 112) of the spring (108) from the notches (114, 116) and their subsequent engagement in other notches to vary the angle between the arms (10, 12) corresponding to the relaxation condition of the spring (108).</p> |
