| 摘要 |
A spindle is axially displaceable toward and away from an opening in a housing in which it is located. The spindle end portion facing the opening is concentrically surrounded by jaws having cam faces which are in permanent biased contact with the end portion or with a side member carried by the same. The jaws have surfaces which are located beneath and extend across the opening when the spindle is in one end position. As the spindle moves towards its other end position, the jaws are progressively deflected outwardly away from the spindle axis so that their surfaces, visible through the housing opening, also progressively recede transversely of the opening, thus providing a visual indication of the spindle position.
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