| 摘要 |
<p>A crank member (34) is pivotally supported on a connecting axis (β1), a horizontal fulcrum (β6) of the crank member (34) is connected to a portion (β8) of a rack (18) through a longitudinal sub-link (37), and a vertical fulcrum (β7) of the crank member (34) is connected to a portion (β9) of a forward end link (27) through a lateral sub-link (38), whereby the forward end link (27) for supporting an optical instrument (33) for medical use is constantly held in a substantially vertical state. Accordingly, there is no possibility of hitting a person due to a large swing of the forward end link (27), so that the optical instrument provides suitable operability and sanitary feature.</p> |
