| 摘要 |
A crank member (34) is pivotally supported on a connecting axis ( beta 1), a horizontal fulcrum ( beta 6) of the crank member (34) is connected to a portion ( beta 8) of a rack (18) through a longitudinal sub-link (37), and a vertical fulcrum ( beta 7) of the crank member (34) is connected to a portion ( beta 9) 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. <IMAGE> |
