| 摘要 |
An advance and retreat assist tool (100) includes a base unit (300), a fixing unit (400), a first tubular member (500) and a fixing portion (600). The advance and retreat assist tool (100) further includes a rotary portion (700) and an advance and retreat mechanism (800). The advance and retreat assist tool (100) further includes a hinge mechanism (970) which switches to either a coaxial condition or a slanted condition and fixes the slanted condition when the hinge mechanism (970) has switched to the slanted condition. |
