| 摘要 |
PURPOSE:To enable sure pull-out of an endoscope without failure in the pull-out in the mid-way by constituting the endoscope in such a way that a guiding member for insertion is freely oscillatably supported to a link and is energized outward while said member is kept inclined forward. CONSTITUTION:As a device 11 advances toward an arrow B, an obstacle collides against a wheel 14 from behind said device and exerts force on said wheel. Even if the wheel 14 receives the force in any position in the range of a height h2 from the inside wall surface of a pipeline 40 up to the outside circumferential surface of a link supporting part 19 in this stage, a main link 21 turns in the direction where the inclination thereof falls and therefore the wheel 14 can easily ride over the obstacle having the step up to the height h2. The relation between the height h2 of the step over which the auxiliary device 11 for insertion can ride when said device advances toward the arrow B and the height h1 of the step over which the device can ride when said device advances toward the arrow A is h2>h1 and therefore the wheel 14 is capable of riding over the obstacle having the step over which the wheel can ride when the device 11 is moved to be inserted toward the arrow A without fail in the stage of drawing out the device toward the arrow B. |
