| 摘要 |
<p>PURPOSE:To enable the extraction of the body if a device fails by coupling an expansion arm of a widening device fixing the body to a hole wall with a ball joint and, at the same time, closing the front end of the arm with the expansion of the arm. CONSTITUTION:A widening device 3 consisting of an expansion arm 4 equipped with a motor 9 is provided to a probe body 1, the motor 9 is driven, the device 3 is widened, and the 1 is fixed to a hole wall. A ball 14 is loaded between an coupling arm 13 and an external cylinder 15 and, at the same time, a stay 6 is pivoted, and the expandable arm 4 is formed. In addition, when the expansion arm 4 is expanded, the front end of the stay 6 is closed. If the motor 9 fails, a rope 2 is pulled up. According to the constitution, a tension state of the arm 4 is automatically released, and the extraction can easily be carried out.</p> |
