| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily detect metal bed material with a simple structure, by forming an accommodating chamber in a cap or the like which chamber accommodates movably a magnet, by using material capable of seeing the magnet. SOLUTION: A magnet 25 is movably accommodated in an accommodating chamber formed in a hand grip 1 or a cap 20 of a bed material detector, and the chamber is formed of material capable of seeing the magnet 25, so that the existing portion of the metal bed material can be recognized from the movement of the magnet 25. That is, a tip cylinder 20b of the cap 20 is formed of transparent resin or the like in order that the movement of the inside magnet 25 may be recognized. A thin cylinder type magnet 25 is accommodated in the tip cylinder 20b, which is moved being in contact with a wall. When bed material arranged on the rear of the wall is metal, the magnet 25 reacts and is attracted to a top of the tip cylinder 20b. When bed material is not metal, the magnet 25 slants. The existing portion of bed material (metal) can be easily recognized from the movement of the magnet 25.</p> |
