| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the workability by opening/closing a long window hole provided in a small inner tube for transmission in which a coaxial cable is stored by elevating/lowering a long nut screwed to its outer circumference. SOLUTION: In an earth auger, etc., in which an inclinometer, etc., is stored in an excavation rod, a transmission tube comprises a small tube 31 to store a coaxial cable, a long window hole 32 from/to which a coaxial cable 20, and connectors 44, 51 of a cable 50 for charging a battery can be delivered, and a long nut 33. When instruments, batteries, etc., are replaced, a small inner tube for transmission containing the small tube 31 is removed from the excavation rod at a flange F part. Then, the long nut 33 is lowered, and a storage part is detached from the small tube 31, and upper and lower cables 20, 51 are detached at the connectors 44, 51 parts. The lower side cables 20, 51 are drawn downward of the small tube 31 together with the batteries or the like in the storage part, and the batteries, etc., are replaced and restored. When the batteries are charged, the long nut 33 is lowered, and a power source cable is connected to the connector 51 for charging.</p> |
