| 摘要 |
PROBLEM TO BE SOLVED: To save the labor and the time by adding a structure of automatically performing attachment/detachment to a coupling structure to attach/detach a plug bar to a traveling track. SOLUTION: A circumferential groove 101 is formed in an outer circumference in the vicinity of a tail end of a plug bar 100, four claws 20 to be attached/ detached to/from the circumferential groove 101 are fitted to the traveling truck 10 side, and a rod 30 to tilt these claws 20. The rod 30 is moved in the longitudinal direction by a screw 35 and gears 41 and 45 to automatically attach/detach the plug bar 100. COPYRIGHT: (C)2003,JPO
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