| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact turning position detection mechanism of a working bench capable of achieving maintenance work at low cost and increasing its reliability for a long time. SOLUTION: This turning position detection mechanism 50 is provided with a swing supporting member 6 in which swing of a vertical post part 6a at an upper end is controlled so as to hold vertical attitude always irrespective of a derricking angle of a boom 5 in a tip part of the boom 5 arranged so as to derrick and move for a vehicle body freely, the working bench 8 turnably supported through a working bench bracket 7 connected pivotally with the vertical post part 6a, and a rotation position detection means composed of a detection switch and a dog for detecting a rotation angle position of the working bench bracket 7 for the vertical post part 6a. The rotation position detection means is arranged in a top surface region of a cylindrical part 7a of the working bench bracket in a pivotal connection part of the vertical post part and the working bench bracket 7. COPYRIGHT: (C)2007,JPO&INPIT
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