| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage to workbenches and telescopic booms resulting from overpressure upon the workbenches by storing the workbenches in a state ensuring the effect of workbench receives. SOLUTION: Over a car body 5, a vertically telescopic workbench receiver 21 is disposed to support a workbench 17 that is seated on it. The workbench receiver 21 has a projection member 25 projecting up from the vehicle body 5 and a vertically movable member 27 movable along the projection member 25, both which members are connected via dampers 29. The movable member 27 has at its bottom an abutment 27c projecting out. Outside the projection member 25 and under the abutment 27c, a workbench housing detection sensor 33 detects any storage of the workbench 17 via its own contact with the abutment 27c, and an overpressure sensor 35 detects any overpressure the workbench 17 applies to the workbench receiver 21.
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