| 摘要 |
PROBLEM TO BE SOLVED: To provide an interference prevention device capable of easily preventing the interference of a working platform with a body mounted object at a low cost in a vehicle for high lift work having an arm with a wide extendable angle at the tip of a boom. SOLUTION: A leveling link 6 always holding a boom at a constant attitude is pivotally connected to the tip part of an elevating boom 5a irrespective of the elevating angle of the boom, and an arm 7 is elevatingly pivoted to the tip of the leveling link 6 through an arm pivot pin 41. A cam member 60 comprising a cylindrical part 61 around the axis of the arm pivot pin 41 and a flat surface part 62 bent inward is fitted to the base part of the arm 7. A detection switch 70 for detecting the cam member in contact with cam surfaces 61 and 62 is fitted to the tip part of the boom. The cam member 60 is formed so as to come into contact with the detecting element 72 of the detection switch when the elevating angle of the boom 5 is equal to or below a specified angle and the elevating angle of the boom 7 is equal to or below a specified angle for an alarm operation on the basis of the detection signal.
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