| 摘要 |
PROBLEM TO BE SOLVED: To prevent soil into a slide hole engaged with the operation arm of an expansion blade from being deposited and compacted in an expansion head. SOLUTION: A hydraulic cylinder is coaxially installed in the head rod of the expansion head for excavating operation, and the expansion blade having the operation arm extended from a blade base part in the opposite direction is pivotally supported on the outer peripheral part of the head rod so as to be expanded and contracted at the blade base part. Also, a slide piece is slidably engaged with a slide hole formed at the end part of a reciprocatingly driven cylinder so as to be passed therethrough in the vertical direction, and the tip part of the operation arm is rotatably connected to the slide piece. When the expansion blade is expanded and contracted by the reciprocating driving of the cylinder, the slide piece is reciprocatingly and slidably moved in the slide hole through the operation arm. COPYRIGHT: (C)2006,JPO&NCIPI
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