| 摘要 |
PROBLEM TO BE SOLVED: To provide a support arm locking device of a lift device to surely lock a support arm. SOLUTION: This expandable support arm locking devices 5 which are arm locking means are turnably and pivotably connected to intermediate portions of a pair of support arms 4 pivotably supported by an arm holder 3 outside a flit plate 2 and the arm holder 3 at end parts.
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