| 摘要 |
PROBLEM TO BE SOLVED: To enable noncontact operation of an operating member of a boom lock device to improve the durability of the lock device in solving a problem of a friction caused by the operating member at left/right rotating parts of a boom bracket. SOLUTION: The lock device 51 locks a boom 16 of an excavator 3 to a main machine. An engaging member is disposed on one of the boom 16 and the boom bracket 15 at the main machine side, and an engaged member is disposed on the other of the same. The engaging member is made of a plate, and a hook 52a is formed one side of the engaging member while an oval hole 52c is formed on the other side of the same. The engaging member is supported by a support pin 55 inserted in the oval hole 52c of the engaging member and a stopper 53 located above the support pin 55. COPYRIGHT: (C)2007,JPO&INPIT
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