| 摘要 |
PROBLEM TO BE SOLVED: To surely lock an installation pin for an attachment engaged with an engagement groove of an attachment/detachment device and to allow an operator to recognize that the installation pin is in a retained state of the lock attitude in an installation pin retainment confirmation device for attaching/ detaching a working machine attachment. SOLUTION: This installation pin retainment confirmation device is provided with a latch 24 displaceable in a lock attitude preventing the falling-off of the installation pin 34, which is fitted in the engagement groove 242 provided in the attachment/detachment device, and a lock piston 15 displaceable in a lock attitude R locking the latch 24 in the lock attitude and a lock release attitude Q releasing the lock of the latch. When there is some failure in the operation of the latch 24 or the lock piston 15, a lock state confirmation device 70 is provided in such a place that the operator can confirm its states so that the operator can perform the work while confirming the satisfactory lock attitude R of the installation pin 34 and the engagement groove 242.
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