| 摘要 |
The present invention comprises: a body connected to an arm of an excavator; a driving hook installed to be rotated in the body, wherein a rotational axis of a bucket is coupled; a first hydraulic cylinder installed in the body for the driving hook to be rotated; a safety pin equipped in the body to appear toward the driving hook; a second hydraulic cylinder moving the safety pin as a rod appears by a working fluid supplied from the first hydraulic cylinder; and a hydraulic valve supplying a working fluid to the second hydraulic cylinder for the safety pin to be moved to the driving hook when the working fluid is filled over predetermined pressure inside the first hydraulic cylinder. |
