OPERATION CONFIRMATION DEVICE FOR MOVABLE DRILLING BLADE AND ENLARGED DRILLING DEVICE INCLUDING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an operation confirmation device for a reusable movable drilling blade and an enlarged drilling device including the same.;SOLUTION: An operation confirmation device of a movable drilling blade applied to a drilling drill having a movable drilling blade and drilling the ground comprises a pedestal having a shaft hole, a pin having a shaft reciprocably inserted in the shaft hole, and which displaces from an initial position to an actuated position when the movable drilling blade performs a predetermined actuation, and holding means for holding the pin in the actuated position when the pin is displaced from the initial position to the actuated position.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2019,JPO&INPIT