Patent ID: 11951653
Assignee: DAESUNGGT CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A core drill having a one touch lock function of a core bit, the core drill comprising:
a polygonal-shaped connection protrusion (11) coupled with one side of the core bit (3);
a decelerating connector (10) extending from the polygonal-shaped connection protrusion (11);
a plurality of locking grooves (12) formed on an outer periphery of the decelerating connector (10);
a decelerating unit (4);
a lock housing (20) integrally fitted to an outside of a spindle (4a) which is exposed outside the decelerating unit (4), and formed with a pin hole (21) penetrating from an outer peripheral side of the lock housing (20) to another outer peripheral side of the lock housing (20), and
a lock pin (30) inside the pin hole (21) with a spring (50) interposed between the lock pin (30) and the pin hole (21), and fitted into a locking groove (12) of the decelerating connector (10), the decelerating connector (10) being configured to be fit into a polygonal-shaped connection hole (4b) formed on the spindle (4a), so as to maintain locking of the core bit (3) and the decelerating unit (4) automatically, wherein
the lock pin (30) comprises a guide part (32) having a press protrusion (31) formed thereon, a trapped part (33) and a locking part (34), a width of the locking part (34) being greater than a width of the trapped part (33), and
the guide part (32) penetrates a spring holder (40) installed on a linear end of the pin hole (21), and fitted into the pin hole (21), and
the trapped part (33) is caught by the spring holder (40) and prevents the lock pin (30) from being separated from the lock housing (20), and the spring (50) is installed between the trapped part (33) and the press protrusion (31).