Abstract: Provided is a core drill having one touch lock function of a core bit, and particularly, new-conceptional technology of maintaining locking automatically during assembling a core bit and a decelerating unit, and releasing the locking easily, and the core drill conventionally disclosed had problems that movement and separation of the core bit and the decelerating unit of the core drill often occur during operation, because there is no specific lock function in the state that the core bit and the decelerating unit are assembled, and in this disclosure of the present invention to solve the problems, there is provided new technology for automatically maintaining locking if releasing the locking after inserting a decelerating connector coupled to a core bit into a connection hole formed in a spindle in the state of releasing the locking by pressing the lock pin elastically installed in a lock housing fittingly installed outside the spindle.

Abstract: Provided is a core drill having one touch lock function of a core bit, and particularly, new-conceptional technology of maintaining locking automatically during assembling a core bit and a decelerating unit, and releasing the locking easily, and the core drill conventionally disclosed had problems that movement and separation of the core bit and the decelerating unit of the core drill often occur during operation, because there is no specific lock function in the state that the core bit and the decelerating unit are assembled, and in this disclosure of the present invention to solve the problems, there is provided new technology for automatically maintaining locking if releasing the locking after inserting a decelerating connector coupled to a core bit into a connection hole formed in a spindle in the state of releasing the locking by pressing the lock pin elastically installed in a lock housing fittingly installed outside the spindle.