Power tool

A power tool, comprising:

• a hollow pole;
• a prime mover disposed at one end of the hollow pole;
• a tool disposed at a other end of the hollow pole;
• a transmission shaft disposed within the hollow pole in a rotatable manner and configured to transmit torque from the prime mover to the tool;
• a joint mechanism configured to support the tool such that the tool is capable of rotating with respect to the hollow pole;
• a lock mechanism configured to selectively lock and unlock the joint mechanism;
• and
• a clutch mechanism disposed on a pathway of torque transmission from the prime mover to the tool via the transmission shaft, and configured to selectively connect and disconnect the pathway of torque transmission, wherein
• the lock mechanism and the clutch mechanism are coupled with each other such that when the lock mechanism unlocks the joint mechanism the lock mechanism causes the clutch mechanism to disconnect the pathway of torque transmission.