Cutting tools having movable cover mounting structures

A cutting tool comprising:

• a tool unit having a rotary cutting blade;
• a movable cover configured to cover the rotary cutting blade;
• a rotary support member mounted to the tool unit and rotatably supporting the movable cover about a rotational axis, and
• an intermediate member interposed between the rotary support member and the movable cover, wherein:
• the rotary support member has a first contact surface;
• the movable cover has a second contact surface;
• the intermediate member has a third contact surface and a fourth contact surface slidably contacting the first contact surface and the second contact surface, respectively, so that the first contact surface and the third contact surface slide relative to each other in a circumferential direction about the rotational axis and/or the second contact surface and the fourth contact surface slide relative to each other in the circumferential direction as the movable cover rotates relative to the rotary support member;
• and
• at least one of the first, second, third and fourth surfaces has a groove formed therein.