This invention involves in a kind of campstools used for leisure life in camping, field tours, at a courtyard, a garden and so like. The blades provide a plurality of cutting elements or teeth arranged on a leading face of the blade. In addition, the azimuth is also indicated by an angle departing from a north direction of the map information. Three clutches are provided between the second coupling and input member, third coupling and input member, and seventh rotary element and input member. The cam-actuating mechanism can be employed with a manual override mechanism to manually control locking and release of the clutch members as well as utilizing a torque limiter to absorb shock loads without unduly increasing the size of the clutch so that it will readily fit into the space occupied by existing or standard clutch mechanisms.