Abstract: There is disclosed a mechanically powered tool comprising a crimping device capable of shearing tines out of an angle-bar used for protecting a corner formed by two wall panels and driving the tines into the panels for fixing the angle-bar thereto; the crimping device including a rectilinearly reciprocable actuating rod movable in a working stroke. Operatively connected to one end of the actuating rod to displace it in its working stroke is a follower block of a movement-transforming device, which block is made to be displaced in a rectilinearly reciprocable motion; the transforming device further having a rotary input section. Connected to the latter is a rotary shaft of a single-revolution clutch which further has a rotary input section operatively connected for its rotation, to a rotary output member of a power assembly.