Abstract: An inventive punching unit is provided with punches (2) whose blade (2a) is cut away in a shape of V at a shearing angle (a) whose apex (b) is set at a position offset from an axial center line (O-O) of the punch (2) by a predetermined distance (c). Because the lengths of left and right edges (P3 and P4) of the blade (2a) are different and these edges (P3 and P4) contact with a sheet at staggered timing, a peak value of punching force of the punch (2) may be lowered. Thus, the peak values of the punch are lowered and hence a driving force is lowered.

Abstract: The self-propelled stairs moving unit A1 moves on stairs, putting a manual wheelchair K on the pallet 7, by driving the front crawler traveling units 1a, 1b and the rear crawler traveling units 2a, 2b wherein right and left are unitedly connected with each other. When the stairs moving unit A1 is started to go up to the stairs from the flat face of lower hand, the front crawler traveling unit 1a relatively gently goes up. Then, the angle between the pallet 7 to be held to be level with the connecting shaft 6 which is rotation center of the traveling unit 1a as its center of oscillation and the line connecting both connecting portions of the support frames 5a connecting the front and rear crawler traveling units 1a, 2a (that is, the self-propelled portion) is slowly changed.