605036 A movement transfer mechanism is disclosed for a portable power tool (1), in particular for converting rotary motion to oscillatory motion in a cow tail trimmer. The mechanism includes a movement transfer block (10), a shaft (13) linked to a driving means and a linking arm (7) linked to the working element (4). The movement transfer block (10) includes a first sliding aperture (12) for receiving an eccentric pin (15) at the head of the shaft and a second sliding aperture (11) in line with the linking arm (7). The first (12) and second (11) apertures are perpendicular to each other.
