An Etymological Dictionary of the German Language/Kloben
Kloben, m., ‘log of wood, block, pulley,’ from MidHG. klobe, m., ‘log of wood with a slit to act as a vice, fetter, stick with a slit for catching birds, bolt, slit,’ &c.; OHG. chlobo, m., ‘stick for catching birds’; allied to klieben, MidHG. klieben, vb., ‘to split, cleave’ (comp. Bogen, allied to biegen). OLG. kloðo, m., ‘fetter’; OIc. klofe, m., ‘crevice in a rock, door joint’; Du. kloof, f., ‘slit, rift, cleft.’ Comp. Knoblauch.