16 on three sides side plates or covers 40 and 42 are attached to support frame 26 on both sides of the apparatus providing protection against brush or other materials being caught in the chain or sprockets a pair of plates or flat bars are attached to the inside surface of both side plates 40 and 42 as seen in fig5 upper and lower bars 44 and 46 respectively converge gradually from one end adjacent sprocket 24 to a parallel position defining inwardly facing channels extending along both sides of the lower run of chain travel these channels are dimensioned and arranged to receive both ends of pins 16 as best shown in fig4 along substantially the entire lower run by thus confining the pins any significant amount of twisting motion of the chain and elements mounted thereon which might be produced as brush or other materials are dragged along by tines 12 is prevented the rake apparatus thus far described is attached to tractor 10 for movement relative thereto about a plurality of axes such motion is produced by extensible and retractable cylinders powered by the tractor hydraulic system the rake is attached to the usual 3 point hitch cylinder 48 being attached to the upper point for raising and lowering the entire apparatus about axis 50 through the two lower pivot points as indicated in fig8.