Patent attributes
The spike wheels of the harrow are arranged in gangs to rotate about a common axis during ground engagement. Each wheel has a plurality of spikes that project outwardly from a cylindrical hub having a pair of opposite ends. Projections at one end of the hub are matingly received within notches in the opposite end of the hub of the next adjacent wheel so that the wheels are interlocked for rotation in unison. The projections on each hub are offset angularly from the notches by a certain amount so that adjacent wheels are correspondingly rotatively offset from one another. The outermost tips of the spikes of each wheel are inturned to a certain extent so as to render each wheel generally concavo-convex, with the concave sides of the wheels leading as the machine is pulled through the field. Front gangs of the wheels are disposed in a certain oblique attitude with respect to the path of travel of the machine, while rear gangs are disposed in opposite oblique attitudes.
