Farm Power And Machinery (1+1)

Spike tooth harrow

• It is a harrow with peg shaped teeth of diamond cross section to a rectangular frame.
• It is used to break the clod, stir the soil, uproot the weeds, level the ground, break the soil and cover the seeds.
• Its principle is to smoothen and level the soil directly after ploughing. Spike tooth harrows may be of rigid type and flexible type.
• The animal drawn spike tooth harrow is usually of rigid type.
• These may or may not have provisions for changing the angle of spikes in operating conditions.
• Tractor drawn harrows are usually flexible type (Fig.14.5). It has got the advantage of being turned up for transporting purpose.
• This harrow mainly consists of teeth, tooth bar frame, clamps, guard, braces, levers and hooks.
• The teeth are made up of hardened steel with square/triangular/circular in section.
• The teeth are so placed on tooth bar that no tooth is directly behind the other. Teeth are fastened rigidly to the tooth bar.
• Clamps are rigidly fixed so as not to be loose while in operation.


Fig. 14.5 line diagram of Spike tooth harrow