Farm Power And Machinery (1+1)

Spring tooth harrow

• It is a harrow with tough flexible teeth, suitable to work in hard and stony soils.
• Spring tooth harrow is fitted with springs having loops of elliptical shape as shown in Fig. 14.6.
• It gives a spring action in working condition. It is used in the soil when obstruction like stone, roots and weeds are hidden below the ground surface.
• This type pulverizes the soil and helps in killing weeds.
• This type of harrow mainly consists of teeth, tooth bar, clamps, frame, lever and links.
• Usually the teeth are made of spring steel.
• Sometimes reversible points are provided so that one end may be used after the other end is worn out.
• The teeth are fastened to the tooth bar by means of tooth clamps.
• They are provided to give rigidity and support to the harrow.
• The levers are provided for setting the teeth for varying the depth of harrowing.
• For light harrowing, the adjustment is done in slanting position.
• Draft hooks on each corner of every section for hitching purpose.


Fig. 14.6. Line diagram of spring tooth harrow