An ergonomic study to match anthropometric dimensions of tractor operators with their seat in occupational condition of tea plantations in north-east India

An ergonomic study to match anthropometric dimensions of tractor operators with their seat was carried out during 2010–12 on tea plantations, located in Lakhimpur and Sonitpur districts of Assam. A seat bearing maximum body weight (75 kg) of driver, absorbing shocks, jerks, jumps, etc. of rooty and stony undulating field was essentially required. Occupational environment having poor visibility during rainy season needed tractor operator of higher standing height. Keeping in view poor visibility due to rain and presence of shade trees and requirements of fields, comfortable height, width, depth and elbow rest height were found as 39 cm with 8 cm vertical adjustment, 36 cm with 5 cm each left and right side adjustment, 40 cm with 5 cm each forward and rearward adjustment (3/4 of their thigh length) and 23 cm with 10 cm adjustment in vertical plane, respectively. Concave back rest with little rearward inclination, concave seat pan sloping back side, 5 cm thick seat cushion and water proof hood fitted with sunshade were also needed for their comfort, safety and efficiency.