Thursday, February 7, 2008




Girish Abhyankar, Phone: 98605 47471
50, Swaroop Park, Near Gandhi Bhavan,
Kothrud, Pune-411 038

Ploughing requires one of the largest hauling forces in agricultural operations, much beyond the human capacity. Hence, animal or fuel power is used for the same.

I have devised an operator-propelled “GIRISH TRACTOR” by which farmer can plough alone with no heavy physical efforts (drudgery) on his part.

CONSTRUCTION:(REFER TO FIGURE): A pair of Wheels, 900 mm in diameter, is joined by 10 driver-rungs (angles running horizontally between the two wheels welded on the outer side of the wheel rims) forming the width of the tractor of minimum 700 mm.
Wheels are mounted on the axle with flange type self-aligning ball bearings.

PRINCIPLE OF OPERATION: GIRISH tractor converts vertical acting operator’s self-weight force into a horizontal acting hauling force large enough for ploughing.

Operator stands on the rungs and his own weight forces the wheels to rotational motion. Traction is achieved since the rung at the lowest position bites into the soil. Maximum force, almost equal to weight of the operator, is exerted when the operator stands on the rung in the horizontal plane. When transferred to the ploughing tool through a trailing frame, this force is sufficient for hauling operations like ploughing. Operator’s effort is like climbing a ladder, an action most natural, and strains no particular muscle.

1. Trailer wheel is lifted from the ground and locked to a height such that desired ploughing depth is reached. (Ploughing depth depends on the soil condition and self-weight of the operator). Operator stands on the other side and tugs/pulls a rung as shown. The tine plunges into soil as the tractor rolls until the normal hand pull is unable to move the tractor further.
2. One foot is then pushed against the appropriate rung. Further movement of the tractor depends on the foot pressure, soil, and the depth of the tine.

3. If no movement occurs, the operator climbs up the next rung. Tractor rolls onto him and he climbs on the next descending rung. Tractor continues to move backwards from the operator’s viewpoint.
4. In case the tractor is stuck due to heavy load, operator leans backward so that much of the body weight is taken away from the axle helps overcome the heavy load. If this happens more frequently lowering the trailer wheel will reduce the tine depth, decreasing the drag.

With little bit of practice, all the four stages of operation are performed in a smooth natural sequence.

Since the tine is constantly visible to the operator, root-clogs, large stones or clod, hollows and porous soil can be managed intelligently.

Various other implements like spades and ploughs can also be used.

For idle movement or reversing, the tool is lifted above the ground level and trailer wheel lowered for rolling support.

6 meter per minute ploughing is possible for a normal operator weighing 60 kg and expending 60 watts of power.

SAFETY: Though ergonomically designed, it is recommended that one uses proper shoes, hand gloves and leg pads. Canopy for shelter is also possible.

ADVANTAGES: “Girish Tractor” proves to be very useful to small land holders or in hilly terrain for the following reasons:

-Low initial cost due to simple and light-weight construction,
-Easy manoeuverability due to small size, reaching corners and boundaries; increased width eliminates possibility of overturning.
-Little maintenance and long-life.


Independent Researcher of ‘Soft Technologies’

1973 B.E.(Mechanical) Program from Pune University
1975 M.B.A. Program from Pune University

Experience Overview:
1] Service:
1975-1981: 5½ years as mechanical engineer in production & prototype shops
2] Self-Employed:
1981-1984: As a proprietor & partner for 2½ years.
1984-2003: As chairman & managing director (CEO) of a private limited company for 19½ years. Company engaged in Sales, Marketing, Servicing and Projects in the following Fields-
• Electronic components & subsystems.
• Test & Measuring instruments.
• Diagnostic medical equipment.
• Process Control Instruments.

Areas of Interest and Expertise:
Mr. Abhyankar took voluntary retirement from his own business in 2003 to pursue studies in ENERGY and Development of Soft Technology for Living Applications. He has successfully developed models of self reliant technologies for environmentally better and comfortable life style in rurban settings. The use of bio-power (muscle power) and ergonomically designed tools and equipments is his speciality. So far, he has to his credit successful design and development of self powerd ergonomic gadgetry and systems for maximum comforts in minimum efforts. Almost every activity is finally aimed at satisfying personal needs; why not satisfy them directly by obvious methods.
It includes-
• Perennial drinking and wash water supply
• Self powered kitchen machines (Dry and wet grinders)
• Ergonomic methods of cloth and utensils washing
• Powering illumination and laptop
• Self powered tractor
• Mobile Shelter