Lawn mower

       January 1, 0000    1170

 

The lawn mower is a mechanical tool or device that exactly shaves the surface of the grass by using rapidly rotating blades. Form years grass used to be cut by workers who walked through fields wielding small, sharp scythes. It was a tiring and slow, manual cutting process and was ineffective as the scythes worked well only when the grass was wet. The first mechanical grass-cutting machine appeared in 1830, when an English textile worker named Edwin Budding made a mower supposedly based on a textile machine used to shear the doze off of cloth. Cylindrical mower was attached to a rear roller that propelled it with a chain drive and it shaved grass with a curved cutting edge attached to its cylinder. It has two sizes, large and small. The large mower had to be drawn by horses. Their hooves were temporarily shod with rubber boots to prevent them from damaging the turf. The smaller mower to countrymen, who would claim this machine an amusing, useful and healthful exercise.
Easy and time saving
Mechanized grass cutting was obviously slow to catch on, because mower was quite heavy in addition to being inefficiently geared. Weighing is considerably less than their predecessors and based on the side-wheel design still used in today's most popular mowers, these refined machines were soon visible in yards throughout the world.
Types of mowers
Power mowers are presently available in four basic designs they are the rotary mower, the power reel mower, the riding mower and the tractor. The rotary mower is the most common, it is the focus of this entry. Rotary mowers feature a single rotating blade enclosed in a case and supported by wheels. As the engine turns, it starts spinning the blade. The blade whirls at 3,000 revolutions per minute, virtually 19,000 feet per minute at the tip of the blade where the cutting actually occurs. The best rotaries feature a horn of plenty or wind tunnel shape curving around the front of the housing and ending at the discharge tube through which the mown grass comes out. Self-propelled models are driven by a chain or belt connected to the engine's drive pipe. A gearbox usually turns a horizontal axle that in turn rotates the wheels. Some models have a big chain or belt-driven movable unit that rises up off and settles down on the wheels.

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