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A flyswatter is a hand-held device for killing flies and other insects. A flyswatter usually consists of a small rectangular sheet (about 4 inches or 10 cm across) of lightweight, flexible, vented material, usually thin metallic, rubber, or plastic mesh, attached to a lightweight wire or plastic handle about 2 feet (0.61 m) long. The venting reduces wind drag, making it easier to hit a fast-moving target such as a fly.

The abeyance of insects through short horsetail staffs and fans is ancient. The patent on fly swatter was issued in 1900 to Robert R. Montgomery who called it a fly-killer. [1] Montgomery sold his patent to John L. Bennett, a wealthy inventor and an industrialist who made further improvements on the design. [2]
The origin of the name 'fly swatter' comes however not from its inventors.In the summer of 1905, Kansas was plagued by an overabundance of flies, which, as well as causing annoyance, aided in the spread of disease. Dr. Samuel Crumbine, a member of the Kansas board of health, wanted to raise public awareness of the threat of flies. He was inspired by a chant at a local Topeka softball game: "swat the ball". In a health bulletin published soon afterwards, he exhorted Kansans to "swat the fly".

In response, a schoolteacher named Frank H. Rose created the "fly bat", a device consisting of a yardstick attached to a piece of screen. Crumbine invented the device now commonly known as the fly swatter

Electric flyswatters, hand held devices that resemble tennis rackets, became popular worldwide in 2005.[citation needed]. US Patent 5,519,963 was awarded to Taiwanese inventor Tsao-i Shih in 1996 for such a device[3]. The handle contains batteries and a charging mechanism that generates a high voltage. The electronic circuit is composed of an oscillator, a step-up transformer and a voltage multiplier[4].

The grid of the flyswatter is electrically charged to a voltage of between 1000 and 2500 V DC by pushing a button. When the electrically conducting body of a fly nearly bridges the gap, the spark jumps over, through the fly. A capacitor between the electrodes discharges during the spark. This initial discharge usually stuns the fly. If pressing the button is continued, the continuous current will roast and kill the fly.

Most flyswatters conform to electrical safety standards for humans:

a limit on the charge stored in the capacitor. A discharge of less than 45 µC is considered safe, even in the unlikely scenario that the current from a flyswatter would be flowing from one arm to the other arm, partly through the heart.[5] This means that the capacitor of a 1000 V flyswatter should be less than 45 nF. Due to this precaution for humans the initial shock is usually inadequate to kill flies.
a limit on the current after the initial discharge. The maximal continuous current of most flyswatters is less than 5 mA. This current is safe, even when flowing from one arm to the other arm.[6]

Many flyswatters have a three layer grid to prevent people from touching both electrodes.

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SUMBER :http://en.wikipedia.org/wiki/Flyswatter , GOOGLE