2016年5月20日 星期五

bungee, bungee cord, Bungee jumping 1979

"There is a bungee cord tied around my waist, and it tethers me to Ground Zero. The bungee lets me move away, to live a happy life, but it always, always, at any given moment in time, at any moment, that bungee can pull me back. It doesn’t let me forget for one single second that my existence has been forever changed."

A bill that just passed in the Senate would allow relatives of 9/11 victims to…
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 bungee 1930s


From Wikipedia, the free encyclopedia
Bungee cords equipped with metal hooks
A child on a bungee cord device in Moscow, Russia
bungee cord (sometimes spelled bungie), also known as a shock cord, (Occy strap / Octopus strap in Australian common usage) is an elastic cord composed of one or more elastic strands forming a core, usually covered in a woven cotton or polypropylene sheath. The sheath does not materially extend elastically, but it is braided with its strands spiraling around the core so that a longitudinal pull causes it to squeeze the core, transmitting the core's elastic compression to the longitudinal extension of the sheath and cord. Specialized bungees, such as some used in bungee jumping, may be made entirely of elastic strands.[citation needed]
Bungee cords have been used to provide a lightweight suspension for aircraft undercarriages from before World War I, and are still used on many small homebuilt aircraft where weight remains critical.[1] Bungee cords were also used in parachuting to assist in opening the old-style parachute container after the ripcord was pulled.[citation needed]
Today, bungee cords are most often used to secure objects without tying knots and to absorb shock. Inexpensive bungee cords, with metal or plastic hooks on each end, are marketed as a general utility item. This form is also known as kangaroo, octopus, or "occy", straps in Australia. These can be an individual strap, or a set of four hooked straps held together by a metal ring allowing the occy strap to secure items around various tie points, for example a suitcase to a car roof rack. Extensions of the concept are available as a coarse net of bungee cords with metal or plastic hooks around the periphery, for securing irregularly shaped loads of luggage and cargo on the backs of pickup trucks, roofs of cars, and so on.[citation needed]
Bungee cords have also been used to make bungee chairs[2] and for other purposes.
The origin of the name "bungee", bungie" or "bungy" is uncertain. The Oxford English Dictionary records the use in 1938 of the phrase bungee-launching of gliders using an elasticized cord.[3]



Bungee jumping off the Victoria Falls Bridge in Zambia/Zimbabwe
Bungee jumping 1979
Bungee jumping (/ˈbʌndʒiː/; also spelt "Bungy" jumping, which is the usual spelling in New Zealand and several other countries)[1][2] is an activity that involves jumping from a tall structure while connected to a large elastic cord. The tall structure is usually a fixed object, such as a building, bridge or crane; but it is also possible to jump from a movable object, such as a hot-air-balloon or helicopter, that has the ability to hover above the ground. The thrill comes from the free-falling and the rebound.[3] When the person jumps, the cord stretches and the jumper flies upwards again as the cord recoils, and continues to oscillate up and down until all the kinetic energy is dissipated.
Contents  [hide] 
1 History
1.1 The word "bungee"
1.2 Earlier tethered jumping
2 Equipment
3 The highest jump
4 Variations
4.1 Catapult
4.2 Trampoline
4.3 Running
4.4 Ramp
4.5 Suspended Catch Air Device
5 Safety and possible injury
6 In popular culture
7 References
8 External links


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