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A pogo stick is a device for jumping off the ground in a standing position, through the aid of a spring, or new high performance technologies, often used as a toy, exercise equipment, or extreme sports instrument.〔http://www.merriam-webster.com/dictionary/pogo%20stick〕 The pogo stick is currently undergoing a renaissance through its accelerated entry into the world of extreme sports via the new sport of extreme pogo or "Xpogo". It consists of a pole with a handle at the top and footrests near the bottom, and a spring located somewhere along the pole. The spring joins two sections of the pole, which extends below the footpads. The operator places his feet on the footpads while balancing on the pole, then jumps up or down with a bending action of the knees to add or subtract energy in the spring. When the spring is at full compression or extension, the operator is lifted by the recoil of the spring, being launched several inches or feet into the air. This process is repeated to maintain a periodic bounce. The pogo stick can be steered by shifting one's weight off the centerline of the spring in the desired horizontal direction thus producing horizontal locomotion. ==Inventors== A spring stilt utilizing compression springs on each foot was patented in 1891 〔( google.com/patents )〕 by George H. Herrington of Wichita, Kansas "for leaping great distances and heights". This was an antecedent of the pogo stick as well as today's spring stilts. The modern pogo stick was invented by Max Pohlig and Ernst Gottschall, from Germany. A German patent was registered in Hanover on March 1920 〔(depatisnet.dpma.de )〕 for a device they called a "spring end hopping stilt". It is thought that the beginning two letters in these men's last names is where the name pogo comes from. The two-handle pogo stick design was patented by George B. Hansburg〔(google.com/patents/ )〕 in 1957. Hansburg described the origins of the Pogo name colloquially in a story of a young Burmese girl with the aforementioned name whose father had created a crude version of the device so that the daughter could travel to the local temple for prayers.〔Goodson, M. & Todman, B. (Producers). (1959). What's My Line (series ). Manhattan, New York City: CBS Broadcast Center. (youtube.com ). Retrieved 2011-01-19.〕 An earlier design with a single upright vertical handle 〔(google.com/patents )〕 patented in 1955 posed something of a risk to the user's chin. Later improvements to the pogo stick have been made, including the Vurtego,〔(vurtegopogostick.com )〕 Flybar,〔(flybar.com )〕 BowGo,〔(The Bowgo Project )〕 and the Up Wing pogo stick,〔(alibaba.com )〕 which allow operators to jump much higher than with a simple coil spring pogo stick. Back flips and other tricks are now possible on some of these newer sticks, which has contributed to the growth of the new sport of Extreme Pogo ("Xpogo"). Yet no matter what improvements or different types are made, the basic design idea of man or woman riding on a spring remains the same. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pogo stick」の詳細全文を読む スポンサード リンク
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