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Some poles come with spring-loaded sections to aid walking under normal conditions and to reduce wrist strain, but such devices may only add unwanted weight and noise to the poles. They are usually made from lightweight aluminum or carbon fiber .
Axel Composites has a patent for carbon fiber ski poles dating back to 1975, however, inventor David P. Goode's improved design from 1989 became the first widely produced. [ 12 ] [ 13 ] [ 14 ] The carbon fiber pole builds on the same qualities of the aluminum pole: lightness and stiffness while being extremely strong.
In 1989, Goode patented a method for making carbon composite ski poles, [2] and then in 1996, the company patented a carbon fiber composite ski. [ 3 ] In 2001, the company expanded its factory and purchased the production assets of Volant skis , and currently produces a full line of carbon fiber snow skis.
Spring stilts also known as bounce stilts are spring-loaded and allow the user to run, jump and perform various acrobatics. Spring stilts using fiberglass leaf springs were patented in the United States in 2004 under the trademark "PowerSkip", marketed for recreational and extreme sports use. [ 2 ]
An adult holding a pogo stick A high-performance pogo stick as used in "Xpogo". A pogo stick is a vehicle 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. [1]
A boom vang (US) or kicking strap (UK) (often shortened to "vang" or "kicker") is a line or piston system on a sailboat used to exert downward force on the boom and thus control the shape of the sail.
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