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Grigri (climbing)
A Grigri (or GriGri, Gri-gri or Gris-gris) is an assisted braking belay device manufactured by Petzl designed to help secure rock-climbing, rappelling, and rope-acrobatic activities. Its main characteristic is a clutch that assists in braking under a shock load. The success of this device has led to ''grigri'' becoming a common name for devices of this type. In 2011〔http://www.climberism.com/petzl-grigri-2-to-be-release-in-the-usa-in-march/〕 a new version, the GriGri 2 was released to replace the original which has been in production since 1991.〔http://www.petzl.com/en/outdoor/belay-devices-and-descenders〕 Competitors include the Faders Sum, Trango Cinch and Edelrid Eddy.
==Mechanism of operation==
The Grigri works by pinching the rope when it is moving quickly (like in a fall), making it an assisted braking belay device unlike traditional belay devices such as a Sticht plate or an ATC. Internally, the rope runs along a cam, which allows the rope to pass if moving slowly but when the rope moves quickly the cam will rotate, pinching the rope.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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