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Free climbing is a form of rock climbing specifically contrasted with aid climbing. Like aid climbing, it may use ropes and other means of climbing protection, but only to protect against injury during falls, and not to assist progress. The term ''free climbing'' originally meant "free from aid". Free climbing includes solo climbing, traditional climbing, sport climbing and bouldering. In contrast to these, climbing equipment is used in aid climbing to assist the climber in ascending the climb, and sometimes includes a means for pulling the climber upward or providing points where the climber can stand on equipment to assist in the climb. ==Methods and techniques== In lead climbing, a climber climbs a route from the ground up. For protection against a fall, the lead climber trails a rope which is managed by a belayer who remains on the ground or at an established anchor. As the leader climbs, he either places traditional protection such as cams and stoppers, or clips his rope through pre-placed bolted hangers or fixed anchors. The belayer feeds rope to the lead climber through a belay device, keeping a minimum amount of slack in the system, and keeping himself ready to catch the leader in case of a fall. The leader climbs until the top is reached, and he can then belay the following climber from above. Both climber and belayer attach the rope to their climbing harnesses. The rope is tied into the climber's harness with a figure-of-eight loop or double bowline knot. The leader either places their own protection or clips into permanent protection already attached to the rock. In traditional climbing, the protection generally is removable. However, many significant first ascents in the U.S. done with a combination of crack gear and bolts placed on lead were termed "traditional" at the time (see below discussion). Usually nuts or spring-loaded camming devices (often referred to as "cams" or "friends") are set in cracks in the rock (although pitons are sometimes used). In sport climbing the protection is metal loops called hangers. Hangers are secured to the rock with either expanding masonry bolts taken from the construction industry, or by placing glue-in bolt systems. In ice climbing the protection is made-up of ice screws or similar devices hammered or screwed into the ice by the leader, and removed by the second climber. The lead climber typically connects the rope to the protection with carabiners or quickdraws. If the lead climber falls, they will fall twice the length of the rope from the last protection point, plus rope stretch (typically 5% to 8% of the rope out), plus slack. If any of the gear breaks or pulls out of the rock or if the belayer fails to lock off the belay device immediately, the fall will be significantly longer. Thus if a climber is 2 meters above the last protection he will fall 2 meters to the protection, 2 meters below the protection, plus slack and rope stretch, for a total fall of over 4 meters. If the leader falls, the belayer must arrest the rope to stop the fall. To achieve this the rope is run through a belay device attached to the belayer's harness. The belay device runs the rope through a series of sharp curves that, when operated properly, greatly increases friction and stops the rope from running. Some of the more popular types of belay devices are the ATC Belay Device, the Figure 8 and various auto-locking belay devices such as the Petzl Gri-Gri. If the route being climbed is a multi-pitch route the leader sets up a secure anchor system at the top of the pitch, also called a belay, from where s/he can belay as his/her partner climbs. As the second climber climbs, he/she removes the gear from the rock in case of traditional climbing or removes the quickdraws from the bolts in the case of sport climbing. Both climbers are now at the top of the pitch with all their equipment. Note that the second climber is protected from above while climbing, but the lead climber is not, so being the lead climber is more challenging and dangerous. After completing the climb, and with both climbers at the top of the pitch, both climbers must rappel or descend the climb in order to return to their starting point, or top out and walk off. All climbs do not necessarily require the lead climber to belay the second climber from the top. The belayer could lower the lead climber down after he/she has completed a single pitch route. 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「free climbing」の詳細全文を読む スポンサード リンク
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