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An ascender is a device (usually mechanical) used for directly ascending, or for facilitating protection, with a fixed rope when climbing on steep mountain terrain. A form introduced in the 1950s became so popular it began the term "Jumar" for the device, and the verb "to jumar" to describe its use in ascending.
The ascender will glide smoothly up the rope when the belayer takes in slack. If the climber falls, the ascender will lock up. (I’m giving them the benefit of the doubt and assuming that the ...
Multi-pitch climbing, which can be done in sport or traditional formats, requires added rope devices like ascenders and descenders for moving up and down fixed-ropes. The big wall variant requires heavy-duty rope devices for carrying more gear such as portaledges and provisions, which are carried in haul bags .
A Gibbs-style ascender. The next level of device development improved on the locking limitations of the prusik sling by utilizing a cam that is activated by the climber's body moving down to rotate the simple grab cam inside a rigid frame. The climber's harness is directly attached to the cam and the frame encapsulates the rope.
Sit-stand systems (also known as frog rig) - one ascender is at chest level attached to the sit harness, and a second is held in the hand with a long loop of rope for the feet. Movement up the rope is by repeated moving of the foot loop ascender up the rope, pushing up with both feet together, and sitting, supported by the chest ascender.
A Tubular Belay device. Also called a "tube", this type of device generally has a tubular or rectangular shape. It is an evolution of the Sticht plate's concept by creating more surface area to dissipate heat and the ability to create sharper angles which creates a stronger degree of friction which has greater stopping power.
While traditional auto belays use a top roping format with the device hanging from the top of the route, in 2021, a new type of auto belay–the lead auto belay–was developed that used a lead climbing format (i.e. the climber clipped into the quickdraws like a normal lead climb on a sport climbing route), where the device was fixed to the bottom of the route.
A Petzl Croll with the gate closed, open and with a rope locked in place. A Petzl Croll is an ascending device [1] used in caving and industrial rope access made by the French company Petzl.
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