Jumar
Encyclopedia
An ascender is a mechanical device used for ascending on a rope. One such device is a Jumar, named after the Swiss factory which developed the first tool for sale in 1958. The device's name also leads to the term Jumaring for the process of using such a device. Other terms for this process include ascending, prusiking and jugging.
Ascenders offer similar functionality to friction knot
s, but are faster and easier to use, albeit with consequences in security (as ascenders can, even with a locking carabiner, come off the rope, and fail by shredding the rope at high loads, rather than slipping and fusing as with friction knots). An ascender employs a cam which allows the device to slide freely in one direction (usually the intended direction of movement), and provide a firm grip on the rope when pulled on in the opposite direction. To prevent an ascender from accidentally coming off the rope, a locking mechanism or trigger is deployed. The ascender is first attached to the climber's harness by a piece of webbing or sling, and then is clipped onto the rope and locked. For climbing on a fixed rope attached, for example, to snow anchors on a steep slope, only one ascender is used, keeping the other hand free for holding an ice axe
.
Jumaring, also referred to as jugging, is where the second climber (the one who belays the lead climber on the route) uses ascenders to climb the rope instead of climbing directly on the rock. Along with the ascenders, one or more webbing
"ladders" called étriers (or aiders) are typically used to allow the climber to use their feet to step up and pull themselves up the rope.
Ascending is not typically performed on free climbing
routes where a climber uses his or her hands and feet on the rock, climbing the features, edges, cracks, and pockets that the route provides without artificial aids. Typically, ascending is reserved for aid climbing
where the climbers are climbing near-featureless faces of rock, usually with very thin cracks that a person probably could not get their fingers into to make the holds useful. In aid climbing, the climbers are very dependent on gear placements to ascend the route, using the étrier to step as high as possible on a piece of gear to place another piece of gear. Since some pieces are only intended for placement for movement and not protection, the leader does not leave every piece of gear he places to climb the route. The leader can climb with a lighter rack if he or she places gear necessary to advance on the route, then removes gear regularly as he steps into the next higher étrier, yet leaving enough safely placed gear to protect against a fall. Once the leader has set up the belay, the former belayer begins climbing the rope. Since the leader has more than likely removed a great deal of gear as he or she climbed the route, and the rock being relatively featureless, it makes ascending necessary to ascend the route.
In caving
, ascending a rope by means of mechanical devices is often necessary and is the main alternative to ladder use. The rock which forms the cave is often wet, slippery, relatively featureless and often unreachable from the necessary rope locations. So climbing the rope may well be preferable to climbing the rock or a ladder, provided that a belay location that provides a dry ascent has already been found.
Ascenders can also be used as a braking component within a rope hauling system, often used in rescue situations.
Jumar Pangit, a Swiss manufacturer located then in Reichenbach
(Switzerland), was founded by Adolph Juesi and Walter Marti. Juesi was studying eagles for the Swiss government and needed to ascend on ropes in order to perform his work, so Marti developed the ascender for him. In 1958, the first jumar was introduced to the climbing market. This page (archived) gives an overview on the older Jumar models. A newer model is still in production.
French caver Fernand Petzl
developed a mechanical rope ascender in 1968, and his company Petzl
continues to produce both handled and handleless models that are popular with mountaineers and cavers today.
Other countries, notably the United States, have also produced rope ascenders.
Friction hitch
A friction hitch is a kind of knot used to attach one rope to another in a way that is easily adjusted. These knots are commonly used in Single Rope Technique while climbing to ascend a hanging rope by alternately hanging on one friction hitch and sliding the other up...
s, but are faster and easier to use, albeit with consequences in security (as ascenders can, even with a locking carabiner, come off the rope, and fail by shredding the rope at high loads, rather than slipping and fusing as with friction knots). An ascender employs a cam which allows the device to slide freely in one direction (usually the intended direction of movement), and provide a firm grip on the rope when pulled on in the opposite direction. To prevent an ascender from accidentally coming off the rope, a locking mechanism or trigger is deployed. The ascender is first attached to the climber's harness by a piece of webbing or sling, and then is clipped onto the rope and locked. For climbing on a fixed rope attached, for example, to snow anchors on a steep slope, only one ascender is used, keeping the other hand free for holding an ice axe
Ice axe
An ice axe, is a multi-purpose ice and snow tool used by mountaineers both in the ascent and descent of routes which involve frozen conditions. It can be held and employed in a number of different ways, depending on the terrain encountered...
.
Jumaring, also referred to as jugging, is where the second climber (the one who belays the lead climber on the route) uses ascenders to climb the rope instead of climbing directly on the rock. Along with the ascenders, one or more webbing
Webbing
Webbing is a strong fabric woven as a flat strip or tube of varying width and fibres often used in place of rope. The name webbing comes from the meshed material frequently used in its construction, which resembles a web...
"ladders" called étriers (or aiders) are typically used to allow the climber to use their feet to step up and pull themselves up the rope.
Ascending is not typically performed on free climbing
Free climbing
Free climbing is a type of rock climbing in which the climber uses only hands, feet and other parts of the body to ascend, employing ropes and forms of climbing protection to prevent falls only....
routes where a climber uses his or her hands and feet on the rock, climbing the features, edges, cracks, and pockets that the route provides without artificial aids. Typically, ascending is reserved for aid climbing
Aid climbing
Aid climbing is a style of climbing in which standing on or pulling oneself up via devices attached to fixed or placed protection is used to make upward progress....
where the climbers are climbing near-featureless faces of rock, usually with very thin cracks that a person probably could not get their fingers into to make the holds useful. In aid climbing, the climbers are very dependent on gear placements to ascend the route, using the étrier to step as high as possible on a piece of gear to place another piece of gear. Since some pieces are only intended for placement for movement and not protection, the leader does not leave every piece of gear he places to climb the route. The leader can climb with a lighter rack if he or she places gear necessary to advance on the route, then removes gear regularly as he steps into the next higher étrier, yet leaving enough safely placed gear to protect against a fall. Once the leader has set up the belay, the former belayer begins climbing the rope. Since the leader has more than likely removed a great deal of gear as he or she climbed the route, and the rock being relatively featureless, it makes ascending necessary to ascend the route.
In caving
Caving
Caving—also occasionally known as spelunking in the United States and potholing in the United Kingdom—is the recreational pastime of exploring wild cave systems...
, ascending a rope by means of mechanical devices is often necessary and is the main alternative to ladder use. The rock which forms the cave is often wet, slippery, relatively featureless and often unreachable from the necessary rope locations. So climbing the rope may well be preferable to climbing the rock or a ladder, provided that a belay location that provides a dry ascent has already been found.
Ascenders can also be used as a braking component within a rope hauling system, often used in rescue situations.
History
The first mechanical rope ascending devices were created by Henri Brenot, and were used in France both for mountaineering and caving as early as 1934.Jumar Pangit, a Swiss manufacturer located then in Reichenbach
Reichenbach
- In Germany :* Reichenbach , in the Niederschlesischer Oberlausitzkreis district, Saxony* Reichenbach im Vogtland, in the Vogtlandkreis district, Saxony* Reichenbach am Heuberg, in the Tuttlingen district, Baden-Württemberg...
(Switzerland), was founded by Adolph Juesi and Walter Marti. Juesi was studying eagles for the Swiss government and needed to ascend on ropes in order to perform his work, so Marti developed the ascender for him. In 1958, the first jumar was introduced to the climbing market. This page (archived) gives an overview on the older Jumar models. A newer model is still in production.
French caver Fernand Petzl
Fernand Petzl
Fernand Petzl was a caver and manufacturer of outdoor equipment under the brand name Petzl.Petzl lived most of his life in the village of Saint-Ismier , France at the foot of the mountain Dent De Crolles. He first went caving in Trou du Glaz in 1933, and was immediately captivated by the idea of...
developed a mechanical rope ascender in 1968, and his company Petzl
Petzl
Petzl is a world leading manufacturer of climbing gear, caving gear, work-at-height equipment, and headlamps based in Crolles , France. The company was created by the cave explorer Fernand Petzl in the mid-1970s...
continues to produce both handled and handleless models that are popular with mountaineers and cavers today.
Other countries, notably the United States, have also produced rope ascenders.