Spring-loaded camming device

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A selection of spring-loaded camming devices of differing sizes Klim friends.jpg
A selection of spring-loaded camming devices of differing sizes
Climbers often carry a large number of cams on traditional climbs. Creeks Giving - Climbing in Indian Creek, Utah - 29.jpg
Climbers often carry a large number of cams on traditional climbs.

A spring-loaded camming device (also SLCD, cam or friend) is a piece of rock climbing or mountaineering protection equipment. It consists of two, three, or four cams mounted on a common axle or two adjacent axles, so that pulling on the axle forces the cams to spread farther apart. This is then attached to a sling and carabiner at the end of the stem. The SLCD is used by pulling on the "trigger" (a small handle) so the cams retract together, then inserting it into a crack or pocket in the rock and releasing the trigger to allow the cams to expand. A pull on the rope, such as that generated by a climber falling, will cause a properly placed SLCD to convert the pulling force along the stem of the unit into outwards pressure on the rock, generating massive amounts of friction and preventing the removal of the unit from the rock. Because of the large forces which are exerted on the rock when an SLCD is fallen on, it is very important that SLCDs are only placed in solid, strong rock. [1]

Contents

History

Vitaly Abalakov's invention of the Abalakov Cam was the first application to climbing of the principle of a cam to climbing equipment. His cams were sections cut out of a pulley wheel and bear a remarkable resemblance to today's tricams. Because these shapes were eccentric, the intercept angle of the cam changed as the cam rotates and expands.

In 1973 Greg Lowe filed for a patent for a cam that used a cam with a "constant intercept" angle. Using a logarithmic spiral [2] shape resulted in a uniform angle between the rock and each lobe of the cam; this constant angle is designed to always provide the necessary friction to hold a cam in equilibrium. [3] Designed so that a load produces a rotational force, the logarithmic cam shape allowed for a single device to fit securely in a range of crack sizes.

Modern SLCDs were invented by Ray Jardine in 1978 (US patent 4,184,657) [4] and sold under the brand name of "Friends". Ray designed a spring-loaded opposing multiple cam unit with a more stable 13.75 degree camming angle and an innovative triggering mechanism. (The term friend is now widely used by climbers to refer to SLCDs in general, but properly speaking it refers to the brand popularized by Mark Vallance and now manufactured by Wild Country.) Other popular brands include Black Diamond Camalots, Metolius Power Cams, DMM 4CUs, Trango FlexCams, and CCH Aliens.

Modern use

Use of a cam in a large crack Camalot number 6.JPG
Use of a cam in a large crack

The invention of SLCDs revolutionized rock climbing because it meant that parallel and flaring cracks could be easily protected. Furthermore, unlike pitons, SLCDs can be removed easily without causing damage to the rock, which made clean climbing (climbing without damaging the rock) practical on many more climbs. Since the invention of the Technical Friend (which replaces the original one-piece machined alloy shaft with a brazed assembly incorporating a length of thick stainless-steel cable, which is better able to cope with loading over an edge), there has been a great deal of development of the SLCD by a variety of manufacturers, e.g., the adoption of the dual axle design by Black Diamond, the invention of three-lobed camming units to fit smaller cracks, and the more recent invention of the Link Cam by Omega Pacific, a design that allows one SLCD to span an even larger range of crack sizes. SLCDs are sold in various sizes to fit a diverse range of cracks from about 6–300 millimetres (0.2–10 in) wide, though devices of below about 10 millimetres (0.4 in) or above about 100 millimetres (4 in) are not often seen.

Traditional climbers often climb with numerous and variously sized SLCDs to cover a wide range of crack sizes, often with multiples of the same size, depending on the protection requirements of the climb. Some popular climbing areas like Indian Creek, UT have extremely consistent feature sizes that require climbers to carry double-digit numbers of the same size SLCDs to properly protect a route.

Related Research Articles

<span class="mw-page-title-main">Traditional climbing</span> Type of rock climbing

Traditional climbing is a type of free climbing in rock climbing where the lead climber places the protection equipment while ascending the route; when the lead climber has completed the route, the second climber then removes the protection equipment as they climb the route. Traditional climbing differs from sport climbing where the protection equipment is pre-drilled into the rock in the form of bolts.

<span class="mw-page-title-main">Crampons</span> Traction device for ice-climbing

A crampon is a traction device attached to footwear to improve mobility on snow and ice during ice climbing. Besides ice climbing, crampons are also used for secure travel on snow and ice, such as crossing glaciers, snowfields and icefields, ascending snow slopes, and scaling ice-covered rock.

<span class="mw-page-title-main">Glossary of climbing terms</span> For rock climbing and mountaineering

Glossary of climbing terms relates to rock climbing, mountaineering, and to ice climbing.

<span class="mw-page-title-main">Rock-climbing equipment</span> List of manmade gear

Rock-climbing equipment varies with the type of climbing undertaken. Bouldering needs the least equipment outside of shoes and chalk and optional crash pads. Sport climbing adds ropes, harnesses, belay devices, and quickdraws to clip into pre-drilled bolts. Traditional climbing adds the need for carrying a "rack" of temporary passive and active protection devices. Multi-pitch climbing adds devices to assist in ascending and descending fixed ropes. And finally aid climbing uses unique equipment.

Self-locking devices are devices intended to arrest the fall of solo climbers who climb without partners. This device is used for rope solo climbing, for "ground-up climbing", and for "top rope solo climbing". To date, several types of self-locking devices have evolved.

<span class="mw-page-title-main">Belaying</span> Rock climbing safety technique using ropes

Belaying is a variety of techniques climbers use to create friction within a climbing system, particularly on a climbing rope, so that a falling climber does not fall very far. A climbing partner typically applies tension at the other end of the rope whenever the climber is not moving, and removes the tension from the rope whenever the climber needs more rope to continue climbing.

<span class="mw-page-title-main">Nut (climbing)</span> Protection equipment in rock climbing

In rock climbing, a nut is a metal wedge threaded on a wire that climbers use for protection by wedging it into a crack in the rock. Quickdraws are clipped to the nut wire by the ascending climber and the rope threads through the quickdraw. Nuts come in a variety of sizes and styles, and several different brands are made by competing manufacturers. Most nuts are made of aluminum. Larger nuts may be threaded on Dyneema cord instead of wire, but this has become unusual.

<span class="mw-page-title-main">Clean climbing</span> Rock climbing techniques which avoid damage to the rock

Clean climbing is rock climbing techniques and equipment which climbers use in order to avoid damage to the rock. These techniques date at least in part from the 1920s and earlier in England, but the term itself may have emerged in about 1970 during the widespread and rapid adoption in the United States and Canada of nuts, and the very similar but often larger hexes, in preference to pitons, which damage rock and are more difficult and time-consuming to install. Pitons were thus eliminated in North America as a primary means of climbing protection in a period of less than three years.

<span class="mw-page-title-main">Piton</span> Metal tool used in rock climbing

A piton in big wall climbing and in aid climbing is a metal spike that is driven into a crack or seam in the climbing surface using a climbing hammer, and which acts as an anchor for protecting the climber from falling or to assist progress in aid climbing. Pitons are equipped with an eye hole or a ring to which a carabiner is attached; the carabiner can then be directly or indirectly connected to a climbing rope.

<span class="mw-page-title-main">Rock climbing</span> Type of sport

Rock climbing is a sport in which participants climb up, across, or down natural rock formations or indoor climbing walls. The goal is to reach the summit of a formation or the endpoint of a usually pre-defined route without falling. Rock climbing is a physically and mentally demanding sport, one that often tests a climber's strength, endurance, agility and balance along with mental control. Knowledge of proper climbing techniques and the use of specialized climbing equipment is crucial for the safe completion of routes.

<span class="mw-page-title-main">Prusik knot</span> Type of knot

A Prusik is a friction hitch or knot used to attach a loop of cord around a rope, applied in climbing, canyoneering, mountaineering, caving, rope rescue, ziplining, and by arborists. The term Prusik is a name for both the loops of cord used to tie the hitch and the hitch itself, and the verb is "to prusik" or "prusiking". More casually, the term is used for any friction hitch or device that can grab a rope. Due to the pronunciation, the word is often misspelled Prussik, Prussick, or Prussic.

In rock climbing, an anchor can be any device or method for attaching a climber, a rope, or a load above or onto a climbing surface—typically rock, ice, steep dirt, or a building—either permanently or temporarily. The intention of an anchor is case-specific but is usually for fall protection, primarily fall arrest and fall restraint. Climbing anchors are also used for hoisting, holding static loads, or redirecting a rope.

<span class="mw-page-title-main">Belay device</span> Mechanical piece of climbing equipment

A belay device is a mechanical piece of climbing equipment used to control a rope during belaying. It is designed to improve belay safety for the climber by allowing the belayer to manage their duties with minimal physical effort. With the right belay device, a small, weak climber can easily arrest the fall of a much heavier partner. Belay devices act as a friction brake, so that when a climber falls with any slack in the rope, the fall is brought to a stop.

<span class="mw-page-title-main">Tricam</span> Type of rock climbing protection

A tricam is a type of climbing protection equipment. A versatile nut/cam hybrid, the Tricam was invented by Greg Lowe in 1973, and came to market in 1981. They are currently manufactured by C.A.M.P. of Premana Italy.

<span class="mw-page-title-main">Wild Country (company)</span> British manufacturer of rock climbing equipment

Wild Country is a major manufacturer of rock-climbing equipment, and is most noted for introducing the Friend, a spring-loaded camming device. The company is based in Tideswell in the English Peak District, close to some of the UK's most popular climbing areas.

<span class="mw-page-title-main">Hex (climbing)</span> Rock climbing equipment to arrest a fall

A hex is an item of rock-climbing equipment used to protect climbers from falls. They are intended to be wedged into a crack or other opening in the rock, and do not require a hammer to place. They were developed as an alternative to pitons, which are hammered into cracks, damaging the rock. Most commonly, a carabiner will be used to join the hex to the climbing rope by means of a loop of webbing, cord or a cable which is part of the hex.

<span class="mw-page-title-main">Abalakov thread</span> Ice climbing loop knot

The Abalakov thread, also known as a V-thread, A-thread, or 0-thread, is an ice protection technique named after its inventor, Soviet climber Vitaly Abalakov. The Abalakov thread is a common method of protecting oneself while ice climbing because it is easy to create, does not require the sacrifice of expensive gear, and can be very safe when used properly. An Abalakov thread is often used in multi-pitch ice climbing routes. Because of its safety and convenience, the Abalakov thread is considered one of the most significant innovations in ice climbing. It significantly expanded the scope of possible routes and abseiling safety.

<span class="mw-page-title-main">Camalot</span> Spring-loaded camming device

Camalot is a brand of spring-loaded camming devices manufactured by Black Diamond Equipment used to secure ropes while rock climbing. Camalots use a dual-axle system, resulting in a slightly higher expansion range than similarly sized single axle units, however that results in significant weight penalty. Dual-axle was patented and for decades was only used by Black Diamond, however the patent has expired in 2005 and several other manufacturers began producing dual-axel cams, often also replicating Camalots sizes and coloring. Most notable Camalot look-alikes include DMM Dragons and Wild Country's New Friends.

<span class="mw-page-title-main">Crack climbing</span> Type of rock climbing

Crack climbing is a type of rock climbing in which the climber follows a crack in the rock and uses specialized climbing techniques. The sizes of cracks vary from those that are just barely wide enough for the fingers to fit inside, to those that are so wide that the entire body can fit inside with all limbs outstretched. Many traditional climbing routes follow crack systems, as they provide natural opportunities for placing protective equipment.

<span class="mw-page-title-main">Mark Vallance</span> British rock climber and company founder

Mark Vallance was a British rock climber, mountaineer and founder of Wild Country, a climbing equipment company.

References

  1. Cox, Steven M.; Kris Fulsaas, eds. (2003). Mountaineering: The Freedom of the Hills (7 ed.). Seattle: The Mountaineers. ISBN   0-89886-828-9.
  2. Matt Samet (2011). The Climbing Dictionary: Mountaineering Slang, Terms, Neologisms & Lingo: An Illustrated Reference. The Mountaineers Books. p. 44. ISBN   978-1-594-85503-0.
  3. Duke SLCD research Archived 2008-10-25 at the Wayback Machine retrieved (2009-08-05)
  4. Jardine, Raymond D. (1980-01-22), United States Patent: 4184657 - Climbing aids , retrieved 2009-12-21