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A belay device is a mechanical piece of climbing equipment used to control a rope during belaying.[1] 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.
Typically, when the rope is held outward, away from the body, it moves relatively freely, so the belayer can take up or pay out slack. When the rope is brought backward, to the side of the body, the rope is forced into tight bends and rubs against the device and/or against itself, allowing the belayer to arrest the descent of a climber in the case of a fall. This rubbing slows the rope, but also generates heat. Some types of belay devices can arrest a fall without the belayer taking any action, while others require the belayer to hold or pull the rope in a particular direction.
Belay devices usually attach to the harness of the belayer via a carabiner, and are usually made of aluminium or an alloy. Some belay devices can also be used as descenders for a controlled descent on a rope, that is abseiling or rappeling.
Many belay devices can be used to control either one rope, or two ropes in parallel. There are many reasons why the two-rope option might be chosen by a climber, including the consideration of reducing rope drag.
There are also auto-belay devices on the market which allow a climber to climb solo in his or her climbing gym.
Types of belay devices[edit]
Aperture[edit]
This is a device that you feed a bight (loop) of rope through a hole or aperture and then hook it into a locking carabiner on the harness.
Sticht plate[edit]
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The Sticht plate was the first mechanical rope brake, named after its designer, Fritz Sticht. It consists of a small metal plate with a slot that allows a bight of rope to pass through to a locking carabiner and back out. This locking carabiner is clipped to the belayer who is then able to lock the rope at will.
Some plates had two slots for double ropes. The slots could also be different sizes for different diameter ropes e.g. 9mm and 11mm. A wide wire spring may be attached on one side to help keep the plate away from the brake carabiner to ease feeding and taking in rope. A smaller hole is often present for accessory cord to carry the device. Sticht plates are typically forged from aluminium alloy in a round disc shape, although other shapes such as rounded rectangles were also made.
Although any belaying plate with one or two slots is often called a Sticht plate, Fritz Sticht originally patented the design with Hermann Huber for Salewa GmbH in 1970, who sold it as the Salewa Sticht Bremse (Sticht Brake).
Sticht plates have become less popular since more modern designs provide smoother control over the rope and are less prone to jamming, especially when doubling as a descender.
Tubular devices[edit]
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. As a result, this is generally the most common type of belay device used.
Besides arresting the fall of a climber, these devices can also be used for rappelling.
Figure eight[edit]
Sometimes just called an 'eight', this device is most commonly used as a descender. A figure eight can be used for belaying, and indeed there are some which are designed specifically for belaying, however they are not generally popular due to the tendency to twist the rope. There are also variations on this design including DMM's 'cardiac arrester' which does the same thing but is shaped like a heart. It is designed to help stop rope twisting. Figure eights, although not the most common belay device, are still frequently found in use. For most uses, a tubular style belay device is easier and safer to use. However, due to their tendency to twist rope and general disagreement about their safety, figure eights are often banned in climbing gyms.
Assisted braking[edit]
Under the right conditions, assisted braking devices use a sudden load on the rope to engage a camming mechanism (known as active, or mechanically assisted braking devices) or pull the belay carabiner into a pinch point (known as passive, or geometrically assisted braking devices) to prevent the rope from passing through the belay device. The terms 'self-' or 'auto-locking' are discouraged, because it is recommended to always keep the brake hand on the rope.[2][3] There do exist rare conditions where these devices' braking functions may not apply correctly, though accident statistics show that these incidents are often user-error.[citation needed] An icy, muddy, worn, too-thin of a rope, or possibly other conditions, such as insufficient training and experience, may affect a device's braking function.
Guide plate[edit]
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A Guide Plate, also known as an auto-blocking belay device,[4] is a metal plate with an elongated slot for the bight to go through and then a carabiner is attached so that when pull from the climber occurs the carabiner will be pulled to lock off the device.
Tubular device variant[edit]
A similar device to the traditional tubular belay device which has two extra loops; normally situated on the front and back of the device. When the device is attached directly to an anchor point with the use of a second carabiner through the larger of the two loops it performs a similar stopping function to that created with the guide plate. The device is also able to be used as a standard tubular device when belaying from the harness.
Grigri[edit]
Statistically, by sales volume, the Grigri is the most popular mechanically assisted braking belay device.[citation needed] A Grigri, when properly used, assists in braking the rope with a camming device that clamps the rope in the event of a fall. Because of the braking mechanism, modified belay techniques are widely used, though Petzl, the device's manufacturer, has approved only certain techniques for instructing new belayers. Grigris reportedly give a harder catch than a regular belay device because they allow little to no rope slippage when catching a fall. On the upside, this is offset by the fact that the person being belayed falls a shorter distance. They are a proprietary design by Petzl.
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The original Grigri is rated for 10 to 11 mm single ropes, while the newer, smaller Grigri 2 is rated for 8.9 to 11 mm single ropes and optimized for 9.4 to 10.3 mm ropes.[5] Trango sells a similar assisted braking belay device called the Cinch that is rated to work on ropes 9.4 to 11 mm.
Using a Grigri to bring up a second on a traditional anchor is however less favorable than other belay devices because the Grigri gives a more static catch with little to no rope slippage. This increases the amount of force exerted on the anchor which, in turn, increases the chance of anchor failure.
Revo[edit]
The Revo combines the easy and dynamic handling of a tuber with the backup by a centrifugal brake. Paying out and taking in rope works fluently without resistance. Only when the rope rushes with a faster speed than 4 metre/second through the device, it arrests within a few centimetres.
Self-belay devices[edit]
Self-belay devices are designed to allow solo climbing where the climber wears the belay device, or secures it to a fixed object on the ground. These devices automatically lock without any intervention when the rope passing through reaches a sufficient velocity (during a fall), but allow rope to move relatively freely whilst climbing.
Auto-belay devices[edit]
Auto-belay devices allow climbers to practice without a second person for belaying. These devices usually hang on or are attached to an artificially made climbing wall. There are several different types of auto-belay device, including ones that run on hydraulics, magnetic braking technology, centrifugal force, and friction.[6]
See also[edit]
References[edit]
- ^Cox, Steven M.; Kris Fulsaas, eds. (2003). Mountaineering: The Freedom of the Hills (7 ed.). Seattle: The Mountaineers. ISBN0-89886-828-9.
- ^'The DMM Pivot: Innovation Worth the Effort - Alpinist.com'. www.alpinist.com. Retrieved 2018-03-31.
hence the proper phrase used for these devices—'assisted braking' rather than 'self-locking.'
- ^'Auto Lock Belay Devices'. Mountain Project. Retrieved 2018-03-31.
There aren't any auto-lockng belay devices outside of climbing walls because the 'official' term is assisted locking braking device
- ^'Autoblocking Belay Devices'. Archived from the original on 2013-10-20.
- ^Description of GRIGRI-2 at petzl.com
- ^'Why Auto Belay?'. Head Rush Technologies. Retrieved 7 March 2014.
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External links[edit]
| Wikimedia Commons has media related to Belay device. |
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- Sticht plates article on German Wikipedia