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Poldo Tackle
The poldo tackle is an instant tension-applying and tension-releasing mechanism. Accessed: 5/8/2012 The allows for a 2:1 mechanical advantage using only rope. See also * List of knots *Versatackle knot
A versatackleThe complete guide to knots and knot tying — Geoffrey Budworth — p.237 — is a self-locking tensioning structure implemented in cordage. ...
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Tension (mechanics)
In physics, tension is described as the pulling force transmitted axially by the means of a string, a rope, chain, or similar object, or by each end of a rod, truss member, or similar three-dimensional object; tension might also be described as the action-reaction pair of forces acting at each end of said elements. Tension could be the opposite of compression. At the atomic level, when atoms or molecules are pulled apart from each other and gain potential energy with a restoring force still existing, the restoring force might create what is also called tension. Each end of a string or rod under such tension could pull on the object it is attached to, in order to restore the string/rod to its relaxed length. Tension (as a transmitted force, as an action-reaction pair of forces, or as a restoring force) is measured in newtons in the International System of Units (or pounds-force in Imperial units). The ends of a string or other object transmitting tension will exert forces on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Block And Tackle
A block and tackle or only tackle is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load. The rope is threaded through the pulleys to provide mechanical advantage that amplifies the force applied to the rope. Hero of Alexandria described cranes formed from assemblies of pulleys in the first century. Illustrated versions of Hero's ''Mechanica'' (a book on raising heavy weights) show early block and tackle systems. Overview A block is a set of pulleys or sheaves mounted on a single frame. An assembly of blocks with a rope threaded through the pulleys is called tackle. The process of threading ropes or cables through blocks is called "reeving", and a threaded block and tackle is said to have been "rove". A block and tackle system amplifies the tension force in the rope to lift heavy loads. They are common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rope
A rope is a group of yarns, plies, fibres, or strands that are twisted or braided together into a larger and stronger form. Ropes have tensile strength and so can be used for dragging and lifting. Rope is thicker and stronger than similarly constructed cord, string, and twine. Construction Rope may be constructed of any long, stringy, fibrous material, but generally is constructed of certain natural or synthetic fibres. Synthetic fibre ropes are significantly stronger than their natural fibre counterparts, they have a higher tensile strength, they are more resistant to rotting than ropes created from natural fibres, and they can be made to float on water. But synthetic ropes also possess certain disadvantages, including slipperiness, and some can be damaged more easily by UV light. Common natural fibres for rope are Manila hemp, hemp, linen, cotton, coir, jute, straw, and sisal. Synthetic fibres in use for rope-making include polypropylene, nylon, polyesters (e.g. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Knots
This list of knots includes many alternative names for common knots and lashings. Knot names have evolved over time, and there are many conflicting or confusing naming issues. The overhand knot, for example, is also known as the thumb knot. The figure-eight knot is also known as the Savoy knot or the Flemish knot. A * Adjustable Bend – can be easily lengthened or shortened * Adjustable Grip Hitch – a simple hitch which may easily be shifted up and down the rope while slack *Albright Special – used to tie two different diameters of line together, for instance to tie monofilament to braid *Alpine Butterfly (also known as Butterfly Loop) – a static loop mostly used by mountain climbers and rappellers for securing a carabiner to static rope. * Alternate Ring Hitching – covering a ring in hitching can prevent damage * Anchor Bend – attaching a rope to a ring or similar termination *Angler's Loop – knot which forms a fixed loop. Useful for fine or slippery line, it is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Versatackle Knot
A versatackleThe complete guide to knots and knot tying — Geoffrey Budworth — p.237 — is a self-locking tensioning structure implemented in cordage. It consists of two loops with the rope passed back and forth between them. It is functionally similar to the trucker's hitch; however, unlike the trucker's hitch, the versatackle is self-locking under tension. The pressure, friction, and heat that may be generated by the running end moving through the loops can accelerate wear at the loops. Step-by-step images Image:Versatackle Knot Step1.jpg, Make a loop knot on one end of the rope and another loop knot in the middle, just shorter than the area to be bound. (An overhand loop knot can be used here, but a Butterfly Knot works better because it doesn't jam when strained and it's easy to untie.) Image:Versatackle Knot Step2.jpg, Pass the second working end through the loop knot in the first working end. Image:Versatackle Knot Step3.jpg, Bring the second working end up through the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
