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Encyclopedia > Shackle

A shackle is a U-shaped piece of metal secured with a pin or bolt across the opening, or a hinged metal loop secured with a quick-release locking pin mechanism. They are very commonly used in outdoor activities such as sailing. Pin is a word with multiple meanings: Look up Pin in Wiktionary, the free dictionary A pin is a device used for fastening objects or material together. ... A bolt may be one of the following things: A type of threaded fastener. ... Wooden sailing boat Sailing is the skillful art of controlling the motion of a sailing ship or smaller boat, across a body of water using wind as the source of power. ...


A carabiner is a special kind of shackle used in mountaineering. A carabiner or karabiner (colloquially: crab, krab, or biner) is a metal loop with a sprung or screwed gate. ... If you were looking for the car, please see Mercury Mountaineer. ...


Types

Pin shackle 
A pin shackle is closed with a clevis pin. Primarily used above the deck, pin shackles used to be the most common shackle used aboard boats. Pin shackles can be inconvenient to work with at times because they are secured using something else, usually a cotter pin or seizing wire.
Threaded shackle 
The pin is threaded and one leg of the shackle is tapped. The pin may be "captive", to prevent it from being dropping loose. A threaded pin may also have a hole into which a cotter pin can be inserted. The threads may gall if over-tightened or have been corroding in the salt air, so a liberal coating of lanolin is not out of place on any and all threads. A shackle key or metal marlin spike are useful tools for loosing a tight nut. Unlike the pin shackle, a threaded shackle can stay together just with threads. For safety, however, it is usually wired or cotter pinned to secure the shackle in a closed position.
Snap shackle 
As the name implies, a snap shackle is a fast action fastener which can be implemented single handed. It uses a spring activated locking mechanism to close a hinged shackle, and can be unfastened under load. This is a potential safety hazard, but can also be extremely useful at times. The snap shackle is not as secure as any other form of shackle, but can come in handy for temporary uses or in situations which must be moved or replaced often, such as a sailor's harness tether.
D-shackle
A narrow shackle shaped like a loop of chain, usually a pin or threaded pin closure. This is probably the most common shackle type, and most others are a variation on the theme. The small loop can take high loads primarily in line. Side and racking loads may twist or bend this shackle.
Headboard 
This longer version of a D-shackle is used to attach halyards to sails, especially sails fitted with a headboard such as on Bermuda rigged boats. Headboard shackles are often stamped from flat strap stainless steel, and feature an additional pin between the top of the loop and the bottom so the headboard does not chafe the spliced eye of the halyard.
Twist 
A twist shackle is usually somewhat longer than the average, and features a 90° twist so the top of the loop is perpendicular to the pin. One of the uses for this shackle include attaching the jib halyard block to the mast, or the jib halyard to the sail, to reduce twist on the luff and allow the sail to set better.
Bow 
With a larger "O" shape to the loop, this shackle can take loads from many directions without developing as much side load. However, the larger shape to the loop does reduce its overall strength.

link titleA clevis pin is a type of fastener that will allow rotation of the connected parts about the axis of the pin. ... Cotter pins: A. new B. as-installed C. spring type D. cross-section of traditional design A cotter pin is a metal fastener that is bent during installation, similar to a staple or rivet. ... Lanolin, a grease from wool-bearing animals, acts as a skin ointment, water-proofing wax, and raw material (such as in shoe polish). ... A nut is a type of hardware fastener with a threaded hole. ... The term harness has been used for many centuries for part of the collection of equipment known as horse tack, essential in the domestic, military, and agrarian use of horses. ... Look up Chain in Wiktionary, the free dictionary A chain can be any of the following: a flexible connection through multiple rigid links; applications include: pulling (it cannot be used for pushing) power transmission, as in roller chains (e. ... In sailing, a halyard is a line (rope) that is used to hoist (pull up) a sail or a yard to which a sail has been attached (bent on). ... A sail is a surface intended to generate thrust by being placed in a wind; basically it is a vertically oriented wing. ... A headboard is an item of furniture. ... In sailing, a bermuda rig is: A rig of mainsail or course that consists of a triangular sail set aft of the mast, with its head raised to the top of the mast, its luff running down the mast and normally attached to it for all its length, its tack... There are several parishes that have the name Chafe In Nigeria, Africa Chafe, Nigeria In Portugal, Europe Chafé (pronunciation: sha-FEH), a parish in the municipality of Viana do Castelo Other Chafe, a Martian crater chafe is heat excited by friction and vexation, irritation of mind and rage. ... Splice has several meanings: In outdoor recreation (such as sailing or camping) it means to join two pieces of rope or wire by weaving the strands of each into the other - see rope splicing In film technique it means to join the ends of two pieces of film or magnetic... An eye is an organ that detects light. ... See also: Jib (television) A jib is a triangular staysail set ahead of the foremost mast of a sailing boat. ... In sailing, a block is a pulley or a number of pulleys enclosed in sheaves so as to be fixed to the end of a line or to a spar or surface. ... mizzen mast, mainmast and foremast Grand Turk The mast of a sailing ship is a tall vertical pole which supports the sails. ... diagram showing the names of the parts of a sail The lower edge of a triangular sail is called the foot of the sail, while the upper point is known as the head. ... Load is what is carried, or a force. ...

References

  • Edwards, Fred (1988). Sailing as a Second Language. Camden, ME: International Marine Publishing. ISBN 0-87742-965-0.
  • Hiscock, Eric C. (1965). Cruising Under Sail. Oxford University Press. ISBN 0-19-2175222-X.
  • Marino, Emiliano (1994). The Sailmaker's Apprentice: A guide for the self-reliant sailor. Camden, ME: International Marine Publishing. ISBN 0-07-157980-X.



  Results from FactBites:
 
Buchanan and Shackle on Cost and Choice (6271 words)
Shackle was both directly and indirectly associated closely with the London group.
Shackle reviewed a couple of Robbins’ books and there is evidence that he read carefully a 1938 paper by Robbins on methodology (and mysteriously deemed it "very badly spelt").
White also expressed concern that Shackle was, in effect, reducing courses of action to single values at the final stage of decision, by characterising each action in terms of the numerical difference between focus gain and loss, and then comparing these differences and choosing the action with the greater difference.
shackle - definition by dict.die.net (258 words)
Shackled by her devotion to the king, she seldom could pursue that object.
Something which confines the legs or arms so as to prevent their free motion; specifically, a ring or band inclosing the ankle or wrist, and fastened to a similar shackle on the other leg or arm, or to something else, by a chain or a strap; a gyve; a fetter.
Shackle joint (Anat.), a joint formed by a bony ring passing through a hole in a bone, as at the bases of spines in some fishes.
  More results at FactBites »


 

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