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Turnbuckle
A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one screwed into each end of a small metal frame, one with a left-hand thread and the other with a right-hand thread. The tension can be adjusted by rotating the frame, which causes both eye bolts to be screwed in or out simultaneously, without twisting the eye bolts or attached cables. Uses Turnbuckles are most commonly used in applications which require a great deal of tension; they can range in mass from about ten grams for thin cable used in a garden fence, to thousands of kilograms for structural elements in buildings and suspension bridges. Aircraft Turnbuckles have been used in aircraft construction, especially during the early years of aviation. Historically, biplanes might use turnbuckles to adjust the tension on structural wires bracing their wings. Turnbuckles are als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turnbuckle
A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one screwed into each end of a small metal frame, one with a left-hand thread and the other with a right-hand thread. The tension can be adjusted by rotating the frame, which causes both eye bolts to be screwed in or out simultaneously, without twisting the eye bolts or attached cables. Uses Turnbuckles are most commonly used in applications which require a great deal of tension; they can range in mass from about ten grams for thin cable used in a garden fence, to thousands of kilograms for structural elements in buildings and suspension bridges. Aircraft Turnbuckles have been used in aircraft construction, especially during the early years of aviation. Historically, biplanes might use turnbuckles to adjust the tension on structural wires bracing their wings. Turnbuckles are als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mechanical Joint
A mechanical joint is a section of a machine which is used to connect one or more mechanical part to another. Mechanical joints may be temporary or permanent, most types are designed to be disassembled. Most mechanical joints are designed to allow relative movement of these mechanical parts of the machine in one degree of freedom, and restrict movement in one or more others. Pin A pin joint, also called a revolute joint, is a one- degree-of-freedom kinematic pair. It constrains the motion of two bodies to pure rotation along a common axis. The joint doesn't allow translation, or sliding linear motion. This is usually done through a rotary bearing. It enforces a cylindrical contact area, which makes it a lower kinematic pair, also called a full joint. Prismatic A prismatic joint provides a linear sliding movement between two bodies, and is often called a slider, as in the slider-crank linkage. A prismatic pair is also called as sliding pair. A prismatic joint can be formed w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fly System
A fly system, or theatrical rigging system, is a system of rope lines, blocks (pulleys), counterweights and related devices within a theater (structure), theater that enables a stage crew to fly (hoist) quickly, quietly and safely components such as curtains, lights, theatrical scenery, scenery, stage effects and, sometimes, people. Systems are typically designed to fly components between clear view of the audience and out of view, into the large opening, known as the fly loft, above the stage (theatre), stage. Fly systems are often used in conjunction with other theatre systems, such as scenery wagons, stage lifts and stage turntables, to physically manipulate the mise en scène. Theatrical rigging is most prevalent in proscenium theatres with stage houses designed specifically to handle the significant dead and live loads associated with fly systems. building code, Building, Occupational Safety and Health Administration, occupational safety, and Fire safety#Fire code, fire cod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Professional Wrestling Attacks
Strikes are offensive moves in professional wrestling, that can sometimes be used to set up an opponent for a hold or for a throw. There are a wide variety of strikes in pro wrestling, and many are known by several different names. Professional wrestlers frequently give their finishers new names. Occasionally, these names become popular and are used regardless of the wrestler performing the technique. Professional wrestling contains a variety of punches and kicks found in martial arts and other fighting sports; the moves listed below are more specific to wrestling itself. Many of the moves below can also be performed from a raised platform (the top rope, the ring apron, etc.); these are called aerial variations. Moves are listed under general categories whenever possible. Body press A maneuver that involves a wrestler attacking with the core of the body. It is executed from an upright, running position using momentum and weight to run over the opponent. Body avalanche The wrest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guy-wire
A guy-wire, guy-line, guy-rope, or stay, also called simply a guy, is a tensioned cable designed to add stability to a free-standing structure. They are used commonly for ship masts, radio masts, wind turbines, utility poles, and tents. A thin vertical mast supported by guy wires is called a guyed mast. Structures that support antennas are frequently of a lattice construction and are called " towers". One end of the guy is attached to the structure, and the other is anchored to the ground at some distance from the mast or tower base. The tension in the diagonal guy-wire, combined with the compression and buckling strength of the structure, allows the structure to withstand lateral loads such as wind or the weight of cantilevered structures. They are installed radially, usually at equal angles about the structure, in trios and quads. As the tower leans a bit due to the wind force, the increased guy tension is resolved into a compression force in the tower or mast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrestling Ring
A wrestling ring is the stage on which a professional wrestling match usually occurs. It is similarly constructed to a boxing ring and is traditionally square-shaped. Configuration and construction The configuration and construction of the traditional wrestling ring closely resembles that of a boxing ring. Like boxing rings, wrestling rings are also known by the poetic name of the "squared circle", which derives from how combative exhibitions would often be held in a roughly drawn circle on the ground. Wrestling rings are generally composed of an elevated steel beam and wood plank stage topped by foam padding and a canvas cover. Around the ring are three ''ring ropes'', one fewer than modern boxing rings, which have had four ropes since the 1970s. The materials used for the ropes differ depending on the ring builder or promotion. Some, like WWE, use natural fiber ropes wrapped in tape, while others use steel cables that are encased in rubber hose. Unlike a boxing ring, the ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rigging
Rigging comprises the system of ropes, cables and chains, which support a sailing ship or sail boat's masts—''standing rigging'', including shrouds and stays—and which adjust the position of the vessel's sails and spars to which they are attached—the ''running rigging'', including halyards, braces, sheets and vangs. Etymology According to the Encyclopædia Britannica Eleventh Edition "rigging" derives from Anglo-Saxon ''wrigan'' or ''wringing'', "to clothe". The same source points out that "rigging" a sailing vessel refers to putting all the components in place to allow it to function, including the masts, spars, sails and the rigging. Types of rigging Rigging is divided into two classes, '' standing'', which supports the mast (and bowsprit), and ''running'', which controls the orientation of the sails and their degree of reefing. Configurations differ for each type of rigging, between ''fore-and-aft rigged'' vessels and '' square-rigged'' vessels. Standing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buffers And Chain Coupler
Buffers and chain couplers (also known as "buffers and screw", "screw", "screwlink", and "English" couplers) are the de facto UIC standard railway stock coupling used in the EU and UK, and on some surviving former colonial railways, such as in South America and India, on older rolling stock. Buffers and chain couplers are an assembly of several devices: buffers, hooks and links, or turnbuckle screws. On the modern version of the couplers, rail vehicles are mated by manually connecting the end link of one chain which incorporates a turnbuckle screw into the towing hook of the other wagon, drawing together and slightly compressing the buffer pairs, one left and one right on each headstock. That limits slack, and lessens shunting shocks in moving trains. By contrast, vehicles fitted with the semi-automatic Janney Type E coupler can experience significant jarring during mating and shunting. Very early rolling stock had "dummy buffers", which were simple rigid extensions of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volkmann's Contracture
Volkmann's contracture is a permanent flexion contracture of the hand at the wrist, resulting in a claw-like deformity of the hand and fingers. Passive extension of fingers is restricted and painful. Causes Any fracture in the elbow region or upper arm may lead to Volkmann's ischemic contracture, but it is especially associated with supracondylar fracture of the humerus. It is also caused by fractures of the forearm bones if they cause bleeding from the major blood vessels of the forearm. The condition may be caused by obstruction on the brachial artery near the elbow, possibly from improper use of a tourniquet, improper use of a plaster cast, or compartment syndrome. Pathophysiology Volkmann's contracture results from acute ischaemia and necrosis of the muscle fibres of the flexor group of muscles of the forearm, especially the flexor digitorum profundus and flexor pollicis longus. The muscles become fibrotic and shortened. Prevention Prevention of the condition requires rest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Film
A film also called a movie, motion picture, moving picture, picture, photoplay or (slang) flick is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, feelings, beauty, or atmosphere through the use of moving images. These images are generally accompanied by sound and, more rarely, other sensory stimulations. The word "cinema", short for cinematography, is often used to refer to filmmaking and the film industry, and to the art form that is the result of it. Recording and transmission of film The moving images of a film are created by photography, photographing actual scenes with a movie camera, motion-picture camera, by photographing drawings or miniature models using traditional animation techniques, by means of computer-generated imagery, CGI and computer animation, or by a combination of some or all of these techniques, and other visual effects. Before the introduction of digital production, series of still imag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theatre
Theatre or theater is a collaborative form of performing art that uses live performers, usually actors or actresses, to present the experience of a real or imagined event before a live audience in a specific place, often a stage. The performers may communicate this experience to the audience through combinations of gesture, speech, song, music, and dance. Elements of art, such as painted scenery and stagecraft such as lighting are used to enhance the physicality, presence and immediacy of the experience. The specific place of the performance is also named by the word "theatre" as derived from the Ancient Greek θέατρον (théatron, "a place for viewing"), itself from θεάομαι (theáomai, "to see", "to watch", "to observe"). Modern Western theatre comes, in large measure, from the theatre of ancient Greece, from which it borrows technical terminology, classification into genres, and many of its themes, stock characters, and plot elements. Theatre artist Patr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boxing Ring
A boxing ring, often referred to simply as a ring or the squared circle, is the space in which a boxing match occurs. A modern ring consists of a square raised platform with a post at each corner. Four ropes are attached to the posts and pulled parallel under tension with turnbuckles to form the boundary of the competition area. Construction As there are a number of professional boxing organizations, the standards of construction vary. A standard ring is between to a side between the ropes with another outside. The platform of the ring is generally from the ground and is covered by about of padding topped by stretched canvas. The ropes are approximately in diameter and at heights of 18, 30, 42, and 54 inches (.46, .76, 1.07, and 1.37 m) above the mat, held up on posts rising around above the mat. The ropes are attached together with spacers that prevent them from spreading too far apart. Construction of the ring environment extends to maximization of lighting in the r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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