Swivel
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A swivel is a connection that allows the connected object, such as a gun or chair to rotate horizontally and/or vertically. A common design for a swivel is a cylindrical rod that can turn freely within a support structure. The rod is usually prevented from slipping out by a nut, washer or thickening of the rod. The device can be attached to the ends of the rod or the center. Another common design is a sphere that is able to rotate within a support structure. The device is attached to the sphere. A third design is a hollow cylindrical rod that has a rod that is slightly smaller than its inside diameter inside of it. They are prevented from coming apart by flanges. The device may be attached to either end.
A swivel joint for a pipe is often a threaded connection between in which at least one of the pipes is curved, often at an angle of 45 or 90 degrees. The connection is tightened enough to be water or air tight and then tightened further so that it is in the correct position.
A swivel is a device on a fishing line allowing the lure or a hook to rotate separately from the line, thus reducing the risk of line snapping or entanglement due to excessive twisting of the fishline.
