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14-633: A pin is a device used for fastening objects or material together. Pin or PIN may also refer to: Pin According to their function, pins can be made of metals (e.g. steel , copper , or brass ), wood, or plastic . Pins have been found at archaeological sites dating as early as the Paleolithic , made of bone and thorn , and at Neolithic , Celtic and Ancient Roman sites. Neolithic sites are rich in wooden pins, and are still common through Elizabethan times. Metal pins dating to

28-441: A spiral pin , is a self retaining engineered fastener manufactured by roll forming metal strip into a spiral cross section of 2 + 1 ⁄ 4 coils. Coiled spring pins have a body diameter larger than the recommended hole diameter and chamfers on both ends to facilitate starting the pin into the hole. The spring action of the pin allows it to compress as it assumes the diameter of the hole. When coiled spring pins are installed,

42-476: A bent pin with a spring and guard. He sold the rights to his invention to pay a debt to a friend, not knowing that he could have made millions of dollars. The push pin was invented in 1900 by Edwin Moore and quickly became a success. These pins are also called "map pins" and are distinguished by having an easy to grip head. See also drawing pin or thumb tack. Thin, hardened pins can be driven into wood with

56-523: A gear and shaft—and even as ejector pins to remove motherboards from PCs. The automotive and electrical industries use coiled pins in such products as steering boxes and columns, pumps, electric motors and circuit breakers. Slotted spring pins are cylindrical pins rolled from a strip of material with a slot to allow the pin to have some flexibility during insertion. Slotted spring pins are also known as roll pins , sellock pins or "C" pins. These are also often referred to as spirol pins - pronounced ‘spiril’ in

70-487: A good pin. Adam Smith described the manufacture of pins as part of his discussion about the division of labor in the Wealth of Nations . John Ireland Howe invented a pin-making machine in 1832, and an improved machine in 1841; his Howe Manufacturing Company of Derby, Connecticut, used three machines to produce 72,000 pins per day in 1839. Walter Hunt invented the safety pin by forming an eight-inch brass pin into

84-472: A hammer with the goal of not being seen. In engineering and machine design, a pin is a machine element that secures the position of two or more parts of a machine relative to each other. A large variety of types has been known for a long time; the most commonly used are solid cylindrical pins, solid tapered pins, groove pins, slotted spring pins and spirally coiled spring pins . Coiled spring pins A spring pin (also called tension pin or roll pin )

98-464: A variety of combinations of strength, flexibility and diameter to suit different mating host materials and performance requirements. Typical materials for coiled spring pins include high carbon steel, stainless steel and alloy 6150. Coiled pins are used extensively in cosmetic cases, automotive door handles and locks, and latches as hinge pins. They are also used as pivots and axles, for alignment and stopping, to fasten multiple components together—such as

112-413: Is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole. The spring action of the pin allows it to compress as it assumes the diameter of the hole. The force exerted by

126-520: The Bronze Age have been found in Asia, North Africa and Europe, like the hammer-headed pins from the kurgan burials in the northeastern Caucasus . The development of the pin closely paralleled that of its perforated counterpart, the needle . Archaeological evidence suggests that curved sewing pins have been used for over four thousand years. Originally, these were fashioned out of iron and bone by

140-535: The Sumerians and were used to hold clothes together. Later, pins were also used to hold pages of books together by threading the needle through their top corner. Many later pins were made of brass, a relatively hard and ductile metal that became available during the Bronze Age . This development was followed by the use of steel which was much stronger but tended to rust when exposed to humid air. The development of inexpensive electroplating techniques allowed

154-461: The compression starts at the outer edge and moves through the coils toward the center. Coiled pins continue to flex after insertion when a load is applied to the pin thus providing excellent performance to counter fatigue in dynamic applications. Coiled spring pins were invented by Herman Koehl circa 1948. Coiled pins are commercially available in three different duties, standard (ISO 8750), heavy (ISO 8748) and light duty (ISO 8751), which provide for

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168-464: The pin against the hole wall retains it in the hole, therefore a spring pin is considered a self retaining fastener. Spring pins may be used to retain a shaft as a journal in a plain bearing , as a type of key to fasten one shaft to another, or to precisely fasten flat faces of mating parts together through symmetric hole locations. There are two types of spring pins: slotted spring pins and coiled spring pins . A coiled spring pin, also known as

182-465: The steel to be plated with nickel . Nickel did not rust, but tended to flake off the steel in humid weather, again allowing it to rust. However, this took many months or even years to happen, and as nickel plated steel pins were usually used only temporarily to hold cloth in place prior to sewing, no further refinement has been considered necessary. However, some modern specialty pins are made out of rust-proof and very strong titanium . A pinners guild

196-655: Was first established in London in 1356, spreading to other towns, but falling short of the quality produced by French pinmakers, discussed in the Art de l'épinglier ( French : Art de l'épinglier , lit.   'Pin art') (1761) where Henri-Louis Duhamel du Monceau gives details about the division of labor used by French pinmakers: There is nobody who is not surprised of the small price of pins; but we shall be even more surprised, when we know how many different operations, most of them very delicate, are mandatory to make

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