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Modern manual door closer Eclipse door spring and separate checking mechanism. A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior.
Ingo-bike. Although several patents for eccentric-hub cycles exist from 1928, [1] [2] the most popular incarnation was patented in 1934 by brothers Phillip and Prescott Huyssen and called the "Exercycle". [3] It was produced by the Ingersoll Steel & Disc Co. (a division of Borg-Warner Corp.), from 1934 to 1937, under the name "Ingo-bike". A ...
Door chain. A door chain, security chain, or security door chain or chain door interviewer [1] consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door. [2] They are commonly used on hotel and motel ...
It consists of a hinged, box-like assembly locked over the handcuff chain, wristlets and keyholes. [1] The first handcuff cover was invented by J. D. Cullip and K. E. Stefansen [2] and patented in 1973. [3] It is made from high-strength, high-impact ABS plastic [4] and is still distributed by C & S Security Inc. as "Black Box" handcuff cover. [5]
30 Series - Model 39 (1942–1945) G551 or G672 - motor scooter, package delivery 3-wheel 50 Series - Model 52 (1946–1948) 50 Series - Model 52A (1946–1948)
Planar quadrilateral linkage, RRRR or 4R linkages have four rotating joints. One link of the chain is usually fixed, and is called the ground link, fixed link, or the frame. The two links connected to the frame are called the grounded links and are generally the input and output links of the system, sometimes called the input link and output link.
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Many riders also fit aftermarket chain-oilers to feed a regular supply of oil to the chain at the rear sprocket. [8] These chain oilers vary in sophistication, but all add significantly to the life of the chain. The custom of lubing by immersing the chain in a tin of hot grease ceased in the early 1970s, once most chains had rubber "O'-rings.
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