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This is an accepted version of this page This is the latest accepted revision, reviewed on 21 January 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors, cupboard ...
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 ]
ISO 3076:2012 Round steel short link chains for general lifting purposes — Medium tolerance sling chains for chain slings — Grade 8; ISO 3077:2001 Short-link chain for lifting purposes — Grade T, (types T, DAT and DT), fine-tolerance hoist chain; ISO 3078:2016 Shipbuilding — Cargo winches
Crank length is measured from the center of the pedal spindle to the center of the bottom bracket spindle or axle. The larger bicycle component manufacturers typically offer crank lengths for adult riders from 165 to 180 mm (6.5 to 7.1 in) long in 2.5 mm (0.098 in) increments, with 170 mm (6.7 in) cranks being the most common size.
A machine tool may have several spindles, such as the headstock and tailstock spindles on a bench lathe. The main spindle is usually the biggest one. References to "the spindle" without further qualification imply the main spindle. Some machine tools that specialize in high-volume mass production have a group of 4, 6, or even more main spindles.
[7] [8] [9] He published a description in 1678, [10] resulting in the use of the term Hooke's joint in the English-speaking world. In 1683, Hooke proposed a solution to the nonuniform rotary speed of the universal joint: a pair of Hooke's joints 90° out of phase at either end of an intermediate shaft, an arrangement that is now known as a type ...