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These may include plugs with insulated sleeves, recessed sockets, sockets with blocking shutters, and sockets designed to accept only compatible plugs inserted in the correct orientation. The term plug is in general and technical use in all forms of English, common alternatives being power plug, [1] electric plug, [2] and (in the UK) plug top. [3]
The MVG Class A of the Munich U-Bahn uses sliding plug doors.. Many passenger trains in the world use sliding plug doors: early examples of passenger trains using plug doors include the MVG Class A of the Munich U-Bahn from 1967, [3] the first batch of trains for Line 2 of the Milan Metro from 1970, [4] and the DT1 of the Nuremberg U-Bahn, also from 1970.
AC power plugs are also commonly circular, for example, Schuko plugs and IEC 60309. NMEA 2000 cabling using M12 connectors. The M12 connector, specified in IEC 61076-2-101, is a circular electrical plug/receptacle pair with 12mm OD mating threads, used in NMEA 2000, DeviceNet, IO-Link, some kinds of Industrial Ethernet, etc. [16] [17]
Numerous devices exist to serve specific purposes related to how a door should (or should not) be used. See: Door chain - A device to secure door opening; Door closer – Mechanical or electromagnetic device to close an open door (in the event of a fire) [3] Door opener - Automatic door opening device activated by motion sensors or pressure pads
Figure 1 of the original patent for the molly bolt, U.S. Patent No. 2,018,251. The molly bolt was patented in 1934 by George Frederick Croessant. [3] Although his patent acknowledges that expandable fasteners of this general kind were already known, Croessant's patent is intended to provide "an improved and adequate anchoring grip that may be retightened if necessary and that will permit ...
Conrad Totman argues that deforestation was a factor in the style changes, including the change from panelled wooden sliding doors to the lightweight covered-frame shoji and fusuma. [ 100 ] A core part of the style was the shoin ("library" or "study"), a room with a desk built into an alcove containing a shoji window, in a monastic style; [ 94 ...