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A Hirth joint or Hirth coupling is a type of mechanical connection named after its developer Albert Hirth. It is used to connect two pieces of a shaft together and is characterized by tapered teeth that mesh together on the end faces of each half shaft. Face spline joints aren't Hirth joints. They have a different geometry.
EMT-CC - Emergency Medical Technician - Critical Care [citation needed] EMT-CT - Emergency Medical Technician - Cardiac Tech [citation needed] EMT-M - Emergency Medical Technician - MAST (Military Anti-Shock Trousers) EMT-T - Emergency Medical Technician - Tactical [10] EMT-ST - Emergency Medical Technician - Shock Trauma [citation needed]
Pipe coupling (copper sweat) In piping and plumbing , a coupling (or coupler ) is a very short length of pipe or tube , with a socket at one or both ends that allows two pipes or tubes to be joined, welded ( steel ), brazed or soldered ( copper , brass etc.) together.
A beam coupling, also known as helical coupling, is a flexible coupling for transmitting torque between two shafts while allowing for angular misalignment, parallel offset and even axial motion, of one shaft relative to the other. This design utilizes a single piece of material and becomes flexible by removal of material along a spiral path ...
In electronics, electric power and telecommunication, coupling is the transfer of electrical energy from one circuit to another, or between parts of a circuit. Coupling can be deliberate as part of the function of the circuit, or it may be undesirable, for instance due to coupling to stray fields .
This coupling is used by Spanish firefighters, and is defined by Spanish Standard UNE 23400. [15] It is a sexless coupling with three engaging lugs, and is available in several different sizes, including Barcelona 25 (25 mm hose ID), Barcelona 45 (45 mm hose ID), and Barcelona 70 (70 mm hose ID). Suitable for delivery (pressure) only, not suction.
Often, however, cross-coupling refers to a metal-catalyzed reaction of a nucleophilic partner with an electrophilic partner. Mechanism proposed for Kumada coupling (L = Ligand , Ar = Aryl ). In such cases, the mechanism generally involves reductive elimination of R-R' from L n MR(R') (L = spectator ligand ).
[2] [3] Some Russian locomotives and wagons have buffers together with the central coupler. When coupling to Finnish equipment, a short chain with a block that fits in the central coupler is placed on the Russian side, backing up and compressing the buffers so that the chain can be laid on the hook. (That is also the common way of coupling ...