{{wiktionary}} '''Coupler''' may refer to: {{TOC right}} ==Engineering== ===Mechanical=== * Railway coupler, a mechanism for connecting rolling stock on a train ** Janney coupler ** SA3 coupler ** Scharfenberg coupler for multiple unit passenger cars * Quick coupler, used in construction machines to allow the rapid change of buckets * Coupling, a device used to connect two shafts together at their ends for the purpose of transmitting power ** Universal coupling, a joint or coupling in a rigid rod that allows the rod to 'bend' in any direction
===Electronics=== * Acoustic coupler, for coupling electrical signals by acoustical means * Directional coupler, a passive device used in radio technology * Antenna coupler, a device connected between a radio transmitter or receiver and its antenna * Output coupler, a partially reflective mirror used in lasers * Optocoupler, an electronic component that transfers electrical signals between two isolated circuits by using light
==Other uses== * Coupler (piping), also called a (joist) short length of pipe with two female threads * Coupler, a device used on a pipe organ * Coupler, a device used on a harpsichord * Coupler, a tap valve, for controlling the release of beer out of a keg * Coupler, the floating link in a four-bar linkage * Hydrant coupler, for aircraft fueling equipment
==See also== * Coupling (disambiguation) * Decoupling (disambiguation)
{{disambiguation}}