Coupler

Coupler may refer to:

• 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

• 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

• Coupler (piping), also called a (joist) short length of pipe with two female threads
• Coupler, a device used on a pipe organ or harpsichord to allow a player to play multiple divisions at once, by means of "coupling" a division to another at either sub, super, or octave pitches
• 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

• Coupling (disambiguation)
• Decoupling (disambiguation)