![]() Various banana plug (type 274) products are shown in a September 1928 catalog and prices were listed in a July 1928 newsletter. The General Radio Company claims it introduced the banana plug in the United States in 1924.Not needing a small screw to hold the wire in place, like in conventional Bananensteckern (banana plugs), is presented as an advantage of the invention. The patent describes a banana plug that consists of two parts only. In 1929 Richard Hirschmann was granted a patent in Germany for an improved banana plug. The Hirschmann company claims it was invented by Richard Hirschmann in 1924.Invention of the plug is claimed by two entities: The plugs are frequently used to terminate patch cords for electronic test equipment such as laboratory power supply units, while sheathed banana plugs are common on multimeter probe leads. Common types include: a solid pin split lengthwise and splayed slightly, a tip of four leaf springs, a cylinder with a single leaf spring on one side, a bundle of stiff wire, a central pin surrounded by a multiple-slit cylinder with a central bulge, or simple sheet spring metal rolled into a nearly complete cylinder. Various styles of banana plug contacts exist, all based on the concept of spring metal applying outward force into the unsprung cylindrical jack to produce a snug fit with good electrical conductivity. The term 4 mm connector is also used, especially in Europe, although not all banana connectors will mate with 4 mm parts, and 2 mm banana connectors exist. Various laboratory-style 4 mm banana plugs Loudspeaker-style banana plugs connected to a loudspeaker Double-stackable banana plugs for junction into two additional parallel circuits.Ī banana connector (commonly banana plug for the male, banana socket or banana jack for the female) is a single- wire (one conductor) electrical connector used for joining wires to equipment.
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