Abstract: A plug-in contact element, which is fabricated from a sheet metal stamping for receiving a post-like plug-in contact pin having four sides has a basic contact member provided with a rear connecting region, a central base region and a front contact region linked together one behind another in a one piece construction along a longitudinal axis, the central base region having a box shaped configuration, and the front contact region including contact spring arms for contacting the sides of the plug-in contact pin. A rectangular sleeve is arranged around the central base region and the front contact region so that the contact spring arms are protectively disposed within the rectangualr sleeve. A polarization plate and a latching spring arm project outwardly from a sleeve top wall of the rectangular sleeve.

Abstract: The invention pertains to an electrical contact element composed of a perforated piece of sheet metal that has a connection region (3) for an electrical connection on one end and a contact region (2) with a polygonal cross-sectional spring-arm base (7) with smooth walls on the other end, where to form a contact casing (1) with a polygonal plug hole (15) defining the contact sites, at each of the front edges of the walls of the spring arm base (7) turned away from the connection area (3), at least one spring arm (14) extending in the direction of the plug hole (15) is provided; the spring arms (14) extend toward each other as far as the plug hole (15) and form it, and then are bent away at an angle to the outside to form a positioning funnel (10) for a contact plug pin in the front free end region.

Abstract: An electrical contact element including a perforated piece of sheet metal that has on one end a connection region (3) for an electrical connection and on the other end a contact region (2) with a polygonal cross-sectional spring-arm base (7) with smooth walls. The walls of the spring arm base have front edges in the direction facing away from the connection region, from which extend at least one spring arm to form a contact casing with a polygonal plug hole defining contact sites. The spring arms extend toward each other as far as the location of the plug hole to form that hole, and then are bent away at an angle to the outside to form a positioning funnel for a contact plug pin in the front free end region of the spring arms.

Abstract: An external connector with an additional lock for a multipolar electrical coupling.

Abstract: A double flat spring contact provided with an over-spring, in which the double flat spring contact includes connecting elements for an electrical conductor wire and a box-shaped spring arm base which is rectangular in cross section to define a bottom, side walls and a pair of longitudinally divided top cover parts. A spring arm extends forward from each cover part and a pair of spring arms are also connected to the bottom. An external over-spring is seated about in an enclosed arrangement on the spring arm base to be unreleasably secured thereon. The external over-spring includes a box-shaped external over-spring arm base, which is also rectangular in cross section. Connected to and extending forward from the over-spring arm base are over-spring clamp arms that run parallel to the spring arms of the double flat spring contact. The clamp arms press inwardly upon outer surfaces of the spring arms.