Flat contact spring for plugs of electrical plug and socket conn

Details Flat contact spring for plugs of electrical plug and socket conn Flat contact spring for plugs of electrical plug and socket conn

1990-11-16

1991-12-17

Bradley, Paula A.

Electrical connectors

Contact terminal

29863, 29874, 29884, 439885, H01R 1304, H01R 1302

Patent

active

050731327

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a flat contact spring for plugs of electrical plug and socket connections, which has crimped projections for connecting electrical wires as well as a recess which supports a holder tongue attached to the spring housing with its border surfaces.
It is known that flat contact springs for plugs of electrical plug and socket connections can be formed of a relatively thick sheet metal material. Adaptation of the thickness of the flat contact springs to the clear width of the socket contacts therefore requires the use of sheet metal materials with a greater or lesser thickness. Aside from the fact that the flat contact springs formed in this way demonstrate only a slight bending momentum lateral to the plug direction and are therefore easy to bend unintentionally, the plugging process is also made difficult. In addition, the cutting steps prove to be difficult, due to the increasing thickness of the sheet metal materials.
It is the task of the invention to facilitate the cutting processes for flat contact springs, as well as to create measures for increasing stability and adapting thickness to various opening widths of socket contacts.
According to the invention, this task is accomplished in that a sheet metal blank with a first segment having a center strip and longitudinal strips which can be folded up onto this center strip is provided, the longitudinal border strips of which have cut-outs which connect with the border edges, which together form a recess provided with undercuts when the longitudinal border strips are folded onto the center strip, and a second segment having a center strip and longitudinal border strips which can be folded up onto this center strip is provided, the longitudinal border strips having hook-shaped notches, which engage with the recess of the longitudinal border strips of the first segment when the longitudinal border strips are folded onto the center strip, jointly creating a positive lock for holding the longitudinal border strips of the first and second segment in place. The doubling of the flat contact spring achieved with the folding processes of the longitudinal border strips makes it possible to use a thin sheet metal material which is easily cut for the flat contact spring, and results in strengthening of the flat contact spring with the bending edges, especially lateral to the contact spring plane. In addition, since the undercuts engage with each other due to the hook-shaped notches, the parts of the two segments that lie on top of each other are held in place.
It is understood that the contact spring can be made with the same thickness over its entire length and width. In forming the flat contact spring, the first segment can have impressions in the center of the center strip and on the same side of the border edges of the longitudinal border strips of that segment, which form groove-shaped crimps in the center, on both sides of the flat contact spring, when the longitudinal border strips are folded onto the center strip. The crimps exercise a guidance function during the plugging process and also allow interaction of the flat contact spring with sockets of different widths and opening sizes, with the possibility that contact takes place only via the areas of the crimps, or via the flat contact spring areas which extend next to the crimps.
Furthermore, it is provided that the second segment has a recess in the center of the center strip and the longitudinal border strips of the second segment have recesses in the areas of the border edges, with half the width of the recess of the center strip, and that when the longitudinal border strips are folded onto the center strip, their recesses form a recess with the same axis, together with the recess of the center strip, the border edges of which can be brought into action with spring tongues attached to the spring housing.
Furthermore, it is provided that the center strip and the longitudinal border strips of the first segment be limited at their free ends, in the plane of the segment and at the border

REFERENCES:
patent: 4030804 (1977-06-01), Enomoto
patent: 4979915 (1990-12-01), Pitts

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