Electrical connectors – Metallic connector or contact having movable or resilient... – Spring actuated or resilient securing part
Patent
1989-10-16
1991-02-12
McGlynn, Joseph H.
Electrical connectors
Metallic connector or contact having movable or resilient...
Spring actuated or resilient securing part
439884, H01R 1300
Patent
active
049920642
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flat contact spring for plugs of electric plug connectors with socket bodies having socket contacts.
The known flat contact springs for plugs are formed by plane sheet metal cut to size, whereby a contact spring tongue, the latter being pluggable in the socket contact of a socket body, is linked up with crimp attachments for fixing the electric connection cables and their insulation. With the known flat contact springs, the contact spring tongue is formed by a relatively thick metal sheet material as a solid body. Aside from the fact that thick metal sheet sections are difficult to cut, adaptation of the thickness of the contact spring tongue to the inside diameter of the openings of socket contact can be accomplished only by using more or less thick metal sheet materials. In addition, the contact spring tongues so formed have a very low bending moment, which means they are often unintentionally buckled, which has an unfavorable bearing on the plugging processes of such flat contact springs.
The problem of the invention is to make the cutting process safer with flat contact springs and to create simple measures for increasing the stability and adaptation of the contact spring tongue to the inside diameter of the openings of socket contacts.
According to the invention, said problem is resolved by means of a metal sheet cut having a center strip and crimp attachments embodied with an axial spacing from said center strip, as well as lateral strips arranged on both sides of the center strip, said side strips being foldable onto the latter and having substantially half of the width of the center strip.
By doubling the flat contact spring within the zone of the contact spring tongue it is now possible to use a thin metal sheet material that can be easily cut, while the bending edges of the lateral strips lead to prestrengthening.
In the embodiment of the contact spring, the center strip has two impressions extending parallel next to each other in the longitudinal direction, and each of the lateral strips has the same impression, in a way such that when the lateral strips are folded against the center strip, the impressions of the latter and of the lateral strips are disposed on top of each other, in each case forming chambers which are closed all around. By selecting suitable depths for the impressions, the latter permit adaptation of the contact spring tongue to any thickness, and the bending moment is increased by the boundary surfaces of the impressions, said surfaces extending transversely to the plane of the contact spring tongues, which prevents buckling of the contact spring tongue and wrong plugging caused by such deformation.
Furthermore, provision is made that the center strip and the two lateral strips have bevels on the outside of the free ends, such bevels extending sloped relative to each other. Such bevels may be produced by grinding or noncutting deformation, for example by pressing, forming blades linked up with bevelled surfaces between the center strip and the lateral strips folded onto the latter, which bevelled surfaces facilitate the insertion of the contact spring tongue in socket contacts.
It is understood that the lateral strips may be freely folded onto the center strip. However, according to a preferred embodiment, the free ends of the center and lateral strips are rigidly joined with each other, for example by welding, soldering or glueing. Such rigid connection is usefully produced within the zone of the common plane of separation of the two lateral strips. Such fixing of the strip parts on each other prevents undesirable buckling or bending of said strip parts.
Finally, provision is made that an edge strip is cut on the metal sheet cut at the end facing the crimp attachments, said edge strip having additional metal sheet cuts arranged thereon. The edge strip facilitates the handling of the metal sheet cuts especially across the duration of the stamping and bending operations, or of other treatments, for example galvanic metal depositing. The flat contact s
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Bieringer Anton
Steinhardt Helmut
McGlynn Joseph H.
TRW Daut & Rietz GmbH & Co. KG
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