BACKGROUND

The present invention relates to a high current terminal socket.

High current terminal sockets are for example known as radial terminal sockets or hyperbolic terminal sockets.

US 2002/0187686 A1 discloses a socket including a T-shaped connector and the production of a laminated contact consisting of a contact cage and a curled contact holder, which are twisted into an “hourglass shape” in a complex manner using various auxiliary means.

U.S. Pat. No. 4,657,335 A describes another socket which is formed by rotating the ends of a contact cage relative to each other into a sleeve. Annular rings are then slipped over the respective ends of the sleeve for fixing and fastening the contact cage in the sleeve.

An electrical connector comprising a substantially cylindrical sleeve with notches at its end faces for fastening a hyperbolically twisted contact cage with its contact blades on or in said notches is known from US 2003/0068931 A1.

Another electrical connector socket is known from DE 10 2011 105 821 B4. It discloses a cylindrical socket sleeve, wherein said sleeve is provided with a receiving space in which a hyperbolically twisted contact cage is attached and the socket sleeve has a first and a second end face, and wherein the contact cage with its contact blades is positively interlocked with the first and second end faces of the socket sleeve and wherein openings are provided in the transitional area between the socket sleeve and the contact blade and at least one of the contact blades of the contact cage projects through one of the openings.

However, all these solutions known from prior art have the disadvantage that the production of the terminal sockets takes a great effort, particularly because the geometrical dimensions and tolerances of sleeves and sleeve mesh or contact cage must be matched to one another, and there is an undesirable, production-related tolerance range which causes considerable practical assembly and application problems.

For simpler solutions, sleeves are alternatively produced in a rolling and bending process.

The “dovetail connections” known from prior art, which are used as connecting elements and molded to opposite side edges of a piece of sheet metal, make the production process expensive and are difficult to produce due to manufacturing tolerances. It is particularly necessary that the dovetail is exactly fitted into its respective mating contour to achieve stable support, and wherein a certain assembly clearance can lead to the end faces not being in flush alignment in the rolling and bending process, which creates an undesired step.

Such an exemplary dovetail connection is known, for example, from US 2002/0187686 A1. As explained above, producing a high-current contact element in accordance with the method shown there takes a great effort, is complicated and not economical. Furthermore, the desired exactly fitting end faces which would allow complete elimination of a sleeve enclosing the contact element are not achieved.

SUMMARY

It is therefore the problem of the present invention to overcome the disadvantages mentioned above and to manufacture a high-current terminal socket in a much simpler and more economical manner, wherein, on the one hand, the number of components can be reduced, and the desired manufacturing accuracy can be achieved on the other.

The invention is solved by a sheet metal part for forming a cylindrically shaped contact cage.

The invention is based on the concept that a sheet metal part which is preferably configured as a punched or bent part is provided, which part has a capturing geometry on side edges or side regions which guide the end-side edges of the contact cage to be formed into a desired, preferably completely flush position when the sheet metal part is formed into a contact cage.

According to the invention, respective capturing geometries in the form of protrusions and recesses which provide forced guidance into a contact cage during forming are provided on opposite side edges of the sheet metal part, which abut in its cylindrically shaped state.

According to the invention, a flat sheet metal part is provided for forming a cylindrically shaped contact cage with a receiving space for plugging in a contact in a plug-in direction Z, said sheet metal part comprising:a. a base shape with four edges and four corner sections, of which two of the edges extend parallel to one another and each form a collar crosspiece extending in each case between two corner section;b. a multitude of contact blades which connect the one collar crosspiece with the other (opposing) collar crosspiece,c. wherein each collar crosspiece comprises a protrusion which lengthens the collar crosspiece in the region of the respective corner section, andd. wherein each collar crosspiece has a recess in the region of the respective other corner section (that is, the opposing corner section), preferably a recess which matches the protrusion.

This has the advantage that the protrusion can plunge into the recess when the sheet metal part is bent or formed into a cylindrical contact cage shape and the edges of the protrusion form guide surfaces on the edge of the recess, which thus serve as a capturing geometry and force the contact cage into an overall desired final shape in which the end-side edges which run parallel to one another are in flush alignment, that is, without an offset in the plug-in direction.

Advantageously, the protrusion projects or protrudes from the corner section in the direction in which the collar crosspiece extends.

Further advantageously, the shape of the recess matches the shape of the protrusion, such that said protrusion projects into a cylindrically shaped contact cage when the sheet metal part is formed.

Further advantageously, the edge extends as follows in the region of the protrusion of the respective collar crosspiece: first linearly along the rim of the respective collar crosspiece, then in a curved manner around the respective protrusion in a bend of about 80° to 100°, preferably in a 90° bend.

Further advantageously, the curvature changes from the 180° bend into a curved bend of 90° in the opposite direction.

Further advantageously, the edges of the sheet metal part extend as follows in the region of the recess of the respective collar crosspiece: first linearly along the rim of the respective collar crosspiece, then in a curved manner in a bend of about 90° (in a first direction of curvature along the recess), then further in a bend of about 180° around while forming a protrusion.

The side edge of this latter protrusion can thus slide along the protrusion of the opposite corner section when the sheet metal part is formed into a cylindrically shaped contact cage.

Particularly advantageously, the edge comprises a linear oblique section in the region of the bend mentioned above, which section is directly opposite, or abuts with, a linear oblique section on the opposite edge in the region of the bend of about 90° which extends parallel to said first section.

In other words, the oblique sections mentioned above, which extend substantially parallel to each other and linearly, are provided in every corner section of the sheet metal part in the region of the capturing geometry and are used, on the one hand, for stiffening to avoid stress peaks, and on the other hand form exact abutment surfaces, which allows forming the sheet metal into a desired final shape at a minimal tolerance.

According to the invention, the protrusion further comprises an oblique section which extends about parallel to the linear oblique section of the edge in the region of the bend.

Another aspect of the present invention relates to a cylindrically shaped contact cage, which was formed from the sheet metal part mentioned above and forms a substantially cylindrically shaped receiving space which is constricted at its center.

Another aspect of the present invention relates to a sheet metal part as described above, which is characterized in that the protrusion next to the recess rests with its side edge that faces the rim in the region of the 90° bend against the opposite side edge of the protrusion.

It is further advantageous that the end-side opposite edge of this protrusion plunges into the recess, thereby forming an end-side gap.

In other words, the protrusion does not project to the opposite edge of the recess on its end side when the sheet metal part is rolled into a cylindrically shaped contact cage; instead, a gap is formed between the end-side edge on the protrusion and the edge on the recess.

