Spring bushing for miniature plug-in connectors having contact spring with insertion depth equal to or less than insertion width

1. A spring bushing for a miniature plug-in connector comprising:

(a) a bushing housing having at least one housing chamber;

(b) a one-piece contact spring received in said at least one housing chamber, said contact spring comprising first and second outer contact-providing spring tongues and a center contact-providing spring tongue bent out at least on one side of a flat sheet-metal punched part, said sheet-metal punched part comprising a first end and a second free end, said first end comprising a crosspiece carrying said spring tongues, said crosspiece forming a fixed connector, said outer contact-providing spring tongues being narrower in width than said center contact-providing spring tongue and being bent out from the crosspiece in a direction opposite from the center contact-providing spring tongue; and

(c) a plurality of guide ribs carried on an outside portion of said contact spring proceeding from said crosspiece, said ribs positioning the contact spring in said at least one housing chamber;

wherein the contact spring has an insertion depth and an insertion width for a contact blade, said insertion depth being less than or equal to said insertion width.

2. The spring bushing according to claim 1 , wherein the guide ribs in width are narrower than the outer contact-providing spring tongues.

3. The spring bushing according to claim 2 , wherein the guide ribs are shorter than the contact-providing spring tongues and lie in a plane with the crosspiece.

4. The spring bushing according to claim 1 , wherein the fixed connector comprises surface mount device (SMD) contacts.

5. The spring bushing according to claim 1 , wherein the bushing housing carries a plurality of shielding plates, at least one of said shielding plates being on a side of the bushing housing opposite to another of said shielding plates.

6. The spring bushing according to claim 5 , wherein the shielding plates comprise snap-on attachment devices for the bushing housing.

7. The spring bushing according to claim 5 , wherein the shielding plates are attached to a circuit board or card using SMD technology.

8. The spring bushing according to claim 1 , further comprising a plurality of positioning pins provided on the bushing housing for a circuit board.

9. The spring bushing according to claim 8 , wherein the positioning pins are configured differently for the purpose of “incorrect poling” of the spring bushing.

10. The spring bushing according to claim 1 , wherein the spring bushing has multiple poles.