[0001] The invention relates to a press-fit contact produced as a turned part for establishing
an electrical connection, for example in a plated-through hole of a printed circuit
board, for plug-in connections or else as an attachment point for a soldered connection.
[0002] In the case of conventional press-fit contacts of said type, as even a contact pressure
as possible or an even contact-making over the entire region of contact between the
pressed-in contact and the surrounding contact medium is desired. Owing to production
inaccuracies and/or tolerances or else on account of not quite axially aligned pressing-in
of the contact, differing bearing pressures occur in the contact zone and consequently
partially differing current loading or wearing in the connection region between the
contact pin and the contact hole.
[0003] The invention is based on the object of improving press-fit contacts of said type
in such a way that an even bearing pressure and even contact-making are ensured over
the entire contact zone.
[0004] In the case of a press-fit contact made as a turned part, the invention comprises
that the pressing-in zone is shaped in the form of a barrel in its outer contour,
is designed cylindrically hollow on the inside and is provided with a plurality of
axially parallel longitudinal slits.
[0005] It is advantageous to design the lower, free edge of the press-fit contact, which
edge is to be inserted into the contact hole, in the form of a solid ring with peripheral
edge bevel.
[0006] An embodiment of the invention is explained below with reference to the drawing,
in which,
- Fig. 1
- shows a press-fit contact having features according to the invention, in greatly enlarged
representation, and
- Fig. 2
- shows on about half-scale, a cross-sectional representation of the press-fit contact
according to Fig. 1.
[0007] The press-fit contact 1 may be provided in its upper region with a peripheral cross-sectional
widening 3 with supporting shoulders 2 and at the upper end with an attachment stub
4, for example for producing a soldered contact, a contact pin or a contact spring.
In the region of the press-in zone 10, the press-fit contact 1 is, according to the
invention, shaped in the form of a barrel in its outer contour 8 and turned or drilled
out hollow-cylindrically in the inner region 9. The barrel-formed contour is interrupted
by a plurality of, for example four, axially parallel longitudinal slits 6.
[0008] However, the longitudinal slits 6 preferably do not run over the entire length of
the press-in zone 10, but only over a subregion, in such a way that an annular insertion
edge 5, which is provided on the outside with an insertion bevel 11, remains at the
lower, free end, the insertion region.
[0009] Due to the barrel-formed shaping of the press-in zone 6, on the one hand pressing-in
is made easier in conjunction with the insertion bevel 11. On the other hand, the
contact region 10 is loaded approximately evenly over its entire length in all cross-sectional
regions, the greatest diameter region lying in the region of the highest bending moment.
[0010] In accordance with the definition of the object, with the invention the pressing-in
of such press-fit contacts is made easier and a substantially even contact-making
over the entire press-in zone is achieved.
1. A press-fit contact produced as a turned part, wherein the press-in zone (6) is shaped
in the form of a barrel in its outer contour (8), is designed cylindrically hollow
on the inside and is provided with a plurality of axially parallel longitudinal slits
(6).
2. The press-fit contact as claimed in claim 1, wherein the longitudinal slits (6) run
only over a subregion of the press-in zone (10), in such a way that there is an insertion
edge (5) in the form of a solid ring at the free end of the press-in zone.
3. The press-fit contact as claimed in claim 2, wherein the insertion edge (5) in the
form of a solid ring has an insertion bevel (11) on the outside.
