Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1996-09-24
1998-09-01
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361760, 361772, 361773, 361776, 335202, 335278, H05K 700
Patent
active
058019308
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a printed circuit board relay having a base body, in which connecting elements which are cut from a sheet-metal panel are embedded essentially parallel to a base plane of the relay, which connecting elements project sideways from the base body and are bent downwards on its outer side in order to form push-in posts which are at right angles to the base plane.
2. Description of the Related Art
Such a relay has already been disclosed, in general form, in German Patent Document DE 34 30 589 C2. The push-in posts are in this case integrally formed on the contact elements of the relay simply by bending, the elastic push-in zone having limbs which are divided from one another and are pressed apart from one another by means of a longitudinal slot.
When solder-free contact is made with the relay via push-in posts on a printed circuit board, in order to ensure in addition that this contact-making is gastight and reliable, the push-in zone must be able to produce a specific contact pressure in the contact holes of the printed circuit board which, in turn, is predicated on a corresponding insertion force during assembly. In order now to make it possible to absorb and transmit this insertion force, the push-in posts according to the prior art indicated above require a specific minimum material thickness; otherwise, the risk exists that the push-in posts will be kinked by the insertion force. Since the connecting elements are normally formed integrally from the sheet-metal material of the contact elements, but the sheet-metal thickness of the contact elements is frequently very small in the case of miniature relays, for example being only 0.2 mm, the required stiffness is not directly ensured for push-in posts which are formed from this material.
German Patent Document DE-U-84 31 966 discloses a contact spring for electrical plug connector strips, whose connecting tab is designed in a V-shape in the insertion region, pushing-in shoulders being provided symmetrically on relatively small broadened regions of the two limbs. These pushing-in shoulders can transmit insertion forces reliably if the material thickness of the contact spring is adequate and the insertion tool can act relatively closely on both sides alongside the contact spring. These conditions are present in the case of plug connectors, but not in the case of a relay of the type mentioned initially.
U.S. Pat. No. 4,336,431 furthermore presents solder-free fixing of a spring sheet-metal element on a printed circuit board, spring elements which are in each case bent in a U-shape being secured by insertion into holes in the printed circuit board and by subsequent deformation by upsetting. These U-shaped spring elements admittedly have flaps bent in a groove shape on both sides and have push-in shoulders on their top, but they are not push-in posts in the actual sense, since the U-shaped spring elements do not make contact in the printed circuit board holes. Since the spring sheet-metal elements are used without any extrusion coating or housing enclosure, this design can also not be transferred to making contact with the switching contacts, which are embedded in a base body, of a relay.
SUMMARY OF THE INVENTION
An object of the present invention is to provide push-in posts in the case of a printed circuit board relay of the type mentioned initially such that, even with a small material thickness, they have adequate stiffness to produce the required contact pressure in the push-in zone, and such that the post itself can transmit the insertion force required for this purpose to the push-in zone.
This and other objects are achieved according to the invention in the case of a relay of the type mentioned initially in that the push-in posts are formed by sections which are bent in the form of sleeves or channels and are in each case linked on one side to that section of the respective connecting element which is bent downwards at right angles, having an axis which is at right angl
REFERENCES:
patent: 3783433 (1974-01-01), Kurtz et al.
patent: 4336431 (1982-06-01), Loose
Picard Leo P.
Siemens Aktiengesellschaft
Vu Phuong T.
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