Telefonaktiebolaget Lm Ericsson (publ)

Stig A Arvidsson

Bo Uno Henningsson

Kaj Tommy Näsström

Carl Rutger Bladh

Annette Malmros, Legal Representative

The present invention relates to a method of securing a reliable electrical contact between two adjacent surfaces by means of a contact spring () of a contact spring assembly (). The secure and reliable contact is achieved by providing excellent conditions for maintaining the contact spring fully operable at all times and is accomplished by providing a shelter () for the contact spring () on a carrier () therefore, thereby protecting the contact spring by eliminating the possibility of the contact spring being overloaded and plastically deformed during installation.

Contact spring assembly

A contact spring for securing a component having a flange-like edge to a substrate, for instance for securing a cooling screen or shield to a circuit board, includes an elongated profiled part that is generally U-shaped in cross section for surface-mounting on the substrate. A first leg of the U-shaped profiled part is substantially straight and extends continuously along the contact spring. The second leg of the U-shaped profiled part has tongues whose upper extremities are bent inwardly towards the bottom of the profiled part. Alternate tongues on the second leg are angled to form a fork-like contact with the first leg. The other tongues on the second leg are semicircular and extend approximately half way above the bottom of the profiled part.

Contact spring

An arrangement for shielding and/or cooling electronic components mounted on a circuit board includes a generally planar shielding hood and cooling elements. The shielding hood has downward extending side edges that extend around the perimeter and are intended to surround the component. Each cooling element has a generally planar underside and cooling fins disposed on the upper side. The arrangement also includes hook fasteners mounted on the surface of the circuit board and holders mounted on the cooling elements that coact with the hook fasteners. The hook fasteners press the cooling elements resiliently against the shielding hood and against the component. The holders can be brought into resilient, spring engagement with the hook fasteners. The shielding hood is adapted to the component, and when the component is to be shielded, the shielding hood is placed over the component. The cooling element is also adapted to the component, and when the component is to be cooled, the cooling element is placed either on the component or on the shielding hood over the component.

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Tyres o, Sweden

Stig A Arvidsson