Browse Prior Art Database

Soldering Contacts

IP.com Disclosure Number: IPCOM000092526D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Schurtz, J: AUTHOR

Abstract

By this method, spring contacts are soldered onto small printed circuit cards, using the Joule effect. The device, used to perform the operation, is a spot welding machine.

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Soldering Contacts

By this method, spring contacts are soldered onto small printed circuit cards, using the Joule effect. The device, used to perform the operation, is a spot welding machine.

After tinning the card tabs, the soldering operation is carried out with the aid of a jig. In the latter, spring contacts are maintained in the required positions on both sides of the card by guide pins. In this position, the spring contacts are always assembled by their common connecting bar. Two cylindrical electrodes are brought into contact with the curved portion of the spring contacts. Two sets of these are electrically connected to the same potential by a copper spacer. All spring contacts of the same set are connected to the same electrode. In an assembly of twenty-four spring contacts, for example, there are twelve parallel circuits each comprising two spring contacts connected in series. Current passing through the spring contacts raises their temperature, thus melting the solder layer deposited onto the card. Upon completion of the soldering operation, the spring contact connecting bar is removed.

Two electrodes 1 are respectively brought into contact with upper and lower copper connecting plates 2 and 3, the widths of which are equal to that of the card. Each plate 2 and 3 comprises a transversal bar 7 which bears against a complete row of spring contacts 8. They are insulated from one another by pad 4 made of nonconducting material. Copper spacer 5 electrically...