Titiable electric thermode for multiple connection reflow solder

Electric heating – Heating devices – Tool or instrument

Patent

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Details

219228, 219243, 219 8516, 228 51, 2281802, H05B 300, B23K 302

Patent

active

048718998

ABSTRACT:
An electrically heated thermode mounts to a support movable to position the thermode for multiple lead reflow soldering and includes a flat resistance element folded on its flat side in a U-shape structure in which the bight portion forms the pressing portion and the legs the terminal portions of the thermode. To overcome a problem arising where a group of joints to be soldered have varying height tops, the way in which the thermode is mounted to the movable support provides freedom of rotational movement of the thermode relative to the support while providing a low resistance electrical connection between support and the thermode terminal portions. To overcome a problem arising because opposite end joints sink more heat than interior joints, terminal plates are shaped and connected to the terminal portions so as to distribute a sheet of current in a way that more of the current flows along side edges than along the interior portion of the U-shaped structure.

REFERENCES:
patent: 1816115 (1931-07-01), Helle
patent: 3608809 (1971-09-01), Cushman
patent: 3948429 (1976-04-01), Davies et al.
patent: 3991297 (1976-11-01), Ammann
patent: 4412123 (1983-10-01), Ammann et al.

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