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Self-Adjusting Soldering Fixture

IP.com Disclosure Number: IPCOM000044067D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Margets, JG: AUTHOR [+2]

Abstract

A special fixture is needed to satisfy a printed circuit board requiring two distinct soldering processes. During the first process, the tri-lead pin, ground rail and power pins are soldered in the normal fashion. The second process uses a solder pump with a specially designed chimney built to accommodate a 21 x 42 matrix of pins (harcons) on a staggered 1.25 mm grid. A bowing occurs, however, at the harcon solder site because of the localized heat transmitted to the board site and because of the thin board cross-section. A self-adjusting soldering fixture is designed to accommodate board bowing during the solder process to attain a constant pin-to-board distance. The harcons 11 are attached to a selvage strip 12.

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Self-Adjusting Soldering Fixture

A special fixture is needed to satisfy a printed circuit board requiring two distinct soldering processes. During the first process, the tri-lead pin, ground rail and power pins are soldered in the normal fashion. The second process uses a solder pump with a specially designed chimney built to accommodate a 21 x 42 matrix of pins (harcons) on a staggered 1.25 mm grid. A bowing occurs, however, at the harcon solder site because of the localized heat transmitted to the board site and because of the thin board cross-section. A self-adjusting soldering fixture is designed to accommodate board bowing during the solder process to attain a constant pin-to-board distance. The harcons 11 are attached to a selvage strip 12. The pressure applied between the top of the selvage strip 12 and the harcon step 13, which comes in contact with the board surface, is applied by a spring-loaded fixture. The distance between the board surface and the top of the harcon 11 must be within .005" for the 88 harcons 11. To insure this relationship, four spring assemblies 21 are attached to a rigid bar 22 and variable pressure is transmitted through the ball 23 to the top of the floating fixture 24, to the harcon selvage strip 12, to the harcon 11 and finally to the board.

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