US 3,989,331 AGranted

Dual-in-line socket

AssigneeAugat Inc.

InventorRichard J. Hanlon

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Abstract

A socket for a dual-in-line electronic package. The socket is plugged into a printed circuit board having dual-in-line arrays of holes therethrough, and an electronic package is removably plugged into the socket. Several alternative means are disclosed to prevent undesired wicking of the solder into the socket contact cavities above the holes in the printed circuit board when the socket is wave soldered to the board.

Claims10

Dependent claims

A socket for removably receiving a dual-in-line electronic package and for mounting to a dual-in-line array of holes in a printed circuit board, said electronic package including a generally flat rectangular housing with two substantially parallel rows of conductive leads respectively extending outwardly from a pair of opposite parallel edges of said housing and turned at substantially right angles to the flat surface of said housing to protrude beyond one flat surface thereof, said leads tapering symmetrically to a reduced width at their respective ends, said socket comprising:

a unitary generally flat rectangular insulator having raised parallel sides along two opposite edges at the top, a central portion with flat bearing surfaces between said parallel sides said parallel sides extending above said bearing surfaces, a plurality of cavities opening into the bottom surface of said insulator, each said cavity having substantially the same cross section from its bottom opening to a point adjacent and spaced from said bearing surfaces, said cavities being arranged in parallel rows adjacent said parallel sides, each of said cavities having a downward facing shoulder along one internal side thereof spaced from said bottom opening, and a plurality of slots through said central portion adjacent said parallel sides and said bearing surfaces, each slot opening into one of said cavities;
and
a plurality of contacts, one of said contacts being mounted in each cavity, each of said contacts being formed with a body portion having an upward facing step adapted to abut said shoulder within said cavity thereby forming a positive stop when said contact is mounted within said cavity, said body portion being in an interference fit within the bottom of said cavity, a pair of resilient figures extending upwardly from said body portion into said cavity and positioned beneath said slot, and an elongated lead extending downwardly from said body portion, said fingers of said contact bending outwardly immediately above said body to form oppositely facing knees, and then bending inwardly to a point of normally spaced confronting relationship when outside of said cavity, then bending outwardly at the upper ends to form a tapered opening therebetween wider than the width of said slots, the distance between said knees of said contact being normally greater than the width of said cavity, said knees being forced toward each other by the opposite walls of said cavity engaging said knees when said contact is mounted therein, thereby forcing said fingers toward each other and in a preloaded resiliently contacting relationship at said normally spaced points, the length of said cavity from said shoulder to said point adjacent said bearing surfaces being greater than the length of said fingers above said upward facing step.

Dependencies are inferred from the claim text.

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Abstract

a unitary generally flat rectangular insulator having raised parallel sides along two opposite edges at the top, a central portion with flat bearing surfaces between said parallel sides said parallel sides extending above said bearing surfaces, a plurality of cavities opening into the bottom surface of said insulator, each said cavity having substantially the same cross section from its bottom opening to a point adjacent and spaced from said bearing surfaces, said cavities being arranged in parallel rows adjacent said parallel sides, each of said cavities having a downward facing shoulder along one internal side thereof spaced from said bottom opening, and a plurality of slots through said central portion adjacent said parallel sides and said bearing surfaces, each slot opening into one of said cavities;
and
a plurality of contacts, one of said contacts being mounted in each cavity, each of said contacts being formed with a body portion having an upward facing step adapted to abut said shoulder within said cavity thereby forming a positive stop when said contact is mounted within said cavity, said body portion being in an interference fit within the bottom of said cavity, a pair of resilient figures extending upwardly from said body portion into said cavity and positioned beneath said slot, and an elongated lead extending downwardly from said body portion, said fingers of said contact bending outwardly immediately above said body to form oppositely facing knees, and then bending inwardly to a point of normally spaced confronting relationship when outside of said cavity, then bending outwardly at the upper ends to form a tapered opening therebetween wider than the width of said slots, the distance between said knees of said contact being normally greater than the width of said cavity, said knees being forced toward each other by the opposite walls of said cavity engaging said knees when said contact is mounted therein, thereby forcing said fingers toward each other and in a preloaded resiliently contacting relationship at said normally spaced points, the length of said cavity from said shoulder to said point adjacent said bearing surfaces being greater than the length of said fingers above said upward facing step.