Electrical connector keying means

An electrical connector assembly having improved keying means, said connector assembly comprising a plug part and a receptacle part, each of said parts comprising a housing having at least one electrical contact terminal therein, said housings each having a mating face, said mating faces being opposed to each other when said parts are coupled, said receptacle part having a hood which surrounds, and extends forwardly from, said mating face of said receptacle part, said hood having a leading edge which is spaced from said mating face of said receptacle part, said plug part having forward portions which are received in said hood when said parts are coupled, said connector assembly being characterized in that:

• said hood has at least two latent slots therein extending axially from said leading edge towards said mating face of said receptacle part, each of said latent slots comprising thin-walled portions of said hood which have a wall thickness which permits easy removal thereof with resulting formation of an actual slot,
• at least two key-receiving groove means on said forward portions of said plug part, said groove means being in alignment with said latent slots when said parts are coupled, said groove means extending from said mating face of said plug part across said forward portions of said plug part,
• said groove means and an actual slot formed from one of said latent slots having cross sections which are substantially identical,
• at least one key which has a uniform cross section along its length, said key having a first axially extending portion which is dimensioned to be permanently placed in either one of said groove means or in an actual slot formed from one of said latent slots, said key having a second axially extending portion which is dimensioned to be freely received in an actual slot when said key is placed in one of said groove means whereby,
• said plug part and said receptacle part can be keyed to each other by forming an actual slot in said receptacle part and placing a key in the corresponding groove means in said plug part, and the keying can be later changed by placing a key in the actual slot in the receptacle part.