Plug-in insertion system for electrical communications apparatus

Claim 1

A plug-in insert system for electrical communication apparatus, comprising: an insert having an electrical apparatus associated therewith and an insert receiving unit having guide rails engageable with a guide means of the insert, the insert receiving unit being dimensioned to receive the insert; first and second electrical contacting element means on the insert and receiving unit respectively for electrical contact engagement therebetween upon insertion of the insert in the insert receiving unit; means for unmistakable allocation of a proper insert with a corresponding insert receiving unit, said means including identification pins and matching corresponding bores allocated to the insert and receiving unit, the pins having a sufficient length such that if a corresponding bore is blocked off, electrical contact will not occur between the first and second electrical contacting element means, and if a corresponding bore is not blocked off, the identification pins will engage in the matching bores upon complete insertion and the first and second contacting element means will establish contact; the matching corresponding bores being formed in respective coding strips mountable on the insert and also in a facing surface of the insert receiving unit at a frontal region of each, and eacn coding strip mounted on the insert having means for alignment and attachment thereof at the frontal region of the insert; all of the bores in the coding strips and in the facing surface having a same diameter; the identification pins having a rear-side portion which is slit so as to permit a press fit of the pin when it is received in a respective bore for mounting, each pin also having a front portion which is tapered and a collar between the front portion and read-side portion, said collar serving as a stop upon insertion of the rear-side portion into the respective bore; recess means provided in the insert for receiving said coding strips; a central assembly screw means for securing the insert and insert receiving unit together; and at least one of said coding strips being provided on each side of the central assembly screw means on the insert.