A pin grip array zero insertion force connector has 10,000 or more normally closed contacts provided in rows on a motherboard. Alternating rows of contacts respectively include first and second type contacts, and drawbars are provided between the rows of contacts. Alternate drawbars are caused to slide...http://www.google.com/patents/US4889499?utm_source=gb-gplus-sharePatent US4889499 - Zero insertion force connector
