A connector for a hand tool is provided. The connector includes a tool receiving portion configured to receive any one of a plurality of work tool pieces of the type having one of either at least a first or second locking configuration, wherein the first locking configuration is different at least in...http://www.google.es/patents/US20070108706?utm_source=gb-gplus-sharePatente US20070108706 - Tool connector having multiple locking positions
