US Patent 7086313 Screwdriver connector

In one aspect, the present invention provides screwdriver connectors that each include (a) a body defining (1) a first end defining a first opening and a second opening; (2) a first cavity that opens onto the first end through the first opening; (3) a second cavity, connected to the first cavity by a passage, that opens onto the first end through the second opening; (b) a locking member disposed within the passage; (c) a spring and a tensioning member disposed within the second cavity; and (d) a collar that releasably engages the first end of the body, wherein in operation the spring biases the tensioning member against the collar and against the locking member which engages a bit disposed within the first cavity, thereby immobilizing the bit within the first cavity.