Extended grip range fastener and driver.

摘要

The fastener comprises a bolt (11) having a head (14) and a threaded shank (15) receivable in an internally threaded barrel (21) projecting from one face (22) of the head (23) of a nut (12). The nut (12) has a driving recess (25) in its other, outer, face (24). The threaded passage (26) through said barrel (21) is in open communication with the driving recess (25) in said nut (12) whereby the bolt shank (15) can enter the driving recess (25) when the nut (12) is tightened on the bolt (11). The length of the bolt shank (15) is substantially equal to the combined length of the nut barrel (21) and the nut head (23) whereby the bolt shank (15) cannot project beyond the outer face (24) of the nut head (23) when the nut (12) is tightened on the bolt (11). A driving tool (13) is provided with an exterior surface (28) complementary to the inner surface of the driving recess (25) in the nut head (23). The driving tool (13) also has a recess (31) in the end thereof for loosely receiving the bolt shank (15) when and if it enters the driving recess (25). <IMAGE>