Bolt-lock structure

A lock structure comprising an elongated bolt member, first and second externally threaded ends on said bolt member, first and second nuts of solid of revolution configuration, first and second internally threaded bores on said first and second nuts, respectively, for mating engagement with said first and second externally threaded ends, respectively, first and second outer faces on said first and second nuts, respectively, first and second key-receiving depressions of endless curved configuration in said first and second faces, respectively, for receiving mating key members for selectively tightening and loosening said nuts, a tapped bore in at least one of said outer faces, a key member having a flange for mating engagement with one of said depressions, a bore extending through said key member, and a screw extending through said bore for reception in said tapped bore for locking said key member to said nut.

A stud for mounting in a tapped opening comprising an elongated member, first and second externally threaded ends on said elongated member, a wrench-receiving bore extending axially of said elongated member in at least said first end of said elongated member, a surface hardened portion on said elongated member between said threaded ends and adjacent said second threaded end, a nut of solid of revolution configuration, a tapped bore in said nut for engagement with said first threaded end, an outer face on said nut, a key-receiving depression of endless curved configuration in said outer face, a second tapped bore in said outer face, said second tapped bore being of smaller size than said tapped bore, a key member having a flange for mating engagement with said key-receiving depression, a bore extending through said key member, and a screw extending through said bore for reception in said second tapped bore for locking said key member to said nut.

In a structure having a flange and member and a space between said flange and said member, with a bore in said flange and a tapped opening in said member in alignment with said bore comprising an elongated bolt member, first and second externally threaded ends on said elongated bolt member, a nut of solid of revolution configuration, an internally threaded bore on said nut for mating engagement with said first threaded end, said second threaded end being received in said tapped opening in said member, an outer face on said nut, a key-receiving depression of endless curved configuration in said outer face for receiving a mating key member for selectively tightening and loosening said nut to cause it to bear on said flange, a hardened central portion on said elongated bolt member intermediate said first and second externally threaded ends, said hardened central portion being located in said space between said flange and said member, relatively ductile ends on said bolt member outwardly of said central portion, and a relatively ductile core within said hardened central portion.

A nut and key combination comprising:

• a nut comprising a first body portion of solid revolution configuration having first and second opposite faces, a first internally threaded bore extending axially inwardly from said first face, key-receiving depression means having a predetermined curved periphery extending inwardly from said second face, a second internally threaded bore extending axially inwardly from said second face;
• and a key having a second body portion, a flange on said second body portion for mating engagement with said predetermined curved periphery of said depression means, and a screw mounted on said second body portion for reception in said second internally threaded bore for locking said key to said nut.