Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Reexamination Certificate
2007-10-31
2010-10-26
Saether, Flemming (Department: 3677)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
C411S386000
Reexamination Certificate
active
07819613
ABSTRACT:
A self-tapping insert is installed in a pre-existing bore hole in a workpiece by rotating the insert, causing cutting threads on the exterior of the self-tapping insert to cut new threads. Engagement threads on the exterior of the self-tapping insert engage the new threads to retain the self-tapping insert within the workpiece. The self-tapping insert may comprise internal threads which are used to replaced damaged threads in the workpiece. The exterior threads of the self-tapping insert may be configured as left-handed threads, while the internal threads are right-handed threads. The top of the self-tapping insert may comprise a plurality of castellations, and a drive head having matching castellations may be employed to install the self-tapping insert, eliminating the need for installing the insert with a drive bolt. The exterior of the self-tapping insert may further comprise a leading edge for cutting the new threads, where the leading edge has greater radial extension than the trailing edge. This feature provides greater chip relief, thereby reducing the torque required to install the self-tapping insert.
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Duncan, Esq. James M.
Klein, DeNatale, Goldner et al.
Saether Flemming
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