Thread-cutting screw

Details Thread-cutting screw Thread-cutting screw

2008-03-04

2008-03-04

Mitchell, Katherine (Department: 3677)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

C411S901000, C411S902000, C411S311000, C411S411000, C411S304000, C411S387800, C408S230000

Reexamination Certificate

active

10545422

ABSTRACT:
A thread-cutting screw (1) serves for being screwed into the bore-hole wall (1a) of a bore-hole (1b). It comprises a substantially cylindrical core (2) of metal which has a central longitudinal axis (4), a thread (5) forming one piece with the core (2), and at least one cutting element (6, 7), disposed within the thread (5), for cutting engagement with the bore-hole wall. The core (2) consists of a metal of a carbon content between 0 and 0.5 percent by weight. The at least one cutting element (6, 7) is fixedly connected with the core (2), constituting a welded structure of a metal with a carbon content greater than 0.8 percent by weight. Being safely connected to the core (2), the cutting elements (6, 7) offer efficient cutting operation, with any risk of brittle fracture of the screw (1) being precluded.

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