Fastening element

Details Fastening element Fastening element

2008-09-26

2010-12-14

Estremsky, Gary (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

Reexamination Certificate

active

07850409

ABSTRACT:
A fastening element has a shaft (12), and a tapping thread (21) carried by the shaft (12) and having at least one screw thread (22, 42) a section (23; 43) of which that adjoins the thread pilot (35), having a plurality of following one another thread steps (24, 25, 26, 27; 44, 45, 46, 47) having different cross-sections, with a cross-section of the at least one screw thread (22; 42) decreasing stepwise toward the thread pilot (35) from a thread step (24, 25, 26, 27; 44, 45, 46, 47) to a thread step (24, 25, 26, 27; 44, 45, 46, 47), with the thread steps (24, 25, 26, 27; 44, 45, 46, 47) having respective cutting edge-forming end surfaces (28, 29, 30, 31; 48, 49, 50, 51) aligned, at least partially, in a direction of the thread pilot (35).

REFERENCES:
patent: 2200227 (1940-05-01), Olson
patent: 4046051 (1977-09-01), Lovisek
patent: 6056491 (2000-05-01), Hsu
patent: 7246979 (2007-07-01), Fujii et al.
patent: 91 03 773 (1992-09-01), None
patent: 198 01 105 (1999-07-01), None
patent: 101 13 946 (2002-09-01), None
patent: 1 557 576 (2005-07-01), None

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