Thread-tapping screw

Details Thread-tapping screw Thread-tapping screw

2008-10-30

2010-06-22

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

C411S387500

Reexamination Certificate

active

07740435

ABSTRACT:
A thread-tapping screw (11) has a thread (21) extending, starting from the screw shaft free end (15), at least along a portion of the shaft length and a height of which constantly decreasing toward the free end (15) of the shaft (12), and a plurality of cutting bodies (26, 36, 46, 56, 66) formed of a material having a greater hardness than hardness of the thread (21), located in recesses (24) formed in the thread (21) and opening radially outwardly and having, respectively, a radial outer profile (27, 37, 47, 57, 67) projecting, at least partially, beyond the thread and a height (A, B, C, D, E) of which decreases toward the free end (15) of the shaft (12) stepwise.

REFERENCES:
patent: 3426642 (1969-02-01), Phipard, Jr.
patent: 3831415 (1974-08-01), Skierski
patent: 3982464 (1976-09-01), Sygnator
patent: 4259889 (1981-04-01), Capuano
patent: 5385439 (1995-01-01), Hurdle
patent: 6478520 (2002-11-01), Sala
patent: 7338243 (2008-03-01), Gerhard
patent: 2006/0120826 (2006-06-01), Wieser et al.
patent: 2006/0193713 (2006-08-01), Gerhard

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