Electric heating – Metal heating – By arc
Reexamination Certificate
2005-10-31
2010-10-05
Elve, M. Alexandra (Department: 3742)
Electric heating
Metal heating
By arc
C219S121670, C219S121850
Reexamination Certificate
active
07807945
ABSTRACT:
An improved method of cutting a helical gear sector onto a pivoting arm of a casement window is disclosed. The method includes beginning with a pre-hardened flat sheet of steel stock and cutting the arm and the helical gear sector of the arm in two steps. The non-toothed portions of the arm are cut with a laser and nitrogen assist or shielding gas to prevent any oxidation to the non-toothed portions of the structure. The helical gear sector is also cut with a laser, but using oxygen assist gas. Use of the oxygen prevents recasts slag from accumulating in the gear sector. Thus, a finished part is completed with two laser cutting operations thereby eliminating the need for separate stamping, shaping, deburring and subsequent heat treatment processes used in conventional manufacturing methods. The subsequent heat treating is eliminated because a pre-hardened steel stock may be utilized.
REFERENCES:
patent: 1670475 (1928-05-01), Nicholson
patent: 2949042 (1960-08-01), Bennett
patent: 3039764 (1962-06-01), Heinsman et al.
patent: 3767389 (1973-10-01), Floreen
patent: 4010345 (1977-03-01), Banas et al.
patent: 4288680 (1981-09-01), Roder
patent: 5344502 (1994-09-01), Mack et al.
patent: 5380976 (1995-01-01), Couch et al.
patent: 5444211 (1995-08-01), Nakata et al.
patent: 5746842 (1998-05-01), Eguchi et al.
patent: 5760368 (1998-06-01), Nakata
patent: 5802913 (1998-09-01), Winner
patent: 5855397 (1999-01-01), Black et al.
patent: 5951427 (1999-09-01), Schroeder
patent: 6330836 (2001-12-01), Watanabe et al.
patent: 6672010 (2004-01-01), Gledhill et al.
patent: 2002/0124707 (2002-09-01), Izard
patent: 2002/0179188 (2002-12-01), Yamaguchi et al.
patent: 2004/0064947 (2004-04-01), Yanagimoto et al.
patent: 2006/0065345 (2006-03-01), James et al.
Bourgoin Brian David
Briggs Jeffrey Mark
Ostby Erik Jan
Tooker Craig Charles
Elve M. Alexandra
Miller Matthias & Hull
Roto Frank of America, Inc.
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