Tools – Wrench – screwdriver – or driver therefor – Spanner
Reexamination Certificate
2005-03-01
2005-03-01
Saether, Flemming (Department: 3677)
Tools
Wrench, screwdriver, or driver therefor
Spanner
C081S064000, C081S003440, C411S910000
Reexamination Certificate
active
06860177
ABSTRACT:
This invention concerns a screw for the anti-fraud locking of a throttle or clamp lever on the control rod of a valve shutter or stopcock, comprising a threaded shank having a polygonal head surmounted by a truncated-cone shaped dome, semi-spherical or of other shape, the base of which extends over the edge of the perimeter surface of said polygonal head, where said dome is free to turn around the shank above said polygonal head, so that only by means of a special tool can the threaded screw shank be tightened or loosened by means of the nut, while by operating on the dome with any tool or utensil, no effect is achieved as this is able to turn idly around the threaded shank.
REFERENCES:
patent: 66585 (1867-07-01), Harvey
patent: 3034386 (1962-05-01), Corlett et al.
patent: 3060785 (1962-10-01), Corlett
patent: 3604487 (1971-09-01), Gilbert
patent: 4081979 (1978-04-01), Dawson
patent: 4324516 (1982-04-01), Sain
patent: 4504180 (1985-03-01), Ishii
patent: 4521146 (1985-06-01), Wharton
patent: 5071300 (1991-12-01), McCauley
patent: 5280941 (1994-01-01), Guhlin
patent: 5417529 (1995-05-01), Volkmann
patent: 6276662 (2001-08-01), Bugatti
patent: 6305890 (2001-10-01), Okamura
McGlew and Tuttle , P.C.
Saether Flemming
Valvosanitaria Bugatti S.p.A.
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