Dentistry – Apparatus – Tool bit
Patent
1991-08-07
1992-03-31
Wilson, John J.
Dentistry
Apparatus
Tool bit
433166, A61C 302
Patent
active
051003228
ABSTRACT:
A water-cooled friction-type cutting dental tool is disclosed comprising an at least partially hollow cylindrical body portion having an external circumferential cutting surface, an interior circumferential surface defining a hollow space, and an external annular transverse end cutting surface at one end. The end cutting surface surrounds a central opening to the hollow space; in the hollow space, a centered elongated member is secured so as to be substantially concentric to and held partially within the hollow space and partially extending beyond the hollow space, beyond the end cutting surface. The portion of the elongated member extending beyond the end cutting surface has a smooth rounded surface for limiting the cutting depth of the tool, both longitudinally and transversely. The portion within the hollow space has a cross-sectional dimension such that an annular channel is defined between the elongated member and the interior circumferential surface.
REFERENCES:
patent: 1123730 (1915-01-01), Greenfield
patent: 1333388 (1920-03-01), Chester
patent: 2250058 (1941-07-01), Brooks
patent: 2366767 (1945-01-01), Brooks
patent: 2562587 (1951-07-01), Swearingen
patent: 2707329 (1955-05-01), Costoff
patent: 2855673 (1958-10-01), Gruenwald
patent: 3461563 (1969-08-01), Nelson
patent: 3979829 (1976-09-01), Lemos
Magidoff Barry G.
Wilson John J.
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