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US 6,267,595 B1Granted
Rotary tool for machining workpieces
AssigneeEdenta AG Dentalproducte
InventorDieter Grätz
Life of this patent
Estimating the term…
Abstract
A rotary tool for material detaching work, especially in dentistry, comprising a machining portion having an outer circumferential surface coated with a nickel layer in which diamond particles are embedded, is characterized in that the nickel layer and the diamond particles protruding from it are covered by a layer of chromium nitride. The duration of the tool is considerably increased by the chromium nitride layer.
Claims3
A rotary machining tool for use in the field of dentistry, comprising:
- (a) a clamping shaft portion (3);
- (b) a cylindrical machining head portion (1) arranged collinearly relative to said shaft portion, said head portion having a first end adjacent said clamping shaft portion, and a rounded second end remote from said clamping shaft portion;
- (c) a neck portion (2) connecting said head portion first end with said shaft portion;
- (d) a layer of nickel (4) covering at least the cylindrical circumferential surface of said head portion;
- (e) a plurality of diamond particles (5) embedded in said nickel layer, said particles being in contiguous engagement with said head portion cylindrical surface and protruding outwardly from said nickel layer;
- and
- (f) a layer of chromium nitride (6) completely covering the protruding portion of said diamond particles and the external surface of said nickel layer, said chromium nitride layer having a thickness of from 1 to 4 μm, whereby said chromium nitride layer fills the uneven surface structure of the diamond particles as well as any gaps separating said nickel layer and said diamond particles.
4 more elements
Dependencies are inferred from the claim text.