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US 10,189,090 B2Granted
Drilling tool
AssigneeKennametal Inc.
InventorMichael Schuffenhauer
Life of this patent
Estimating the term…
Abstract
A drilling tool with: a shaft; a seat at one end of the shaft; a drill bit, which is arranged on the seat; and a clamping section, which is provided on the shaft and can interact with the drill bit. Also provided is a tensioning screw, which is screwed into the shaft and comprises an expanding section as well as a contact section. The expanding section interacts with the clamping section, and the contact section interacts with the drill bit.
Claims18
A drilling tool comprising:
- a shaft having a longitudinal axis;
- a seat disposed toward an axial end of the shaft;
- a drill bit accommodated at the seat;
- a clamping section, which is disposed on the shaft and interacts with the drill bit;
- and
- a tensioning element which is disposed in the shaft and is axially displaceable with respect to the shaft, the tensioning element comprising an expanding section and a contact section, the expanding section being connected to the contact section;
- wherein the expanding section interacts with the clamping section, and the contact section interacts with the drill bit;
- the clamping section comprising a frustoconical inner surface;
- the frustoconical inner surface expanding toward an axial end of the shaft;
- the expanding section of the tensioning element comprising a frustoconical shape which is complementary to the inner surface of the clamping section.
7 more elements
A drilling tool comprising:
- a shaft having a longitudinal axis;
- a seat disposed toward an axial end of the shaft;
- a drill bit accommodated at the seat;
- a clamping section, which is disposed on the shaft and interacts with the drill bit;
- and
- a tensioning element, which is disposed in the shaft and comprises an expanding section and a contact section;
- wherein the expanding section interacts with the clamping section, and the contact section interacts with the drill bit;
- the clamping section comprises a frustoconical inner surface;
- wherein the frustoconical inner surface expands toward an axial end of the shaft;
- the expanding section of the tensioning element comprises a frustoconical shape which is complementary to the inner surface of the clamping section;
- the clamping section includes a cylindrical inner surface disposed axially adjacent to the frustoconical inner surface;
- and
- the tensioning element includes a cylindrical outer surface disposed axially adjacent to the frustoconical shape of the expanding section;
- wherein, upon axial displacement of the tensioning element with respect to the bore, the frustoconical shape of the expanding section clamping section is displaced past the frustoconical inner surface of the clamping section such that the cylindrical outer surface of the tensioning element abuts the cylindrical inner surface of the clamping section.
11 more elements
Dependencies are inferred from the claim text.