Drill bit
AssigneeHilti Aktiengesellschaft
InventorsDiep Chau-Ngoc, Rolf Spangenberg
Life of this patent
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Abstract
A drill bit for producing circular-cylindrical recesses or boreholes is formed of a drilling cylinder (1) having cutting elements (3) at the leading end in the drilling direction. A detachable core sleeve (2) is arranged in the interior of the drilling cylinder (1). The cutting elements (3) extend radially inwardly at least for the wall thickness (a) of the core sleeve (2). The core sleeve (2) serves to receive a core formed of removed masonry and is intended to facilitate removal of the core from the drill bit. The manageability of the drill bit is substantially improved in this way.
Claims10
Drill bit for cutting circular-cylindrical recesses or boreholes comprising an axially extending drilling cylinder (1) having a first end leading in the drilling direction, a second end trailing in the drilling direction, an axially extending inner surface and an axially extending outer surface, at least one cutting element (3) located at said first end of said drilling cylinder and projecting at least radially inwardly from said inner surface, said drilling cylinder being open at said first and second ends thereof, said inner surface having a constant inside diameter between said first and second ends of said drilling cylinder, an axially extending detachable core sleeve (2) located within said drilling cylinder having a first end leading in the drilling direction and having a wall thickness transversely of an axial direction corresponding at most to the radially inward projection of said cutting element (3).
Dependencies are inferred from the claim text.