Rock drill
AssigneeRobert Bosch GmbH
InventorsKarl Wanner, Wilbert Reibetanz
Life of this patent
Estimating the term…
Abstract
A rock drill comprises a shaft having a leading and a trailing end, a shank connected to the trailing end, and a drill head connected to the leading end of the shaft. Means for transporting drilling from the leading end toward the trailing end of the shaft are provided which include at least one channel extending parallel to the shaft from the drill head toward the shank. A shell coaxially surrounds the shaft and bounds the channel, which shell has an open front end adjacent the drill head, a closed rear end facing the shank and at least one transverse bore adjacent the rear end of the shaft and open at the outer surface of the shell.
Claims31
A rock drill comprising a shaft having a leading end and a trailing end;
- a shank connected to said trailing end of said shaft;
- a drill head, having a centering drill bit, connected to said leading end of said shaft;
- means for transporting drillings from said leading end towards said trailing end of said shaft, said means including at least one channel extending substantially parallel to said shaft from said drill head toward said shank;
- and a shell coaxially surrounding said shaft and bounding said channel, said shell having an open front end adjacent said drill head, a closed rear end facing said shank and at least one substantially transverse bore adjacent said rear end and open at the outer surface of said shell, said shell having at least two portions, including a front portion adjacent said front end of said shell and constituted of a wear-resistant material, and a rear portion adjacent said rear end of said shell, said front portion of said shell having a first section extending towards said rear portion of said shell and having a reduced thickness, said rear portion of said shell having a second section extending towards said front portion of said shell and having a reduced thickness, one of said sections overlapping the other section.
A rock drill comprising a shaft having a leading end and a trailing end;
- a shank connected to said trailing end of said shaft;
- a drill head, having a centering bit, connected to said leading end of said shaft, said shank, said shaft and said drill head being constituted by separate members, said shaft being constituted by at least two separate parts respectively adjacent said drill head and said shank;
- fastening means connecting said separate members to each other and, adapted to transmit torque and axial impact between said separate members;
- means for transporting drillings from said leading end towards said trailing end of said shaft, said means including at least one channel extending substantially parallel to said shaft from said drill head toward said shank;
- and a shell coaxially surrounding said shaft and bounding said channel, said shell having an open front end adjacent said drill head, a closed rear end facing said shank and at least one substantially transverse bore adjacent said rear end and open at the outer surface of said shell;
- further fastening means connecting said separate parts of said shaft to each other and adapted for transmitting torque and axial impact between said parts, said further fastening means being provided with a nut-shaped connecting member adapted to receive therein proximal ends of said parts of said shaft to be connected and having a circular cylindrical surface and a longitudinal axis, said connecting member being adapted to be engaged with and to support the inner surface of said shell.
Dependencies are inferred from the claim text.