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US 5,690,184 AGranted
Rock drilling apparatus
AssigneeFujita Corporation
InventorToshiro Tsuchiya
Life of this patent
Estimating the term…
Abstract
A rock drilling apparatus includes a frame having a front end, a guide rod supported on the front end of the frame, a rotary rod extending parallel to the guide rod and supported on the frame for rotation about its own axis and longitudinal movement beyond the front end of the frame, and a drill bit mounted on a front tip end of the rotary rod. The guide rod comprises a shank fixed to the front end of the frame and a tubular member extending substantially fully over the shank and rotatably disposed around the shank.
Claims19
A rock drilling apparatus comprising:
- a frame having a front end;
- a guide rod supported on said front end of the frame;
- a rotary rod extending parallel to said guide rod and supported on said frame for rotation about its own axis and longitudinal movement beyond said front end of the frame;
- and
- a drill bit mounted on a front tip end of said rotary rod;
- said guide rod comprising a shank fixed to said front end of the frame and a tubular member extending substantially fully over said shank and rotatably disposed around said shank.
3 more elements
A rock drilling apparatus comprising:
- a frame having a front end;
- a guide rod fixed to said front end of the frame;
- a rotary rod extending parallel to said guide rod and supported on said frame for rotation about its own axis and longitudinal movement beyond said front end of the frame;
- a drill bit mounted on a front tip of said rotary rod;
- and
- at least a portion of said guide rod being rotatable about a longitudinal axis of said guide rod.
3 more elements
Dependencies are inferred from the claim text.