TOP SURFACE DRILLING DEVICE AND METHODS FOR DRILLING A CORE IN A TOP SURFACE
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Abstract
A top surface drilling device has a core bit and a drill head disposed in the core bit. The drill head has a smaller diameter than that of the core bit, and the core bit and the drill head can be driven at different angular speeds.
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Citations
43 Claims
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1-26. -26. (canceled)
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27. A top surface drilling device, comprising:
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a core bit; and a drill head disposed in the core bit, the drill head having a smaller diameter than a diameter of the core bit; wherein the core bit and the drill head can be driven simultaneously at different angular speeds. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for drilling a core in a top surface for the creation of a cavity, comprising:
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drilling with a core bit at a first angular speed; and simultaneously with the drilling with the core bit, drilling with a drill head of smaller diameter than the core bit, at a second angular speed different from the first angular speed. - View Dependent Claims (38)
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39. A top surface drilling device, comprising:
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a core bit; a drill head disposed in and concentric with the core bit, the drill head having a smaller diameter than a diameter of the core bit; a planetary gearing comprising a sun gear, a ring gear and one or more planetary gears, the sun gear and the ring gear engaging with the one or more planetary gears, the sun gear operatively connected to the drill head, and the one or more planetary gears operatively connected to the core bit. - View Dependent Claims (40, 41, 42, 43)
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Specification