Patent ID: 8002048
Filing Date: 2011-08-23
Classification: E21B

Abstract:
1. Drilling implement for driving a drill rod, the drilling implement having a mast, a drill drive guided on said mast for driving the drill rod, and a reversible gearing placed between the drill drive and the drill rod for transmission purposes, wherein the gearing has an input end and an output end, a drive unit with a first connecting device at the input end, and a driven unit with a second connecting device at the output end, the first connecting device and the second connecting device having a substantially identical construction, the first connecting device disengageably connecting the drive unit to the drill drive in a starting state of the gearing and disengageably connecting the drive unit to the drill rod in a reversed state of the gearing, and the second connecting device disengageably connecting the driven unit to the drill rod in the starting state of the gearing and disengageably connecting the driven unit to the drill drive in the reversed state of the gearing, whereby the gearing is placeable in disengageable, reversible manner on the drill drive, for inverting the gear ratio.