hybrid drill that includes earth drilling and percussion elements to drill land formations

摘要

the present invention relates to a hybrid drill that includes an earth-drilling element and a percussion element. the earth piercing element and the percussion element are coaxially arranged, with the earth piercing element surrounding the percussion element. an alternating member of the percussion element can oscillate in a way that allows a bottom end of the alternating member to repeatedly project from a bottom end of the earth-piercing element and be repeatedly drawn back. a configuration of the earth drilling element can allow it to drill and remove some materials from a ground formation, while the percussion element can allow the hybrid drill to drill and remove difficult to drill materials, including abrasive materials with high compressive forces, such as flint.