Patent ID: 9234424
Filing Date: 2016-01-12
CPC Classification: E21C

Claim Text:
1. A bit assembly, comprising: a bit including a bit head, a bit shank, and a longitudinal axis, the bit head including a lower region having a contact surface extending perpendicular to the longitudinal axis, the bit including a throat transitioning from the contact surface to the bit shank; a mounting sleeve received about the bit shank; and a support element rotatable relative to the mounting sleeve, the support element including: wherein: the support element includes a protruding centering projection on the underside of the support element; the underside of the support element includes a circumferential lateral surface extending perpendicularly with respect to the longitudinal axis; and the centering projection includes an inclined centering surface, and a set-back recess recessed into the circumferential lateral surface and transitioning the inclined centering surface into the circumferential lateral surface.