US Patent 10227842 Friction-lock frac plug

A downhole tool includes an upper wedge member and a lower wedge member. The upper and lower wedge members each have a circumferential width that decreases proceeding from an outer axial end thereof to an inner axial end thereof. As the downhole tool actuates from a first state to a second state, the upper and lower wedge members move axially with respect to a central longitudinal axis through the downhole tool, the upper and lower wedge members move radially-outward with respect to the central longitudinal axis, and the upper and lower wedge members remain coupled to one another as the upper and lower wedge members move.