Patent ID: 9359847
Filing Date: 2016-06-07
CPC Classification: E21B

Claim Text:
1. A core barrel head assembly configured to be tripped through a drill string having an outer core barrel defining a landing ring, comprising: an inner member; an outer sleeve moveably coupled to the inner member; and a non-dragging latching mechanism configured to be tripped into a drill string without dragging against an interior surface of the drill string, wherein the latching mechanism is configured to selectively move between an engaged position and a retracted position as the outer sleeve moves axially relative to the inner member wherein when in the engaged position, at least a portion of the latching mechanism extends outward of the outer sleeve, and wherein the non-dragging latching mechanism comprises a detent mechanism that is positioned within the inner member and moveable to a retracted detent position to selectively lock the latching mechanism in the retracted position, wherein in the retracted detent position, the detent mechanism extends outwardly of the inner member to mechanically engage the outer sleeve and prevent axial movement of the outer sleeve relative to the inner member during tripping of the core barrel head assembly.