US 10,890,033 B1
Kelly bar with locking feature, related system and method
Mark Allan Crosby, Saginaw, TX (US); and Douglas Allan Watson, Aledo, TX (US)
Assigned to Watson, Incorporated, Fort Worth, TX (US)
Filed by Watson, Incorporated, Fort Worth, TX (US)
Filed on Dec. 10, 2018, as Appl. No. 16/215,500.
Claims priority of provisional application 62/596,881, filed on Dec. 10, 2017.
Int. Cl. E21B 17/00 (2006.01)
CPC E21B 17/00 (2013.01) 19 Claims
OG exemplary drawing
 
1. A Kelly bar apparatus comprising:
an outer tube that forms an inner surface and a plurality of keys arranged into one or more key groups, wherein each key group is characterized at least such that:
the keys are arranged into a plurality of key sets, each key set comprising at least two keys circumferentially adjacent but spaced apart from one another, and each key extending longitudinally along a portion of the outer tube and radially inwardly from an inner surface of the outer tube, and
the key sets are arranged into two or more key sub-groups disposed at different longitudinal positions respectively along the length of the outer tube, each key sub-group being comprised of at least two key sets, the key sets within a given one of the key sub-groups being disposed at the same longitudinal position along the outer tube and being circumferentially spaced apart from one another; and
a first inner tube sized and configured to at least partially nest and rotate within and telescopically slide relative to the outer tube, the first inner tube forming an outer surface, wherein the first inner tube further comprises a plurality of flute-like splines circumferentially spaced apart and extended along a longitudinal axis of a portion of the first inner tube and extending radially outwardly from the outer surface of the first inner tube, so as to define at least two fillet-like gaps between respective pairs of the splines; and
wherein each key set of the outer tube is sized and configured to slidably engage with a respective one of the gaps between the splines of the first inner tube when the first inner tube is nested within the outer tube and the outer tube is rotationally disposed in an unlocked position permitting telescopic extension of the first inner tube relative to the outer tube, and wherein each key set of the outer tube is sized and configured to fit within a respective notch formed within a respective one of the splines of the first inner tube when the first inner tube is nested within the outer tube and the outer tube is rotationally disposed in a locked position inhibiting telescopic extension of the first inner tube relative to the outer tube.