US 11,933,339 B2
Universal torque indicator fitting with positive lock feature
Nagarajan Ramaswamy, Fort Worth, TX (US)
Assigned to Parker-Hannifin Corporation, Cleveland, OH (US)
Filed by Parker-Hannifin Corporation, Cleveland, OH (US)
Filed on Aug. 1, 2022, as Appl. No. 17/878,117.
Claims priority of provisional application 63/234,722, filed on Aug. 19, 2021.
Prior Publication US 2023/0056893 A1, Feb. 23, 2023
Int. Cl. F16B 31/02 (2006.01)
CPC F16B 31/024 (2013.01) [F16L 2201/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fitting assembly comprising:
a nut having a first end and a second end opposite from the first end;
a visual indicator assembly positioned on the first end of the nut, the visual indicator assembly comprising a plurality of visual indicators that provide a visual indication of a torque level being applied to the nut;
a sleeve attached to the nut and including a window through which a portion of the plurality of visual indicators is visible based on the torque level being applied to the nut; and
a resilient member that couples the sleeve to the nut;
wherein as the nut is rotated to apply torque to the nut, the resilient member biases the sleeve in a fixed position and the nut rotates relative to the sleeve, whereby the visual indicator assembly rotates relative to the sleeve to alter which portion of the visual indicator assembly is visible through the window to provide a visual indication of when the torque level being applied to the nut is a desired operational torque level.