US 11,905,991 B2
Composite end connections
James William Bernard, Brackley (GB); Jon Pethick, Leicestershire (GB); and Robert Edwin Finney, Charlbury (GB)
Assigned to CROMPTON TECHNOLOGY GROUP LIMITED, Solihull (GB)
Filed by Crompton Technology Group Limited, Solihull (GB)
Filed on Jan. 29, 2021, as Appl. No. 17/161,943.
Claims priority of application No. 20275019 (EP), filed on Jan. 29, 2020.
Prior Publication US 2021/0231164 A1, Jul. 29, 2021
Int. Cl. F16C 3/02 (2006.01)
CPC F16C 3/026 (2013.01) 19 Claims
OG exemplary drawing
 
1. A fibre-reinforced polymer composite shaft for transmitting loads along a central axis, the composite shaft comprising:
a first interface surface extending along the central axis and comprising at least one helical groove and/or a plurality of circumferential grooves for engaging with at least one corresponding helical ridge and/or a plurality of corresponding circumferential ridges of a second interface surface of an end fitting;
wherein the at least one helical groove and/or the plurality of circumferential grooves comprises two opposing flanks each having a flank angle of between 32° and 51°, wherein the flank angle is measured between the flank and a perpendicular to the central axis in a plane that contains the central axis.