US 12,338,855 B2
Composite end connections
James William Bernard, Brackley (GB); Jon Pethick, Leicestershire (GB); and Robert Edwin Finney, Charlbury (GB)
Assigned to CROMPTON TECHNOLOGY GROUP, LTD., Solihull (GB)
Filed by Crompton Technology Group Limited, Solihull (GB)
Filed on Jan. 8, 2024, as Appl. No. 18/406,914.
Application 18/406,914 is a continuation of application No. 17/161,943, filed on Jan. 29, 2021, granted, now 11,905,991.
Claims priority of application No. 20275019 (EP), filed on Jan. 29, 2020.
Prior Publication US 2024/0151262 A1, May 9, 2024
This patent is subject to a terminal disclaimer.
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 at least one flank with a flank angle of between 32° and 41°, the flank angle being measured between the flank and a perpendicular to the central axis in a plane that contains the central axis.