Patent Number: 6,305,649

Title: Retaining device

Abstract: A retaining device to prevent linear movement of an elongate member (10) in the downwards direction comprising a plurality of segmental ball slips (14) surrounding the member (10) and removably introduced into a tapered opening in a supported bushing (13), each ball slip (14) including a ball cage (18) having balls (20) and ramps (21) and a spring (19) urging the ball cage downwardly and thus the balls inwardly to grip the elongate member with a smooth rolling action preventing surface damage to the elongate member. The ball slips (14) may be hinged together around the elongate member (10) and may removed manually or by power operated means at (22).

Inventors: Walmsley; Owen (Roy Bridge, Invernesshire, PH31 4AS, GB), Emmett; Robert (Lancaster, LA1 4HZ, GB)

Assignee: Walmsley; Owen

International Classification: E21B 19/10 (20060101); E21B 19/00 (20060101); F16L 003/00 ()

Expiration Date: 10/23/2018