Retaining device
AssigneesOwen Walmsley, Robert Emmett
InventorsOwen Walmsley, Robert Emmett
Life of this patent
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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).
Claims8
A retaining device to prevent linear movement of an elongate member in one direction, comprising at least one retaining member adapted to engage an outer wall surface of the elongate member, said at least one retaining member having at least one gripping member movable with respect to the retaining member into engagement with the elongate member;
- characterised in that the gripping member includes balls/rollers which are so disposed as to engage the elongate member with a rolling action.
Dependencies are inferred from the claim text.