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1. (WO2019009736) DISPOSITIF DE PRÉHENSION POUR MANIPULER UN ÉQUIPEMENT AVEC UN TRAIN DE TIGES DE FORAGE
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C l a i m s

1. A gripping device (1) adapted for handling equipment (10) with a drill string

(5) , wherein an annular actuator housing (2) includes a hydraulically activated, rotatable cam disc (4) which is arranged to displace a number of locking slides (3) from a first position, in which the locking slides (3) are retracted into the actuator housing (2), and a second position, in which the locking slides (3) are in engagement with the drill string (5) extending through a centre opening (2B) in the gripping device (1), by abutting against a shoulder of a tool joint (5A) in the drill string (5), c h a r a c t e r i z e d i n that the gripping device (1) is connected to a hydraulic supply and return for the actuation of the cam disc (4) via a hydraulic coupler (8A) in a connection port (7C) on the actuator housing (2), and that alternately pressurizing and ventilating two adjacent actuation volumes (4A, 4B) in the cam disc (4) brings about rotation of the cam disc (4) within a sector of the cam disc (4).

2. The gripping device (1) according to claim 1, wherein the locking slides (3) are provided with dynamic seals (3E).

3. The gripping device (1) according to claim 1, wherein the hydraulic coupler (8A) is arranged externally on a receiver unit in the open sea, or externally on a riser (9), and includes a hydraulic actuator (8B) which is arranged to move the hydraulic coupler (8A) into or out of a connection port (7C) in the actuator housing (2) through an opening in the receiver unit or the pipe (9) surrounding the gripping device (1).

4. The gripping device (1) according to claim 1, wherein a spring-loaded peg

(6) is arranged to engage with a first or a second recess in the cam disc (4) and hold the cam disc (4) in position, when the locking slides (3) have been pushed out into the second position and when the locking slides (3) are in the first position, respectively.

5. The gripping device (1) according to claim 1, wherein the locking slides (3) are provided with check valves (3A) which, via bores (3B), are arranged to let liquid through from a rear side of the locking slides (3) when the locking slides (3) are being returned to the first position.