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A securing device comprises an axially reciprocable drive shaft which has a head adapted to pass forwards through a detent plate. The head is adapted to engage the plate after rotation. A cam slot is defined in a drive housing and is engageable by a cam follower carried on the drive shaft. The cam s

A securing device comprises an axially reciprocable drive shaft which has a head adapted to pass forwards through a detent plate. The head is adapted to engage the plate after rotation. A cam slot is defined in a drive housing and is engageable by a cam follower carried on the drive shaft. The cam slot has two end portions extending parallel to the axis of the drive shaft and an oblique intermediate part such that the drive shaft is rotated when the follower moves along the intermediate part and the drive shaft moves only axially when the follower moves along either of the end portions. A subsea assembly including the securing device includes a fixed stab plate including a central collar, and a free stab plate having an aperture through which said collar extends, the collar including an chamber defined by the detent plate.

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What is claimed is: 1. A subsea securing device comprising:a wall member including a key aperture;a drive shaft longitudinally reciprocable axially forwards and backwards and having at one end a head adapted to pass forwards through said key aperture when the drive shaft is in at least a first angul

What is claimed is: 1. A subsea securing device comprising:a wall member including a key aperture;a drive shaft longitudinally reciprocable axially forwards and backwards and having at one end a head adapted to pass forwards through said key aperture when the drive shaft is in at least a first angular position, the head being adapted to engage the wall member when the drive shaft is in a second angular position and is moved backwards;a drive housing which defines at least one cam slot, said cam slot having two portions extending parallel to the axis of the drive shaft and an intermediate part extending obliquely between said portions; anda cam follower for engagement with said cam slot and carried by said drive shaft;whereby said drive shaft is rotated between said angular positions when said cam follower moves along said intermediate part and said drive shaft moves only axially when said cam follower moves along either of said portions.