Subsea Torque Tool Latch Assembly for Reliable Power-Loss Disengagement

The patent replaces the hydraulically actuated latch mechanism with an electric motor-driven latch mechanism. The electric motor receives power from the ROV's power source and includes a latch arm that can be actively controlled to engage or disengage from the subsea component. This substitution eliminates the reliability issues of hydraulic systems while providing active control capability through the electric motor, allowing the latch to be reliably engaged or disengaged even during power loss conditions.

The patent integrates the latch mechanism and socket mechanism into a unified structure where the electric motor serves dual functions: driving the socket rotation and controlling the latch engagement/disengagement. The latch arm is positioned to engage with the subsea component while the socket provides torque. This integrated design maintains stability during operation while allowing the same power source to control both functions, enabling reliable disengagement by simply reversing the motor direction.

The patent incorporates a torque sensor that continuously monitors the torque being applied to the subsea component. The sensor provides feedback to the control system, which compares the measured torque against a predetermined maximum safe torque threshold. When the torque approaches or exceeds this threshold, the control system automatically reduces or stops motor power output, preventing excessive torque application. This feedback mechanism ensures task completion while protecting the component from damage.