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A remote handling manipulator having a slave arm and a manually operated controller with a grip mechanism, is provided with a force feedback system to impose a force resisting operation of the grip mechanism related to a load experienced by the slave arm. A jaw mechanism of the slave arm is operated

A remote handling manipulator having a slave arm and a manually operated controller with a grip mechanism, is provided with a force feedback system to impose a force resisting operation of the grip mechanism related to a load experienced by the slave arm. A jaw mechanism of the slave arm is operated by a pressurized fluid, and in the system the pressure of the fluid and the effort exerted by the grip mechanism are compared to produce an error signal used for regulating the force applied to the grip mechanism.

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1. A manipulator comprising, a slave arm with at least one movement thereof operable by fluid power means; a manually operated grip means for controlling the movement of the slave arm; positional transducers at the slave arm and the grip means to provide positional signals representing the positions

1. A manipulator comprising, a slave arm with at least one movement thereof operable by fluid power means; a manually operated grip means for controlling the movement of the slave arm; positional transducers at the slave arm and the grip means to provide positional signals representing the positions of the slave arm and of the grip means, means for comparing the positional signals and providing a difference signal representing the difference between the positional signals, and a servo-valve and a pressure control valve each responsive to the difference signal and arranged to operate the fluid power means; means for monitoring the fluid pressure of the fluid power means and providing a pressure signal, a load transducer for monitoring the load on the grip means and providing a load signal, comparator means for comparing pressure and load signals from the pressure monitoring means and the load transducer and providing an error signal representing the difference between the pressure and load signals, and a fluid power means connected to the grip means and operable in response to the error signal so as to impose on the grip means a load proportional to the said fluid pressure. 2. A manipulator as claimed in claim 1, wherein means are provided for multiplying or reducing the signal received by the comparator means from the load transducer, so as to multiply or reduce the imposed load. 3. A manipulator as claimed in claim 1 also comprising resilient means connected between the grip means and the second-mentioned fluid power means, the load imposed on the grip means being due to the resilience of the resilient means. 4. A manipulator as claimed in claim 1 wherein the slave arm is arranged to be demountably connected to a support means located in a hostile environment, the support means being connectable to a said grip mechanism located outside the hostile environment. 5. A manipulator as claimed in claim 2 wherein the slave arm is arranged to be demountably connected to a support means located in a hostile environment, the support means being connectable to a said grip mechanism located outside the hostile environment. 6. A manipulator as claimed in claim 3 wherein the slave arm is arranged to be demountably connected to a support means located in a hostile environment, the support means being connectable to a said grip mechanism located outside the hostile environment.