Normalair-garrett (holdings) Limited

Normalair-garret (holdings) Limited

Alistair L Carnegie

A deep diving breathing system in which a breathable gas mixture is circulated through a diving helmet by a push-pull pump includes an inlet flow control valve, an outlet gas flow regulator valve, and a bleed valve. The bleed valve operates in response to the pressure of gas flowing from the outlet gas flow regulator valve to bleed gas from a gas supply line upstream of the inlet flow control valve. The system facilitates diving operations from a diving bell at a range of depths and recovery of helium in a helium-oxygen breathing gas mixture.

Deep diving breathing systems

A mechanical hand has a rigid enclosure for housing the hand of a user, and at least one pair of gripping elements are provided on the rigid hand enclosure. One of these gripping elements is pivotally attached to the enclosure so as to be capable of movement towards and away from the other gripping element. Movement of the movable gripping element, at least towards the other gripping element, is provided by an hydraulic actuator arrangement that includes fluid pressure control means responsive to a manually movable member housed within the rigid hand enclosure. The arrangement is such that a force applied to the manually movable member by the hand of a user effects rapid movement of the pivotal gripping element until an object is being held between the pair of gripping elements, at which time the force applied to the manually movable member is translated into a force that is applied through the pivotal gripping element to exert a firm grip on the object. The hand is particularly suitable for use with a deep diving suit.

Mechanical hands

A wall structure for use in forming part of an enclosure that is subject to high pressure differential between its external and internal environments comprises tubing that has been flattened over two diametrically opposed areas and helically wound so as to be contiguous along the flattened areas. The interior of the tubing is filled with a substantially incompressible flexible medium. Means are provided for pressurizing the flexible medium, at least during periods of operation when the enclosure is subjected to a substantial pressure difference between its external and internal environments, so as to balance some of the loads acting on the wall structure due to the pressure differential. The wall structure is particularly suitable for use in forming parts of a deep diving suit or other deep diving and submersible enclosures.

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Yeovil, United Kingdom

Alistair L Carnegie