This invention relates to a handling apparatus and method. More particularly, but not exclusively, embodiments of the invention relate to a davit apparatus for use in the deployment of an object, such as a daughter craft, from a marine craft, and to a deployment method.
In many industries, there is a requirement to move objects from one location to another location and a wide variety of equipment and techniques have been developed for this purpose. In the marine industry, for example, many larger marine craft carry one or more smaller craft which can be deployed from and/or recovered to the larger vessel, the larger vessel typically being referred to as the mother ship while the smaller craft is referred to as the daughter craft or satellite craft. In some instances, deployment and/or recovery of the satellite craft may be by way of a ramp or slipway provided on the mother ship. In other instances, deployment and/or recovery may be by way of a crane or davit.
A davit typically comprises a frame or arm which supports the satellite craft and which is moved from a first, storage, position proximal to the mother ship to a second, more distal, position from which the satellite craft can be deployed, often by means of a winch.
Although davits are used successfully in many applications, there are nevertheless drawbacks associated with conventional systems and techniques. For example, a conventional davit used in the deployment of a satellite craft is typically manipulated using one or more hydraulic actuator; hydraulic actuators being used due to their ability to manipulate large loads and for their suitability for use in the marine environment. However, in order to ensure that the davit remains operational in the event of power loss—as required by International maritime regulations—there is a requirement to provide additional hydraulic capacity to supply the actuators where conventional power systems are not available. This additional capacity is typically provided in the form of hydraulic accumulators. However, while accumulators are capable of maintaining operation, such accumulators require a significant amount of deck space which is otherwise redundant during normal operation.
According to a first aspect, there is provided a handling apparatus for supporting and deploying an object, the handling apparatus operable between a first, storage, position and a second, deployment, position for deploying the object, the handling apparatus comprising:
a cradle for supporting the object to be deployed thereon, the cradle comprising a first cradle portion coupled to a second cradle portion, the first cradle portion movable from a first, extended, position relative to the second cradle portion in which the object is retained on the cradle by the first cradle portion to a second, retracted, position relative to the second cradle portion in which the object is released for movement relative to the cradle; and
a release arrangement operable to release the object for movement relative to the cradle, the release arrangement configured to move or permit movement of the first cradle portion to the second, retracted, position,
wherein the handling apparatus releasably retains the object and is configured, to move from the first, storage, position to the second, deployment, position to facilitate deployment of the object when the first cradle portion moves to the second, retracted, position.
Embodiments of the present invention beneficially provide a handling apparatus which is capable of operation in the event of power loss or where power is otherwise not available and which occupies a small footprint.
In particular embodiments, the handling apparatus comprises a davit. For example, the handling apparatus may comprise a davit for use in the deployment and/or recovery of a marine craft, such as a lifeboat, rigid inflatable boat (RIB) or the like. By permitting operation in the event of power loss or where power is otherwise not available, embodiments of the present invention may be particularly beneficial for use in safety critical systems, such as in the deployment of lifeboats.
The handling apparatus may be configured to move from the first, storage, position to the second, deployment, position as a result of the mass of the object to be deployed. For example, once the object has been released for movement relative to the cradle by the release arrangement, the mass of the object may move the handling apparatus from the first position to the second position for deployment of the object.
Movement of the object may initiate movement of the handling apparatus from the first position to the second position. For example, movement of the mass of the object may move the balance point of the handling apparatus to a position which causes the handling apparatus to move to the second position.
Movement of the object and/or the handling apparatus may occur as a result of manipulation of the position of the object by a deployment arrangement, for example comprising a winch arrangement, which forms part of the handling apparatus or with which the handling apparatus is operatively associated.
In use, the deployment arrangement may move the object, altering the balance point of the handling apparatus and causing the handling apparatus to move to the second position.
Alternatively, movement of the object and/or the handling apparatus may occur automatically, that is without external manipulation.
Alternatively or additionally, the handling apparatus may move from the first, storage, position to the second, deployment, position as a result of a change in the balance of mass of the handling apparatus caused by movement of the first cradle portion.
As outlined above, the first cradle portion is movable from the first, extended, position to the second, retracted, position in which the object is released for movement relative to the cradle. In particular embodiments, the first cradle portion may be pivotably coupled to the second cradle portion and the first cradle portion may be pivotable from the first, extended, position to the second, retracted, position, and vice-versa. Alternatively, or additionally, the first cradle portion may be axially movable relative to the second cradle portion.
The first cradle portion may define a retaining member of the handling apparatus. The first cradle portion may comprise a retaining flap.
The first cradle portion may be pivotably coupled to the second cradle portion via an axle.
The first cradle portion may comprise a plate.
The first cradle portion may comprise a framework.
The second cradle portion may comprise a deployment ramp.
The second cradle portion may comprise a plate.
The second cradle portion may comprise a framework. Beneficially, the provision of a framework reduces the mass of the handling apparatus. The second cradle portion may be rectangular.
The handling apparatus may comprise a support arrangement. In use, the support arrangement may support the cradle.
The support arrangement may comprise an arm.
The support arrangement may comprise a support frame.
The support frame may be pivotably coupled to a mounting surface. The mounting surface may comprise a deck or hull of a marine craft, such as a mother ship.
In use, the handling apparatus may move from the first, storage, position to the second, deployment, position by pivoting the support frame. The support frame may define a loading arm for deploying the object from the handling apparatus when in the deployment position.
The cradle may be disposed on the support arrangement, in particular the support frame of the support arrangement.
The cradle may be integrally formed with the support frame. However, in particular embodiments the cradle may be mounted to the support arrangement. For example, the second cradle portion may be mounted on the support frame. The second cradle portion may be secured to the support frame by any suitable means. For example, the second cradle portion may be secured to the support frame by bolts, a weld connection.
The second cradle portion may define a ramp angle with respect to the support frame. The second cradle portion may be mounted on the support frame by a plurality of legs. The legs may have varying length, the lengths of the legs progressively increasing from a first, proximal, end of the cradle to a second, distal, end of the cradle. The support arrangement may comprise an anchor mount, such as an anchor plate arrangement. The anchor mount may secure the handling apparatus to the mounting surface. The anchor mount may be secured to the mounting surface by any suitable means. For example, the anchor mount may be secured to the mounting surface by bolts or a weld connection.
The support frame may be pivotably coupled to the mounting surface via the anchor mount, for example but not exclusively via an axle. In particular embodiments, the support frame may be modular. The support frame may comprise a support frame assembly. The support frame assembly may comprise a plurality of beams. The support frame assembly may comprise a plurality of nodes. In use, the nodes and beams form a framework.
In other embodiments, the support frame may comprise a unitary construction.
The support frame may be constructed from any suitable material. For example, the support frame may be constructed from a metallic material. The support frame may be constructed from steel. In particular embodiments, however, the support frame may be at least partially constructed from a composite material, in particular but not exclusively a GRP composite material. For example, in embodiments where the support frame comprises a support frame assembly, at least one of the beams of the support frame assembly may be constructed from a composite material, such as a GRP composite material. Beneficially, providing the beams from a composite material reduces weight and improves corrosion resistance of the handling apparatus while providing the required strength to support and manipulate the load forces exerted on the support frame in use.
As outlined above, the release arrangement is operable to release the object for movement by moving or permitting movement of the first cradle portion to the second, retracted, position.
In particular embodiments, the release arrangement is manually operable. Beneficially, this facilitates operation of the handling apparatus when power is lost or is otherwise unavailable.
In a first configuration, the release arrangement may be configured to prevent movement of the first cradle portion relative to the second cradle portion. In a second configuration, the release arrangement may be configured to permit movement of the first cradle portion relative to the second cradle portion.
The release arrangement may comprise a sleeve. The sleeve may be configured for movement from a first position in which movement of the first cradle portion is prevented to a second position in which the first cradle portion is released for movement relative to the second cradle portion. The sleeve may, for example, be configured for axial movement from the first position to the second position.
The release arrangement may comprise a lock. The lock may be provided between the first cradle portion, in particular but not exclusively between an axle of the first cradle portion, and the sleeve. In use, the lock may be unlocked by movement of the sleeve.
The lock may comprise a locking dog, such as a ball, and in particular embodiments the lock may comprise a plurality of circumferentially arranged locking dogs.
The locking dogs or dogs may be disposed in a groove or pockets provided in the first cradle portion.
In the first configuration, radially outward movement of the locking dog or dogs may be prevented by the sleeve.
The sleeve may comprise a recess. In use, axial movement of the sleeve may align the recess with the locking dog or dogs, permitting the locking dog or dogs to move radially outwards, and thereby release the first cradle portion for movement.
The release arrangement may comprise a mandrel. In use, the mandrel may provide mounting for the sleeve.
The mandrel may be hollow. The mandrel may define, or may be coupled to, a flange. The flange may secure the mandrel to the support frame. The mandrel may comprise a number of circumferentially spaced bores through which the locking dog or dogs extend.
The release arrangement may be biased towards its first configuration. The release arrangement may comprise a biasing member, such as a spring. In use, the biasing member may bias the sleeve towards the first position
The handling apparatus may comprise an actuator arrangement.
In particular embodiments, the actuator arrangement may comprise a plurality of actuators.
The actuator arrangement may comprise a linear actuator.
The actuator arrangement may comprise at least one of a hydraulic actuator; an electric actuator; a pneumatic actuator; a mechanical actuator, such as a screw jack; or the like.
In use, and in conditions where power is available to the actuator, the actuator may be operable to move the handling apparatus from the first, storage, position to the second, deployment, position to facilitate deployment of the object. However, in conditions where power is not available to the actuator, the handling apparatus remains operational between the first and second positions, since the handling apparatus can move between the first and second positions, where required. In either case, the actuator may assist in controlling movement of the handling apparatus between the first and second positions.
The apparatus may comprise, or may be operated associated with, a deployment arrangement. In particular embodiments, the deployment arrangement may comprise a winch arrangement. Alternatively, or additionally, the deployment arrangement may comprise a pulley system or the like. The deployment arrangement may comprise a hydraulic deployment arrangement. The deployment arrangement may comprise an electric deployment arrangement. The deployment arrangement may comprise a manual deployment arrangement.
The handling apparatus may comprise or may be operatively associated with a control system. The control system may control operation of the actuator. The control system may control operation of the deployment arrangement.
The object may comprise a marine craft. In particular embodiments, the object may comprise a daughter vessel or craft such as a lifeboat, rigid inflatable boat (RIB) RIB or the like. Alternatively, the object may comprise cargo.
According to a second aspect, there is provided a method comprising:
providing a handling apparatus comprising: a cradle for supporting an object to be deployed thereon, the cradle comprising a first cradle portion coupled to a second cradle portion; and a release arrangement operable to release the object for movement relative to the cradle;
operating the release arrangement by moving the first cradle portion from a first, extended, position relative to the second cradle portion to a second, retracted, position relative to the second cradle portion, in which second position the object is released for movement relative to the cradle; and
moving the handling apparatus between a first, storage, position and a second, deployment, position suitable for deploying the object.
The method may comprise deploying the object.
The method may comprise operating a deployment arrangement to move the object. Following release of the object by the release arrangement, movement of the object by the deployment arrangement may alter the balance point of the handling apparatus and cause the handling apparatus to move to the second position.
It should be understood that the features defined above in relation to any aspect, embodiment or arrangement or described below in relation to any specific embodiment or arrangement may be utilised, either alone or in combination with any other defined feature.
These and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Referring first to
As will be described further below, the davit 10 releasably retains the object 12 and is configured so that, once released, the davit 10 moves from the first, storage, position to the second, deployment, position to facilitate deployment of the object 12.
In the illustrated embodiment, the davit 10 is mounted to the deck 14 of a marine craft 16 and the object 12 to be deployed is a daughter craft, such as a lifeboat, rigid inflatable boat (RIB) or the like. A davit 10 according to embodiments of the present invention is particularly beneficial for use in safety critical systems, such as deployment of lifeboats However, it will be recognised that the davit 10 may be mounted on any structure, including for example but not exclusively a floating platform, a dock or other land-based structure or the like and the object 12 may comprise any object suitable for deployment.
As shown in
A retaining flap 24 forms a first portion of the cradle 20 and is pivotably coupled to a deployment ramp 26 which forms a second portion of the cradle 20. In the illustrated embodiment, the deployment ramp 26 does not form a continuous planar ramp surface but rather comprises a rectangular framework. Beneficially, the framework reduces the mass of the structure.
As shown more clearly in later Figures, the retaining flap 24 is pivotably coupled to the deployment ramp 26 via an axle 28 and, in use, the retaining flap 24 is pivotable between a first position which retains the object 12 on the cradle 20 (as shown in
In the illustrated embodiment, the retaining flap 24 comprises a rectangular plate. However, in other embodiments the retaining flap 24 may take other forms, such a framework.
The deployment ramp 26 of the cradle 20 is mounted to the support frame 18 via legs 30. As shown, the legs 30 have varying length, the lengths of the legs 30 progressively increasing from a first, proximal, end of the cradle 20 to a second, distal, end of the cradle 20. The deployment ramp 26 thus defines a ramp angle A with respect to the support frame 18.
As shown in
Two linear actuators 36 are disposed between the support frame 18 and the deck 14. In the illustrated embodiment, the actuators 36 comprise hydraulic actuators. However, the actuators 36 may alternatively comprise electric actuators, pneumatic actuators, mechanical actuators such as a screw jacks or the like.
In use, and in conditions where power is available to the actuators 36, the winch arrangement 22 is utilised to lift the object 12 from the cradle 20 and the actuators 36 are operable to move the davit 10 from the first, storage, position to the second, deployment, position to facilitate deployment of the object 12. However, in conditions where power is not available to the actuators 36, the davit 10 remains operational between the first and second positions, since the davit 10 can move between the first and second positions, where required, by pivoting the retaining flap 24 between its first, retaining, position and its second position in which the object 12 is released for movement relative to the cradle 20. In either scenario, the actuators 36 may also provide the additional functions of controlling the rate of deployment of the davit 10 between the first and second positions and thus acting as a damper, and/or limiting the extent of travel of the davit 10.
As shown in
As described above, and referring now also to
The release arrangement 44 is secured to the support frame 18 via an L-shaped bracket 46. In the illustrated embodiment, the release arrangement 44 comprises a hollow mandrel 48, a first end portion 50 of the mandrel 48 defining a flange 52 for securing the release arrangement 44 to the bracket 46 and a second end portion 54 of the mandrel 48 comprising a number of circumferentially spaced bores 56 for receiving locking dogs 58—which in the illustrated embodiment take the form of balls. As shown in
As described above, in conditions where power is available to the actuators 36, the winch arrangement 22 is utilised to lift the object 12 from the cradle 20 and the actuators 36 are operable to move the davit 10 from the first, storage, position to the second, deployment, position to facilitate deployment of the object 12. However, in conditions where power is not available the davit 10 remains operational since the release arrangement 44 can be initiated manually by pushing sleeve 64 towards flange 52. In some embodiments, a handle or lever (not shown) may be provided to effect movement of the sleeve 64. However, in the illustrated embodiment, a handle or lever is not required.
Operation of the davit 10 will now be described with reference in particular to
It should be understood that the embodiment described herein is merely exemplary and that various modifications may be made thereto without departing from the scope of the invention.
For example,
Another alternative release arrangement 44″ is shown in
Number | Date | Country | Kind |
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1520333.4 | Nov 2015 | GB | national |