Patent Description:
Loads can be suspended by forklifts, wheel loader overhead cranes such as boom and jib cranes and many other machines that can lift a load higher than ground level.

Most accidents on onshore and offshore sites are related to load lifting and handling. During connection and disconnection of a load to a lifting apparatus such as a crane, accidents may occur due to external forces such as such as inclement weather. High winds may cause the load to move and change orientation. This can be problematic for crane operators trying to maintain a stable position whilst the load is connected/ disconnected to the lifting device.

Current load handling and positioning systems involve ground workers manually connecting the load to the lifting device and dragging the load via the guide ropes into a desired position. This handling operation can be problematic due to the physically demanding nature of the equipment especially when the work is carried out under adverse weather conditions.

Problems can also occur when there is miscommunication between the crane operator and ground workers. Such issues can result in collision of the load with obstacles leading to damage of the load and/or the obstacles and risks to personnel.

Due to the complexity of the handling operation and the safety protocols for the on-site workers, any operation requiring the connection/disconnection and movement of loads must be pre-planned to ensure that at no point a worker is required to work in proximity to the suspended load. This can impose restrictive working conditions when the area to maneuver the load is small.

There is a high risk of serious injury or death if a suspended load should fall during handling operations. Due to the need to securely connect the load to the lifting apparatus and the nature of the use of guide ropes to orient the load, the workers are required to be in close proximity of the load and are therefore at an increased risk of danger. The level of danger increases as the weight and size of the load increases. <CIT> relates to a latching apparatus for sequentially latching and unlatching two objects. The latching apparatus includes a cylinder attached to the first object and including a first opening, and a second opening laterally disposed to the first opening, a spring loaded piston including a circumferential wall disposed in the first opening, a shank axially extending from the piston and defining a transverse latch pin at an end thereof, and a spring loaded plunger disposed within the second opening. The wall defines a contiguous cam-groove thereon. The cam-groove includes alternating upper and lower nodal points with straight and inclined segments therebetween. The plunger slidably engages the cam-groove to co-operatively execute one or more of a translation, and a rotation of the shank such that the latch pin rotatably extends or retracts into or out of the slotted opening on the locking plate of the second object. <CIT> relates to a system for use with a crane on a surface vessel, comprising a crane tool attached or attachable to a hoisting cable of the crane and one or more adaptors attached or attachable to one or more tools for carrying out operations or to one or more components, the crane tool comprising a connector and at least one of the adaptors comprising a connector-counterpart. <CIT> relates to a safety grapple for releasably joining an object to be moved to a device for moving the same. Provision is made to cycle the grapple through at least two release procedures before actual release can be effected. This is accomplished through the use of lug actuator cam plate which rotates unidirectionally a selected amount for each upward and downward movement of a central shaft of the grapple. This cam, with cam followers mounted on the lugs, is shaped such that the lugs are pivoted out of engagement with the object only after a selected number of shaft reciprocations. In a specific embodiment, the grapple requires two full cycles of shaft movement before lug release is effected on the third cycle. This prevents inadvertent release of the object, a feature especially important in the handling of hazardous material. The actuator cam rotation is effected by a first and a further toothed indexing cam directly connected to the actuating cam, and a cam follower mounted from the shaft that moves between these toothed cams as the shaft is reciprocated.

It is the object of some aspects of the present invention to obviate or at least mitigate the foregoing disadvantages of prior art load handling systems.

It is an object of some aspects of the present invention to provide a system which is designed for easy and rapid connection and disconnection of a load to and from a lifting device.

It is another object of some aspects of the present invention to provide a system configured to enable a crane operator to remotely connect and disconnect a lifting device to a load and accurately control the positioning of a load and to allow the crane operator to maintain full control of the orientation of the load.

A further object of some aspects of the present invention is to reduce the risk of injury to on-site workers who work in close proximity to the load handling apparatus. Further aims of certain aspects of the present invention will become apparent from the following description.

According to certain aspects of the present invention, there is provided a system for connecting a lifting device to a load to be lifted; the system comprising:.

The first connector member may comprise a first latch member and the second connector may comprise a second latch member. The first latch member and the second latch member may be configured to reversibly couple in response to a first series of longitudinal movements of the first connector member. The first latch member and the second latch member may be configured directly connected to the actuating cam, and a cam follower mounted from the shaft that moves between these toothed cams as the shaft is reciprocated.

According to the invention, there is provided a system for connecting a lifting device to a load to be lifted, according to the independent claim <NUM>. Further aspects of the system are defined in the dependent claims <NUM>-<NUM>.

According to the invention, there is also provided a method of connecting a load to a lifting device, according to the independent claim <NUM>. Further aspects of the method are defined in the dependent claims <NUM>-<NUM>.

There will now be described, by way of example only, embodiments of the invention with reference to the drawings, of which:.

The system may be controllable from a remote position. The second connector member may be remotely moved in a first series of longitudinal movements to couple or connect the first connector member to the second connector member. The second connector member may be remotely moved in a second series of longitudinal movements to de-couple or disconnect the first connector member from the second connector member.

The first connector member may comprise a torque ring. The torque ring may be described in a shape in a plane in which it is oriented. The shape may be substantially circular, elliptical, oval or polygon such as triangular, square, rectangular, pentagonal, hexagonal. In some embodiments, the shape of the torque is circular.

The torque ring may have a plurality of teeth arranged on its inner surface. The plurality of teeth may be machine formed on the inside diameter of the torque ring.

The dimensions of the torque ring may vary depending on the dimensions of the suspended load. In some embodiments, the torque ring has a diameter of <NUM>.

By providing a torque ring, external forces such as torque may be transmitted from the lifting device to the load and vice versa with minimal torque force being transferred through the latching mechanism and therefore may mitigate accidental release of the load from the lifting device.

The second connector member may comprise at least one fin configured to engage the teeth of the torque ring. The at least one fin may be configured to transmit torque from the second connector member to the teeth on the torque ring and to the first connector. The plurality of teeth on the torque ring may be configured to transmit torque from the first connector member to the fins on the second connector.

Providing a torque ring with multiple teeth may allow small degrees of torque to be accurately transmitted to and from the load during handling.

The second connector member may comprise a first and second section. The second latch member may be located on the first section. The at least one fin may be located on the second section. The first section and second section may be configured to rotate independently from one another in a first condition. The first section and second section may be rotational coupled in a second condition. The first condition may be when no upward lifting force is applied to the second connector member. The second condition may be when an upward lifting force is applied to the second connector member.

The second connector may comprise a clutch mechanism movable between the first condition in which the first and second sections are configured to rotate independently from one another and a second condition in which the first and second sections are rotationally coupled.

The first connector member may comprise a funnel configured to guide or direct the second connector member into at least a portion of the first connector member. The first connector member may comprise a funnel-shaped aperture configured to guide or direct the second connector member toward into at least a portion of the first connector member.

The first connector member may have at least one lug or eyelet to connect the first connector member to the load. The second connector member may have at least one lug or eyelet to connect the second connector member to the lifting device. The lifting device may be a crane, derrick, or similar lifting gear.

Embodiments of these aspects of the invention may include one or more features of the previous aspects of the invention or its embodiments, or vice versa.

According to certain aspects of the present invention, there is provided a system for lifting a load
comprising:.

The second connector member may comprise a clutch mechanism movable between a first condition in which the first and second sections are configured to rotate independently from one another and a second condition in which the first and second sections are rotationally coupled.

The above-described system may facilitate the remote connection and disconnection of a lifting device to a load to be lifted. This system may allow the second section to rotate independently from the first section such that latching mechanism may be moved to the lock position to latch the first connector member and second connectors. Once the latch mechanism has locked, the clutch mechanism may be moved to the second position to rotationally couple the first and second sections to allow the effective transfer of torque after the first connector member and second connector members have been latched.

The system may prevent injury to workers as the connection, lifting, orientation, and/or disconnection of the load can be controlled and effected remotely. In the unlikely event of damage or failure of an element of the system, it would likely not result in serious injuries as no personnel would be in the vicinity of the load.

Embodiments of these aspects of the invention may include one or more features of the previous aspects of the invention or its embodiments, or vice versa.

According to certain aspects of the present invention, there is provided a method of connecting a load to a lifting device, the method comprising:.

The method may comprise decoupling or disconnecting the first connector member and the second connector member by moving the second connector member in a second series of longitudinal movements relative to the first connector member.

According to certain aspects of the present invention, there is provided a method for connecting a lifting device to a load to be lifted; the method comprising:.

The method may comprise lowering at least a portion of the second connector into at least a portion of the first connector. The method may comprise operating the lifting device to move the second connector member in a series of longitudinal movements.

The series of longitudinal movements may be a predetermined sequence of downward and upward longitudinal movements of the second connector member relative to the first connector member.

The method may comprise longitudinal movements of the second connector member to position a pin or stud located on the first connecter member in a track of an indexer mechanism located on the second connector member. The method may comprise moving the second connector member until the pin or stud is located in a load bearing slot in the indexer mechanism.

The second connector member may comprise a first section and a second section. The first section may be connectable to the lifting device and the second section may be configured to reversibly couple to the first connector member. The first and second sections may be configured to rotate independently from one another in a first condition and configured to be rotationally coupled in a second condition. The method may comprise connecting the second section to the first connector member in a first condition. The method may comprise moving the second connector member in a sequence of longitudinal movements to latch the first connector member and the second connector member. The method may comprise moving first and second sections to the second condition by applying a lifting force to the second connector member.

Embodiments of these aspects of the invention may include one or more features of any of the previous aspects of the invention or its embodiments, or vice versa.

According to certain aspects of the present invention, there is provided a method of remotely connecting lifting device to a load, the method comprising:.

The method may comprise moving the second connector member in a series of longitudinal movements relative to the first connector member whilst the load is supported on the ground and no lifting force is applied to the load. The method may comprise de-coupling the first latch member from the second latch member by supporting the load on a surface and moving the second connector member in a second series of longitudinal movements relative to the first connector member.

The method may comprise disconnecting the lifting device from a load by moving the second connector member in a series of longitudinal movements relative to the first connector member whilst no lifting force is applied to the load.

According to certain aspects of the present invention, there is provided a method of lifting load, the method comprising:.

The method may comprise transferring torque from the load to the lifting device. The method may comprise transferring torque from the first connector member to the first section.

The method may comprise transferring torque from the load to the connected torque ring of the first connector member, the torque ring subsequently acting on the first section of the second connector to transfer the torque to the lifting device.

The method may comprise transferring torque from the lifting device to the load. The method may comprise transferring torque from the first section to the first connector member. The method may comprise transferring torque from the lifting device or a torque generating device to the connected first section and to a torque ring of the first connector member to the connected load.

According to certain aspects of the present invention, there is provided a load lifting system for a crane, the load lifting system comprising the load connection system according to the previous aspects of the invention.

Referring firstly to <FIG>, there is shown generally depicted at <NUM>, a lifting system. The system <NUM> comprises a first connector member namely a load connector apparatus <NUM> and a second connector member namely a lift connector apparatus <NUM>. In <FIG> the load connector apparatus <NUM> and a lift connector apparatus <NUM> are shown in a coupled condition to allow a load (not shown) attached to the load connector apparatus <NUM> to be connected to a lifting device (not shown) attached via the lift connector apparatus <NUM>.

The load connector apparatus <NUM> has a generally cylindrical body <NUM> which forms a chamber <NUM> to receive a portion of the lift connector apparatus <NUM>. The body <NUM> has a plurality of arms <NUM> which extend from an upper end 16a of the body <NUM> around its circumference and provide support to a torque ring <NUM>. In some examples, four arms support the torque ring <NUM>. However, it will be appreciated that different number of arms or arm designs may be used to support the torque ring <NUM>.

As best shown in 2A and 2B, the torque ring <NUM> has a plurality of teeth <NUM> on the inner surface of the ring <NUM> designed to engage the lift connector apparatus <NUM>. In some examples, the ring has a diameter of <NUM> ring with teeth <NUM> having a rounded shape or profile. However, it will be appreciated that a variety of teeth designs, a different number of teeth and ring diameters may be used.

<FIG> shows the features of the load connector apparatus with the lift connector apparatus <NUM> removed for clarity. The body <NUM> has a number of eyelets <NUM> which extend from the body <NUM> around its circumference to enable the load connector apparatus to be connected to a load via slings (not shown). The load connector apparatus <NUM> has three legs <NUM> located at the base 16b of the load connector apparatus <NUM> to be lifted. The body <NUM> has a bore <NUM> or central passage with studs <NUM> projecting from the inner surface 28a of the bore <NUM> into the bore <NUM>. The studs are designed to engage a latch mechanism on the lift connector apparatus <NUM> discussed further in relation to <FIG>.

The three legs arrangement shown in <FIG> ensures that all legs are touching the ground or load providing stability even if the apparatus is located on an uneven ground or load. However, it will be appreciated that a different number of legs may be used.

<FIG> show a lift connector apparatus <NUM> having a body <NUM>. The body <NUM> has an upper section 32a and a lower section 32b. A lower end <NUM> of the lower section 32b has a generally semi-spherical shape which aids in guiding the lift connector apparatus into the bore <NUM> of the load connector apparatus <NUM>. It will be appreciated that the lower end <NUM> may alternatively have a pointed or cone-shape to reduce the likelihood of the lift connector apparatus <NUM> being stuck as it enters the bore of the load connector apparatus <NUM>.

The upper section 32a of the body <NUM> has a plurality of fins members <NUM> projecting outward from the outer surface 32c of the upper section 32a. In some embodiments, six fin members <NUM> are arranged around the circumference of the outer surface 32c of the upper section 32a.

The lower section 32b has an indexer sleeve or mechanism <NUM> comprising a circumferential track <NUM> on its outer surface. The dimensions of the track are designed to accommodate the studs <NUM> on the load connector apparatus <NUM>.

Together the indexer mechanism or sleeve and the studs act as a latching mechanism to couple the lift connector apparatus and the load connector apparatus.

As best shown in <FIG>, the indexer mechanism <NUM> is located on the outer surface 32d of the lower section 32b. The indexer mechanism <NUM> may be a sleeve retained on the outer surface 32d or is integrated as the part of the lower section 32b.

As best shown in <FIG>, the track <NUM> in the indexer sleeve <NUM> has a plurality of stud inlets/outlets <NUM> and load bearing slots <NUM> arranged around its circumference. When the studs <NUM> enter the tracks <NUM> via the inlet <NUM> and move to the load bearing slot <NUM>, the lift connector apparatus <NUM> is locked and coupled to the load connector apparatus <NUM> which allow the load connector apparatus to be picked up, moved to a desired position and lowered into place. Subsequent movement of the studs from the load bearing slot <NUM> to the outlet <NUM> allows the lift connector apparatus <NUM> to be removed from the load connector apparatus.

<FIG> shows a schematic of the clutch mechanism located in the lift connector apparatus. The clutch mechanism <NUM> is located between the upper section 32a and the lower section 32b. The lower section 32b has a shaft <NUM> around which the upper section 32a is mounted. At an upper end 61a of the shaft <NUM> is an upper clutch member 66a which has a set of square jaw teeth 67a. The upper clutch member 66a is designed to engage a lower clutch member 66b which has a corresponding set of square jaw teeth 67b. A compression spring <NUM> is arranged around the shaft <NUM> and holds the clutch mechanism in an open clutch condition as shown in <FIG> where the upper clutch member 66a is axial spaced apart from the lower clutch member 66b.

In a first clutch position shown in <FIG>, the upper section is free to rotate about shaft <NUM>. The upper and lower sections may rotate independently from one another.

An upper surface 32e of the lift connector apparatus <NUM> has an eyelet <NUM> designed to be coupled to a crane (not shown). The lift connector apparatus has a bearing surface <NUM> between the upper section 32a and lower section 32b which allows the upper section 32a rotate independently to the lower section 32b about shaft <NUM>.

When an upper force in the direction shown as arrow "U" in <FIG> is applied by the crane on the lift connector apparatus, the upper section 32a is moved upwards in the direction shown as arrow "U", which brings the teeth 67b of the lower clutch member 66b in contact with the teeth 67a of the upper clutch member 66a where they mesh. The clutch mechanism is then in a closed clutch condition and the upper section 32a and the lower section 32b of the lift connector apparatus are rotationally coupled.

In use, the load connector apparatus <NUM> is connected to a load to be moved via slings attached to lifting eyelets <NUM>. The lift connector apparatus <NUM> is connected to a lifting device such as a crane by eyelet <NUM> on the upper section 32a.

The crane operator maneuvers a lifting hook connected to the lift connector apparatus such that the lower end <NUM> passes through the torque ring <NUM> and enters the bore <NUM> of the load connector apparatus <NUM>. The torque ring <NUM> creates a target for the crane operator to aim for with the lift connector apparatus <NUM>.

As the lift connector apparatus <NUM> is lowered into the bore <NUM> of the load connector apparatus <NUM>, the fins <NUM> engage the grooves 22a between the teeth <NUM> on the torque ring which assists in guiding the lift connector apparatus <NUM> into the correct operational position and aids the indexer mechanism on the lift connector apparatus <NUM> to approach the studs <NUM> on the inner surface of the bore <NUM> in the correct orientation. The teeth <NUM> on the torque ring keep the lift connector apparatus <NUM> in a substantial vertical orientation which assist the studs <NUM> to connect with the indexer mechanism <NUM>. The rounded profile of the teeth <NUM> assist in the fins <NUM> locating the grooves 22a. Relative movement of the lift connector apparatus <NUM> relative to the load connector apparatus <NUM> determines which track in the indexer mechanism the studs enter.

Under the effects of gravity, the weight of the lift connector apparatus <NUM> moves the lift connector apparatus in a downward direction shown as arrow "A" in <FIG> until the studs <NUM> located on the inner surface 28a of the bore <NUM> of the load connector apparatus <NUM> enter the track inlets <NUM> in the indexer mechanism <NUM>.

Under the weight of the lift connector apparatus <NUM>, the studs <NUM> travel along track 45a in the indexer mechanism <NUM> and contact inclined shoulder <NUM> in the track, and the studs <NUM> are directed into upper slot <NUM>. This action rotates the lower section 32a of the lift connector apparatus <NUM> relative to the upper section 32b. As the clutch mechanism <NUM> is in the open clutch condition the upper section 32a and lower section 32b are free to rotate independently of one another.

When the studs <NUM> are in the upper slot <NUM> of the indexer mechanism, the lift connector apparatus <NUM> cannot be lowered any further in direction "A". The crane operator moves the lift connector apparatus <NUM> in a predetermined sequence of longitudinal movements. In this case it is moved in an upward direction shown as arrow "B" in <FIG>. This upward movement or jolt results in the stud <NUM> travelling along track <NUM> in the indexer mechanism <NUM> and contacting inclined shoulder <NUM> in the track which directs the stud <NUM> into load bearing slot <NUM>. When the studs <NUM> are located in the load bearing slots <NUM> they are constrained against rotation by shoulders <NUM> and <NUM> and the downward force "F" acting on the studs by the load. The lift connector apparatus <NUM> and load connector apparatus <NUM> are reversibly coupled together as shown in <FIG>.

As the indexer mechanism <NUM> of the lower section of the lift connector apparatus is maneuvered to position the studs <NUM> in load bearing slot <NUM>, the fins <NUM> on the upper section are positioned in grooves <NUM> between teeth <NUM> on the torque ring <NUM>. The lower section 32b is able to rotate about the longitudinal axis relative to the upper section by bearing <NUM>.

When the studs <NUM> are positioned in load bearing slot <NUM> the fins <NUM> are securely positioned in grooves 22a between teeth <NUM> on the torque ring <NUM>. The grooves between the teeth rotationally couple the fins, the upper section 32a, and the torque ring.

A further lifting force is applied by the crane shown as arrow "B" in <FIG> to overcome the spring force of the compression spring <NUM> in the clutch mechanism <NUM>. The spring force may be calibrated based on the load to accurately control the activation of the clutch.

The upper section 32a is moved upwards in the direction shown as arrow "U" in <FIG>, this brings the teeth 67b of the lower clutch member 66b in contact with the teeth 67a of the upper clutch member 66a where they mesh. The clutch mechanism is moved to a closed clutch condition and the upper section 32a and the lower section 32b of the lift connector apparatus are rotationally coupled.

During a lifting operation any rotational torque applied to the lifting hook about the longitudinal axis "L" as shown in <FIG> is transferred through the upper section 32a of the lift connector apparatus through the fins <NUM> to the teeth <NUM> of torque ring <NUM> and applied to the load. The teeth on the inside of the torque ring transfer the torque from the fins to torque ring and to the load via the slings. This allows even the smallest degree of rotation applied by the lifting device to be transfer to the load ensuring accurate positioning of the load. As the torque is substantially applied to the torque ring minimal torque may be transferred or applied to the indexer mechanism which avoids damage to the studs or accidental release of studs from the indexer mechanism.

Also during a lifting operation any rotational torque applied to the load about the longitudinal axis "L" as shown in <FIG> is transferred through load connector apparatus to the torque ring <NUM> and via the torque ring teeth <NUM> to the fins <NUM> of the upper section of the lift connector apparatus. This allows torque acting on the load to be accurately and effectively transferred to the lifting apparatus.

This enables the lift connector apparatus upper section 32a and fin members <NUM> to transfer torque to the load connector apparatus <NUM> safely, securely and accurately.

To disconnect the lift connector apparatus <NUM> and load connector apparatus <NUM> the load is lowered to contact the ground or a surface capable of supporting the load. As the downward force provided by the weight of the load is reduced the spring force of the compression spring <NUM> in the clutch mechanism <NUM> separates the lower clutch member 66b and the upper clutch member 66a to move the clutch to an open clutch condition as shown in <FIG>. The upper section 32a is free to rotate about shaft <NUM>. The upper section 32a and lower section 32b may rotate independently from one another.

The load force acting on the studs <NUM> in load bearing slot <NUM> from the weight of the load is also reduced and further upward movement in direction "B" of the lift connector apparatus <NUM> results in the studs <NUM> moving out of the load bearing slot <NUM>. The lower section 32b rotates relative to the upper section about longitudinal axis "L" as the studs <NUM> travel along the track 45a to the track outlet <NUM>. The lift connector apparatus <NUM> is disconnected from the load connector apparatus and may be lifted out of the bore <NUM>.

In some examples, the track mechanism is designed for the sequential lifting or longitudinal movements of a first vertical drop to guide the studs into the track and then a first vertical lift in an upward movement to engage the load bearing slot. However, it will be appreciated that other tracks shapes with different locking and unlocking drop/lift sequences may be used to latch the load connector apparatus and lift connector apparatus.

In alternative embodiments, interlocking teeth may be used which would allow the track to rotate freely to find the studs, while the fins are unable to rotate until the lifting point is found and the lifting connector apparatus is under tension. Then the teeth engage, and the connection becomes rigid allowing torque to be transferred through the lifting connector apparatus.

Although the described embodiments relate to the indexer mechanism being located on an outer surface of the lift connector apparatus and the corresponding studs being located on an inner bore surface of the load connector apparatus, it will be appreciated that the indexer mechanism may be located on an inner surface of the bore of the load connector apparatus and the corresponding studs may be located on an outer surface of the lift connector apparatus.

Referring to <FIG>, there is shown generally depicted at <NUM> an alternative load connecting apparatus designed to reversibly couple to the lift connector apparatus <NUM> described in <FIG> above.

The load connector apparatus <NUM> is similar to the load connecting apparatus <NUM> described in <FIG> and <FIG>, however, the load connector apparatus <NUM> does not have a cylindrical chamber <NUM> to support the studs and accommodate the lift connector apparatus <NUM>.

The load connector apparatus <NUM> has a frame <NUM>. The frame <NUM> has two vertical supports <NUM> connected to a base section <NUM> at a lower end 152a of the supports <NUM>. The frame design of the load connector apparatus <NUM> allows for a more compact storing profile when not in use, than the load connector apparatus <NUM>. The frame <NUM> may fold flat.

Studs <NUM> are connected to the vertical supports <NUM> by stud supports <NUM>. The studs <NUM> face one another and are dimensioned to accommodate the lift connector apparatus <NUM> between the studs <NUM> and allow the studs <NUM> to be located in the tracks <NUM> of the indexer mechanism <NUM> of the lift connector apparatus <NUM>. The load connector apparatus <NUM> is load bearing. The frame <NUM>, and vertical supports <NUM> must be strong enough to take the weight of the load and torque applied.

The upper ends 152b of the supports <NUM> have apertures <NUM> which are configured to receive rods <NUM> connected to torque ring <NUM> and allow the torque ring to pivot about the longitudinal axis of the rods <NUM> shown as "R" in <FIG>. The torque ring is not fixed onto the main structure. The torque ring may pivot between an operational position which is substantially perpendicular to the vertical supports and a storage position which is substantially parallel to the vertical supports.

As shown in <FIG> the aperture <NUM> has a generally key slot shape with an upper section 156a and a lower section 156b. The upper section 156a is wider than the lower section 156b. The rod <NUM> has a generally square cross section and when the rod <NUM> is located in the upper section 156a the rod is free to rotate about axis "R". However, when the rod <NUM> is located in the narrower lower section 156b of the aperture <NUM> the rod is unable to rotate and is locked in position.

The aperture shape allows the rod to rotate when the rod is located in the wider upper part of the aperture in an elevated position. The rod and connected torque ring are held in a rotationally fixed position when the rod is in a resting position and located in the lower section of the key shaped aperture. This allows the torque ring to rotate between a vertical position substantially parallel with the vertical supports <NUM> when in a storage condition and a rigid horizontal position substantially perpendicular with the vertical supports <NUM> when in use.

The torque ring <NUM> is similar to torque ring <NUM> described in <FIG>, <FIG> and will be understood from the description of <FIG>, <FIG>. The torque ring <NUM> has a plurality of teeth <NUM> on the inner surface of the ring designed to engage the lift connector apparatus <NUM>. In some examples, the ring has a diameter of <NUM> with teeth <NUM> having a rounded profile. However, it will be appreciated that a variety of teeth designs, a different number of teeth and ring diameters may be used.

As shown in <FIG>, weights <NUM> are attached by chains <NUM> to either ends 158a of the rods <NUM>. The weights <NUM> act as a balancing aid to bring the torque ring to an operational position which is substantially horizontal and is substantially perpendicular with the vertical supports <NUM>. Alternatively the torque ring <NUM> may be a weighted ring to allow gravity to act solely on the rods <NUM> to bring the torque ring <NUM> back to the operational position and lock it in the operational position by maintaining the rods in the lower part of the key-shaped aperture <NUM>.

In the above examples, the rods <NUM> are connected to the torque ring <NUM> and provide support to the torque ring <NUM>. However, it will be appreciated that a different number of rods or rods designs may be used to support the torque ring.

In alternative embodiments, the torque ring <NUM> may be supported by a single rod or pin which passes through an aperture on one vertical support to allow the torque ring to pivot and a stop member to prevent rotation beyond a certain point.

The vertical supports may alternatively have a recess which accommodates the weights <NUM>. The recess may provide a channel in which the weight moves up and down as the torque ring is rotated between a storage position where the plane of the torque ring is substantially vertical and is substantially parallel with the vertical supports and an operational position where the plane of the torque ring is substantially horizontal and is substantially perpendicular with the vertical supports.

The supports have eyelets <NUM> on the outer surface of the vertical supports <NUM> which allow for a shackle or sling connection to be attached to allow the load connector apparatus <NUM> to be connected to a load.

The base of load connector apparatus <NUM> consists of a central block section <NUM> and two semi-circular base supports <NUM> which act as balancing aids.

In some examples, the semi-circular base supports are attached to the central block section through a rack <NUM> and pinion <NUM> system which is connected to a plate <NUM>.

As shown in <FIG>, the load connector apparatus <NUM> is set on top of a load or ground (when not in use). The plate <NUM> pushes the racks up, thus rotating the pinions in the opposite direction, causing the balancing aids to lower. When the load connector apparatus <NUM> is picked up by the lifting device, the weight of the plate <NUM> pulls in the opposite direction from the lifting force, thus lowering the racks, allowing the pinions to rotate back up, this in turn moves the balancing aids to a substantially vertical position.

As an alternative to positioning the eyelets on the frame, a rigid master link could be located at the base to hold the eyelets.

As an alternative to the semi-spherical supports, legs <NUM> could extend from the bases as shown in <FIG> to help stabilise the load connector apparatus <NUM>.

Instead of having a rack and pinion to activate the stabilisers, a pressurized plate could be used to do so. A separate way of allowing the legs to fold up and release would be a simple hinge to which the legs pivot around and lower and lock when required.

In use, the load connector apparatus <NUM> is connected to a load to be moved via slings attached to lifting eyelets <NUM>. The lift connector apparatus <NUM> is connected to a crane by upper section 32a.

The crane operator maneuvers a lifting hook connected to the lift connector apparatus <NUM> such that the lower end <NUM> passes through the torque ring <NUM>. The torque ring creates a target for the crane operator to aim for with the lift connector apparatus.

As the lift connector apparatus <NUM> is lowered into torque ring <NUM> of the load connector apparatus <NUM>, the fins <NUM> engage the grooves 122a between the teeth <NUM> in the torque ring <NUM> which assists in guiding the lift connector apparatus <NUM> into the correct operational position and aids the indexer mechanism <NUM> on the lift connector apparatus <NUM> to approach the studs <NUM> on the stud support in the correct orientation. The teeth <NUM> keep the lift connector apparatus <NUM> in a substantial vertical orientation which assists the studs <NUM> to connect with the indexer mechanism <NUM>. Relative movement of the lift connector apparatus <NUM> relative to the load connector apparatus <NUM> determines which track in indexer mechanism the studs <NUM> enter.

Under the effects of gravity, the weight of the lift connector apparatus <NUM> moves the lift connector apparatus in a downward direction shown as arrow "A" in <FIG> until the studs <NUM> enter the track inlets <NUM> in the indexer mechanism <NUM>.

Under the weight of the lift connector apparatus <NUM>, the studs <NUM> travel along track 45a in the indexer mechanism <NUM> and contact inclined shoulder <NUM> in the track and the studs <NUM> are directed into upper slot <NUM>. This action rotates the lower section 32a of the lift connector apparatus <NUM> relative to the upper section 32b. As the clutch mechanism <NUM> is in the open clutch condition, the upper section 32a and lower section 32b are free to rotate independently of one another.

When the studs <NUM> are in the upper slot <NUM> of the indexer mechanism, the lift connector apparatus <NUM> cannot be lowered any further in direction "A". The crane operator moves the lift connector apparatus <NUM> in an upward direction shown as arrow "B" in <FIG>. This upward movement or jolt results in the stud <NUM> travelling along track <NUM> in the indexer mechanism <NUM> and contacting inclined shoulder <NUM> in the track which directs the studs <NUM> into load bearing slot <NUM>. When the studs <NUM> are located in the load bearing slots <NUM> they are constrained against rotation by shoulders <NUM> and <NUM> and the downward force "F" acting on the studs by the load. The lift connector apparatus <NUM> and load connector apparatus <NUM> are reversibly coupled together.

As the indexer mechanism <NUM> of the lower section of the lift connector apparatus is maneuvered to position the studs <NUM> in load bearing slot <NUM>, the fins <NUM> on the upper section are positioned in grooves 122a between teeth <NUM> on the torque ring <NUM>. The lower section 32b is able to rotate about the longitudinal axis relative to the upper section by bearing <NUM>.

When the studs <NUM> are positioned in load bearing slot <NUM> the fins <NUM> are securely positioned in grooves 122a between teeth <NUM> on the torque ring <NUM>. The grooves between the teeth rotationally couple the fins, the upper section 32a, and the torque ring.

A further lifting force is applied by the crane shown as arrow "B" in <FIG> to overcome the spring force of the compression spring <NUM> in the clutch mechanism <NUM>. The upper section 32a is moved upwards in the direction shown as arrow "U" in <FIG>. This brings the teeth 67b of the lower clutch member 66b in contact with the teeth 67a of the upper clutch member 66a where they mesh. The clutch mechanism is moved to a closed clutch condition and the upper section 32a and the lower section 32b of the lift connector apparatus are rotationally coupled.

During a lifting operation, any rotational torque applied to the lifting hook about the longitudinal axis "L" as shown in <FIG> is transferred through the upper section 32a of the lift connector apparatus through the fins <NUM> to the teeth <NUM> of torque ring <NUM> and applied to the load. The teeth on the inside of the torque ring transfer the torque from the fins to torque ring and to the load via the slings. This allows even the smallest degree of rotation applied by the lifting device to be transfer to the load ensuring accurate positioning of the load. As the torque is substantially applied to the torque ring minimal torque may be transferred or applied to the indexer mechanism which avoids damage to the studs or accidental release of studs from the indexer mechanism.

Also, during a lifting operation any rotational torque applied to the load about the longitudinal axis "L" as shown in <FIG> is transferred through load connector apparatus to the torque ring <NUM> and via the torque ring teeth <NUM> to the fins <NUM> of the upper section of the lift connector apparatus. This allows torque acting on the load to be accurately and effectively transferred to the lifting apparatus.

This enables the lift connector apparatus upper section 32a and fin members <NUM> to transfer torque to the load connector apparatus <NUM> safely, securely, and accurately.

To disconnect the lift connector apparatus <NUM> and load connector apparatus <NUM>, the load is lowered to contact the ground or a surface capable of supporting the load. As the downward force provided by the weight of the load is reduced, the spring force of the compression spring <NUM> in the clutch mechanism <NUM> separates the lower clutch member 66b and the upper clutch member 66a to move the clutch to an open clutch condition as shown in <FIG>. The upper section 32a is free to rotate about shaft <NUM>. The upper section 32a and lower section 32b may rotate independently from one another.

The load force acting on the studs <NUM> in load bearing slot <NUM> from the weight of the load is also reduced, and further upward movement in direction "B" of the lift connector apparatus <NUM> results in the studs <NUM> moving out of the load bearing slot <NUM>. The lower section 32b rotates relative to the upper section about longitudinal axis "L" as the studs <NUM> travel along the track 45a to the track outlet <NUM>. The lift connector apparatus <NUM> is disconnected from the load connector apparatus.

<FIG> shows a funnel <NUM> which may be incorporated into the design of the load connector apparatus or a housing integral or connected to the load connector apparatus. The funnel is configured to guide or direct the lift connector apparatus <NUM> into at least a portion of the load connector apparatus.

Although the described embodiments relate to the indexer mechanism being located on the lift connector apparatus and the corresponding studs located on the load connector apparatus, it will be appreciated that the indexer mechanism may be located on the load connector apparatus and the corresponding studs may be located on the lift connector apparatus.

Certain embodiments of the invention provide a system and method for lifting a load, which comprises a first connector member connectable to a load to be lifted and a second connector member comprising a first section and a second section. The first section is connectable to a lifting device and the second section is configured to reversibly couple to the first connector member.

Some embodiments of the present invention provide an improved system and method for connecting and disconnecting a lifting device to a load and controlling the lifting and handling of the load.

It allows the user to remotely connect, disconnect, lift, and accurately control the orientation of the load. The lifting device can be remotely and reliably attached to the load and torque or mechanical stresses during the orientation or handling of the load are minimised on the latching mechanism. Therefore, the load is reliably connected, and damage or accidental disconnection of the load is mitigated.

The apparatus and method may be safer than previous systems which require on-site workers manually connecting the load to the lifting device and controlling its orientation by guide ropes or working in close proximity to the suspended load. By providing a system that enables remote connection and disconnection of a load and minimises stresses and strains on the connection, The apparatus and method mitigates potential damage and/or personnel injuries.

Throughout the specification, unless the context demands otherwise, the terms 'comprise' or 'include', or variations such as 'comprises' or 'comprising', 'includes' or 'including' will be understood to imply the inclusion of a stated integer or group of integers, but not theexclusion of any other integer or group of integers.

Furthermore, relative terms such as, "lower" ,"upper, "up", "down", "above", "below" and the like are used herein to indicate directions and locations as they apply to the appended drawings and will not be construed as limiting the invention and features thereof to particular arrangements or orientations. Likewise, the term "outlet" shall be construed as being an opening which, dependent on the direction of the movement of a fluid and may also serve as an "inlet", and vice versa.

Claim 1:
A system for connecting a lifting device to a load to be lifted; the system comprising:
a first connector member (<NUM>), the first connector member comprising at least one pin (<NUM>); and
a second connector member (<NUM>), the second connector member comprising an indexer mechanism (<NUM>) defining a track (<NUM>), the track comprising at least one track opening (<NUM>);
wherein the first connector member (<NUM>) has a cylindrical body (<NUM>) which forms a chamber (<NUM>) to receive at least a portion of the second connector member (<NUM>);
wherein at least a portion of the at least one pin (<NUM>) is receivable in and moveable out of the track (<NUM>) via the at least one track opening (<NUM>);
wherein the pin (<NUM>) is movable along the track between a lock position and an unlock position;
wherein the first connector member (<NUM>) and the second connector member (<NUM>) are decoupleable in the unlock position,
characterized in that, the first connector member (<NUM>) is reversibly coupleable to the second connector member (<NUM>) via the pin (<NUM>) and the indexer mechanism (<NUM>) in response to a first series of longitudinal movements of the first or second connector members.