APPARATUS FOR CHARGING ROBOTIC LOAD HANDLING DEVICES - Patent application

Abstract

A charging station (237) for a robotic load handling device operable on a grid structure comprising a plurality of grid members arranged in a grid pattern comprising a plurality of grid spaces or grid cells is provided. The charging station (237) comprises a support structure comprising a base (150) and at least one carriage (135). The charging station further comprises at least one charging head assembly (152) for coupling with a charge receiving head of the robotic load handling device, the at least one charging head assembly (152) extending outwardly from the base (150) and resiliently mounted to the at least one carriage (135) such that the at least one charging head assembly (152) is vertically movable relative to the at least one carriage (135). The at least one carriage (135) is rotatably mounted to the base (150) about a vertical axis extending through the base such that the at least one charging head assembly (152) is rotatable about the vertical axis from a first position to a second position.

Description

[Technical field]

[0001] The present invention relates generally to the field of robotic load handling devices, and more particularly to an apparatus and method for charging robotic load handling devices. [Background technology]

[0002] Storage systems are well known that comprise a three-dimensional storage grid structure for storing containers / bins and stacked on top of each other. PCT Publication WO 2015 / 185628A (Ocado) describes a known storage and fulfilment system in which a stack of bins or containers is arranged within a grid framework structure. The bins or containers are accessed by a load handling device operable on a truck positioned on top of the grid framework structure. This type of storage system 1 is shown diagrammatically in Figures 1 to 3 of the accompanying drawings.

[0003] As shown in Figures 1 and 2, stackable containers known as bins 10 are stacked on top of each other to form a stack 12. The stack 12 is arranged within a grid framework structure 14 within a warehouse or manufacturing environment. The grid framework structure 14 is made up of a number of storage or grid columns. Each grid within the grid framework structure 14 has at least one grid column for storage of a stack of containers. Figure 1 is a schematic perspective view of the grid framework structure 14, and Figure 2 is a top-down view showing a stack 12 of bins 10 arranged within the grid framework structure 14. Each bin 10 typically holds multiple manufactured items (not shown), which may be the same or may be of different product types depending on the application.

[0004] The grid framework structure 14 comprises a plurality of upright members 16 supporting horizontal members 18, 20. A first set of parallel horizontal members 18 are arranged perpendicular to a second set of parallel horizontal members 20 to form a plurality of horizontal grid structures supported by the upright members 16. The members 16, 18, 20 are typically fabricated from metal. The large containers 10 are stacked between the members 16, 18, 20 of the grid framework structure 14 such that the grid framework structure 14 restrains horizontal movement of the stack 12 of large containers 10 and guides vertical movement of the large containers 10. The upper level of the grid framework structure 14 includes rails 22 arranged in a grid pattern across the top of the stack 12. With further reference to FIG. 3, the rails 22 support a plurality of load handling devices 30. A first set 22a of parallel rails 22 guides movement of the robotic load handling device 30 in a first direction (e.g., the X direction) across the top of the grid framework structure 14, and a second set 22b of parallel rails 22, disposed perpendicular to the first set 22a, guides movement of the load handling device 30 in a second direction (e.g., the Y direction) perpendicular to the first direction. In this manner, the rails 22 allow the robotic load handling device 30 to move laterally in two dimensions in the horizontal XY plane so that it can be moved into position above any of the stacks 12.

[0005] A known load handling device 30, shown in Figures 4 and 5, comprises a vehicle body 32 as described in PCT Patent Publication WO 2015 / 019055 (Ocado), incorporated herein by reference, where each load handling device 30 covers only one grid space of the grid framework structure 14. Here, the load handling device 30 comprises a wheel assembly comprising a first set of wheels 34 consisting of a pair of wheels at the front of the vehicle body 32 and a pair of wheels 34 at the rear of the vehicle 32 for engaging with a first set of rails or tracks to guide the movement of the device in a first direction, and a second set of wheels 36 consisting of a pair of wheels 36 on each side of the vehicle 32 for engaging with a second set of rails or tracks to guide the movement of the device in a second direction. Each of the sets of wheels is driven to enable the vehicle to move in the X and Y directions respectively along the rails. One or both sets of wheels can be moved vertically to lift each set of wheels off its respective rail, thereby allowing the vehicle to move in a desired direction on the grid.

[0006] The load handling device 30 is equipped with a lifting device or crane mechanism for lifting the storage container from the top. The crane mechanism comprises a winch tether or cable 38 wound on a spool or reel (not shown) and a gripping device 39. The lifting device comprises a set of vertically extending lifting tethers 38 near or connected to four corners of a lifting frame 39, otherwise known as a gripping device (one tether near each of the four corners of the gripping device) for releasable connection of the storage container 10. The gripping device 39 is configured to releasably grip the top of the storage container 10 for lifting it from a stack of containers in a storage system of the type shown in Figures 1 and 2.

[0007] The wheels 34, 36 are positioned around the periphery of a cavity or recess known as a container receiving recess 40 in the lower portion. The recess is sized to accommodate the container 10 as it is lifted by the crane mechanism as shown in Figures 5(a and b). When the container is in the recess, it is lifted off the lower rail to allow the vehicle to move laterally to a different location. Upon reaching the target location, for example an access point in another stack, storage system or conveyor belt, the bin or container can be lowered from the container receiving portion and released from the gripping device.

[0008] Although not shown in FIGS. 1-3, the load handling device 30 is powered during operation by an on-board rechargeable battery. Examples of rechargeable batteries are lithium ion batteries, nickel cadmium batteries, nickel metal hydride batteries, lithium ion polymer batteries, thin film batteries, and smart battery carbon foam-based lead acid batteries. The battery is recharged by a charging station 50 shown in FIG. 6 while the handling device 30 is operable on the grid framework structure 14. The charging station 50 is typically an L-shaped structure fixed in close proximity to the grid framework structure 14 and extends over the nominal grid cells at the edge of the grid structure. The charging station includes a charging head assembly 52 with charging contacts fixed in place relative to the L-shaped structure. The charging head assembly is mounted on one arm 54 of the L-shaped structure such that the charging head assembly 52 is suspended over at least two grid spaces of the grid framework structure. The load handling device can be charged by commanding the charging head assembly to move to a grid cell positioned above it. As the load handling device moves into a grid cell, contact is made between charging contact pads on the top surface of the load handling device and charging contacts of the charging head assembly 52. ​​Charge is applied to the load handling device from the charging contacts through the charging contact pads located on the top surface of the load handling device.

[0009] However, there are some problems with charging stations. In particular, as the robotic load handling device moves into the charging station, a clamping force exists between the charging contacts and the robotic load handling device. The magnitude of this force can create problems over a period of time. For example, repeated entry of a subsequent robotic load handling device into a grid cell over which the charging station is positioned can cause fatigue of the charging station, subsequently necessitating maintenance or replacement of the charging head assembly and support structure. Additionally, vibrations of the grid framework structure caused by movement of the robotic load handling device can adversely affect alignment between the charging contacts of the charging station and the robotic load handling device. Additionally, damage, wear, and material creep of the grid cells can cause alignment issues between the charging contacts and the charging pad contacts, thereby adversely affecting the ability of the robotic load handling device to contact the charging contacts. Similarly, tolerances in the manufacture of both the grid framework structure and the charging station, and / or slight variations in the installation alignment of the grid framework structure relative to the charging station, and / or thermal expansion of the grid framework structure relative to the charging station can also cause alignment issues that adversely affect the ability of the robotic load handling device to contact the charging contacts. Furthermore, the charging contacts wear over time and therefore require periodic service work or repair. However, maintenance of the charging contacts requires human intervention on top of the grid framework structure, which can only be performed when the robotic load handling devices on top of the grid framework structure are in a "safe mode" where they are inoperable. The downtime resulting from the load handling devices being idle leads to an overall production loss for the system.

[0010] PCT / EP2019 / 061808 (Ocado Innovation Limited) addresses this problem by providing a charging station in which a charging head assembly 52 is attracted to a charging pad on the top surface of a load handling device. The charging head comprises a charging unit 56 (see Figs. 7a and 7b) with a number of contoured sections 58, 60 arranged to interface with a lifting element 70 of a handling device 30 (see Fig. 8) and a power transfer component 62 arranged to transfer power to the load handling device when the lifting element 70 engages with the number of contoured sections 58, 60. Fig. 8 shows a lifting element 70 used for manual movement of the load handling device 30. The lifting element 70 comprises a cutout below the bulbous head that rises to a lower surface 72. The lifting element 70 is designed to allow attachment of a lifting apparatus to lift the load handling device 30 from the grid cell. The power transfer component 62 is typically constructed of copper and is biased outwardly by a resilient member, e.g., a spring, to cushion the impact of the power transfer unit 62 contacting the charging pad 74 on the upper surface 76 of the load handling device 30. In addition to the power transfer unit 62, the charging unit 56 includes a plurality of charging contacts 63 on its lower surface. Similar to the power transfer unit 62, the plurality of charging contacts 63 are biased outwardly by a resilient member, e.g., a spring, to cushion the impact of the charging contacts 63 contacting the charging pad 74 on the upper surface 76 of the load handling device 30. In contrast to the power transfer unit 62, the additional charging contacts may be for prevention of arcing between the power transfer units or for data transmission during charging.

[0011] The plurality of contoured sections 58, 60 and the power transfer unit 62 are disposed within a movable charging unit 56. The contoured sections 58, 60 include upwardly sloping surfaces such that contact between the lifting element 70 and the plurality of contoured sections 58, 60 causes movement of the charging unit 56 towards the load handling device, thereby controlling the amount of clamping force between the charging unit 56, particularly the charge transfer unit 62, and a charging pad 74 on the top surface of the robotic load handling device. By having both a resiliently biased power transfer unit 62 and / or a plurality of resiliently biased charging contacts 63, damage / wear to the cartridge and / or top surface of the robotic load handling device is minimized.

[0012] Contact occurs between the lifting element 70 and the contoured sections 58, 60 as the load handling device moves over the grid cells below the charging head assembly such that the lifting element is driven into and received by the contoured sections 58, 60. Although various spring mechanisms are used to absorb the shock of the lifting element interacting with the contoured sections 58, 60, the majority of the shock, which is primarily horizontal, is absorbed by the L-shaped structure supporting the charging unit on the grid cell. As a result, the L-shaped structure, and in particular its attachment to the grid framework structure, weakens over time. In extreme cases, the impact of the lifting element with the contoured sections 58, 60 can distort or pull components of the L-shaped structure away from the grid framework structure over time, compromising the ability of the charging head assembly of the charging unit attached to the L-shaped structure to properly align with the charge receiving head of the load handling device. Other considerations by which misalignment of the load handling device and the charging station can adversely affect the proper operation of the load handling device include the risk of arcing between the power transfer components of the charging station and the charging contacts of the load handling device. In addition, repeated contact between the lifting elements from a subsequent robotic load handling device charging at the charging station and the contoured sections 58, 60 will eventually wear down the contoured sections over time, impairing the ability of the charging unit 56 to be attracted to a charging pad on the top surface of the load handling device.

[0013] In WO 2019 / 238702 (Autostore Technology AS), a charge receiving element for charging a battery is attached to the underside of a container vehicle or a load handling device and is arranged to electrically couple with a charge providing element of a charging station located in a single grid cell at a height below the rails on a grid framework structure. In operation, the container vehicle or the load handling device is moved to a position above the charging station so that the charge receiving element on the underside of the container vehicle is directly above the charge providing element of the charging station in the grid cell, more specifically, so that their corresponding contact surfaces face each other. Electrical contact or coupling is achieved by lowering the container vehicle vertically towards the rail grid, for example by vertically displacing a set of wheels of the container vehicle, so that the corresponding contact surfaces of the charge receiving element and the charge providing element mate. By lowering the container vehicle towards the rail grid, the contact surface of the charge receiving element is pushed to mate with the contact surface of the charge providing element of the charging station. The charge receiving element or the charge providing element may be connected to a resilient assembly to bias the charge receiving element or the charge providing element vertically. The integration of the charging station within a single grid cell of the grid framework structure at a height below the rails of the rail grid allows the charging station to be located anywhere on the rail grid without impeding the movement of the container vehicle. WO 2019 / 238702 (Autostore Technology AS) is very limited to container vehicles equipped with a crane device with a cantilever arm extending laterally from the top of the vehicle to accommodate the container receiving space, i.e. the container is accommodated under the cantilever arm and held above the rail height. Similarly, the vehicle needs to be heavy enough to counterbalance the weight of the container and remain stable during the lifting process. As a result, a container vehicle including a container receiving space has a footprint that extends over at least two grid cells.

[0014] Therefore, there is a need for a charging unit that does not suffer from the problems discussed above. Summary of the Invention

[0015] The present invention alleviates the problem of having to pull up or hoist the charging head assembly to gain access to it for servicing by providing a charging station for a robotic load handling device that is operable on a grid structure comprising a plurality of grid members arranged in a grid pattern comprising a plurality of grid spaces or grid cells, the charging station comprising: i) a support structure comprising a base and at least one carriage; ii) at least one charging head assembly for mating with a charging receiving head of the robotic load handling device, the at least one charging head assembly extending outwardly from the base and resiliently mounted to the at least one carriage such that the at least one charging head assembly is vertically movable relative to the at least one carriage; Equipped with The at least one carriage is rotatably mounted to the base about a vertical axis extending through the base such that the at least one charging head assembly is rotatable about the vertical axis from a first position to a second position.

[0016] By rotatably mounting the carriage carrying the at least one charging head assembly about a substantially vertical axis extending through the base, the at least one charging head assembly may be rotated about the vertical axis from an operational position overhanging the at least one grid cell to a service position away from the grid structure. By having a carriage for mounting the charging head assembly that is rotatable about a vertical axis extending through the base supporting the carriage, the charging station is simplified by eliminating the need to have a complex winch mechanism for moving the at least one charging head assembly. Rotatably mounting the carriage to the base not only eliminates the need for a complex winch assembly, but also significantly reduces the time to service the at least one charging head assembly, since the carriage carrying the at least one charging head assembly only needs to be rotated to gain access to the at least one charging head assembly.

[0017] Optionally, the at least one carriage comprises a first carriage and a second carriage, and the at least one charging head assembly comprises a first set of charging head assemblies and a second set of charging head assemblies, the first set of charging head assemblies being resiliently mounted to the first carriage and the second set of charging head assemblies being resiliently mounted to the second carriage, and the first and second carriages configured to rotate about a vertical axis to move the first set of charging head assemblies to a first position and the second set of charging head assemblies to a second position. A plurality of carriages may be rotatably mounted to the base to support the first and second sets of charging head assemblies. The first and second sets of charging head assemblies may advantageously provide an operational set of charging head assemblies and a spare set of charging head assemblies to further reduce downtime when the charging station is being serviced. For example, the first set of charging head assemblies is operational and capable of charging the robotic load handling device while the second set of charging head assemblies is being serviced. Thus, by rotating the first set of charging head assemblies to a first position (operable position), the second set of charging assemblies is moved to a second position (service position), and vice versa. Preferably, the first and second sets of charging head assemblies are rotationally symmetrically arranged about a vertical axis. Optionally, the first position is diametrically opposite the second position.

[0018] Preferably, at least one charging head assembly comprises a charging unit for cooperating with a charge receiving head of a robotic load handling device, said charging unit comprising: i) a plurality of contoured sections; ii) a cartridge for interfacing with a lifting element of a robotic load handling device, the cartridge being movable along a plurality of contoured sections to effect vertical movement of the at least one charging head assembly relative to a charging receiving head of the robotic load handling device; Equipped with.

[0019] Preferably, the at least one carriage is rotatably mounted to the base by a rotary mechanism. Preferably, the rotary mechanism comprises bearings and / or bush bearings. Optionally, the rotary mechanism is motorized.

[0020] Preferably, the charging station further comprises a locking mechanism for locking the at least one carriage in a first position (which is an operational position for charging the robotic load handling device) and / or a second position (which is a service position for servicing the at least one charging head assembly). The locking mechanism allows for locking the carriage in the first position while the at least one charging head assembly is being serviced in the second position and also prevents movement of the carriage when the robotic load handling device is being charged.

[0021] More preferably, the at least one carriage is a swing arm that is rotatable about a vertical axis extending through the base.

[0022] The present invention relates to a grid structure comprising a first set of tracks and a second set of tracks extending transversely to the first set in a substantially horizontal plane, the grid structure being arranged in a grid pattern comprising a plurality of grid spaces or grid cells; a charging station according to the present invention mounted to the grid structure such that at least one charging head assembly of the charging station overhangs a grid cell when the charging station is in a first position; A storage system is provided.

[0023] Attaching the charging station, and more specifically the base of the charging station, directly to the grid structure rather than to a separate framework adjacent to the grid structure helps accommodate tolerances in the grid framework structure due to manufacturing / installation and / or thermal expansion that would otherwise cause alignment issues. Reducing alignment issues results in a more stable charging station that can better withstand any seismic activity. Additionally, attaching the charging station directly to the grid structure is more cost effective than attaching to a separate framework adjacent to the grid structure because less material is required and it is less labor intensive to fit the charging station to the grid structure.

[0024] Preferably, the base of the charging station is attached to at least one grid cell. Preferably, the base of the charging station is clamped to at least one grid member. Thus, it is possible for the base of the charging station to be attached onto a single grid cell or across multiple grid cells (e.g., two or three grid cells) and one or more grid members. Thus, there are various ways in which the base of the charging station may be attached onto a grid framework structure.

[0025] Preferably, the charging station is clamped to at least one grid member by at least one grid clamp, said at least one grid clamp being configured to clamp opposing surfaces of one or more grid members. The grid clamp may be contoured to correspond to a contour of the grid member. For example, the grid member may comprise a track and a channel, and the grid clamp may be contoured to fit around the at least one track and the at least one channel. This helps to better secure the charging station base to the grid. The grid clamp may comprise an elevated platform to which the charging station base may be attached. The grid clamp may also comprise at least two clamp brackets that hook around and under the grid member. The clamp brackets may be slidably movable along a length of the grid clamp to help manipulate and position the grid clamp on the grid structure. In particular, the clamp brackets may be slidably movable along at least one beam that supports the elevated platform. The at least one beam is clamped to the grid member by the grid clamp.

[0026] Preferably, the charging station is mounted to an edge of a grid structure whereby the carriage is rotatable about a vertical axis to move the at least one charging head assembly toward the grid structure to a first position such that the at least one charging head assembly protrudes over a grid cell, and away from the grid structure to a second position such that the at least one charging head assembly is accessible from the edge of the grid structure.

[0027] Preferably, the grid structure is supported by a plurality of upright columns to define a grid framework structure, the plurality of upright columns being arranged to form a plurality of vertical storage locations for one or more containers to be stacked between and vertically guided by the upright columns; The plurality of upright columns are interconnected at their upper ends by a plurality of grid members.

[0028] Preferably, the storage system further comprises a load handling device, the load handling device comprising: i) a drive mechanism operatively arranged to move a load handling device on the grid structure to traverse along a first set and a second set of tracks on a plurality of grid spaces or grid cells; ii) a lifting device comprising a lifting drive assembly and a gripping device configured, in use, to releasably grip a container and lift the container from the stack into the container receiving space when the load handling device is positioned above a stack of containers occupying a grid space or grid cell; iii) a charge receiving head for mating with at least one charge head assembly; Equipped with.

[0029] More preferably, at least one charge head assembly comprises a charge presentation head arranged to mate with the charge reception head, e.g., the charge presentation head comprises at least two charge presentation pads arranged to electrically contact at least two charge reception pads of the charge reception head of the robotic load handling device.

[0030] Additional features and aspects of the present invention will become apparent from the following detailed description of illustrative embodiments which proceeds with reference to the drawings. [Brief description of the drawings]

[0031] [Figure 1] 1 is a schematic diagram of a grid framework structure according to known systems; [Diagram 2] FIG. 2 is a top-down schematic diagram showing a stack of large vessels arranged within the framework structure of FIG. 1. [Diagram 3]FIG. 1 is a system schematic illustrating a known robotic load handling device operating on a grid framework structure. [Figure 4] 1 is a schematic diagram of a load handling device according to a known system; [Figure 5(a)] 5 is a schematic cutaway perspective view of the load handling device of FIG. 4 showing a container accommodated within a container receiving space of the load handling device. [Figure 5(b)] 5 is a schematic cutaway perspective view of the load handling device of FIG. 4 showing a container receiving space of the load handling device; [Figure 6] 1 is a schematic diagram illustrating a known charging station comprising a charging unit suspended from a support structure; [Figure 7a] 1 is a schematic diagram of a known charging unit from above, showing multiple contoured sections; [Figure 7b] 1 is a schematic view from below of a known charging unit showing a power transfer unit; [Figure 8] 1 is a schematic diagram of a top view of a known load handling device; [Figure 9a] 1A-1C are schematic diagrams of a charging unit in one orientation according to an embodiment of the present invention. [Figure 9b] 1A-1D are schematic diagrams of a charging unit in different orientations according to an embodiment of the present invention. [Figure 10a] 1 is a schematic diagram of a cartridge for interfacing with a lifting element of a robotic load handling device according to the present invention in one orientation; [Figure 10b] 1A-1D are schematic diagrams of a cartridge for interfacing with a lifting element of a robotic load handling device according to the present invention in different orientations. [Figure 11] FIG. 2 is a rear perspective view of a cartridge according to an embodiment of the present invention. [Figure 12] FIG. 2 is a side perspective view of a profiled section according to an embodiment of the present invention. [Figure 13] FIG. 2 is a perspective view of a charging head assembly with a charging unit contained therein. [Figure 14]1 is an exploded view of a charging head assembly including a housing and a charging unit contained therein. [Figure 15] 1 is a perspective view of a charging station showing a swing arm supporting a charging head assembly oriented in an operational position in accordance with an embodiment of the present invention; [Figure 16] FIG. 2 is a perspective view of the charging station showing the swing arm in a service position. [Figure 17] 2 is an exploded view of a housing containing a charging head assembly resiliently mounted to a support framework according to an embodiment of the present invention; FIG. [Figure 18] FIG. 2 is a perspective view of a charging station according to another embodiment of the present invention. [Figure 19] FIG. 2 is a perspective view of a grid clamp for clamping a charging station to a grid framework structure. [Figure 20] FIG. 13 is a perspective view of how a grid clamp may be fitted onto a grid framework structure. [Figure 21] FIG. 2 is a side view of a grid clamp fitted onto a grid framework structure. [Figure 22] FIG. 2 is a perspective view of a grid clamp fitted onto a grid framework structure.

[0032] FIG. 9a shows a charging unit 156 according to an embodiment of the invention seen from above. The charging unit 156 comprises a support plate 157 to which a power transmission means 162 and at least two contoured sections 158 are attached. The power transmission means 162 is connected to a suitable power source charger, preferably a DC power source charger. For example, the power source charger comprises a rectifier to convert from AC current to DC current. The power transmission means 162 comprises a charge providing head in the form of at least two charge providing pads 162b, one of the at least two charge providing pads providing DC- and another of the at least two charge providing pads providing DC+. The at least two charge providing pads 162b are arranged to interface with or clamp to two corresponding charge receiving pads 74 on the robotic load handling device 30 (see FIG. 8).

[0033] The charging unit 156 is typically centrally located above at least one grid cell for mating with a lifting element 70 of the robotic load handling device 30. As previously described above with reference to FIG. 8, the upper surface of the robotic load handling device includes the lifting element 70 and at least two charge receiving pads 74 for transferring power to a rechargeable power source within the robotic load handling device. The lifting element 70 includes a cutout below the bulbous head that rises to the lower surface 72. When transferring power to the robotic load handling device to charge the rechargeable power source, the robotic load handling device is commanded to enter the grid cell in which the charging unit 156 is located.

[0034] Conventionally, when the robotic load handling device enters a grid cell, the lifting element 70 of the robotic load handling device physically interacts or engages with the contoured sections 58, 60 of the charging unit in the sense that a cut-out portion of the lifting element is received between the contoured sections of the charging unit (see FIGS. 7a and 7b). To allow the lifting element 70 to be correctly received by the multiple contoured sections 58, 60, it is important that the charging unit is correctly positioned on the grid cell when the robotic load handling device attempts to dock at the charging station. If the charging unit is not correctly positioned on the grid cell, there is a risk that other parts of the charging unit may hit the lifting element or that the lifting element itself is not correctly positioned to engage or interact with the multiple contoured sections 58, 60. To mitigate the possibility of the charging unit hitting the lifting element and / or being incorrectly positioned to receive the lifting element, the mouths or inlets of the multiple sections have widened or tapered openings to allow the lifting element to be properly guided between the contoured sections. As shown in FIG. 7(a and b), the multiple contoured sections 58, 60 comprise a first contoured section and a second contoured section spaced apart sufficiently to receive the width of the lifting element 70 of the robotic load handling device. The side contours of the first and second contoured sections are shaped such that the inlets or inlets of the contoured sections are tapered to allow the lifting element to be guided between the first and second contoured sections and thus properly engage the upwardly sloping surfaces of the contoured sections.

[0035] The upwardly sloping surfaces of the plurality of contoured sections 58, 60 move or pull the charging unit, which includes at least two charge presentation pads, toward the upper surface of the load handling device in a clamping action and into physical contact with the at least two charge reception pads 74 on the upper surface of the load handling device. The at least two charge presentation pads are biased outwardly by resilient members to cushion the impact with the at least two charge reception pads on the upper surface of the load handling device. Movement of the charging unit toward the robotic load handling device creates a clamping action between the at least two presentation pads and the at least two charge reception pads on the upper surface of the robotic load handling device.

[0036] The speed at which the robotic load handling device enters the charging unit determines the strength of the clamping force by relying on an interaction between at least one of the plurality of contoured sections and the lifting element. The charging unit contained within the charging head assembly is resiliently mounted to the carriage to allow vertical movement of the charging unit relative to the carriage. Further details of the mounting of the charging unit to the carriage are discussed below.

[0037] The contoured sections primarily comprise a plastic material, more particularly a nylon material, due to its lubricating and wear properties. However, repeated physical contact between the lifting element and the contoured sections causes wear and breakage of the contoured sections, especially their upwardly sloping surfaces. In some cases, the contoured sections, which are preferably removably attached to the support plate, need to be replaced more frequently.

[0038] More importantly, when the robotic load handling device docks with the charging station, the lifting element impacts the charging unit with such a lateral force as it attempts to move vertically along the upwardly sloping surface of the contoured section. This impact force is transmitted to other parts of the charging station, particularly the attachment points that support the charging unit to the support structure (see FIG. 6). Repeated impacts of the lifting element with the charging unit not only cause wear to the contoured section, but eventually displace the charging unit on the grid cell to such an extent that the lifting element is no longer able to interact with or properly engage the charging unit. Additionally, the impact force can cause damage to the charging unit and its surrounding support structure, particularly the attachment points to the grid structure.

[0039] In contrast to the charging units of the prior art, the applicant has mitigated the above problems by devising a charging unit 156 as shown in Fig. 9(a and b) in which the lifting element 70 does not directly interact with the contoured sections 158, but rather interacts or engages with a movable cartridge 159. As shown in Fig. 9a, the cartridge 159 is configured to move along the multiple contoured sections 158 when the lifting element 70 is driven into the charging unit 156 of the present invention. This removes the need for the lifting element 70 to physically contact the multiple contoured sections 158 and improves the movement of the lifting element 70 along the multiple contoured sections 158. The first and second contoured sections 158(a and b) are shown in a parallel arrangement and spaced apart to accommodate the width of the lifting element 70 and allow the lifting element 70 to move along the multiple contoured sections. In other words, the cartridge 159 of the present invention is seated so as to be movably disposed along at least the first and second contoured sections 158(a and b).

[0040] In a particular embodiment of the invention shown in Figures 10(a and b), the cartridge 159 comprises a cutout or recess or C-section 170 shaped to receive and grip the underside 72 of the bulbous head of the lifting element 70. The cutout shaped to grip the underside 72 of the lifting element 70 replaces the wedge-shaped mouth at the inlet of the multiple sections as shown in the prior art setup of Figures 7(a and b). The charging unit 156 comprises a guide 172 adjacent to at least one of the multiple contoured sections 158(a and b) configured to guide the cartridge 159 along the contoured sections 158(a and b) in a sliding arrangement. In a particular embodiment of the invention, the guide 172 is formed as a groove adjacent the respective contoured section 158(a and b). The cartridge 159 includes at least one protrusion or boss 174 extending from at least one wall of the cartridge 159 that is receivable within a groove 172 (see FIG. 12) for guiding the cartridge 159 along the contoured sections 158(a and b). The groove is formed in an upstanding lip 176 adjacent at least one of the plurality of contoured sections 158(a and b). In a particular embodiment of the invention shown in FIGS. 9 and 10, the groove 172 is positioned on either side of the cartridge for receiving a protrusion or boss 174 formed on an opposing side or lateral side of the cartridge 159 for guiding the cartridge along the plurality of contoured sections 158. In other words, the protrusion 174 or one or more protruding regions of the cartridge are receivable within the guide 172 in a tongue-and-groove relationship.

[0041] Guide 172 includes a stop 178 at its distal end to limit the length of cartridge travel along the contoured section (see FIG. 12). In a particular embodiment of the invention, the groove terminates at its end so that a boss or protrusion 174 extending from a side wall of cartridge 159 abuts the end of guide 172, thereby limiting the length of cartridge travel along contoured section 158. Stop 178 prevents cartridge 159 from dislodging from contoured section 158 (a and b).

[0042] The contoured sections 158(a and b) are provided with an upwardly inclined surface or are wedge-shaped, so that the cartridge 159 of the present invention moves vertically as it moves along the upwardly inclined surface. This allows the charging unit 156 to be attracted to the charge-receiving head on the robotic load handling device. The charging unit 156 of the present invention still benefits from the clamping force generated by the interaction of the cartridge 159 with the contoured sections 158(a and b) by the lifting element 70, but without excessive wear on the contoured sections 158(a and b). Thus, by modifying the contour of the contoured sections 158(a and b), the clamping force acting on the robotic load handling device, and in particular the charge-receiving pad 74, may be customized according to the needs of a specific application. The grooves 172 adjacent to the contoured sections 158(a and b) help guide the cartridge 159 along the upwardly inclined surface. Together with the grooves for guiding the cartridge along the upwardly sloping surface, the multiple contoured sections control both horizontal and vertical movement of the cartridge 159 relative to the top surface of the robotic load handling device. The guide 172 may be formed as a single element together with at least one of the multiple contoured sections. FIG. 12 is an example of a single element comprising at least one of the multiple contoured sections 158a together with the guide 172 according to an embodiment of the invention. In a specific embodiment of the invention, a single element is positioned on either side of the cartridge to guide the cartridge along the contoured section. Each of the multiple contoured sections is wedge shaped to provide an upwardly sloping surface that cooperates with the cartridge 159. The guide 172 is shown as a groove formed in an upstanding lip 176 adjacent to the contoured section 158a.

[0043] In addition to the at least two charge delivery pads 162b, additional contact pads 163 may be disposed on the underside of the charging unit 156. The additional contact pads 163 may be for arcing prevention or data transmission during charging. In the particular embodiment shown in FIG. 9, four additional electrical contact pads 163 are shown on the underside of the charging unit 156, but any number of electrical contact pads may be present. Alternatively, the power transmission means 162 may comprise an inductive power transmission means that does not require physical contact between the power transmission means and the robotic load handling device. Thus, the need to provide a clamping force between the power transmission means 162, the at least two charge delivery pads 162b, and the charge receiving pad 74 on the upper surface of the robotic load handling device is eliminated, thereby mitigating any wear on the contoured section, particularly due to the cartridge. Instead, the contoured section brings the charge delivery pad closer to the charge receiving head to allow for conductive coupling.

[0044] The cartridge 159 for gripping the underside of the lifting element 70 forms a sliding bearing cooperating with a number of profiled sections (a and b). To function as a sliding bearing, the cartridge 159 comprises one or more sliding surfaces 181 (a and b), 180 arranged to cooperate with the upwardly inclined surfaces of the profiled sections (see Figures 10 and 11). A first sliding surface 181 (a and b) is provided on the underside of the cartridge 159 (see Figure 11), a second sliding surface 180 is provided on the opposing side walls of the cartridge 159 on both sides (see Figure 10). The first sliding surface 181 on the underside of the cartridge realizes a sliding surface in a horizontal plane and is subdivided into two parallel sliding surfaces 181 (a and b) separated by a division 179. The two parallel sliding surfaces 181(a and b) are arranged to slide along the first and second contoured sections 158(a and b). The split 179, shown as a wedge-shaped protrusion, is sized to seat between the first and second contoured sections 158(a and b) as the two parallel sliding surfaces 181(a and b) on the underside of the cartridge 159 are arranged to slide along the surfaces of the first and second contoured sections 158(a and b). The wedge-shaped protrusion of the split 179 accommodates the C-section 170 of the cartridge for gripping the lifting element 70 (see FIG. 10a).

[0045] The second sliding surfaces 180 are on opposing side walls of the cartridge 159 (see FIG. 10) and provide a sliding surface in a vertical plane. The second sliding surfaces 180 are shown as sliding ridges having a height less than the projections or bosses 174 received in the grooves to guide the cartridge 159 along the upwardly inclined surface. The second sliding surfaces 180 with the sliding ridges are arranged to slide against the side walls of the upstanding lips 176 adjacent to the respective contoured sections 158(a and b) (see FIG. 12). One of the functions of the second sliding "ridges" 180 is to prevent the distal ends or end faces of the projections or bosses 174 from rubbing against the inner walls of the grooves 172. The cartridge 159 of the present invention may be formed as a unitary body, for example, by molding or 3D printing. The grooves 172 may be formed by milling a recess in the body of the cartridge 159. However, a problem with milling is that the surface of groove 172 may not be completely smooth as a result of the impact of the cutting tool. Thus, the inner surface of groove 172 may not provide a smooth sliding surface and may introduce one or more impediments as cartridge 159 is driven along the upwardly sloping surface. To reduce the effect of such impediments as cartridge 159 slides along the upwardly sloping surface, small sliding ridges 180 on the sides of cartridge 159 set the distal end of boss or protrusion 174 back from the inner wall of groove 172 such that it does not rub against the inner wall of the groove or minimizes contact between protrusion 174 and the inner surface of the groove.

[0046] The sliding surface of the cartridge is thus realized primarily by first and second sliding surfaces 181, 180 which cooperate respectively with the upwardly sloping surface and sidewall of lip 176. Cooperation between first and second sliding surfaces 181, 180 and respective portions of the contoured sections and upstanding lip 176 ensures a substantially smooth sliding surface. Small ridges 180 on the sides of cartridge 159 can be treated with a lubricant or can comprise a lubricant to aid movement of cartridge 159 along the contoured sections (158a and b).

[0047] The single contoured section 158 and guide 172 can be formed as a unitary body or can be formed from separate parts, for example, from a molding process or 3D printing. A variety of materials can be used to fabricate the contoured section and guide. These include, but are not limited to, plastic, metal, or ceramic. The contoured section and / or guide can be removably attached to the support plate 157, for example, by one or more bolts. Because the cartridge 159 is configured to slide along the contoured sections, wear on the contoured sections is reduced, and thus the contoured sections 158a,b require less frequent replacement. Furthermore, the sliding surface between the cartridge 159 and the contoured sections 158(a and b) helps to reduce the impact force of the lifting element 70 carried by the robotic load handling device, which weighs as much as 150 kg, exerting a substantially lateral force on the charging unit 156 as the lifting element 70 moves along the contoured sections 158(a and b). This not only reduces wear on at least one of the plurality of contoured sections 158 ( a and b ), but also prevents damage to the support structure of the charging station that supports the charging unit 156 .

[0048] Although the cartridge 159 shown in Figs. 9 to 11 is configured to slide along the contoured section when the lifting element 70 is driven into the charging unit 156, the present invention is not limited to the cartridge 159 with one or more sliding surfaces. The movement of the cartridge along the contoured section may be assisted by one or more roller bearings (not shown). The sliding surface between the cartridge and the contoured section may be configured with one or more roller bearings. For example, the one or more roller bearings may be present in a groove 172 that cooperates with a boss or protrusion 174 of the cartridge. Alternatively, the boss or protrusion of the cartridge 159 may be provided with one or more roller bearings that are received in a groove of at least two elements. Similarly, the one or more roller bearings may be present on the underside of the cartridge. In all of the different options, the lifting element 70 may move along the contoured section by being seated in the cartridge 159 that may move along the contoured section to reduce excessive wear on the contoured section and to reduce impact forces on the charging unit 156.

[0049] Although attempts are made to ensure smooth progression of the cartridge 159 along the multiple contoured sections while being guided by the grooves, there may still be a "blockage" of the contact surfaces between the cartridge 159 and the multiple contoured sections 158(a and b) and / or the guides 172, causing the cartridge 159 to come to a premature standstill between the ends 178 of the guides 172. This is particularly the case when the lifting element 70 is pulled out of the charging unit 156 by the robotic load handling device as it attempts to disengage from the charging station. During the withdrawal of the lifting element 70 from the charging unit 156, the cartridge 159 moves downwards by gravity and / or is pulled along the contoured sections towards the mouth or entrance of the multiple contoured sections 158(a and b). Ideally, the cartridge 159 gripping the underside of the lifting element 70 remains in contact with the underside of the lifting element 70 as the lifting element is withdrawn from the charging unit 156. However, if there are one or more obstructions along the contoured sections and / or guides, the lifting element will tend to decouple from the cartridge, leaving the cartridge stuck before it has a chance to reach the stops at the entrance to the multiple contoured sections. Thus, when the next robotic load handling device attempts to dock at the charging station, it will not be able to present the cartridge 159 to the lifting element 70 at the entrance to the contoured section, thereby increasing the risk of the lifting element 70 impacting the contoured sections 158(a and b), thus returning to the problems with the prior art arrangements discussed above.

[0050] In one embodiment of the invention, the cartridge may comprise one or more magnets 182 that are magnetically attracted to the lifting element 80 as the lifting element moves along the multiple contoured sections 158 (a and b) and thus remain in contact with the lifting element 70. Thus, when lowered from the charging station, the cartridge 159 remains in contact with the lifting element 70 as the lifting element is withdrawn from the charging unit 156, i.e. the magnets ensure that the cartridge is pulled back to the entrance of the contoured section as the lifting element 70 attempts to leave the charging unit. The cartridge 159 remains in contact with the lifting element 70 until it abuts against the stop 178 of the guide 172, after which the lifting element 70 decouples from the cartridge 159. The one or more magnets 182 are sized to ensure that the cartridge 159 remains in contact with the lifting element 70 as it moves along the multiple contoured sections (a and b), but that there is sufficient magnetic attraction to decouple from the lifting element 70 when the cartridge 159 hits the stop 178 as the lifting element 70 is withdrawn from the charging unit 156. Ensuring that the cartridge 159 remains in contact with the lifting element 70 as it is being withdrawn from the charging unit 156 ensures that the cartridge 159 reaches or is returned to the entrance or mouth of the multiple contoured sections 158 (a and b) to receive the lifting element 70 from the next robotic load handling device. Other means for ensuring that the cartridge 159 remains in contact with the lifting element 70 as it is being withdrawn from the charging unit 156 are possible in the present invention. For example, the mouth 170 of the cartridge 159 can be shaped so that the underside of the lifting element 70 interacts with the cartridge in a snap-fit ​​arrangement, and the cartridge decouples from the lifting element 70 when the lifting element 70 is pulled out of the charging unit 156.Alternatively, the charging head assembly 152 may include a motor to move the cartridge 159 toward the entrance of the plurality of contoured sections 158(a and b). The return feature may alternatively be a resilient member, such as a spring, that biases the cartridge 159 toward the entrance of the plurality of contoured sections 158(a and b).

[0051] To allow movement of the charging unit 156 in the vertical direction, the charging unit 156 forms part of a charging head assembly 152 that is resiliently mounted on the carriage 135 (see Figures 15 and 17). Figure 13 shows an example of a charging head assembly 152 according to the invention, comprising a housing 190 that accommodates the charging unit 156. Further details of the charging head assembly are described in WO 2019 / 215221 (Ocado Innovation Limited), the contents of which are incorporated herein and described above in the introductory part of this patent specification. The housing 190 supports the charging unit 156 such that the charging unit 156 is not vertically movable relative to the housing 190, but is horizontally movable within the housing 190 as a result of the lower surface of the lifting element 70 of the robotic load handling device 30 contacting the cartridge 159. Figures 13 and 14 also show a bracket 192 for mounting the charging head assembly 152 to a suitable support structure such as shown in Figures 15 and 16, or to a carriage as described in WO 2019 / 215221 (Ocado Innovation Limited), the contents of which are incorporated herein.

[0052] The bracket 192 can resiliently mount the charging head assembly 152 to a suitable support structure by a spring mechanism 194. One end of the bracket 192 is fixedly attached to the support structure, and the charging head assembly 152 is resiliently attached to the other end of the bracket to allow vertical movement of the charging head assembly 152 relative to the bracket 192. The spring mechanism 194 between the charging head assembly 152 and the bracket 192 allows vertical movement of the charging head assembly 152 relative to the bracket 192. In a particular embodiment of the present invention, the spring mechanism comprises two springs 194 as shown in FIG. 13 for mounting the charging head assembly 152 to the bracket 192 and allowing vertical movement of the charging head assembly 152 relative to the bracket 192. Any number of springs can be used to resiliently mount the charging head assembly 152 to the bracket 192, or similarly, any type of resilient member, e.g., rubber, can be used. The resilient mounts provide a biasing force of the charging head assembly 152 toward the bracket 192 to absorb the shock of the downward vertical movement of the charging head assembly 152 due to interaction with the contoured section, and the return of the charging head assembly 152 to a position closer to the bracket 192 after charging. The effect of this is that a subsequent robotic load handling device that enters into a grid cell below the charging head assembly 152 will not first contact the charge delivery pad 163b of the charging unit 156, but instead will first contact the cartridge 159 of the charging unit 156. Furthermore, by varying the resilience, e.g., spring constant, of the resilient mounts, the clamping force acting on the robotic load handling device can be customized as needed for a particular application.

[0053] In use, when a robotic load handling device is commanded to charge at a charging station according to the present invention, the robotic load handling device is commanded to move into a grid cell in which a charging head assembly is positioned. When the load handling device enters the grid cell, the lifting element positioned at the top of the robotic load handling device interacts or engages with the cartridge 159 of the charging unit 156 to move the lifting element 70 and the cartridge 159 along the multiple contoured sections 158 (a and b) while being guided by the guide 172. This draws the charging unit 156 to the top of the robotic load handling device, which then brings the charge providing pad of the charging unit into electrical contact with the charge receiving pad. After charging is completed as determined by a communication signal between a rechargeable power source in the robotic load handling device and the charging station, the robotic load handling device moves away from the charging station. When the robotic load handling device moves away from the grid cell, the lifting element is withdrawn from the charging unit 156. This withdraws the lifting element from the multiple contoured sections. As the lifting element is to be withdrawn from the multiple contoured sections, the cartridge 159 grips the underside of the lifting element 70 due to magnetic attraction between the lifting equipment and the one or more magnets of the cartridge 159, causing the cartridge to move with the lifting element. The cartridge 159 is returned to the entrance or mouth of the multiple contoured sections 158(a and b) and decouples from the lifting element after the cartridge 159 hits the stop 178 of the guide 172, thereby presenting the cartridge 159 for a subsequent robotic load handling device.

[0054] The charging unit 156 of the present invention can be easily retrofitted to existing charging head assemblies such as those taught in WO 2019 / 215221 (Ocado Innovation Limited). FIG. 14 shows the mounting of the charging unit 156 of the present invention in the housing 190 in the correct orientation. In this example, one or more bolts are used to mount the charging unit 156 to the housing 190. The charging unit 156 can be easily removed from the housing 190 after removing one or more end plates to service the charging unit 156 or to retrofit the charging unit with the charging unit 156 according to the present invention. The ability to retrofit the charging unit 156 of the present invention allows the charging unit of the present invention to function as a "cassette". The housing 190 with the charging unit 156 is mounted to a bracket 192 by one or more bolts. The bracket 192 may mount the charging head assembly to a carriage such as that taught in WO 2019 / 215221 (Ocado Innovation Limited) and shown in FIG. 6, or to a support structure according to an alternative embodiment of the invention.

[0055] Referring to FIG. 6, the existing charging station 37 comprises a main structure 50, a pulley system 54, a clamp, a carriage 35, and a charging head assembly 52. ​​The main structure 50 may include rails or guides (not shown) on which the carriage 35 is movable. The pulley system 54 can operate the carriage 35 under manual or automatic operation to move the carriage 35 along a section of the main structure 50 on the rails or guides to a safe position away from the grid framework structure 14. Retracting the carriage 35 allows servicing of the components attached to the carriage 35 from a safe position away from the grid framework structure 14. The clamps attach the main structure 50 of the charging station 37 to any edge of the grid framework structure 14. The clamps are attached to two vertical upright structures 16 that form the grid framework structure 14. Mounting the charging station 37 to the grid framework structure 14 rather than adjacent to it helps address tolerances in the grid framework structure 14 due to manufacturing / installation and / or thermal expansion that would otherwise cause alignment issues that can be resolved because the clamps effectively move the charging station 37 with the grid framework structure 14. The problem with lifting or pulling up the carriage supporting the charging head assembly 52 to service is that this adds an additional layer of complexity to the charging station 37, not to mention the manual effort and time to pull up the carriage 35 to service the components of the charging head assembly 52.

[0056] The charging head assembly 152 of the present invention may be attached to a grid cell by a suitable stand as taught in PCT Patent Publication WO 2015 / 019055 (Ocado), the details of which are incorporated herein by reference. Alternatively, the charging head assembly 152 may rotate about a vertical axis extending through the stand such that the charging head assembly 152 can service multiple grid cells.

[0057] In an alternative embodiment of the charging station according to the invention, the carriage 135 for supporting the charging head assembly 152 is a "swing arm" rotatably mounted on a suitable stand or leg 150 such that the carriage 135, and thus the charging head assembly 152, can be rotated from a first position to a second position about a vertical axis XX extending through the stand or leg 150. The first position can be an operational position (see FIG. 15) such that the charging head projects over at least one grid cell, and the second position can be a service position (see FIG. 16) such that access to at least one charging head assembly 152 is obtained from the rear of the charging station. Thus, instead of pulling the carriage along the main structure, the carriage 135 can be a swing arm mounted on a suitable base 150, for example a stand or leg. This removes the need for the main structure to carry the carriage when the carriage 135 forms part of the main structure. The swing arm still remains capable of supporting at least one charging head assembly 152 in a cantilevered manner on the grid cell. The handle 196 can assist in the rotation of the charging head assembly 152 from the operational position to the service position and vice versa. Alternatively, the rotation of the swing arm 135 can be motorized. In the case where the charging station 137 is mounted on the edge of the grid structure such that the charging head assembly 152 protrudes over the grid cell in the operational position, the swing arm 135 can be rotated to the service position, i.e., the charging head is swung back away from the grid structure to gain access to the charging head assembly 152. One way to achieve this angular orientation of the swing arm 135 from the operational position to the service position is for the operational position to be directly opposite the service position. The lower end of the leg or stand is attached to the grid framework structure by suitable clamps to accommodate tolerances in the grid framework structure and movement resulting from expansion / contraction of the grid members that make up the grid framework structure.

[0058] An expanded view of the "swing" arm 135 for rotating the charging head assembly 152 about a vertical axis is shown in FIG. 17. Here, the charging head assembly 152 is attached to a first end of the swing arm 135 via a bracket 192 as discussed above, and the second end of the swing arm 135 is rotatably attached to a leg or stand 150. The rotatable attachment of the second end of the swing arm 135 can be any rotary mechanism known in the art. For example, the rotary mechanism can be provided by a bearing and / or bushing assembly 198. The rotary mechanism can be motorized. One or more locking mechanisms (not shown) can be provided on the swing arm 135 to lock the swing arm in an operational position when the charging head assembly protrudes over a grid cell and to lock the swing arm in a service position to gain access to the charging head assembly for servicing. 17, the swing arm or carriage 135 may be pivotally mounted to the base by a hinge 200 to permit rotation about a horizontal axis extending through the hinge 200. The hinge 200 allows the charging head assembly to be flipped upwardly for inspection of the components of the charging head assembly when moved to a service position.

[0059] 16-18, the charging station 137 includes two charging head assemblies 152, each of which overhangs an adjacent grid cell suitable for simultaneously charging two robotic load handling devices. Each of the two charging head assemblies 152 is resiliently mounted to a different portion of the swing arm 135 and is separably movable relative to the swing arm 135. In a particular embodiment of the invention, the charging head assemblies 152 are resiliently mounted on either side of the swing arm 135 such that they are laterally disposed on either side of the swing arm 135.

[0060] While a particular embodiment of the invention illustrates two charging head assemblies 152 resiliently mounted to the swing arm 135, the invention is not limited to two charging head assemblies 152 and can include multiple charging head assemblies. For example, and as shown by the perspective view of the charging station 237 in FIG. 18, one or more swing arms 135 can be rotatably mounted to the stand 150 such that the charging station resembles a "tree," with each of the one or more swing arms 135 supporting one or more charging head assemblies 152. For example, multiple swing arms 135 can be rotatably mounted to the stand or base 150, with each of the multiple swing arms 135 supporting one or more charging head assemblies 152. The multiple swing arms 135 provide a first set of charging head assemblies mounted to a first swing arm 135a operable on one or more grid cells, and a second or spare set of charging head assemblies mounted to a second swing arm 135b in a service position. When it is necessary to service one or more of the charging head assemblies in the operational position to reduce downtime for servicing the charging head assemblies, the second or spare set of charging head assemblies mounted on the second swing arm 135b can be rotated to the operational position and the first swing arm 135a supporting the first set of charging head assemblies is moved to the service position. The first swing arm 135a and the second swing arm 135b can be connected together such that the rotation of the first swing arm 135a causes the rotation of the second swing arm 135b. Thus, while the first set of charging head assemblies is being serviced, the charging station 237 is still operational as the second set of charging heads is moved to the operational position. The multiple swing arms 135(a and b) can be arranged on a single stand or base 150 such that the charging station can include a rotationally symmetrically arranged set of charging head assemblies mounted on the multiple swing arms.For example, a set of charging head assemblies may be mounted on multiple swing arms in a star configuration.

[0061] Having a charging station with multiple swing arms also has the advantage of supporting a set of one or more charging head assemblies, with each swing arm extending in a different direction to simultaneously charge multiple robotic load handling devices. For example, and as shown in FIG. 18, the charging station can be mounted toward the interior of the grid structure such that the set of charging head assemblies overhangs multiple grid cells, rather than mounting the charging station to the edge of the grid framework structure. In other words, each of the swing arms can be oriented such that the charging head assembly mounted to each of the swing arms overhangs a separate grid cell, i.e., multiple swing arms can be mounted to the base 150 in a "star"-like fashion to allow multiple robotic load handling devices to dock to a given charging head assembly. In such a configuration, the swing arms do not need to be made rotatable, since each of the swing arms is in an operable position. In FIG. 18, the lower end of the stand or foot is shown attached to a suitable anchor point on the grid cell. In the particular embodiment shown in FIG. 18, the base or stand 150 of the charging station 237 is attached to the grid cell by a suitable scaffold or clamp.

[0062] The charging head assembly described with reference to Figures 13 to 18 is not limited to the charging unit shown in Figure 9 but may comprise a charging unit as shown in Figure 7 in the sense that the charging head assembly is mounted on a swing arm or carriage that is rotatably mounted to a base about a vertical axis extending through the base.

[0063] As previously described, the base of the charging station can be mounted directly on the grid framework structure. FIG. 19 shows a grid clamp 201 that can mount the base of the charging station on an individual grid cell or across two or more grid cells. The grid clamp is removably attached to the grid and can therefore be positioned anywhere on the grid framework structure. The grid clamp comprises an elevated platform 203 onto which the base 150 of the charging station can be fitted. At each corner of the elevated platform are fastening points 207 that allow the base 150 of the charging station to be attached to the elevated platform 203. The elevated platform shown in FIG. 19 aids in the manipulation and positioning of the grid clamp 201 and comprises a central hole 211 for threading the power cable from the power source to the charging head. The hole may be circular in shape or the hole may be any shape that is useful for lifting and positioning the grid clamp on the grid and for threading the power cable. The elevated platform is supported by a first pair of parallel beams 205 (a and b) and a second pair of parallel beams 206 (a and b). The first pair of parallel beams (a and b) is perpendicular to the second pair of parallel beams 206 (a and b). The first pair of parallel beams 205 (a and b) is longer in length than the second pair of parallel beams 206 (a and b). In FIG. 19, the first pair of parallel beams 205 is approximately twice the length of the second pair of parallel beams 206. The raised platform 203 is attached to a center point on the first pair of parallel beams 205 (a and b). A clamp bracket 209 is attached to each end of the first pair of parallel beams 205 (a and b), each clamp bracket 209 facing outward so that the grid clamp 201 can fit inside a grid cell, or inside two or more grid cells. Each clamp bracket 209 includes a clamp portion 213 for fitting under a horizontal member of the grid. Each clamp bracket also includes an upper portion 215 that is attached to each end of the first pair of parallel beams 205 .Each clamp bracket 209 is sized and positioned such that it can fit over, hook around and under a horizontal member of the grid. Additionally, each clamp bracket 209 is slidably moveable along one of the first pair of parallel beams 205 such that it can slide toward the raised platform 203 to provide more room for maneuvering the grid clamp 201 when mating the grid framework structure. Additionally, the clamp brackets allow for fine adjustment of the charging head's position relative to the grid cell. This allows the charging head to properly interact with the lifting equipment of the robotic load handling device when the load handling device enters the grid cell.

[0064] FIG. 20 shows each clamp bracket 209 positioned closer to the grid clamp's platform 203 as the grid clamp is lowered onto the framework structure 14, specifically across a horizontal grid member between two grid cells. As shown in FIG. 20, when the grid clamp fits across a grid member between two grid cells, the distance D1 between the first pair of parallel beams must be greater than the width W1 of the grid member into which the grid clamp fits. Alternatively, when the grid clamp fits into an individual grid cell (as shown in FIG. 18), the distance D1 between the first pair of parallel beams must be less than the grid cell's width W2, and the distance D2 between the second pair of parallel beams must be less than the cell's length L. After the grid clamp is positioned in its desired location, each clamp bracket 209 can be slid away from the raised platform 203 and towards the grid framework structure's horizontal member 18, and the clamp portion 213 of each clamp bracket 209 can be attached by bolts to the underside of the grid's horizontal member 18, as shown in FIG. 21. The upper portion 215 of the clamp bracket may also be fastened in place by a bolt to each of the first pair of parallel beams 205. FIG. 22 is a top perspective view of the grid clamp 201 when fitted to the grid framework structure 14. To provide further fixation between the grid clamp 201 and the horizontal member 18 of the grid framework structure, a block 219 or track guide is inserted on top of the horizontal member 18 of the grid framework structure and under one end of each of the first pair of parallel beams 205 (a and b). Two blocks are used when mounting the grid clamp to the grid framework structure, and these two blocks are positioned on the same horizontal grid member. In particular, each block 219 is shaped and contoured to interlock with the contour of the horizontal grid member. This provides lateral support to the charging unit when the robotic load handling device interacts with the charging unit and during seismic activity.In FIG. 22, the block fits into a channel 19 in the top surface of the horizontal member 18 of the grid framework structure. The block 219 also includes a groove 221 into which the rail 21 on the top surface of the horizontal member 18 can fit. The block 219 can have different heights depending on the distance between the top surface of the horizontal member 18 and the bottom surface of each of the first pair of parallel beams 205 (a and b) after the clamping portion 213 of the clamping bracket 209 is fixed to the bottom surface of the horizontal member 18. Thus, if there is a measurement error in the height of, for example, the grid clamp 201 or the horizontal member 18 of the grid framework structure, the block is used to fill the gap between the horizontal member 18 and the first pair of parallel beams 205 (a and b). Other configurations of grid clamps may be used to attach the charging station base to the grid framework structure. The invention as originally claimed in the present application is set forth below. [1] A charging station (137) for a robotic load handling device (30) operable on a grid structure comprising a plurality of grid members arranged in a grid pattern comprising a plurality of grid spaces or grid cells, comprising: i) a support structure comprising a base (150) and at least one carriage (135); ii) at least one charging head assembly (52) for coupling with a charging receiving head of the robotic load handling device (30), the at least one charging head assembly (52) extending outwardly from the base (150) and resiliently mounted to the at least one carriage (135) such that the at least one charging head assembly (52) is vertically movable relative to the at least one carriage (135); Equipped with The at least one carriage (135) is mounted to the base (150) for rotation about a vertical axis extending through the base such that the at least one charging head assembly (52) is rotatable about the vertical axis from a first position to a second position. [2] The charging station of [1], wherein the at least one carriage (135) comprises a first carriage and a second carriage, the at least one charging head assembly (52) comprises a first set of charging head assemblies and a second set of charging head assemblies, the first set of charging head assemblies being resiliently mounted to the first carriage and the second set of charging head assemblies being resiliently mounted to the second carriage, and the first and second carriages are configured to rotate about the vertical axis to move the first set of charging head assemblies to the first position and the second set of charging head assemblies to the second position. [3] The charging station described in [2], wherein the first and second sets of charging head assemblies (152) are rotationally symmetrically arranged around the vertical axis. [4] the at least one charging head assembly (152) comprising a charging unit (56) for cooperating with a charge receiving head of the robotic load handling device (30), the charging unit comprising: i) a plurality of contoured sections (158); ii) a cartridge (159) for interfacing with a lifting element (70) of the robotic load handling device (30), the cartridge (159) being movable along the plurality of contoured sections (58, 60) to effect vertical movement of the at least one charging head assembly (52) relative to the charging receiving head of the robotic load handling device (30); A charging station according to any one of claims [1] to [3], comprising: [5] A charging station as described in any one of [1] to [4], wherein the first position is an operational position for charging a robotic load handling device (30) and the second position is a service position for servicing the at least one charging head assembly (52). [6] A charging station as described in any one of [1] to [5], wherein the first position is directly opposite the second position. [7] A charging station as described in any one of [1] to [6], wherein the at least one carriage (159) is rotatably mounted to the base by a rotating mechanism. [8] The charging station described in [7], wherein the rotary mechanism is provided with a bearing and / or a bush bearing. [9] The charging station described in [7] or [8], wherein the rotary mechanism is motorized.

[10] A charging station described in any one of [1] to [9], further comprising a locking mechanism for locking the at least one carriage in the first position and / or the second position.

[11] The charging station described in any one of [1] to

[10] , wherein the at least one carriage (135) is a swing arm.

[12] A grid structure comprising a first set of tracks and a second set of tracks extending transversely to the first set in a substantially horizontal plane, the second set of tracks being arranged in a grid pattern comprising a plurality of grid spaces or grid cells; A charging station (137) according to any one of [1] to

[11] , wherein at least one charging head assembly (52) of the charging station is mounted to the grid structure such that it overhangs a grid cell when the charging station is in a first position; A storage system comprising:

[13] The storage system of

[12] , wherein the charging station base is attached to at least one cell.

[14] The storage system of

[12] or

[13] , wherein the base of the charging station is clamped to at least one grid member.

[15] The storage system of

[14] , wherein the charging station is clamped to the at least one grid member by at least one grid clamp (201), the at least one grid clamp configured to clamp opposing surfaces of one or more grid members.

[16] The storage system of any one of

[12] to

[15] , wherein the charging station (137) is mounted to an edge of the grid structure, such that the carriage is rotatable about a vertical axis to move the at least one charging head assembly (52) toward the grid structure to the first position such that the at least one charging head assembly overhangs a grid cell, and away from the grid structure to a second position such that the at least one charging head assembly is accessible at the edge of the grid structure.

[17] The present invention further comprises a load handling device (30), the load handling device comprising: i) a drive mechanism operatively arranged to move the load handling device on the grid structure so as to traverse along the first and second sets of tracks on the plurality of grid spaces or grid cells; ii) a lifting device comprising a lifting drive assembly and a gripping device (39) configured, in use, to releasably grip a container (10) and lift said container from said stack (12) into a container receiving space when said load handling device is positioned above a stack (12) of containers (10) occupying a grid space or grid cell; iii) a charge receiving head for mating with said at least one charge head assembly (152); The storage system according to

[16] ,

Claims

1. 1. A charging station (137) for a robotic load handling device (30) operable on a grid structure comprising a plurality of grid members arranged in a grid pattern comprising a plurality of grid spaces or grid cells, the charging station comprising: i) a support structure comprising a base (150) and at least one carriage (135); ii) at least one charging head assembly (52) for coupling with a charging receiving head of said robotic load handling device (30), said at least one charging head assembly (52) extending outwardly from said base (150) and resiliently mounted to said at least one carriage (135) such that said at least one charging head assembly (52) is vertically movable relative to said at least one carriage (135); Equipped with the at least one carriage (135) is mounted to the base (150) for rotation about a vertical axis extending through the base such that the at least one charging head assembly (52) is rotatable about the vertical axis from a first position to a second position; The at least one charging head assembly (152) comprises a charging unit (56) for cooperating with a charge receiving head of the robotic load handling device (30), the charging unit comprising: i) a plurality of contoured sections (158); ii) sliding bearings (159) for interfacing with lifting elements (70) of the robotic load handling device (30), the sliding bearings (159) being movable along the contoured sections (158) to effect vertical movement of the at least one charging head assembly (52) relative to the charging receiving head of the robotic load handling device (30); Equipped with a charging station.

2. 2. The charging station of claim 1, wherein the at least one carriage (135) comprises a first carriage and a second carriage, the at least one charging head assembly (52) comprises a first set of charging head assemblies and a second set of charging head assemblies, the first set of charging head assemblies being resiliently mounted to the first carriage and the second set of charging head assemblies being resiliently mounted to the second carriage, and the first and second carriages configured to rotate about the vertical axis to move the first set of charging head assemblies to the first position and the second set of charging head assemblies to the second position.

3. The charging station of claim 2 , wherein the first and second sets of charging head assemblies (152) are rotationally symmetrically disposed about the vertical axis.

4. 4. The charging station of claim 1, wherein the first position is an operational position for charging a robotic load handling device (30) and the second position is a service position for servicing the at least one charging head assembly (52).

5. 5. The charging station of claim 1, wherein the first position is diametrically opposite the second position.

6. 6. The charging station of claim 1, wherein the at least one carriage (135) is rotatably mounted to the base by a rotary mechanism.

7. The charging station of claim 6 , wherein the rotary mechanism comprises a bearing and / or a bush bearing.

8. 8. A charging station according to claim 6 or 7, wherein the rotary mechanism is motorised.

9. 9. The charging station of claim 1, further comprising a locking mechanism for locking the at least one carriage in the first position and / or the second position.

10. Charging station according to any one of claims 1 to 9, wherein the at least one carriage (135) is a swing arm.

11. a grid structure comprising a first set of tracks and a second set of tracks extending transversely to the first set in a substantially horizontal plane, the grid structure being arranged in a grid pattern comprising a plurality of grid spaces or grid cells; A charging station (137) as claimed in any one of claims 1 to 10, wherein at least one charging head assembly (52) of the charging station is mounted to the grid structure such that it overhangs a grid cell when in a first position; A storage system comprising:

12. The storage system of claim 11 , wherein the charging station base is attached to at least one cell.

13. 13. The storage system of claim 11 or 12, wherein the base of the charging station is clamped to at least one grid member.

14. 14. The storage system of claim 13, wherein the charging station is clamped to the at least one grid member by at least one grid clamp (201), the at least one grid clamp configured to clamp opposing surfaces of one or more grid members.

15. 15. The storage system of claim 11, wherein the charging station (137) is mounted to an edge of the grid structure such that the carriage is rotatable about a vertical axis to move the at least one charging head assembly (52) toward the grid structure to the first position such that the at least one charging head assembly overhangs a grid cell and away from the grid structure to a second position such that the at least one charging head assembly is accessible at the edge of the grid structure.

16. The vehicle further comprises a load handling device (30), the load handling device comprising: i) a drive mechanism operatively arranged to move the load handling device on the grid structure traversing along the first and second sets of tracks on the plurality of grid spaces or grid cells; ii) a lifting device comprising a lifting drive assembly and a gripping device (39) configured, in use, to releasably grip a container (10) and lift said container from said stack (12) into a container receiving space when said load handling device is positioned above a stack (12) of containers (10) occupying a grid space or grid cell; iii) a charge receiving head for mating with said at least one charge head assembly (152); The storage system of claim 15 .

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