Apparatus for retrieving units from a storage system

Patent metadata

Field	Value
Publication number	US-10913602-B2
Application number	US-202016902459-A
Country	US
Kind code	B2
Filing date	Jun 16, 2020
Priority date	Aug 9, 2013
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A storage system and a load handling device for lifting and moving containers stacked in the storage system are described. The storage system includes a plurality of rails or tracks arranged in a grid pattern above the stacks of containers. The grid pattern can include a plurality of grid spaces and each stack is located within a footprint of only a single grid space. The load handling device is configured to move laterally on the rails or tracks above the stacks. The load-handling device includes a container-receiving space located above the rails or tracks in use and a lifting device arranged to lift a container from a stack into the container-receiving space. The load handling device has a footprint that, in use, occupies only a single grid space in the storage system.

First claim

The invention claimed is:

1. A storage system comprising:
a first set of parallel rails or tracks extending in an X-direction, and a second set of parallel rails or tracks extending in a Y-direction transverse to the first set of rails or tracks in a substantially horizontal plane to form a grid pattern having a plurality of grid spaces;
a plurality of stacks of containers located beneath the first and second set of rails or tracks, and arranged such that each stack is located within a footprint of a single grid space; and
a multiplicity of load handling devices, wherein each load handling device includes:
a wheel assembly having a first set of wheels for engaging with the first set of rails or tracks to guide device movement in the X-direction and a second set of wheels for engaging with the second set of rails or tracks to guide device movement in the Y-direction, such that each load handling device is configured to selectively move laterally in the X- and Y-directions, above the plurality of stacks on the first and second sets of rails or tracks:
a container-receiving space arranged to be located above the first and second sets of rails or tracks for accommodating a container when received from the plurality of stacks:
a lifting device arranged to lift the container from a stack of the plurality of stacks into the container-receiving space, and
an external housing that is shaped substantially in a cuboid having two sides facing the X-direction, two sides facing the Y-direction, and a top facing a Z-direction, such that the external housing substantially encloses the container-receiving space from above and on all four sides of the load handling device, a side of the external housing facing the Y-direction extending no further, in the Y-direction, than the first set of wheels on that side of the load handling device, and a side of the external housing facing the X-direction extending no further, in the X-direction, than the second set of wheels on that side of the load handling device, such that a load handling device of the multiplicity of load handling devices will occupy a grid space and will not obstruct a load handling device of the multiplicity of load handling devices occupying or traversing an adjacent grid space in the X-direction and will not obstruct a load handling device of the multiplicity of load handling devices occupying or traversing an adjacent grid space in the Y-direction.

2. The storage system according to claim 1 , wherein the lifting device comprises a gripper device configured to grip the container from above the container.

3. The storage system according to claim 2 , wherein each load handling device comprises a lifting mechanism configured to raise and lower the gripper device relative to the container-receiving space.

4. The storage system according to claim 3 , wherein each load handling device comprises:
an upper part housing components which include at least one of power components, control components, drive components or lifting components; and
a lower part including the container-receiving space, wherein the lower part is arranged directly beneath the upper part.

5. The storage system according to claim 4 , wherein the wheels in the first or second set of wheels are arranged around a periphery of the container-receiving space.

6. The storage system according to claim 5 , wherein one or more of the first or second set of wheels on each load handling device comprises a wheel hub motor.

7. The storage system according to claim 6 , wherein at least one of the first or second set of wheels on each load handling device, is configured to be raised and lowered with respect to the other of the first or second set of wheels.

8. The storage system according to claim 1 , wherein each load handling device comprises:
an upper part housing components which include at least one of power components, control components, drive components or lifting components; and
a lower part including the container-receiving space, wherein the lower part is arranged directly beneath the upper part.

9. The storage system according to claim 1 , wherein the wheels in the first or second set of wheels are arranged around a periphery of the container-receiving space.

10. The storage system according to claim 1 , wherein one or more of the first or second set of wheels on each load handling device comprises a wheel hub motor.

11. The storage system according to claim 1 , wherein at least one of the first or second set of wheels on each load handling device, is configured to be raised and lowered with respect to the other of the first or second set of wheels.

12. A load handling device configured for a storage system having a first set of parallel rails or tracks extending in an X-direction, and a second set of parallel rails or tracks extending in a Y-direction transverse to the first set of rails or tracks in a substantially horizontal plane to form a grid pattern having a plurality of grid spaces, with a plurality of stacks of containers located beneath the first and second sets of rails or tracks, and arranged such that each stack is located within a footprint of a single grid space, the load handling device comprising:
a wheel assembly having a first set of wheels for engaging with a first set of rails or tracks to guide device movement in an X-direction and a second set of wheels for engaging with a second set of rails or tracks to guide device movement in a Y-direction, the load handling device being configured to selectively move laterally in the X- and Y-directions, above stacks on the first and second sets of rails or tracks;
a container-receiving space for accommodating a container from a stack of the stacks;
a lifting device arranged to lift the container from the stack into the container-receiving space; and
an external housing that is shaped substantially in a cuboid having two sides for facing the X-direction, two sides for facing the Y-direction, and a top for facing a Z-direction, the load handling device being configured to move above the stacks on the first and second sets of rails or tracks, the external housing substantially enclosing the container-receiving space from above and on all four sides of the load handling device, and wherein a side of the external housing facing the Y-direction extends no further, in the Y-direction, than the first set of wheels on that side of the load handling device, and a side of the external housing facing the X-direction extends no further, in the X-direction, than the second set of wheels on that side of the load handling device, such that when the load handling device is located above the stack and occupying a grid space, the load handling device will not obstruct a load handling device occupying or traversing an adjacent grid space in the X-direction and will not obstruct a load handling device occupying or traversing an adjacent grid space in the Y-direction.

13. The load handling device according to claim 12 , wherein the lifting device comprises a gripper device configured to grip the container from above the container.

14. The load handling device according to claim 13 , further comprising a lifting mechanism configured to raise and lower the gripper device relative to the container-receiving space.

15. A load handling device according to claim 14 , further comprising:
an upper part housing components which include at least one of power components, control components, drive components or lifting components; and
a lower part including the container-receiving space, wherein the lower part is arranged directly beneath the upper part.

16

Assignees

• Ocado Innovation Ltd

Inventors

• Lindbo Lars Sverker Ture
• Stadie Robert Rolf
• Whelan Matthew Robert
• Brett Christopher Richard James

Classifications

• B65G1/0464 Primary

  with access from above · CPC title

• B65G1/04 Primary

  mechanical · CPC title

• B65G59/02

  De-stacking from the top of the stack · CPC title

• B65G57/03

  from above · CPC title

• B65G1/0414 Primary

  provided with satellite cars adapted to travel in storage racks · CPC title