| CPC B65G 1/0464 (2013.01) [B61B 3/00 (2013.01); B65D 19/385 (2013.01); B65G 1/02 (2013.01); B65G 1/0478 (2013.01); B65D 2501/24554 (2013.01); B65D 2501/2456 (2013.01); B65D 2501/24573 (2013.01)] | 20 Claims |

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1. A track structure for supporting movement of a load handling device on top of a grid storage structure, the track structure comprising:
a plurality of track support sections arranged in a grid pattern; and
a plurality of track sections mounted on top of the track support sections, said plurality of track sections being arranged in the grid pattern of the plurality of track support sections;
wherein the plurality of track sections are arranged such that first joints at which any two track sections abut in the grid pattern are between second joints where two sections of the track support sections abut.
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18. A grid storage structure comprising:
a plurality of towers arranged in a grid pattern for receiving stacks of storage bins; and
a track structure for supporting movement of a load handling device on top of the grid storage structure, the track structure including,
a plurality of track support sections arranged in a grid pattern; and
a plurality of track sections mounted on top of the track support sections, said plurality of track sections being arranged in the grid pattern of the plurality of track support sections;
wherein the plurality of track sections is arranged such that first joints at which any two track sections abut in the grid pattern are between second joints where two sections of the track support sections abut, and
wherein the track structure is configured to be mounted on top of the plurality of towers.
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