| CPC H01L 21/67769 (2013.01) [A47B 57/06 (2013.01); B65G 1/0464 (2013.01); B65G 1/10 (2013.01); B66C 19/00 (2013.01)] | 18 Claims |
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1. A storage system comprising:
a storage device; and
a transfer device,
wherein the storage device comprises:
a guide bar,
a plurality of upper shelves connected to the guide bar, the plurality of upper shelves storing a material to be transferred,
a plurality of lower shelves disposed under the plurality of upper shelves, the plurality of lower shelves storing the material,
a plurality of guides connected to the plurality of upper shelves, and
a shelf returning device connected to a selected upper shelf from among the plurality of upper shelves,
wherein the transfer device comprises:
a body,
a drive module attached to the body, the drive module being configured to move the transfer device to be adjacent to the storage device,
a handling module attached to the body, the handling module being configured to handle the material, and
a shelf moving module attached to the body or the handling module, the shelf moving module contacting a selected guide from among the plurality of guides, and
wherein the shelf returning device comprises:
a counterweight; and
at least one support bar connected between a horizontal frame of the storage device and the counterweight, the at least one support bar configured to be rotated to extend substantially parallel to the guide bar in response to horizontal movement of at least one of the plurality of upper shelves or at least one of the plurality of lower shelves.
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