FIG . 7 is a cross - section illust

FIG . 7 is a cross - section illustration of a cryogenicstorage freezer with a rack carrier coupled to a drive shaftand motor in accordance with aspects of the disclosedembodiment . FIG . 7 shows a freezer 120 in an automatedconfiguration with an attached motor assembly 130 andautomated door 140 . A rack carrier 360 is positioned insidean inner wall 725 of the freezer 120 and supported by a driveshaft 231 connected to the motor assembly 130 . A refrigerantaccess port 109 supplies a cryogenic liquid to a bottom zone729 of the freezer , the cryogenic fluid may pool and contactthe lower portion 362 of the outer wall 361 of the rack carrier360 to cool the top plate 250 . The drive shaft 231 includesa spherical bearing 733 configured to rest against a race 729coupled to the freezer cover 121 . In a manual operationconfiguration , the rack carrier 360 hangs from the drive shaft231 and is supported by the spherical bearing 733 seatedagainst the race 729 . In some embodiments , the drive shaft231 may only be present once the freezer is configured forautomatic rotation , e . g , the rack carrier 360 may be fullysupported by a bearing in manual operation without thedrive shaft 231 . In the automated configuration shown inFIG . 7 , the rack carrier 360 hangs from the drive shaft 231and the drive shaft 231 may be supported from the motorassembly or an external drive system by , for example , a gearsystem .