Patent ID: 8550763

Claim:
A carriage for engaging and retaining a vertically driven cell comprising: a cell carrier; a portal engagement device having limited vertical movement with respect to said cell carrier, said portal engagement device configured to engage a vertical portal; a cam state machine fixed to said cell carrier configured to: A. when said portal engagement device is engaged with said vertical portal and receiving said vertically driven cell from said vertical portal, guide a spring loaded cam follower hook of said cell sideways from a rest position as said cell is driven vertically from said vertical portal to said portal engagement device; B. allow spring bias movement of said spring loaded cam follower hook back towards and short of said rest position; and C. engage said cam follower hook against downward movement, said cam follower hook thereby supporting said cell with respect to said cell carrier, and thereby engaging said cell, and retaining said cell against downward vertical movement with respect to said cell carrier, such that further downward vertical drive of said vertically driven cell from said portal engagement device instead moves said portal engagement device upward to disengage said portal engagement device from said vertical portal; and an interlock gate inserted at said cam state machine to prevent further spring bias movement of said spring loaded cam follower hook from said position of state C; wherein said cell carrier is additionally configured to: engage said cell against upward movement, such that further upward vertical drive of said vertically driven cell from said portal engagement device instead moves said portal engagement device downward to engage said portal engagement device with respect to a vertical portal.