the.com/flatbed

A truck with no walls, because some loads refuse to be boxed in.

means A vehicle or scanner with a flat, level surface for carrying or capturing things without sides to get in the way.

from Simply 'flat' plus 'bed' — bed in the old sense of 'a level supporting base,' the same sense you get in riverbed or flowerbed. First used for the open, floor-like cargo platform on trucks and trailers, then borrowed in the 20th century for scanners and printers that also work by laying things flat on an exposed surface rather than feeding them through.

name origin
flat open deck, literally a bed with no sides
scanner cousin
flatbed scanners borrowed the name for their flat glass bed
towing use
carries whole cars instead of dragging them on wheels
load logic
no walls means cranes can drop cargo straight from above
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