This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
梪 combines 木 (tree/wood) with 豆 (bean/vessel). The exact historical development is uncertain, but it likely originally referred to a wooden vessel or stand.
A wooden 木 stand holding a bean-shaped vessel 豆. This might suggest a wooden container or pedestal, but the meaning is unclear.
For トウ, imagine a tall wooden stand shaped like a tower: tower -> トウ, holding the bean vessel.