Tus choj crane yog cov cuab yeej tshem tawm rau kev nqa cov khoom ntawm qhov kev cob qhia, lub tsev muag khoom thiab cov khoom siv hauv tsev. Vim hais tias nws qhov xaus yog nyob rau siab siab cem kab los yog hlau txhawb, lawv ua zoo li txuas hniav. Tus choj crane lub longitudinal khiav hauj lwm raws li txoj kev khiav ntawm ob sab ntawm lub overhead crane yuav ua rau tag nrho siv ntawm qhov chaw nyob rau hauv tus choj thav duab rau hoist cov khoom, thiab yog tsis hindered los ntawm cov khoom hauv pem teb. Nws yog qhov feem ntau siv thiab ntau tshaj plaws ntawm cov lifting machinery.