Elevators feem ntau tau suav ib feem ntawm kev tsim kho kev tsim kho. Cov tsev lag luam elevators yog ib qho tseem ceeb ntawm cov tuam tsev, tshwj xeeb yog cov chaw ua lag luam, cov chaw harms, kev thauj khoom, muab cov neeg muaj kev thauj mus los yooj yim. Raws li cov cuab yeej siv thauj khoom ntsug, cov hlau zoo nkauj mounting nkhaus tuaj yeem ua kom cov haujlwm ua haujlwm tau zoo ntawm of the elevator thiab txuas ntxiv nws txoj kev pabcuam lub neej.