UJack umiiwucezu oluqinile lokujikijela njengedivayisi esebenzayo, ngokusebenzisa uzipho lwe-bracket ephezulu noma lwe-bracket engezansi ngaphakathi kohambo oluncane ukuvula isisindo semishini yokuphakamisa encane elula. I-Jack isetshenziswa kakhulu ezimbonini, ezimayini, ezokuthutha nakweminye iminyango njengokulungisa izimoto kanye neminye imisebenzi yokuphakamisa, ukwesekwa kanye neminye. Isakhiwo sayo silula futhi siqinile, siyaguquguquka futhi sithembekile, futhi singathwalwa futhi sisetshenziswe ngumuntu oyedwa.Ibhalansi Yamathayi isetshenziselwa ukukala ukungalingani kwe-rotor, umshini wokulinganisa ungowomshini wokulinganisa osekelwa kanzima, ukuqina kohlaka lokujika kukhulu kakhulu, ukungalingani kwe-rotor kulungiswa ngemiphumela yokulinganisa umshini wokulinganisa onamandla, ukuze kuncishiswe ukudlidliza, kuthuthukiswe ukusebenza futhi kuthuthukiswe ikhwalithi yomkhiqizo, ukudlidliza kwe-rotor noma ukudlidliza okusebenza kubhere kungancishiswa kube uhla oluvumelekile. I-Gantry crane iwukuguqulwa kwe-bridge crane, eyaziwa nangokuthii-crane yesitolo egoqekayo.Isetshenziswa kakhulu ekulayisheni nasekuthululeni izimpahla egcekeni langaphandle, egcekeni lezinto ezibonakalayo kanye nemithwalo emikhulu. I-Gantry crane isetshenziswa kabanzi emagcekeni emithwalo yechweba ngenxa yesilinganiso sayo sokusetshenziswa esiphezulu, ububanzi bokusebenza, ukuzivumelanisa nezimo okubanzi kanye nokuguquguquka okunamandla.