Pob khawm yog dab tsi peb feem ntau hu ua hinges. Nyob rau hauv cov txheej txheem ntawm nquag qhib thiab kaw ntawm chav dej txee lub qhov rooj (ua kom zoo nkauj), hinges tau withstood qhov ntsuas feem ntau.
Yuav luag txhua lub duav uas pom ntawm lub khw yog tshem tau thiab muab faib ua ob ntu: lub hauv paus thiab buckle. Pob khawm feem ntau muaj daim npav ob-taw tes thiab daim npav peb-taw tes ua haujlwm, thiab pob khawm nrog daim npav peb-point ua daim npav yog qhov tseeb dua. Lub hlau siv rau pob khawm yog qhov tseem ceeb tshaj plaws. Yog tias qhov kev xaiv tsis zoo, tom qab ib lub sijhawm, lub qhov rooj vaj huam sib luag tej zaum yuav muab tais rau pem hauv ntej thiab nraub qaum, swb lub xub pwg nyom thiab cov ces kaum uas poob. Yuav luag txhua hom loj ntawm chav dej txee chav kho vajtse siv cov ntawv txias-txias, thiab lawv cov tuab thiab tawv tawv zoo meej. Ntxiv rau, sim xaiv lub khawm nrog ntau qhov chaw. Lub npe ntawm cov ntsiab lus sib txuam ntau txhais tau tias lub qhov rooj vaj huam sib luag tuaj yeem nyob ntawm txhua lub kaum sab xis thaum nws qhib. Nws yuav tsis yog lub zog ua rau qhib lossis kaw tam sim ntawd, yog li ua kom muaj kev ruaj ntseg ntawm kev siv. Qhov no tseem ceeb tshwj xeeb rau kev nqa-up phab ntsa txee qhov rooj. Raws li cov kws tshaj lij, cov hinges nrog ntau qhov zoo thiab qhov tsis zoo muaj kev xav sib txawv thaum siv. Lub pob khawm nrog cov khoom siv zoo tshaj plaws muaj lub zog softer thaum qhib lub qhov rooj tub rau khoom, thiab yuav cia li thim rov qab thaum nws kaw rau 15 degrees, thiab lub zog quab yuam yog zoo heev. Inferior hinges muaj kev pabcuam luv luv lub neej thiab yooj yim ntog tawm. Xws li cov txee qhov rooj thiab cov phab ntsa thaiv phab ntsa uas poob qis feem ntau yog ua rau muaj qhov tsis zoo ntawm cov hinges.
