Qhov tshwm sim ntawm Trolley Case

Thaum yuav ib lub hnab mus txawv tebchaws, cov neeg siv khoom yuav tsum xub xyuas nws sab nrauv. Txheeb xyuas tias rooj plaub no zoo-zoo li tus thiab sib npaug- sawv ntsug ncaj lossis muab nws tso rau pem hauv ntej kom ntseeg tau tias tag nrho plaub lub kaum sab xis ua kom tsis txhob qaij, thiab xyuas kom meej tias qhov chaw du thiab tsis muaj khawb lossis tawg; them tshwj xeeb mloog mus rau symmetry ntawm plaub fab ntawm ob sab saum toj thiab hauv qab plhaub. Qhib rooj plaub thiab tshuaj xyuas qhov kaw; cov npoo yuav tsum ua kom zoo nrog qhov sib txawv me me, thiab qhov haum yuav tsum nruj. Hinges yuav tsum ua haujlwm zoo yam tsis muaj qhov nplaum, thiab latches lossis buckles yuav tsum ceev kom ruaj ntseg tsis tau qhib tau yooj yim. Sab hauv hauv ob sab phlu yuav tsum ruaj khov, thiab cov ntaub tsis muaj rub los yog kua muag. Cov tes tuav (ob qho tib si nqa thiab nqa) yuav tsum tau txuas nrog kev ruaj ntseg tsis muaj xoob. Lub telescopic kov yuav tsum ncua thiab thim rov qab ywj pheej thaum tswj kev ua haujlwm zoo; qhov haum ntawm zawv zawg thiab ntu ntu yuav tsum yog qhov tseeb, tsis txhob ua si ntau dhau. Nias lub xauv khawm yuav tsum tso cai rau kev ncua ntxiv thiab thim rov qab. Cov log yuav tsum tig dawb; cov nruab nrog bearings yog nyiam dua. Txhawm rau kuaj lub ntsuas phoo, sim teeb tsa ntau tus lej sib txuas kom paub meej tias nws qhib thiab kaw kom raug.