Casement windows yog hom qhov rais uas tau nyob ib puag ncig rau ntau pua xyoo. Lo lus "casement" yog hais txog lub thav duab ntawm lub qhov rais, uas yog hinged raws ib sab thiab viav vias sab nraud zoo li lub qhov rooj. Cov qhov rais no tau tshwm sim hauv Tebchaws Europe thiab Tebchaws Meskas thaum 17th thiab 18th centuries, thiab lawv tseem nrov niaj hnub no.
Lub qhov rais qhov rais ntxov tshaj plaws yog ua los ntawm ntoo thiab tau hinged nyob ib sab. Lub thav duab tau haum nrog leaded iav panes, uas tau tuav nyob rau hauv qhov chaw los ntawm me me strips ntawm ntoo hu ua muntins. Cov qhov rais no tau tsim los qhib rau sab hauv, tab sis lawv tsis yooj yim rau kev khiav lag luam vim lawv qhov hnyav thiab kev sib txhuam los ntawm kev sib cuag ntoo ntawm ntoo.
Nyob rau hauv lub xyoo pua 18th, lub qhov rais casement tau hloov kho tshiab thaum hlau hinges tau qhia. Qhov no tso cai rau lub qhov rais mus hinged raws sab saum toj lossis hauv qab, ua kom yooj yim qhib thiab kaw. Iron casement windows kuj tso cai rau kev siv cov iav loj dua, uas muab lub teeb pom kev zoo dua thiab txhim kho qhov pom.
Lub xyoo pua 19th pom qhov kev taw qhia ntawm steel-framed casement windows. Cov qhov rais no muaj zog ntau dua li lawv cov ntoo counterparts, thiab lawv muaj peev xwm txhawb nqa cov iav loj dua. Steel casement windows tau siv dav hauv kev lag luam thiab kev lag luam vaj tsev nyob rau lub sijhawm no, tab sis lawv kuj tau nrov hauv kev tsim vaj tsev.
Thaum lub xyoo pua 20th, casement windows txuas ntxiv mus. Aluminium tau dhau los ua cov khoom siv nrov rau lub qhov rais casement, vim nws yog lub teeb yuag thiab muaj zog. Hauv xyoo 1960, vinyl qhov rais tau qhia, uas yog kev tu qis thiab siv zog.
Niaj hnub no, casement windows yog tsim los ntawm ntau yam ntaub ntawv xws li ntoo, txhuas, thiab yas. Lawv yog cov nrov rau lawv lub zog efficiency, yooj yim ntawm kev khiav lag luam, thiab muaj peev xwm muab qhov pom tseeb ntawm sab nraum zoov. Casement windows kuj muaj ntau yam thiab tuaj yeem siv ntau yam kev tsim vaj tsev, los ntawm ib txwm mus rau niaj hnub.
Hauv kev xaus, casement windows muaj keeb kwm nplua nuj uas muaj ntau pua xyoo. Los ntawm lawv qhov pib txo qis raws li cov ntoo thav ntawv nrog cov iav me me ntawm cov iav, mus rau cov qauv siv hluav taws xob niaj hnub no, lub qhov rais casement tau sawv qhov kev sim ntawm lub sij hawm thiab txuas ntxiv yog qhov kev xaiv nrov rau cov tswv tsev thiab cov kws tsim vaj tsev ib yam nkaus.
