Isihloko: Umlando wemibhede yesofa: Kusukela kumamodeli angaguquguqukiyo okuqala kuya kumamodeli esimanje angu-3 ku-1
Amagama angukhiye: umlando wemibhede yesofa, ukuvela kwefenisha engaguquguqukiyo, umsuka wombhede wesofa
Incazelo ye-Meta: Zitholele ukuthi imibhede yesofa yaguquka kanjani kusukela kumamodeli angama-19 enkulu angasongwa kuya kumamodeli esimanje angu-3 ku-1 acindezelwe nge-vacuum, abuyekeza indlela yokonga isikhala.
Izihlalo-umbhede sezihambe ibanga elide kusukela ekuqaleni kwazo. Umqondo wawo ubuyela emuva eRoma lasendulo, lapho izihlalo eziningi zazisebenza njengesofa nendawo yokuphumula. Ngasekupheleni kwawo-1800, abasunguli abanjengoSarah E. Goode noLeonard C. Bailey banelungelo lobunikazi ezihlalo ezigoqekayo, babeka isisekelo sokwakhiwa kwesimanje. Ngama-1930, uBernard Castro washintsha imboni nge-"Castro Convertible," okwenza izihlalo-umbhede zibe into ejwayelekile emakhaya. Namuhla, izinto ezintsha ezifana nokucindezela nge-vacuum nokuba nezicucu eziningi seziziguqule zabangama-piece asebenza kakhulu njengesihlalo-umbhede sethu esingu-3-in-1, sihlanganisa ukunethezeka nokulula ukuze kuphile kwesimanje.