Urunigi rwa batiri ni ikintu cyimukanwa, gikora imashini gikata hamwe n amenyo yometse kumurongo uzunguruka ugenda uyobora umurongo.Ikoreshwa mubikorwa nko gutema ibiti, gutema amaguru, gukubita, gutema, guca inkongi y'umuriro mu kuzimya umuriro wo mu gasozi no gusarura inkwi.Iminyururu ifite umurongo wabugenewe hamwe nuruhererekane rwateguwe byakozwe nkibikoresho byo gukoresha mu buhanzi bwurunigi no mu ruganda.Iminyururu yihariye ikoreshwa mugukata beto.Iminyururu rimwe na rimwe ikoreshwa mu guca urubura, urugero nko gushushanya urubura no muri Finlande mu koga.Umuntu ukoresha ibiti ni ibiti.
Patente ya mbere y '“urunigi rutagira iherezo” (icyuma kigizwe n’urunigi rw’imiyoboro itwara amenyo yabonetse kandi ikora mu cyerekezo) yahawe Samuel J. Bens wa San Francisco ku ya 17 Mutarama 1905. Umugambi we wo kugwa igiti kinini.Urunigi rwa mbere rwimurwa rwakozwe kandi ruhabwa patenti mu 1918 n’umwanditsi w’umunyakanada witwa James Shand.Amaze kwemerera uburenganzira bwe gutakara mu 1930 igihangano cye cyatejwe imbere n’icyabaye isosiyete yo mu Budage Festo mu 1933. Ubu isosiyete ikora nka Festool ikora ibikoresho by’amashanyarazi byoroshye.Abandi bagize uruhare runini mumurongo ugezweho ni Joseph Buford Cox na Andreas Stihl;aba nyuma bahaye patenti kandi batezimbere urunigi rwamashanyarazi kugirango rukoreshwe ahantu hacururizwa mu 1926 hamwe n’umunyururu ukoreshwa na lisansi mu 1929, maze bashinga isosiyete yo kubibyaza umusaruro.Mu 1927, Emil Lerp, washinze Dolmar, yateje imbere urunigi rwa mbere rukoreshwa na lisansi ku isi maze arukora cyane.
Intambara ya Kabiri y'Isi Yose yahagaritse itangwa ry’imyenda yo mu Budage muri Amerika ya Ruguru, bityo havuka inganda nshya zirimo Industrial Engineering Ltd (IEL) mu 1947, umusogongero wa Pioneer Saws.Ltd hamwe na Outboard Marine Corporation, uruganda rwa kera rukora iminyururu muri Amerika ya ruguru.
McCulloch muri Amerika ya ruguru yatangiye gukora iminyururu mu 1948. Moderi yo hambere yari iremereye, ibikoresho byabantu babiri bifite utubari ndende.Akenshi iminyururu yari iremereye kuburyo yari ifite ibiziga nkibikurura .Indi myambaro yakoreshaga imirongo yaturutse mumashanyarazi yibiziga kugirango atware umurongo.
Nyuma y’Intambara ya Kabiri y'Isi Yose, iterambere rya aluminium na moteri ryoroheje iminyururu kugeza aho umuntu umwe yashoboraga kuyitwara.Mu turere tumwe na tumwe, abakozi ba skidder (chainsaw) basimbuwe na feller buncher hamwe nuwasarura.
Iminyururu yasimbuye hafi ya byose byoroheje bikoreshwa n'abantu mumashyamba.Ziza mubunini bwinshi, uhereye kumashanyarazi mato mato agenewe gukoreshwa murugo no mu busitani, kugeza kuri "lumberjack" nini.Abagize imitwe ya injeniyeri ya gisirikare batojwe gukoresha iminyururu kimwe n’abashinzwe kuzimya umuriro mu kurwanya inkongi z’amashyamba no guhumeka umuriro wubatswe.
Igihe cyoherejwe: Gicurasi-26-2022