thawj "jackhammer" yog qhov kev xyaum ntaus nrig tsim hauv 1849 los ntawm Jonathon Couch. Thawj qhov tseeb, kev ua haujlwm jackhammer nrog lub taub hau zoo li lub taub hau tau tsim los ntawm tus txiv neej Askiv William Mcreavy, uas tam sim muag patent rau Charles Brady King ntawm Detroit, Michigan.
Leej twg invented jackhammers?
A jackhammer yog lub tshuab pneumatic lossis electro-mechanical uas sib txuas rau rauj ncaj qha nrog lub chisel. Nws tau tsim los ntawm William Mcreavy, uas tom qab ntawd muag patent rau Charles Brady King. Handheld jackhammers feem ntau yog siv los ntawm huab cua compressed, tab sis qee qhov kuj tau siv los ntawm hluav taws xob motors.
Vim li cas lawv thiaj hu nws ua tus jackhammer?
also jackhammer, "portable rock-drill worked by compressed air, " 1913, from jack (n.) + rauj (n.). Raws li kev qhia los ntawm 1947.
Yuav hnyav npaum li cas?
jackhammers hnyav npaum li cas? Jackhammers sib txawv ntawm qhov loj thiab qhov hnyav. Hluav taws xob jackhammers hnyav ncig 40 phaus, thaum qib kev lag luam, pneumatic jackhammers tuaj yeem hnyav dua 75 phaus.
Ntev npaum li cas koj tuaj yeem siv jackhammer?
Raws li piv txwv, raws li daim duab no, qhov nruab nrab Jackhammer yuav tsum tsis txhob siv rau ntau tshaj 40 feeb ib hnub los ntawm ib tus neeg siv. ELV thiab EAV sawv cev rau Tus Nqi Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Lij Tshaj Tawm thiab Tus Nqi Tshaj Tawm Tshaj Tawm. Qhov no txhais ua ib tus neeg ua haujlwm nyab xeeb siv lub jackhammer rau 8 teev ua haujlwm txhua hnub.
