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power shovel
A power shovel (also stripping shovel or front shovel or electric mining shovel) is a bucket-equipped machine, usually electrically powered, used for digging and loading earth or fragmented rock and for mineral extraction.〔(US Department of the Treasury, IRS: Appendix I - Glossary of Mining Terms )〕
==Design==
Shovels normally consist of a revolving deck with a power plant, driving and controlling mechanisms, usually a counterweight, and a front attachment, such as a crane ("boom") which supports a handle ("dipper" or "dipper stick") with a digger ("bucket") at the end. "Dipper" is also sometimes used to refer to the handle and digger combined. The machinery is mounted on a base platform with tracks or wheels.〔(Encyclopædia Britannica, Power Shovel )〕 Modern bucket capacities range from 8 m3 to nearly 80 m3.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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