发明授权
US4709492A Pushing apparatus, and methods of constructing and utilizing same 失效
推动装置及其构造和利用方法

Pushing apparatus, and methods of constructing and utilizing same
摘要:
A device for back scraping snow, earth, or other like substances which generally includes a truck having a concave snowplow blade mounted on its front. The blade has shoes provided on its backside, wedge shaped hinged connections mounted on the shoes, and a flat blade mounted pivotably on said wedge brackets. When the flat blade is brought in contact with snow to be scraped and the snowplow blade is moved in a backwardly direction, the snow to be scraped is moved by the flat blade.
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