| 摘要 |
A cement resurfacing machine for roughening or scarifying a cement floor or the like, wherein wheels ride along the cement, and the machine has a carriage frame that is periodically raised to permit the machine to be advanced. This carriage frame is provided with a lower horizontal impact plate, the latter having a grid of pointed chisels on its underneath surface, and a vertically movable platform is periodically raised and then dropped against the impact plate so as to drive the chisels into the cement.
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