| 摘要 |
The invention relates to rotary cutting blades with articulated knives, intended to reapers, lawn mowers, tree-dozers, etc., used particularly on dangerous grounds, i.e. is grounds which can hide many obstacles such as stones, pebbles, rocks, pickets, land stones, wrecks, etc. The combined effects of wear and violent shocks may cause the dislocation of the blade, particularly the knives with respect to their rotating support. Then, a violent projection of debris may occur. The invention prevents said dislocations, regardless of the wear of the assembly and the violence of the shocks, by suppressing the known causes of rupture. The invention is a general inventive concept which combines the conjugated effects of a general cohesive structure without mechanical assemblies, therefore without protuberances, of a knife shape adapted to said structure and tolerant to shocks, of the use, for the knives, of a specially treated steel which makes said structure and said shape perfectly useable and efficient.
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