| 摘要 |
The coupling is characterized in that the guiding and support of the gullet over a zone close to the edge of the scoop (shovel) which said gullet is to protect is achieved by the combination of three inclined planes, two of them parallel to the insertion of the gullet, intended to establish contact with a notch with a shape matching the gullet, and the third arranged transversely with respect to the first ones and intended to receive one of the sides of a transverse retention key. The three inclined planes are produced in the attached piece welded in the vicinity of the edge of the scoop to be protected. <IMAGE>
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