| 摘要 |
The invention concerns a loader-type heavy-construction machine (1), comprising a frame (5) and a working equipment (2) which includes: two parallel arms (3) articulated relative to the frame (5); a bucket (15) articulated relative to the arms (3); an assembly of link rods (20, 21) forming, with a portion of the bucket (15) and of the arms (3), a deformable parallelogram; a bucket actuator capable of being controlled to cause deformation of the deformable parallelogram so as to ensure orientation of the bucket (15) relative to the arms (3). Said machine also comprises means including a hydraulic drive circuit and a cam mechanism (35) driven by a tie rod (30) linked through one end to the deformable parallelogram and so designed that the orientation of the bucket (15) is maintained in a position preventing it from accidentally tipping over backwards, whatever the controls exerted by the driver on the manipulator (58).
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