Abstract: The invention relates to a loader/excavator-type heavy-construction machine comprising a hydraulic system which powers one or more hydraulic actuators. The aforementioned hydraulic system is equipped with a variable-delivery pump which can operate in two different modes, namely full power mode for use as an excavator and reduced power mode for use as a loader. The invention is characterized in that it also comprises a temperature sensor which is used to determine the temperature of the oil in the hydraulic system and means of automatically switching the operation of the pump from full power mode to reduced power mode when the oil temperature exceeds a pre-determined threshold.

Abstract: A loader-type heavy construction machine has a chassis and work equipment. The work equipment includes two parallel arms articulated relative to the frame, a bucket articulated relative to the arms, a set of link rods forming, with a portion of the bucket and of the arms, a deformable parallelogram, and a bucket actuator capable of being controlled to cause deformation of the deformable parallelogram so as to orient the bucket with respect to the arms. A cam is moved by a connecting bar connected at one end to the deformable parallelogram so that the position of the cam is dependent on the orientation of the bucket with respect to the chassis. The cam interfaces with an hydraulic circuit to ensure that the bucket is maintained in a position preventing it from accidentally tipping over backwards, regardless of commands exerted on an hydraulic manipulator by a driver of the machine.

Abstract: A loader-type heavy construction machine has a chassis and work equipment. The work equipment includes two parallel arms articulated relative to the frame, a bucket articulated relative to the arms, a set of link rods forming, with a portion of the bucket and of the arms, a deformable parallelogram, and a bucket actuator capable of being controlled to cause deformation of the deformable parallelogram so as to orient the bucket with respect to the arms. A cam is moved by a connecting bar connected at one end to the deformable parallelogram so that the position of the cam is dependent on the orientation of the bucket with respect to the chassis. The cam interfaces with an hydraulic circuit to ensure that the bucket is maintained in a position preventing it from accidentally tipping over backwards, regardless of commands exerted on an hydraulic manipulator by a driver of the machine.

Abstract: A multipurpose engineering construction machine of the loader/shovel type has a mobile chassis centrally mounting a driving and control station. The chassis supports a loader assembly at the front, and a shovel assembly at the rear. These assemblies are capable of being controlled independently of one another via a hydraulic circuit selectively feeding a number of directional control valves that can be actuated by a manipulator and that control hydraulic actuators operating components of each assembly. The direction control valves are grouped together as a single module mounted transversely on the chassis between the rear axle and a frame supporting the shovel assembly. Hydraulic fluid supply is provided via a variable-throughput pump supplying a priority valve associated with the module. Distribution of fluid to each directional control valve is performed with a compensation balance allowing the deliveries to be adjusted in stages.

Abstract: Civil engineering apparatus that includes a turret mounted upon the chassis of a motor vehicle. A boom is pivotally mounted in the turret and is connected to a tool stick by a boom tip. Articulating members are mounted on either end of the boom stick so that each end of the boom stick can be pivotally displaced in two perpendicular planes.