Abstract: This invention relates to an apparatus for feeding pressurized fluid by a constant c. c. pump and a variable c. c. pump, both driven by a single motor.A valve actuated by a centrifugal governor ensures the feed of a jack adjusting the position of the member for adjusting the cubic capacity of the variable c. c. pump.One application is the drive of pumps of which the sum of the maximum powers is greater than the maximum power of the motor.

Abstract: A telescopic structure comprises an inner and an outer member telescopic relative to each other, and means for supporting and/or guiding one member relative to the other member, comprising a pair of wheels mounted on each member and positioned between the members, the wheels on one member bearing on parallel runways fixed to the other member, the runways each having an at least partly circular section with the peripheral surfaces of the wheels bearing on the runways being correspondingly toroidally shaped to have geometric projections in a plane perpendicular to the direction of extent of the runways extending parallel and perpendicular to the rotational axes of the wheels.

Abstract: This invention relates to a method of handling the driver's cab of a public works machine, said cab being mounted to pivot on the frame (turret) of the machine and this machine comprising a working attachment, mounted on said frame, whose form may undergo a modification.The pivoting axis of the cab is substantially perpendicular to the plane of deformation of the working attachment, a zone of the cab distinct from the one where the axis is located is coupled, via a sling, to the working attachment and the deformation of the working attachment is controlled so as to displace said coupling zone thus pivoting the cab as desired.One application of the present invention is the realization of a high power hydraulic shovel.

Abstract: A pressurized fluid supply apparatus comprises a closed circuit including a variable delivery pump, an open circuit including a pump, a fluid reservoir and a fluid cooler, and an engine for driving said pumps having an output shaft coupled to the drive shaft of said pumps, a flow-limiter being provided in the delivery conduit of said pump of said open circuit and including a restriction whose configuration is independent of the pressure of fluid in said delivery conduit upstream of said flow-limiter.