Patent ID: 6863147

Claim:
A hydrostatic power steering device comprising a source of pressurized fluid, a cylindrical distributor ( 100 , 200 ) an outer barrel and an inner spindle of which are connected elastically together, the spindle ( 200 ), is connected to the steering wheel; the distributor being arranged to assume a central position, the so-called neutral position, in which it directly short-circuits, to discharge, the fluid originating from the source of pressurized fluid, and two positions, symmetrical about the central position, in which the distributor, via a dispenser ( 400 ) the rotor of which is rigidly connected to the steering wheel shaft and to the spindle, feeds the fluid to one and respectively to the other of chambers ( 301 ′, 302 ′) of a hydraulic actuator ( 800 ) connected to the steering wheel, characterised by comprising an auxiliary feed conduit ( 613 ) for feeding the pressurized fluid to the cylindrical distributor; at least one slide valve ( 700 ) operable by the driver to feed said auxiliary feed conduit when desired; a barrel locking system ( 402 ) operated by the pressure of the fluid present in said auxiliary feed conduit; holes and grooves in the outer barrel and in the spindle to directly connect said auxiliary feed conduit to one or other of the chambers ( 301 ′, 302 ′) of the actuator without passing through the dispenser rotor.