Abstract: The invention relates to a power arm made of a bent, welded structure defined by two lateral plates and by an upper plate and a lower plate welded to the lateral plates and comprising a box having an upper cap and a lower base forming a cross piece of width equal to the spacing of the lateral plates, disposed between these plates in the zone of their elbow and welded to said plates. The cap and the case join, forming two angles, along two lines which pass substantially through the neutral axis of each lateral plate. The invention finds particular application in the manufacture of the boom of a hydraulically operated shovel.

Abstract: The invention relates to an engine with radial pistons 9, which are coupled to elastic return means 25 for free-wheeling operation.Said elastic means are constituted by springs 25 whose number is equal to that of the pistons and by levers 21 mounted to pivot, each with respect to a piston 9, about an axis parallel to the axis of rotation 6 of the cylinder block 7, and equal in number to the springs, whereas each spring 25 is coupled to two levers 21, each lever constituting the bond for two springs 25.An application is the production of a hydraulic engine which is reliable and of simple design.

Abstract: The invention relates to a mobile machine including a frame provided with a stabilizer comprising a connecting rod articulated on the frame, a shoe articulated on the connecting rod and a member for adjusting the position of the shoe with respect to the connecting rod and frame. The invention further includes two stops for limiting the rotation of the connecting rod with respect to the frame.

Abstract: The invention relates to a device for the rotary assembly of a member controlled by pressurized fluid, comprising a body presenting first and second shoulders opposite which are disposed first and second shoulders, with which is provided the member comprising an inner pipe opening into a groove disposed between this member and the body into which a main conduit, made in the body, opens out, while an inner conduit, made in the body, opens into the first shoulder of the body and is connected to the conduit, the pressure of the fluid contained in the conduit being capable of having such a value that the resultant thrust which is exerted on the first shoulder of the member has for its effect to cause the second shoulders to abut firmly on one another, effecting the locking of elements. One application of the invention is the production of a drag bucket with monitored rotation.

Abstract: The invention relates to a ram comprising a piston rod in two parts mounted for relative rotation.A first part extends out of the cylinder, beyond each of the heads, while the second part extends out of the cylinder only beyond one head, namely the upper one, and comprises two axial shoulders directed in opposite directions, located at the two ends of this second part and each cooperating with a shoulder, fast with the first part, corresponding to the maintenance of a fixed relative axial position between the two parts, and two radial bearing surfaces located at the two ends of the second part and cooperating with two radial bearing surfaces fast with the first part, corresponding to the centering of the two parts. The present invention is particularly applied to a rotatable clam-shell bucket.

Abstract: The present invention relates to a method for determining the locations of the two hydraulic jacks for controlling an assembly of two pivoted arms, the first arm, called boom or jib, pivoted on the frame of a public works machine, such as a loader or a hydraulic shovel, and the second arm, called balance beam, pivoted on the first arm, while a bucket, adapted to rest on the ground during loading, is coupled to said balance beam, each of said two jacks is coupled between the frame and the balance beam, at least one of the axes of coupling of one of the jacks being separate from the axis of coupling of the other jack on the same element--frame or balance beam--and the instantaneous centers of rotation of the bucket, corresponding respectively to the functioning of each of the control jacks when the bucket is near the ground, are chosen to be on the longitudinal axis of the boom, wherein the first instantaneous center of rotation is chosen to be near the ground, the second instantaneous center of rotation is cho

Abstract: An improvement to large container handlers having a transportable platform. A powered positionable support arm is pivotally mounted on one end to the platform for vertical rotation. A L-shaped arm is pivotally mounted from the other end of the support arm to be vertically rotatable. A container gripping device is suspended from the L-shaped arm. In one embodiment, the support arm is mounted to move the L-shaped arm vertically as the support arm is rotated so as to, thereby, raise and lower a container without sidewards movement.

Abstract: A control system for stopping a hydraulic motor in a predetermined position comprises a valve connected in parallel across the motor, the valve having a closed position and an open position in which flow is via a throttle orifice. When the motor is being driven normally the valve is closed. When the main control regulator for the motor is moved to stop the motor, the valve is automatically opened to allow limited fluid flow through the motor during a slowing down phase. A detector senses when the motor is a predetermined distance from its desired stopping position, and moves the valve to its closed position. Overload valves are provided to prevent overpressures.

Abstract: A fluid supply circuit for supplying three motors includes means for sequentially connecting two of the motors to the supply conduit of the third motor as the pressure in the supply conduit rises through first and second threshold levels. The circuit includes a manual override for suppressing the automatic sequential action. The circuit is applied to the control of the booms and bucket of a hydraulic excavator, and provides for semi-automatic digging.

Abstract: Apparatus for fixing and driving a displacement member (such as a wheel) of a vehicle is disclosed. In particular, an axle journal is coupled to the vehicle chassis. At least one rotating bearing surface is disposed between the displacement member and the axle journal for the rotatable assembly of the displacement member. A drive motor is provided having a stator which is removably attached to the axle journal and a rotor which is removably mounted to rotate with respect to the stator by means of rotating bearings in contact with the bearing surface. Since the rotating bearings of the motor only contact the removable bearing surface, the motor can be dismantled while maintaining the displacement member in place on the axle journal.

Abstract: A hydraulic mechanism, e.g. a pump or motor, comprises a plurality of cylinders and pistons and a piston-displacement selector which is provided with blind helical grooves for controlling connection of the cylinders to the main fluid supply.

Abstract: This invention relates to a detector for detecting the relative position of two members, said detector being constituted by a reference mark made on a first member, by a detection member securely connected to the second member and influenced by the coincidence of position of the reference mark with itself, corresponding to said relative position. The reference mark is of substantially punctual type, distinct from other possible reference marks and separated from said other reference marks. One application of the present invention is the detection of the end of stroke of the piston of a jack.

Abstract: Calibrated pressure relief valve constituted by a body, a closure member, a piston which slides tightly in a bore and defines in the body an exhaust chamber and an adjustment chamber, a member for returning the closure member, interposed between said latter and the piston, and by a means for adjusting the position of the piston with respect to the body, on which the piston abuts and which comprises a source of incompressible fluid, of which the delivery conduit is connected to said adjustment chamber, said pressure relief valve further comprising a non-return valve disposed in the conduit connecting the source of incompressible fluid to the adjustment chamber and fixed on the body of the valve. One application of the present invention is the provision of a station for the centralized remote adjustment of the settings of the various valves of a circuit, for example the driver's cab of a hydraulic loading shovel.

Abstract: Endless track, particularly for public works machine, comprising a chain having links on which tiles are fixed by means of bolts, while at least one anchoring member, separate from the bolts, extends perpendicularly to the face of contact of a tile and its link and penetrates into a housing provided in each of these two elements, wherein the anchoring member is constituted by a solid element formed by a disc having a tenon on one of its faces.

Abstract: A chassis for a vehicle has two parallel longitudinal side members each connected at two spaced locations to a transverse frame; the transverse frame is connected at two spaced locations to each longitudinal side member by a swivel joint at each respective location with the swivel joints on each side member having coextensive axes located substantially in line with each other and parallel to the longitudinal axes of the side member and by two tie-rods each pivoted at one end on the transverse frame and on an opposite end to the longitudinal side member.

Abstract: Stabilization apparatus for a tower crane or other mobile equipment includes several telescopic structures.Each structure includes an inner telescopic part and an outer telescopic part and an actuator for moving the parts to a fully extended position. The inner telescopic part carries a plate which is applied in use to the ground and is controlled by a secondary telescopic structure.When the main telescopic structure is extended there is some sag so that a detector intended to indicate achievement of the extended position is not actuated. When the secondary telescopic structure is actuated and the plate is in firm contact with the ground the sag is corrected and the detector is actuated.

Abstract: A flow regulation device includes a main regulator connected to the exhaust pipe and delivery pipe of a fluid motor having a valve controlled by the feed pressure to the motor for varying flow permitted from the motor; flow from the valving means passes through a restriction with pressure between the valve and the restriction tending to close the valve. A supplemental valve opens to shunt flow around the restriction following opening of the first valve with the invention being used for the functional control of a winch.

Abstract: A servo-operated fluid flow control valve includes a valve body housing a main valve which defines with the body an inlet chamber, an exhaust chamber, and a control chamber. An auxiliary valve is interposed between the control and exhaust chambers and is movable relative to the main valve by a jack controlled by a regulator. The arrangement is such that when the auxiliary valve is closed, the inlet and control chambers are in communication, and when the auxiliary valve is open, the control and exhaust chambers are in communication while the inlet and control chambers are isolated from each other.

Abstract: Public works machine comprising a bucket mounted to pivot on the end of a boom, a device for adjusting the relative position of said bucket with respect to said boom, a ripper tooth, which is mounted to pivot on the end of the boom, while said position-adjusting device is coupled between the boom and the tooth, two selective immobilization devices, one for immobilizing the bucket with respect to the boom in a configuration where said bucket is not in operation, in which the penetrating element of this bucket is orientated towards the boom and disposed near said latter, the other for immobilizing the bucket with respect to the tooth in a configuration where said tooth is not in operation, in which said tooth is joined to the outer face of the bottom of the bucket, the distance separating the end of the tooth from the pivot axis being at the most equal to that separating the penetrating element of the bucket from said pivot axis.

Abstract: This invention relates to a self-propelling construction machine comprising a frame provided with at least two groups of ground engaging members disposed and spaced longitudinally on said frame, either the front or rear end of the frame being provided with means for coupling to a tractor or articulated vehicle. The group of ground engaging members disposed near the end with the coupling means comprises a device for adjusting their height with respect to the frame, enabling them to retract away from the ground when said machine is coupled to the tractor, whereas the ground engaging members other than those disposed near the end with the coupling means are constituted by a wheel assembly which is irremovable whilst the machine is functioning. One application of the present invention is the production of a travelling crane.