Abstract: The present invention relates to a vehicle equipped with wheels coupled to fluid motors, restrictions being placed on supply or exhaust conduits of the motors. According to the invention, the vehicle comprises front and rear wheels, each coupled to one of the motors, each motor being of a reversible type, while a restriction is placed on the supply conduit of each motor coupled to the rear wheels, another restriction being placed on the exhaust conduit of each motor coupled to the front wheels. One application of the invention is the production of a wheeled vehicle equipped with a simple and efficient anti-skid system for its wheels.

Abstract: The invention relates to a pressurized fluid mechanism comprising a plurality of pistons (14) and a plurality of different cylinder capacities. A particular cylinder capacity is selected by means of two identical slide valves (17, 18) which serve selectively to neutralize either a first overall cylinder capacity (45a) or a second overall cylinder capacity (45c), or both or neither of said first and second cylinder capacities. One application of the invention is to providing an efficient and compact motor which is cheap to produce.

Abstract: The invention relates to a braking device, constituted by a housing in which is housed a brake disc fixed in rotation with respect to the housing, a shaft mounted to rotate, a rotary brake disc, fast with the shaft, a first jack, constituting a pressurized fluid braking control member, and a second jack distinct and independent of the first jack, which defines, inside the housing, a brake-release chamber, to which is coupled an elastic safety braking member, the mobile element of the first jack and the piston of the second jack being stacked axially in that order from only one of the two ends of the alternate stack of the fixed and rotary brake discs. The mobile elements of the two jacks are each at least partly contained in the brake-release chamber which, furthermore, contains each fixed brake disc and 1 or each rotary brake disc. One application of the present invention is a multiple-effect brake of satisfactory compactness.

Abstract: This invention relates to a hydraulic mechanism having a cylinder block comprising cylinders, pistons mounted in these cylinders, and supporting rollers for abutment on a cam with respect to which the cylinder block is mounted to rotate. The mechanism for holding each roller in position with respect to a corresponding piston comprises two distinct supports which each abut on the inner surface of the cylinder, are maintained in position along the axis of the piston, have their angular orientation with respect to this axis constant and possess a face for abutment against an end face of the roller. One application of the invention is the manufacture of a compact engine.

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: 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: 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: 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: This invention relates to a public works machine equipped with a bucket unloading device. According to the invention, this device comprises an endless member mounted for movement or translation along the jib and comprising blades, a chute disposed under the jib capable of being swept by said blades and a bucket whose section is identical to that of said chute, the shoot-bucket assembly then being completely swept by the blades. The material contained in the bucket is pushed via the shoot onto a conveyer belt which evacuates it to the rear of the machine.

Abstract: The piston of a fluid ram is provided with an end of stroke braking means comprisng a pusher adapted to contact the end wall of the ram cylinder as the piston approaches the end wall to restrict the flow of fluid from the outlet chamber of the ram to an outlet part. As the ram moves nearer the end the pusher opens a valve in the piston to connect the inlet chamber of the ram to the outlet part.

Abstract: This invention relates to a bearing enabling a shaft to be pivotally mounted, constituted by a bearing body and by two half-bearings, the first half-bearing being fast with the bearing body, while the second half-bearing is mounted to slide in said body in a direction perpendicular to the plane defining the first half-bearing and a means for returning this second half-bearing into the configuration of effective holding of the shaft is interposed between said second half-bearing and the bearing body. The bearing surface of the second half-bearing is provided with a friction lining. One application of the present invention is the production of a cardan suspension in a grab bucket.

Abstract: This invention relates to a device for assembling a bucket on a frame comprising, in addition to said bucket, a zone of articulation of this bucket at a determined spot on the frame, disposed so that the resultant configuration enables the material to be loaded into the bucket and another zone of articulation of the bucket at another spot on the frame, disposed so that the other resultant configuration enables the material contained in the bucket to be unloaded. The changes in configuration are made by pins controlled by jacks and introduced selectively into orifices, the controls of the jacks being synchronized so as to permanently provoke the insertion of certain of the pins into the orifices of at least one of said two zones. One application of the present invention is the production of a loader bucket.

Abstract: This invention relates to a jib of a public works machine constituted by two elements, a piece for connecting said two elements, and removable means for locking the piece to the elements.The connecting piece is mounted on one element and comprises first holes disposed at the apex of a polygon; the other element comprises second holes separated from one another by distances equal to the length of the sides of the polygon; finally, when the jib is assembled, the connecting piece is fast with the first element via its axis of rotation and a removable pin introduced into a corresponding hole and in a special hole of said first element and fast with the second element via two removable pins introduced into corresponding holes.One application of this invention is the realization of a hydraulic shovel whose overall size is reduced for suitable road-transport.

Abstract: A braking system for the brake of a fluid motor including a jack for releasing the brake and two selectors for controlling the flow of working fluid to the jack. The first selector is responsive to the supply of fluid to the motor to place the jack in communication with a supply pipe and the second selector is responsive to pressure in a bleed pipe connected to the fluid supply to the motor to place the supply pipe in communication with a supply of working fluid under pressure.

Abstract: The present invention is directed to a supply circuit for a hydraulic jack employing two pumps in which a valve is positioned in a pipe which is branched to the delivery pipe of the first pump and is controlled by two jacks supplied by the fluid delivered by the second pump. A constrictor is positioned in the supply system for one of the jacks and another constrictor is placed in the discharge system for the two jacks with the invention being particularly applicable to achieving a stable control circuit for the load relief of the first pump.

Abstract: A fluid feed device comprising a constant cylinder capacity pump and at least one variable cylinder capacity pump driven from a single prime mover, the variable cylinder capacity pump being provided with a regulator for reducing its cylinder capacity as the feed pressure increases. The regulator is such as to reduce the power absorbed by the variable cylinder capacity pumps as the pressure increases by an amount equal to the increase in the power absorbed by the constant cylinder capacity pump such that the total power absorbed by the pumps remains constant and equal to the power of the prime mover.

Abstract: A hydraulic installation with means for storing energy produced by the prime mover during a rest period of the installation. Energy is stored by a fluid accumulator by suitable positioning of control valves during the reset period. Control of the valves is effected by a logic circuit responsive to pressure in the accumulator, pressure in the main feed conduit leading to the driven device, and the position of a feed conduit control valve.

Abstract: In a method of subordinating the orientation of a grab on a Public Works machine to the angle of rotation of the turret three directions are chosen, the first two being determined by the desired orientation of the grab in the loading and unloading zones, respectively, and the third passing through the axis of rotation of the turret 2, the angle of rotation of the turret starting from the third direction is measured and compared with the angle between a straight line, passing through the point of intersection of the first two directions and the axis of rotation of the turret, makes and the third direction, the desired angle of the grab with respect to the boom in the loading or unloading zones is determined and the angle that the grab actually makes with the boom is measured and compared with the appropriate desired angle, the results of this comparison being used to control rotation of the grab to reduce the difference to zero.

Abstract: A public works appliance comprises a frame, a working attachment coupled to the frame and a control cab. The control cab contains a single control station and is mounted for rotation about an axis fixed relative to the frame. The cab may, therefore, be disposed in a first position in which the field of vision of a driver in the cab enables him to see and control the operation of the working tool, and in a second position in which the field of vision of the driver in the cab is unobstructed by the working attachment so that the appliance may be displaced, for example, along a road at a high speed.

Abstract: This invention relates to a public works machine comprising a frame, a working attachment, a counterweight and auxiliary jib moving above the counterweight and coupled to the working attachment.This auxiliary jib is provided with a guide member for a flexible connection means, said member being disposed above the counterweight, whilst such a connection means connects the counterweight to that part of the working attachment which is movable with respect to the part directly coupled to the frame by abutting on the guide member, constituting a link for handling said counterweight.One application of the present invention is the providing of a high power hydraulic shovel with a dismountable counterweight.