Abstract: A circuit for hydrostatically operable devices, especially hydraulic dredges, with at least two working circuits each of which comprises a plurality of hydraulic cylinders and/or hydraulic motors as well as a hydraulic pump while, depending on the requirement, the delivery of the pertaining hydraulic pump is conveyed to each hydraulic cylinder or hydraulic motor and while by means of a plurality of tie lines the deliveries of the remaining hydraulic pumps are selectively conveyed to one of two or more selected hydraulic cylinders or hydraulic motors. The deliveries of the hydraulic pumps flow to the tank after having passed through the control valves associated with the hydraulic cylinders and controlling each of the hydraulic pumps.

Abstract: Articulation of an excavator shovel at a pivot point arranged at the free end of the stick. A cap is mounted on the free end of the stick, the cap facing the rear wall of the shovel. The surface of the cap defines a radius with a center point at the pivot point of the shovel. A scraper plate with a width corresponding to the width of the stick on the rear wall of the shovel facing the stick is arranged parallel to the upper edge of the bearing bracket and cooperates with the cap so that only a clearance which assures free passage is present between the cap and the scraper plate. The imaginary extension of the scraper plate intersects the radius of the cap at a point located on the upper flange of the stick.

Abstract: A crane comprising a ground jib, a sliding jib telescopically engaged with the ground jib and movable in a telescoping direction, and a head jib pivotally mounted to the sliding jib. A catch hook is pivotally mounted to the head jib on a pivot axis which extends in the telescoping direction of the sliding jib and a catch member is connected to the ground jib in a position to engage with the catch hook when the sliding jib is protracted into the ground jib and when the head jib is pivoted toward the ground jib. The catch member extends in the telescoping direction so that the catch hook is disengaged from the catch member when the sliding jib is extended with respect to the ground jib. A method is also disclosed for stowing the head jib of the crane.

Abstract: Bottom plates for walking mechanisms for the movement of heavy loads, which bottom plates are connected by means of connection pieces. The bottom plates are elastically connected with connection pieces, the latter being formed as open profiles.

Abstract: A sealing for back and forth moving machine elements, particularly for the sealing of rods for hydraulic cylinders, with a seal which seals against the housing as well as against the axially back and forth moving machine part, a preceding protection element which is arranged between the seal and the pressurized chamber of the cylinder, and a stripper, which stripper is turned toward the atmosphere. The preceding protection element is provided with a lip, the lip being directed toward the oil pressurized chamber, which lip touches the back and forth moving piston rod and has openings, which openings produce a connection between the pressurized oil chamber and that oil chamber which is formed between the preceding protection element and the lip seal.

Abstract: A rotary drum for the heat treatment of bulk goods, with the drum being mounted by means of thrust rings. Wedges are arranged on the outer periphery of the shell of the rotary drum, the wedges being disposed opposite to one another at a spacing corresponding approximately to the width of the thrust ring. Those inclined surfaces of the wedges which inclined surfaces face toward each other cooperate with insert pieces, the insert pieces being fastened on the thrust ring and being provided with counterwedge surfaces. The inclined surfaces of the wedges and the counterwedge surfaces are arranged on the outer periphery of the shell of the rotary drum successively flip symmetrically.

Abstract: An unloading device for equipment such as ships, bunkers, storage yards or the like comprises an elevator which has a substantially vertical supporting structure with a lower pickup end and an upper delivery end and a conveyor mounted on the structure with an elevator section for conveying material substantially vertical along the support structure. The lower end of the support structure engages into a rotatable bucket wheel which is mounted on a supporting structure. The bucket wheel is mounted in an inclined position relative to the supporting structure preferably at an angle of 45.degree. to the vertical axis of the supporting structure.

Abstract: Rotary connection having a housing which is provided with annular ducts and with feed bores for pressurized oil and non-pressurized oil and having a piston-shaped inner part arranged in the housing, the inner part being formed with bores and with grooves on its periphery, for the passage of high-pressure oil and practically non-pressurized hydraulic oil. By means of a valve piston which can be acted-on at both end surfaces thereof with pressurized oil, lubricating ducts are connected, depending upon the switched position of the valve piston, via a central longitudinal bore provided with transverse bores, with the respective annular duct which at the time is not applied with pressurized oil.

Abstract: Tensioning device for tensioning of hydraulic flexible tubes on telescopic lift mast assemblies of fork lift trucks with the flexible tubes being turned-around over a pulley which is rotatably mounted on the stationary outer upright and an additional pulley which is rotatably mounted on the sliding inner upright. A holder is engaged by a spring, the holder being guided on the stationary outer upright in a guide, the holder carrying a rotatable pulley.

Abstract: Escalator with driver device for carrying of transportation carts on the escalator steps. The transportation carts are secured against rolling down the escalator steps by a carrying and abutment device, which device is arranged on both sides of the transportation carts along the balustrades.

Abstract: An electronically controlled pipe fracture safety device for operating devices which are fed by a hydraulic pump and which are actuated by a control slide value by means of hydraulic cylinders. Control lines branch off from lines which lead from the hydraulic pump via a control slide valve to the hydraulic cylinders, the control lines feeding the hydraulic medium to a differential flow monitor, on the piston of which a permanent magnet is fastened. The latter, by means of a reed contact as a result of a pressure difference existing between the control lines, which pressure difference is brought about by damage or fracture of a line, produces a signal in the NOR gate, the latter forming the input of a scoring logic. This signal retransmits a self-holding signal to NAND-gates which form a flip-flop. The self-holding signal causes deenergization of a relay and consequently an interruption of the current flow to the control slide valve and brings about the locking position of the latter.

Abstract: A driving unit for driving the circulating step band of escalators which is arranged inwardly of the step band and includes an electric motor, a transmission and a hand rail drive. The output shaft of the transmission simultaneously serves as main drive shaft for the step band. The electric notor has a housing which is formed by a rotor which is journalled in an overhung manner on the input shaft of the transmission. The torque of the transmission is absorbed through the intervention of a torque support by a handrail drive shaft which is driven by a chain or a gear transmission.

Abstract: A transportation system includes pallet cars coupled with one another; the pallet cars being for the positive non-slipping transportation of baggage conveyor cars for escalators. On the lower side of the pallet cars, arc-shaped drivers are pivotably mounted about one of the carrying axles constituting a pivot point, by means of a bracket. The drivers are supported on a track via a roller secured at a pivot point on the driver such that during the transportation operation the driver projects through a slot in the pallet car and engages in back of a catch which is secured at the bottom of the baggage conveyor car. Shortly before reaching the horizontal part of the transportation system the driver disengages from the catch of the baggage conveyor car.

Abstract: A rapid-change device for attachments on earth moving machines for connection between a lift chassis, which is hydraulically actuated from the carrier vehicle, and an attachment implement, for instance a loading shovel, by means of holding claws and locking latches. The locking latches are pivotally mounted on the outer periphery of hubs which are fixed on stay arms. The lift arms of the lift chassis are coaxially pivotally mounted in bores of the hubs. The stay arms are provided with holding claws having semicircular recesses which are adapted to receive holding bolts of the loading shovel. The center points of the semicircular recesses of the holding claws and the pivot points of the locking latches are coordinated with respect to each other such that the line of action of the reaction forces which are introduced by the loading shovel extends through the pivot points for the locking latches and through the center points of the recesses or above the center points of the recesses.

Abstract: A steering gear with steering drop arm, steering tie rod and steering gear connecting tie rod for a vehicle, which is drivable on wheels on the road and terrain, with a steering mechanism which is actuated selectively hydraulically supported mechanically or purely hydraulically by means of hydraulic cylinders and electromagnetic valves, whereby changing from the hydraulically supported system to the purely hydraulically operating system is by means of a selective connection of a universal shaft, which is connected with the steering wheel, with one of the two systems which serve the actuation of the steering mechanism. A hydraulic pump, driven by a drive motor, and acting on both systems, is connected with a first control valve via a line, a flow control- and pressure limit- valve and a line. On the one hand a line leads from the first control valve to a steering transmission, the latter being actuated by the steering gear by means of universal shaft.

Abstract: A retainer for the releaseable securing of a tooth tip of a digger tooth on a holder, the tooth tip being provided with a sleeve, and the holder engaging in the sleeve and being rigidly connected with the digger edge of the shovel bucket. The retainer is arranged in a holder opening extending parallel to the cutter edge of the tooth tip and in the longitudinal center line of the tooth, the retainer being made of two metal formed parts and a rubber element arranged between the two metal formed parts, the rubber element being stressed on compression. The retainer in the installed assembled condition on one side comes into contact on the surfaces of the tooth tip openings which face toward the cutter edge and on the other side comes into engagement on the surfaces of a recess arranged in the holder which face away from the cutter edge.

Abstract: A transporter conveyor system, integrated with an escalator, for the transportation of pieces of baggage from one conveying plane to a different conveying plane. Parallel to the escalator for the transportation of people there is arranged an endless baggage conveyor belt which is provided with balustrades, which conveyor belt is driven synchronously with the escalator.

Abstract: A caterpillar-type travelling mechanism for vehicles provided with a self-propelled drive, particularly hydraulic dredges, with a drive sprocket wheel, a guide wheel for the guidance of the caterpillar chain and chain links connected with one another by bolts. Cam-shaped teeth are arranged on the drive sprocket wheel in its longitudinal center plane, the teeth being provided on the sides which point toward one another with planar surfaces. The drive sprocket wheel is provided on its outer periphery with two running rims for the chain links, the rims being arranged on both sides of the teeth. The cam-like teeth are arranged on the periphery of a wheel flange, the latter on both sides being provided with inclined surfaces for guiding the chain links. The travelling mechanism plates of the chain links, which plates are formed as double-stud plates, are made of one piece with a two-sided cam arranged centrally in the chain link.

Abstract: A cooling container vessel, comprises a vessel hull with spaced apart bulkheads which define a storage space therebetween and which includes substantially vertically arranged guide frames disposed in the space at spaced locations from the bulkheads alongside a vertically elongated manifold for the supply of cooling air. A plurality of horizontally extending double-walled cargo supporting structures are engaged with the frames and are supported thereby in a horizontal position. The double-walled cargo supporting structures are provided with an interior cavity which is supplied with cooling air by a connection carried thereby which may be engaged with a connection to the manifold and include at least one wall which has openings for the flow of cooling air into the cavity of the double-walled supporting structures and outwardly through the openings in the wall thereof.

Abstract: A contact free device for limiting the relative movement of hydraulically actuated members in which the device includes a proximity switch actuated at each limit position of the members and which interrupts the supply of hydraulic actuating fluid to the members. The supply of fluid to the members is resumed when movement of the members relatively away from the respective limit position is initiated.