Abstract: The device relates to an autogenous rotor that rotates about an axis of rotation, which rotor is provided with at least one guide member for accelerating material, which guide member is associated with a chamber member where an autogenous bed of material builds up, with the aid of which guide member material is guided into a spiral path in the direction of the chamber member where the accelerated material impinges on the autogenous bed at a predetermined impingement location, after which the material moves from the impingement location along the autogenous bed in the direction of the tip, under the influence of centrifugal force, where the material is propelled outwards from the rotor.

Abstract: The method and the device relate to a rotor which rotates about a vertical axis and is fitted in a streamlined mill in which the stationary collision surface is constructed as a smooth (cylindrical) collision ring and is arranged an adequate distance away from the rotor and thus makes it possible to allow the material to collide, optionally several times, in an essentially completely deterministic manner, or at an essentially predetermined collision location, at an essentially predetermined collision velocity and at an essentially predetermined collision angle; by which a high probability of breakage—and thus the degree of comminution—is achieved, the energy consumption is reduced, wear is restricted and a crushed product is produced which has a regular grain size distribution, a restricted amount of undersize and oversize and a very good cubic grain configuration, the effect—i.e.

Abstract: A synchrocrusher for making a material collide in which the rotor is designed with a symmetric configuration. The rotor contains equal numbers of respectively forward and backward directed guide members and co-rotating impact members which are arranged, as synchronized pairs, in each direction of rotation. The pairs are circumferentially disposed uniformly at equal angural distances around the axis of rotation with the forward and backward directed configurations mirror imaged to each other. By combining or joining together pairs of respective forward and backward directed guide and co-rotating impact members, in respective guide and impact combinations and guide and impacts units, a supersymmetry configuration is achieved, which allows for many interesting synchrorotor configurations.

Abstract: The invention relates to the field of the acceleration of material with the aid of centrifugal force, with the aim of causing the accelerated grains or particles to collide at such a speed that they break. According to a known technique, the material can be introduced into the central chamber of a rotor and accelerated along guide elements, after which the material is propelled outwards in all directions. The invention provides a method and installation which makes it possible to propel the material outwards from the rotor along one or more streams, the flow regions which the material describes being essentially in a predetermined, fixed location. This makes it possible to allow the material to impinge essentially free from interference on one or more stationary impact elements which are arranged around the rotor. It is also possible to distribute or to spread the material from the rotor in one or more predetermined directions.

Abstract: Bucket dredger, comprising: a swivelling ladder connected to a vessel, a driven upper wheel at the top end and a polygonal lower wheel (7) at the lower end of the ladder, one or more endless chains (6) which are guided along both wheels, and buckets (9) connected to the shackles (8) of these chains (6). For receiving the lateral force exerted on a bucket the bottom wall (12) of each bucket (9) is provided with two ribs (15) extending downwardly, which extend substantially parallel to the side walls (14) of the bucket and which, in the assembled state of the bucket, extend adjacent the chains (6) and between the chains and upright edges (16) placed on the lower wheel (7). The ribs (15) can extend along the length of two shackles (8).

Abstract: The invention relates to a method for directly and multiply making material collide in an essentially deterministic manner, the material being guided by a rotating guide member, from a central feed, along a guide face and to a delivery end, in such a manner, that the material leaves the guide member, from an essentially predetermined take-off location, at an essentially predetermined take-off angle and at a take-off velocity which can be selected with the aid of the angular velocity, with the instantaneous angle (.theta.

Abstract: Device for driving a tool (4) positioned on a pivotable part (2). The device comprises a combustion engine (5) or the like which is arranged stationary, such that the extension of the motor drive shaft (6) is perpendicular to and crosses the pivot axis (22) of the pivotable parts (2). The motor drive shaft drives a transmission shaft (26) by means of a bevel gear transmission (15, 16, 17). The transmission shaft is supported by the pivotable part (2) in such a way that the extension of the axis (36) of the transmission shaft is also perpendicular to and crosses the pivot axis (22). The wheel (16) that is located between the wheel (15) which is directly driven by the motor drive shaft (6) and the wheel (17) on the transmission shaft (26) has been mounted on a wheel shaft (18), the axis (21) of which coincides with the pivot axis (22) of the pivotable part (2).

Abstract: Method for driving a hydraulic submerged tool whereby the hydraulic pressure energy is generated in a submerged power converter, being driven by pressurized surrounding water which after the energy transfer is exhausted into the surrounding water, said power converter consisting of one or more work cylinders (1, 2), each by means of a floating piston (3, 4) being divided in a space (5, 6) filled with the pressurized surrounding water and a space (7, 8), filled with a hydraulic work medium, switching means (17, 18) being provided, for alternately connecting said space (5, 6) either to a feed conduct (13) for pressurized surrounding water, or to an exhaust (14).

Abstract: Shaft seal consisting of an annular body of elastic material, comprising a fastening flange (1;12), a substantially axially extending flexible hinge portion (6;13) and a sealing lip (7;14). The fastening flange, hinge portion and sealing ring (5) form a single piece, and the sealing ring (7;14) has a cylindrical contact surface with the shaft extending over substantially the entire length of the sealing ring. This length is sufficient to receive one or more tensioning elements (10,11; 15,16) of an operative width to guide the sealing ring concentrically on the shaft over its entire axial length.

Abstract: Centrifugal pump, in particular dredging pump for fluids containing abrasive solids and at times larger pieces, having an impeller closed at its two sides, which impeller is journalled at its two sides directly in the pump housing or extensions of the housing, without making use of separate bearing blocks; at the suction side of the impeller the bearing surface is formed on the outside of an interchangeable suction pipe stub (65) about 0.2-1.0 m or more in inside diameter. At the drive side a corresponding bearing structure (66, 662), fitted with axial bearings (663, 661) is used, all radial and axial bearings being fresh water lubricated and of purposely simple, interchangeable design. Against the closed side walls (61, 63) of the impeller, lip-type water lubricated seals are disposed in the vicinity of the outer diameter of the impeller. The pump housing is a welded substantially concentric cylindrical structure.

Abstract: Device for withdrawing a pile or the like which has been driven into the soil by a ram device which can perform blows downwardly and upwardly and which in upward direction has a lost-motion connection with the pile, which lost motion for efficient withdrawal is removed by the extension of hydraulic cylinders.

Abstract: The invention relates to the rapid exchange of a detachably fastened part such as the suction head (3) of the suction pipe (2) of a hopper suction dredge (1) or a part of the suction head by a rapid-action coupling (7,8) and by a device (10,12,13,14,15) on deck (1) which can grip the part (3) while it is still fastened, can remove it after uncoupling and move the other part (16) towards the coupling (7,8) which device preferably comprises a number of arms (12,13) in fixed position relative to one another and rotatable about a horizontal axis (11) each arm (12,13) having a device (14,15) for carrying and releasing a suction head (3,16).

Abstract: A hopper vessel for storing bulk material such as dredged material, has one or more holds. The holds in their bottom are provided with trap doors that open by moving downwardly below the bottom of the vessel. In shallow water, there is the risk that these trap doors, when moved downwardly, will contact the bottom or the material that is deposited from the hopper vessel on the bottom. Therefore, some of the trap doors in the hold are at a higher level in the closed position than the other trap doors. To discharge material, the higher trap doors are opened first; and after enough material has been discharged that the vessel rises sufficiently high in the water, only then are the lower trap doors moved to open position to complete the discharge of the material. The higher trap doors are provided at the ends of the hold. This allows adjusting the angle of the vessel if the bottom of the body of water is sloped.

Abstract: Suction pipe with trailing head for a trailing suction dredger, the pipe being provided at its lower end with a connection piece of the trailing head in which the essentially rectangular throughflow opening of the trailing head passes into the circular cross section of the pipe. A replaceable endpiece or trailing head part, which forms the suction aperture or suction slit, is or can be detachably fixed at the side facing the connection piece by a quick action coupling to the connection piece in such a way that it rotates about a horizontal cross-shaft.

Abstract: System for detecting the forming of depot inside a transport channel for transporting particles in a light transparent carrier fluid, comprising a light transmitter, a light receiver, a bifurcated glass fibre cable of which an end is installed in the wall of a transport channel. One branch of the cable is coupled to the light transmitter and the other branch is coupled to the light receiver, and the output of the light receiver is connected to a discriminator circuit comprising a converter for converting the effective ac voltage component in the received signal into a dc voltage component and a comparator in which the dc voltage signal is compared with a predetermined threshold signal, which discriminator circuit is coupled to a visual indicator unit.

Abstract: The invention relates to an apparatus for removing oil from water, comprising a horizontal roller cooperating with a scraper blade as well as a receiving tray, the improvement being that the roller has its upper surface at the level of the water surface and is placed above the receiving tray and that between roller and the suction pump side of the receiving tray a grate has been placed, which cuts the collected oil into dischargeable pieces.

Abstract: Method and apparatus for the measurement of fluid flow velocities for instance in a slurry transport conduit, in which pulse signals are sent through the fluid by pairs of transmitting and receiving transducers, the pulses having such time separation that standing waves caused by reflection fade out within the time separation, and using side band techniques and correlation techniques.

Abstract: Hopper barge comprising one or more cargo spaces and a series of discharge openings in the bottom of the hold. Each opening comprises a bottom flap which in the downwards displaced position realizes a connection between the hold through the respective discharge opening to the water outside the barge. The barge further comprises a suction channel extending in the longitudinal direction of the barge whereby the bottom flaps each have at least one wall assuring the continuity of the channel in case the flaps are completely closed and connecting the channel to the hold when a flap is in the intermediate position, in which the discharge opening is still closed. Each flap comprises a pivotally attached hollow body with a wall opposite the pivot shaft, which wall extends concentrically in relation to said shaft.

Abstract: Vessel comprising two hull sections, pivotably connected together by hinges positioned above the center of the vessel and above the center of gravity of the separate hull sections. The vessel comprises a propulsion installation with one single propeller. The propeller shaft direction is parallel to the center line of the vessel within the central dividing plane of the vessel. Those parts of the hull sections determining the hold are joined through edges determined by the central dividing plane. Near the parts of both hull sections into or onto which the propulsion installation is positioned the hull sections are adjoined on a plane positioned at a distance from the central dividing plane such that the transverse cross sections of both hull sections are unequal. The propulsion installation is housed in the larger section.

Abstract: A digging wheel for a suction dredger vessel which digging wheel rotates about a horizontal axis and has at its circumference a plurality of closely spaced partly overlapping scoops while the suction mouth in the interior of the wheel has an extension which extends into the scoops and fits through the outlet of the scoops. The effective passage between the leading edge of a scoop and the outlet edge of a preceding scoop is smaller than the outlet and any further passage towards the pump is of the same or larger magnitude than the outlet of a scoop.