Abstract: An apparatus for padding a pipeline lying in a ditch separates fine particles from coarse particles in the material excavated from the ditch and windrowed along the side of the ditch. The apparatus includes a frame having an open ended hollow separating drum having a plurality of scoop members adapted to lift and drop excavated material through a screen located beneath the scoop members. The scoop members are spaced above the screen a distance such that the efficiency of the separating drum is increased.

Abstract: The present invention relates to a rotor box for a ground milling machine, in particular for a road milling machine or a trench milling machine, having at least one milling roller accommodated therein for loosening and/or removing soil material. It is provided that at least one guide device is arranged in the interior of the rotor box, which, in cooperation with the rotating milling roller causes a conveyance of the loosened milled material in the axial direction (L) of the milling roller or at least supports such a conveyance. The present invention also relates to a ground milling machine, in particular a road milling machine or trench milling machine, which has at least one such rotor box.

Abstract: An all-earth foundation trencher has a digger body (1) pivotal selectively on a track-laying chassis (7). The digger body has an earth-mover blade (16) that is manipulatable multi-directionally on a front end. A digger boom (19) has a base end that is pivotal vertically forward from an aft end of the digger body. A digger head (22) is manipulatable on a digger end of the digger boom for power-digging foundation trenches having desired widths and depths in all likely consistencies of earth that ranges from hard and rocky earth to loose dirt. Conveyors (28–31) are positioned intermediate the track-laying chassis and the digger head for conveying removed earth sufficiently far from either or both sides of a foundation trench that the removed earth will not spill back into the foundation trench. A laser guide (99) proximate the digger head provides control assurance of accurate attitudinal digging. Operational controllers (102) include control knobs (104) on knob plates (49) positioned on a control panel (45).

Abstract: A linear compressor driving device for linear compressor driving a piston in a cylinder by means of a linear motor to generate a compressed gas, has an inverter for outputting an alternating current to be supplied to the linear motor; current detecting means for detecting an output current from the inverter; voltage detecting means for detecting an output voltage from the inverter; current amplitude value determining means for determining a current amplitude value of the output current; output power calculating means for calculating an output power from the inverter based on the detected output current and the detected output voltage; frequency determining means for determining a frequency of the output current such that the output power is maximum; and inverter controller for controlling the inverter based on the determined current amplitude value and the determined frequency.

Abstract: A bucket wheel excavator has a scraper blade mounted on the bogie and whose height is independent of the raising and lowering of the bucket wheel to maintain a level track for the crawler bogie. The scraper blade can be tilted about a horizontal axis by at least one hydraulic cylinder.

Abstract: A bucket-wheel excavator has its bucket-wheel conveyor stopped when a truck is fully loaded so that a new truck can be brought into position, the continuously-operating bucket wheel filling the bucket-wheel chute with a first store of the material. After an empty pass of the dumping conveyor, the bucket-wheel conveyor is driven at a creeping speed and a second store of the material is formed in the receiving chute of the dumping conveyor which is turned onto operate at creeping speed when the material reaches the upper belt drum of the bucket-wheel conveyor belt. Once the empty truck is in position, the belts are accelerated to maximum speed.

Abstract: The open cast mining apparatus comprises two sets of running gear between which a cutting drum is provided on a chassis. The conveyor tract is formed by an axial discharge conveyor inside the cutting drum, a vertical worm conveyor and a conveyor in the discharge jib or in the connecting bridge. The latter is supported on a loading carriage travelling parallel to a working face belt. The cutting drum is so designed that the mining machine can excavate and pick up material to be conveyed in both travelling directions.

Abstract: A continuous vertical the ground-excavating arrangement which comprises a guide post for being driven vertically into the ground deeper than the desired excavation depth so that said guide post can stand independently of excavation, a lower earth loading mechanism slidably secured to the guide post, a lower earth loading mechanisms, a vertical conveyor including an endless chain and conveying containers, and a horizontal earth discharging mechanism secured to the top end of the guide post. The lower earth loading mechanism includes means for securing cut ends of the endless chain for ease in adding chain links to the endless chain as the lower earth loading mechanism is periodically moved to lower excavating depths.

Abstract: An excavating and pipeline installation system includes an excavating vehicle, an excavating wheel assembly and a plurality of conveyors. The excavating wheel assembly includes a pair of excavating wheels for excavating a pipeline receiving trench at a predetermined location beneath the surface of the earth. The excavating wheel assembly is supported at the front end of the vehicle on a subframe mounted for pivotal movement relative to the vehicle between excavating and traveling positions. The excavating wheels are mounted for rotation about angularly disposed axes and are positioned to receive the pipeline therebetween. Bolster rollers are mounted on the excavating wheel assembly for initially lifting the pipeline, and pipeline rollers are mounted on the vehicle for exerting a downwardly directed force on the pipeline upon insertion thereof into the pipeline receiving trench.

Abstract: An excavator comprising an excavating wheel mounted on a chassis, means supporting the chassis on the ground such that a portion of the wheel projects below ground level, and drive means for rotating the wheel about its axis, the wheel being adapted to cut a longitudinal trench having a predetermined transverse profile when it is rotated about its axis and the chassis is advanced over the ground in a given direction.

Abstract: An excavating and loading system including an excavating wheel assembly at the front thereof and a plurality of conveyors for conveying material from the excavating wheel assembly upwardly and rearwardly. The excavating wheel assembly includes a plurality of excavating wheels having an overall width in excess of that of the following portion of the system. A supporting and housing apparatus rotatably supports the excavating wheel assembly and includes portions which extend between adjacent excavating wheels. Electric motors are connected to drive shafts which extend to the excavating wheel assembly through the portions of the supporting and housing apparatus that extend between adjacent excavating wheels. A right angle gearbox is connected to each drive shaft and powers the excavating wheel through a planetary speed reducer. Apparatus is provided for raising and lowering the excavating height of the excavating wheel assembly to thereby vary the grade of the excavation.