Abstract: An earth-working machine such as an excavator includes a mobile chassis having a support base on which an internal or external gear is fixedly mounted. A slider ring is mounted on the underside of a turntable with a hydraulic motor mounted thereon and having a drive pinion held in mesh with the internal or external gear. A carriage supporting an excavating mechanism has an internal or external gear fixed to the underside of the carriage and rotatably mounted on an annular holder fixed to the turntable. An intermediate shaft is rotatably journalled in at least one bearing mounted on the turntable and has a pair of pinions fixed thereto and held in mesh with the gears, respectively. Alternatively, an intermediate shaft may have a pinion held in driving mesh with the gear secured to the carriage and driven by another hydraulic motor mounted on the turntable through sprockets and a chain trained therearound.

Abstract: An earth-working machine includes a first internal gear fixedly mounted on a mobile chassis, a turntable coaxially rotatably mounted on the first internal gear, a carriage rotatably mounted on the turntable in eccentric relation thereto and having a second internal gear, an earth-working mechanism mounted on the carriage, a first hydraulic motor mounted on the turntable and having a first pinion held in driving mesh with the first internal gear for rotating the turntable about its own axis, a second hydraulic motor mounted on the turntable and having a second pinion held in driving mesh with the second internal gear for rotating the carriage about its own axis, and hydraulic driving devices for actuating the first and second hydraulic motors independently or in synchronism. The hydraulic driving devices may be controlled by an electric control system supplied with signals from angle detectors such as rotary encoders for detecting angular displacements of the turntable and the carriage.

Abstract: An elevating apparatus including a base, a platform, at least a pair of pivotally interconnected boom assemblies connecting the base and the platform together, the pair of boom assemblies including a pair of hollow middle booms pivotally interconnected substantially centrally thereof by a shaft, and upper and lower booms telescopically disposed in each of the middle booms and movable out of upper and lower ends of the middle booms, the lower booms having ends pivotally mounted on the base in spaced relation and the upper booms having ends pivotally mounted on the platform in spaced relation, each of the boom assemblies including a synchronizer for synchronizing intervals of extension of the upper and lower booms from the middle boom, a pair of hydraulic mechanisms operatively coupled between the shaft and the base at spaced locations thereon for moving the middle booms to displace the upper and lower booms into and out of the middle booms to lift and lower the platform, and a controller for selectively contro

Abstract: A telescopic boom for use on an elevating apparatus includes a first boom, a second boom telescopically disposed in the first boom, a third boom telescopically disposed in the second boom, a rolling mechanism disposed between the first and third booms and rollingly movably on wall surfaces of the first and third booms, and a locking lever assembly disposed on each of ends of the second and third booms in the first boom for selectively engaging the rolling mechanism to connect the rolling mechanism to one of the second and third booms at a time.

Abstract: An elevating apparatus includes a base such as a mobile chassis, a platform, a telescopic boom assembly connecting the base and the platform together, the telescopic boom assembly being composed of a plurality of telescopically coupled booms axially aligned with each other, at least one first hydraulic cylinder disposed in the telescopic boom assembly for extending and contracting the telescopic boom assembly, a pair of second parallel hydraulic cylinders operatively coupled between the telescopic boom assembly and the base for tilting the telescopic boom assembly with respect to the base, a pair of parallel third hydraulic cylinders operatively coupled between the telescopic boom assembly and the platform for keeping the platform substantially parallel to the base, and a hydraulic control system for operating the first, second, and third hydraulic cylinders in synchronism to move the platform toward and away from the base in a substantially perpendicular relation to the base while the platform is stably main

Abstract: An earth-working machine such as an excavator includes a mobile chassis having a support base on which an internal or external gear is fixedly mounted. A slider ring is mounted on the underside of a turntable with a hydraulic motor mounted thereon and having a drive pinion held in mesh with the internal or external gear. A carriage supporting an excavating mechanism has an internal or external gear fixed to the underside of the carriage and rotatably mounted on an annular holder fixed to the turntable. An intermediate shaft is rotatably journalled in at least one bearing mounted on the turntable and has a pair of pinions fixed thereto and held in mesh with the gears, respectively. Alternatively, an intermediate shaft may have a pinion held in driving mesh with the gear secured to the carriage and driven by another hydraulic motor mounted on the turntable through sprockets and a chain trained therearound.

Abstract: An elevating apparatus comprises a substantially horizontal base, a longitudinally extensible mast mechanism mounted vertically on the base, a wire guide mechanism mounted on the mast mechanism and having a pair of pulleys rotatable synchronously in opposite directions, a work platform supported on the wire guide mechanism, and a pair of wires extending across the mast mechanism and having one ends fixed to the base respectively at spaced positions thereon, the wires being wound around the pulleys, respectively. The elevating apparatus also includes a pair of wire tensioners mounted on the base respectively at spaced positions thereon for longitudinally tensioning the wires, respectively, in opposite directions.

Abstract: An elevating apparatus installed on a mobile body such as a crawler-type vehicle or truck comprises at least a pair of middle supporting beams pivotably coupled together by a pivot and unfoldable into an X shape, and two pairs of lower and upper supporting beams slidably supported in the pair of middle supporting beams. The lower and upper supporting beams can be pushed out of and retracted into the middle supporting beams by a hydraulic mechanism for lifting and lowering a lift or platform mounted on the upper supporting beams.

Abstract: A digger comprises a carrier with wheels and trestles, the carrier having a stage, a transversible member disposed to the stage, a supporting base pivoted to the transversible member, and means for operating a digging-up mechanism with a bucket crane supported to the supporting base.

Abstract: A lifting apparatus comprising a basic support, a link-mechanism of the pantograph type extensively supported on the support, a platform provided on the link-mechanism, and driving devices actuated by hydraulic pressure to stretch the link-mechanism upwards. Each of the driving devices is comprised of a hydraulic cylinder, guiding members provided on opposite ends of the hydraulic cylinder, and a flexible connecting member. Both ends of the connecting member are connected respectively to upper and lower link levers of the link-mechanism, with the connecting member being in contact with the guiding member. Thus, the extension movement of the cylinder is transmitted to the link levers by the connecting member to stretch the link-mechanism of the pantograph type.

Abstract: Lifting apparatus comprising a foundation, a platform, and a lifting mechanism of pantographic type disposed between the foundation and the platform. The lifting mechanism is constructed with a plurality of superimposed X-link units, each of the X-link units comprising a pair of link levers rotatably connected to each other at a central portion to form an X-link. A lever arm is rotatably provided between the central portion and an end of the one of link levers, and driving apparatus is provided on the one of link levers for rotating the lever arm. One end of the lever arm is engaged with the other link lever connected with the end of the link lever carrying the driving apparatus, whereby the rotation of the lever arm expands the lifting mechanism of pantographic type.

Abstract: A lifting apparatus having a carriage, a pantograph comprising a plurality of X-link units provided on the carriage, and a platform provided on the pantograph. Each X-link unit comprises a pair of outer pipes rotatably connected to each other at a central portion to form an X-link and a pair of inner pipes slidably inserted into each of the outer pipes from the opposite ends. The end of the each inner pipes of the lowermost X-link unit is connected to the carriage and the end of each inner pipe of the uppermost X-link unit is connected to the platform. Driving means for extending and retracting each inner pipe is provided in each of the outer pipes. The pantograph is extended by extending the inner pipes for elevating the platform.