Abstract: A frame, a boom assembly, and an actuator. The boom assembly includes a first boom section having a proximal end coupled to the frame and a distal end opposite the proximal end and a second boom section pivotably coupled to the distal end of the first boom section. The actuator is reconfigurable between a locked configuration and an unlocked configuration. The actuator permits the boom assembly to move freely when the actuator is in the unlocked configuration. In the locked configuration, the actuator is positioned to couple the second boom section to the frame such that the actuator limits movement of the first boom section relative to the frame.

Abstract: A work machine includes: a multi-joint type work implement; a plurality of hydraulic actuators driving the work implement; an operation device outputting an operation signal to the plurality of hydraulic actuators; a storage section storing a target configuration defined by connecting a plurality of target surfaces; a control object surface selection section that in the case where a control point set at a claw tip of a bucket is under the target configuration, uses a target surface closest to the control point on the target configuration as a control object surface; and a target operation control section that controls the plurality of hydraulic actuators such that the operational range of the control point is limited to the control object surface and a region above the same in the case where an excavation operation is input from an operator via the operation device.

Abstract: A telehandler includes a frame assembly, tractive elements, a cabin, a boom assembly, and a locking mechanism selectively reconfigurable between a locked configuration and an unlocked configuration. The boom assembly includes a base boom section having a proximal end pivotably coupled to the frame assembly and a distal end opposite the proximal end, an intermediate boom section pivotably coupled to the distal end of the base boom section, and an upper boom section having a proximal end pivotably coupled to the intermediate boom section and a distal end configured to be coupled to an implement. The boom assembly is configured to move freely when the locking mechanism is in the unlocked configuration. In the locked configuration, the locking mechanism is configured to couple the intermediate boom section to the frame assembly such that the locking mechanism limits rotation of the base boom section relative to the frame assembly.

Abstract: A hydraulic control device of a forklift truck includes a first hydraulic cylinder, a first instructing member, a second hydraulic cylinder, a second instructing member, a hydraulic pump, an electric motor, a first oil passage, a lowering control valve, a second oil passage that is branched from the first oil passage at a junction, a flow control valve, a first pilot passage through which pressure in the first oil passage at a position between the first hydraulic cylinder and the lowering control valve is applied to a first accommodating chamber of the flow control valve as the pressure upstream of the lowering control valve, and a second pilot passage through which pressure in the first oil passage at a position between the lowering control valve and the hydraulic pump is applied to a second accommodating chamber of the flow control valve as the pressure downstream of the lowering control valve.

Abstract: An apparatus for a crane comprises a large-cavity pressure sensor, a small-cavity pressure sensor, a controller, a telescopic oil cylinder, and a telescopic oil cylinder regulator. The large-cavity pressure sensor can measure the oil pressure in a large cavity of the telescopic oil cylinder. The small cavity pressure sensor can measure the oil pressure in a small cavity of the telescopic oil cylinder. The controller can control an output electrical signal according to a large-cavity oil pressure fed back by the large-cavity pressure sensor and a small-cavity oil pressure fed back by the small-cavity pressure sensor, and, by means of the electrical signal, control a change of the amount of hydraulic oil flowing into and out of the large cavity and the small cavity of the telescopic oil cylinder so as to regulate the oil pressures in the large cavity and the small cavity.

Abstract: A hydraulic system for a mobile machine is disclosed. The hydraulic system may have a first actuator, a first valve arrangement, a second actuator, and a second valve arrangement. The hydraulic system may also have at least one operator interface device movable by an operator to generate a first signal indicative of desired work tool movement in a first manner, and a second signal indicative of desired work tool movement in a second manner; and a controller configured to generate a first flow rate command directed to the first valve arrangement based on the first signal, and generate a second flow rate command directed to the second valve arrangement based on the second signal. The controller may also be configured to selectively generate a third flow rate scaled from the first flow rate command and directed to the second valve arrangement based on only the first signal.

Abstract: In a construction machine, a boom assist cylinder (7A) assists an operation of a boom (4) by a hydraulic pressure, and an arm assist cylinder (8A) assists an operation of an arm (5) by a hydraulic pressure. An accumulator (16) accumulates operation oil to be supplied to the boom assist cylinder and the arm assist cylinder in a pressurized state. A first hydraulic pipe (14) connects between the boom assist cylinder and the arm assist cylinder. A second hydraulic pipe (12) connects between the arm assist cylinder and the accumulator. The second hydraulic pipe is connected to a hydraulic connection port of the arm assist cylinder so that the operation oil is supplied in a direction of closing the arm from the accumulator to the arm assist cylinder.

Abstract: A detection link of a spill guard link mechanism is pivoted and connected to a bucket bracket in a position proximate to a bucket pivot support axis rotatably supporting a bucket and above a lower surface of a boom.

Abstract: Provided is a freight loading system of a trailer including: a loading container having a loading section in which freight is loaded; a conveyor installed at the loading section, and conveying the freight into the loading container using a drive motor; a palette on which the freight is loaded to be conveyed by the conveyor; a palette up/down cylinder installed at the loading section; a palette lifting member for lifting the loading palette over the conveyor using the palette up/down cylinder; a palette fixing part for fixing the loading palette lifted over the conveyor by the palette lifting member; a freight fixing cylinder for pressing and fixing the freight loaded on the loading palette; and a pressure supply apparatus for supplying hydraulic or pneumatic pressure to operate the palette up/down cylinder and the freight fixing cylinder.

Abstract: A loader-type heavy construction machine has a chassis and work equipment. The work equipment includes two parallel arms articulated relative to the frame, a bucket articulated relative to the arms, a set of link rods forming, with a portion of the bucket and of the arms, a deformable parallelogram, and a bucket actuator capable of being controlled to cause deformation of the deformable parallelogram so as to orient the bucket with respect to the arms. A cam is moved by a connecting bar connected at one end to the deformable parallelogram so that the position of the cam is dependent on the orientation of the bucket with respect to the chassis. The cam interfaces with an hydraulic circuit to ensure that the bucket is maintained in a position preventing it from accidentally tipping over backwards, regardless of commands exerted on an hydraulic manipulator by a driver of the machine.

Abstract: The present invention relates to a wheeled shovel loader that comprises a boom (3) capable of pivoting about an axis (4) as well as loading shovel (13) that can be actuated by a tilting structure (11, 12). According to this invention, at least one additional arm (7) connecting the boom (3) and the loading shovel (13) is hinged so as to be capable of displacement in the same way as a parallel linkage or parallelogram on said arm (3) under the action of at least a first connecting rod (8) and at least a second connecting rod (9). The shovel loader of the present invention comprises means for controlling the displacement of the additional arm (7) according to the angular position of the boom (3) relative to its pivot axis (4), as well as means for maintaining the loading shovel (13) in a horizontal position.

Abstract: An industrial lift truck has a boom that is raised and lowered by a first hydraulic actuator and a load carrier that is pivoted with respect to the boom by a second hydraulic actuator. In the event that the supply of hydraulic fluid for powering the actuators fails, the boom may be lowered by gravity by draining fluid from the first hydraulic actuator. To prevent a load from sliding off the load carrier as the boom descends, the load carrier is pivoted to maintain a substantially constant angular relationship to the ground. This is accomplished by selectively conveying fluid drained under pressure from the first hydraulic actuator into the second hydraulic actuator. Changes in the position of the boom are sensed and, in response, the flow of fluid into the second hydraulic actuator is controlled to produce corresponding changes in the load carrier position.

Abstract: A hydraulic control system for controlling the orientation of a material handling unit on a lift boom. The control system includes a flow divider/combiner valve operative in a boom-raise, unit-leveling mode to pass a portion of the fluid displaced from the rod end of the boom cylinder to the base end of the unit cylinder, and operative in a boom-lower, unit-leveling mode, to combine the fluid stream displaced from the base end unit cylinder in a preset ratio with pressurized fluid, and pass the combined stream to the rod end of the boom cylinder. A modulating valve controls flow to and from the base end of the boom cylinder and is pilot actuated to inhibit descent of the boom until the pressure in the unit cylinder reaches a level at which the unit cylinder initiates levelling of the unit.

Abstract: A control system for a lift boom pivotable with respect to a vehicle by a boom cylinder and material handling unit pivotable with respect to the boom by a unit cylinder when the control of a boom control valve and a unit control valve. The control system includes a flow divider/combiner valve and operative in a boom-raise, unit-leveling mode to pass a preset portion of the fluid displaced from the rod end of the boom cylinder to the base end of the unit cylinder. The flow divider-combiner valve is operative in a boom-lower, unit-leveling mode, to combine the fluid stream displaced from the base end unit cylinder in a preset ratio with pressurized fluid, and pass the combined stream to the rod end of the boom cylinder. The control system can be disengaged from the automatic leveling mode to enable the boom unit to be operated manually under the control of the boom and unit control valves.

Abstract: An apparatus for controlling movement of an implement relative to a frame of a work machine is disclosed. The apparatus includes a lift arm having an implement, such as a bucket, pivotally coupled thereto. The apparatus also includes a pivot bar which is pivotally coupled to the lift arm via a coupling pin. A first hydraulic cylinder is coupled to the pivot bar. A second hydraulic cylinder is also coupled to the coupling pin. The first hydraulic cylinder and the second hydraulic cylinder are both actuated so as to lift the lift arm. Moreover, the first cylinder is actuated so as to tilt the bucket. A number of position sensors are provided to communicate output signals indicative of the position of the lift arm and the bucket to a controller. The controller processes such output signals and thereafter alters the position of a pair of proportional fluid valves associated with the first and second hydraulic cylinders.

Abstract: An upper boom compensation system for an aerial device having an articulating boom assembly. The lower boom is raised and lowered by a special double cylinder having two pistons and a common piston rod. A hydraulic circuit is arranged to transfer fluid between the lower boom cylinder and the upper boom cylinder in a manner to raise and lower the upper boom correspondingly to raising and lowering of the lower boom. The upper boom can also be controlled independently of the lower boom.

Abstract: A motorized lift truck, with a telescopic arm (9), comprising a chassis (1) mounted on a plurality of wheels of which at least one (7) is power driven. The chassis (1) carries a motor propulsion group (3), a cab (2) and lifting structure (4) disposed between the motor propulsion group (3) and the cab (2). The lifting structure (4) is the telescopic arm (9) mounted pivotably about a substantially horizontal axle (10). The assembly of the lifting structure (4) comprising the telescopic arm (9) is displaceable transversely, so as to permit precise adjustment over a predetermined distance (d) of the position of the lifting structure (4) so as to engage the load. The truck is adapted to be loaded up on the rear of a carrying vehicle and comprises a chassis (1) having a U shape.

Abstract: The hydraulic circuit of the invention includes first and second directional control valves 13, 15, each shiftable between three positions. Hydraulic circuit extending from the second directional control valve 15 and a second cylinder 7 to a first cylinder 11 is so configured that, when the second directional control valve 15 is shifted to the first position, with the first directional control valve 13 being assigned to the N-position, hydraulic oil from the second cylinder 7 is directed to the first cylinder 11, so as to cause the attachment 9 to be tilted in the forward direction, and when the second directional control valve 15 is shifted to the second position, hydraulic oil expelled from the second cylinder 7 is directed to the first cylinder 11, so as to cause the attachment 9 to be tilted in the rearward direction.

Abstract: A work machine includes a boom which is pivotally connected at one end to the machine and is provided at the other end with a tool carriage which is attached to the boom at a pivot which is fixed with respect to the boom. The tool carriage is associated with a mechanism for maintaining it at a constant attitude when the boom is raised and lowered. The boom further includes an extension for improving the versatility of the machine.

Abstract: A loader vehicle comprising a body having a front end and a rear end and provided with ground engageable propulsion means, an operator's compartment and a boom assembly, comprising a lift arm assembly and a pivot member which projects transversely from the inner end of the lift arm assembly on one side thereof and extends transversely across the body from said one side of the lift arm assembly and which is pivotally mounted on the body, adjacent the rear end thereof, for movement of the lift arm assembly between a raised position and a lowered position in which the lift arm assembly extends forwardly alongside the operator's compartment and means for carrying a material handling implement at an outer end of the boom assembly so as to be disposed forward of the front end of the body, wherein the pivot member is pivotally mounted, for movement about a first axis, on a torsion member, which extends transversely across the body, by first pivotal mounting means disposed at positions which are spaced apart transver

Abstract: A loading/unloading vehicle having booms and a bucket carried thereon such as a shovel loader, a wheel loader or the like vehicle detects that a true bucket-to-ground angle coincides with a preset angle after the vehicle starts automatic turning movement of the bucket. When the coincidence is detected, the automatic turning movement of the bucket is interrupted. Thereafter, a differential value between the true bucket-to-ground angle and the preset angle is determined, if any and then the bucket angle is corrected so as to allow the differential value to be reduced to zero. Consequently, the bucket is held at the preset angle after the bucket stops, even though the booms continue to be turned.

Abstract: Apparatus and system for loading and unloading a load onto and from a load carrying device mounted on a vehicle which is capable of producing a significant lift of the load and changing the angular position of the load at different load elevations. A bellcrank supports the load carrying device. A first pin pivotally mounts the bellcrank to the vehicle. A second pin pivotally mounts the load carrying device to the bellcrank. A first power device pivots the bellcrank around the first pin and a second power device pivots the load carrying device around the second pin.

Abstract: The present invention is directed to a linkage connectable between a frame and an attachment. The linkage is characterized as self-leveling, meaning that once an attitude or orientation of the attachment with respect to the ground is achieved, the linkage will maintain that attitude as the attachment is raised or lowered without additional operator input. A preferred linkage connectable between the frame of a loader vehicle and a loader bucket includes an arm pivotally connectable between the frame and bucket, a hydraulic lift cylinder pivotally connectable between the frame and arm for raising and lowering the arm and resultantly the bucket, an equalizer link pivotally connectable to the arm at the same location as the lift cylinder, a hydraulic tilt cylinder pivotally connectable between the bucket and one end portion of the equalizer link, and an equalizer bar pivotally connectable between the frame and the other end portion of the equalizer link.

Abstract: A loading/unloading vehicle having booms and a bucket carried thereon such as a shovel loader, a wheel loader or the like vehicle detects that a true bucket-to-ground angle coincides with a preset angle after the vehicle starts automatic turning movement of the bucket. When the coincidence is detected, the automatic turning movement of the bucket is interrupted. Thereafter, a differential value between the true bucket-to-ground angle and the preset angle is determined, if any and then the bucket angle is corrected so as to allow the differential value to be reduced to zero. Consequently, the bucket is held at the preset angle after the bucket stops, even though the booms continue to be turned.

Abstract: An apparatus for controlling the posture of a front loader has booms attachable to a vehicle body which are pivotally movably upward and downward and has a work implement attached to the forward ends of the booms and pivotally movable in a scooping direction and a dumping direction. Each of the booms and the implement are pivotally movable by a single control lever independently of each other or movable simultaneously. The apparatus includes an actuating member for shifting the control lever from a boom raising position to a boom raising and dumping position when the booms are not positioned lower than a specified level. This eliminates the likelihood of the implement tilting rearwardly downward even if the booms are raised, precluding the implement from spilling the earth or sand scooped up.

Abstract: An electronic bucket positioning and control system for a vehicle of the type including a hydraulically controlled boom assembly and bucket. The bucket positioning and control system can operate in a bucket positioning mode, bucket return to position mode, bucket anti-rollback mode, and tilt cushion mode.

Abstract: A forklift truck having a fork assembly connected to a telescopic auxiliary boom articulated to a telescopic main boom. The telescopic and articulating features of the auxiliary boom in conjunction with the telescopic feature of the main boom increases the range and reach of the fork assembly to above ground heights and to below ground depths.

Abstract: A boom and bucket system for a loader includes a bucket leveling valve which maintains a desired orientation of the bucket as the boom is raised or lowered. A hydraulic circuit automatically and selectively supplies fluid for bucket leveling from boom cylinder return flow, from a pump, or from both in varying proportions.

Abstract: A load handling device for transferring ISO flat racks, containers or the like, to and from a support comprising two spaced lifting arms (11) pivotally connected adjacent their lower ends (at 9) to said support (13) and hydraulic rams (40,41) for rocking said arms (11) in a vertical arc, and an extension arm (53) pivotally connected to the end of each lifting arm (11) remote from its pivotal connection (9) to the support (13) and further hydraulic rams (55,57) for rocking each extension arm (53) about its pivotal connection to its lifting arm (11) through a vertical arc extending to either side of the longitudinal axis of the lifting arm (11).

Abstract: The invention provides a system for automatically balancing the jib of cranes of the type with articulated arms or telescopic arms depending on the variation of the reach of this jib.The annular section chambers of the hydraulic cylinder controlling the auxiliary arm of the crane and of the hydraulic cylinder controlling the pivoting arm carrying the counterweight are connected in series by a duct. The full section chambers of the hydraulic cylinders are connected selectively, by actuation of a valve, either to the pressure line or to the return line. In the right-hand position of the valve, the counterweight is pivoted and the arm is raised simultaneously, whereas in the opposite position of the valve the arm is lowered and the counterweight is raised.

Abstract: An aerial lift having means for sensing a combination of the load placed on the upper end of the upper boom and the relative position of the upper boom with respect to horizontal and for generating a signal or interrupting supply of hydraulic fluid to the upper boom lift cylinder in the event the moment on the upper boom exceeds a selected moment.

Abstract: An electronic bucket positioning and control system for a vehicle of the type including a hydraulically controlled boom assembly and bucket. The bucket positioning and control system can operate in a bucket positioning mode, bucket return to position mode, bucket anti-rollback mode, and tilt cushion mode.

Abstract: An improved forklift device for unloading palletized articles from the bed of a flatbed truck may be removably carried in "piggyback" fashion on the rear end of the truck. The device has a fork structure adapted to liftingly engage one of the pallets, a wheeled, ground-supportable frame, and an articulated linkage structure which interconnects the frame and the fork structure and is movable between a fully lowered and rearwardly retracted position and a fully raised and forwardly extended position. The forklife may be propelled along the ground by an engine-driven hydraulic drive system, and is also provided with a hydraulic actuating system for pivoting gantry and boom portions of the linkage, and pivoting the fork structure relative to the linkage. In unloading the articles the fork structure may be moved a substantial distance laterally across the truck bed to liftingly engage the pallet of an article on the far side of the bed.

Abstract: Extended-reach lift apparatus for remote accessing of low-clearance areas is provided. The apparatus includes a vehicle whose frame supports a vertically pivotable telescoping boom which is elevatable by means of hydraulic rams. An extended tilt head is provided on the free end of the boom which includes parallel upper and lower link members of equal length. A work implement support having a discrete work implement tilting cylinder is attached to the remote ends of the upper and lower links of the tilt head. A hydraulic cylinder extending between the boom and the lower link of the tilt head provides separate tiltability of the tilt head while the design of the tilt head mechanically assures the maintenance of the attitude of the work implement without requiring additional hydraulic compensation during such tilting.

Abstract: A self-propelled, low-profile, high-lift loader having the ability to lift loads higher above grade and lower below grade than previous such loaders of the same size category. The loader includes a main frame and a boom support frame pivotally connected at one end to the main frame. Power means are provided for elevating the opposite end with respect to the main frame. A boom butt is connected to the movable or free end of the boom support frame. The boom is pivotally rotatable about a horizontal axis on the boom support frame. Elevation of the boom support frame elevates the butt of the boom so as to extend the reach of the boom, as well as position the boom butt in an orientation permitting the boom to be extended downwardly to a below-grade location.

Abstract: A control apparatus having a boom control system for controlling the movement of a liftable boom supported by a vehicle body and a working device control system for controlling a working device pivoted to the boom. Each of the control system includes a proportional solenoid valve and comprises an instruction circuit for producing an instruction signal in accordance with the amount of manipulation of an operating lever, discriminating circuit for determining the direction of operation of the valve from the instruction signal, a reference signal generator, a comparison circuit for comparing the instruction signal with the reference signal from the generator to obtain a pulse signal of a width in proportion to the amount of manipulation, and drive circuit for converting the pulse signal into a current to drive the valve in the direction determined by the discriminating circuit. The boom, as well as the working device, is movable at a speed corresponding to the amount of manipulation of the operating lever.

Abstract: A boom mechanism including a linkage which interconnects the frame of a loader with the boom arm and the loader bucket. The linkage includes a cross-shaped member having arms extending forwardly, rearwardly and laterally. The rearward arm is pivotally connected to a hydraulic cylinder which is pivotally connected to the frame. The forward arm is pivotally connected to the bucket. The two lateral arms are pivotally connected to a pair of push rods which are pivotally connected to the sides of the boom arm.

Abstract: A method of operating a boom which comprises an elongate member mounted on a base for pivotal movement about a first axis transverse to the axis of the elongate member, first fluid operated power means mounted between the base and the elongate member to control raising and lowering of the member about said first axis, an implement mounted at one end of the member for pivotal movement about a second axis transverse to the axis of the elongate member, second fluid operated power means comprising a double acting ram having a cylinder and plunger slidable therein, mounted between the implement and the member to control movement of the implement about the second axis, means to feed fluid under pressure to and from the first fluid operated power means along first feed lines via a first operating valve, means to feed fluid under pressure to and from the second fluid operated power means along second feed lines via a second operating valve, a displacement means comprising a further double acting fluid operated ram co

Abstract: A self-leveling series type hydraulic system including boom and bucket valves which separately control boom and bucket cylinders and a flow divider valve positioned in the exhaust flow path from the rod end of the boom cylinder. The flow divider valve splits the flow sending a portion of it to the cap end of the bucket cylinder so as to maintain the bucket in a level condition during raising of the boom with the remaining flow returning to the control valve downstream of the boom valve along with the return flow from the rod end of the bucket cylinder which is also returned to the control valve downstream of the boom valve whereby the bucket valve can be separately actuated concurrent with the boom valve and supplied with oil so as to override the self-leveling function if desired.

Abstract: A self-leveling series type hydraulic system including boom and bucket valves which separately control boom and bucket cylinders and a flow divider valve positioned in the exhaust flow path of the rod end of the boom cylinder. The flow divider valve splits the flow sending a portion of it to the cap end of the bucket cylinder so as to maintain the bucket in a level condition during raising of the boom with the remaining flow connected to one of the boom valve motor ports. An improved boom lower circuit which bypasses the flow divider valve as the boom is lowered to achieve a faster boom lower rate and the inclusion of an unloading valve in the bucket circuit which includes the dual function of preventing cavitation and relieving high pressure.

Abstract: A mechanism for use on a boom-type vehicle includes load lifting forks carried by a low profile twist-resistant carriage which is one link in a low profile parallelogram linkage attached to a fly section of the boom and maintained level in all positions of the boom by a slave cylinder connected between the boom and a slave link which constitutes a member of the parallelogram linkage. The mechanism can be adjusted to many positions while automatically maintaining the relative position of the forks with respect to the vehicle frame for any boom angle. The mechanism can be adjusted to provide a long reach over or under obstructions in order to remove or place a load. It may also engage loads below ground level. Load pick-up or placement can be performed in confined areas which are unreachable by conventional forklift trucks.

Abstract: An earth moving machine having a boom, a dipperstick, and a bucket all mounted for pivotal movement one with respect to the other, a double acting cylinder for each of the boom, the dipperstick, and the bucket, respectively, for controlling the pivotal movement of the bucket, for raising and lowering the boom, and for extended and retracting the dipperstick.

Abstract: A hydraulic circuit for a hydraulic power shovel of the type having a swingable boom, swingable arm and a bucket attached to the end of the arm. The hydraulic circuit includes a levelling cylinder adapted to extend and contract in response to the swinging of the arm, and a switching valve device movable between a first position where it provides a communication between the levelling cylinder and a boom cylinder and a second position where it provides a communication between the levelling cylinder and an arm cylinder. When the switching valve device takes the first position, the levelling cylinder is communicated with the boom cylinder so that the boom is swung downwardly in response to the upward swinging of the arm, thereby to move the bucket horizontally. On the other hand, when the switching valve device takes the second position, the levelling cylinder and the boom cylinder are disconnected hydraulically so that the arm is allowed to swing independently of the boom.

Abstract: A self-leveling series type hydraulic system including boom and bucket valves which separately control boom and bucket cylinders and a flow divider valve positioned in the exhaust flow path from the rod end of the boom cylinder. The flow divider valve splits the flow sending a portion of it to the cap end of the bucket cylinder so as to maintain the bucket in a level condition during raising of the boom with the remaining flow connected to one of the boom valve motor ports whereby the bucket valve can be separately actuated concurrent with the boom valve and supplied with oil so as to override the self-leveling function if desired.

Abstract: A transport vehicle particularly for moving large structural members such as prefabricated concrete enclosures is provided with a lifting device which may be moved in the longitudinal direction of the vehicle and which consists of a support arm pivotal about a first axis extending transversely to the longitudinal direction of the vehicle. The support arm is arranged to be inserted into an enclosure or other load to be transported by an end thereof opposite said first axis which has a support device thereon pivotally mounted for rotation about a second axis parallel to said first axis.

Abstract: The invention relates to a hydraulic loader comprising a boom, a balance beam and a bucket for loading material, boom jacks and balance beam jacks being coupled between the frame and the boom and between the boom and the balance beam. A secondary jack is also coupled between the frame and the boom and comprises an active chamber, while a first conduit connects this active chamber to the extension chamber of the balance beam jack and a first cut-off valve is disposed in this first conduit, establishing, in its first position, communication of the two sections of the first conduit which are connected thereto, isolating, on the contrary, in its second position, these two sections. One application of the invention is the production of a powerful and efficient loader.

Abstract: A bucket leveling mechanism that automatically operates a tilt cylinder for pivoting the bucket so that the attitude of the bucket remains substantially constant as the bucket lift arms are raised. Two push-pull cable assemblies are provided; one cable assembly senses the rotation of the bucket and the other cable assembly senses the pivotal movement of the lift arms. The cable assembly for the bucket is attached between the bucket and a wedge shaped block that operates a spool control valve for the bucket tilt cylinder. The lift arm cable assembly is attached to a lift arm at one end and includes an opposite roller end that engages one side of the wedge shaped block, with the block being sandwiched between the control valve spool and roller end of the lift arm cable assembly. The wedge shaped block includes a cam surface that is movable between the control valve spool and roller end of the lift arm cable assembly in proportion to the relative movement of the bucket and lift arms.

Abstract: An apparatus for hydraulic self-leveling of a loader bucket or the like is described wherein the loader upon which the bucket is mounted comprises a pair of spaced-apart boom arms pivotally mounted on a sub-frame attached to the tractor. The loader bucket is pivotally connected to the forward ends of the boom arms and may be pivotally moved from a level position to an extreme dump position or an extreme roll-back position by means of hydraulic cylinders extending between the loader bucket and the boom arms. A first leveling cylinder is connected to one of the boom arms and one of the sub-frame towers so that upward movement of the boom arms causes the cylinder rod of the actuator cylinder to be extended therefrom and so that downward movement of the boom arms causes the cylinder rod of the actuator cylinder to be moved inwardly into the cylinder.

Abstract: A mobile tree harvester includes a shear mounted at the base of a harvesting frame for shearing a tree trunk, a grip arm pivotably mounted to the frame above the shear for gripping the tree trunk, delimbers mounted above the grip arms for removing branches from the trunk, and an endless tract mounted on each grip arm for propelling the tree trunk along the forward frame. Lift arms pivotably couple the forward frame to a main body of a wheeled vehicle. A sway mechanism is coupled to both lift arms to provide for relative movement of one lift arm with respect to the other such that the harvesting frame can sway from the vertical position in a left or right direction. A tilt mechanism is coupled to the harvesting frame, lift arm, and main body to maintain the frame in its vertical ground position as the lift arms lift the frame off the ground. The tilt mechanism also tilts the frame about an axis transverse to the vehicle axis to a horizontal position such that the sheared end of the tree trunk faces rearwardly.

Abstract: A large hydraulic excavator machine for mining operations comprises attachment means for operatively connecting the shovel to the machine frame so that no bending moment is imposed on the component parts of the attachment means during operation of the excavator. The attachment means comprises components including a stroke arm movable by an extendable and retractable hydraulic stroke arm cylinder; and a shovel arm assembly on which the bucket is mounted and which is movable by an extendable and retractable hydraulic shovel arm cylinder. The stroke arm and stroke arm cylinder are pivotally connected at their lower ends to spaced apart points on the excavator frame and are pivotally connected at their upper ends to a common point. The upper end of the shovel arm assembly is also connected to the common point. The shovel arm cylinder has one end pivotally connected to the machine frame (or to an extension therefrom) and has its other end pivotally connected to the shovel arm assembly.