Abstract: A hydraulically operated tool adapted to remove coatings and surfaces from a substrate. The tool may comprise a robotic machine that includes a surface removal tool, a manipulator arm, and a rotation assembly. The manipulator arm may position the surface removal tool to a location along the substrate. The rotation assembly may adjust an angular position of the surface removal tool. A first end of the manipulator arm may be coupled to the surface removal tool, and a second end of the manipulator arm may be coupled to the rotation assembly. The manipulator arm may be hydraulically extended and retracted. The rotation assembly may comprise a spindle, and may be attached to a hinge pin and an air bladder.

Abstract: A compact utility loader incorporating a boom of adjustable length. The boom may include one or more lift arm assemblies, with each lift arm assembly including a first lift arm that telescopically receives a second lift arm. Each lift arm assembly also includes a telescoping actuator adapted to telescopically extend and retract its second lift arm relative to its first lift arm. A load-sensing system may be provided and adapted to limit lift arm assembly extension based at least in part upon a tool load applied at a tool supported by the boom.

Abstract: A self-checkout system can include a plurality of telescoped bagging arm segments moveably coupled together in an order according to respective diameters of the plurality of telescoped bagging arm segments. A scanning system can be configured to provide a characteristic of an item purchased by a user of the self-checkout system and a processor circuit can be operatively coupled to the plurality of telescoped bagging arm segments and to the scanning system, where the processor circuit can be configured to move the plurality of telescoped bagging arm segments relative to one another based on the characteristic of the item to be placed in a bag in use with the self-checkout system.

Abstract: This invention relates to a truck mounted forklift (TMFL), more specifically an electrically powered TMFL. The TMFL comprises a U-shaped chassis having a pair of side bars bridged by a rear cross bar, a pair of front wheels, and a rear wheel. The TMFL further comprises a lifting assembly, a driver's station, and a battery pack mounted on the chassis. Each of the front wheels is provided with a dedicated electric wheel motor assembly. The electric wheel motor assemblies each comprise an interior permanent magnet (IPM) motor having a drive shaft, and a planetary gear box coupled to the IPM motor. The planetary gear box is mounted axially in-line with and is driven by the drive shaft. The IPM motor is mounted substantially internal the side bar and the planetary gear box is mounted substantially internal the bounds of the wheel rim. In this way, a very compact configuration of drive assembly for the front wheels is provided.

Abstract: A hydraulic system for controlling bleed down and retraction of a boom within a safety envelope includes a backup battery power supply, and at least a first boom lift hydraulic cylinder configured to raise and lower the boom. The first boom lift hydraulic cylinder includes a solenoid bleed valve electrically connected to the backup battery power supply. The hydraulic system also includes an input device controllable by an operator of the boom. The input device may, for instance, be used by the operator to initiate bleed down and retraction of the boom from an elevated position. To accommodate independent failsafe features of the system, the input device is configured to selectively actuate the solenoid bleed valve using electrical power supplied from the backup battery power supply.

Abstract: A modular robot system which may be configured to accommodate packages of varying sizes is provided. The modular robot may include a base having omni-directional wheels and cameras and sensors, one or more modular containers, and a lid, which may be releasably linked together to form a small, medium or larger units. The base may include a lifting mechanism to vertically raise the robot to a desired height in alignment with a delivery vehicle. Moreover, retractable loading arms of the vehicle may be extended from the vehicle to engage with the robot to facilitate self-loading of the robot into the delivery vehicle.

Abstract: A mining or construction vehicle comprising an extendable boom comprised of a first and a second telescopic section extending in a longitudinal direction, wherein the first telescopic section is arranged to be connected to the mining or construction vehicle and a hydraulic device is arranged to be connected to a mounting device at a free end of the second telescopic section, wherein a hydraulic cylinder is arranged in connection to the extendable boom to govern extension of said extendable boom. Hydraulic conduit for supply of hydraulic fluid to the hydraulic device on the mounting device are arranged through the length of the extendable boom.

Abstract: Described is an electric telehandler (1) comprising: one or more traction apparatuses (3, 51, 6) equipped with a drive wheel (3); movement means comprising a plurality of hydraulic actuators, a hydraulic distributor (2) to actuate the actuators and a pump (21) for supplying the distributor (2); and an electric motor (4, 41, 42, 43, 44, 45, 46, 47, 48, 49) connected directly to the traction apparatus and/or to the pump (21) of the movement means.

Abstract: A mining or construction vehicle comprising a boom extending in a first direction, which boom, via a first and a second rotation device, is connected to a hydraulic device arranged on a mounting device arranged at a free end of said boom, the first rotation device being arranged to provide a rotation around a first axis that is substantially parallel to the first direction, and a second rotation device being arranged to provide a rotation around a second axis that is arranged at an angle with respect to the first axis. Hydraulic conduits for supply of hydraulic fluid to said hydraulic device on said mounting device are arranged through at least one of the first and second rotation devices.

Abstract: A self-checkout system can include a plurality of telescoped bagging arm segments moveably coupled together in an order according to respective diameters of the plurality of telescoped bagging arm segments. A scanning system can be configured to provide a characteristic of an item purchased by a user of the self-checkout system and a processor circuit can be operatively coupled to the plurality of telescoped bagging arm segments and to the scanning system, where the processor circuit can be configured to move the plurality of telescoped bagging arm segments relative to one another based on the characteristic of the item to be placed in a bag in use with the self-checkout system.

Abstract: Lift assemblies and methods of operating same. A method includes providing a lift assembly including a first support member and a boom pivotably coupled with a second support member. The lift assembly also includes a bearing disposed between the first and second support members. The bearing includes an inner ring and an outer ring and a gear is engaged with one of the inner ring and the outer ring. A lift line is coupled with the boom. The method also includes attaching the first support member to the vehicle, pivoting the boom relative to the second support member about a first axis, and rotating the second support member relative to the first support member about a second axis perpendicular to the first axis. Further, the method includes attaching a load to the lift line and operating the lift assembly to move the load onto a roof of the vehicle.

Abstract: A utility loader incorporating a boom of adjustable length. The boom may include either or both of a left and right lift arm assembly, with each lift arm assembly including a rear lift arm that telescopically receives a front lift arm. Each lift arm assembly also includes an extension actuator adapted to telescopically extend and retract its front lift arm relative to its rear lift arm. A detection system may be provided and adapted to limit lift arm assembly extension based at least in part upon a load applied at a tool supported by the boom and a relative telescopic location of a front lift arm relative to its associated rear lift arm.

Abstract: A hybrid loader boom arm assembly kit for a loader work vehicle includes a hollow first beam formed from a lightweight material, and a block formed from a second lightweight material. The block is configured to couple within the first beam. The kit includes at least one first steel reinforcing plate configured to couple to the first beam at the end, and at least one connecting plate configured to couple to the at least one first reinforcing plate.

Abstract: A quick coupling implement for an aerial device has a base, a boom assembly, the implement, and an adapter. The adapter is emplaced on a portion of the boom assembly to allow for quickly coupling the implement. The adapter comprises a boom-raise-interfacing segment with at least one opening for securing to the boom raise of the boom assembly via a retaining pin. The adapter also comprises an implement-interfacing segment that presents a complementary shape to an adapter-receptor segment of the implement. The implement may be a utility platform for supporting a utility worker.

Abstract: An arm unit of a robot has a lower arm mechanism including a parallel link structure and an upper arm mechanism. The lower arm mechanism has a front link and a rear link including respective lower ends rotatably connected to the base portion. A lower arm drive mechanism has a lower ball screw and a lower bearing portion supporting a shaft so as to be rotatable about its axis. An extending portion extending from the lower end of the rear link is connected to a nut so as to be rotatable about a nut side rotational axis. The lower bearing portion is connected to a base portion so as to be rotatable about a bearing portion side rotational axis. Thus, high mechanical rigidity can be ensured over a wide operation range under a high load condition.

Abstract: A detachable thumb assembly for a construction equipment machine includes a mounting bracket for attaching the thumb assembly to a digging apparatus of the machine, a thumb pivotally connected on the mounting bracket, a thumb cylinder including a cylinder body connected to the mounting bracket and a cylinder rod which extends from a front end of the cylinder body and which is connected to the thumb. The body of the thumb cylinder is pivotally connected to the mounting bracket at a connection portion of the body which is distinct from a body back end portion.

Abstract: An industrial machine and a method of controlling an industrial machine, the industrial machine including a dipper supported by a dipper handle. The method may include determining an operating phase of the industrial machine, in a first operating phase of the industrial machine, limiting, with at least one controller, a reach of the dipper handle, and in a second operating phase of the industrial machine, enabling, with the at least one controller, an extended reach of the dipper handle greater than the reach in the first operating phase. The industrial machine may include at least one controller configured to determine an operating phase of the industrial machine, in a first operating phase of the industrial machine, limit a reach of the dipper handle, and, in a second operating phase of the industrial machine, enable an extended reach of the dipper handle greater than the reach in the first operating phase.

Abstract: A longitudinal stability monitoring system controls a boom lift down speed for a lift vehicle. The lift vehicle includes a vehicle chassis supported on front and rear wheels respectively coupled with a front axle and a rear axle, and a boom pivotally coupled to the lift vehicle. The system monitors a vertical load on the rear axle and manages boom lift down speed based on the vertical load. Additionally, the system may manage the boom lift down speed based on both the vertical load on the rear axle and an anticipated operator demand according to a signal from an operator input device.

Abstract: A controller for use with a machine comprising a machine body, and a load handling apparatus coupled to the machine body and moveable by a movement actuator with respect to the machine body, the controller being configured to receive a signal representative of the position of the load handling apparatus with respect to the machine body and a signal representative of a moment of tilt of the machine, wherein the controller is further configured to issue a signal for use by an element of the machine including the movement actuator, which in response to the signal issued by the controller, is configured to restrict or substantially prevent a movement of the load handling apparatus when a value of the signal representative of the moment of tilt reaches a threshold value, the threshold value being dependent on the signal representative of the position of the load handling apparatus with respect to the machine body.

Abstract: A mining shovel roller saddle block structure has first and second pairs of rollers which roll atop the shovel's dipper handles. Shafts mounted within the rollers are rotatably supported by block clamps fastened to shelves fixed atop the shovel's saddle blocks. Drop stops fixed to the shelves between the rollers extend over the dipper handles. Cables coupled between the block clamps and the drop stops retain the structure if it is dislodged by a collision with greenhorn protrusions on the dipper handles.

Abstract: A method of operating a working machine which includes a main structure and a working arm pivotally mounted at one end on the main structure. The working arm is raisable and lowerable relative to the main structure by a first actuator device, and is extendible relative to the main structure by a second actuator device. In use, the arm carries at another end a working implement which can carry a load. The machine further including a ground engaging drive structure by which the machine is drivable on the ground. The machine has a longitudinal load moment control system which automatically disables operation of the first and/or second actuator devices from increasing longitudinal instability in the event that a predetermined instability is sensed. When the machine senses a ground travelling speed above a threshold speed, the longitudinal load moment control system is disabled.

Abstract: A work vehicle includes a first loader arm portion pivotably connected at one end to a frame of the vehicle and configured to slidably receive a second loader arm portion along an opposed end of the first loader arm portion. A mechanical linkage interconnects the loader arm portions and the frame. A fluid cylinder operatively connected between each of the frame and the loader arm portions is configured to raise and lower the loader arm portions between a retracted (lowered) position and an extended (raised) position. As the fluid cylinder is actuated to urge the loader arm portions toward the extended (raised) position, the mechanical linkage results in slidable movement of the second loader arm portion with respect to the first loader arm portion so that a collective length of the loader arm portions in the extended (raised) position is increased.

Abstract: An industrial machine includes a frame supporting a boom, an elongated member movably coupled to the boom, an attachment, a conduit, and a reel supporting at least a portion of the conduit. The boom includes a first end coupled to the frame and a second end opposite the first end. The elongated member is movably coupled to the boom and includes a first end and a second end. The attachment is coupled to the second end of the elongated member. The conduit extends between the frame and the attachment. The reel is rotatably supported on a support shaft. The reel rotates about an axis of rotation to reel in and pay out the conduit as the elongated member moves relative to the boom.

Abstract: An earthmoving machine includes a frame, a boom, an elongated member, an attachment, a conduit, and a reel. The frame supports a fluid source. The boom includes a first end coupled to the frame and a second end opposite the first end. The elongated member is movably coupled to the boom and includes a first end and a second end. The attachment is coupled to the second end of the elongated member. The conduit is in fluid communication with the fluid source and conveys fluid between the fluid source and the attachment. The reel supports at least a portion of the conduit. The reel is rotatable to reel in and pay out the conduit as the elongated member moves relative to the boom.

Abstract: A saddle block assembly including a main body having a shipper shaft opening through the main body bottom end, and an eccentric pin opening in the main body top end, an eccentric pin received in an eccentric pin opening in the top end of the main body, and a wear plate support. The wear plate support has a pin receiving opening, the eccentric pin being received in the pin receiving opening. Wear plates are mounted on the bottom end of the wear plate support and are adapted to bear against the top of a dipper handle.

Abstract: A vehicle is provided with a chassis having a footprint, a load carrying structure, and a support assembly coupling the chassis and the structure. The support assembly is adapted to move the structure relative to the chassis between a stowed position and a deployed position outboard of the footprint of the chassis. A plurality of wheels is configured to roll on the support surface and a plurality of axles coupling the wheels to the chassis are provided. Each axle includes at least one spindle supporting an individual wheel for rotation on a spindle axis. A steering system is adapted to position the wheels between driving and rotation arrangements with respect to the chassis such that in the rotating arrangement each of the plurality of wheels rotate relative to the chassis whereby the chassis, the platform and the support assembly may rotate in unison about the steer axis.

Abstract: A saddle block assembly including a main body having a shipper shaft opening through the main body bottom end, and an eccentric pin opening in the main body top end, an eccentric pin received in an eccentric pin opening in the top end of the main body, and a wear plate support. The wear plate support has a pin receiving opening, the eccentric pin being received in the pin receiving opening. Wear plates are mounted on the bottom end of the wear plate support and are adapted to bear against the top of a dipper handle.

Abstract: A method of operating a working machine which includes a main structure and a working arm pivotally mounted at one end on the main structure. The working arm is raisable and lowerable relative to the main structure by a first actuator device, and is extendible relative to the main structure by a second actuator device. In use, the arm carries at another end a working implement which can carry a load. The machine further including a ground engaging drive structure by which the machine is drivable on the ground. The machine has a longitudinal load moment control system which automatically disables operation of the first and/or second actuator devices from increasing longitudinal instability in the event that a predetermined instability is sensed. When the machine senses a ground travelling speed above a threshold speed, the longitudinal load moment control system is disabled.

Abstract: A boom extension apparatus is provided for a prime mover such as a skid-steer loader or vehicle wherein the rearward end of the boom extension apparatus is quickly and easily attachable to the forward ends of the boom arms of the skid-steer loader. The forward end of the boom extension apparatus is quickly and easily attachable to the rearward end of an implement such as a bucket, bale spear, etc.

Abstract: There is provided a telescoping boom system for an excavating apparatus which includes a linkage member having a pivot segment and lever segment pivoted about a rotating fixed boom. A first hydraulic cylinder is coupled from the fixed boom to the pivot segment. A second hydraulic cylinder is coupled from the lever segment to a retractable outer boom. The first hydraulic cylinder extends to rotate the pivot segment away from a proximate end of the fixed boom, thus forcing the lever segment to rotate towards the proximate end of the fixed boom. The second hydraulic cylinder retracts and combines with the extension force of the first hydraulic cylinder across the linkage member to provide a retraction force to the outer boom.

Abstract: A sliding deck for carrying loads in transit and both lifting or lowering the loads includes a spaced pair of pivoting outer tubular tower members having hydraulically operated cylinders interior to a pair of telescoping tubular inner members located interior to the outer tubular tower member in which the pivoting of the tower members is controlled about a pivot by a supporting hydraulically-operated cylinder. A friction-relieving feature for accommodating movement of the interior telescoping member may include a Teflon brand wear pad fixed on the inner surface of the fixed outer tubular tower member. Together, the fixed outer tubular member and the sliding interior tubular member form a pivoting tower-like support member at an incline relative to the truck bed.

Abstract: A hydraulically operated wedge lock system is disclosed to provide a releasable mechanical lock between relatively movable telescoping boom segments. Each wedge lock mechanism includes a backing wedge block connected to a relatively stationary boom segment It defines an angled smooth surface. A stationary shaft is supported generally parallel to the angled surface of the backing wedge block with a stationary piston secured to the shaft at an end. A slidable wedge block is supported for reciprocal movement on the angled surface. It includes a bore having a closed end defining a receptacle between the end and the stationary piston; and, a compression spring is disposed in the receptacle biased to urge the closed end of the bore away from the stationary piston. The end of the bore is closed with a gland to define a chamber with the piston. A port is provided to supply hydraulic fluid to urge the slidable wedge block against the bias of the spring.

Abstract: A telescopic boom materials handling vehicle includes a vehicle chassis and a transfer carriage supported by the chassis and configured for longitudinal displacement relative to the chassis between the retracted position and an extended position. A telescopic boom is pivotably affixed at a first end to the transfer carriage. A control system controls operation of the telescopic boom to maintain a height of the load supported by the telescopic boom during longitudinal displacement by the transfer carriage, regardless of a terrain slope on which the vehicle chassis is supported.

Abstract: A vehicle of the industrial truck type comprises a chassis (3), at least three wheels (4) arranged to support the chassis while resting on the ground and a lifting unit (8) connected to the chassis having one or more members (9) arranged to carry loads and a power arrangement to raise and lower the load-carrying members relative to the chassis. The lifting unit is carried by the chassis via a mast-like beam (12), that is pivotably connected to the chassis about a substantially horizontal axis. Power means is arranged to pivot the beam about this axis relative to the chassis.

Abstract: A boom for a load handling machine, the boom has a mounting by which the boom is mounted on a body of the machine, and at least first and second telescoped sections. In use, the boom carries a load handling implement at or towards its outermost end. The first boom section is telescoped within the second section and is extendible and retractable relative to the second boom section by an actuator. At least the first boom section includes walls made at least predominantly of a composite material. A bearing member is located where adjacent walls meet to extend along a substantial length of the first boom section to provide bearing surfaces during sliding of the first boom section relative to the second boom section. Bearings also may be provided on the interior of the second boom section to further protect the first boom section.

Abstract: A slide arm for a work implement is provided, which is simply structured to obtain improved assembling precision thereby ensuring smooth operation. To this end, the slide arm is such that a plurality of tubular structural bodies (i.e., outer and inner tubes), each of which is formed by bending a one-piece plate into a shape having a substantially triangular cross-section and circular vertex portions, are telescoped one within the other with sliding members (i.e., plain bearing units and slide block pieces) interposed between them at the vertex portions and such that a sliding mechanism is disposed for sliding the tubular structural bodies.

Abstract: The present invention relates to a device at lift trucks, including a chassis (3) with a driving compartment (2) and a lifting device (9) for lifting goods.

Abstract: In the operation of work machines of the type having an extensible arm, the maximum reach of the arm for a given work machine is limited by such factors as the vehicle's weight, body size and engine placement. The present invention provides for a work machine arrangement in which a work machine has an engine cooling apparatus mounted to the work machine body such that the engine cooling apparatus's longitudinal axis is oriented substantially parallel to the arm longitudinal axis.

Abstract: The present invention relates to a forklift having a traversing carriage for moving longitudinally along a frame of the forklift, an outer guide rail for guiding the carriage being disposed relatively low to the operator cockpit so as to minimize the obstruction of operator visibility of the surrounding terrain.

Abstract: A motor vehicle for industrial and/or agricultural operations, in particular an agricultural tractor, is described with an attachment interface containing a three-point implement hitch (24). In order to widen the spectrum of applications of the vehicle and the capability of the attachment interface and in order to open up new areas of application for the motor vehicle, a telescoping arm (16) that can be pivoted in the vertical direction is connected in a joint to the vehicle chassis (14). A support (22) is arranged at the free, extensible end of the telescoping arm (16) and carries the attachment interface for the three-point implement hitch (24). A locking arrangement (38, 40) is provided by which the support (22) can be immobilized with respect to the vehicle chassis (14), when the telescoping arm (16) is in an operating position.

Abstract: A slide arm for a work implement is provided, which is simply structured to obtain improved assembling precision thereby ensuring smooth operation. To this end, the slide arm is such that a plurality of tubular structural bodies (i.e., outer and inner tubes), each of which is formed by bending a one-piece plate into a shape having a substantially triangular cross-section and circular vertex portions, are telescoped one within the other with sliding members (i.e., plain bearing units and slide block pieces) interposed between them at the vertex portions and such that a sliding mechanism is disposed for sliding the tubular structural bodies.

Abstract: A telescoping lift arm assembly has an outer lift arm tube that is formed with a cross section configuration that has spaced side walls, and outwardly extending flange guide panels at the lower portions of the side walls. An inner lift arm tube is generally bell-shaped and fits into the outer lift arm tube and has outwardly flared flanges that are parallel to the flange guide panels of the outer lift arm tube. The inner lift arm tube is held in place with a cross support plate that is supported to the side walls of the outer lift arm tube, to hold the inner lift arm tube in place. There are linear bearings between the mating outwardly flared flanges and panels, as well as between the support plate and mating lower surfaces of the inner lift arm tube. Fasteners are provided to adjustably hold the support plate secured to the outer lift arm tube.

Abstract: Transfer machine, intended for transferring loads (K), especially containers, wherein the transfer machine comprises a frame (R) equipped with a wheelwork (P); a horizontal support plane (1) located in connection with the frame (R) for supporting the load (K) during the transfer, and a vertical transfer apparatus (S) for lifting the load (K) on the support of the support plane (1) and off the support of the support plane (1), wherein the vertical transfer apparatus (S) is arranged to lift and lower loads (K) from the side of the transfer machine and thereby from the side of the support plane (1). The vertical transfer apparatus (S) of the transfer machine is placed in connection with the frame (R) on the first side of the support plane (1), and the vertical transfer apparatus (S) is arranged to reach over the support plane when lifting or lowering the load (K), in order to move the load (K) onto the support plane (1) or off the support plane (1) from the second side of the support plane (1).

Abstract: A telescopic boom arrangement of a vehicle is provided with a fixed, tubular outer boom and an inner boom which is mounted for sliding within the outer boom. Transmission lines for coupling various functions, carried at the end of the inner boom, with a power source/and or controls include an intermediate section mounted to the outer boom by a transmission line routing assembly which holds first ends of the intermediate section of the transmission lines at a fixed location and establishes a guide along which second ends of the section of transmission lines is moveable lengthwise of the outer boom. The intermediate section of the transmission lines is flexible and defines a bow which changes in length as the inner boom extends and retracts relative to the outer boom.

Abstract: A forklift has a travelling carriage, a straddle arm disposed on the travelling carriage, a mast disposed on the straddle arm to be reciprocally movable in a horizontal direction, a fork disposed on the mast to be movable up and downm, and a cover disposed on the travelling carriage. When the mast is in a reach-in operation, the cover covers at least an upper side of an article supported by the fork.

Abstract: An arrangement for controlling a work machine which includes (i) a boom and (ii) a coupling mechanism secured to an end of the boom is disclosed. The arrangement includes a first control assembly having (i) a first gripping portion and (ii) a first actuator secured to the first gripping portion so that the first actuator can move relative to the first gripping portion.

Abstract: A delimber having a standard carriage and a delimbing boom, the delimbing boom slidably mounted through the carriage. A drive module is detachably connected to the carriage for use in moving the boom relative to the carriage. Two different types of booms and up to three different drive modules, each with a different drive, can be provided. The boom and module selected to give the operating characteristics desired by the operator are connected to the carriage. Drive transfer members, in the form of cable or chain drives, are connected between the selected drive module and the selected boom. The module carries a variable displacement hydraulic motor. The motor is connected by a gear box to the drive transfer member. On delimbers using cable drives, at least one end of each cable is connected to the delimber with a hydraulic tensioner.

Abstract: A vehicle designed to be operated either as a lifting machine or as an agricultural tractor, comprising a bearing structure with motor-driven wheels, a control and driving cab, a telescopically extendable and retractable lifting boom arranged on one side of the control and driving cab and swingable relative to the bearing structure around a transverse axis located at the front end of the lifting boom, whose rear end carries a three-point hitch for agricultural implements to be operated by a rear power take-off. The lifting boom itself provides a power-lift for agricultural implements.

Abstract: A telescopic boom arrangement of a vehicle is provided with a fixed, tubular outer boom and an inner boom which is mounted for sliding within the outer boom. Transmission lines for coupling various functions, carried at the end of the inner boom, with a power source/and or controls include an intermediate section mounted to the outer boom by a transmission line routing assembly which holds first ends of the intermediate section of the transmission lines at a fixed location and establishes a guide along which second ends of the section of transmission lines is moveable lengthwise of the outer boom. The intermediate section of the transmission lines is flexible and defines a bow which changes in length as the inner boom extends and retracts relative to the outer boom.

Abstract: A material handling vehicle comprising a structure having ground engageable propulsion means and a material handling means comprising a boom mounted on the structure for raising and lowering swinging movement relative to the structure and driven for said raising and lowering movement by a first drive means and said boom being extendable and being driven for extension or retraction by a second drive means and a material handling implement carried by an outer end part of said boom, wherein the material handling implement comprises a carrier and a load engageable device moveable relative to the carrier, a first sensing means to sense a first position of the device relative to the carrier, said drive means being responsive to the said first sensing means sensing said first position to modify operation of said drive means.