Abstract: A hoist system hoists a flat screen television or a heavy object in a room for attachment to a wall mounted attachment fixture. The hoist system has a wheel-supported base, and a central pillar with a raising and lowering element. The central pillar has a counter weight projection arm with a plurality of notches for carrying a counterbalance weight. A projection arm extends from the movable element in the direction opposite to the counterbalance weight arm with a downward pointing extension that carries a plurality of adjustable L-shaped brackets. The hoist system is brought close to a television or heavy weight at ground level and the L-shaped brackets are inserted therebelow. Weight balance is checked and a counterweight is placed on an appropriate notch in the counterbalance weight arm. The flat screen television or heavy object is then lifted to the correct height for wall attachment.

Abstract: The within invention relates to a crane with a boom slewable in a vertical pivoting plane and a bracing boom arrangement, particularly a derrick boom arrangement in which a luffing cable is arranged between the boom and the bracing boom arrangement, in which the luffing cable has at least two guying cables that run from two guying points arranged on the opposite side of the pivoting plane, which cables belong to the bracing cable arrangement, to the boom, in which the two guying cables are each movable by means of a winch and in which a mechanical coupling is provided between the two winches by means of which the movement of the two winches can be force coupled.

Abstract: A jack-up offshore platform, on which is provided a lifting crane for lifting a load, which lifting crane includes structure connectable to the platform for counterbalancing the load. The counterbalancing structure may include at least one counterbalancing cable for operably connecting to the platform. A lifting crane provided with counterbalancing structure connectable to a jack-up offshore platform, and to a method of repositioning a load from a platform.

Abstract: The invention relates to a method and device for changing the position of large-area glass plates which are stationary or moving, having the following features: one or more devices located on a level plane, each having a plurality of suction devices (12), are connected to the glass plates (10) to be re-positioned by means of a vacuum, b) the devices are connected to a lifting column (4) in a rotatable and pivotable manner, c) the devices can travel horizontally in the gripping area of the glass plates (10), d) the lifting column (4) has a counterweight (5) supplied with compressed air to compensate for the moving weight of the devices, e) the suction device (12) disk caps are spring-loaded in their holders, can be tilted in every direction, and are provided with a filter element (27), a controllable vacuum can be applied to each of the suction devices (12) individually, with a computer program as the controller.

Abstract: A ring derrick includes a carriage which moves on a fixed circular track around a stationary counterweight. A tension and compression column assembled from transportable tubular segments is affixed to the counterweight by a universal swivel joint. The back mast of the derrick is secured at its upper end to the tension column, while the main boom of the derrick extends radially away from the tension column. The main boom and back mast are hinged directly together at the carriage by massive hinge pins which pass through spherical bearings mounted on the carriage. The carriage's suspension distributes the load from the boom and mast to an array of trucks and has an automatic stabilizing system that compensates for uneven track.

Abstract: A counterweight block apparatus includes a pair of interconnecting counterweight blocks having top and bottom surfaces, the counterweight blocks forming a plane of interconnection along adjacent sides thereof; and a shear bar releasably secured between the adjacent sides of the interconnecting counterweight blocks, generally perpendicular to the plane of interconnection, to provide resistance to relative vertical movement of the interconnecting counterweight blocks along the plane of interconnection. In another aspect, each counterweight block includes in at least one side thereof an indentation from a top of the counterweight block to a depth more shallow than the thickness of the counterweight block, the indentation defining a lip for hand grabbing. An aperture may be formed through the rest of the thickness of the counterweigh block at each indentation, wherein a securing strap can be run through each aperture of a stacked plurality of counterweight blocks to secure them to each other.

Abstract: An articulated jib for moving a load is supported on a base and comprises a first jib arm pivotably connected to a base. The first jib arm functions as a bascule and is pivotable about a first axis. There is a first counterweight disposed on the first jib arm. A second jib arm is pivotably connected to the first jib arm and is pivotable about a second axis. A linking rod connects the second jib arm to a lever arm which is also pivotably connected to the base. There is a second counterweight disposed on the lever arm.

Abstract: A mobile lift crane includes a central crane unit, a boom unit and a counterweight unit. The central crane unit has a carbody, moveable ground engaging members and a rotating bed mounted to the ground engaging members with a rotatable connection such that the rotating bed can swing with respect to the ground engaging members. The boom unit has a support member, at least one moveable ground engaging member, and a boom pivotally mounted on the support member. The counterweight unit has counterweight on a support member. Rigging connects the boom and counterweight unit such that a load lifted by the boom can be counterbalanced by the counterweight. The boom unit and counterweight unit are connected to the central crane unit by structural members that carry compressive loads and maintain the boom unit, the rotating bed and the counterweight unit in lateral alignment with each other, but allow relative vertical movement between the boom unit, the rotating bed and the counterweight unit.

Abstract: A counterweight installation device includes: a weight support unit provided on a rear end of a body frame of a construction machine; a weight mounting unit disposed on a counterweight; a pin member for mounting the counterweight adapted to move between a first position at which the weight mounting unit is mounted on the weight support unit and a second position at which the weight mounting unit is dismounted from the weight support unit; and a rod device, one end of which is linked with the pin member and an other end of which extends so as to project to an outside of the counterweight, adapted to move the pin member between the first position and the second position by operation at the other end thereof.

Abstract: The object of the invention is to reduce the amount of investment required for the usage-optimized configuration and installation of large cranes. This object is achieved by a large mobile crane having an undercarriage, a drive unit (16), a revolving superstructure (18), one or more control stations (17), at least two jibs (3), at least one counter-jib (4), at least two lifting arrangements (22) and counterwvejghts arranged separately or on the basic structure, characterized in that the load-bearing parts of the crane (3, 4, 20) and the mobility-specific parts (5, 6, 7) are of modular design and can be supplemented by exchangeable and/or supplementary parts, wherein the structural units (modules) used essentially correspond, or are similar, to existing standard-crane components, and an increase in load-bearing capacity can be achieved by arranging a number of these in the large crane.

Abstract: The present invention relates to a crane vehicle having a base plate fastenable to its undercarriage to receive ballast and two hoisting means vertically fastened to the part of the superstructure projecting outwardly in the opposite direction to the boom, said hoisting means having first load receiving points which can be moved into cut-outs of connection rods arranged at the base plate and engage there into matched recesses, wherein in accordance with the invention both hoisting means are extended beyond the first load receiving points and are provided at their extended ends with second load receiving points which engage into corresponding shape-matched recesses of the connection rods.

Abstract: An overhead crane adapted to be supported by at least one main support beam includes a bridge adapted to travel in a substantially horizontal direction along the at least one main support beam, a trolley adapted to travel in a substantially horizontal direction along the bridge, a jib rotatably coupled to a bottom surface of the trolley, and a hoist adapted to travel in a substantially horizontal direction along the jib.

Abstract: The present disclosure relates to a lifting assembly such as a jib crane or similar apparatus having an articulated arm assembly and a flexible means for connecting a load to an actuator. The lift arm assembly forms an articulated cantilever boom, which is extensible so as to traverse a suspended load within a work cell area. The lift arm assembly further includes a first and second member pivotally connected to one another whereby an inclined plane (e.g., a cam) at the pivot point of the articulating arms provides a vertical displacement of the secondary arms thereby moving the distal end of the secondary arm to counterbalance inherent forces acting thereon.

Abstract: The present invention relates to a lattice mast crane having a traveling gear, a swiveling crown arranged on the traveling gear and a revolving deck which is rotatable via the swiveling crown and on which a main boom and a derrick boom are arranged and having a ballast box, with the revolving deck being mounted on the swiveling crown via a spacer tube and with the guide frame forming the track of the derrick ballast projecting outwardly beyond the ballast box.

Abstract: An adjustable counterweight for use on construction vehicles that includes a body having a first section, a central section adjacent to the first section and a second section adjacent to the central section, wherein the first section and the second section each define a cavity therein. At least one weight plate, preferably a plurality of weight plates, is mounted in a predetermined position within each of the cavities and secured to the body of the counterweight. Each weight plate is shaped to fit the contour of each cavity, such that the amount of weight contained within each cavity is maximized.

Abstract: Vessel including a hull of a substantially closed surface has at deck level a lifting crane, ballast tanks within the hull and a ballast control unit for admitting water to the ballast tanks for changing the draft of the vessel. The hull has a narrow lower section having first width over a height from keel level to a widening level, and a top section having a larger width than the lower section, extending from the widening level upwards towards deck level. The control unit is adapted to ballast the vessel to have a relatively shallow draft level in a transit mode, so that the wide top section is above water level, while the vessel is traveling, and to ballast the vessel to a relatively deep draft level in a lifting mode so that the widening level is below water level, at least when the vessel is substantially stationary and the crane is in its lifting position.

Abstract: The present invention relates to a crane vehicle having a base plate fastenable to its undercarriage to receive ballast and two hoisting means vertically fastened to the part of the superstructure projecting outwardly in the opposite direction to the boom, said hoisting means having first load receiving points which can be moved into cut-outs of connection rods arranged at the base plate and engage there into matched recesses, wherein in accordance with the invention both hoisting means are extended beyond the first load receiving points and are provided at their extended ends with second load receiving points which engage into corresponding shape-matched recesses of the connection rods.

Abstract: The present disclosure relates to a mobile crane comprising an undercarriage and a superstructure arranged in a revolving manner thereon with a device for the reception of ballast. In accordance with the present disclosure, the device for the reception of ballast comprising at least three pulling means which can be moved up and down vertically and which can be connected to a pallet or base plate carrying the ballast and located beneath the total center of gravity of the ballast to pull the pallet or base plate toward the superstructure and to connect it to it or to let it down from it.

Abstract: An adjustable counterweight for use on construction vehicles that includes a body having a first section, a central section adjacent to the first section and a second section adjacent to the central section, wherein the first section and the second section each define a cavity therein. At least one weight plate, preferably a plurality of weight plates, is mounted in a predetermined position within each of the cavities and secured to the body of the counterweight. Each weight plate is shaped to fit the contour of each cavity, such that the amount of weight contained within each cavity is maximized.

Abstract: The within invention concerns a crane with a superstructure that rotates on a vertical axle, a boom coupled to the superstructure in such manner as to luff on a horizontal axle, luffing equipment for luffing the boom, and an operating ballast that counteracts the moment of the boom. According to the invention, the crane is characterized by an auxiliary erection frame that can be attached to the superstructure and/or the operating ballast in such manner as to project backward and can be connected with an auxiliary erection ballast for the erection of the boom.

Abstract: A structure of mounting a weight in a forklift truck which has a frame and the weight that is to be connected and fixed to the frame by a bolt and a nut includes a first hole, a second hole, a first fitting part and a second fitting part. The first hole is formed through the frame. The second hole is formed through the weight in such a manner that the first hole and the second hole correspond to each other. The first fitting part is formed on the frame. The second fitting part is formed on the weight in such a manner that the first fitting part and the second fitting part fit to each other and that the first hole and the second hole are aligned with each other when the frame and the weight are combined together.

Abstract: In a counterweight attaching and detaching apparatus for a crane, the length of a suspension member is adjusted by an extendable member and links because the distance provided between the peak of a gantry and an upper surface of each of weights when the gantry is suspending the weight at a respective mounting position varies depending on the mounting position. In order to complement the adjustment of the length, different amounts of protrusion of rings from the upper surfaces of the weights are set so that the protrusion amount in the forefront weight is the largest and the protrusion amount in the rearmost weight is the smallest. This reduces the number of types of necessary links used in the suspension member to attach and detach the weights, and the number of operations of connecting and removing the links, and improves operation efficiency.

Abstract: The device combines ballast blocks (3) that can be stacked onto a base frame of the crane, and a gripper (2) for handling these blocks, the gripper being designed to be connected, during use, to a handling means. This device comprises means of nonpermanent connection, by hooking, between the gripper (2) and a ballast block (3) and means (34, 37, 38) for centering the stacked ballast blocks (3) relative to one another. The aforementioned connection means are constituted by two opposed gripping hooks (15, 16) mounted pivotably at the ends of a lifting beam (4) of the gripper (2) and interacting with transverse pins (35) of a block (3). The rear part of each hook (15, 16) is attached to a sling (27, 28), and a lock (21, 22) is assigned to it. The invention applies in particular to the ballasting of tower cranes.

Abstract: A camera crane has a boom arm pivotably connected to a post assembly. A track section is pivotably attached to the front end of the boom arm, and is leveled via leveling rods. The boom arm has a joggled section to provide clearance for a camera operator. A camera frame carrying a camera is linearly moveable along the track section. Pivot joints provide for adjustable drag on pivoting movement, without backlash or slip/stick movement.

Abstract: The device combines ballast blocks (3) that can be stacked onto a base frame of the crane, and a gripper (2) for handling these blocks, the gripper being designed to be connected, during use, to a handling means. This device comprises means of nonpermanent connection, by hooking, between the gripper (2) and a ballast block (3) and means (34, 37, 38) for centering the stacked ballast blocks (3) relative to one another. The aforementioned connection means are constituted by two opposed gripping hooks (15, 16) mounted pivotably at the ends of a lifting beam (4) of the gripper (2) and interacting with transverse pins (35) of a block (3). The rear part of each hook (15, 16) is attached to a sling (27, 28), and a lock (21, 22) is assigned to it. The invention applies in particular to the ballasting of tower cranes.

Abstract: A mobile crane includes an under carriage, a superstructure that is rotatably mounted on the superstructure, and a main boom, which is composed of a base body and several telescopic lengths up to a predetermined maximum number, which slide into one another and can be extended from the base body. The main boom is mounted on the superstructure so that it can rotate about a horizontal axis and its inclination can be adjusted by means of a hydraulic tilting cylinder that is hinged on the superstructure and the base body. A maximum permissible weight is predefined for the main boom, as a result of a restriction on the permissible axle load of the mobile crane during road haulage. The crane is also provided with a lifting capacity increasing device, which significantly increases the lifting capacity of the main boom when the telescopic lengths are extended, in relation to the state without the lifting capacity increasing device.

Abstract: A mobile crane, includes an undercarriage, a superstructure rotatably mounted on the undercarriage for supporting a counterweight, a slewable boom assembly and an operator's cab. At least one electric motor propels the undercarriage in an operating direction and is supplied with electric power for driving and crane operations by a power supply unit which is connected to the at least one electric motor by a cabling and configured as a diesel-electric drive, or a battery, or a multi-system drive formed by a combination of a diesel-electric drive with a battery, or a fuel-cell system.

Abstract: A crane vehicle is provided with a carrier and a rotating deck pivotable around a vertical axis thereon on which a boom swivellable around a horizontal axis is supported. Pallets are mounted at the projecting outer end of the rotating desk at both sides to receive counterweight slabs stacked on top of one another. To produce a greater balancing counter-moment to the boom and the load suspended thereon without putting on additional counterweight slabs, a frame can be attached to the outer end of the rotating deck, said frame being provided with accommodations or couplings at least for the respective rear suspension points of the pallets.

Abstract: A camera crane has a boom arm pivotably connected to a post assembly. The boom arm is extendible via an extension accessory kit. A track section is pivotably attached to the front end of the boom arm, and is leveled via leveling rods. The boom arm has a joggled section to provide clearance for a camera operator. A camera frame carrying a camera is linearly moveable along the track section. Pivot joints provide for adjustable drag on pivoting movement, without backlash or slip/stick movement. The track section is provided with a track frame and a slide head, so that the track section can be used apart from the crane.

Abstract: In the present crawler crane, an engine including a power plant for supplying driving pressure oil to a main winding drum, an auxiliary winding drum and a third drum is mounted on either left or right side of a revolving frame, a counterweight having a front side formed into a recessed surface is mounted at the rear of the main winding drum, the auxiliary winding drum and the third drum, and a boom rising and falling drum is installed within the recessed portion, thus making it possible to mount the third drum which has the same shape as the main winding drum and the auxiliary winding drum, for example. It is possible to provide a crawler crane capable of performing operation for versatile uses.

Abstract: A crawler traveling type working machine, comprising: a lower traveling body provided with crawlers on left and right sides; an upper rotating body mounted on the lower traveling body through a rotating means, the upper rotating body having a first counter weight; and a second counter weight interposed between an upper part of the lower traveling body and the rotating means. With this constitution, the stability of the working machine is excellent, the obstacle avoiding function when the upper rotating body rotates is excellent, and the rear rotating radius is smaller than the normal working machine of an upper class. Therefore, the working machine can be used as a working machine of an upper class.

Abstract: A camera crane has a boom arm pivotably connected to a post assembly. A track section is pivotably attached to the front end of the boom arm, and is leveled via leveling rods. The boom arm has a joggled section to provide clearance for a camera operator. A camera frame carrying a camera is linearly moveable along the track section. Pivot joints provide for adjustable drag on pivoting movement, without backlash or slip/stick movement.

Abstract: A wheeled crane constructed in such a manner that when the crane is to be transported on a road, the whole of the crane is lifted upward on a front side thereof, allowing front wheels 4 of a lower travel body 1 float from a road surface, and a coupling frame 19 provided at a front end portion of the lower travel body 1 is coupled to a coupler 23 of a tractor T, thereby permitting the crane to travel by itself as a semi-trailer while ensuring a long wheel base, as well as a method for transporting the wheeled crane, and a coupling type vehicle.

Abstract: Construction equipment such as an excavator is provided with a counterbalance assembly positioned at the aft end of the construction equipment. The counterbalance assembly includes a pair of enclosures and a counterweight. The pair of enclosures is separated by a back panel and a bottom panel connected to opposed side walls of the enclosures. The back panel, the bottom panel and the opposed side walls form an aperture for receiving the counterweight. The pair of enclosures and the counterweight are separable from each other and from the construction equipment to enable transportation of the construction equipment apart from the pair of enclosures and the counterweight.

Abstract: A railborne mobile crane mounted on a chassis with a superstructure, a counterweight and a boom which are arranged so as to be swivelable about a vertical axis of the superstructure. The superstructure is contoured so as to be within a prescribed clearance gauge of a section of track. The superstructure is outfitted with a device to compensate for superelevations of curved track sections. Longitudinal sides and a rear side of the superstructure are arranged so that, in every swiveling position, all contours of the superstructure lie within a defined safety area. The safety area is bounded on each of two sides of a longitudinal axis of the crane by an inclined plane which is inclined inward from the vertical, proceeding from a lower edge of the superstructure, by an angle of inclination at least corresponding to a maximum allowable angle of superelevation of the track.

Abstract: When a conventional swivel working vehicle is constructed such that a real part of a swivel body is not extended beyond a traveling device in order to improve an operability at a small site, a balance weight must he significantly increased in weight so as to prevent falling and tumbling of a machine body. In the invention, left and right core metal projections of a crawler are laterally offset from a center line of the crawler and right and left lugs are formed on an outer peripheral surface of the crawler. The lugs are formed to assume the same shape on the right and left sides or laterally symmetrical shapes or occupy the same area on the right and left sides, and to be symmetrically shaped about a center of rotation of the swivel body between the left and right crawlers of the machine body.

Abstract: A hoisting device (1) comprises at least a hoisting mast (7), a foot (4) arranged on the underside and connected to the hoisting mast, and a lifting device (6) connected at least to the top of the hoisting mast (7). The hoisting device (1) is assembled from components or elements (8), the largest of which has dimensions which do not exceed those of a normal container, whereby the entire hoisting device (1) can be transported easily and inexpensively by land, sea or air.

Abstract: A counterweight for a monorail hoist. The monorail hoist includes a single support beam and a suspended hoist assembly which is supported for movement along the support beam. The hoist assembly includes a support member which is transverse to the support beam. The counterweight is mounted on the support member. The counterweight is slidable along the support member to optimally balance the overall weight distribution of the hoist assembly. Once the counterweight is properly positioned to balance the hoist assembly, a locking device locks the counterweight to the support member to prevent any further movement of the counterweight along the support member. The locking device is also releasable to allow the counterweight to be moved to or removed from any location along the support member in order to accommodate any changes which may occur to the overall weight distribution of the hoist assembly. Preferably, a plurality of counterweights and cooperating locking devices are provided.

Abstract: A crane having an upper works rotatably mounted on a lower works and a boom pivotally mounted on the upper works, wherein the crane further comprises an apparatus and method for lifting, positioning, and assembling a counter weight to the upper works. The apparatus and method includes pivotally connecting a counter weight pivot frame between the counter weight and the upper works and lifting the counter weight into position with the hydraulic boom hoist cylinder. The crane further comprises a boom parking device.

Abstract: The automatic leveling and synchronization system for raising and lowering a counterweight includes at least a primary and secondary cylinder connected in series hydraulic communication. The primary cylinder includes a first rod connected to a first piston, and the first rod is attached to one end of a counterweight. The secondary cylinder includes a second rod connected to a second piston, and the second rod is attached to another end of the counterweight. A surface area of a bottom of the second piston is set equal to a surface area of a top of the first piston.

Abstract: A ring-supported lift crane is provided with a counterweight handling system to facilitate repositioning of the crane. The ring-supported crane includes a ring, a crane upper works and a crane lower works, a boom supported on rollers on the ring and a counterweight assembly also supported on rollers on the ring. The counterweight assembly preferably includes a counterweight carrier on which at least one stack of counterweight boxes or units are placed. A counterweight holder is interposed between the at least one stack of counterweight units and the counterweight carrier with a friction reduction device, such as rollers or slider pads, interposed between the counterweight holder and the counterweight carrier. When the ring-supported crane is to be repositioned for a second lift at a construction site, the counterweight holder with the stack of counterweight units is moved off of the counterweight carrier onto a separate counterweight support member, which may be mobile or stationary.

Abstract: A lifting device which includes a frame and an elongated boom having a lower end pivotally connected to the frame along a pivot axis. The lower end of the boom has a counterweight connected thereto offset from the pivot axis. The counterweight has a center of gravity which is movable with respect to the pivot axis of the boom. The counterweight can be freely pivotal, fixed, or partially fixed with respect to the boom. When linkage is provided between the counterweight and the boom, the counterweight can be rolled or tilted so as to move the counterweight center of gravity with respect to the pivot axis of the boom.

Abstract: A lifting device which includes a frame and an elongated boom having a lower end pivotally connected to the frame along a pivot axis. The lower end of the boom has a counterweight connected thereto offset from the pivot axis. The counterweight has a center of gravity which is movable with respect to the pivot axis of the boom. The counterweight can be freely pivotal, fixed, or partially fixed with respect to the boom. When linkage is provided between the counterweight and the boom, the counterweight can be rolled or tilted so as to move the counterweight center of gravity with respect to the pivot axis of the boom.

Abstract: The invention provides a self-mounting counterweight device which is mounted to one end of the chassis frame of the vehicle. The counterweight is U-shaped having two vertical sides and an outward wall defining an internal enclosure. The counterweight includes a rod mounted to the top of the counterweight for suspending it from a boom and includes lateral threaded bolts to releasably mount the counterweight to blocks on the chassis frame. The lifting boom has an inward end journalled to the frame and an outward end with tackle for releasably connecting the boom outward end to the counterweight suspending rod. A hydraulic cylinder provides mechanical lift with an inward end journalled to the frame and an outward end pivotally connected to the boom. The combination of the boom and lift provides a scissor-like lever for selectively raising and lowering the counterweight between a lowered and mounted position.

Abstract: A lifting device which includes a frame and an elongated boom having a lower end pivotally connected to the frame along a pivot axis. The lower end of the boom has a counterweight connected thereto offset from the pivot axis. The counterweight has a center of gravity which is movable with respect to the pivot axis of the boom. The counterweight can be freely pivotal, fixed, or partially fixed with respect to the boom. When linkage is provided between the counterweight and the boom, the counterweight can be rolled or tilted so as to move the counterweight center of gravity with respect to the pivot axis of the boom.

Abstract: A supplementary weight for ballasting a vehicle can be adapted to be hooked onto a carrier component. The weight includes an entry opening which is bordered by an upper leg and a lower leg. The upper leg is supported on the carrier component which projects into the entry opening. Generally vertical bores extend in the upper leg and the lower leg, and the leg bores are aligned with a corresponding vertical bore in the carrier component. An attaching bolt is received by these bores when the weight is mounted on the carrier component. The attaching bolt has a head, a shank and a threaded section. The attaching bolt is screwed into an axially movable tensioning device which is mounted inside the lower leg, thus clamping the carrier component to the upper leg.

Abstract: A supplementary weight for ballasting a work vehicle includes locating pins which project therefrom. The weight has a pin bore which receives the locating pins and the locating pins are at least partially retractable into the weight. The supplementary weight is preferably comprised of a plurality of partial weights, each having a pin bore extending therethrough, and a central tube is received by the pin bores and couples the partial weights together, the locating pins being adjustably mounted in the central tube. A central tube extends through the pin bore which extends through the supplementary weight, and clamping devices are attached to ends of the central tube for clamping the supplementary weight on the central tube. Recesses are formed in outer side surfaces of the supplementary weight and the clamping devices are located at least partially within the recesses.

Abstract: A camera crane for use in motion picture and television productions, has a mast on a wheeled chassis. A weight bucket on the chassis around the mast securely holds counterweights used to balance arm. The steering section of the mobile base can be pivoted into a low position, to allow the arm to swing around the mobile base, without interference. A leveling system on the mast levels the mast, regardless of the orientation of the chassis. Outriggers are provided as an accessory to help stabilize the mobile base. Stiffening tubes on the arm stiffen the arm and protect the arm core.

Abstract: A counterweight installation and removal apparatus for a truck-mounted crane includes a counterweight having a bottom surface, a plurality of rollers attached to either the bottom surface of the counterweight or to a crane carrier deck, and at least one inclined surface positioned on the other of the bottom surface of the counterweight or the crane carrier deck to engage the plurality of rollers when the counterweight is installed and removed.

Abstract: A large gyroscope adapted to be used in place of, or in addition, to the counterweights normally used on a crane to keep it from tipping when hoisting a load. The gyroscope is of fixed mass such that all road permits and restrictions can be satisfied without stripping the crane. Once on site, the crane will accelerate its gyroscope to a predetermined number of revolutions per minute (steady state). To induce the gyroscopic moment to counter the tipping moment under load, a motor will rotate the gyroscope with respect to the precession axis, thus inducing a gyroscopic moment. Theoretically, any amount of counter weights can be simulated by controlling the precession rotation and spin of this fixed mass gyroscope.