Abstract: An overhead crane supported by a derrick, comprising a frame coupled to the derrick and comprising a pair of rail members and a bridge member coupled between the rail members, and a trolley coupled to the frame and comprising a fairlead assembly and a cable guide movable in an X-Y plane within an inner perimeter of the frame.

Abstract: The invention concerns a mobile crane with a drivable undercarriage and a rotatable superstructure mounted thereon, where on the one side there is pivoted a swiveling jib, and on the other side a counterweight arrangement is mounted which is movable relative to the superstructure. According to the invention, the counterweight arrangement has a counterweight base plate, on which at least two stacks of counterweights are arranged and able to swivel about a vertical axis.

Abstract: A mobile crane having a main jib that is mounted thereupon for luffing and that can be oriented by means of a luffing cylinder, and a main jib extension which is detachably connected to a main jib head of the main jib by upper and lower bolts, it being possible to angle the main jib extension about a luffing axis relative to the main jib proceeding from a base position following release of the upper or lower bolts and using an angle drive, the angle drive engaging with a foot of the main jib extension, a maximum angling angle being delimited by an adjustable angling plate, and the angling plate engaging with the foot of the main jib extension and the main jib head. The angle drive is a component of an angling plate in the form of a combi-angling plate.

Abstract: A mobile crane having a main jib that is mounted thereupon for luffing and that can be oriented by means of a luffing cylinder, and a main jib extension that is detachably connected to a main jib head of the main jib by means of upper and lower bolts, it being possible to angle the main jib extension about a luffing axis relative to the main jib proceeding from a base position following release of the upper or lower bolts and using an angle drive, the angle drive engaging with a foot of the main jib extension, a maximum angling angle being delimited by an adjustable angling plate, and the angling plate engaging with the foot of the main jib extension and the main jib head. The angle drive may be a component of an angling plate in the form of a combi-angling plate.

Abstract: A mobile crane having a tiltably mounted main jib which can be erected by a tilting cylinder, and having a main jib extension releasably connected to a main jib head of the main jib by upper and lower bolts. Starting from a normal position, after release of the upper bolts, the main jib extension can be angled about a tilting axis relative to the main jib by an angling drive that engages on a foot of the main jib extension, and a drive that is provided for another purpose supplies the kinetic energy for the angling drive. The angling drive includes a lever element having two lever arms, pivotably mounted on the upper chord of the main jib extension, with the first lever arm being connected to a lifting cable of the lifting gear for operation of the angling drive and engaging the main jib head by the second lever arm.

Abstract: A rope routing step and a raising step are executed. In the rope routing step, in a state where a raisable and lowerable member and a boom are laid down, a raising rope is coupled to the raisable and lowerable member and routed to extend rearward of the raisable and lowerable member. In the raising step, the raising rope is wound up rearward to raise the raisable and lowerable member. In the rope routing step, the raising rope is routed to pass between a lower restriction section and an upper restriction section of a rope support member, and in the raising step, the raising rope is wound up rearward with a vertical movement of the raising rope restricted by the upper restriction section and the lower restriction section.

Abstract: An object of the present invention is to provide a simple-structured tensioner capable of consistently exhibiting the check valve function irrespective of the form of oil supply passages. The tensioner includes a plunger, a housing, a biasing unit, an oil supply passage, and a check valve. The check valve includes a plurality of valve members and a ball seat member. The ball seat member includes a plurality of oil passages and a plurality of seat parts. The check valve further includes a passage forming member having an oil inlet disposed between the plurality of oil passages and the oil supply passage.

Abstract: Disclosed is a technique of executing: a fixing step of coupling a pulling-raising rope 171 to a vicinity of a distal end 73 of a strut 70; a first raising step of pulling the pulling-raising rope 171 rearwardly to cause a swingable portion 78 of the strut 70 to swing upwardly and rearwardly; a second raising step of pulling the pulling-raising rope 171 rearwardly until a strut body portion 76 has a rearwardly inclined posture with respect to a vertical direction; a strut returning step of pulling a pulling-returning rope 23a forwardly to a position where a forward swinging movement of the swingable portion 78 with respect to the strut body portion 76 is restricted; and a coupling step of coupling the swingable portion 78 and the strut body portion 76 to each other in a non-swingable manner.

Abstract: The present invention relates to a crane, in particular to a revolving tower crane, having a boom rotatable about an upright slewing gear axis by a slewing gear drive and having an out-of-operation brake which allows and brakes rotary movements of the boom in the out-of-operation state. In accordance with the invention, the out-of-operation brake is configured as working electrodynamically and comprises an electric motor of the slewing gear drive which can be operated as an electric-motor brake.

Abstract: A deck hoist tractor (DHT) for an unmanned platform (1) comprising an elongated base frame structure (12) carrying respective caterpillar drives (18) on each side enabling the tractor (2) to move forward and rearward, characterised in that the tractor (2) further comprising a tower frame structure (10) extending in substantially vertical direction from one end section of the base frame structure (12), which tower frame structure (10) is carrying a cantilevered top frame structure (11) carrying a lifting apparatus (22, 21), said caterpillar drives (18) are located at the same end section as said top frame structure (11), that said base frame structure (12) is extended by respective cantilevered beams (12a) space apart with an opening between them, each cantilevered beam (12) having an adjustable support structure (19) adjacent to their distal end (12b) from the caterpillar drive (18), said cantilevered top frame structure (11) is extended to vertically correspond with said respective cantilevered beams (12a),

Abstract: A compressible stop for use in a crane has a housing, a rod slidably mounted within the housing, a floating piston, and a valve assembly. The floating piston divides the housing into a gas portion biasing the floating piston towards an end of the housing and a liquid portion containing a hydraulic fluid. The valve assembly divides the liquid portion into a support portion and a reserve portion. The valve assembly includes a check valve allowing a liquid to flow from the reserve portion into the support portion, a pressure sensitive valve inhibiting the liquid from flowing from the support portion into the reserve portion unless the pressure is above a threshold pressure, and a frangible divider configured to rupture when the liquid pressure exceeds a rupture pressure.

Abstract: A bicycle derailleur comprises a base member adapted to be mounted to a bicycle; a movable member movably coupled to the base member; a chain guide coupled to the movable member through a pivot shaft for rotating around an axis (X); a spring mounted around the axis (X), wherein the spring is configured to bias the chain guide in a selected rotational direction; and a resistance applying unit disposed on the pivot shaft. The resistance applying unit includes a friction unit, a one-way transmission unit, and an adjusting unit. The friction unit includes a plurality of first engaging members and at least one second engaging member, wherein the plurality of first engaging members are axially slidable with respect to the pivot shaft. The adjusting unit adjusts an amount of friction between the plurality of first engaging members and the at least one second engaging member.

Abstract: Drive belt systems and methods thereof are disclosed. Drive belt systems and methods thereof include driving a continuous belt around a drive pulley member and an idler pulley member by the drive pulley member and transporting a transport unit and/or reciprocating carriage unit coupled to the continuous belt in a first direction away from the drive pulley member. Drive belt systems and methods thereof also include applying at least a force to the belt in a traverse direction thereto to direct a portion of the belt about the drive pulley member by a belt stretch management apparatus coupled to the transport unit and/or reciprocating carriage unit.

Abstract: An embodiment is directed to a slider and method for moving a hoist on a crane. The slider includes a hoist support member and mounting arms. The mounting arms extend from either end of the support member. A portion of each mounting arm is spaced from the support member to form a flange receiving slot which is dimensioned to receive a flange a beam of the crane. The slider is provided with a resilient member to resiliently maintain the slider in a position in which the slider is movable relative to a beam of the crane when no load is applied to the slider. The resilient member is compressed when a load is applied to the slider to allow the slider to frictionally engage the beam to prevent the slider from continued movement relative to the beam.

Abstract: A jib coupling system a stowage coupling assembly having a locking member movable between a retracted position and an extended position, an extension pivot coupling system having a coupling member movable between a retracted position and an extended position, and a cable having a first end operably connected to the locking member and a second end having a locking pin. Movement of the locking member from the extended position to the retracted position causes the locking pin to engage the coupling member, and movement of the locking member from the retracted position to the extended position causes the locking pin to disengage the coupling member. The jib coupling system may be implemented as a part of a boom assembly and on a boom assembly of a mobile crane.

Abstract: A variable transmission system for a vehicle is configured such that, when a magnitude of a hydraulic pressure detected by an hydraulic pressure sensor is a first predetermined value or more, a chord portion of a chain belt is pressed such that a raceway length of the chain belt is extended by at least a circumferential extension amount of the chain belt at the time when the magnitude of the hydraulic pressure is the first predetermined value. Hereby, it is possible to restrain the chain belt from coming off from a sheave even in a low vehicle speed range, at a low cost, without causing a fuel efficiency decrease and a driving torque decrease of the vehicle.

Abstract: A self-maintaining crane system including a bridge, a trolley, a hoist, and sensors for use within a hostile environment, such as a wastewater treatment facility, is presented. The bridge is movable away from the bridge home position and back toward the bridge end position. The trolley is movable away from the trolley home position and back toward the trolley end position. The cable is extendable away from the hoist home position and retractable toward the hoist end position. The sensors separately determine whether the bridge, trolley, and cable engage a home position and end position. Sensors facilitate automated movement of bridge, trolley, and cable so as to minimize functional impairment of the crane system by the hostile environment.

Abstract: A marine knuckle boom crane includes a crane housing which is rotational relative to a pedestal about a vertical rotation axis and a knuckle boom assembly attached to the crane housing. The knuckle boom assembly includes a main boom, the inner end of which is connected pivotably about a first horizontal pivot axis to the crane housing; and a jib, the inner end of which is connected pivotably about a second horizontal pivot axis to the outer end of the main boom, wherein the jib is pivotable at least between an extended position in which the tip extends mainly forward from the main boom, and a folded position in which the jib is folded back, essentially parallel along the main boom. In order to position the jib with respect to the main boom, a tensioning member is provided extending between the crane housing and a curved extension guide connected to the jib.

Abstract: A variable span A-frame outrigger includes a support having a first pivoting mount and a second pivoting mount. The first pivoting mount is pivotably connected to an outrigger leg having an upper segment and a lower segment that extends from the upper segment. The lower segment has a first plurality of connection points for connection to an intermediate member. The second pivoting mount is pivotably connected to the intermediate member having a second plurality of connection points. A connector connects a connection point of the first plurality of connection points to a connection point of the second plurality of connection points.

Abstract: A crane includes a base structure; a slew bearing; a crane housing; a boom moveably mounted to the crane housing to be pivotable about a horizontal first pivot axis; three main hoisting systems; and a luffing system. The boom includes an A-frame with two boom legs that are connected at one end to the crane housing and at the opposite end to each other. Each main hoisting system includes a hoisting cable; a sheave block; a hoisting block; and a hoisting winch. The sheave block of each main hoisting system is pivotable about a horizontal second pivot axis that is perpendicular to the sheave rotation axis. The sheave blocks of the three main hoisting systems are arranged side-by-side. The luffing system includes two luffing winches; and two luffing cables extending between the respective two luffing winches. The luffing cables are connected to respective outriggers of the hammerhead structure.