A continuous container crane device may include a first track having a continuous shape and a second track having a continuous shape. Preferably, the first track may be substantially parallel to the second track. One or more trolleys may be movably coupled to the first track and to the second track so that the trolleys are configured to move in a continuous movement path (starts and finishes at the same place) defined by the first and second track. Each trolley may include a lifting mechanism that may be coupled to a container spreader which may be removably coupled to shipping containers for the transport of shipping containers to and from trucks with a chassis trailer, all types of intermodal railroad flat cars, ships and other water traveling vessels, container storage lots, etc.

An upgraded quay crane system and an operation process, wherein a conventional quay crane girder is upgraded into a double-trapezoid four-track girder (1). An upper trolley (2) travels on upper trolley running tracks (a16) on an inner side of the double-trapezoid four-track girder (1), a lower trolley (3) is suspended upside down on lower trolley running tracks (a8) on an outer side of the double-trapezoid four-track girder (1), and a container (5) hoisted by the upper trolley (2) via a hoist (4) is able to pass through the lower trolley (3). The present quay crane system improves on the conventional quay crane having a single operation trolley by adding one more operation trolley on the outer side of the original quay crane girder. The two trolleys are vertically disposed, and the space structure for the lower trolley is cleverly designed, such that the two trolleys can operate independently without interfering with each other. The two trolleys of the upgraded quay crane have enough space to pass by each other and operate at the same time, thereby doubling loading and unloading efficiency.

An upgraded quay crane system and an operation process, wherein a conventional quay crane girder is upgraded into a double-trapezoid four-track girder (1). An upper trolley (2) travels on upper trolley running tracks (a16) on an inner side of the double-trapezoid four-track girder (1), a lower trolley (3) is suspended upside down on lower trolley running tracks (a8) on an outer side of the double-trapezoid four-track girder (1), and a container (5) hoisted by the upper trolley (2) via a hoist (4) is able to pass through the lower trolley (3). The present quay crane system improves on the conventional quay crane having a single operation trolley by adding one more operation trolley on the outer side of the original quay crane girder. The two trolleys are vertically disposed, and the space structure for the lower trolley is cleverly designed, such that the two trolleys can operate independently without interfering with each other. The two trolleys of the upgraded quay crane have enough space to pass by each other and operate at the same time, thereby doubling loading and unloading efficiency.

A control unit causes a lifting unit to perform a lifting operation for raising/lowering a holding unit by executing feedback control for controlling the lifting unit to move a position of the holding unit in a lifting direction closer to a target position while changing the target position, and the control unit executes feedback control with the target position fixed while causing the travel unit to perform a travel operation for traveling along a travel path in a state where the holding unit is holding an article. The control unit reduces a travel operation gain which is a gain of the feedback control during the travel operation to lower than a lifting operation gain which is a gain of the feedback control during the lifting operation.

A lifting device includes a drive, a speed change gear device arranged above the drive and configured to be rotatable by means of the drive, a transmission device connected to the speed change gear device and a lifting mechanism fixed in the transmission device, and the speed change gear device is fixed to a side wall of the transmission device. Under an action of the drive and a speed change of speed change gear device, a gravity of a weight suspended on the lifting device is converted, so that the weight is lifted under a small force. The lifting device can also be driven via an electric hand tool. In addition, a first transmission device and a second transmission device are provided with a safety device to lock the lifting device when reaching a top, so as to prevent the lifting device from slipping to cause injuries.

A transfer assembly for a hoist unit for a patient includes a motor base, a first frame secured to the motor base for rotation about a pitch axis. The first frame includes one or more first suspension wheels rotatably affixed thereto for rotation about a laterally extending axis. The transfer assembly also includes a second frame secured to the first frame for rotation about a yaw axis. The second frame includes one or more second suspension wheels each of which is rotatably affixed thereto for rotation about a laterally extending axis. The transfer assembly also includes a drive wheel assembly rotatably mounted on the motor base for rotation about a laterally extending drive wheel axis. The transfer assembly also includes a motor assembly secured to the motor base and operatively connected to the drive wheel assembly such that operation of the motor rotates the drive wheel assembly.

A frame structure of a hoist, the frame structure including a support frame structure, a bearing wheel arrangement fastened to the support frame structure by suspenders to support the hoist on a main support structure and to move the hoist on the main support structure, whereby the bearing wheel arrangement includes, in the movement direction of the hoist, bearing wheels arranged on opposite sides thereof, and upper sheave arrangements secured to the support frame structure, wherein the support frame structure includes two plates arranged opposite and at a distance from each other, the upper parts of the plates bent towards each other, and in the support frame structure there is arranged an axle passing through both plates, on which axle a sheave is arranged between the plates, and the bent upper parts of the plates are detachably fastenable by a wedge locking to the suspender in order to adjust the mutual distance between the bearing wheels arranged on opposite sides of the support frame structure by means of the suspenders.

A frame structure of a hoist, the frame structure including a support frame structure, a bearing wheel arrangement fastened to the support frame structure by suspenders to support the hoist on a main support structure and to move the hoist on the main support structure, whereby the bearing wheel arrangement includes, in the movement direction of the hoist, bearing wheels arranged on opposite sides thereof, and upper sheave arrangements secured to the support frame structure, wherein the support frame structure includes two plates arranged opposite and at a distance from each other, the upper parts of the plates bent towards each other, and in the support frame structure there is arranged an axle passing through both plates, on which axle a sheave is arranged between the plates, and the bent upper parts of the plates are detachably fastenable by a wedge locking to the suspender in order to adjust the mutual distance between the bearing wheels arranged on opposite sides of the support frame structure by means of the suspenders.

A lifting mechanism includes a lifting beam, a hanging portion suspended below the lifting beam and including a hanging base, a hanging chain, a movable sprocket disposed on the hanging base, a distance adjusting sprocket, and a power mechanism. The distance adjusting sprocket and the power mechanism are arranged side by side and separately on the lifting beam. The power mechanism includes a fixed sprocket and a driving portion. The fixed sprocket is driven by the driving portion to drive the hanging chain to move, so as to lift or lower the hanging portion. An end of the hanging chain is fixed to the lifting beam, and the other end of the hanging chain engages the movable sprocket, the fixed sprocket, and the distance adjusting sprocket, or the other end of the hanging chain engages the movable sprocket, the distance adjusting sprocket, and the fixed sprocket.

A low-construction trolley for a wire rope hoist is arranged to travel along a lower flange of a horizontal rail, on both longitudinal edges thereof. The trolley includes a trolley frame; bearing wheels that are attached to the trolley frame and arranged to travel on an upper surface of the lower flange of the rail; a hoisting mechanism including a rope drum for a hoisting rope, a hoisting member in cooperation with the hoisting rope for hoisting a load, a hoisting motor for driving the rope drum, and a gear to interconnect the hoisting motor and the rope drum; whereby the rope drum is supported to one side of the trolley frame and the hoisting member is arranged to travel under the rail in a vertical plane (A) passing substantially through the middle of the beam. For balancing the trolley without using a counterweight, the hoisting motor is placed under the rail and at least partly on a different side than the rope drum in relation to a vertical plane (B) passing through contact lines of the bearing wheels that touch the lower flange of the rail on the rope drum side.