Abstract: A jib crane which can prevent an unexpected movement of a burden and can sufficiently ensure the safety of a burden handling work is disclosed. The jib crane has hoisting wire ropes for lifting and landing a hook, derricking wire ropes for derricking operation of a jib, and a conversion device for fixing tips of the wire ropes to a revolving frame of a revolving table. The conversion device has a V-shaped link pivotally supported on a bearing bracket via a pivot pin. The tips of the wire ropes are connected to paired link arms of the V-shaped link.

Abstract: A jib crane is provided which can prevent an unexpected movement of a burden and can sufficiently ensure the safety of a burden handling work. The jib crane has hoisting wire ropes 22 for lifting up and down of a hook 34, derricking wire ropes 24 for derricking operation of a jib 14 and a conversion device 38 for fixing tips of the wire ropes 22 and 24 to a revolving frame 58 of a revolving table. The conversion device 38 has a V-shaped link 62 pivotally supported on a bearing bracket 56 via a pivot pin 60. The tips of the wire ropes 22 and 24 are connected to paired link arms 62a and 62b of the link 62.

Abstract: Drums each having an independent drive source is installed on a trolley and each of the drums has a lifting rope which is wound around it and has an unwound end locked on a suspension piece, which will suppress any need to design the lifting rope in longer length and the drums in larger size. Sun gears, carriers and planetary gears disposed in each of the drums as well as internal teeth in each of the drums so as to be integrally rotated with the drum constitute a speed reducing mechanism for transmitting rotation of a drive source to each of the drums, will enable the entire hoist to be compact in size. Unwound length of the lifting rope from each drum is adjusted to control posture of the suspension piece and load in adequate state.

Abstract: A stationary frame is in the form of a box body by which mutually telescopic lateral extension frames are slidably supported, thereby providing a spreader which is light in weight and has no bent or torsion of the extension frames. Support of the extension frames by the support rollers mounted on the opposite ends of the stationary frame reduces the drive force upon extension or contraction of the extension frames, and provision of the rail and cushioning member between the extension frames and the stationary frame reduces the impact load applied on the extension frames when the spreader is hoisted down onto the container.

Abstract: A stationary frame is in the form of a box body by which mutually telescopic lateral extension frames are slidably supported, thereby providing a spreader which is light in weight and has no bent or torsion of the extension frames. Support of the extension frames by the support rollers mounted on the opposite ends of the stationary frame reduces the drive force upon extension or contraction of the extension frames, and provision of the rail and cushioning member between the extension frames and the stationary frame reduces the impact load applied on the extension frames when the spreader is hoisted down onto the container.

Abstract: A stationary frame (20) is in the form of a box body (28) by which mutually telescopic lateral extension frames (21, 22) are slidably supported, thereby providing a spreader (16) which is light in weight and has no bent or torsion of the extension frames. Support of the extension frames (21, 22) by the support rollers (37) mounted on the opposite ends of the stationary frame (20) reduces the drive force upon extension or contraction of the extension frames (21, 22), and provision of the rail (43) and cushioning member (44) between the extension frames (21, 22) and the stationary frame (20) reduces the impact load applied on the extension frames (21, 22) when the spreader (16) is hoisted down onto the container (4).

Abstract: A jib is supported for its luffing movement by a luffing rope mounted to a longitudinally intermediate portion of the jib. The jib has a truss structure with upper and lower beam members respectively overhanging upward and downward of load action line which connects a lifting point with a support pin.

Abstract: A stationary frame is in the form of a box body by which mutually telescopic lateral extension frames are slidably supported, thereby providing a spreader which is light in weight and has no bent or torsion of the extension frames. Support of the extension frames by the support rollers mounted on the opposite ends of the stationary frame reduces the drive force upon extension or contraction of the extension frames, and provision of the rail and cushioning member between the extension frames and the stationary frame reduces the impact load applied on the extension frames when the spreader is hoisted down onto the container.

Abstract: A stationary frame (20) is in the form of a box body (28) by which mutually telescopic lateral extension frames (21, 22) are slidably supported, thereby providing a spreader (16) which is light in weight and has no bent or torsion of the extension frames. Support of the extension frames (21, 22) by the support rollers (37) mounted on the opposite ends of the stationary frame (20) reduces the drive force upon extension or contraction of the extension frames (21, 22), and provision of the rail (43) and cushioning member (44) between the extension frames (21, 22) and the stationary frame (20) reduces the impact load applied on the extension frames (21, 22) when the spreader (16) is hoisted down onto the container (4).

Abstract: A jib is supported for its luffing movement by a luffing rope mounted to a longitudinally intermediate portion of the jib. The jib has a truss structure with upper and lower beam members respectively overhanging upward and downward of load action line which connects a lifting point with a support pin.

Abstract: A continuous unloader includes upper sprockets, lower sprockets located below the upper sprockets, and front sprockets located in front of the lower sprockets. An endless bucket conveyer is operatively taken on the upper, lower and front sprockets. A support frame supports the upper sprockets. An elevation/lowering mechanism is provided at a lower end of the support frame. A base part is operatively connected to the lower end of the support frame by way of the elevation/lowering mechanism such that the base part is raised and lowered by the elevation/lowering mechanism relative to the support frame. A link mechanism is connected to the front and lower sprockets such that the front and lower sprockets are lowered when the distance between the front and lower sprockets is narrowed and the front and lower sprockets are raised when the distance between the front and lower sprockets is widened.

Abstract: A continuous unloader has a vertically extending elevator portion having a bottom and a top, a digging portion extending horizontally from the bottom of the elevator portion and a return portion extending from the top of the elevator portion to a free end of the digging portion thereby forming an endless route. The continuous unloader further includes: an endless bucket conveyer extending through the endless route; and a plurality of drive components provided on the bucket conveyer with predetermined intervals in the direction of circulation. The drive components are synchronously operated so that the conveyer be circularly driven.