46 connected to a pair of cables 48 which in turn are connected to a lift cable 50 the pull lines 28 may be similarly secured to a pull cable not shown both the lift and pull cables are controlled by a crane or the like in the preferred method of operation the bucket 10 is dragged over the earth by the pull lines 28 until the interior of the bucket 10 is loaded with dug earth the lift cable 50 and lift lines 26 are then used to lift the entire bucket 10 in order to clear it from obstacles as it is swung by the supporting crane to the location where the earth is to be dumped the combination of the tension of the lift lines 26 and the pull lines 28 together with the weight of the loaded bucket 10 acting effectively at its center of gravity create a net moment force around the coaxial pivots 22 which keeps the link plates 20 against the stops 40 as shown in fig1 when the bucket 10 is to be dumped the pull lines 28 are slacked causing the opposing moment exerted on the link plates 20 by the lift lines 26 to be to be greater than the moment exerted by the pull lines 28 this causes the link plates 20 to pivot to the position shown in fig3 against the other stops 38 which causes the bucket 10 to dump this change in net moment results not only from the different forces exerted by the lines 26 28 but.