초록 ▼

A mobile aerial device, which also has deployable outriggers, has sensors for the outrigger-supported weight, sensors for boom azimuth, elevation and extension, and sensors for other boom conditions. An on-board digital computer is programmed with load tables for the device. The various sensor signa

A mobile aerial device, which also has deployable outriggers, has sensors for the outrigger-supported weight, sensors for boom azimuth, elevation and extension, and sensors for other boom conditions. An on-board digital computer is programmed with load tables for the device. The various sensor signals and load table data are computer-processed to determine the approach of tipping or overload conditions. When operating near a dangerous obstacle which it is desired to avoid, the boom is initially caused to assume certain preparatory positions relative to the obstacle and data are computer-generated which extrapolate from these positions a region in space which represents a prohibitively close approach of the boom to the obstacle. The foregoing information is used to alert the operator to the approach of a dangerous condition and also to prevent the crane from performing movements which could cause tipping or which would encroach upon the prohibited region.

대표청구항 ▼

A method for operating an aerial device including a carrier and a boom pivotally associated with said carrier, said carrier including a plurality of stabilizing supports, said boom having means for moving with respect to said carrier, and end portions of said boom including means for suspending an a

A method for operating an aerial device including a carrier and a boom pivotally associated with said carrier, said carrier including a plurality of stabilizing supports, said boom having means for moving with respect to said carrier, and end portions of said boom including means for suspending an article from said boom, which method comprises the steps of: sensing loading on the boom; sensing distribution of the loading of the boom on the plurality of stabilizing supports of the carrier; determining when said distribution approaches a condition in which there is a danger of boom tipping by comparing decreases in the loading of the boom on the plurality of stabilizing supports, responsive to changes in azimuth, elevation and extension of the boom, with load charts indicating safe operating limits for said aerial device; and providing an alert signal when the comparison approaches the safe limits of aerial device operation as defined by the load charts.