Abstract: While a crawler body 110 is traveling, infrared sensors 144 and an elevational difference calculator 132 incorporated in a controller 130 detects the magnitude of a step present ahead of the crawler body 110. A safety speed calculator 134 calculates a safety speed based on the magnitude of the step detected and on the position of the platform 116 relative to the crawler body 110, which position is detected by various detectors 141˜143 and by a position calculator 133. A comparator 135 compares this safety speed with the traveling speed of the crawler body 110, and if the current speed of the crawler body 110 is greater than the safety speed, then the comparator 135 outputs a warning signal. Upon receiving this signal, a restrictor 136 controls a valve controller 131 to reduce the speed of the crawler body 110 such that the crawler body 110 can travel over the step safely.

Abstract: A telescopic boom 9 comprises a proximal boom 9a, an intermediate boom 9b, and a distal boom 9c assembled together in a telescopic fashion. A telescopic cylinder 21 is disposed such that a distal end portion of a cylinder rod 21b is firmly attached to a proximal end portion of the proximal boom 9a, whereas a cylinder tube 21a is firmly attached into the intermediate boom 9b. A retraction sheave 25 is mounted to the cylinder tube 21a nearer the proximal end of the telescopic boom 9. An extension sheave 27 is mounted to the cylinder tube 21a nearer the distal end of the telescopic boom 9. A guide pipe 35 is disposed such that one end thereof is firmly attached to the proximal end portion of the proximal boom 9a and the other end is disposed between the retraction sheave 25 and the extension sheave 27.

Abstract: A mobile vehicular apparatus includes an aerial control cabin mounted on a tip end of a telescopic boom by a vertical shaft for turning movement about the vertical shaft, and an aerial working device disposed in front of the aerial control cabin. The aerial control cabin is movable back and forth with respect to the boom by a slide mechanism. The slide mechanism includes a guide base mounted on the vertical shaft for turning movement thereabout, a slider mounted on the guide base so as to be movable back and forth with respect to the guide base, and an actuator for sliding the slider with respect to the guide base, the aerial control cabin being coupled to the slider.

Abstract: A mobile vehicular apparatus for moving an operator around a three-dimensional aerial work location includes a mobile vehicle having a vehicle body, a boom upwardly extensibly and downwardly collapsibly mounted on the vehicle body, a platform mounted on a distal end of the boom, and a manipulator mounted on the distal end of the boom in electrically insulated relation to the platform. The platform and the manipulator are electrically insulated from each other, and hydraulically operated generators are disposed respectively on the platform and the manipulator for energizing respectively electric systems mounted thereon. The electric systems on the platform and the manipulator are interconnected by an optical fiber cable.