Abstract: An arrangement in industrial trucks of the kind which include a chassis (3) carried by support wheels (5, 6) which lack spring suspension, and driven by a sprung drive-wheel (7) arranged between two support wheels. A hydraulically operable load carrying device (2) is provided for lifting primarily goods-laden pallets. The sprung movement of the drive-wheel (7) relative to the chassis is effected with the aid of a spring assembly (22) which includes link arms (25, 26) and a spring (24) both being arranged between the chassis and the drive-wheel. The spring (24) includes a hydraulic working piston-cylinder device (27) by means of which the spring assembly can be given a desired spring bias or spring force. The piston-cylinder device is connected to the hydraulic system of the load carrying device in a manner to increase automatically the spring bias, and therewith the pressure exerted by the drive-wheel against the floor or like surface when the load carried increases.

Abstract: An arrangement in industrial trucks of the kind which include a chassis (3) carried by support wheels (5, 6) which lack spring suspension, and driven by a sprung drive-wheel (7) arranged between two support wheels. A hydraulically operable load carrying device (2) is provided for lifting primarily goods-laden pallets. The sprung movement of the drive-wheel (7) relative to the chassis is effected with the aid of a spring assembly (22) which includes link arms (25, 26) and a spring (24) both being arranged between the chassis and the drive-wheel. The spring (24) includes a hydraulic working piston-cylinder device (27) by means of which the spring assembly can be given a desired spring bias or spring force. The piston-cylinder device is connected to the hydraulic system of the load carrying device in a manner to increase automatically the spring bias, and therewith the pressure exerted by the drive-wheel against the floor or like surface when the load carried increases.

Abstract: A method for detecting obstacles, such as people for example, in the operation of remote-controlled vehicles (10). The vehicle may be an industrial materials-handling truck or an industrial robot equipped with a data processing control system and transmitters (20,22) and receivers (24) for ultra-sound waves. Ultra-sound pulses are transmitted continuously in groups from the transmitter in a pre-determined pattern, and only one input signal having a pulse pattern corresponding to the aforementioned predetermined pattern for respective pulse groups is received by the receiver (24) and evaluated by the data processor for controlling maneuvering of the vehicle (10).

Abstract: An hydraulic tensioning tool for tensioning reinforcing cables, rods or like devices in concrete structure. A first working piston-cylinder device (21) is arranged to effect the actual work of tensioning the cable, while a second working piston-cylinder device (22) causes the cable to be anchored to a cable lock (12). The first device (21) includes a tensioning cylinder (23) and a tensioning piston (24) having mounted on the outer free end (25) thereof a readily removed cable holder (14). The tensioning cylinder (23) of the first piston-cylinder device and the locking cylinder (27) of the second piston-cylinder device (22) are accommodated in a common cylinder housing (11), although separated by a partition (29) which forms the bottoms of respective cylinders, such that the tensioning piston (24) and the locking piston (26) for the cable lock (12) are movable in mutually opposite directions during their respective working strokes.