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Knuckle boom crane arms are much lighter than boom truck cranes, and they are designed to allow for more payloads to be carried on the back of the truck that it is mounted on. The majority of them are mounted behind the cab and leave the entire bed of the truck empty.
Rear steer system. With this system, a grapple loader is mounted on the rear of a short frame chassis with an operator's cab mounted between loader and chassis cab.The loader is operated from this cab, and all driving controls are also routed to the operator's cab enabling the "rear steer" unit to drive backwards along the route and load into separate haul trucks.
A mobile crane is a cable-controlled crane mounted on crawlers or rubber-tired carriers or a hydraulic-powered crane with a telescoping boom mounted on truck-type carriers or as self-propelled models. [1] They are designed to easily transport [2] to a site and use with different types of load and cargo with little or no setup or assembly.
A loader crane (also called a knuckle-boom crane or articulating crane) is an hydraulically powered articulated arm fitted to a truck or trailer, and is used for loading/unloading the vehicle cargo. The numerous jointed sections can be folded into a small space when the crane is not in use.
When used as a loader the single boom (rather than twin arms) is very highly loaded and is a weakness, even with careful design. A vehicle which has a 5,000 lb (2,300 kg) lift capacity with the boom retracted may be able to safely lift as little as 400 lb (180 kg) with the boom fully extended at a low angle.
Corbitt, a small company which had sold the US Army trucks since 1917, was working on designs for heavy-duty conventional 6x6s trucks. In 1940 their designs for a 6-ton truck and a 10-ton wrecker chassis were standardized, with Corbitt to build 6-ton cargo trucks, while the 10-ton wreckers were contracted to Kenworth Motor Truck Corp. and Ward ...