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One more type of Boom Truck is known as a Bucket Truck. It has a bucket attachment along with an expandable arm and specializes in hoisting people, normally personnel high up in the air. Bucket Trucks are also called Aerial Boom Trucks. They have a lifting capacity of 150 kg to 700 kg and the bucket itself could be expanded up to 10 meters in the air.
Knuckle Boom Trucks are much larger lift vehicles that are equipped with a crane on the back of the machinery. If the length of the vehicle is lengthened, then the truck becomes a Trolley Boom Truck. These kinds of lift trucks have a lifting capacity of 10 tons to 50 tons.
A Concrete Boom Truck is yet one more kind of Boom Truck which has a huge container on its back that is made so as to carry concrete and expandable pipe. Concrete is pumped with the pipe into a specific location. Concrete Boom Trucks can be lengthened up to 70 meters.
The fluid coupling unit is actually the most popular type of torque converter used in auto transmissions. In the 1920's there were pendulum-based torque or Constantinesco converter. There are various mechanical designs for always variable transmissions that could multiply torque. For example, the Variomatic is one version that has a belt drive and expanding pulleys.
A fluid coupling is a 2 element drive which cannot multiply torque. A torque converter has an extra element that is the stator. This alters the drive's characteristics during occasions of high slippage and generates an increase in torque output.
In a torque converter, there are at least of three rotating elements: the turbine, to drive the load, the impeller that is driven mechanically driven by the prime mover and the stator. The stator is between the impeller and the turbine so that it could change oil flow returning from the turbine to the impeller. Normally, the design of the torque converter dictates that the stator be stopped from rotating under any condition and this is where the word stator begins from. Actually, the stator is mounted on an overrunning clutch. This design prevents the stator from counter rotating with respect to the prime mover while still enabling forward rotation.
