Frumecar concrete mixers history.
The result was a circular mixer, with arms and paddles to mix the raw materials. Truck leaf springs were used to support the abrasion of the materials, while for the rotation they adapted the differential group from one Ford Canada (Canadian Military Pattern Truck), a vehicle used for the Commonwealth soldiers during the Second World War. It was necessary to modify and to cut one of the sides, as well as to weld the differential gears in order to separate one axle shaft. To couple the mixing arms they used the wheel hub.
To obtain the appropriate rotational speed for a homogenous mixing process, it was necessary to couple to the differential transmission a pulley operated by an electrical motor, getting a final speed of 28 rpm. This was the origin of RUMBO mixer.
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