US Patent 7647713 Bucket or scoop with adjustable capacity

A bucket or scoop with adjustable capacity has a fixed structure which forms an external rigid element and also has one or several mobile elements, complementary to the fixed structure, which slide inside the same by means of special devices. The special devices are actuators or pistons fixed either to the fixed structure or to the mobile elements, to occasion a reciprocal movement thereof. Sliding guides are arranged parallel to the direction of action of the pistons.