| (57) This invention concerns a cutter bucket (10) able to work in any kind of ground and
to make ditches, trenches, wells, excavations for partition walls, etc. which comprises:
- excavation means (12) consisting of two pairs of rotatable tools (13) having their
axes parallel to each other and substantially parallel to the excavation face (24),
such tools (13) being provided peripherally with means (26) to attack the earth, the
means (26) to attack the earth of one pair of tools passing near the means (26) to
attack the earth of the other pair,
- hydraulic motor means (20) arranged above the excavation means (12),
- chain means (25) driven by the hydraulic motor means (20) and driving the excavation
means (12) by an inner gear wheel (15), the chain means (25) being provided with independent
means (26) to attack the ground, and
- pneumatic means (28) to withdraw debris, in which cutter bucket (10) the hydraulic
motor means (20) comprise on their outer periphery ring gear means (23) to drive the
chain means (25), and the means (26) to attack the ground, being supported by the
chain means (25) and by the rotatable tools (13), form a substantially continuous
excavation face (24) stretching at least to the periphery of the cutter bucket (10).
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