Spoon digging machines of walls of rectangular screen and cuttings, and machine equipped with such a spoon

摘要

Invention patent: b "spoon digging machines of walls of rectangular screen and cuttings, and machine equipped with such a spoon" d .The spoon comprises two rollers (11, 12) of the support against the walls of the hole (4) that the spoon is digging, and devices for moving the blades (11),12) between a position retracted in the housing (1) and an extended position in which are pressed against the walls of the hole (4).Preferably, the blades (11, 12) are automatically when the spoon reaches the bottom of the hole (4). The machine of the invention has a spoon of this type.Without increasing the volume and weight of the spoon or the machine, it is possible to exert a force of excavation is very high.