Method and device for connecting a wear part to the support thereof on material handling devices on heavy construction machinery

Device for connecting a wear part to a support on materials handling equipment for public works machines, including a tooth for fining on an adapter, and their linkage with a sleeve made from elastically deformable material and a key, the tooth and the adapter being profiled with openings and zones for accommodating said sleeve and the key, the key being introduced into the sleeve and projecting beyond ends of the sleeve, the key being placed in an axial alignment with regard to the sleeve with a misalignment effect, the sleeve being placed in part of the adapter,

• wherein said key comprises a rigid, monolithic, cylindrical key having an elongated body with a key foot and a key head on respective opposite ends of the body, the body is installed in the sleeve while the key head projects beyond the sleeve,
• the key head includes a part forming an off-centered seat performing a support and thrust function against a matching shape in a first orifice of the tooth, and beyond the part, a relief zone with one or more notches for attaching a disassembly tool,
• the end of the key head is rotatable by operating means,
• the key foot comprises anchoring means to penetrate temporarily into the elastically deformable sleeve by a first tightening action of a predefined value, said anchoring means comprising a first zone having an arrangement of hollow and relief shapes for temporarily anchoring the key in the sleeve,
• and an end of the key foot is arranged with a final frustoconical portion to bear against a second orifice of the tooth as part of a tightening action greater than the first tightening action and resulting from rotation of the key, wherein the installed key is freely orientable in rotation and direction, and rotation of the key causes misalignment of the key with regard to an initial axis and the tight securing of the key, in the sleeve by anchoring of the first zone, and, upon further key rotation, against metal parts of the tooth and of the adapter on differentiated support zones, whereby adjustment of retention force of the key on the linkage in situ is provided, and wherein the tooth is connected and disconnected from the adapter without striking operations.