US 12,296,505 B2
Rotor with anti-wear device and fixation system
Bruno Dussardier, Clermont-Ferrand (FR); Cedric Carlavan, Clermont-Ferrand (FR); Yves Liais, Clermont-Ferrand (FR); and Crescence Weber, Clermont-Ferrand (FR)
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
Appl. No. 17/631,697
Filed by COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
PCT Filed Jul. 7, 2020, PCT No. PCT/EP2020/069058
§ 371(c)(1), (2) Date Jan. 31, 2022,
PCT Pub. No. WO2021/018521, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 1908853 (FR), filed on Aug. 1, 2019.
Prior Publication US 2022/0266475 A1, Aug. 25, 2022
Int. Cl. B29B 7/18 (2006.01); B29B 7/74 (2006.01); B29B 7/22 (2006.01)
CPC B29B 7/186 (2013.01) [B29B 7/7495 (2013.01); B29B 7/22 (2013.01); B29B 7/7461 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A rotor for use in an internal mixer having a mixing vessel in which the rotor rotates, the rotor comprising:
one or more blades, each blade having a tip with a profile having a predefined curvature;
an anti-wear device detachably fixed to the tip of at least one blade, the anti-wear device comprising a plate with a profile defined by a lower surface with a curvature complementary to that of the tip and an upper surface with a curvature complementary to that of a wall of the vessel to define, between them, a zone of minimum gap that allows a passage of a mixture between the plate and the wall of the vessel; and
one or more fastening systems positioned and tightened relative to the plate in order to engage the rotor,
wherein each fastening system comprises:
a retaining screw comprising:
an elongated substantially cylindrical screw head with a circumferential surface corresponding to a diameter of a counterbore of the plate into which the retaining screw is inserted, the screw head extending along a predetermined length between an engaging end, where an engagement surface is defined for engaging a shoulder of the counterbore of the plate, and an access end, the screw head with an insertion channel extending along the length of the screw head with a predetermined cross-sectional geometry; and
a substantially cylindrical elongated screw shank extending from the engagement surface of the screw head, the screw shank with a predetermined diameter being held in a corresponding rotor thread in which the retaining screw is mounted, the screw shank extending along a predetermined length between an insertion end, where the screw shank receives a clamping means passing to the insertion channel of the screw head, and an opposite end fixed in the rotor, the screw shank with a mounting conduit extending along the length of the screw shank; and
a clamping means comprising a central pin, the central pin comprising:
a plug with a cross-sectional geometry corresponding to the predetermined cross-sectional geometry of the insertion channel of the screw head, the plug extending along a predetermined length between an engaging end, where an engaging surface of the plug is defined to engage against a shoulder of the insertion channel of the screw head, and an opposite outer end; and
a substantially cylindrical elongated rod extending from the engagement end of the plug, the rod having a predetermined diameter corresponding to the mounting conduit of the screw shank for mounting the central pin therein.