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Tensioning roller device

  • US 7,758,459 B2
  • Filed: 10/02/2007
  • Issued: 07/20/2010
  • Est. Priority Date: 10/03/2006
  • Status: Expired due to Fees
First Claim
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1. A tensioning roller device comprising:

  • a non rotating central journal part,a pulley forming assembly, designed to support a belt or a chain on an external cylindrical grip surface of the assembly, the assembly being rotatably mounted around the journal part by means of a bearing, said bearing comprising a non rotating ring assembled to the non rotating part, a rotating ring belonging to the pulley assembly, and rolling elements between the two rings;

    wherein the pulley forming assembly comprises;

    a first sheath part assembled to the rotating ring, defining a first circumferential flange, and defining a guiding axial surface;

    a second sheath part assembled around the guiding axial surface of the first sheath part, so as to slide axially along this guiding axial surface, the second sheath part defining a second circumferential flange;

    a frustoconical or cylindrical base surface coaxial to the guiding axial surface, with a minimum diameter larger than the diameter of the guiding axial surface, the base surface pertaining either to the first or to the second sheath part and being placed between the two flanges;

    a sheath inner sleeve of annular shape, assembled around the base surface, between the first and the second flange, the axial section of the sleeve being limited by a quadrilateral polygon having at least a pair of non parallel opposite sides, a first inner surface of the sleeve resting on the base surface, a second, outer surface of the sleeve providing support to the belt or chain, the sleeve being expandable radially when compressed axially by the flanges along the third and fourth lateral surfaces of the sleeve; and

    an elastic element exerting an elastic force to move the first flange and the second flange towards each other, thus compressing axially the sleeve and expanding it radially, so that the final external diameter of the sleeve results from a balance between a radial compression of the sleeve between the chain or belt and base surface, and an axial compression exerted on the lateral surfaces of the sleeve by means of the elastic element.

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