Patents Assigned to MAI S.p.A.
  • Patent number: 5511870
    Abstract: The rubber vehicle track comprises a rubber structure (1) exhibiting on an external surface a series of shaped reliefs (2) and on an internal surface a series of metal rail tracts (4) partially sunk into the rubber structure (1), projecting from said structure (1) and aligned one to another in at least one line to form a rigid rolling surface for vehicle rollers. Each rail tract (4) exhibits a longitudinal extension (6), made in rubber or in another elastic material, forming a single body with and being taller than the rail tract (4), and having a convex top surface. The rubber extension (6) is separated from a contiguous rail tract (4) by a recess (7) cut perpendicular to a lie plane of the internal surface of the rubber structure (1).
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: April 30, 1996
    Assignee: Mai S.p.A.
    Inventor: Renato Mai
  • Patent number: 5221392
    Abstract: The described process comprises the following operating steps: an extrusion step in which the raw rubber is extruded in the form of a strip (7) from an appropriate machine (1); a winding step in which the rubber strip (7) is wound about a rotating drum (2); an insert application step in which steel insert pieces (16) are applied to the rubber layer wound about the rotating drum (2); a second winding step in which the rubber strip (7) is wound on the steel insert pieces (16); a coiling step in which a steel wire (4) is wound into spiral shape on the rubber layer wound about the rotating drum (2); a third winding step in which the rubber strip (7) is wound on the coiled steel wire (4) as far as a product in the form of a ring is achieved; a removal step in which the ring-shaped produce is removed from the drum (2); an introduction step in which the ring-shaped product is introduced into a mold; a forming and vulcanization step carried out on the product in the mold; an extraction step in which the ready track i
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: June 22, 1993
    Assignee: MAI S.p.A.
    Inventor: Renato Mai