Abstract: A tire pattern of a tread intended to be fitted on a tire and including a plurality of elements in relief intended to come into contact with the ground on which the tire fitted with such a tread travels. At least one element in relief having at least one lateral wall undercut relative to the running surface of the tread and provided with at least one incision which opens on to the surface wall of the element in relief and on to at least one undercut lateral wall. So as not to alter the rigidity of said element in relief, in a manner which may be disadvantageous for the performance of a tire fitted with this tread, provision is made that, for levels of wear of the tread between a first depth H1 and a second depth H2, each incision does not cut into the edges or ridges of said element in relief. Also, a mold equipped with molding elements for molding such a tread pattern.

Abstract: A tread for a tire bearing heavy loads, the tread being made of a rubber mix and having at least one incision defined by opposing walls, each wall having elements in relief intended to cooperate with the elements in relief of the facing wall in the contact of the tread with the roadway. The width of the incision is at a maximum in that region of the tread which undergoes the maximum deformations due to the Poisson effect resulting from the loading of the tread in the contact with the roadway, in order to obtain more effective cooperation of the walls defining said incision in the contact.

Abstract: A molding element for a mold for molding a tread, intended to mold in this tread an incision of circular shape around an axis XX′, the main opposing walls of which are connected by a plurality of connecting bridges of rubber mix. This molding element includes two molding parts, each formed by a support extended by at least one molding blade. At least one of the molding parts has a support extended by a blade which is at least partially helical around the axis XX′ and mounted freely in rotation around XX′ relative to the other molding part. The blades of the molding parts cooperate to define a plurality of orifices intended for molding the connecting bridges.

Abstract: A molding element for equipping a mold for molding a rubber tread, composed of at least two molding parts provided with lateral walls and end walls joining the lateral walls, the lateral walls being intended to mold in the rubber tread main walls defining a cutout, the main walls being connected by at least one rubber connecting element. In the molding position, the molding parts of the molding element are arranged such that one wall of a molding part is in contact with at least one wall of another molding part, the geometries of the walls of the molding parts being functionally arranged to form at least one orifice permitting the passage of the rubber for molding a connecting element.

Abstract: A tread is provided with at least one rubber stud of orientation XX′ perpendicular or inclined with respect to the tread surface. The rubber stud has a side wall bounded by at least one incision and an outer end wall. The stud is joined to the tread at its base (the rubber stud part located farthest inward on the tread) and by at least one rubber connecting element joining the side wall of said stud to the rest of the tread. The projected length, on the tread surface in new condition and in the direction XX′, of the principal geometrical lines of the surfaces of intersection of all the connecting elements of each rubber stud, represents at least 80 percent of the contour perimeter, measured on the same surface, of each rubber stud. Preferably, the principal geometrical lines bounding the surfaces of intersection of the connecting elements are in the form of helixes around XX′, and the projected length of said lines is equal or close to 100 percent of the perimeter.

Abstract: A molding element designed to mold a cut in a rubber article, such as a tire, and in which the cut has a geometry of rotation on an axis XX′. The molding element has a head extended by a molding part intended to project into the molded surface in order to mold at least one cut in the rubber article. The head is mounted for rotation in a mold member, and the head contains at least one circular cylinder of axis XX′ defining the main axis of the molding element, and cooperates with mold member in order to permit a rotation on XX′ relative to the mold, when the molding part of the molding element is subjected either to a force acting in direction XX′ or to a torque about the same direction XX′.

Abstract: A process of molding of a rubber tread making it possible, after molding grooves, to strip the mold without rupture of connecting elements molded in the grooves. A molding element for molding a groove pattern in a rubber tread, the groove defined by at least two main opposite walls joined by at least one molded rubber connecting element, the molding element being designed to project from a molding surface of the mold and presenting at least one opening for molding a connecting element during molding of the tread. The molding element is constituted by the assembly of a first part forming a support, intended to be fastened to a piece of a mold by appropriate means, and of a second part constituted by at least one piece forming a key. Each key is disengaged from the support in order to strip the molding element from the mold.