Abstract: A tread-pattern for tires, particularly for large-size tires destined for high-speed vehicles that have a great load-capacity. The tread-pattern is characterized by the presence of a plurality of circumferential zig-zag grooves that divide the tread-band into longitudinal ribs and by means of a plurality of sipes that divide the central ribs into a circumferential succession of blocks which the sipe-profiles render mutually indented one into the other. The profile is a broken line constituted by three successive segments of which the initial and final ones constitute the extension of a portion of the zig-zag development of the longitudinal grooves, while the central one presents a greater circumferential development than the corresponding development between the end-points of the sipe.

Abstract: The tread-pattern presents a plurality of circumferential zig-zag grooves that divide the tread-band into a plurality of ribs, and a series of sipes which divide at least the axially inner ribs, into a plurality of blocks that are reciprocally locked, one with respect to the other, in the transversal direction.The above-said grooves, are comprised by an alternated succession of narrow notches and large elliptical shaped cavities, with the greater axis constituting one side of the zig-zag, with having the cross-section, the slant of the sidewalls and the base-profile, variable with continuity.

Abstract: A molding and/or vulcanizing press that is provided with two adjacent sites for containing two corresponding vulcanizing molds, each mold comprising at least two opposite sections, lower and upper sections respectively, that are reciprocally shiftable axially, defining a cavity inside which a product is molded and/or vulcanized, each section being mounted on corresponding tables. A device is provided for coupling the molds integral with a beam and a base and interposed respectively between the beam and an upper table and between the base and a lower table. The device is provided with coupling surfaces with corresponding matching surfaces provided on the tables for allowing each mold relative shifting between the closed and pressurized mold and a frame.

Abstract: A device for rapidly disassembling an extractor unit from the driving mechanism of a press for vulcanizing pneumatic tires is positioned on the lower part of the open vulcanizing mould, while the extractor unit comprises a body of a substantially annular shape apt to be fixed to a mobile shaft of the vulcanizing press through first connecting means comprising a first set of radial teeth obtained on said shaft and a second set of radial teeth obtained on said body and able to cooperate with said teeth of the first set to block the body with respect to the shaft in consequence of a rotation of the former with respect to the latter; the device comprises also dragging means including a disc which rotates in consequence of the action of a lever, hand operated, said disc is provided with a plurality of stakes whose axis is parallel to the axis of said body, said dragging means being able to cooperate with said extractor unit so that said stakes are inserted into holes of said body to make this latter rotate with re

Abstract: There is described a tire vulcanizing press, comprising a frame provided with a lower supporting plate for allowing a mold for vulcanizing the tires to rest upon, and an upper plate that is mobile with respect to the lower plate. The mold comprises a lower cheek, an upper cheek that is mobile with respect to the lower cheek, and a series of sectors, that are mobile with respect to an annular-containing element, each of which is radially mobile with respect to the upper cheek. The mold further comprises a connecting means for fixing the lower cheek to the lower plate, and the upper cheek and the annular element to the upper mobile cheek, and which comprises a series of rotating bodies on the lower and upper plates which are actionable from the outer side of the plates with respect to the mold.