Tire mold having a plurality of blocks defining a matrix with ve

Details Tire mold having a plurality of blocks defining a matrix with ve Tire mold having a plurality of blocks defining a matrix with ve

1991-04-11

1993-08-10

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Reshaping, resizing or vulcanizing means for tire, tire...

Toroidal or annular female shaping means and coacting means...

425 47, 425812, B29C 3922

Patent

active

052343260

ABSTRACT:
In a metallic mold, all or a part of the annular portion for molding at least the tread of the tire is formed by a plurality of small separate pieces that can be combined to form said annular portion. Between these small pieces, during the molding of the tire, clearances are maintained so as to permit the passage of air but not the passage of rubber. The above clearances are connected through vent holes to air suction means. Such vent holes are also connected with means for blowing pressure fluid through the clearances. The construction of this mold portion by means of small pieces made with cuts of the aforementioned portion in the axial and the circumferential direction permits regulation of the width of the clearances with respect to the rheometric characteristics of the elastomeric material to be molded and to adapt easily the mold to different tire sizes by increasing or decreasing the number of such pieces.

REFERENCES:
patent: 2442718 (1948-06-01), Woock
patent: 2444898 (1948-07-01), Butterfield
patent: 2599433 (1952-06-01), Cohen
patent: 2924851 (1960-02-01), Birckhead et al.
patent: 3842150 (1974-10-01), Carter
patent: 3854853 (1974-12-01), Mirtain
patent: 4086047 (1978-04-01), Johnsen
patent: 4379687 (1983-04-01), Wilson et al.
patent: 4655699 (1987-04-01), Collier
patent: 4691431 (1987-09-01), Hayata
patent: 4708609 (1987-11-01), Yoda et al.
patent: 4812281 (1989-03-01), Beard et al.
patent: 4895502 (1990-01-01), Beard et al.
patent: 4909972 (1990-03-01), Britz
patent: 5066209 (1991-11-01), Schraderer et al.
Hayata is cited as of interest for disclosing aluminum as a mold material and various radial and circumferential vent grooves or clearances (see FIGS. 4 and 8).
Carter is cited as of interest for disclosing plural circumferential vents (grooves) a vacuum system and interconnecting passages between the circumferential vent grooves.

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