Patent ID: 6949213
Filing Date: 2005-09-27
Classification: B29D

Abstract:
1. A vulcanizing mold for pneumatic tires, comprising: upper and lower base plates; upper and lower sidewall mold members for forming tire sidewall portions, said upper and lower sidewall mold members being attached to said upper and lower base plates, respectively; upper and lower tread mold members for forming a tire tread portion, said upper and lower tread mold members being attached to said upper and lower base plates, respectively; said upper and lower tread mold members being constituted of upper segments and lower segments, respectively, said upper and lower segments being displaceable only radially relative to said upper and lower sidewall mold members, respectively; a spring that urges the lower segments radially outwards; and a single cam ring in direct engagement with the upper and lower tread mold members, the single cam ring being displaceable independently of approaching displacements of said sidewall mold members toward each other, to thereby simultaneously displace all of said upper and lower segments radially inwards while the single cam ring remains in direct engagement with the upper and lower tread mold members and while said upper and lower segments are in abutment with each other.