US 12,280,558 B2
Vulcanization mold and pneumatic tire manufactured with the mold
Tatsuhiko Hatano, Tokyo (JP); Yasuo Shibata, Tokyo (JP); and Tatsuya Nakai, Tokyo (JP)
Assigned to BRIDGESTONE CORPORATION, Tokyo (JP)
Appl. No. 17/311,128
Filed by BRIDGESTONE CORPORATION, Tokyo (JP)
PCT Filed Nov. 15, 2019, PCT No. PCT/JP2019/044939
§ 371(c)(1), (2) Date Jun. 4, 2021,
PCT Pub. No. WO2020/129502, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-237713 (JP), filed on Dec. 19, 2018.
Prior Publication US 2021/0379850 A1, Dec. 9, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B29D 30/06 (2006.01); B29C 33/34 (2006.01)
CPC B29D 30/0606 (2013.01) [B29C 33/34 (2013.01); B29D 2030/0613 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A vulcanization mold in which an annular mold for forming a tire tread of a pneumatic tire is split in a circumferential direction into a plurality of sector molds and the sector molds are moved in directions toward a center and combined with each other to clamp a raw tire on an inner side to vulcanization mold the raw tire,
each of the sector molds having blades implanted on a mold surface thereof, the blades being plates extending in a tire widthwise direction and being used to form groove lines on the tire tread,
each of the blades having a blade proximal end portion to be embedded into the sector mold, a blade distal end side thick portion expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the blade proximal end portion and the blade distal end side thick portion to each other, wherein
a sweep area that is a difference where a cross sectional area of the blade connection portion is subtracted from an area from the blade distal end side thick portion to the mold surface with a width equal to a maximum width of a thickness of the blade distal end side thick portion in a cross sectional shape perpendicular to the tire widthwise direction of the blades is smaller at the blades in circumferential end portion side regions than at the blades in a circumferential central portion side region of the sector molds.