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US 5,950,700 AGranted
Pneumatic tire and vulcanization mold therefor
AssigneeBridgestone Corporation
InventorToru Fukuoka
Life of this patent
Estimating the term…
Abstract
A pneumatic tire comprises sipes in each land portion defined by wide-width grooves in a tread portion, in which a sipe corresponding to at least a part of these sipes comprises a pair of main portions slightly shifting to each other in the axial direction and a link portion connecting opposed end portions of these main portions to each other, and the pair of the main portions are inclined in opposite directions with respect to a radial direction so as to make a mutual distance L between the main portions large.
Claims10
A pneumatic tire comprising:
- a tread portion divided by a plurality of wide-width grooves into a plurality of land portions and provided on each of land portions with a plurality of sipes, a sipe between two of said wide-width grooves corresponding to at least a part of these sipes comprises a pair of main portions extending substantially in an axial direction and being shifted in the circumferential direction relative to each other and a link portion connecting opposed end portions of said main portions to each other and extending substantially in a circumferential direction, and said pair of the main portions being inclined in opposite directions with respect to a radial direction to increase a mutual distance L between the main portions as the depth of the main portion increases along the entire depth of the sipe.
A vulcanization mold for the production of a pneumatic tire comprising;
- frame segments for forming wide-width grooves in a tread portion of the tire, a recess defined by said frame segments for forming a land portion in the tread portion, and a plurality of blades disposed in the recess and for forming sipes in the land portion, in which a blade between two of said frame segments corresponding to at least a part of these blades comprises a pair of main segments extending substantially in an axial direction and being shifted in the circumferential direction relative to each other and a link segment connecting opposed end portions of these main segments to each other and extending substantially in a circumferential direction, and the pair of the main segments are inclined in opposite directions with respect to a radial direction so as to increase a mutual distance M between the main segments as the main segments protrude upward from the bottom of the recess along the entire height of the blade.
Dependencies are inferred from the claim text.