Device for molding a keyhole sipe in a tire tread

Details Device for molding a keyhole sipe in a tire tread Device for molding a keyhole sipe in a tire tread

2005-07-21

2010-02-16

Maki, Steven D (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

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

C152S209210, C152SDIG020, C249S183000, C249S184000, C264S313000, C264S318000, C264S326000, C425S046000, C425S438000, C425SDIG058

Reexamination Certificate

active

07661942

ABSTRACT:
The present invention provides for an improved device for molding keyhole sipes larger in size, i.e. sipes having a wider passage, than currently being formed in treads that will avoid damaging the tread during formation and removal thereof from a mold. The device includes an elongated deformable body member having a blade extending in a direction away therefrom and substantially along the length thereof. The body member also includes a stiffening member securely fixed in position therein that extends substantially the length thereof. The stiffening member provides a desired rigidity to the deformable body member, thereby limiting flexion along its length under the stress of a rubber formulation when the mold is closed during the molding process. Also, the deformable body member provides low stress on the tread when a slit of the keyhole sipe is pulled around the body member during removal of the tread from a mold.

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