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 (10) includes an elongated deformable body member (16) having a blade (18) extending in a direction away therefrom and substantially along the length thereof. The body member also includes a stiffening member (32) 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.
Mold with a device for molding a keyhole sipe in a tire tread
Form mit einer Vorrichtung zum Formen eines schlüssellochförmigen Einschnitts in einer Reifenlauffläche
Moule pourvu d'un outil pour mouler une incision en forme de trou de serrure dans une bande de roulement de pneumatique
2016-04-20
Patent
Electronic Resource
English