Mcneil & Nrm, Inc.

Nrm Steelastic, Inc.

Michael J Allen

Donald S Bibona

Jean C Girard

Apparatus (10) for applying hot cushion gum (E) in a strip (12) of predetermined thickness and width to the crown surface (14) of a tire carcass (16) having a sagittal plane (68). The apparatus (10) includes a motor (M) for rotating the tire carcass (16), and extrusion means (18) for dispensing hot cushion gum through a die means (26). The angular disposition of the die means (26) may be selected relative to the sagittal plane (68) of the tire carcass (16) to determine the effective width of the strip (12) applied to the crown surface (14), rotational control mechanism (64) is also provided selectively to control the angular velocity of the rotating tire carcass (16) which determines the thickness of the strip (12). According to the present method a tire carcass (16) is mounted for rotation. The die head (26) is positionable at a selected angle (.beta.) within its angular range (.alpha.) measured transversely of the sagittal plane ( 68) of the tire carcass (16) to establish a selected, effective width (W.sub.SEL) of the strip (12) as it is applied by the die head (26) to the crown surface (14). So disposed the die head is brought into slightly deforming engagement with the crown surface (14), and the tire carcass (16) is rotated at a predetermined angular velocity while hot cushion gum is extruded through the die head (26) onto the crown surface (14) of the tire carcass (16).

Method for applying hot cushion gum to a tire carcass

Apparatus (10) for applying hot cushion gum (E) in a strip (12) of predetermined thickness and width to the crown surface (14) of a tire carcass (16) having a sagittal plane (68). The apparatus (10) includes a motor (M) for rotating the tire carcass (16), and extrusion means (18) for dispensing hot cushion gum through a die means (26). The angular disposition of the die means (26) may be selected relative to the sagittal plane (68) of the tire carcass (16) to determine the effective width of the strip (12) applied to the crown surface (14). rotational control mechanism (64) is also provided selectively to control the angular velocity of the rotating tire carcass (16) which determines the thickness of the strip (12). According to the present method a tire carcass (16) is mounted for rotation. The die head (26) is positionable at a selected angle (.beta.) within its angular range (.alpha.) measured transversely of the sagittal plane ( 68) of the tire carcass (16) to establish a selected, effective width (W.sub.SEL) of the strip (12) as it is applied by the die head (26) to the crown surface (14). So disposed the die head is brought into slightly deforming engagement with the crown surface (14), and the tire carcass (16) is rotated at a predetermined angular velocity while hot cushion gum is extruded through the die head (26) onto the crown surface (14) of the tire carcass (16).

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El Toro, CA, United States of America

Michael J Allen