Patent ID: 8056597
Filing Date: 2011-11-15
Classification: B29D

Abstract:
1. In a scroll shaping drum useful in the construction of tires and including an inner, thin-walled sleeve member having a wall defining inner and outer cylindrical surfaces and a roller member positioned about the inner sleeve member and defining an inner cylindrical surface and further including an air cylinder wherein an interior wall of the air cylinder is provided by the outer cylindrical surface and an exterior wall of the air cylinder is provided by the inner cylindrical surface of the roller member and wherein there is provided a plurality of cam follower assemblies wherein each cam follower assembly is anchored within the wall of the inner sleeve member by way of a hub and has a cam follower member positioned about the hub and which is accepted by an appropriately-shaped slot defined in the roller member so that upon actuation or de-actuation of the air cylinder, the roller member is forced along the length of the inner sleeve member as the movement of the roller member is guided by the cooperation between the cam follower members and the slots defined within the roller member, the improvement characterized in that: the inner sleeve member defines an opening in the wall thereof; and the hub of each cam follower assembly includes a mounting portion which is positionable within the opening of the inner sleeve member and a support portion about which a cam follower member is supported; and the improvement further includes an insert member which is adapted to be accepted by the opening of the inner sleeve member and which has a central through-opening within which the mounting portion of the hub is positioned and which has a length which exceeds the thickness of the wall of the inner sleeve member so that the mounting portion of the hub is surrounded by and thereby reinforced by a greater amount of material than would be the case if the mounting portion were only surrounded by and supported by the material of the wall of the inner sleeve member; and wherein the opening defined in the wall of the inner sleeve member is internally-threaded, and the insert member is externally-threaded and adapted to be threadably accepted by the internally-threaded opening of the inner sleeve member.