Cam follower assembly for thin walled cylinder of scroll shaping drum used in tire construction

In a scroll shaping drum useful in the construction of tires and including an internal air cylinder, an inner, thin-walled sleeve member having inner and outer cylindrical surfaces wherein the outer cylindrical surface provides an interior wall of the air cylinder, and a roller member positioned about the inner sleeve member and defining an inner cylindrical surface providing an exterior wall of the air cylinder and wherein there is provided between the inner sleeve member and the roller member positioned thereabout a plurality of cam follower assemblies which are each anchored within 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 internally-threaded opening;
• and
• the hub of each cam follower assembly includes a mounting portion positionable within the internally-threaded 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 externally threaded and adapted to be threadably accepted by the internally-threaded 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 and thus reinforced by a greater amount of material than would be the case if the mounting portion were only surrounded and thus reinforced by the material of the wall of the inner sleeve member.

In a scroll shaping drum useful in the construction of tires and including an internal air cylinder, an inner, thin-walled sleeve member having inner and outer cylindrical surfaces wherein the outer cylindrical surface provides an interior wall of the air cylinder, and a roller member positioned about the inner sleeve member and defining an inner cylindrical surface providing an exterior wall of the air cylinder and wherein there is provided between the inner sleeve member and the roller member positioned thereabout a plurality of cam follower assemblies which are each anchored within 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 internally-threaded opening;
• and
• the hub of each cam follower assembly includes a mounting portion positionable within the internally-threaded 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 externally threaded and adapted to be threadably accepted by the internally-threaded 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 and surrounds and thus reinforces the mounting portion of the hub.