Assembly drum and method for the manufacture of tires

Details Assembly drum and method for the manufacture of tires Assembly drum and method for the manufacture of tires

1999-04-26

2001-06-26

Knable, Geoffrey L. (Department: 1733)

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Tire body building type

C152SDIG006, C156S132000, C156S135000, C156S414000, C156S417000

Reexamination Certificate

active

06250356

ABSTRACT:

BACKGROUND OF INVENTION
The present invention concerns a method of manufacture of tires and a radially expansible assembly drum making it possible to use the method.
The invention concerns, in particular, the manufacture of a tire including a carcass reinforcement and at least one reinforcing bead wire in each of the beads of the tire, inside which the carcass reinforcement forms a turn-up and the two beads of which have different diameters.
The building of this type of tire requires the use of an assembly drum that itself presents sites for receiving beads of different diameters. However, this requirement for accommodating different diameters presents production problems and difficulties in controlling the quality and reliability of the tires produced.
It is important, for the quality and reliability of the tire, to place the components of the carcass reinforcement, such as plies, etc., on the drum evenly in terms of geometry, and therefore centering and imparting tension in the products. This seems particularly difficult on a drum in which the diameters of the bead receiving sites are different. However, it is possible to overcome these difficulties by placing the different products slowly and carefully by hand. It is clear that this solution is not adaptable to the industrial context.
Furthermore, construction of the turn-up of the carcass reinforcement in the beads of the tire necessitates stretching of the carcass reinforcement at the points around which the carcass reinforcement rotates, which is difficult to accomplish simultaneously at two sites of different diameters.
The invention is directed to overcoming these problems.
SUMMARY OF THE INVENTION
According to the invention, the assembly drum, having a body mounted on a center shaft and presenting a receiving surface for the products to be assembled, the ends of which have different diameters, contains retractable means capable of covering the end of the receiving surface of smaller diameter, and means of expansion of the drum to two separate expanded positions.
The retractable means make it possible to create, when that is desired, a generally cylindrical overall surface for receiving the products and the expansion means ensure, due to the two expansion positions of the drum, the possibility of stretching the products on each of the sites of different diameters.
The invention also concerns a method of manufacture of a tire, which includes the following steps:
using a first surface having ends of different diameters;
moving toward said first surface a second surface of roughly identical diameter at the end of greater diameter of the first surface in order to cover the end of smaller diameter of the first surface and create a generally cylindrical overall receiving surface;
depositing a carcass reinforcement on said overall surface;
depositing a metal or rubber ring-shaped element respectively on each of the ends of the carcass reinforcement;
retracting the second surface and expanding the first surface;
turning up each end of the carcass reinforcement respectively around the corresponding ring-shaped element.
Expansion of the first surface is advantageously greater than or equal to the difference in diameter existing between the two ends of said first surface.


REFERENCES:
patent: 2045545 (1936-06-01), Shook
patent: 2440662 (1948-04-01), Frazier
patent: 5301728 (1994-04-01), Brown, Jr. et al.
patent: 6030479 (2000-02-01), Ringhoff et al.
patent: 1198054 (1965-08-01), None
patent: 0481805 (1992-04-01), None
Patent Abstracts of Japan, vol. 98, No. 12, JP 10180901 A (Yokohama Rubber) Jul. 7, 1998.

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