Expandable tire building drum with improved bladder

Details Expandable tire building drum with improved bladder Expandable tire building drum with improved bladder

B - Operations, Transporting

29

D

154/18.7

B29D 30/26 (2006.01)

Patent

CA 1125641

Abstract: An expandable tire building drum has an improved bladder for expanding and contracting the drum segments. Instead of being a closed torus with a radially inwardly extending inflation stem, the bladder is completely open on its radially inward side and has beads that are clamped in an airtight seal to the bladder support. The bladder in its deflated condition rests in three folded layers within its storage cavity in the drum. This bladder con- struction allows a bladder having a relatively large surface area to be stored in a relatively small cavity. The space in the cavity for storing such bladders is often limited, particularly in drums for building radial passen- ger car tires. Putting a larger bladder in this cavity than allowed by prior constructions results in a greater surface contact between the bladder and the drum segments when the bladder is inflated. This enables the drum to be expanded using lower bladder pressures, which means the bladder walls do not have to be as strong and they will not wear out as fast. Also, small air leaks is the bladder inflation system will not be as critical.

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