Patent ID: 6685136
Filing Date: 2004-02-03
Classification: B64B

Abstract:
A pressure-resistant balloon comprising:an airtight pressure-resistant gasbag including a plurality of spindle-shaped gores of an airtight film material, adjacent gores joined together at side edges, and a set of load tapes fitted to joined sections of the side edges, the load tapes extending along the side edges, respectively; and a volume changing mechanism which deforms the gasbag in a fully inflated state to change a volume of the gasbag; the gasbag, after inflated, allowing no gas to be discharged so as to maintain an internal gas pressure; each of the gores outwardly protruding between two adjacent load tapes extending along the side edges of the gore, respectively, without an elongation of the airtight film material of the gore, when the gasbag is in the fully inflated state; the protruding gores having a radius of curvature in a plane intersecting with the two adjacent load tapes, the radius of curvature being smaller than a radius of the gasbag; the protruding gores being subject to a tensile force which is directed in the direction intersecting with the two adjacent load tapes.