METHOD OF MANUFACTURE OF LIFTING PAD OF FLEXIBLE JACK Russian patent published in 1997 - IPC

FIELD: materials lifting facilities; pneumatic mechanisms; flexible jacks. SUBSTANCE: method comes to manufacture of hermetically sealed chamber, longitudinal and cross load-bearing envelopes, protective envelope and assembling the members into pock and pressing the pack with simultaneous curing. Load-bearing envelopes are manufactured by winding layers of reinforcement material onto oval-shaped mandrel. Smaller axis of oval is calculated by formula b = (0,4-0,6)b₁ where b₁ is smaller axis of profile of inflated flexible pad in operating state. EFFECT: uniform distribution of working loads on pad structure, increased reliability, reduced requirements to quality of materials and cost of manufacture.