SEALED JOINT Russian patent published in 1994 - IPC

FIELD: rescue rubber suits. SUBSTANCE: sealed joint for flexible envelopes comprises external and internal zipper fasteners with flexible knife and embracing flexible membrane therebetween. Joint has flexible thrust insert and two curving flexible bands. Thrust insert is located on the opposite side of membrane and is secured to flexible envelope and to inner and outer zipper fasteners. Flexible bands are secured at two sides of flexible knife throughout its length along rib and to thrust insert. Flexible knife has end portions 50-100 mm long which make it 10% wider than its middle portion. Lock handle of inner zipper has the form of pin curved across flexible knife. EFFECT: improved design. 3 cl, 6 dwg