Abstract: A gasket of elastic material, such as rubber or similar for use in forming a seal between respective sealing surfaces of two members to be joined, the sealing surfaces of the members being moved substantially parallel to each other during installation for squeezing the gasket therebetween. The gasket comprises in combination a major portion or core which due to the squeezing between the sealing surfaces effects a packing pressure, and a relatively thin gasket portion embracing the core so as to define a closed jacket around the core, said jacket being provided with a lubricant on the inside, and so as to transfer the movement taking place between the sealing surfaces via the jacket by the sliding thereof along the core. The jacket may be provided with intermediate portions, such as folds, undulations or corrugations which are stretched during installation for thereby increasing the sliding length of the jacket.

Abstract: A gasket of rubber or a similar material for sealing joints between the sealing surfaces of two members to be joined, for example pipe sections comprising a spigot and a socket part. The gasket is placed in a fixed position on the sealing surface of one of the members, and for assembly of the members the sealing surfaces of both members are displaced substantially parallel to each other for squeezing the gasket therebetween due to displacement of portions of the gasket relative to other gasket portions. The gasket portions which during the installation of the members are displaced relative to each other define one or more closed very narrow slits extending in the longitudinal direction of the gasket. The width of the slits is so small that the said gasket portions while being displaced during the installation are constantly in contact and slide along each other.