Vacuum cleaner suction pipes include sealing ring grooved to accept resilient O-ring seal, which is compressed in non-circular, annular interspace

摘要

The external surface (5a) of the sealing ring (5), has a circumferential circular groove (5b) surrounding it. Into this an O-ring with entropy-elastic characteristic is inserted, as a seal. It contacts the inner circumferential surface (2a) of the outer pipe (2), precompressing it and completing the seal of the non-circular interspace (4).