A telescopic assembly (1) has a first resilient tube (2) and a second resilient tube (3) that have end-to-end openings between opening edges (4, 5, 7, 8) at circumferential overlaps (6, 9) or alternatively at gaps (24, 25). The resilient tubes can be cylindrical (22, 23), rectangular (26, 27) triangular...http://www.google.com.au/patents/US5661263?utm_source=gb-gplus-sharePatent US5661263 - Surface raceway and method
