A sleeve is provided with a clamp for removably clamping the sleeve on a mandrel. A rigid ring is mounted inside of the sleeve at each end of the sleeve. Each ring has a generally cylindrical inside surface which includes a curved contact portion which extends for less than 180 degrees and which is engageable...http://www.google.fr/patents/US6647879?utm_source=gb-gplus-shareBrevet US6647879 - Bridge sleeve for printing apparatus
