| 摘要 |
1437497 Expandable mandrel or roller L R DAMOUR 20 Dec 1973 [26 Dec 1972] 59092/73 Heading F2U An expandable mandrel or roller comprises a body 20 provided with ends 33 and an intermediate portion, an inflatable tube 30 disposed in a helical groove in the intermediate portion, longitudinally disposed gripping members 32 movable outwardly by the inflatable tube to the limit set by retaining members 34, and a fluid pressure connection 54 for filling and discharging the inflatable tube. The inflatable tube 30 may be made of rubber, one end being closed by a clamp associated with one of the holding down bolts 36 of the retaining members, the other end being inserted over a conical plug of the connection 54 which may be fitted with a tyre-type valve. The outer surfaces of the gripping members may be ribbed to provide a good grip on a surrounding cylinder to be driven. In a modification for a rewind roller, Figs. 12 to 14 (not shown), the gripping members (132) are made of polished aluminium or plastics to provide a smooth sliding action. When the gripping members are made of aluminium their outer surface may be coated with plastics or chemically treated. |
