| 摘要 |
An actuator is disclosed employing back-to-back roller band clusters coupled to a trolley in a housing chamber with the trolley having an arm extending through a slot in the housing. The band closes the slot and also closes the chamber at the locations of the clusters on either side of the arm so that the introduction of expansible gas at one end of the chamber drives the trolley to the opposite chamber end. Preferably, the band is formed of steel ribbon and is held in place by magnets. The chamber is formed of a number of housing segments so that the chamber length can be widely varied. As a modification, a backup roller can be mounted on the trolley to help resist the gas pressures.
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