| 摘要 |
A linear actuator (210) includes a housing (220) surrounding a rotatable element (270) fixed about a rotatable shaft (232). First and second moving members (290, 292) are reciprocally mounted within the housing (220). The moving members (290, 292) are movable between a first position engaging and spacing the rotatable element (270) from bearing surfaces (256, 258) at opposite ends of the housing (220) to prevent rotation of the rotatable element (270) and the shaft (232), and a second position spaced from the rotatable element (270) to enable the rotatable element (270) to move axially into engagement with one of the bearings (290, 292) to permit free rotation of the rotatable element (270) and the shaft (232). Pairs of angularly extending ramp surfaces (294, 296) on each moving member (290, 292) slide within angled guide slots (266, 268) in the housing (220) to guide the moving members (290, 292). |
