| 摘要 |
A linear actuator for a platform having a frame with an open end and a platform moveable within the frame, said platform driven by a motor powered axle mounted traversely to the platform. The platform is driven by a drive system powered by the motor driven axle and generally having a pair of fixed pitch independent devices, such as chains, each chain mounted at each of its ends to the frame and aligned with the platform's axis of travel, a double drive sprocket adjacent an end of the axle, a pair of double idler pulleys aligned substantially with a chain, a pair of single idler pulleys aligned substantially with the other chain. Each chain is routed through the double drive sprocket and one chain routes through the double idler pulley, while the other chain routes trough the both the double idler pulleys and the pair of single idler pulleys.
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