| 摘要 |
A powered track assembly ( 20 ) is provided for allowing selective forward and rearward adjustment of a seat assembly ( 10 ) along an interior floor of an automotive vehicle. The upper track ( 24 ) is fixedly secured to a bottom portion of the seat assembly ( 10 ). A rigid shaft ( 32 ) having a generally continuous helical thread ( 38 ) is rotatably supported by the upper track ( 24 ). A plurality of nuts ( 40 ) is threadingly engaged with the shaft ( 32 ). A cage ( 42 ) having a plurality of compartments ( 58 ) is fixedly secured to the lower track ( 22 ). Each compartment ( 58 ) supports one nut ( 40 ) to allow relative rotational movement of the rigid shaft ( 32 ) relative to the nuts ( 40 ). The nuts ( 40 ) are allowed a predetermined amount of movement within the respective compartments ( 58 ) to prevent binding between the nuts ( 40 ) and the rigid shaft ( 32 ) due to relative lateral or vertical movement between the upper and lower tracks.
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