| 摘要 |
PROBLEM TO BE SOLVED: To eliminate danger to an infant which is inherent in an endless type pull cord. SOLUTION: A control unit for controlling a lift mechanism in a covering for an architectural opening includes a drive assembly and a brake assembly 42. The drive assembly includes a spool about which the pull cord 32 can be wrapped or unwrapped and a spring for energizing the spool in a direction to wrap the pull cord thereabout. A drive gear 60 is operatively associated with the spool so that, upon pulling the pull cord and unwrapping the pull cord from the spool, the drive gear is shifted axially into engagement with a driven gear 64 in the brake assembly. The driven gear under such circumstances rotates a driven shaft, which in turn rotates a lift shaft in the covering to raise the covering from an extended position to a retracted position. COPYRIGHT: (C)2009,JPO&INPIT
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