Cord tilter with an elevated start gear ratio

摘要

A venetian blind cord tilter, mounted in a head rail, that interfaces and drives a tilt rod, with the tilter itself having a wheel gear (20) to which lines are wound for rotating the tilt rod and subsequently slats held within ladders for opening and closing the blind. The wheel gear has a split wheel (22) which separates the lines that open and close the slats and an integral worm gear (26) is mounted on a shaft (24) to drive a separate helical gear (44) in which the tilt rod is inserted. The gears have an elevated start gear ratio to achieve a fast action when rotating the slats in the blind. A housing (50) retains the shaft and helical gear rotatably in place and provides for mounting the tilter within, a head rail (28). A cradle (58) is snapped into place beneath the housing and has a beveled projection (64) which is inserted into a square or rectangular hole in the bottom of the head rail (28) for mounting. An incremental positioning bushing (47) is disposed over the teeth (25) in the shaft to prevent backlash and permit positive angular displacement of blind slats used in conjunction with the tilter. The cradle (58) is interchangeable permitting the appropriate color to be used for coordinating the cradle (58) mating with the head rail (28).