Importance

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Abstract

A zero-adjuster for lateral blind leaves includes a transmitting gear engaging a worm having an end engage portion inserted in a shaft hole of an actuating wheel. When the ropes on the actuating wheel are pulled downward, the actuating wheel with the worm activated to rotate the transmitting gear and the square shaft biasly to let the ropes on the square shaft adjust the leaves angles. Plural position plates arranged in a hexagon shape, with a gap formed to let each position plate have proper elasticity and a spring provided between a pair of the position plates to maintain a definite elasticity, define the hollow portion of the worm. When the leaves angles are adjusted to the maximum and the transmitting gear and the worm cannot rotate and if the ropes are continually pulled, the position plates deform inward and the actuating wheel rotates idle, preventing the worm from damaged.

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First Claim