Patent ID: 7000672

Claim:
A Venetian blind comprising a non-pull cord operated raising and lowering structure, including a plurality of slats, a lower beam at the lower end of the slats having a pivot hole disposed at the bottom side of each of two ends thereon, and a control unit and a sealing cap attached to each respective end of the lower beam thereof wherein the control unit is provided with a housing cavity indented at one side thereof to which the sealing cap is joined at one side in sealing engagement therewith; at one inner side of the housing cavity thereof is disposed a serrated guiding face correspondingly matched to a retaining gear element which is movable to a position abutted against a retaining shaft at one side which clamps tight a respective left or right retaining cord of the blind there-between, and a through hole is disposed at the top and bottom sides of the housing cavity respectively in communication with the pivot hole of the lower beam for the left or right retaining cord to be passed there-through which is fixed to a windowsill at the bottom end thereof.