Patent ID: 6971434

Claim:
A non-pull cord operated Venetian blind for a window comprising: a) a blind; b) a lower beam connected to a bottom of the blind; c) left and right pull cords, each of the left and right pull cords is led through one of two opposing sides of the blind and one of two opposing ends of the lower beam, each of the left and right pull cords having an end connected to a windowsill of the window; and d) a pair of clamping devices, each clamping device having: i) a coupling body ( 31 ) located on an interior of the lower beam and having a central through hole ( 312 ) with a stop flange ( 311 ); ii) a movable unit ( 314 ) movable between engaged and disengaged positions and having a serrated retaining section ( 3141 ), a spring ( 313 ) located on a first end thereof, and a push rod ( 3142 ) located on a second end thereof, the first end of the movable unit is inserted into the central through hole, the spring is located between the serrated retaining section and the stop flange, each push rod having a cord hole ( 3143 ), one of the left and right pull cords is inserted through each cord hole; and iii) a fixed unit ( 32 ) located on one of the two opposing ends of the lower beam of the lower beam and having a serrated fixing section ( 321 ) and a central passage ( 322 ) located in a center of the serrated fixing section, the push rod is inserted through and protrudes outwardly from the central passage, wherein the spring is biasing the serrated retaining section towards the serrated fixing section, in the engaged position each of the left and right pull cords is fixed between one serrated retaining section and one serrated fixing section, and in the disengaged position each of the left and right pull cords is slidably located between one serrated retaining section and one serrated fixing section.