Patent ID: 7921897

Claim:
A ladder drum, which pivotally mounts to a control rod within a Venetian blind tilt mechanism, for selectively regulating the angular adjustment and closure of slats in a horizontal blind assembly of the type incorporating ladder cords and tape ladders, said ladder drum comprising: an elongated polygonal cylindrical structure having a plurality of exterior plane sidewalls defining a substantially hollow interior, said exterior sidewalls having at least two opposing planar sidewalls that are equal in dimension but greater in measurement than the remaining mediate sidewalls that define the profile structure; a tilt rod aperture longitudinally extending through the central section of the polygonal cylindrical structure, said aperture formed to correspondingly receive a polygonal control rod of the Venetian blind tilt mechanism; a hollow profile segmented by at least five primary reinforcing ribs which diverge from the central tilt rod aperture defining a sequence of longitudinally extending hollow cavities, with at least two cavities having an open end and a closed end, with said ribs demarcating no less than two upper cavities, two mediate cavities, and one bottom cavity within the profile structure; two sinusoidal grooves, each longitudinally defined in parallel relation upon at least one of the two opposing larger planar sidewalls defining the profile structure, with each groove bisecting the top sidewall of each corresponding upper cavity; two elongated rods, each extending from a closed end of each corresponding upper cavity, and each rod situated below a corresponding sinusoidal groove; a pair of access slots reciprocally located on nonadjacent mediate sidewalls of the profile body to accommodate the insertion and retention of corresponding tabbed ladder legs of a ladder cord; a singular tapered notch, transforming into a wider retaining slot, longitudinally defined within the bottom cavity of the profile structure, said slot bisecting the second of the two opposing larger sidewalls of the polygonal tilt drum; and the singular tapered notch, which transforms into the wider retaining slot, has a midsection that is greater in width than the origin or terminus of the slot.