Locking device for raisable venetian blind
AssigneeHunter Douglas International N.V.
InventorPetrus J. Hennequin
Life of this patent
Estimating the term…
Abstract
This invention relates to a locking device for a raisable or liftable venetian blind in which the bottom rail of the venetian blind includes an end piece extending into and guided by the side housing of the blind and in which a flexible lifting member engages the end piece of the bottom rail to raise and lower the same. A spring urged pivoted latch is provided within the lower portion of the housing which automatically engages over the end piece of the bottom rail when it is in the lowered position and the tension in the lifting member is relaxed. Thus the blind is locked in the down position. When tension is applied to the lifting member to lift the blind, the lifting member moves the latch out of locking engagement with the end piece permitting the blind to be raised.
Claims7
In a locking device for a raisable venetian blind having a side housing, a bottom rail, and a flexible lifting member engaging the bottom rail for raising and lowering the same, the improvement comprising an end piece on the bottom rail extending into said housing for vertical movement with said bottom rail along a path of travel, a latch pivoted in said housing, said latch being movable between a first position in which at least a portion thereof is positioned in said vertical path of travel of said end piece and a second position in which said end piece may pass thereby, said latch being positioned to be engageable with said flexible member, and the position and movement of said latch being at least in part determined by the tension or lack thereof in said flexible member when engaged with said latch.
In a locking device for a raisable venetian blind having a side housing, a bottom rail, and a flexible lifting member engaging the bottom rail for raising and lowering the same, the improvement comprising an end piece on the bottom rail extending into said housing for vertical movement with said bottom rail along a path of travel, a latch pivoted in said housing, said latch being movable between a first position in which at least a portion thereof is positioned in said vertical path of travel of said end piece and a second position in which said end piece may pass thereby, and said latch being movable between said first and second positions upon operation of said flexible lifting member to raise or lower the blind.
Dependencies are inferred from the claim text.