Hunter Douglas International N.v.

Marinus Frederik Koks

Petrus Gerardus Van Der Mars

A cord lock for fitment to the end of a head rail of a blind, the cord lock including a base element, a cap structure on the base element and together with the base element and together with the base element defining therebetween a cord inlet, a cord outlet and a cord passage extending therebetween, a cord guide surface formed in the base element and extending inwardly of the cord lock from the cord outlet, a locking roller and roller guide walls formed in the cap structure defining a path along which the locking roller may move, the path being adjacent to and inclined with the cord guide surface such that the roller moves closer to the cord guide surface whilst moving away from the cord outlet, wherein with the cord lock oriented in use such that the roller moves under gravity away from the cord guide surface, movement of a cord inwardly from the cord outlet along the cord guide surface will cause the roller to move towards the cord guide surface and pinch the cord therebetween.

Cord lock

A clutch mechanism (9a, 9b) for a vertical venetian blind is disclosed in which a first clutch part (9a) is mounted for sliding relationship on, but non-rotatable with respect to, a rotatable drive shaft (8). A second clutch part (9b) has a cylinderical portion (9e) surrounding the hub (9f) of the first clutch part (9a). The second clutch part (9b) is mounted for rotation about and slidably movable along the axis of drive shaft (8). Toothed gear faces (10a, 10b) on clutch parts (9a, 9b) are engageable upon rotation of the drive shaft (8) to rotate a hook (14) carrying a slat (1b) to rotate the slat. The walls (2a, 2b) of the housing (2) are resilient to permit axial engagement and disengagement of the gear faces (10a, 10b). When the slat (1b) has reached the limit of its travel, a worm (11) on part (9b) engages a stop (15or 16), preventing further rotation of part (9e). Continued torque applied to part (9a) forces parts (9a and 9b) apart against the resilient pressure applied thereto by the walls (2a, 2b) of housing (2). After the excess torque is released, the walls (2a, 2b) resiliently re-engage gear faces (10a, 10b) by moving parts (9a, 9b) toward each other.

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Rotterdam, Netherlands

Marinus Frederik Koks