A damping adjustment device for adjusting a damping force to a window covering system while the window covering system is expanding, wherein the damping adjustment device comprises a damping module comprising first and second damping units. The damping force is outputted by the damping module to the window covering system when the first and second damping units generate an interaction force in between by a relative motion therebetween. An adjusting module is connected to the damping module for operating with the damping module simultaneously, wherein the damping force from the damping module is adjusted by the adjusting module altering a relative position of the first damping unit and the second damping unit when the relative motion occurs therebetween. A window covering system comprises the damping adjustment device, wherein expansion speed of a covering material of the window covering system can be effectively controlled and adjusted by the damping adjustment device.

In a window covering system and a window covering control apparatus thereof, the window covering control apparatus comprises a driving module, a damping output module, and a damping control module. The damping output module and the driving module are configured to operate simultaneously. The driving module may drive the damping output module to provide damping to the driving module. The damping control module comprises a control detecting unit and a fitting unit. The control detecting unit comprises a detecting portion and a stopper portion, which are detachably engaged. During an expansion of a covering material, the driving module drives the damping output module to provide damping to the driving module; when the stopper portion is driven apart by the detecting portion from the fitting unit, the driving module operates independently of the damping output module to stop the damping output module from providing damping.

In a window covering system and a window covering control apparatus thereof, the window covering control apparatus comprises a driving module, a damping output module, and a damping control module. The damping output module and the driving module are configured to operate simultaneously. The driving module may drive the damping output module to provide damping to the driving module. The damping control module comprises a control detecting unit and a fitting unit. The control detecting unit comprises a detecting portion and a stopper portion, which are detachably engaged. During an expansion of a covering material, the driving module drives the damping output module to provide damping to the driving module; when the stopper portion is driven apart by the detecting portion from the fitting unit, the driving module operates independently of the damping output module to stop the damping output module from providing damping.

A simply-mounted rope-running curtain is provided comprising an upper mounting portion, a curtain body, at least one pull rope, a lower pull rod, at least one rope clamp, and at least one rope fixing device; an upper end of the curtain body is connected to the upper mounting portion and a lower end of the curtain body is connected to the lower pull rod; the pull rope runs through the upper mounting portion, the curtain body and the lower pull rod; the lower end of the curtain body and the lower pull rod slide up and down along the pull rope; the rope clamp is disposed on the lower pull rod to tightly clamp the pull rope and limit the lower pull rod; the rope fixing device is fixedly disposed below the lower pull rod to fix the free end of the pull rope exposed below the lower pull rod.

A simply-mounted rope-running curtain is provided comprising an upper mounting portion, a curtain body, at least one pull rope, a lower pull rod, at least one rope clamp, and at least one rope fixing device; an upper end of the curtain body is connected to the upper mounting portion and a lower end of the curtain body is connected to the lower pull rod; the pull rope runs through the upper mounting portion, the curtain body and the lower pull rod; the lower end of the curtain body and the lower pull rod slide up and down along the pull rope; the rope clamp is disposed on the lower pull rod to tightly clamp the pull rope and limit the lower pull rod; the rope fixing device is fixedly disposed below the lower pull rod to fix the free end of the pull rope exposed below the lower pull rod.

A hold down device is provided for continuous loop cords or bead chains in a window covering installation. The hold down device engages the cord or chain while the cord or chain is loosely suspended, and prevents operation by encountering the head rail if the cord or chain is operated. Mounting the hold down device in a window covering installation disengages the hold down device from its secured position relative to the cord or chain.

A hold down device is provided for continuous loop cords or bead chains in a window covering installation. The hold down device engages the cord or chain while the cord or chain is loosely suspended, and prevents operation by encountering the head rail if the cord or chain is operated. Mounting the hold down device in a window covering installation disengages the hold down device from its secured position relative to the cord or chain.

A handle is releasably secured to a rail wall by means of fasteners extending from inside the rail. An actuator shaft pushes against a contact plate to move a movable braking member to stop the rotation of a rod inside the rail.

A handle is releasably secured to a rail wall by means of fasteners extending from inside the rail. An actuator shaft pushes against a contact plate to move a movable braking member to stop the rotation of a rod inside the rail.

The invention relates to a tensioning device for tensioning an endless loop control element in a window blind and particularly relates to a blind operating mechanism and an endless loop blind control element for operating the blind mechanism and having: a channel extending from an upper end to a lower end, with the endless loop blind control element enclosed within the channel; a connector supporting the upper end of the channel adjacent to the blind operating mechanism; and, the tensioning device on the lower end of the channel. The invention also discloses a narrow profile control element having a sprocket wheel with the channel, connector and tensioning device.