A pull cord equalizer buckle for window blind is disclosed to include two equalizer buckle members abutted against each other. Each equalizer buckle member includes a cord-escape hole and a cord-retaining slot at a bottom side relative to the cord-escape hole. Two pull cords are respectively inserted through the cord-escape holes of the two equalizer buckle members and retained by one respective cord-retaining slot. If the two pull cords are forced outwards by an external object, the pull cords will give an outward pressure to the close ends of the respective cord-escape holes, and these two equalizer buckle members will be forced apart and released from the pull cords if the pressure imparted by the pull cords is larger than the binding force between the two equalizer buckle members, ensuring application safety.

A manual drive assembly for a manually-operated window treatment based on a drive chain formed as a loop, may incorporate one or more intermediate tensioners disposed between two ends of the loop. The loop may be formed between a manual clutch mechanism coupled to the window treatment and an end tensioner. The one or more intermediate tensioners may serveto limit slack in the loop such that sides of the loop cannot be pulled to create a large loop, for example, having a gap of four inches or greater, between the hanging sides of the cord.

A Venetian blind includes a plurality of slats arranged between a headrail and a bottom rail. Two rotary drums are disposed in two brackets mounted in the headrail and connected with each other through a transmission shaft. A first drawing member is connected with one rotary drum, and a second drawing member is connected with the other rotary drum. When the first drawing member is pulled downward, the rotary drums are rotated from a first position to a second position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to a closed position. When the second drawing member is pulled downward, the rotary drums are rotated from the second position to the first position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to an open position.

A Venetian blind includes a plurality of slats arranged between a headrail and a bottom rail. Two rotary drums are disposed in two brackets mounted in the headrail and connected with each other through a transmission shaft. A first drawing member is connected with one rotary drum, and a second drawing member is connected with the other rotary drum. When the first drawing member is pulled downward, the rotary drums are rotated from a first position to a second position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to a closed position. When the second drawing member is pulled downward, the rotary drums are rotated from the second position to the first position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to an open position.

In one aspect, a slat configured for use with a covering for an architectural structure includes a route slot defined at least partially by a route wall that is recessed relative to one or more outer faces of the slat. Additionally, the recessed route wall further defines a through-hole for passing a cord through the route slot between the opposed outer faces of the slat. By configuring the disclosed route slot in this manner, the dimensions of the through-hole can be significantly reduced while still allowing full tilting of the slat to the closed position, thereby increasing light control and privacy for the associated covering.

In one aspect, a slat configured for use with a covering for an architectural structure includes a route slot defined at least partially by a route wall that is recessed relative to one or more outer faces of the slat. Additionally, the recessed route wall further defines a through-hole for passing a cord through the route slot between the opposed outer faces of the slat. By configuring the disclosed route slot in this manner, the dimensions of the through-hole can be significantly reduced while still allowing full tilting of the slat to the closed position, thereby increasing light control and privacy for the associated covering.

A folding blind mounted on a window frame includes a main body including a first and second wiring holes and a third and fourth wiring holes respectively formed on a top portion and a bottom portion thereof, and a wiring recess formed inside thereof for connecting with the first to fourth wiring holes; and an adjusting member including a first adjusting wire and a second adjusting wire with their corresponding ends respectively fixing with an upper portion of the window frame, and their opposite corresponding ends respectively passing through the first wiring hole, the wiring recess and the fourth wiring hole, and passing through the second wiring hole, the wiring recess and the third wiring hole in turn, and then fixing with a lower portion of the window frame. The main body is moved on the adjusting member to adjust a shielding position of the main body.

A folding blind mounted on a window frame includes a main body including a first and second wiring holes and a third and fourth wiring holes respectively formed on a top portion and a bottom portion thereof, and a wiring recess formed inside thereof for connecting with the first to fourth wiring holes; and an adjusting member including a first adjusting wire and a second adjusting wire with their corresponding ends respectively fixing with an upper portion of the window frame, and their opposite corresponding ends respectively passing through the first wiring hole, the wiring recess and the fourth wiring hole, and passing through the second wiring hole, the wiring recess and the third wiring hole in turn, and then fixing with a lower portion of the window frame. The main body is moved on the adjusting member to adjust a shielding position of the main body.

A motor driven system for raising and lowering a window covering executes motor ramp trajectory speed control. The motor ramp trajectory limits acceleration of an external motor from the idle (stationary) state to full operating speed, and limits deceleration of the motor from full operating speed back to the idle state. This function reduces stresses on a continuous cord loop drive mechanism. A control system manages solar heating effects in response to sunlight entrance conditions such as system sensor outputs, external weather forecasts, and other data sources. The system automatically opens or close the window covering to increase or decrease admitted sunlight under appropriate conditions. The input interface of the control system includes a visual display and input axis, which are aligned vertically if the window covering mechanism raises and lowers the window covering, and are aligned horizontally if the window covering mechanism laterally opens and closes the window covering.

A motor driven system for raising and lowering a window covering executes motor ramp trajectory speed control. The motor ramp trajectory limits acceleration of an external motor from the idle (stationary) state to full operating speed, and limits deceleration of the motor from full operating speed back to the idle state. This function reduces stresses on a continuous cord loop drive mechanism. A control system manages solar heating effects in response to sunlight entrance conditions such as system sensor outputs, external weather forecasts, and other data sources. The system automatically opens or close the window covering to increase or decrease admitted sunlight under appropriate conditions. The input interface of the control system includes a visual display and input axis, which are aligned vertically if the window covering mechanism raises and lowers the window covering, and are aligned horizontally if the window covering mechanism laterally opens and closes the window covering.