An actuating system for a window shade includes a first rotary axle rotatable for displacing a bottom part, a second rotary axle rotatable for displacing an intermediate rail, and a limiting mechanism including a first and a second sliding part respectively linked movably to the first and second rotary axle. The first sliding part slides in a first direction when the first rotary axle rotates for lowering the bottom part and in a second direction when the first rotary axle rotates for raising the bottom part. The second sliding part slides in the first direction when the second rotary axle rotates for lowering the intermediate rail and in the second direction when the second rotary axle rotates for raising the intermediate rail. The first sliding part is prevented from sliding in the second direction via a contact between the first sliding part and the second sliding part.

A covering for an architectural opening has a dual cord operating system. The covering may include a head rail, blind panels depending from the head rail, and an operating system. The operating system may include a housing connected to the head rail, a first drive assembly rotatably mounted within the housing and operable to move the blind panels between an extended configuration and a retracted configuration, and a second drive assembly rotatably mounted within the housing and operable to move the blind panels between a closed configuration and an open configuration.

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 blind cord guide seat includes a connection seat fixed under a blind rail and a cord restriction seat connected under the connection seat. The cord restriction seat includes a fixing section and a latch section. An outer face of each of the fixing section and the latch section is formed with a belt guide channel. The top end of the fixing section is formed with threaded holes for connecting with the connection seat by screws. When assembled with a cord winding device, an external force is applied to the latch section to outward bias the latch section to provide an opening for placing the cord winding device through the opening into the cord restriction seat. An iron-made hook bracket and a latch body are securely disposed at the upper end of the latch section for securely latching the latch section with the connection seat.

A control device for coupling with a shaft of a window blind and controlling rotation of the shaft includes first and second ratchet seats, a spool assembly operable to rotate in unwinding and winding directions, a tubular case, an output unit coupled with the shaft, and a transmission unit operable to be shifted between a transmitting state to have a torque transmitted to the output unit, and a non-transmitting state to interrupt the torque transmission. Each ratchet seat has a surrounding groove and teeth. Balls are rollably engaged in the surrounding groove and the spool assembly for permitting rotation of the first ratchet seat with the spool assembly in the unwinding direction, and not to rotate the first ratchet seat in the winding direction.

A winding assembly and a retractable curtain, which may adjust the tensile force of a cord. The winding assembly of the retractable curtain comprises a fixing seat and a winding shaft rotatably disposed on the fixing seat, wherein a threading hole and guiding holes are opened in the fixing seat for the cord to pass through successively; there is a plurality of guiding holes opened in different positions of the fixing seat, and the threading hole is located between the outer wall of the winding shaft and the plurality of guiding holes. The outer wall of the winding shaft tilts outward gradually along the axis thereof, and the threading hole is opened on a part of the fixing seat corresponding to one end of the winding shaft with a larger outer diameter.

Disclosed herein is a cordless window covering that has one or more removable securement mechanisms that are positionable at various locations along one or more straps that are coupled to a first side of the window covering. Different portions of each of the one or more straps are coupled to the window covering at a number of different positions. This enables the one or more removable securement mechanisms to be removably coupled to each of the different positions.

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 modular shade includes at least one module that consists of a head rail unit, a foot rail unit, at least one intermediate rail unit, and a plurality of slat components. A top slat may be coupled to the head rail unit and the intermediate rail unit, and a bottom slat component may be coupled to the intermediate rail unit and the foot rail unit. Further, additional intermediate rail units and intermediate slat components may be added to the module to alter the shape and size of the module, and the module may be coupled to one or more additional modules to change the overall shape and size of the modular shade.

A double-layer Roman shade folding structure includes a bracket. The bracket is provided with an outer curtain fabric, a roller tube, and an inner curtain fabric. The outer curtain fabric is provided with a plurality of strip-shaped limiting members that are arranged horizontally and spaced apart at equal intervals. An opening is defined between the limiting members and the outer curtain fabric for the inner curtain fabric to pass therethrough. When the bottom end of the inner curtain fabric drives the bottom end of the outer curtain fabric to be moved up, the plurality of limiting members are pushed and moved up in sequence so that the outer curtain fabric is folded and overlapped continuously.