An operating device for a screen comprises: a first operating mechanism with a first operating element which is connected to a first movement transfer element connected by means of a first transmission to a drive element for a screen shaft. The first operating mechanism is configured to convert a linear movement of the first operating element to a rotational movement of the drive element for operating the screen shaft in a first rotational direction. The operating device further comprises a second operating mechanism comprising a second operating element which is connected to a second movement transfer element connected by means of a second transmission to the drive element. The second operating mechanism is configured to convert a linear movement of the second operating element to a rotational movement of the drive element for operating the screen shaft in a second rotational direction opposite to the first rotational direction.

An operating device for a screen comprises: a first operating mechanism with a first operating element which is connected to a first movement transfer element connected by means of a first transmission to a drive element for a screen shaft. The first operating mechanism is configured to convert a linear movement of the first operating element to a rotational movement of the drive element for operating the screen shaft in a first rotational direction. The operating device further comprises a second operating mechanism comprising a second operating element which is connected to a second movement transfer element connected by means of a second transmission to the drive element. The second operating mechanism is configured to convert a linear movement of the second operating element to a rotational movement of the drive element for operating the screen shaft in a second rotational direction opposite to the first rotational direction.

A wand for a chain or cord to operate a window treatment, comprising: an enclosure extending from a first end to a second end for covering said chain or cord from said first end to said second end to permit passage of said chain or cord during operation of the window treatment from an open position to a closed position, and inhibit access to said chain or cord between said first end to said second end.

A wand for a chain or cord to operate a window treatment, comprising: an enclosure extending from a first end to a second end for covering said chain or cord from said first end to said second end to permit passage of said chain or cord during operation of the window treatment from an open position to a closed position, and inhibit access to said chain or cord between said first end to said second end.

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.

An enclosure for an endless loop blind control element for operating a blind operating mechanism, wherein the enclosure extends from a first end to a second end and said endless loop blind control element is enclosed within said enclosure from said first end to said second end and connected to said blind operating mechanism.

An enclosure for an endless loop blind control element for operating a blind operating mechanism, wherein the enclosure extends from a first end to a second end and said endless loop blind control element is enclosed within said enclosure from said first end to said second end and connected to said blind operating mechanism.

A blind pull cord connector has a cord passage section and a connection section. The cord passage section has more than one cord passage bodies, each of which is formed with a through hole. An inner face of each cord passage body is formed with a cut face. The connection section is passed through a punched hole of rear side of a blind slat, whereby the cord passage section is positioned on outer side of the slat. When the slat is horizontally opened or vertically closed, the connector structure is limited by the slat so that the connector is connected with the blind slat and naturally kept horizontal. In this case, a pull cord can be easily and quickly passed through the through holes of the cord passage bodies, whereby the frictional resistance against the pulling of the pull cord is reduced and the slats can be more tightly closed. In addition, by means of the restriction of the cord passage bodies of the cord passage section, a ladder cord and the pull cord are located. When the slats are displaced, under the pullback of the cord passage bodies, the positions of the slats can be automatically micro-adjusted to restore to a flush state.

A blind pull cord connector has a cord passage section and a connection section. The cord passage section has more than one cord passage bodies, each of which is formed with a through hole. An inner face of each cord passage body is formed with a cut face. The connection section is passed through a punched hole of rear side of a blind slat, whereby the cord passage section is positioned on outer side of the slat. When the slat is horizontally opened or vertically closed, the connector structure is limited by the slat so that the connector is connected with the blind slat and naturally kept horizontal. In this case, a pull cord can be easily and quickly passed through the through holes of the cord passage bodies, whereby the frictional resistance against the pulling of the pull cord is reduced and the slats can be more tightly closed. In addition, by means of the restriction of the cord passage bodies of the cord passage section, a ladder cord and the pull cord are located. When the slats are displaced, under the pullback of the cord passage bodies, the positions of the slats can be automatically micro-adjusted to restore to a flush state.