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.

The invention refers to a pull cord arrangement for a roller blind or a venetian blind, comprising a winding element (4) arranged to be connected to a blind (6) such that the blind (6) is released or wound in response to a rotational movement of the winding element (4) about a rotational axis; a connecting element (28) coupled to the winding element (4) to rotate together with the winding element (4); and a pull cord (50) engaging the connecting element (28) so as to control the rotation of the connecting element (28) and thus the winding element (4) as the pull cord (50) is operated.

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 motorized window shade system may comprise a shade tube in a pocket; a window shade attached to the shade tube; a motor configured to rotate the shade tube; an internal temperature sensor configured to measure a first temperature of the motor; an external temperature sensor configured to measure a second temperature of the pocket; and a controller configured to adjust a mode of the system from an override mode to an automated mode.

A motorized window shade system may comprise a shade tube in a pocket; a window shade attached to the shade tube; a motor configured to rotate the shade tube; an internal temperature sensor configured to measure a first temperature of the motor; an external temperature sensor configured to measure a second temperature of the pocket; and a controller configured to adjust a mode of the system from an override mode to an automated mode.

A motorized window shade system may comprise a shade tube in a pocket; a window shade attached to the shade tube; a motor configured to rotate the shade tube; an internal temperature sensor configured to measure a first temperature of the motor; an external temperature sensor configured to measure a second temperature of the pocket; and a controller configured to adjust a mode of the system from an override mode to an automated mode.

A connector for coupling to a bead chain is disclosed. In use, the connector is arranged and configured so that the connector can pass over a bearing. In one example of an embodiment, the bearing is positioned in a tensioner so that the connector moves through the tensioner, which is operatively coupled to the bead chain. In one example embodiment, application of a force on the bead chain to move the covering between an extended position and a retracted position, self-orients the connector so that a top portion of the connector faces and/or contacts the bearing so that the connector smoothly passes across an exterior arcuate surface of the bearing. In one example embodiment, the top portion includes a curved surface to contact the curved surface of the bearing.

A curtain controller structure includes a fixing seat, an assembling seat having an accommodation space formed between the fixing seat and the assembling seat. The assembling seat includes a first chamber. A bead chain disc is disposed in the accommodation space. A first driving assembly is disposed in the first chamber of the assembling seat and has a first driving unit and a second driving unit. A traction string is connected to the first driving unit or the second driving unit of the first driving assembly and the bead chain disc.

A bead chain safety system for roller blinds is revealed. The system includes a fixing base, an assembly base, a rotary disc, a first transmission member, and an elastic member. When a child entangled pulls a bead chain, the first transmission member is retracted into a cavity of the rotary disc and both the rotary disc and the bead chain are released from a rotary-disc mounting space between the fixing base and the assembly base. In order to put the rotary disc and other parts back, first the elastic member and the first transmission member are mounted into the cavity in turn. Then the rotary disc and the bead chain are set into the rotary-disc mounting space. The first transmission member pushed back by the elastic member is locked with and positioned by a second transmission member. Thus the bead chain and other parts are mounted again easily.

The invention relates to an operating device (1) for a screen, comprising: a first operating mechanism with a first operating element (7) which is connected to a first movement transfer element connected by means of a first transmission to a drive element (60) 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 (R). The operating device (1) further comprises a second operating mechanism comprising a second operating element (8) which is connected to a second movement transfer element connected by means of a second transmission to the drive element (60). 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 (L) opposite to the first rotational direction.