An apparatus for adjusting a tilt angle of a plurality of slats in a window blind. The window blind includes a headrail having disposed therein a shaft that rotates responsive to rotation of an externally accessible angle adjustment wand. The apparatus includes a pulley coupled with the shaft and the slats. The pulley causes adjustment of the tilt angle of the slats in response to rotation of the shaft, provides a first torque at a first position corresponding to an open position of the slats and a second torque at a second position corresponding to an approximately closed position of the slats, where the second torque is greater than the first torque.

A window covering includes a positional adjustment mechanism connected to a first rail that includes a spring motor unit, a first lift cord pulley connected to the spring motor unit, a first lift cord collection mechanism having a first roller positioned in the first rail, and a first lift cord that extends from the first lift cord pulley through window covering material such that a portion of the first lift cord passes along the first roller. The first roller is configured so that it only rotates a pre-selected number of revolutions when the window covering material is moved from the extended position to the retracted such that the first roller no longer rotates in the second rotational direction as the window covering material is moved from an extended position to a retracted position after having rotated the pre-selected number of revolutions in the second rotational direction.

A blind control for a window covering having a narrow profile; and particularly relates to a control module for a window shade where the location of the drive mechanism is selected to minimize the gap between the end of the window shade and inside edge of a window opening; locating the drive mechanism in a shell disposed in a housing to rigidity a reduced thickness of the drive so as to minimize the gap; and use a single rod depending from the control module to activate the drive mechanism in a safe and secure manner.

The invention also includes a housing with an end wall adjacent one end of the shade; a clutch projecting from said end wall and rotatable about a clutch axis, a drive gear engageable at one end of the clutch for rotatably driving said clutch and shade, said drive gear disposed in said housing adjacent said end wall; and a wand for driving said drive gear.

A cordless roller shade includes a head unit (1), a shading face (2) mounted on the head unit, an elastic dynamic device (13) mounted on the head unit, and a bottom unit (3) mounted on the shading face. The elastic dynamic device includes a spring (133) having a thickness ranged between 0.1 mm and 0.2 mm. The bottom unit includes at least one balance member (33) having a determined weight ranged between 0.1 kg and 1.2 kg, and the shading face and the bottom unit have a total weight ranged between 1 kg and 5 kg, to balance the torque of the spring of the elastic dynamic device, so that the shading face is moved by the bottom unit to a determined position and is located at the determined position.

Disclosed is a drive device for a vertical window blind, comprising: a driving connecting rod, a driving screw rod and an open-and-close transmission rod connected with a slat open-and-close control screw of the vertical window blind, wherein the driving connecting rod drives the slat open-and-close control screw to axially rotate in the horizontal direction by the rotational driving force via the driving screw rod and the open-and-close transmission rod, thereby moving a plurality of slats slidably disposed on the slat open-and-close control screw in the horizontal direction.

A method of operating a motorized window covering is presented wherein in response to a standard movement command power is supplied to a motor in a continuous or generally continuous manner thereby moving the shade material from a start position to an end position in a generally continuous manner. However, in doing so, the motor rotates at a fast rate thereby causing elevated noise levels. In response to an automated movement command, power is supplied to the motor by cycling power to the motor between a powered state and an unpowered state thereby moving the shade material from a start position to an end position in an incremental manner. While moving the shade material in this incremental manner is slower, it is substantially quieter. The preferred mode of operation is selected based on whether the movement command is a standard movement command or an automated movement command.

A window covering includes a tilt mechanism positionable in a first rail. The tilt mechanism includes a tilt shaft gear, a control gear, and a wand connector. An upper end of the wand connector has a hole in communication with a channel defined in a body of the wand connector such that a central projection of the control gear is insertable into the wand connector via the hole and the channel. A plurality of protrusions extend from the body of the wand connector around a periphery of the body of the wand connector. Each of the protrusions can have an upper surface configured to contact a respective one multiple prongs that extend from the control gear to engage the prongs to facilitate a direct connection of the wand connector to the control gear.

A slat angle adjustment mechanism adapted for use with slats of a Venetian blind includes a body shell and a transmission unit. The transmission unit includes a transmission gear set and a retractable member. The transmission gear set has a gear and a screw. A position-limiting hole of the gear corresponds in position to a second through hole of the body shell. The retractable member connects to the extendible segment of the screw and undergoes reciprocating motion along the extendible segment of the screw. Pulling the retractable member from an initial first position of the extendible segment of the screw to a second position of the extendible segment of the screw allows a rib of the body shell to be confined to a limiting portion of the retractable member. Therefore, the slat angle adjustment mechanism is capable of extension, retraction, engagement and fixation.

A slat angle adjustment mechanism for Venetian blind includes a body shell and a transmission unit including a transmission gear set and retractable member. The transmission gear set includes a gear having a position-limiting hole corresponding a second through hole of the body shell, and a screw rod with an extension shank. The retractable member is connected to and movable back and forth along the extension shank of the screw rod. When pulling the retractable member, the retractable member is moved along the extension shank of the screw rod from a first position; when pushing the retractable member, the retractable member is moved along the extension shank of the screw rod from the second position back to the first position. Thus, subject to the retractable characteristic, the slat angle adjustment mechanism prevents damage during packaging.

A tilt mechanism for a blind includes a spool, two transmission shafts, two transmission sleeves and a driven shaft. The spool has an inner gear. Each transmission shaft has an assembling portion and a gear. The gears are engaged with the inner gear. The transmission sleeves are respectively engaged with the assembling portions of the transmission shafts, and each transmission sleeve has an outer surface and a worm gear located at the outer surface thereof. The driven shaft has a teeth portion, and the teeth portion is engaged with the worm gear. The transmission shafts and the transmission sleeves are simultaneously rotatable by being driven by the spool, and the driven shaft is rotatable between a start position and a stop position along an operating direction by being driven by the transmission sleeves.