Abstract: A cord-resistance adjusting device for a venetian blind includes limiting blocks disposed in a casing unit containing a scroll spring and cord reels. Each of two side casing parts of the casing unit has inner and outer limiting columns mounted thereinside. Each limiting block is movably disposed in the respective side casing part between the inner and outer limiting columns. A lift cord bends around and frictionally contacts the respective limiting block when moving from the inner limiting column to the outer limiting column.

Abstract: A window blind includes top and bottom beams, and many slats disposed therebetween. The top beam has two opposite lateral holes. The window blind further includes a slat folding transmission device having a cord rolling member disposed in the top beam, and two opposite lift transmission cords passing through the lateral holes of the lateral plates of the top beam respectively. Two ends of each lift transmission cord are connected with the bottom beam and the cord rolling member respectively, so that the two lift transmission cords can pull the bottom beam simultaneously when being rolled by the cord rolling member, thereby moving the bottom beam upwardly to fold up the slats. Therefore, the slats of the window blind of the invention need no processing and keep complete in structure, thereby providing good effect of blocking out the light when being adjusted to the inclined condition.

Abstract: A lift-cord guide for window blind is disclosed to include a roller holder including a pull cord inlet and a pull cord outlet extending in a perpendicular manner relative to the pull cord inlet, and a first guide roller rotatably mounted in the roller holder at the intersection between the extending direction of the pull cord inlet and the extending direction of the pull cord outlet. The axial direction of the first guide roller obliquely intersects with the extending direction of the pull cord inlet, and defines with the extending direction of the pull cord outlet a contained angle smaller than 90-degrees. Thus, the lift-cord guide of the invention effectively reduces the turning angle of the pull cords, and smoothens the operation to open or close the blind slats.

Abstract: A shade lock assembly for a shade assembly is provided. The shade lock assembly may include a spool rotatably attached to a housing, with the housing defining a pull cord channel. A pull cord may be provided that extends through the pull cord channel and wraps at least partially around the spool. The pull cord channel may include a roller wheel configured to interact with the pull cord and a second wall of the pull cord channel such that it may move between a locked and an unlocked position based at least in part by the angle at which the pull cord is held relative to a plane defined the shade assembly.

Abstract: A cord lock assembly for a shade assembly is provided. The cord lock assembly may include a spool rotatably attached to a housing, with the housing defining a pull cord channel. A pull cord may be provided that extends through the pull cord channel and wraps at least partially around the spool. The pull cord channel may include a roller configured to interact with the pull cord and a rear wall of the pull cord channel such that it may move between a locked and an unlocked position based at least in part by the angle at which the pull cord is held relative to a plane defined the shade assembly.

Abstract: A controlling mechanism for a cordless blind set includes a fastening seat, a controlling member, and two driving gears. A coil spring is between the two driving gears each engaged with a driven gear. Each of the driven gears is coupled with a transmission rope passing through the fastening seat and the controlling member and then gets fixed in an upper beam. To operate the blind set, a pushing force is applied to the controlling member to release the transmission ropes. The driving gears are then driven by the coil spring and rotate the driven gears simultaneously, so the driven gears can roll up/release the transmission ropes.

Abstract: A cord drive mechanism to convert linear motion to circular motion for use in coverings for architectural openings. Various controls are used to provide a braking force on the cord. Some of the embodiments incorporate a capstan.

Abstract: A cord locker of a roman shade includes a base, a rotary member and a connector. The connector is fixed to a shade member of the roman shade, and the base is connected to the connector. The rotary member is pivoted on the base to let the cord passes through between the rotary member and the base. While the cord is pulled, it will turn the rotary member and make the rotary member press the cord onto the base. As a result, the cord is unable to be pulled anymore in a very short time.

Abstract: A structure to secure a curtain rope includes a base and an engaging body. The bases engages with the engaging body to secure the curtain rope, and a securing unit is provided to secure the structure to a wall surface, so that the curtain rope is restricted to the wall by the securing unit, which increases the convenience for the user to control the curtain rope, and prevents small children from being tripped over and strangulation accidents.

Abstract: A venetian blind operating device comprises a wand having a center hole and a slide slot. The slide slot runs through the wand in an axial direction and intersects the center hole. In addition, the operating device comprises a blind cord locking assembly locked in the center hole of the wand and coupled to a blind cord of a venetian blind. Further, the operating device comprises a control key surroundingly provided at a periphery of the wand, and a press key provided on the control key for disengaging the blind cord locking assembly from a locked state. The blind cord is hidden by being contained in the center hole of the wand. The press key, the control key and the blind cord locking assembly are cooperated to withdraw or draw the venetian blind.

Abstract: A window blind includes a headrail, a bottom rail, a plurality of slats, and a cord. The slats are arranged between the headrail and the bottom rail, and each slat has two bores and one or plural of locking slots. Each locking slot has an open end and a closed end, and the opening end of the locking slot is connected to the bore. The cord passes through the headrail and the bores of the slats, and being fastened to the bottom rail. A diameter of the cord is greater than or equal to a width of the locking slot. As a result, the cord goes into the locking slot quickly and can be clamped by edges of the locking slot while a kid is trying to pull the cord out of the slats.

Abstract: A curtain bead chain fixing device includes a bead chain guide way through which a bead chain as a pull cord for controlling a curtain is extended and thereby becomes connected to the fixing device, and an elastically movable interfering element being normally pushed into the bead chain guide way to interfere with the free movement of the bead chain in and along the bead chain guide way. When the fixing device is adequately mounted to a wall surface according to specified installation procedures, the interfering element is forced out of the bead chain guide way to release the bead chain therefrom. Therefore, a user of the curtain is urged and guided to adequately mount the fixing device to hold the bead chain in place, and undesired accidents caused by a swinging bead chain can be avoided.

Abstract: A cord release for a window covering includes at least two cases engaged together to form a barrel with an opening at a top thereof. The cord release is defined with a frontal plane and a sagittal plane. A left side and a right side are defined at opposite sides of the sagittal plane, and a front side and a back side are defined at opposite sides of the frontal plane. The opening has a first collecting portion at the front side of the frontal plane and the right side of the sagittal plane, and a second collecting portion at the back side of the frontal plane and the left side of the sagittal plane. Therefore, the cords will be led to the first collecting portion and the second collecting portion to disengage the cases by the struggle force.

Abstract: A cord release of the present invention includes two cases engaged together to form a shell with a top opening at a top thereof. At least one of the cases is provided with a guiding member at a top thereof, and the guiding member is located at a junction of the cases. The guiding member has a guiding face with a convex surface facing the center of the top opening. Therefore, the guiding member may lead the cords to opposite sides of the top opening, which are located away from the junction of the case, to disengage the cases easily.

Abstract: The present invention provides a cord controller to be mounted on a top rail of a window covering. The cord controller includes a base, a cord controlling device, and a cord regulating device. The base has a chamber therein and an inlet and an outlet on opposite sides of the chamber, and the cord controlling device and the cord regulating device are received in the chamber. The cord controlling device has a gap between the inlet and the outlet for the cord to pass through. The cord regulating device is adjacent to the outlet and has cord pressing bar to form a passageway between the cord pressing bar and the base for the cord to pass through. Therefore, the cord controller may avoid the cords twisting and keep a smooth movement of the cords.

Abstract: A safety retainer for curtain cords is revealed. The safety retainer is used to hold a cord used to open and close curtains in place. The safety retainer includes an inner base and an outer base that are disposed with fixing holes. The inner base and the outer base are fixed on a wall while the cord for control of curtains is passed through the fixing holes. Thereby the cord is held in place by the safety retainer to prevent children from pulling out and being strangled by the cord.

Abstract: A bail lock for coverings for architectural openings wherein at least one of the bails defines a cord guide surface of changing front-to-back cross-sectional profile so as to define a cord passage between the inner and outer bails that varies from a relatively straight path that allows the cord to pass freely through, to a more tortuous path that applies substantial frictional force to the cord.

Abstract: A venetian blind operating device comprises a wand having a center hole and a slide slot. The slide slot runs through the wand in an axial direction and intersects the center hole. In addition, the operating device comprises a blind cord locking assembly locked in the center hole of the wand and coupled to a blind cord of a venetian blind. Further, the operating device comprises a control key surroundingly provided at a periphery of the wand, and a press key provided on the control key for disengaging the blind cord locking assembly from a locked state. The blind cord is hidden by being contained in the center hole of the wand. The press key, the control key and the blind cord locking assembly are cooperated to withdraw or draw the venetian blind.

Abstract: A cord lock guide for a blind operated by a blind cord, wherein the cord hangs in a loop from a blind head rail, and having a main body portion, formed of front and back panels, and junction portions extending between the front and the back panels, a cord passage defined between the front and back panels, a movable guide body between the front and back panels, a generally semi-arcuate cord guide surface defined by the guide body around which the cord may run, a guide body support extending from the guide body, a hollow sleeve secured between the front and back panels; and receiving the guide body support therein, a resilient member between the guide body and the sleeve, the guide body being movable towards the sleeve against the resilient member and, a cord abutment located between the front and back panels, and oriented so as to obstruct the cord from passing around the guide body, when the guide body is in a first position, and the abutment being out of obstructive engagement when the guide body is moved ag

Abstract: Traditional fixing of raising cords on pleated blinds occurs by sewing plastic flaps in place that hold knots on the raising cords. Adjustment of tension in the raising cords is difficult, because it may be required to loosen the knot and re-tie it in a better location. Loosening and re-tying is avoided in that a plastic clip has slits, in which the raising cords are pinched and locked after being wound 1½ turn around an interjacent tongue in the plane of the plastic clip.

Abstract: An adjustable cord restraining device for a blind assembly having a head rail, a bottom rail and at least one pull cord extending through a cord passage of the head rail and coupled to the bottom rail includes an annular member sufficiently sized to prevent entry of the annular member into the cord passage of the head rail and further travel of the pull cord through the head rail. A method of preventing the further extension of a pull cord includes obtaining an annular member sized larger than a pull cord passageway of a head rail pinching a mid-section of the pull cord and inserting the pinched portion of the mid-section through the annular member, forming a loop with the pull cord, inserting a free end of the pull cord through the loop to form an adjustable knot.

Abstract: A cord drive mechanism to convert linear motion to circular motion for use in coverings for architectural openings. Various controls are used to provide a braking force on the cord. Some of the embodiments incorporate a capstan.

Abstract: A blind slat controller with braking function for rotating and locating blind slats at a certain light obstruction angle. The blind slat controller includes and a base seat and a cord reel having a protruding push body. The push body serves to push a coiled spring to unbind or bind a hub section of the base seat, whereby the cord reel is permitted to rotate or is braked and prevented from rotating. When unbound, a slat control rod can be driven and rotated to control the rotational angle of the blind slats. After the blind slats are rotated to a predetermined light obstruction angle, the cord reel stops rotating. At this time, due to the coiled spring's own elasticity, the coiled spring is restored to again bind the hub section. Accordingly, the cord reel is prevented from rotating to locate the blind slats at the predetermined light obstruction angle.

Abstract: A safety release device for Roman blind pull cord is disposed between the control pull cord of the Roman blind and a lower suspension thereof. The safety release device includes a latch body for connecting with the pull cord, a latch ring seat connected with the lower suspension of the Roman blind, and a connection barrel. The latch body can be plugged into and latched with the connection barrel or extracted out of the connection barrel. The latch body has a latch force greater than the weight of the suspended Roman blind. When an abnormal pulling force greater than the latch force between the latch body and the connection barrel is applied to the pull cord in any direction, the latch body will be easily extracted out of the connection barrel to avoid tangle of the pull cord with a kid and ensure safety in use of the Roman blind.

Abstract: A cord lock for window coverings has one or more cams adjacent a locking surface over which a one or more lift cords travel. The cams may be spring biased to a locked position in which they press the lift cords against the surface. A release member through which the lift cords pass is provided. Transverse movement of any cord passing through an opening in the release member moves the release member from a first position, in which the cam or cams are in the locked position, to a second position at which a cam engaging portion of the release member engages the cam and the cam is in the unlocked position. Movement of the release member from the first position to the second position maintains the cam in the unlocked position.

Abstract: A cord guide system for extending the life of cords in a covering for an architectural opening provides long wear surfaces made of metal or ceramic which can be retrofitted into existing cord lock systems or molded into the system. The invention provides such long wear surfaces that can be used with different cord drive systems each of which permit an operator of a covering to manipulate the covering between extended and retracted positions while locking the covering in any position between fully extended and fully retracted. Cord guide surfaces are preferably made of metal or ceramic which are harder than conventional base materials used in cord lock systems and further have higher melting temperatures than either the base material for the cord lock system or the polyester cords conventionally used in coverings for architectural openings. In this manner, wear of the cord lock itself is minimized which in turn minimizes the wear of the lift cords and extends the life thereof.

Abstract: A cord lock of the window blinds or shade includes a box having a chamber therein, an engaging block on an outer side, a first opening for a cord exiting the box, a second opening for the cord entering the box, a fixed locking portion on the outer side, and a flexible locking portion opposite the fixed locking portion; and a movable driving wheel, which is received in the chamber of the box, to be moved between a lock position, in which the movable driving wheel is moved toward the engaging block to clip the cord therebetween, and a release position, in which the movable driving wheel is moved away from the engaging block to release the cord. The fixed locking portion provides the box fixing to the top rail with a strong strength, and the flexible locking portion provides an easy way to mount the box on the top rail.

Abstract: A dual shade apparatus comprises a first shade, which may be a Roman or natural woven shade, and a second shade, which may be a cellular shade, coupled to each other in a back-to-back arrangement with one or more dual channeled couplers. Any lift cords employed in the apparatus are concealed in between the pair of shades so as to prevent any direct contact. No portion of any employed cords is exposed or accessible for direct or inadvertent contact, thereby enhancing safety in operating the apparatus. The coupler has a double-C configuration to receive corresponding retaining mechanisms of the front and rear shades. A head rail houses a lifting mechanism. Each lifting cord extends from the lifting mechanism, in between the two shades, and down to a bottom rail. The dual shades are drawn down or retracted in unison by pulling or pushing up the bottom rail.

Abstract: A safety cord release for a window covering has a top section, a middle section, and a bottom section from a top to a bottom thereof. The safety cord release has a right case and a left case combined with the right case. There are several pairs of couplers on the right case and the left case located at the top section, the middle section and the bottom section respectively for engagement to reduce a transverse force from cords and to separate the right case and the left case immediately to release the cords for safety.

Abstract: A child safety blind having a head rail, a bottom rail, at least one ladder tape, a plurality of slats, a tilt wand and a pair of registry clips. At least one ladder tape extends horizontally between the head rail and the bottom rail, and the ladder tape comprising a plurality of steps. The slats extend horizontally between the head rail and the bottom rail, and each of the slats extends through one corresponding step of the ladder tape. The tilt wand is linked with ladder tape and operative to operative to drive the steps of the ladder tape to turn the slats with an angle. The pair of registry clips is operative to lift the bottom rail and the slats at two side portions thereof while holding the bottom rail and the slats therein.

Abstract: A cord drive mechanism to convert linear motion to circular motion for use in coverings for architectural openings. Various controls are used to provide a braking force on the cord. Some of the embodiments incorporate a capstan.

Abstract: A window covering includes an at least partially light occluding layer that can be attached to a lintel at an upper end and with a bottom rail at a lower end that can be moved to selectively cover the window. Cords are fixed to the upper end of the layer and extend past the bottom rail. The bottom rail includes a friction module which applies sufficient friction to the cords to keep the bottom rail fixed to the cords unless additional forces are applied to the bottom rail to move the rail. A pair of engagement surfaces are spring biased against the cords to apply friction forces. A lever acts on the springs to adjust for variations in friction forces so that the bottom rail remains horizontal. The bottom rail is formed of a closable structure with a cap hinged to a base for ease in forming the bottom rail.

Abstract: A Venetian blind and a control mechanism therefore, comprising a plurality of slats suspended from a headrail by lift cords, the control mechanism comprising a hollow rod articulated to the headrail and accommodating the lift cords extending to a elevation assembly manipulable by an actuator slidingly received over the rod. Upward displacing of the actuator entails lowering of the slats and downwards displacing of the actuator entails raising of the slats, and a friction mechanism for arresting the slats at any respective elevation.

Abstract: A cord lock for window coverings has one or more cams adjacent a locking surface over which a one or more lift cords travel. The cams may be spring biased to a locked position in which they press the lift cords against the surface. A release member through which the lift cords pass is provided. Transverse movement of any cord passing through an opening in the release member moves the release member from a first position, in which the cam or cams are in the locked position, to a second position at which a cam engaging portion of the release member engages the cam and the cam is in the unlocked position. Movement of the release member from the first position to the second position maintains the cam in the unlocked position.

Abstract: A cord lock for a Venetian blind or a shade disclosed has a housing having two parallel sidewalls, an end wall, a downwardly facing surface of the ramp members is formed with a plurality of transverse ribs; an opening is formed by the sidewalls, the end wall and the downwardly facing surface of the ramp members; a separator extends between the end wall and the ramp members; a pulley roller is rotatably mounted on a shaft supported in the sidewalls; a cylindrical floating roller formed on its peripheral surface with a plurality of ribs extending in a direction parallel to own axis; a top of the opening through which lift cords may pass freely to the pulley roller and then through the opening and then through different sides of the separator and then be completed as free hanging ends of pull cords; pushing means placed on the housing and having a mechanical contact with the pull cords on spots facing to the end wall and pushing the pull cords towards the cylindrical floating roller permanently.

Abstract: A window covering lifting control apparatus includes a holding unit, a locating set and a pushbutton. The holding unit has a first spacer and a second spacer formed thereon that are spaced from each other. The spacers have two slots inclining downwards. The first spacer has a strut on one side to be coupled with a spring on an outer side. The locating set includes two gears, two locating rods, two locating heads and a spring assembly to hold the two gears between the spacers. The pushbutton is movably coupled on the strut of the holding unit to control movement of the two gears in the slots. The window lifting control apparatus can be installed in a lower elongated member to control retraction upward or extension downward of the window covering. The two gears of the locating set can engage with and latch a lift cord assembly to provide improved locating effect.

Abstract: A cord lock apparatus of a window shade is provided, which includes a base, a panel structure, and a cord gripping device. The base includes an adjustable portion allowing cords to pass through and a first-direction ascending opening is formed allowing the cords to be alternatively positioned. The panel structure having an insert plate and a second-direction ascending opening is provided allowing cords to pass through, when the cords are selectively positioned along the inclined surface, the panel structure is moved in a vertically upward or downward motion. The cord gripping device has an engaging block and a knurled roller, the engaging block is removably attached within the accommodation recess. The knurled roller is positioned near the top of the engaging block and a gap is formed therebetween, such that the knurled roller is frictionally locked with or released from the cords when the panel structure moves vertically downward or upward.

Abstract: To provide an on-failure blind stopper system that allows reduction of depth of a head box and can be surely activated. A slider capable of moving vertically is disposed in a head box. The slider is pressed by a lifting/lowering cord and prevented from moving upward to permit a rotation shaft to rotate when the lifting/lowering cord is under tension. On the other hand, the slider moves upward to engage with the rotation shaft to prevent the rotation of the rotation shaft when the lifting/lowering cord sags.

Abstract: The present invention relates to a kind of curtain body positioning control structure for the window curtain, there is a shaft extruding from the side fixing base of such window curtain coupling with the bead-chain driving mechanism, locking device and fixing base respectively, wherein the said locking device consisting of top push block and locking block, thereat the combination of locking device with locking block is maintaining an elastic condition, due to such locking block is pushed against a spring, in addition, said fixing base is connected to the said locking device with rolling beads particularly, and in this way while such window curtain is being opened or closed by means of bead-chain driving mechanism, a gap between the said locking device and said shaft will be formed with the spring action thereto and hence reducing lots of detent force accordingly, therefore it has an advantage of easy operation; when the curtain is stopping operation, the locking device would be swiveled reversely as well as d

Abstract: A cord lock apparatus of a window shade is provided, which comprises a base, a panel structure, and a cord gripping device. The base includes an adjustable portion allowing cords to pass through and a first-direction ascending opening is formed allowing the cords alternatively positioned. The panel structure having an insert plate and a second-direction ascending opening is provided allowing cords to pass through, when the cords are selectively positioned along the inclined surface, such panel structure is moved in a vertically upward or downward motion. The cord gripping device has an engaging block and a knurled roller, such engaging block is removably attached within the accommodation recess. The knurled roller is positioned near the top of the engaging block and a gap is formed therebetween, such that the knurled roller is frictionally locked with or released from the cords when the panel structure moves vertically downward or upward.

Abstract: A pull cord device for controlling raising and lowering of a base rail of a window covering includes a locking wheel having a toothed segment turnable between locked and unlocked positions to engage and disengage from a cord spool, respectively, a cord-release controlling member having a cord retaining region to engage a pull cord to be movable along a linear running path when the pull cord is pulled in the unlocked position, a guideway disposed in the locking wheel, and including an angularly extending first route and a looped route, a guided member having a key end disposed in the guideway, and a linkage coupling the controlling member with the locking wheel such that when the controlling member is moved, the locking wheel is turned from the locked position to the unlocked position, and such that, in the unlocked position, the cord retaining region remains unmoved in each of regions in the looped route.

Abstract: A vertical cellular blind includes a headrail having first and second tracks; a fabric carriage including a trolley translatable along one of the tracks and a fabric stem releasable connected to the trolley; a cellular fabric panel connected to the fabric stem; a vertical rail bracket translatable along the other of the tracks in the headrail and including a component angularly adjustable relative to the headrail; a vertical rail attached to the panel and connected to the vertical rail bracket; a cord having ends secured in the headrail and extending through the panel and the vertical rail; and a locking handle in the vertical rail having the cord extended therethrough and releasable pinching means in the handle for engaging the cord.

Abstract: A window shade lift cord apparatus includes a seat, a control switch and a cord assembly. The seat has an aperture on the bottom and axles in the interior. The control switch includes an anchor member and a depressing member that are movably coupled together and interposed by an elastic element. The anchor member and the depressing member have respectively two through holes and two openings. The cord assembly has cords treading through the aperture of the seat, through holes and openings of the anchor member and depressing members such that the lower ends of the cords are gathered beneath the seat. Retracting of the window shade can be accomplished rapidly and simply.

Abstract: A safety mechanism for a window blind includes a fixing member mounted to a head rail of the window blind, and a clamping member connected to a second end of a lift cord of the window blind. The clamping member includes a C-shaped ring portion normally compressively clamped around a protruded portion of the fixing member. When the second end of the lift cord is subjected to an exceeded downward load, the C-shaped ring portion is forced to separate from the protruded portion and accordingly disengages the lift cord from the head rail. Therefore, an accident possibly caused by a lift cord wound around and tightened against a child's neck may be avoided to ensure safe use of the window blind.

Abstract: A window blind lock assembly includes a dog pivotally mounted in a casing to prevent movement of a blind string relative to the casing. The dog is resiliently biased to lock the string in the casing. A lever is pivotally mounted in the casing, and coupled to the dog and string. As the string is pulled, the lever rotates the dog to release the string. Conveniently, the string need not be pulled in any specific direction to release the dog.

Abstract: A safe disengaging device for the pull cord of a blind includes a male support base and a female support base. The male support base is fixed on the upper frame of a blind and provided with a protruding clasping block having its upper side formed with an engage shoulder. The female support base has its lower end tied with a pull cord and its upper end extending upward to form an elastic member corresponding to the clasping block of the male support base and having its upper free end formed with an engage hook to be engaged on the engage shoulder. When the pull cord is drawn by an excessively great force, the elastic member will be disengaged from the engage block, and the female support base together with the pull cord will fall off, avoiding accidents caused by improper operation of the pull cord and elevating safety in use.

Abstract: The invention is directed to a temporary window covering that may include a pleated cover formed from a sheet of material having a plurality of horizontal creases extending across the width of the sheet thereby defining a plurality of pleats, a bottom rail attached to a bottommost pleat of the pleated cover, and a first lift cord having a first end connected to the bottom rail, with the first lift cord being threaded upwardly through holes of the pleats of the pleated cover. The temporary window covering may also include a first cord guide and a cord lock, both of which may be include a throughbore for slidably engaging the first lift cord when the first lift cord is disposed therein, and a slot for retentively engaging the first lift cord when the first lift cord is disposed therein to support the weight of the bottom rail and an accumulated portion of the pleated cover.

Abstract: A cord lock for window coverings has one or more cams adjacent a surface over which a one or more lift cords travel. The cams are spring biased to a locked position in which they press the lift cords against the surface. A cam lock with a release cord is provided which engages and moves the cams from a locked position to an unlocked position in which the lift cords are free to move through the cord lock. The cord lock is always in a locked position whenever neither the lift cords are being pulled to raise the blind nor the release cord is being pulled to lower the blind.

Abstract: An improved curtain hoisting apparatus is wedged to a left end of a track and mainly includes a gear located on the bottom of an anchor body. The gear has a spindle pin movable in an m-shaped channel formed on an inner side of a wedge plate. The spindle pin is allowed to move and anchor in a first channel of the m-shaped channel to loosen a curtain cord for hoisting the curtain panel to a selected elevation. Pulling the curtain cord one more time allows the spindle pin moving from the first channel towards a second channel until anchoring at an outer rim at the left side of the m-shaped channel to brake the curtain cord thereby to halt the curtain panel at the selected elevation. Pulling the curtain cord repeatedly, the curtain panel may be hoisted and halted alternately and easily at selected elevations.

Abstract: A pull cord control device for Venetian blind includes a mounting body made up of an engagement piece having symmetrical registration posts for positioning rollers to be mounted thereto, and a limiting piece equipped with a pair of teeth racks symmetrically extending at both sides thereon in mesh with a control gear disposed at one side thereof to define a confinement space there-between for a coupling post with an embossed mounted thereto to be located in the middle thereof. A U-shaped groove is vertically indented at the inner side of the limiting piece therein for a U-shaped and metallic protection rod to be located therein and abutted against the upper edge of the confinement space thereof A decoration lid of an oval shape with a pull-cord passage slot disposed thereon is integrally formed at one end of the limiting piece thereof with the protection rod exposed precisely at the inner lower edge of the pull-cord passage slot thereof.