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[0001]    This application is a divisional application of, and claims priority to, U.S. patent application Ser. No. 13/035,222, entitled “Cordless Blind System and Retro-Fit Method”, filed Feb. 25, 2011, which claims the benefit of provisional patent application Ser. No. 61/309,426, entitled “Cordless Blind System and Retro-Fit Method”, filed Mar. 2, 2010, and provisional patent application Ser. No. 61/325,807, entitled “Cordless Blind System and Retro-Fit Method”, filed Apr. 19, 2010, provisional patent application Ser. No. 61/353,653, entitled “Cordless Blind System and Retro-Fit Method”, filed Jun. 10, 2010, and provisional patent application Ser. No. 61/411,336, entitled “Cordless Blind System and Retro-Fit Method”, filed Nov. 8, 2010, the disclosures of which are hereby incorporated herein by reference in their entireties. 
     
    
     FIELD OF THE DISCLOSURE 
       [0002]    The present invention relates to cordless window and architectural passage coverings. In one aspect, the invention relates to an enclosed drive system for use in conjunction with a pull cord extending from a headrail of an architectural cover. In another aspect, the invention relates to a method for retro-fitting an architectural cover pull cord assembly including a pull cord associated with a cord lock and extending from a headrail of the architectural cover. More generally, the invention provides solutions for blinds, shades and other architectural coverings that would otherwise have an exposed hazardous loop. 
       BACKGROUND 
       [0003]    In the provision of window and architectural passage coverings, the art has long relied on cords, string or the like to extend and retract the coverings. Such coverings take many forms, including shades such as curtains, roll-up shades, Venetian blinds, vertical blinds, cellular shades, and the like. A primary problem with such coverings that rely on cords is that small children can become entangled in the cords and experience serious harm, including strangulation and death. On Aug. 26, 2009, the U.S. Consumer Product Safety Commission announced a voluntary recall of all ¼ inch Oval Roll-up Blinds and Woolrich Roman Shades, including some 4.2 million roll-up blinds and 600,000 Roman shades, (http://www.cpsc.gov/cpscpub/prerel/prhtml109/09324.html). The Commission referenced the hazard that “[s]trangulations can occur if the lifting loops slide off the side of the blind and a child&#39;s neck becomes entangled on the free-standing loop or if a child places his/her neck between the lifting loop and the roll-up blind material.” Recent cited injuries include a report that “[i]n November 2007, a 1-year-old boy from Norridgewock, Maine became entangled and strangled in the lift cord loop of a roll-up blind that had fallen into his portable crib. In October 2008, a 13-month-old boy from Conway, AR was found with his head between the exposed inner cord and the cloth on the backside of a Roman shade. The cord was not looped around the boy&#39;s neck but rather ran from ear to ear and strangled the child.” Numerous manufacturers and retailers have followed the recall. Additional information may be found at: (http://www.windowcoverings.org). 
         [0004]    In addition to the internal cords attached to the shade or blinds that can be pulled out and pose a problem, the pull cords, string and beaded cords in mechanical-based blinds and shades that are pulled on to draw up the blinds or shades also pose a risk since they also create a hazardous loop of sufficient diameter (12 inches according to the Consumer Product Safety Commission) for a small child to get their head tangled inside. The retrofit devices currently available (http://www.windowcoverings.org/how_to_retrofithtml) do not eliminate the hazardous loops created by the beaded cords even if they are tied to the wall with a tie-down device such as a Rollease™ product or with separated draw strings and/or cord stops that could still become tangled together to create a hazardous loop. 
         [0005]    U.S. Pat. No. 5,472,035 discloses a window blind lift cord operating mechanism incorporated into the twist wand that rotates to control tilting of blind slats, wherein the operating mechanism for raising and lowering the blind and locking the blind in adjusted positions includes a lift member mounted for movement along an outer side of the wand that drives an engaging member inside the wand that engages the lift cords that also extend into a lengthwise cord passage inside the wand. The disclosed operating means also includes a lock means for locking the lift cord engaging member at selected positions along the wand. One problem with this configuration is the obvious entanglement issues that would result with the lift cords internal to a wand that is rotated to control tilting of the blind slats, wherein securing the cord within the rotating wand almost guarantees entanglement. In addition, the weight and force required to lift the bottom rail along with the blind slats would create a significant burden on the rotating gears that open and close the blind slats including the entire attachment of the wand to the headrail. 
         [0006]    In consequence, the art is in need of improvement in coverings for architectural openings that maintains the functionality and aesthetics of previously developed coverings, but avoids their deficiencies, particularly their hazardous character regarding the risk of injury or death associated with the use of cord arrangements. The art also is in need of a new structural “fix” for the lifting mechanism of shades and blinds that avoids creating a hazardous loop. 
       SUMMARY 
       [0007]    The present invention relates to cordless architectural coverings, and assemblies and subassemblies thereof, as well as to retrofit apparatus, components and methods in which a cord loop enclosure for shades and blinds is employed to replace looped beaded cords, pull cords, and strings that drive rolling mechanisms to draw up the blinds or shades. 
         [0008]    In one aspect, the invention relates to a mechanism for disabling the cord lock found in many blinds and shades that allows a user to draw up and “lock” the blind or shade in an open, closed or in-between position. 
         [0009]    In another aspect, the invention relates to an enclosure or sheathed apparatus coupled with a drive mechanism to encase a pull cord on a blind or shade system, for the purpose of avoiding exposed cords capable of creating a hazardous loop. 
         [0010]    In a further aspect, the invention relates to an enclosed pulley system and method of retro-fitting an existing blind or shade with such enclosed pulley system. 
         [0011]    In another aspect, a loop cord control enclosure is disclosed to encase a looped cord attached to the shade or blind system at a top part thereof to drive the rolling mechanism that raises and lowers the shade or blinds. The cord is encased to protect any hazardous loops from being exposed, and the cord is engaged internally with one or more drive mechanisms, with at least one attached to a handle to allow an operator to draw the cord and shade/blind up and down. The mechanism is adapted to be retrofitted on an existing shade/blind or originally fit on any of the systems described above. In one embodiment, the loop cord enclosure is attached at the headrail, includes a cord lock disablement mechanism to disable the cord lock to allow the cord and shade/blind to freely open and close without locking, and wherein the cord is encased in the enclosure with at least one drive mechanism coupled to a handle to drive the system. 
         [0012]    A further aspect of the invention relates to a drive system for use in conjunction with a lift or pull cord extending from a headrail of an architectural cover, such drive system including: an enclosure adapted to conceal at least a portion of the pull cord; a first drive mechanism in the enclosure, adapted to engage the pull cord, and coupled to a handle mechanism for manual operation; a bracket adapted to connect the enclosure to the headrail of the architectural cover; and a cord lock disablement mechanism for disabling a cord lock of the architectural cover. 
         [0013]    In various further implementations, the invention relates to a drive system wherein the first drive mechanism yields a handle to pull cord power ratio of 2:1 by use of at least one pulley or pulley-like apparatus. In an alternative implementation, the cord could instead be attached directly to a handle mechanism directly to effectuate a pull cord power of 1:1. In other implementations, the invention relates to a second drive mechanism adapted to engage the pull cord, wherein the second drive mechanism yields a handle to pull cord power ratio of 4:1. In other implementations, the invention relates to a handle mechanism that further includes a drive mechanism that is either a sleeve adapted to slide along the outside of the enclosure or a slider devise adapted to traverse the interior of the enclosure. In yet other implementations, the invention relates to a handle that further comprises a tension or stop mechanism adapted to secure the handle in position at one or more points along the enclosure. 
         [0014]    In the 1:1 pull cord power system, the handle may include a cord lock to secure the cord and a cam lock slider or tension mechanism to secure the handle at any one position along the shaft to raise and lower the blind or shade and keep it at a desired position anywhere in between. In other implementations, the invention relates to a tension or stop mechanism that further comprises at least one release button to allow the handle to be moved along the enclosure, wherein the release button must be pressed to effectuate movement of the handle and corresponding drive mechanism. In still other implementations, the invention relates to a locking mechanism adapted to lock the handle in position at one or more points along the enclosure. In other implementations, the invention relates to a handle that further comprises a counter-weight mechanism adapted to lessen the force required to move the handle. In other implementations, the invention relates to a handle coupled to a spring and adapted to lessen the force required to move the handle. In other implementations, the invention relates to a cord lock disablement mechanism comprising a clamp adapted to fit within an opening in the headrail proximate to where the pull cord extends from the headrail. 
         [0015]    A further aspect of the invention relates to a method for retro-fitting an architectural cover pull cord assembly including a pull cord associated with a cord lock and extending from a headrail of the architectural cover, such method comprising: disabling the cord lock; engaging the pull cord extending from the headrail with a drive mechanism coupled to a handle for manual operation; and enclosing the drive mechanism in an enclosure that also conceals at least a portion of the pull cord. 
         [0016]    A still further aspect of the invention relates to a drive system for use in conjunction with one or more lift cords extending from a headrail of an architectural cover, said drive system comprising: an enclosure adapted to conceal at least a portion of at least one lift cord; a first drive mechanism in the enclosure, adapted to engage the at least one lift cord, and coupled to a handle mechanism for manual operation; and a bracket adapted to connect the enclosure to the headrail of an architectural cover, wherein the bracket includes a locking mechanism adapted to secure the at least one lift cord in place. 
         [0017]    A still further aspect of the invention relates to a drive system for use in conjunction with one or more lift cords extending from a headrail of an architectural cover, said drive system comprising: an enclosure adapted to conceal at least a portion of at least one lift cord and arranged to be secured to a headrail of an architectural opening; a first drive mechanism in the enclosure, adapted to engage the at least one lift cord, and coupled to a handle mechanism for manual operation; a handle coupled to the first drive system; and a counterweight mechanism coupled to the first drive mechanism and adapted to secure the handle in position at one or more locations along the enclosure. 
         [0018]    A still further aspect of the invention relates to a drive system for use in conjunction with one or more lift cords extending from a headrail of an architectural cover, said drive system comprising: an enclosure adapted to conceal at least a portion of at least one lift cord and arranged to be secured by a hinge to a headrail of an architectural opening; a first drive mechanism in the enclosure, adapted to engage the atleast one lift cord, and coupled to a handle mechanism for manual operation; and wherein the hinge activates a locking mechanism adapted to secure the at least one lift cord in place. 
         [0019]    In various further implementations, the invention relates to a method for retro fitting an architectural cover pull cord assembly, comprising securing the pull cord to a fixed position during the engagement with the drive mechanism. In other implementations, the invention relates to a method further comprising connecting a clamp to the headrail, wherein the clamp is adapted to attach the enclosure to the headrail. In other implementations, the invention relates to the method further comprising fastening a cap to the top of the enclosure. In yet other implementations, the invention relates to the method wherein the fastening of the cap secures the pull cord to the enclosure. In other implementations, the invention relates to the method wherein the cap is adapted to connect with the clamp. In still other implementations, the invention relates to the method wherein the cap is adapted to fit within an opening in the headrail proximate to where the pull cord extends from the headrail. In other implementations, the invention relates to the method wherein the cap further includes a cord lock disablement mechanism for disabling the cord lock. 
         [0020]    In still further implementations, the invention may include a pull strip for pulling a loose lift or draw cord from an existing assembly into the enclosure for coupling to or engaging with a drive system, particularly in a retro-fit system. Another implementation of the invention relates to a cam apparatus coupled to the handle, wherein rotating the handle also rotates the cam to expand calipers to lock the handle and corresponding shade/blind in place at any desired point. Another aspect includes the cord lock that has an extension to keep the top cap and/or bracket from sliding along the shade/blind headrail, particularly by including a matching gap, hole or space to accommodate the extension of the cord lock. 
         [0021]    In still yet a further implementation, the invention has a cord lock mechanism that pinches the cord, a handle that actuates the cord lock mechanism, and a driving mechanism having a cord guide that engages the cord and a slider that slides along the handle to actuate the cord while the cord is enclosed within an enclosure defined by the handle. 
         [0022]    Other aspects, features and embodiments of the invention will be more fully apparent from the ensuing disclosure and appended claims. 
         [0023]    Those skilled in the art will appreciate the scope of the present disclosure and realize additional aspects thereof after reading the following detailed description of the preferred embodiments in association with the accompanying drawing figures. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING FIGURES 
         [0024]    The accompanying drawing figures incorporated in and forming a part of this specification illustrate several aspects of the disclosure, and together with the description serve to explain the principles of the disclosure. 
           [0025]      FIG. 1  is a perspective view of an illustrative prior art common blind system. 
           [0026]      FIG. 2  is a close-up view of a prior art cord lock system. 
           [0027]      FIG. 3  is a representative view of the internal workings of an enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover. 
           [0028]      FIG. 4  is a representative top-down exploded view of an enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover. 
           [0029]      FIG. 5  is a representative bottom-up exploded view of an enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover. 
           [0030]      FIG. 6  is a representative view of an enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover. 
           [0031]      FIG. 7  discloses a representative exploded view of an enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover. 
           [0032]      FIG. 8  is a representative view of an enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover with the enclosure secured via a multi-directional attachment to the mounting bracket. 
           [0033]      FIG. 9  is a representative view of an enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover, wherein the enclosed drive system utilizes a cam lock slider. 
           [0034]      FIG. 10  is a representative view of cam lock slider and cam of the handle as disclosed in various embodiments from a closed or locked position to an open or unlocked position. 
           [0035]      FIG. 11  is a representative view of pull strip for drawing the lift cord through the enclosed drive system. 
           [0036]      FIG. 12  is a representative view of the drive mechanism being engaged with the enclosure. 
           [0037]      FIGS. 13A-D  are representative views of the installation of a cord lock disablement device installation. 
           [0038]      FIG. 14  is a representative view of an enclosed drive system being installed on a headrail. 
           [0039]      FIGS. 15 and 16  disclose various other embodiment, particularly including a cord lock mechanism  137  located near the headrail to pinch the cord  10  when in a relatively vertical position  143  and unlock the cord  10  when in a predetermined angle  144  from the relatively vertical position. 
           [0040]      FIG. 17  illustrates a another embodiment of a cord lock mechanism, a handle, and a drive mechanism for actuating a cord in a blind system. 
           [0041]      FIG. 18  shows a cross sectional view of the cord lock mechanism. 
           [0042]      FIG. 19  shows a view of the handle separated from a headrail in the blind system. 
           [0043]      FIG. 20  shows a top view of the handle attached to the head rail. 
           [0044]      FIG. 21  shows an exploded view of the driving mechanism and the handle. 
           [0045]      FIG. 22  is a top view of the driving mechanism and the handle. 
           [0046]      FIG. 23  is an exploded view of the bottom of the handle. 
           [0047]      FIG. 24  is a cross-sectional transparent view of the bottom of the handle. 
       
    
    
     DETAILED DESCRIPTION 
       [0048]    The embodiments set forth below represent the necessary information to enable those skilled in the art to practice the embodiments and illustrate the best mode of practicing the embodiments. Upon reading the following description in light of the accompanying drawing figures, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not particularly addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure and the accompanying claims. 
         [0049]    The present invention relates to cordless or encased corded drive systems for architectural covers for architectural openings, such as windows, doors or the like. 
         [0050]    The term “enclosure” or “housing” as used herein refers to any elongated encasement (wand) of one or more lift cords that may be coupled with one or more drive mechanisms to deter or preclude access to the cords by a human, particularly a child. The enclosure or enclosed drive system may include one or more openings to allow for a handle exterior to the encasement to be coupled to or engaged with the drive mechanism internal to the encasement for driving the pull cords along the encasement. 
         [0051]    The term “drive mechanism” as used herein refers to any apparatus capable of engaging one or more lift cords, and optimally adapted to fit within an enclosure or enclosed drive system. In one embodiment, the drive mechanism may allow direct secured attachment of the cord thereto in a 1:1 ratio of drive mechanism to bottom rail of the window covering with which the other end of the pull cords are attached. In a separate embodiment, the drive mechanism may act as a pulley or group of pulleys, wherein the pull cord is secured in the enclosure or enclosed drive system, or within the headrail, to allow a 2:1 or greater ratio of drive mechanism to bottom rail of the window covering. The dive mechanism in various embodiments may be secured to a handle that is exposed exterior to the enclosure or enclosed drive system to allow a user to operate the drive mechanism to raise and lower the window covering. 
         [0052]    The term “cord lock disablement mechanism” as used herein refers to any device capable of keeping the cord lock mechanism from raising upon a retraction of the pull cord back into the headrail once the weight of the blinds pulls upon the cords, or may simply include a removal of the cord lock. 
         [0053]    The term “drive system” as used herein refers to one or more embodiments of the present invention. 
         [0054]    The term “architectural cover” includes any cover known to one of skill in the art for an architectural opening, including but not limited to Venetian blinds, roman shades and the like. 
         [0055]    The advantages and features of the invention are further illustrated with reference to the following disclosure, which is not to be construed as in any way limiting the scope of the invention, but rather as being illustrative of embodiments of the invention in specific implementations thereof. Reference may be made herein to shades, blinds, and other types of architectural opening covers, but such references are not intended to be limitingly construed as regards the scope of the invention. 
         [0056]    Window blinds all generally work in a same or similar fashion. The blind is manipulated by pulling a lift cord or by pulling the covering itself. In the case of a lift cord, strings that connect to the bottom of the window covering are pulled by the cord. The bottom of the window covering moves higher as the cord is pulled and moves lower as the cord is released. The window covering often either folds, rolls or collapses. In applications such as Venetian blinds, the blinds must first be aligned so that they can be lifted and nested in a compacted form. 
         [0057]    Venetian blinds contain many individual blinds, called slats, which are generally maintained in an orientation parallel to each other. When the blind is fully lowered, the slats are generally the same distance apart and can all be turned at the same time in the same direction. When the slats are turned so that they are parallel to the window and all touching, most of the light from outside a window is blocked. Turning the slats perpendicular to the window allows light to pass through the open area between adjacent slats. 
         [0058]    Turning the slats is accomplished by turning a rod that rotates the slats up or down. Typically three sets of three strings run through each slat; and each set of strings operates in the same way. The middle string raises and lowers the blinds, while the outer two strings form a ladder with a slat on each rung. Turning the rod tilts the slats. Lifting the blinds lets the most amount of light through the window, since all the slats are moved out of the way. The slats generally must first be turned perpendicular to the window, which allows them to collapse against each other when the bottom of the blinds is lifted. When the lift cord is pulled, the blinds rise. 
         [0059]    To keep the blinds lifted at any given level, a cog often with teeth (cord lock) sits inside the rail into which the lift cord runs. When the lift cord is pulled towards the cog, usually towards the right when facing the blinds, the cog&#39;s teeth catch on the cord. When the lift cord is released, gravity causes the blinds to fall and the lift cord to retract. When the cog is caught on the lift cord, which then gets caught between the rail as well, the cog keeps the lift cord from retracting further and holds the blinds in place. Additionally, there must be some method for the lift cord to remain stationary once the window covering has been raised or lowered to the desired position. In some applications, the cord is wrapped around a hook fastened into the wall. 
         [0060]    Traditional blinds have 1-inch slats formed of aluminum, plastic or wood. Shade and blind systems are often supported by a headrail that may include rolled edges at the top, light blocking lip at the lower back side and a curved headrail face similar to the crown of a 1″ slat. Headrails are often open at the top similar to the conformation of a storm gutter. Headrails are often phosphate-treated steel and finished with a polyester primer and topcoat of polyester-baked enamel and measures 0.025″ in thickness. The bottom rail that lifts the blinds from the bottom is generally tubular-shaped and is often phosphate-treated steel with polyester primer and a top coat of polyester-baked enamel and measures 0.025″ in thickness. The slats that form the shaded portion of the blinds are frequently made of cold rolled aluminum alloy. The slats are nominally 1″ wide and available in standard 0.006″ or optional 0.008″ thickness and nominally ½″ wide by 0.006″ thick. 
         [0061]      FIG. 1  (PRIOR ART) of the present disclosure shows a prior art blind system that includes a headrail  1  that supports the blind system and a bottom rail  2  that is attached to the lift or pull cord  10  to draw up the blinds. Further shown is a cord lock  5  that is often a snap-in design with a stainless steel wear guard and a floating locking pin or cog  12 . A tilter  4  is shown that allows for tilting of the blind, either in a perpendicular or horizontal orientation, to let in a desired amount of light or to block the light in an architectural opening, wherein the tilter  4  works with a tiltrod  6  that is supported by a tiltrod support  7 . Tilting of the blinds may be effected by the exterior cords or ladders  9  that act on the periphery of the blind slats  3  by way of ladder drums  8  that are often low friction thermoplastic with smooth hole edges to position the ladders  9 . The lift cord  10  runs internally (of the 3 cords) through the blinds and up through the headrail, out to where a user can pull open the blinds or release them to a closed condition. Lift cords  10  are often made of braided polyester, measuring 1.4 mm in diameter. The snap-in brackets  11  are used to mount the blind system. 
         [0062]      FIG. 2  (PRIOR ART) shows a close-up view of a cord lock  5  mechanism, with a locking cog  12  that must be disabled in various embodiments of the present invention, particularly to retro-fit existing blind systems. Further shown is a cord guide  13  including a rotating wheel or other mechanism, to allow smooth traversing of the cord  10 . 
         [0063]      FIG. 3  is a representative view of the internal workings of an enclosed drive system for use in conjunction with a lift cord  10  extending from a headrail  1  of an architectural cover. The cog  12  of the cord lock  5  is often first disabled in existing blind systems to allow a free flowing cord  10  to raise and lower the architectural cover, wherein the disablement can be made by any suitable apparatus, such as a shank, hook, clip or other cord lock disablement mechanism  17  that is operative to keep the cog from raising when the weight of the blind/shade draws the cord  10  back into the headrail  1 . It should be apparent that the cog  12  and cord lock disablement mechanism  17  would be absent in new blind systems incorporating an enclosed drive system of the present invention. The cord lock disablement mechanism  17  can be inserted through the end  19  of the headrail  1  or through an opening  23  ( FIG. 5 ) where the cord  10  exits the headrail  1 . 
         [0064]    A bracket  18  may be secured to the headrail  1  to support the enclosure  20  and drive system. The bracket may be attached via a top cap  16 , coupler  29 , or similar means for securing the enclosure  20  to the headrail. The bracket  18  can either be slid on from one end  19  of the headrail  1  adjacent the cord lock mechanism  5  or alternatively clipped on with the use of a bracket  18  that either has one or more hinges  24  ( FIG. 6 ) and/or is flexible enough to allow manual snapping of the bracket  18  from its open end over the headrail  1  from the bottom or side where lip extensions  25  would secure the bracket  18  in place once it is secured over the headrail  1 . In the illustrative embodiment shown, the top cap  16  secures the cord(s)  10  at an end opposite the end(s) attached to the bottom rail  2  to draw up the blinds/shades, wherein the cord(s)  10  is engaged with a drive mechanism  15  coupled to the handle  14 , wherein the drive mechanism  15  can be comprised of a pulley wheel or semi-circular member sufficient to draw the cord  10 . As an alternative, the cord  10  can be locked, fastened or secured directly to the mechanism  15  coupled to the handle  14  so that a 1:1 ratio of handle pull to blind or shade draw is effectuated. 
         [0065]    The handle  14  is attached to the drive mechanism  15  to allow a user to manually operate the opening and closing of the blinds/shades. The handle  14  may include an assembly or mechanism for locking it in place, e.g., locking bars, cams, pegs, etc., together with tension mechanisms for tightening the handle  14  around the enclosure  20  at any specific location along its length. There may be more than one pulley to allow for greater force and less distance being required in the handle  14  to draw up the shades/blinds, where a single pulley allows for a 2:1 ratio of handle to blind distance and force; a two pulley system allows for a 4:1 ratio of handle to blind distance and force; and so on. The drive mechanism  15  may optionally run on inner rails  21  of the enclosure  20 . 
         [0066]      FIG. 4  is a representative top-down exploded view of an enclosed drive system for use in conjunction with a lift cord  10  extending from a headrail  1  of an architectural cover. The same representative elements of  FIG. 3  are shown here. The cord lock disabling mechanism  17  slides in from the side jn this embodiment. 
         [0067]      FIG. 5  is a representative bottom-up exploded view of an enclosed drive system for use in conjunction with a lift cord  10  extending from a headrail  1  of an architectural cover. The same representative elements of  FIG. 3  are shown here. The cord lock disabling mechanism  17  can enter in from the opening  23  in the headrail  1  in this embodiment. Also shown is the bottom cap  22  of the enclosure  20 ). 
         [0068]      FIG. 6  is a representative view of an enclosed drive system for use in conjunction with a lift cord  10  extending from a headrail  1  of an architectural cover. In this embodiment, a pull strip  30  is shown for engaging the end of the lift cord  10  during retro-fit of an existing blind system. During a retro-fit, an existing blind system&#39;s lift cord  10  would be cut near the headrail  1 , but with sufficient slack or length to allow the cord to be drawn into the enclosure  20  and likely back out near the top proximate to the top cap, where it may be secured with a cord lock mechanism  26 . The cord is then either pulled down and attached to the drive mechanism  27  for a 1:1 pull cord power system, or pulled down around a pulley based drive mechanism  27  and out the other side of the top of the enclosure  20  where it is secured in place for a greater than 1:1 system. For individuals who are shorter or for any other reason have difficulty reaching the handle  14  at a certain height, a greater amount of slack lift cord  10  can be drawn into the enclosure  20  to allow the drive mechanism  15  and handle  14  to begin drawing up the blind or shade at a much lower point along the shaft of the enclosure  20 , wherein the enclosure  20  can be extended to any necessary length. 
         [0069]    The pull strip  30  includes some means for engaging the cord  10 , whether it is an adhesive, separate cord, or similar apparatus so that it can be pulled into the enclosure  20 , around the drive mechanism  27  and out the other side and then detached once the cord  10  is secured to the enclosure. In the 1:1 drive system, the lift or pull cord  10  attached to the pull strip  30  is pulled out at a point adjacent or through the handle  14  and secured therein, either with a cap, clamp, or similar device such as a cord lock mechanism  26  that locks into a top cap  16  after the cord is pulled through. The top cap  16  is attached to the bracket  18  by any one of a number of means or coupler  29 , including via a D-ring as shown  29  in  FIG. 6 , a hinge, a ball and socket joint, a rivet, a toggle, a hook and eye, a clasp, a tie, or the like. A hinge ( FIG. 7 ) would necessarily allow a bi-directional movement of the shaft of the enclosure  20  towards and away from the blinds or shade, and a D-ring  29  would allow multi-directional movement. 
         [0070]    Additionally disclosed is a close pin shaped drive mechanism  27  that has a channel for the lift cord  10  to be pulled through by the pull strip  30 , and two semi-flexible extended caliper members  31  that partially encircle an oblong shaped cam type shaft  28  that is attached to the handle  14  so that when the handle  14  is rotated, the cam shaft  28  expands the caliper members  31  lock the drive mechanism  27  in place within the enclosure  20 . Such an enclosure  20  could additionally include the inner rails  21  as in the other enclosed embodiments, but are not necessary so long as interior of the enclosure can sufficiently permit the drive mechanism  27  to traverse the length of the enclosure and yet accommodate the pressure of the caliper members  31  as a result of the cam shaft  28  when in a locked position. 
         [0071]      FIG. 7  discloses an exploded view of an enclosed drive system attached to the headrail  1  of an architectural cover via a hinged bracket system. The unique cord lock disablement mechanism  17  in this embodiment is a hook that may be inserted through the opening  23  in the bracket where the lift cord  10  is exposed. The top cap  16  is attached to the bracket  18  via a second pin  34  that allows for bi-directional hinge movement. The bracket  18  is secured to the headrail  1  via the hinged wall portion  32  that is attached to the bracket via a first hinge pin  33 . A cord fastening mechanism  26  is provided after the lift cord  10  is run through the enclosure  20  and around or engaged with the drive mechanism  27  that may be locked in place with the cam shaft  28  of the handle  14 . The drive mechanism  27  may run the length of the internal rod enclosure  20  from the top cap  16  to the bottom cap  22 . 
         [0072]    A further example of the embodiment in  FIG. 7  along with the pull strip  30  as in  FIG. 6  is shown in  FIG. 8 . The embodiment of  FIG. 8  exemplifies one retro-fit system of the present invention as represented prior to installation. 
         [0073]    In  FIG. 9 , a particular embodiment of a drive mechanism  15  represented by the slide rail incorporating a pulley mechanism  27  which may also be described as a cam lock slider. The cam lock slider  27  includes two semi-flexible extended caliper members  31  for expansion when the cam  28  spreads them apart, forcing the calipers  31  to create pressure and friction within the enclosure  20  to stop the cam lock slider. Also enclosed is a spring steel string guide  35  that reduces friction as the lift cord passes around the cam lock slider  27 . 
         [0074]      FIG. 10  is a representative view of the handle  14  and the cam  28  in various positions, including locked where the calipers  31  are expanded, and unlocked where the calipers return to their normal position so that the cam lock slider  27  can freely move up and down the enclosure  20 . 
         [0075]      FIG. 11  is a representative view of a pull strip  30 , preferably made of mylar tape, for drawing the lift cord through the enclosed drive system. 
         [0076]      FIG. 12  is a representative view of the drive mechanism  27  being engaged with the enclosure  20 , wherein a fastener  36  is utilized to secure the two in place. 
         [0077]      FIGS. 13A-D  are representative views of the installation of a cord lock disablement device  17  installation. Also shown opposite the hook is an L shaped extension that engages the bracket  18  to keep it from sliding along the headrail  1  when installed. 
         [0078]      FIG. 14  is a representative view of the hinged embodiment of an enclosed drive system being installed on a headrail  1 . 
         [0079]      FIGS. 15 and 16  disclose various other embodiments, particularly including a cord lock mechanism  137  located near the headrail  1  to pinch the cord  10  when in a relatively vertical position  143  and unlock the cord  10  when in a predetermined angle  144  from the relatively vertical position. 
         [0080]      FIG. 17  illustrates yet another embodiment of a cord lock mechanism  146 , a handle  148 , and drive mechanism  150  for actuating a cord (shown in  FIG. 15 ) in a blind system  152 .  FIG. 18  shows a cross sectional view of the cord lock mechanism  146 . In this embodiment, a housing  154  of the cord lock mechanism  146  may define three vertically stacked channels  156 ,  158 ,  160 . The top channel  156  and the middle channel  158  each include cord guides  162 ,  164 . A cord locking member  166  is movably received within the bottom channel  160 . The cord locking member  166  may be a part of the handle  148 . When the handle  148  is relatively vertical, the cord locking member  166  is in a cord locking position which pinches the cord and prevents the cord from being actuated. 
         [0081]    Next, a hinge  168  may couple the handle  148  to the housing  154  which allows the handle  148  to be moved about the hinge  168 . Moving the handle  148  about the hinge  168  causes the cord locking member  166  to move within the bottom channel  160  or rotate outside of the bottom channel  160  into a cord release position that allows the cord to be moved. In this embodiment, the cord locking member  166  is moved to a cord release position when the handle  148  is moved about the handle  148  to an angle of approximately 15° or greater. This angle however may vary in other embodiments depending on factors such as the particular dimensions of the cord locking mechanism  146  or regulatory and standardization requirements. As in previous embodiments, the cord is guided within an enclosure  170  defined within the handle  148 . 
         [0082]      FIGS. 19 and 20  illustrate one method of attaching the cord lock mechanism  146  to the blind system  152 . To do this, a channel  172  is provided at the bottom of a cord control apparatus  174  in the cord lock mechanism  146 . The cord control apparatus  174  may be inserted through an aperture  176  defined in a headrail  178  of the blind system  152 . A bracket  180  defines an opening  182  which allows the bracket  180  to be slid into the channel  172  on the cord control apparatus  174  and thereby secure the cord lock mechanism  146  in the headrail  178 . Aperatures  184 ,  186  in the cord control apparatus  174  allow the cord to pass through the cord locking mechanism  146 . 
         [0083]      FIG. 21  illustrates the handle  148  and the drive mechanism  150  for actuating the cord. The drive mechanism  150  may include a slider  188 , a cord guide  190 , and a counterweight  192 . A cord guide shaft  194  may be utilized to attach the cord guide  190  to the slider  188 . A bracket  196  on the bottom of the slider  188  may be utilized to attach the counterweight  192  to the bottom of the slider  188 . 
         [0084]      FIG. 22  illustrates a top view of the handle  148  and the drive mechanism  150 . The handle  148  defines the enclosure  170  and a slit  198 . The slider  188  has an enclosure  200  and a sliding member  202  that may be attached to the enclosure  200 . The enclosure  200  may receive the handle  148  so that a portion of the handle  148  is enclosed by the slider  188  and the sliding member  202  is received within the slit  198 . In this manner, the slider  188  can slide along the length of the handle  148  while the cord guide  190  and the counterweight  192  are each enclosed within the enclosure  170  provided in the handle  148 . The cord may loop around the cord guide  190  so that the cord may be actuated to raise and lower the blind system  152  (shown in  FIG. 17 ) as the slider  188  is slid up and down the handle  148 . In this embodiment, the counterweight  192  may provide a gravitational counter force that counters the weight of the blind system  152  when the cord locking member  166  (shown in  FIG. 17 ) is placed in the cord release position. Other mechanisms, such as damping structures designed to provide the appropriate amount of friction, may also be utilized to counter the weight of the blind system  152 . 
         [0085]    Finally,  FIG. 23  illustrates a bottom cap  204  for the handle  148 .  FIG. 24  illustrates a cross sectional transparent view of the bottom cap  204  inserted into a bottom end of the handle  148 . 
         [0086]    The invention has been has been described herein in reference to specific aspects, features and illustrative embodiments of the invention, some of which are numerically disclosed below: 
         [0087]      1 . headrail of a blind system 
         [0088]      2 . bottom rail of a blind system 
         [0089]      3 . blind slats 
         [0090]      4 . tilter device for opening and closing the blind slats  3   
         [0091]      5 . cord lock mechanism 
         [0092]      6 . tiltrod 
         [0093]      7 . tiltrod support 
         [0094]      8 . ladder drums 
         [0095]      9 . ladders 
         [0096]      10 . lift cord(s) 
         [0097]      11 . snap-in brackets used to mount the blind system 
         [0098]      12 . cog of the cord lock  5   
         [0099]      13 . cord guide 
         [0100]      14 . handle 
         [0101]      15 . drive mechanism 
         [0102]      16 . top cap 
         [0103]      17 . cord lock disablement mechanism 
         [0104]      18 . bracket secured to the headrail  1  to support the enclosure  20   
         [0105]      19 . one end of the headrail  1  adjacent the cord lock mechanism  5   
         [0106]      20 . enclosure 
         [0107]      21 . inner rails of enclosure  20   
         [0108]      22 . bottom cap 
         [0109]      23 . opening in the headrail  1  for inserting cord lock disabling mechanism  17   
         [0110]      24 . one or more hinges on bracket  18   
         [0111]      25 . lip extensions of bracket  18   
         [0112]      26 . cord fastening mechanism separate from top cap  16   
         [0113]      27 . slide rail incorporating a pulley mechanism with locking apparatus engaged with an oblong shaped cam  28  of a handle  14   
         [0114]      28 . oblong shaped cam that expands calipers  29  of slide rail  27   
         [0115]      29 . coupler that attaches the enclosure  20  to the bracket  18  via the top cap  16   
         [0116]      30 . pull strip for cord  10   
         [0117]      31 . semi-flexible extended caliper members 
         [0118]      32 . hinge wall portion of bracket  18   
         [0119]      33 . first pin for hinge wall  32  of bracket  18   
         [0120]      34 . second pin to hinge to allow bi-directional movement of enclosure 
         [0121]      35 . spring steel string guide 
         [0122]      36 . fastener to secure top cap  16  and the enclosure  20  together 
         [0123]      115 . drive mechanism of alternate embodiment 
         [0124]      116 . top cap of enclosure or housing  120 , that may be adapted to secure cord(s)  10   
         [0125]      120 . enclosure or housing for drive system to conceal cord(s)  10   
         [0126]      126 . point where top cap  116  secures the cord(s)  10   
         [0127]      128 . axle of pulley mechanism  141  coupled to drive mechanism or slider bar  115   
         [0128]      137 . lock mechanism activated by a hinge  138  when the enclosure or housing 
         [0129]      120  is in a relatively vertical position  143 , and unlocked when at a predetermined angle  144  from the relatively vertical position 
         [0130]      138 . hinge mechanism attaching the enclosure or housing  120  to the headrail  1   
         [0131]      139 . axle of hinge mechanism  138   
         [0132]      140 . brushing of hinge mechanism  138   
         [0133]      141 . roller of pulley mechanism coupled to drive mechanism or slider bar  115   
         [0134]      142 . cord control apparatus to ensure smooth travel of cord into enclosure or housing  120  of drive system 
         [0135]      143 . relatively vertical position wherein the enclosure or housing  120  hangs when no external force is exerted thereon other than gravity; or relatively parallel to the Y axis as shown in  FIG. 15   
         [0136]      144 . predetermined angle compared with that of the relatively vertical position 
         [0137]      143 , wherein the lock mechanism  137  may be disabled in certain embodiments 
         [0138]      146 . cord lock mechanism having housing  154   
         [0139]      148 . handle 
         [0140]      150 . drive mechanism having a slider  188 , a cord guide  190 , a counterweight  192 , and a cord guide shaft  194   
         [0141]      152 . blind system having a headrail  178   
         [0142]      156 . hinge that movably couples the handle  148  to the housing  154  of the cord lock mechanism  146   
         [0143]      180 . bracket for attaching the cord lock mechanism  146  to the headrail  178 . 
         [0144]      204 . bottom cap inserted into a bottom end of the handle  148   
         [0145]    While the invention has been has been described herein in reference to specific aspects, features and illustrative embodiments of the invention, it will be appreciated that the utility of the invention is not thus limited, but rather extends to and encompasses numerous other variations, modifications and alternative embodiments, as will suggest themselves to those of ordinary skill in the field of the present invention, based on the disclosure herein. Any of various elements or features recited herein is contemplated for use with other features or elements disclosed herein, unless specified to the contrary. Correspondingly, the invention as hereinafter claimed is intended to be broadly construed and interpreted, as including all such variations, modifications and alternative embodiments, within its spirit and scope. 
         [0146]    Those skilled in the art will recognize improvements and modifications to the preferred embodiments of the present disclosure. All such improvements and modifications are considered within the scope of the concepts disclosed herein and the claims that follow.

Summary:
An enclosed drive system for use in conjunction with a lift cord extending from a headrail of an architectural cover. The enclosed system encases and engages the lift cord with a drive mechanism within the enclosure, thereby avoiding hazardous loops. A method for retro-fitting an architectural cover lift cord assembly including a lift cord associated with a cord lock and extending from a headrail of the architectural cover is also described, for modifying the architectural cover to eliminate hazardous loops therefrom. Also disclosed in this disclosure is a cord lock mechanism that pinches the cord, a handle that actuates the cord lock mechanism, and a driving mechanism having a cord guide that engages the cord and a slider that slides along the handle to actuate the cord while the cord is enclosed within an enclosure defined by the handle.