Abstract:
A method for attaching a window lift system to a vehicle is provided, the method including the step of rotationally mounting at least one guide rail to a bracket, wherein the at least one guide rail is capable of rotating in at least one plane within a predetermined range wherein rotation of the at least one guide rail in the predetermined range maintains a cable of the window lift system under tension without a spring loaded conduit such that the cable does not become disengaged from at least one pulley rotatably mounted to the guide rail.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/179,557 filed May 19, 2009 the contents of which are incorporated herein by reference thereto. 
         [0002]    This application also claims the benefit of U.S. Provisional Patent Application Ser. No. 61/179,544 filed May 19, 2009 the contents of which are incorporated herein by reference thereto. 
         [0003]    This application also claims the benefit of U.S. Provisional Patent Application Ser. No. 61/179,535 filed May 19, 2009 the contents of which are incorporated herein by reference thereto. 
         [0004]    This application also claims the benefit of U.S. Provisional Patent Application Ser. No. 61/179,522 filed May 19, 2009 the contents of which are incorporated herein by reference thereto. 
     
    
     BACKGROUND 
       [0005]    Exemplary embodiments of the present invention relate to assemblies for vehicle windows and more particularly to a method for attaching a window lift assembly to a vehicle door. 
         [0006]    Cable drive window lift systems are usually loaded into the door in a flexible state i.e., the rail(s) and cables are held together by the spring loaded conduits of the cable system. This is convenient for door assembly but costly for component cost. The flexible assembly is loaded through a hole in the door inner and attached and datumed to the outboard surface of the door inner. If door brackets are needed, then an additional component is required to be installed over the hole that was needed for the regulator load. The motor and drum housing are typically attached to the door inner with three screws, though in some applications, the motor and drum housing are integrated into one of the guide rails which allows for this fastener count to drop to one. The rail or rails are secured with two fasteners each. Door trim brackets are often added to support the door trim in the armrest or pull cup area. These brackets are attached with an additional two fasteners. Inside handles are attached to the door inner panels with an additional one to two fasteners. 
         [0007]    Accordingly, it is desirable to provide a method of installing a window lift system wherein the system is constructed without additional components such as spring loaded conduits and brackets. 
       SUMMARY OF THE INVENTION 
       [0008]    In accordance with an exemplary embodiment of the present invention, a method for attaching a window lift system to a vehicle is provided, the method including the step of rotationally mounting at least one guide rail to a bracket, wherein the at least one guide rail is capable of rotating in at least one plane within a predetermined range wherein rotation of the at least one guide rail in the predetermined range maintains a cable of the window lift system under tension without a spring loaded conduit such that the cable does not become disengaged from at least one pulley rotatably mounted to the guide rail. 
         [0009]    In accordance with another exemplary embodiment of the invention, a method of securing a dual channel window lift assembly to a vehicle door inner is provided. The method having the steps of: rotationally mounting a door bracket to a pair of guide rails each being configured for rotational movement with respect to the door bracket in a predetermined range; inserting a lower distal end of each of the pair of guide rails into a feature of the door inner wherein the feature limits movement of the lower distal end in 5-ways and the feature has a plurality of walls such that each of the pair of guide rails is not constrained in an upward direction from the feature; inserting an upward distal end of each of the pair of guide rails into another feature of the door inner, wherein the another feature limits movement of the upward distal end in at least 2 of the 5-ways; and securing the door bracket to the door inner. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  illustrates a dual rail window lift system with spring loaded conduits; 
           [0011]      FIG. 2  is an inboard view of the dual rail window lift system of an exemplary embodiment secured to a vehicle door inner; 
           [0012]      FIG. 3  is an outboard view of the dual rail window lift system of an exemplary embodiment secured to a vehicle door inner; 
           [0013]      FIG. 4  is an inboard view of the rail to door bracket securement; 
           [0014]      FIG. 5  is an outboard view of the rail to door bracket securement; 
           [0015]      FIG. 6  is a cross-sectional view along lines  6 - 6  of  FIG. 5 ; and 
           [0016]      FIGS. 7-10  illustrate the upper and lower attachment features of the guide rails and the door inner. 
       
    
    
       [0017]    Although the drawings represent varied embodiments and features of the present invention, the drawings are not necessarily to scale and certain features may be exaggerated in order to illustrate and explain exemplary embodiments the present invention. The exemplification set forth herein illustrates several aspects of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention in any manner. 
       DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0018]    Referring to the attached FIGS. exemplary embodiments of the present invention are illustrated and relate to an apparatus and method for securing a window lift assembly. 
         [0019]    In accordance with an exemplary embodiment of the present invention, the regulator is combined with a door bracket in a manner that allows the window lift system to be loaded and datumed to the door for proper function, but also to be constructed without spring loaded conduits for lower cost. 
         [0020]    In one exemplary embodiment, the window lift assembly is configured to provide limited rotational stability to an interface between the guide rails and the door bracket, with good stability fore/aft, up/down, and inboard/outboard. In one exemplary embodiment, the door bracket provides more functionality than just carrying the regulator, i.e., a door pull cup attachment and inside handle carrier is also provided. One non-limiting example is illustrated in U.S. Provisional Patent Application Ser. No. 61/179,522 filed May 19, 2009 the contents of which are incorporated herein by reference thereto. Reference is also made to U.S. Patent Publication Nos. US20080222962 filed Sep. 18, 2008; and U.S. Patent Publication US20100024306 filed Jul. 31, 2009, the contents each of which are incorporated herein by reference thereto. 
         [0021]    Exemplary embodiments of this invention allow the regulator to be assembled without cables having conduits thereby allow for lower cost cables to be used since the rails are held in position relative to each other by the door bracket. If the rails were not held in position, then the cables would come off of the pulleys. Exemplary embodiments of the present invention hold the rails in place, but also allows the rails to be located to the door once it is assembled therein. If the rails were located (datumed) by the door bracket, the rails could not be held in position to a tight enough tolerance to maintain function throughout the entire range of door build variation. By allowing the rails to be located (datumed) by the door, the traditional tolerancing stack-ups are maintained. 
         [0022]    In an exemplary embodiment of the present invention, the regulator is combined with a door bracket in a manner that allows the regulator system to be loaded and datumed to the door for proper function, but also to be non-conduited for lower cost with only three mechanical fasteners for the entire system—regulator, trim bracket, and inside door handle. 
         [0023]    Accordingly, an exemplary embodiment provides limited rotational stability to the interface between the guide rail and the door bracket, with good stability fore/aft, up/down, and inboard/outboard. In one embodiment, the door bracket provides more functionality than just carrying the regulator, i.e.—door pull cup attachment and inside handle carrier. This invention works because it locates the regulator and the door handle/door pull cup to the door independently, though they are installed at the same time. If the rail was located (datumed) by the door bracket, the rail could not be held in position to a tight enough tolerance to maintain function throughout the entire range of door build variation. By allowing the regulator to be located (datumed) by the door, the traditional tolerancing stack-up is maintained. 
         [0024]      FIG. 1  shows a window lift system  10  with spring loaded conduits while  FIGS. 2-10  illustrate exemplary embodiments of the present invention. 
         [0025]    As shown, a window lift system  12  is provided wherein a pair of guide rails  14  are secured to a door bracket  16 , as discussed above, the mounting of the guide rails to the bracket is configured to provide limited rotational movement and stability to an interface between the guide rails and the door bracket, with good stability fore/aft, up/down, and inboard/outboard. 
         [0026]    Thus, limited movement of the guide rails in the direction of arrows  18  is provided for assisting in the mounting of the lift system as it is inserted into an opening  20  in the door inner  22  so the guide rail or rails can be located or datumed to the door inner such limited movement allows for variances or door inner manufacturing tolerances. 
         [0027]    As illustrated, exemplary embodiments allow the window lift system or window regulator to be assembled with cables  24  that do not have conduits thereby allowing for lower cost cables to be used since the rails are held in position relative to each other by the door bracket. If the rails were not held in position, then the cables would come off of the pulleys  26  secured to the guide rails. As illustrated, a motor  25  for driving a motor drum within a motor drum housing  27  is provided. The motor drum is secured to the cables and the cables are secured to a carrier  31  which moves up and down as the motor is activated to effect movement of a window (not shown). In one non-limiting embodiment, the motor is secured to the bracket and in another non-limiting embodiment the motor may be secured to the guide rail. Of course, the motor may be secured in still other locations. 
         [0028]    Exemplary embodiments of the present invention hold the rails in place, but also allows the rails to be located to the door once it is assembled therein (e.g., movement in the direction of arrows  18 ). If the rails were located (datumed) by the door bracket, the rails could not be held in position to a tight enough tolerance to maintain function throughout the entire range of door build variation. By allowing the rails to be located (datumed) by the door, the traditional tolerancing stack-ups are maintained. 
         [0029]    One non-limiting attachment of the rail to the door inner is shown at least in  FIGS. 2-5  wherein the bottom of the rail is received in a cup or feature  50  that defines an opening  51  for receipt of a distal end  53  of the guide rail therein. The cup or feature has a plurality of walls that define opening  51  and provide 5-way locational control of the distal end of the rail therein (e.g., left to right or fore to aft; inboard and outboard and downward such that only the up direction (arrow  49 ) is not constrained by the cup or feature  50 . At the opposite end or a top distal end  55  of the rail is held in a pocket or feature  52  of the door inner for 2-way control (for/aft or right to left) while allowing the distal end to be inserted into the pocket in an outboard direction until the distal end contacts a portion of the pocket or feature and the bracket is secured to the door inner. As illustrated in  FIG. 8  the top distal end of the guide rail may have an arm member that extends away from the guide rail for receipt in feature  52  while other portions of the top of the guide rail are configured to rotationally receive a pulley therein. Of course, other alternative insertion methods into features  52  of different configurations may be used for example moving the distal end in an inboard direction until the feature is contacted and then securing the bracket. 
         [0030]    The door bracket  16  secures the center of the rail in the inboard/outboard directions and holds the rail against upward movement in the direction of arrow  49  once the bracket is secured to the door inner, thus the system is secured in a manner that allows for several degrees of freedom, which in turn allows for numerous door build variations to be accommodated. 
         [0031]    As shown in  FIGS. 4-6  one non-limiting configuration for securing the guide rails to the bracket is illustrated. Here a feature  30  of the bracket engages an opening  32  in each guide rail. 
         [0032]    In addition, the guide rails each further comprises a resilient arm member  34  for engaging an upper curved surface  37  of the bracket after the feature engages the opening in the guide rail and the guide rail has a lower feature  38  for engaging a lower curved surface  40  of the bracket after the feature engages the opening in the guide rail such that the movement of the guide rail in the direction of arrows  18  with respect to the door bracket is allowed in a limited range while movements in other directions is prevented. Again, this movement is provided to allow for installation of the system to a door inner as it is inserted through an opening and the guide rails are located by features  50  and  52  of the door inner wherein the movement allows for door inner tolerances. Thereafter, the bracket is secured to the door. 
         [0033]    Accordingly and in one embodiment, the system may be secured to the door inner as follows; first the lower distal end of the guide rail or rails is/are inserted into the openings of feature(s)  50  and then the upper distal ends of the guide rail or rails is/are received in feature(s)  52  thus, the guide rail or rails is/are located or datumed by the door inner and then the bracket is secured to the door inner. 
         [0034]    In one alternative embodiment the range of movement of the guide rails with respect to the door bracket in the direction of arrows  18  may be defined by a stop feature or engagement of a portion of feature  36  on bracket  16  such that limited ranges are defined by arrows  44 . Of course, these ranges are merely provided as examples and exemplary embodiments of the present invention are not intended to be specifically limited to the ranges shown herein. 
         [0035]    In one non-limiting exemplary embodiment, a portion  46  of feature  34  comprises an angled surface for engaging a portion of upper curved surface  37 . 
         [0036]    Door bracket  16  further comprises a plurality of mount openings  48  for securement of the bracket and ultimately the entire window lift system to the vehicle door inner. In one non-limiting exemplary embodiment, the mount openings are positioned in one of a pair of structural arm members  50  each of which extends from portions of the door bracket that define the door pull cup attachment or inside handle carrier. In addition and in one embodiment, the structural arm members are integrally molded with the bracket. Still further and in another embodiment, a vehicle door handle  70  is mounted to one of the structural arm members. 
         [0037]    As illustrated and in one embodiment, the mount openings  48  are located proximate to distal ends of the structural arm members. In addition and as illustrated in at least  FIGS. 2 and 3  and in one non-limiting embodiment, the bracket is mounted to a peripheral portion of an opening  20  of the vehicle door inner  22 . In one implementation, the vehicle door inner is configured to have tab members or ears  54  extending into the opening  22  in order to provide a securement surface for the distal ends of the structural arm members. 
         [0038]    Also illustrated in the FIGS. is that the window lift system is secured to the bracket and the bracket provides a simple and efficient means for securing the window lift system to the vehicle door inner. 
         [0039]    The attachments of the rails in one exemplary embodiment is described and illustrated as follows. The bottom of the rails are held in cups or features  50  for 5-way locational control and only the up direction is not constrained. The top of the rails are held in pockets  52  for 2-way control (for/aft). The door bracket  16  secures the center of the rail inboard/outboard and holds the rails against up movement, thus the system is secured in a degrees of freedom. 
         [0040]    Although a dual rail system is illustrated exemplary embodiments of the present invention are also contemplated to be used with single rail systems. 
         [0041]    In one non-limiting exemplary embodiment and where applicable, the components of the window lift system or assembly as well as the vehicle door inner are manufactured from an easily molded or formed such as plastic or equivalents thereof In some instances all of the components are molded from plastic while in other embodiments only portions are molded from plastic. 
         [0042]    As used herein, the terms “first,” “second,” and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, and the terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. In addition, it is noted that the terms “bottom” and “top” are used herein, unless otherwise noted, merely for convenience of description, and are not limited to any one position or spatial orientation. 
         [0043]    While the invention has been described with reference to an exemplary embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.