Patent Publication Number: US-9404519-B2

Title: Compensating position roof ditch molding retainer

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present non-provisional United States Patent Application is a divisional of U.S. patent application Ser. No. 12/934,524, having a 371(c) date of Sep. 24, 2010, now U.S. Pat. No. 8,677,572, which is a national phase of International Application Number PCT/US2009/041872 filed Apr. 28, 2009, and claims the benefits of U.S. Provisional Application 61/059,574 filed Jun. 6, 2008, the contents of all of these applications are incorporated herein in their entirety. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates generally to a fastening system adapted to facilitate attachment and retention of a molding strip across a roof ditch depression disposed between a roof panel and a body side panel of a vehicle. The invention is more particularly directed to a fastening system incorporating structures adapted to urge a retained molding strip generally towards a preselected side of the roof ditch depression to maintain proper orientation of the molding strip. The fastening system may incorporate a one-piece or a multi-piece retainer adapted for riveted or other connection at a base of a roof ditch depression. 
     BACKGROUND OF THE INVENTION 
     In the construction of automobiles or other transportation vehicles there is often an elongate depression formed at the interface between the roof panel and the adjacent body side panel. This depression is commonly referred to as a “roof ditch.” These roof ditches are typically covered by placing a molding strip within the depression to at least partially span the distance between the roof panel and the body side panel. The molding strip is held in place by a retainer element which interfaces with the molding and which is secured to the base of the ditch. 
     The roof ditch may have a degree of variation along its length. This variation may be in both depth and in width. The molding strips typically include a flexible edge that conforms to the opposing sidewall of the roof ditch. However, due to the flexible nature of the molding strip edge material, the molding strip may nonetheless shift in the direction transverse to the sidewalls. In an extreme case, a gap may open up between the molding strip and an opposing sidewall of the roof ditch. Accordingly, it would be desirable to provide a molding attachment system that promotes proper placement and retained orientation of the molding strip within the roof ditch. 
     SUMMARY OF THE INVENTION 
     The present invention provides advantages and alternatives over the prior art by providing retainer elements adapted for operative attachment to the base of a roof ditch and which engage an overlying molding strip. The retainer elements selectively urge the molding strip generally towards a preselected side of the roof ditch depression so as to automatically compensate for variations in initial placement and/or roof ditch width. The retainer elements may also compensate for variations in roof ditch depth. The retainer elements may be of multi-piece or single piece construction. 
     According to one aspect, the present invention provides a retainer adapted for disposition within a vehicle roof ditch between a first sidewall and a second sidewall to hold an elongate molding strip in covering relation to the vehicle roof ditch. The retainer includes at least one body portion adapted for disposition within the roof ditch in operative connection to a base portion of the roof ditch. The body portion has a length dimension adapted for orientation along a length segment of the roof ditch between a first sidewall and a second sidewall. The body portion includes an arrangement of molding attachment elements adapted to engage an underside of the elongate molding strip. The body portion further includes at least one spring biasing leg disposed at an elevation below the molding attachment elements, the spring biasing leg extends an operative length away from one side of the body portion for contacting, flexing relation with the first sidewall. The spring biasing leg continuously urges the body portion away from the first sidewall and towards the second sidewall. 
     According to another aspect, the present invention provides a multi-piece retainer adapted for disposition within a vehicle roof ditch between a first sidewall and a second sidewall to hold an elongate molding strip in covering relation to the roof ditch. The retainer includes a base attachment element adapted for operative attachment to a base portion of the roof ditch. The base attachment element includes at least one male attachment member projecting upwardly from the base attachment element in a direction away from the base portion of the roof ditch. The retainer further includes a strip attachment element adapted for operative attachment to an underside of the elongate molding strip. The strip attachment element includes at least one window opening adapted to receive the male attachment member in snap-fit relation. The strip attachment element includes an arrangement of molding attachment elements adapted to engage an underside of the elongate molding strip. The strip attachment element further includes at least one spring biasing leg disposed at an elevation below the molding attachment elements. The spring biasing leg extends an operative length away from one side of the strip attachment element for contacting, flexing relation with the first sidewall. The spring biasing leg continuously urges the strip attachment element away from the first sidewall and towards the second sidewall. The multi-piece retainer also facilitates controlled insertion and removal of the individual pieces without reliance on build variation and burr conditions of a molded strip opening. This may aid in insertion and subsequent servicing. 
     According to still another aspect, the present invention provides a single-piece retainer adapted for disposition within a vehicle roof ditch between a first sidewall and a second sidewall to hold an elongate molding strip in covering relation to the vehicle roof ditch. The retainer includes a body portion disposed within the roof ditch and operatively attached to a base portion of the roof ditch. The body portion is of unitary construction and has a length dimension adapted for orientation along a length segment of the roof ditch between the first sidewall and the second sidewall. The body portion includes an arrangement of molding attachment elements adapted to engage an underside of the elongate molding strip in snap-fit relation. The body portion further includes at least one spring biasing leg disposed at an elevation below the molding attachment elements. The spring biasing leg extends an operative length away from one side of the body portion for contacting, flexing relation with the first sidewall. The spring biasing leg continuously urges the body portion away from the first sidewall and towards the second sidewall. 
     Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings in which like numbers are used to designate like features. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cut-away schematic view of one exemplary embodiment of a molding retainer engaging a molding strip within a roof ditch; 
         FIG. 2  is an exploded assembly view of the molding retainer and molding strip of  FIG. 1 ; 
         FIG. 3  is an elevation perspective view of a male base portion of the molding retainer of  FIG. 1 ; 
         FIG. 4  is an elevation perspective view of a female molding engagement portion of the molding retainer of  FIG. 1 ; 
         FIG. 5  is an elevation perspective view of an exemplary single-piece molding retainer in accordance with the present invention; and 
         FIG. 6  is an elevation plan view of the single-piece molding retainer of  FIG. 5 . 
     
    
    
     Before the embodiments of the intention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use herein of “including”, “comprising” and variations thereof is meant to encompass the items listed thereafter and equivalents thereof, as well as additional items and equivalents thereof. 
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Reference will now be made to the drawings, wherein like elements are designated by like reference numerals in the various views.  FIG. 1  illustrates a roof ditch  10  formed at the intersection of a vehicle roof panel  12  and side panel  14 . In this regard, the roof ditch  10  will typically substantially along the roof line of the vehicle. In the illustrated arrangement, the roof ditch  10  has a depressed cross-sectional profile including an inboard sidewall  16  and an outboard sidewall  18 . The inboard sidewall  16  and the outboard sidewall  18  typically are formed from steel sheet stock or other suitable structural material. The roof ditch  10  also includes a base  20  formed by the overlapping relation of the sheet materials making up the inboard sidewall  16  and the outboard sidewall  18 . 
     In the arrangement illustrated in  FIG. 1 , a molding strip  22  extends substantially along the length of the roof ditch  10 . The width dimension of the molding strip  22  extends between the inboard sidewall  16  and the outboard sidewall  18  so as to substantially cover the underlying interior of the roof ditch  10 . As best illustrated through joint reference to  FIGS. 1 and 2 , the molding strip  22  includes a pliable lateral edge flap  24  extending along one lateral edge and an outwardly projecting lateral rib  26  running along the opposing lateral edge. In use, the lateral edge flap is disposed in deformed conforming relation against one of the sidewalls while the lateral rib  26  is disposed in abutting relation against the opposing sidewall. By way of example only, in the illustrated arrangement, the pliable lateral edge  24  is disposed against the inboard sidewall  16  with the lateral rib  26  abutting against the outboard sidewall  18 . However, this relationship can be reversed if desired. Moreover, the construction of the molding strip may take on any alternative configuration as may be desired and useful. 
     In the illustrated arrangement, the molding strip  22  is secured in place across the roof ditch  10  by a retainer  30  held by a rivet  32  or other attachment mechanism at the base  20 . Referring jointly to  FIGS. 1-4 , in the exemplary construction the retainer  30  is multi-piece construction including a base attachment element  34  adapted to be held at the base  20  of the roof ditch  10  and a strip attachment element  36  adapted for snap-in attachment across the underside of the molding strip  22 . As seen, the base attachment element  34  and the strip attachment element  36  each have a length dimension adapted to extend in aligned relation along a length segment of the roof ditch  10 . The base attachment element  34  and the strip attachment element  36  also have a width dimension adapted to extend at least partially across the width of the roof ditch. In the illustrated construction, the base attachment element  34  and the strip attachment element  36  are adapted to be snapped together during final assembly. The base attachment element  34  and the strip attachment element  36  may be formed of materials such as molded plastic or the like, although other materials of construction may likewise be utilized if desired. 
     Referring now particularly to  FIGS. 1-3 , in the exemplary construction the strip attachment element  36  includes a pair of outwardly extending curved projections  38  defining diverging partial arcs. As shown, the proximal ends of the curved projections are spaced apart from one another at positions along a first lateral edge  40  of the strip attachment element. The curved projections  38  extend away from the first lateral edge along generally opposing paths such that distal ends of the curved projections project generally away from one another towards opposite ends of the strip attachment element to form a so called “bull horn” configuration. 
     In the exemplary construction, a pair of edge projections  42  having downwardly angled upper surfaces extend away from a second lateral edge  44  in generally opposing relation to the first lateral edge  40 . In assembly, the curved projections  38  are placed in position against an interior edge of the molding strip  22 . In this state, the curved projections can be compressed as the opposing edge of the molding strip  22  is pushed in a snap-fit relation over the edge projections  42 . Thereafter, the outward biasing spring action of the curved projections acts to hold the strip attachment element  36  in place relative to the molding strip  22 . 
     In the illustrated arrangement, a downwardly extending hook tab  46  is disposed between the proximal ends of the curved projections  38 . The hook tab  46  may fit into a cooperating engagement slot in the molding strip  22  disposed at a pre-defined position along the length of the molding strip  22  to facilitate proper longitudinal placement of the retainer. In addition to the hook tab  46 , the exemplary strip attachment element  36  also includes an arrangement of anti-rotation tabs  48  are at an elevation below the curved projections  38  and the hook tab  46 . The anti-rotation tabs  48  aid in preventing rotation within the roof ditch following insertion. In the exemplary construction, the strip attachment element  36  also includes an outwardly projecting platform element  50  disposed at a position generally below and between the edge projections  42 . As best seen in  FIG. 1 , the platform element  50  defines a stop surface for the molding strip  22 . The platform element  50  also provides underlying support for the pliable lateral edge flap  24  when the edge flap is folded against the opposing sidewall. 
     As shown, the exemplary construction of the strip attachment element  36  also includes a pair of spring biasing legs  52  extending away from one side. In the arrangement illustrated in  FIG. 1 , the spring biasing legs  52  are in the form of extended leaf springs having upwardly angled distal edges to facilitate upward bending. However, other bendable constructions such as extended rods or the like may be used if desired. As shown, upon insertion into the roof ditch  10 , the spring biasing legs are compressed against an opposing sidewall of the roof ditch  10  at a position below the pliable lateral edge  24  of the molding strip  22 . In this condition, the spring biasing legs  52  urge the molding strip  22  in a direction such that the lateral rib  26  is pressed against the opposing sidewall. This biasing action aids in compensating for variations in the width of the roof ditch. Importantly, it is to be understood that while  FIG. 1  illustrates the spring biasing legs  52  as pushing against the inboard sidewall  16  so as to urge the molding strip  22  towards the side panel  14 , the arrangement may likewise be reversed if desired such that the spring biasing legs  52  push against the outboard sidewall  18  so as to urge the molding strip  22  towards the roof  12 . 
     As noted previously, the two-piece retainer  30  illustrated in  FIG. 1  also includes a base attachment element  34  adapted for placement at the base  20  of the roof ditch  10 . As may be seen through joint reference to  FIGS. 1, 2 and 4 , the base attachment element  34  may be secured in place by a rivet  32  that extends through an acceptance opening  54  in the in the base attachment element  34  and an aligned opening in the base  20 . A portion of the rivet  32  is expanded to form a sealing button  56  below the base  20  in a manner as will be well known to those of skill in the art. In the illustrated arrangement, a seal  58  of rubber or the like may be positioned between the base attachment element  34  and the base  20  to aid in preventing intrusion of noise, dust, water and/or vapors. 
     As shown, the base attachment element  34  includes a pair of inwardly compressible male attachment towers  60 . The attachment towers  60  include a compression gap  62  which permits the attachment towers to compress inwardly slightly towards a central axis when pressure is applied. In the assembly process, the attachment towers  60  are pushed through aligned window openings  64 . The window openings include reduced shelf shoulder portions  66  that compress angled wing portions  68  inwardly towards a central axis during insertion. While only a single angled wing portion is shown on each attachment tower, according to one potentially desirable arrangement, a corresponding wing portion also is disposed across the opposing surface which is not shown. However, it is likewise contemplated that the attachment towers  60  may each include a single angled wing portion if desired. In a construction wherein the attachment towers  60  include single wing portions, the wing portions may project generally towards one another from opposing surfaces of the towers facing generally inwardly towards the acceptance opening  54 . Alternatively, the single wing portions may project generally away from one another from surfaces of the towers facing outwardly away from the acceptance opening  54 . Regardless of the arrangement of the angled wing portions, once the angled wing portions have been pushed past the shoulder portions  66 , the compressive force applied by the shoulder portions  66  is released and the angled wing portions  68  snap back into place behind the upper surface of the shoulder portions. In this condition, the attachment towers  60  are blocked against removal through the window openings  64 . 
     According to one contemplated assembly practice, the base attachment element  34  is placed into the roof ditch  10  in overlying relation to a rivet acceptance opening (not shown) in the base  20 . As shown, the base attachment element  34  may include an arrangement of flexible tabs  70  extending away from opposing lateral sides to aid in avoiding a skewed orientation within the roof ditch. Once the desired position has been achieved, the base attachment element  34  may be secured in place by riveting or other suitable attachment techniques as may be desired. Thereafter, the strip attachment element  36  with the attached molding strip  22  may be pushed downwardly over the aligned attachment towers  60  to assume the condition as shown in  FIG. 1  in which the spring biasing legs  52  continuously urge the strip attachment element  36  and the attached molding strip towards a side of the roof ditch away from the spring biasing legs. 
     While a multi-piece design for the retainer  30  may have a number of benefits, a single piece retainer may likewise be used if desired. By way of example only, an exemplary single piece retainer  130  is illustrated in  FIGS. 5 and 6 . The single piece retainer  130  may be formed from molded plastic or other suitable material and is adapted to reside within a roof ditch (not shown) as previously described in relation to the base attachment element  34  in the two-piece design. Specifically, the single piece retainer  130  includes an acceptance opening  154  adapted to receive a rivet in pass-through relation to an underlying base of the roof ditch. As shown, in the illustrated construction the acceptance opening is of a generally oval shape positioned such that the major axis of the oval is oriented generally transverse to the length dimension of the roof ditch. As will be described further hereinafter, such an oval or other elongate opening facilitates a degree of movement by the retainer  130  across the width of the roof ditch following installation. 
     The illustrated single piece retainer  130  includes an arrangement of angled clip elements  160  having outwardly projecting noses extending away from upper lateral edges. As will be appreciated, a molding strip  22  as previously described in relation to  FIG. 1  may be press-fit over the clip elements  160 . Specifically, as the edges of the molding strip  22  are pressed downwardly against the upper angled surfaces of the clip elements  160 , the clip elements flex downwardly and then spring back into place behind inwardly projecting interior edge surfaces of the molding strip thereby holding the molding strip in place. Stop platforms  162  are disposed longitudinally outboard from the clip elements  160  generally at each corner of the single piece retainer  130 . The stop platforms  162  are positioned at an elevation slightly below the clip elements  160  and act to limit the downward movement of the molding strip. 
     In the illustrated single piece retainer  130 , an elevated positioning post  166  is disposed at a substantially mid-point location along one lateral side. The positioning post  166  is positioned so as to engage a corresponding positioning slot on the molding strip (not shown) to aid in placement of the single piece retainer at a predefined longitudinal position along the molding strip. 
     As shown, spring biasing legs  152  extend away from one lateral side of the single piece retainer  130 . The spring biasing legs  152  are positioned at an elevation generally below the adjacent clip elements  160  and stop platforms  162 . As best seen in  FIG. 6 , the spring biasing legs  152  project outwardly a distance exceeding the length of the adjacent clip elements  160  and stop platforms  162 . Using this arrangement, the spring biasing legs  152  engage an opposing sidewall of the roof ditch and continuously urge the single piece retainer  130  and any attached molding strip towards the far sidewall. As previously noted, the use of an oval, a slot or other elongate geometry rivet acceptance opening  154  facilitates any desired lateral movement of the single piece retainer  130  in response to the urging force provided by the spring biasing legs. Specifically, due to the slightly elongated nature of the rivet acceptance opening  154 , a slight lateral sliding adjustment may take place to provide lateral adjustment. 
     In the arrangement illustrated in  FIGS. 5 and 6 , the spring biasing legs  152  are in the form of extended leaf springs having upwardly angled distal edges to facilitate upward bending. However, other bendable constructions such as extended rods or the like may be used if desired. It is to be understood that the spring biasing legs  152  may be located on either side of the single piece retainer  130 . Likewise, the positioning post  166  may be located on either side of the single piece retainer  130 . Thus, the spring biasing legs  152  and the positioning post  166  may be on the same side or on different sides from one another as may be desired. Moreover, the positioning post  166  may be eliminated entirely if desired. As will be appreciated, the positioning post  166  acts in substantially the same manner as the hook tab  46  previously described in relation to the multi-piece construction so as to position the retainer at a defined position along the length of the molding strip in relation to the roof ditch. 
     In use, the single piece retainer  130  as described may be positioned across a base portion of a roof ditch and held in place by a rivet connection. Thereafter, a molding strip  22  ( FIG. 1 ) may be press-fit over the clip elements  160  and held in place. The spring biasing legs  152  act against an opposing sidewall of the roof ditch and continuously urge the single piece retainer  130  and attached molding strip towards a far sidewall. 
     As will be appreciated, both the multi-piece retainer  30  and the single piece retainer  130  provide a simple mechanism for attachment of a molding strip across a roof ditch. Moreover, such attachment may be carried out by application of a relatively straight pushing force without the need for rolling or sliding action to make the connection. Such straight-line connection by application of a substantially vertical pushing force may simplify the attachment process. 
     Variations and modifications of the foregoing are within the scope of the present invention. It is understood that the invention disclosed and defined herein extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present invention. The embodiments described herein explain the best modes known for practicing the invention and will enable others skilled in the art to utilize the invention. The claims are to be construed to include alternative embodiments to the extent permitted by the prior art. 
     Various features of the invention are set forth in the following claims.