Abstract:
A connector for holding an internal muntin assembly away from a perimeter spacer of an insulating glass assembly until the assembler is ready to affix the muntin bar to the perimeter bar using an attachment device. The connector includes a positioning tab for holding the muntin bar away from the perimeter spacer to allow positioning of the muntin bar assembly until the positioning tab is moved relative to a baseplate so that the attachment device, such as thick double stick tape, is pressed to the perimeter spacer.

Description:
TECHNICAL FIELD 
   The present invention relates to the field of windows and more specifically to the field of grills for windows. 
   BACKGROUND OF THE INVENTION 
   It has become a design trend for windows to include a grill to enhance the aesthetic look of the window. For example, U.S. Pat. No. 3,686,814 (Anderson) shows false muntin bars  20  and  22  positioned on a window. 
   Many different methods of attaching the grills to the window frame were developed. In U.S. Pat. No. 5,657,590 (Digman et al.), an end connector was shown (see  FIGS. 3 and 4 ) for connecting a muntin bar to a window frame (see  FIG. 1 ). The end connector included a spine, a stabilizing end, fins, a platform  38  and pins. The stabilizing end was inserted into open ends of the muntin bar and engaged with the holes to hold the bar in place. End connectors in U.S. Pat. No. 5,678,376 (Poma) and U.S. Pat. No. 6,425,221 (Reichert) operated in a similar manner. 
   A problem with the prior art approach was that it required the drilling of many holes in the window frame or glass frame. This involved much labor and could lead to broken seals in insulated glass packs. 
   SUMMARY OF THE INVENTION 
   The present invention is a new muntin bar connector with a positioning device and an adhesive. In one embodiment, the connector includes a baseplate, a muntin bar tab, an adhesive on the baseplate and a positioning tab connected to the baseplate. The muntin bar tab is connected to a muntin bar to be positioned relative to a window. The positioning tab is positioned such that the adhesive is held away from a frame of the window until the spring tab is depressed. The positioning tab may be formed as an extension to the baseplate, or through formation or fixation of a resilient structure to a bottom side of the baseplate. 
   In another embodiment, the connector includes a baseplate, a muntin bar tab, an adhesive on the baseplate and first and second positioning tabs connected to the baseplate. Resilient fingers are positioned along the muntin bar tab to further engage the muntin bar As a further enhancement to this embodiment, lock tabs that engage with tabs on the resilient fingers, may be included on the positioning tabs to hold the positioning tabs in a particular position after the muntin bar assembly is installed in a window. As a further enhancement, tabs may be placed on the bottom surface of the baseplate to hold the adhesive in position during positioning of the muntin bar and connector adjacent to the frame. 
   In yet another embodiment, a connector includes a baseplate, a muntin bar tab, an adhesive and posts extending from or through the baseplate. The adhesive can be placed between the posts. The posts may include braces to connect the posts to the baseplate and to provide a hinge point for the posts. 
   In still another embodiment, a connector includes a baseplate, a muntin bar tab formed on the baseplate as a collar for holding the muntin bar therein and an adhesive. The connector may include one or more positioning tabs. 
   In operation, the connector may be associated with a muntin bar and then positioned adjacent to a frame used to separate panes of glass in a multiple glazing glass unit. The positioning tabs serve to prevent the adhesive from adhering to the frame until the installer is ready to finally position the muntin bar. By causing relative movement between the baseplate and the positioning tabs, through as an example pressure on the muntin bar toward the frame, the adhesive is placed in contact with the frame and the muntin bar connector becomes affixed to the frame. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a right front perspective view of a first connector of the present invention.  FIG. 1A  is a perspective view of the connector of  FIG. 1  with a reinforcing rib. 
       FIG. 2  is a front plan view of the connector of  FIG. 1 . 
       FIG. 3  is a top view of the connector of  FIG. 1 . 
       FIG. 4  is a right side plan view of the connector of  FIG. 1 .  FIG. 4A  is an exploded view of a connector for insertion into a muntin bar and a window channel into which the connector is installed. 
       FIG. 5  is a left front perspective view of a second connector of the present invention. 
       FIG. 6  is a front plan view of the connector of  FIG. 5 . 
       FIG. 7  is a front elevation view of another embodiment of the connector.  FIG. 7A  is a top view of the connector of  FIG. 7 .  FIG. 7B  is a bottom view of the connector of  FIG. 7 .  FIG. 7C  is a left front perspective view of the connector of  FIG. 7 .  FIG. 7D  is a left front perspective view of the connector of  FIG. 7 , installed in a muntin bar. 
       FIG. 8  is a front plan view of another embodiment of the connector. 
       FIG. 9  is a front plan view of yet another embodiment of the connector. 
       FIG. 10  is a front plan view of still another embodiment of the connector. 
       FIG. 11  is a rear perspective view of another embodiment of the connector.  FIG. 11A  is a plan view of a locking tab and bump of the connector of  FIG. 11 . 
       FIG. 12  front elevation view of yet another embodiment of the connector.  FIG. 12A  is a right elevation view of the connector of  FIG. 12 .  FIG. 12B  is a top view of the connector of  FIG. 12 . 
       FIG. 13  is a front perspective view of still another embodiment of the connector of the present invention.  FIG. 13A  is a front elevation view of the connector of  FIG. 13 .  FIG. 13B  is a top view of the connector of  FIG. 13 .  FIG. 13C  is a right side view of the connector of  FIG. 13 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring now to  FIGS. 1 and 2 , thereshown is a connector  10  of the present invention. Connector  10  includes baseplate  12  and muntin bar tab  15 . In use, the muntin bar tab is connected to a muntin bar (see  FIG. 7D  for an example) and the baseplate is mounted on a window frame. 
   The muntin bar tab in this embodiment is generally a rectangular prism extending from the baseplate. It is advisable to make the size and shape of the baseplate at least generally match the shape of the cavity into which it will be inserted and preferably make the surface area large enough to cover the entire opening. The baseplate includes first and second positioning tabs  13  and  14 . The positioning tabs can be formed by forming narrowed regions  301  and  302 , of the baseplate. A resilient effect is generated when positioning tab  13  is moved in the direction of arrow  305 . Region  303  is compressed in such a movement and provides the spring force to return the tab to a downward orientation. Region  304  works in a similar way when positioning tab  14  is moved in the direction of arrow  306 . 
   Resilient fingers  16  are formed on muntin bar tab  15  to ensure proper placement of the tab within the muntin bar. The tips of the resilient finger can engage with the internal surface of the muntin bar to provide a holding force to keep the connector in place within the muntin bar. 
   An additional resilient finger  17  can be provided on each side, just above the positioning tabs. The positioning tabs may include locking tabs  20  while the resilient fingers  17  can include lock  18 . Locks  18  extend toward locking tabs  20 , and include a sloped portion along which projection  21  of locking tab  20  may ride when the locking tabs are moved in the directions indicated by arrows  305  and  306 , until surface A of the locking tabs are resting on surface B of the locks. At this point, the positioning tabs are restrained and the baseplate and the first and second positioning tabs form a substantially planar surface. 
   In  FIG. 1A , an alternate embodiment of the connector is shown that includes reinforcing ribs  40  at the base of the muntin bar tab. The reinforcing ribs limit the amount of relative motion that can occur between the baseplate and the tab. 
   In  FIG. 2 , an adhesive  30  is shown. Before the positioning tabs are locked in place, the adhesive is shielded from a surface to which it will be attached by ends  35  of the positioning tabs making contact with the attachment surface. As described above, the positioning tabs, when moved in the direction of arrows  305  and  306  will lock in place and form a generally planar surface on the bottom side of the baseplate and the adhesive can then contact the attachment surface. The adhesive used is a matter of design choice subject to design constraints of, for example, the materials used in forming the connector and the attachment surface, temperature range and humidity. One adhesive that is particularly useful is double stick foam tape available from 3M Company. 
   In  FIG. 3 , a top view of the connector of  FIG. 1  is shown. 
     FIG. 4  is a right side plan view of the connector of  FIG. 1 . Note that the left side view would be substantial the same except that slope S would be located on the right side of the Figure instead of the left. 
   The connector may be formed by injection molding using, for example, a material such as NORYL™ thermoplastic resin from General Electric. Preferred materials for forming the connector have a high modulus of elasticity (good spring rate), non-absorbency, does not out gas or get brittle in a hot dry environment such as is found inside of insulating glass units. 
   Referring now to  FIG. 4A , thereshown is a connector  10  in relationship with a muntin bar  100  and a window channel  105 . Window channel  105  may be generally a u-shaped channel (although virtually any shape may be used such as a combination of the shapes shown in  FIG. 4A  or a box shape) to be positioned between two panes of glass (not shown). One pane of glass would be positioned adjacent to side  107  and held in place by an adhesive/sealant such as polyisobutyral. The muntin bar grid is then put into position. Positioning tabs  13  and  14  hold the bottom of baseplate  12  away from the inside base surface  106  of the window channel  105  until an installer is ready to position the muntin bar. Adhesive  30 , which is normally carried on the bottom of the baseplate, is consequently held away from the inside base surface  106  and attachment therefore does not occur until the positioning tabs  13  and  14  are depressed by the installer. In operation, the connector may be associated with a muntin bar and then positioned adjacent to a frame used to separate panes of glass in a multiple glazing glass unit. The positioning tabs serve to prevent the adhesive from adhering to the frame until the installer is ready to finally position the muntin bar. By causing relative movement between the baseplate and the positioning tabs, through as an example pressure on the muntin bar toward the frame, the adhesive is placed in contact with the frame and the muntin bar connector becomes affixed to the frame. Another pane of glass is then positioned on the other outside surface of the channel (not shown). 
   Referring now to  FIG. 5 , thereshown is another embodiment of the present invention. While this embodiment is substantially similar to the embodiment of  FIG. 1 , tabs  401  have been added. The tabs  401  help position the double stick tape or adhesive material at the attachment site.  FIG. 6  shows a front plan view of the connector of  FIG. 5 . As can be seen, the thickness of adhesive  30  is preferably greater than the extent of downward projection of the tabs  401 . 
   Referring now to FIGS.  7  and  7 A–C, thereshown are a front elevation view, a top view, a bottom view and a left front perspective view of another embodiment of a connector. This connector includes a baseplate  12 , positioning tabs  13  and  14 , tab  15  and resilient fingers. This embodiment differs from the earlier embodiments in that it includes base tabs  45  to compress the muntin bar when installed. The base tabs are positioned so that the muntin bar is positioned between the tab  15  and the base tabs  45 . This can be seen in  FIG. 7D . Muntin bar  100  maybe made, for example, from rolled aluminum and is formed so as to fit between sheets of glass. The resilient fingers  16  make contact with the interior side walls  108  of the muntin bar  100  to hold the connector in place. 
   Referring now to  FIG. 8 , another embodiment of the inventive connector is shown. Here, only one spring tab  13  is used and only one region  301  is formed. The adhesive  30  extends between the spring portion  13  and the baseplate  12 . Only one resilient finger with a lock  17  is used to engage locking tab  20 . Resilient fingers  16  may be used to provide a more secure positioning of the connector within the muntin bar. Again, movement of the positioning tab in the direction of arrow  801  causes the adhesive to become unshielded by contact points  35  and to make contact with a window frame (not shown). 
   Referring now to  FIG. 9 , thereshown is yet another embodiment of a connector  10 . Here, the muntin bar tab  15  has been extended to the full width of the muntin bar into which it will be inserted. In other respects is may be the same as the connector of  FIG. 1 , or incorporate the single positioning tab feature of the connector of  FIG. 8 . 
   Referring now to  FIG. 10 , thereshown is still another embodiment of the presently inventive connector. Here, positioning tabs  109  may be formed out of baseplate  10  by, for example, cutting and stretching a portion of the baseplate to form leaf springs. 
   Referring now to  FIG. 11 , thereshown is a rear perspective view of yet another embodiment of the connector  10 . In this embodiment, bumps  60  have been added to the bottom side of the positioning tabs  13  and  14 . The bumps provide the benefit of assisting in positioning of the adhesive and to assist in the locking of the locking tabs. In  FIG. 11A , an expanded view of a bump  60  is shown. While no particular shape is required, it in one embodiment, the bump extends from the bottom side of the positioning tab  13  by approximately 50 percent of the width of the positioning tab itself. 
   FIGS.  12  and  12 A– 12 B illustrate the connector  10  having a muntin bar tab  15  with resilient fingers  16  and adhesive  30 . The positioning tabs  70 ,  71  are attached to the base plate  12  at the locations  72 . The positioning tabs  70 ,  71  hold the bottom of base plate  12  away from the inside base surface of the window channel until an installer is ready to position the muntin bar. 
   Referring now to FIGS.  13  and  13 A–C thereshown is yet another embodiment of the connector  10  of the present invention. This version of the connector would be primarily for use with solid (not hollow) muntin bars, although it could be used with hollow muntin bars as well. Here, tab  15  is formed as a collar with a central opening  80  for receiving the muntin bar therein. In one embodiment, the perimeter of the central opening  80  matches the outer shape of the muntin bar. All patents and patent applications disclosed herein, including those disclosed in the background of the invention, are hereby incorporated by reference. Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. In addition, the invention is not to be taken as limited to all of the details thereof as modifications and variations thereof may be made without departing from the spirit or scope of the invention.