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CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This Application claims the benefits of U.S. Provisional Patent Application No. 60/679,344, filed May 9, 2005, the entire contents of which are expressly incorporated herein. 
     
    
     STATEMENT RE: FEDERALLY SPONSORED RESEARCH/DEVELOPMENT 
       [0002]    Not Applicable 
       BACKGROUND 
       [0003]    The present invention relates to a method of installing a corner bead to a doorway, and also to an apparatus for installing the corner bead to the doorway. 
         [0004]    Conventionally, a drywall corner bead is installed on a doorway by manually sawing a slot in a latch side jamb and a hinge side jamb of a doorframe for receiving the drywall corner bead. As will be further explained below, such conventional method of installing the drywall corner bead is unsatisfactory. 
         [0005]    A door is installed in a wall by framing an opening in the wall such that the opening is sized and configured to fit a doorframe. The doorframe may be comprised of a latch side jamb, a hinge side jamb and a top jamb connected to upper distal ends of the latch and hinge side jambs. Before the doorframe is disposed within the opening of the wall, a slot may be manually sawed into edges of the jamb, as shown in  FIG. 1 . After the slot is sawed into the jambs, the doorway is disposed within the opening of the wall. Shims may be disposed between the doorframe and an adjacent trimmer stud. The shims are adjusted until the doorframe is squared. Thereafter, the shims are nailed to the jambs and the trimmer studs. At this point, the jamb may fail due to the thin or reduced thickness of the jamb. In particular, when the slots were sawed into the edges of the jamb, it created stress concentrations or weak points at a base of the slot. As such when the nail is hammered into the doorframe, the weak point of the base of the slot may be fractured thereby damaging the doorframe. Also, the prior ail method of attaching the corner bead to the doorway increases cost to manufacture or install the corner bead because the slot must be manually sawed in the factory or at the construction site. Another deficiency of the conventional method of installing the corner bead to the doorway is that an exposed edge of the jamb is reduced because the slot must be sawed at about a middle portion of the jamb edge, which increases the cost of radius millwork. 
         [0006]    To mitigate against the reduction of the exposed edge of the jamb, prior art methods of installing the corner bead may include utilizing a jamb having a wider exposed edge such that when the slot is sawed into the jamb, the exposed edge of the jamb is approximately the same as typical jambs. Unfortunately, jambs having a wider exposed edge cost more due to the additional material and further requires special oversized framing. 
         [0007]    Accordingly, there is a need in the art for an improved method for installing a corner bead to a doorway and also for an apparatus for installing the corner bead to the doorway. 
       BRIEF SUMMARY 
       [0008]    The present invention addresses the needs discussed above, below and those that are known in the art. While various applications of embodiments of the present invention are discussed herein as being utilized on a doorframe, it is also contemplated that embodiments of the present invention may be used with any millwork that may accept a drywall corner bead, including doorframes, windows, and/or other finished flat and radius millwork. Therefore, it shall be understood that use of terms referring to doors or doorframes, such as the term “doorframe,” as well as the teachings herein, may be applied for other millwork, such as windows. Thus, embodiments of the present invention may be applied to other forms of millwork that accept a drywall corner bead, and should not be considered to be limited to doorframe applications. 
         [0009]    According to an embodiment of the present invention, a jamb strip is attached to the doorframe which collectively forms a receiving channel to receive the drywall corner bead to make installation of the corner bead less costly on radius millwork and maintain the structural integrity of the doorframe. In particular, the doorframe may comprise a latch side jamb and a hinge side jamb and a top jamb. These jambs define lateral side surfaces and an upper surface. The jamb strip may be secured to the lateral side surfaces and the upper surface by stapling an attachment base of the jamb strip to such surfaces. A flange of the jamb strip may also be directed to the exterior of the wall. The flange of the jamb strip may define a receiving surface which may be offset from an interface surface of the attachment base. Accordingly, when the jamb strip is secured to the jamb, the receiving surface does not contact the lateral side surfaces of the latch and hinge side jambs and the upper surface of the top iamb. The receiving surface of the jamb strip flange and the lateral side surface/top surface of the jamb defines a receiving channel which receives the corner bead. 
         [0010]    After the jamb strip is secured to the doorframe the doorframe is disposed within an opening of the wall and squared via shims. The shims are secured to the doorframe and the wall via a nail, and the shims are cut off flush to the doorframe. The corner bead is then attached to a drywall of the wall and inserted into the receiving channel. 
         [0011]    The corner bead may comprise a corner portion a first flange and a second flange. The first flange may have a plurality of apertures for receiving a shaft of a nail. The first flange of the corner bead is laid adjacent to the drywall, and simultaneously, the second flange may be inserted into the receiving channel. Nails are inserted into the apertures of the first flange to secure the corner bead to the drywall. Correspondingly, the receiving channel secures the second flange of the corner bead to the door frame. The exterior surfaces of the doorframe, corner bead and the drywall are then painted to make the doorway aesthetically beautiful. 
         [0012]    In a first embodiment of the jamb strip the attachment base may define an upper surface having a convex configuration. The junction between the flange and the attachment base may have an abrupt change in direction which may serve as a guide for a staple gun or a nail gun. More particularly, when the installer secures the jamb strip to the doorframe, the installer may bump a staple gun against the guide to align the staple of the staple gun to a fulcrum of the upper surface. In this manner, the installer does not have to manually align the staple to the attachment base. Also, since the staple is aligned to the fulcrum of the upper surface, it is less likely that the staple will penetrate through the attachment base and into the doorframe. The installer may quickly staple the attachment base to the doorframe by bumping the staple gun against the guide along a plurality of points of the attachment base. 
         [0013]    In an aspect of the iamb strip, the jamb strip may have a cam surface and a lip formed on a flange of the jamb strip The cam surface, lip and receiving surface of the flange of the jamb strip along with the lateral side surface of the jamb forms a receiving channel for receiving a second flange of the corner bead. Also, the second flange of the corner bead may be formed with a pawl for engaging the lip for holding the corner bead to the jamb. 
         [0014]    In another aspect of the jamb strip, the same may be reversible such that a first width of a receiving channel may be formed between a receiving surface of a first portion of the jamb strip and the lateral side surface of the jamb when the jamb strip is attached to the jamb in a first orientation (i.e., second portion attached to the jamb). Also, the jamb strip may form a second width of a receiving channel defined by a receiving surface of a second portion of the jamb strip and the lateral side surface of the jamb when the jamb strip is attached to the jamb in a second orientation (i.e., first portion attached to the jamb). Moreover, the first width may be narrower compared to the second width of the receiving channels for receiving corner beads having different second flange thicknesses. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which: 
           [0016]      FIG. 1  is an illustration of a prior art method of installing a drywall corner bead to a doorway; 
           [0017]      FIG. 2  is a perspective view of a doorway; 
           [0018]      FIG. 3  is an exploded cross-sectional view of the doorframe and wall illustrating a corner bead installable to the doorway via a jamb strip; 
           [0019]      FIG. 4  is a perspective view of a corner bead defining a first flange and second flange with a corner portion interposed therebetween; 
           [0020]      FIG. 5  is a first embodiment of the jamb strip; 
           [0021]      FIG. 6  is a second embodiment of the jamb strip; 
           [0022]      FIG. 7  is a third embodiment of the jamb strip; 
           [0023]      FIG. 8  is a cross-sectional view of a doorframe incorporating a fourth embodiment of the jamb strip; 
           [0024]      FIG. 8A  is a partial exploded view of  FIG. 8 ; 
           [0025]      FIG. 9A  is a fifth embodiment of the jamb strip; 
           [0026]      FIG. 9B  is an illustration of the fifth embodiment of the jamb strip attached to the doorframe in a first orientation; 
           [0027]      FIG. 9C  is an illustration of the fifth embodiment of the jamb strip attached to the doorframe in a second reversed orientation; 
           [0028]      FIG. 10  is a partial view of an arched doorframe with the jamb strip secured to an upper surface of a top jamb; 
           [0029]      FIG. 10A  is a top view of the doorframe and jamb strip of  FIG. 10 ; 
           [0030]      FIG. 10B  is a side view of the doorframe and jamb strip of  FIG. 10 ; and 
           [0031]      FIG. 11  is a flow chart of a method of installing the corner bead to the doorway with the jamb strip. 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    Referring now to the drawings which are for the purpose of illustrating the preferred embodiments of the present invention and not for the purpose of limiting the same,  FIG. 2  is a perspective view of a doorway  10 . Although the various aspects of the present invention are described in relation to a doorway  10 , the various aspects of the present invention may be variously embodied and employed in different situations. By way of example and not limitation, the various aspects of the present invention may be employed in windows, skylights, and the like. In particular, embodiments of the present invention may be used with any millwork that may accept a drywall corner bead  26 , including doorframes, windows, and/or other finished flat and radius millwork. Therefore, it shall be understood that use of terms referring to doors or doorframes, such as the term “doorframe,” as well as the teachings herein, may be applied for other millwork, such as windows. Thus, embodiments of the present invention may be applied to other forms of millwork that accept the drywall corner bead  26 , and should not be considered to be limited to doorframe applications. 
         [0033]    The doorway  10  man comprise a wall  12  defining an opening. A doorframe  14  may be disposed within the opening and squared. Thereafter, a door  16  may be hung on the doorframe  14  which may be rotatable about hinges  18  and locked to the doorframe  14  via a latch  20 . 
         [0034]    To make the doorway  10  more aesthetically beautiful, the wall  12  which may comprise a plurality of vertical and horizontal studs  22  may be overlaid or covered with drywall  24  and subsequently painted. Moreover, the drywall corner bead  26  may be attached to the wall  12  and the doorframe  14  which may hide (see  FIG. 3 ) the shims  28 , studs  22  and other raw construction materials (e.g., nails, staples. etc.) to make the doorway  10  more aesthetically beautiful. 
         [0035]    As shown in  FIG. 3 , the corner bead  26  may be disposed adjacent to the drywall  24  and the doorframe  14 . More particularly, the corner bead  26  may define a first flange  30  and a second flange  32  with a bead or corner portion  34  interposed therebetween (see  FIG. 4 ). The bead or corner portion  34  shown in  FIG. 3  has a rounded configuration, but it is also contemplated that the bead or corner portion  34  may have other configurations such as square (i.e., 90°), oblique, shaped and the like. The first flange  30  may be disposed against the drywall  24  (see  FIG. 3 ). The first flange  30  may have a plurality of apertures  36  (see  FIG. 4 ) for receiving a nail  38  so as to secure the first flange  30  and the corner bead  26  to the drywall  24 . Nails  38  may proceed through the apertures  36  of the first flange  30  and into the drywall  24  and the stud underlying the drywall  24 . In this maimer, the corner bead  26  may be securely fixed to the building structure. The second flange  32  of the corner bead  26  may be received into a receiving channel  40  formed by a jamb strip  42  and the doorframe  14 . As shown in  FIG. 3 , both sides of the wall  12  and doorframe  14  may be connected to each other via the corner bead  26 . Although the structure shown in  FIG. 3  is of a latch side jamb  44  of the doorframe  14 , it is also contemplated that the corner bead  26  may be attached to the hinge side jamb  46 , the top jamb  48  and/or a threshold  50 . After the corner bead  26  is attached to the doorway  10 , the exterior surfaces of the doorframe  14 , corner bead  26  and drywall  24  may be painted to make the doorway  10  more aesthetically pleasing to visitors, guests and owners of the building structure. 
         [0036]    The jamb strip  42  may be attached to the doorframe  10  in the following manner. Initially, the doorframe  10  is not attached to or disposed in the opening of the wall  12 . With the doorframe  14  not attached to the wall  12 , the jamb strip  42  may be attached to lateral side surfaces  52  of the latch side jamb  44  and/or hinge side jamb  46 , and/or the top surface  54  of the top jamb  48  (see  FIG. 10 ). The jamb strip  42  may be a flexible strip such that it may bend and flex in its lengthwise direction. The flex permits the jamb strip  42  to hug the lateral side surfaces  52  of the side jambs  44 .  46  when the jamb strip  42  is attached to the jamb  44 ,  46 ,  48  despite the shape of the lateral side surface  52  or top surface  54  of the jamb  44 .  46 ,  48 . By way of example and not limitation, if the top jamb  48  was arched, then the jamb strip  42  may conform to the curved arch configuration of the top jamb  48  (see  FIG. 10 ). When the jamb strip  42  is disposed on the lateral side surface  52  or top surface  54  of the jamb  44 ,  46 ,  48 , a flange  72  of the jamb strip  42  may be directed toward an exterior surface of the wall  12 . A distal edge  56  (see  FIG. 3 ) of the jamb strip  42  may be aligned with an exposed edge  58  of the jamb  44 ,  46 ,  48 . The jamb strip  42  may be permanently attached to the jamb  44 ,  46 ,  48  via a staple  59  or nail  38 . For example, the installer may staple an attachment base  60  of the jamb strip  42  to the jamb  44 ,  46 ,  48 . Since the jamb strip  42  is attached to the door frame  14  as a long strip, the installer may staple the attachment base  60  at a plurality of points so as to securely attach the jamb strip  42  to the doorframe  14 . In particular, the installer may bump a staple gun or nail gun against a guide  62  to align the staple or nail  38  to the attachment base  60 . 
         [0037]    Optionally, the jamb strip  42  may be interrupted such that the jamb strip  42  does not extend the entire length of the top jamb  48 , the latch side jamb  44  or hinge side jamb  46 . Rather, the jamb strip  42  may be interrupted to provide space such that shims  28  may be interposed between the doorframe  14  and the wall  12  to square the doorframe  14 . 
         [0038]    After the jamb strip  42  is attached to the doorframe  14 , the installer disposes the doorframe  14  in the opening of the wall  12 . The installer then inserts shims  28  between the doorframe  14  and the wall  12  to square the doorframe  14 . In particular, the opening of the wall  12  may be defined by a header  64 , king studs  66 , a latch side trimmer stud  68  and a hinge side trimmer stud  70 . With the doorframe  14  disposed within the opening of the wall  12 , the installer may place a leveler against the latch side jamb  44  or the hinge side jamb  46 . The installer inserts shims  28  between the latch side jamb  44  and the latch side trimmer stud  68 , the hinge side jamb  46  and the hinge side trimmer stud  70 , and the top jamb  48  and the header  64 . The shims  28  are adjusted until the latch side jamb  44  or hinge side jamb  46  is level and the doorframe  14  is squared. A nail  38  is inserted through the doorframe  14 , shims  28  and the trimmer stud  68 ,  70  to secure the shims  28  between the doorframe  14  and the trimmer stud  68 ,  70 . After the shims  28  are secured via the nail  38 , the protruding portions of the shims  28  are sawed off flush with the exposed edge of the doorframe  14 . 
         [0039]    The corner bead  26  which may comprise a first flange  30  and a second flange  32  interposed by a corner portion  34  (see  FIG. 4 ) may be disposed about the outer periphery of the door  16 . In particular, a first flange  30  may be disposed adjacent the drywall  24 . The first flange  30  may have a plurality of apertures  36  through which a nail  38  may be inserted to secure the corner bead  26  to the wall  12  structure. In particular, as shown in  FIG. 3 , after the first flange  30  is disposed adjacent the drywall  24 , a nail  38  may be inserted into the aperture  36  to secure the corner bead  26  to the wall structure. The second flange  32  may simultaneously be inserted into a receiving channel  40  formed by the jamb strip  42  and the latch side jamb  44 . Thereafter, the doorframe  14 , corner bead  26  and the drywall  24  may be painted to make the same more aesthetically pleasing. 
         [0040]    The jamb strip  42  may be provided as a roll or as a long strip. The longitudinal length of the jamb strip  42  may be flexible such that the jamb strip  42  may conform to variously configured doorways  10  such as arched doorways. Additionally, the flexibility of the jamb strip  42  allows the jamb strip  42  to conform not only to a curvature of the doorway  10 , but also may allow the jamb strip  42  to conform to a curvature of a window or a curvature of given millwork. 
         [0041]      FIGS. 5-9C  illustrate variously configured jamb strips  42 . Although five embodiments of the jamb strip  42  are shown in  FIGS. 5-9C , it is also contemplated that other configurations of the jamb strips  42  may be embodied and employed. As shown in  FIG. 5 , a first embodiment of the jamb strip  42   a  may have an attachment base  60   a  and a flange  72   a.  The attachment base  60   a  and the flange  72   a  may be fabricated from a unitary material. The attachment base  60   a  may define an interface surface  74   a  having a flat configuration. The interface surface  74   a  contacts the lateral side surface  52  of the side jambs  44 ,  46  or the top surface  54  of the top jamb  48  and aids in setting an offset distance between the flange  72   a  and the jamb  44 ,  46 ,  48 , as discussed below. The attachment base  60   a  may also define an upper surface  76   a.  A thickness of the attachment base  60   a  defined by a distance between the upper surface  76   a  and the interface surface  74   a  may be sufficiently thick so as to prevent a staple or nail  38  being inserted through the attachment base  60   a  via a staple gun or nail gun to secure the jamb strip  42   a  to the doorframe  14  from penetrating through the attachment base  60   a.  By way of example and not limitation the upper surface  76   a  may have a convex configuration wherein an attachment means (e.g., staple, nail, etc. and the like) may proceed therethrough and into the doorframe  14  to attach the jamb strip  42   a  to the doorframe  14 . More particularly, a distance between a fulcrum of the upper surface  76   a  and the interface surface  74   a  may be sufficient to prevent the nail  38 , staple  59  or other attachment means from penetrating through the attachment base  60   a.  The junction of the upper surface  76   a  and the flange  72   a  may have an abrupt change in direction. More particularly, the abrupt change in direction may be a vertical surface perpendicular to the interface surface  74   a  and/or a receiving surface  80   a.  The abrupt change in direction provides a guide  62   a  such that an installer may bump a staple gun or nail gun against the guide  62   a  such that the staple or nail  38  is aligned to the fulcrum of the upper surface  76   a.  In this manner, the installer may quickly staple a plurality of points along the attachment base  60   a  wherein the staples  59  are aligned to the fulcrum of the upper surface  76   a  by bumping the staple gun against the guide  62   a.  Moreover, a distance between the receiving surface  80   a  and the interface surface  74   a  may be greater than or equal to a thickness of the second flange  32  of the corner bead  26 . 
         [0042]    Referring now to  FIG. 6 , a second embodiment of the jamb strip  42   b  may also have an attachment base  60   b  and a flange  72   b.  The second embodiment of the jamb strip  42   b  may be identical with the first embodiment of the jamb strip  42   a  except that a nub  78   b  is formed on the receiving surface  80   a  of the flange  72   b.  Moreover, a distance between the nub  78   b  and the interface surface  74   b  may be less than or equal to a thickness of the second flange  32  of the corner bead  26 . The jamb strip  42   b  may also define an upper surface  76   b  and a guide  62   b  similar to the upper surface  76   a  and guide  62   a  of the first embodiment of the jamb strip  42   a.    
         [0043]    Referring now to  FIG. 7 , a third embodiment of the jamb strip  42   c  may have an attachment base  60   c  and a flange  72   c.  The flange  72   c  may be identical with the flange  72   b  of the second embodiment of the jamb strip  42   b  (see  FIG. 6 ). In particular, a nub  78   c  may be formed on a receiving surface  80   c  of the flange  72   c.  Alternatively, the flange  72   c  of the third embodiment of the jamb strip  42   c  may be formed in a similar fashion as the first embodiment of the jamb strip  42   a  (see  FIG. 5 ). In particular, the receiving surface  80   c  does not incorporate a nub  78   c.  The attachment base  60   c  of the third embodiment of the jamb strip  42   c  may have an inclined upper surface  76   c  and a concave interface surface  74   c.  The attachment base  60  may also have two foots  82  for engaging the lateral side surface  52  of the side jamb  44 ,  46  or the top surface  54  of the top jamb  48 . To install the jamb strip  42   c  on the jamb  44 ,  46 .  48 , the feet  82  of the attachment base  60   c  are laid on the lateral side surface  52  of the side jambs  44 ,  46  or the top surface  54  of the top jamb  48  with the flange  72   c  directed toward an exterior wall surface. A staple  59  or nail  38  is pierced through the attachment base  60   c  and into the jamb  44 ,  46 ,  48  to secure the jamb strip  42   c  to the jamb  44 .  46 .  48 . More particularly, the nail  38  or staple  59  penetrates the upper surface  76  and may urge the concave interface surface  74   c  against the lateral side surface  52  of the jamb  44 ,  46 ,  48 . 
         [0044]    Referring now to  FIGS. 8 and 8A , a fourth embodiment of the jamb strip  42   d  may have a similar configuration as that shown in the first embodiment of the jamb strip  42   a  (see  FIG. 5 ). Moreover, the flange  72   d  may have a cam surface  84  which extends from a distal end  56   d  of the flange  72   d  to a medial portion thereof. A cam lip  86  may be formed at a terminal end of the cam surface  84 . The flange  72   d  may also have a receiving surface  80   d  which together with the lip  86  and cam surface  84  and the lateral side surface  52  of the side jambs  44 ,  46  or top surface  54  of the top jamb  48  forms the receiving channel  40 . 
         [0045]    The receiving channel  40  may receive a second flange  32  of the corner bead  26 . More particularly, the second flange  32  of the corner bead  26  may have a pawl  88  formed at a distal end thereof. A thickness of the pawl  88  may be equal to or less than a distance between the interface surface  74   d  of the attachment base  60   d  and the receiving surface  80   d.  Also, the distance or thickness of the pawl  88  may be greater than a distance between the lateral side surface  52  of the side jambs  44 ,  46  or top surface  54  of the top jamb  48  and the edge  90  of the lip  86 . Moreover, a distance from the pawl  88  to an offset or an intersection  92  of the second flange  32  and the corner portion  34  of the corner bead  26  may be longer than or equal to a distance between the lip  86  and a distal edge  56   d  of the flange  72   d.  When the second flange  32  of the corner bead  26  is inserted into the receiving channel  40 , the pawl  88  is interposed between the lateral side surface  52  of the jamb  44 ,  46  or top surface  54  of the top jamb  48  and the cam surface  84 . The pawl  88  being thicker than a distance between the cam surface  84  and the lateral side surface  52  of the jamb  44 .,  46  or top surface  54  of the top jamb  48  deflects the flange  72   d  away from the jamb  44 ,  46 ,  48  until the pawl  88  passes the lip  86  of the flange  72 . At about the same time, the offset junction  92  engages a corner  94  of the jamb  44 ,  46 ,  48 . The second flange  32  of the corner bead  26  may not be removed from the receiving channel  40  because the pawl  88  engages the lip  86  (see  FIG. 8 ). If required, the second flange  32  of the corner bead  26  may be removed from the receiving channel  40  by lifting the flange  72   d  away from the jamb  44 ,  46 ,  48  with a flathead screwdriver or the like. 
         [0046]      FIGS. 9A-9C  illustrates a reversible jamb strip  42   e  which is referred to herein as the fifth embodiment of the jamb strip  42   e.  The fifth embodiment of the jamb strip  42   e  may have a lightening bolt configuration. In particular, the jamb strip  42   e  may have a first portion  96  and a second portion  98  which are integrally formed as a unitary piece. As shown in  FIG. 9A , the first portion  96  and the second portion  98  may be generally parallel but offset with respect to each other. The jamb strip  42   e  may be attached to the jamb  44 ,  46 ,  48 , as shown in  FIG. 9B  or in a reversed orientation, as shown in  FIG. 9C . In  FIG. 9B , the second portion  98  of the jamb strip  42   e  functions as the attachment base  60   e  and the first portion  96  of the jamb strip  42   e  functions as the flange  72   e.  Accordingly, the first portion  96  and the lateral side surface  52  of the jamb  44 ,  46  or the top surface  54  of the top jamb  48  forms the receiving channel  40 . A distance between the receiving surface  80   e  of the first portion  96  and the interface surface  74   e  of the second portion  98  defines a first width  100  of the receiving channel  40 . 
         [0047]    In  FIG. 9C , the first portion  96  of the jamb strip  42   e  may function as the attachment base  60   e  and the second portion  98  of the jamb strip  42   e  may function as the flange  72   e.  Also, a distance between the receiving surface  80   e  of the second portion  98  of the jamb strip  42   e  and the interface surface  74   e  of the first portion  96  of the jamb strip  42   e  may define a second width  102  of the receiving channel  40  formed by the receiving surface  80   e  of the second portion  98  and the jamb  44 ,  46 ,  48 . As shown by comparing  FIGS. 9B and 9C , the first width  100  of the receiving channel  40  is narrower compared to the second width  102  of the receiving channel  40  (see  FIG. 9C ). Although the first and second portions  98 ,  98  of the fifth embodiment of the jamb strip  42  are shown as being generally flat, it is also contemplated that nubs  78 , lips  86 , cam surfaces  84  and curved upper surfaces  76  may be formed on the first and second portions  96 ,  98  in varying combinations. 
         [0048]    The flange  72  may be attached to the attachment base  60 , as shown in  FIG. 5-9C . The flange  72  may define a receiving surface  80  which may be parallel with respect to the interface surface  74 . Although the receiving surface  80  is shown and described as being flat and parallel with the interface surface  74 , it is also contemplated that the receiving surface  80  may have other shapes and configurations such as concave, convex, skewed. etc. A distance between the receiving surface  80  and the interface surface  74  may be greater than or equal to a thickness of the second flange  32  of the corner bead  26 . In this manner, the second flange  32  may be slid into and out of the receiving channel  40  formed by the jamb strip  42  and the doorframe  14  (1 st , 2 nd , 3 rd  and 5 th  embodiments of the jamb strip). The flange  72  of the jamb strip  42  may be fabricated from a material such that the flange  72  is urged back toward its natural configuration when the second flange  32  of the corner bead  26  pushes against the receiving surface  80 . When the second flange  32  of the corner bead  26  is inserted into the receiving channel  40 , there may be an imperfect fit therebetween. The imperfect fit causes the second flange  32  to push against the receiving surface  80  to thereby open the receiving channel  40  and push the flange  72  away from the jamb  44 ,  46 ,  48 . Although the flange  72  is pushed away from the jamb  44 ,  46 ,  48 , the resilient and flexible nature of the jamb strip  42  prevents the flange  72  from breaking off of the attachment base  60 . Rather, the flange  72  pushes against the second flange  32  of the corner bead  26  to hold the corner bead  26  in place. 
         [0049]    As shown in  FIG. 3 , when the attachment base  60  is secured to the jamb  44 ,  46 ,  48 , the receiving surface  80  may be parallel with the lateral side surface  52  of the jamb  44 ,  46 . To retain the second flange  32  in the receiving channel  40 , a nub  78  (see  FIGS. 6 and 7 ; second and third embodiments of the jamb strips  42   b,    42   c ) may be formed on the receiving surface  80  which may urge the second flange  32  against the lateral side surface  52  of the jamb  44 ,  46 . To this end, a distance between a distal end of the nub  78  and the interface surface  74  may be less than or equal to the thickness of the second flange  32  of the corner bead  26 . Accordingly, when the second flange  32  is inserted into the receiving channel  40 , the flange  72  may be deflected slightly away from the jamb  44 ,  46 ,  48  and the nub  78  urges the second flange  32  against the lateral side surface  52  of the jamb  44 ,  46 ,  48  to hold the corner bead  26 . 
         [0050]    By way of example and not limitation, the jamb  44 ,  46 ,  48  may have a width of about 1.5 in.; a width of the flange  72  may be about 0.563 in.; a throat of the receiving channel  40  may be about 0.4375 in.; and a gap of the receiving channel  40  may be about 0.094 in. 
         [0051]    As stated above, the jamb strip  42  may be applied to a top jamb  48  having an arched configuration which is shown in  FIGS. 10 ,  10 A and  10 B. Similar to the construction shown in  FIGS. 2 and 3 , the jamb strip  42  may be used to install a corner bead  26  to the arched doorway  10 .  FIG. 10  shows a curved top jamb  48  of an arched doorway  10 . The jamb strip  42  may be attached to the hinge side jamb  46  and the latch side jamb  44  in the same manner discussed above. The jamb strip  42  may also be attached to the top or upper surface  54  of the curved top jamb  48 . The jamb strip  42  may be attached to the entire outer periphery of the top jamb  48  because the jamb strip  42  is flexible in its longitudinal length. The jamb strip  42  may be secured to the top jamb  48  by stapling or nailing the attachment base  60  of the jamb strip  42  to the top jamb  48 , as shown in  FIG. 10A . Installation of the doorframe  14  and door  16  to the opening or doorway  10  may be made in a similar fashion as discussed above. 
         [0052]    Referring now to  FIG. 11 , a flow chart of installing a jamb strip  42  to a doorframe  14  is as shown. In the method of installing the jamb strip  42  to the doorframe  14 , a jamb strip  42  may be aligned to the doorframe  110 . In particular, a distal edge  56  of the flange  72  may be flush with the exposed edge of the jamb  44 ,  46 ,  48 . Thereafter, the jamb strip  42  may be attached to the doorframe  112 . By way of example and not limitation, the jamb strip  42  may be stapled, nailed or the like to the jamb  44 ,  46 ,  48  via a staple gun or a nail gun. The staple or nail may be pierced through the attachment base  60  of the jamb strip  42  and into the jamb  44 ,  46 ,  48 . After the jamb strip  42  is attached  112  to the doorframe  14 , the doorframe  14  may be disposed within a doorway opening of a wall  12  and squared  114 . With the doorframe  14  squared  114 , a first flange  30  of a corner bead  26  may be attached  116  to a drywall  24  via a nail  38  or the like. Simultaneously or at about the same time, a second flange  32  of the corner bead  26  may be inserted  118  into a receiving channel  40  formed by the flange  72  of the jamb strip  42  and the lateral side surface  52  or top surface  54  of the jamb. At this point, the corner bead  26  is installed on the doorframe  14  and the exterior surfaces of the jamb  44 ,  46 ,  48  and drywall  24  may be painted  190 . 
         [0053]    The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.

Summary:
An apparatus for installing a corner bead to a doorway is provided. The apparatus may comprise a flange and an attachment base which are integrally connected to each other. The attachment base is securable to a doorframe such that upon securement, the flange and the doorframe form a receiving channel for receiving the corner bead therein. Such configuration maintains the structural integrity of the doorframe, maintains the length of the exposed edge of the doorframe and reduces cost to install the corner bead to the doorway.