Patent Publication Number: US-2005115178-A1

Title: Corner key for connecting profiles together and frame work assembly

Description:
FIELD OF THE INVENTION  
      The present invention relates to a corner key for connecting profiles together and also to a frame work assembly that includes such corner keys and profiles.  
     BACKGROUND OF THE INVENTION  
      Corner keys and lineal profiles are well known in the art, particularly in the context of windows and doors. A lineal profile in this context designates either a sash profile or a frame profile. A corner key is used to connect the sash or frame profiles together.  
      As it is known in the art, a sash element in the context of windows forms the mobile and working portion of a window. The sash element forms a perimeter called a sash frame that holds the necessary working hardware to allow the sash to slide, pivot, tilt, lock, etc. The sash element also includes the assembly of glazing and the edge-surrounding sash profiles. Sash profiles include top and bottom horizontal rails, and vertical stiles. A sash in the context of doors is most commonly referred to as a panel.  
      In the manufacture of a conventional sash or frame assembly, one typically starts with lineal profiles. These profiles are designed to incorporate specific functional features and to show a certain aesthetic.  
      Furthermore, although many materials of construction are conventionally utilized for the manufacturing of sash elements, such as wood and aluminum, presently available insulating window units that utilize a sash element formed of polyvinyl chloride polymers (PVC) are known to provide superior insulating properties.  
      A frame in the context of both windows and doors designates the fixed structural assembly portion of a window or a door. The frame in this context is used for example as a means of anchoring a window to a building. The frames contain mobile sashes and hold fixed glazing. Similarly as for sash elements, frame elements are typically made of PVC, but other materials, such as wood or aluminum, may be used as well.  
      Window frames and doorframes, are commonly made of four mainframe profiles. In a typical window frame, the top frame profile is usually identified as the header, the bottom one as the sill and the remaining two as the side jambs.  
      PVC window fabrication primarily involves the use of mitre-jointed corners. Accordingly, sash or frame profiles have their ends cut at an angle in order to form such mitre joints. Producing mitre joints requires great consistency in maintaining the shape of the profiles and a high degree of precision in cutting at the correct angle. Thus, very precise cutting equipment must be used to this effect. Once cut, the mating ends of the profiles are joined together and a corner key can be used to align and reinforce the mitre joint.  
      The following documents disclose mitre cut profiles that are connected with a corner key:  
                                               Inventors                                                    U.S. Pat. No.               4,240,765   OFFTERDINGER           4,453,855   RICHTER et al.           6,047,514   VERCH           6,073,412   VERCH           6,108,997   BLAIS et al.           Foreign Patent           EP-0,611,871   BLANPIED                      
 
      A disadvantage of producing mitre joints is that they require relatively expensive cutting equipment to make them. Such equipment also requires a larger working area and also more highly skilled labour.  
      It is also known in the art to use frame profiles that are straight cut. Most wood and aluminum profile assemblies commonly use butt-jointed corners, usually without corner keys. However, these assemblies require very complex machining preparation.  
      The following documents disclose butt-jointed profiles that also use a corner key to create the joint:  
                                                   U.S. Pat. No.   Inventors                          4,296,587   BERDAN           4,502,260   MACHLER           4,570,406   DIFAZIO           4,856,230   SLOCOMB           5,431,211   GUILLEMET           5,473,853   GUILLEMET et al.           5,485,705   GUILLEMET           5,547,011   DOTSON et al.           5,921,051   HOPE           5,960,605   HOPE           6,067,760   NOWELL           6,134,857   HOPE                      
 
      Typically, as disclosed in U.S. Pat. No. 6,067,760 (NOWELL) for example, one end of the corner key is inserted inside a profile. A screw is then driven in an outer face of the profile and through the corner key to prevent them from disengaging from each other.  
      This technique of using perpendicular fastener insertion for joining together a profile to its corner key is satisfactory only when using certain types of materials, such as aluminum or pultrusion profiles. However, perpendicular fastener insertion through thermoplastic (PVC) profiles is not satisfactory because of the low tear resistance of such materials.  
      U.S. Pat. No. 5,105,581 (SLOCOMB, Jr.) discloses a corner key that is only temporarily connected to a header by means of screws inserted longitudinally in a screw boss of the header. No screw is longitudinally or axially inserted along the jambs. These screws temporarily hold the header to the corner key before an ultra-sound welding operation permanently secures the frame profiles to the corner key. This technique is disadvantageous in that the frame profiles are to be secured to the corner key in two steps, thus increasing manufacturing time. Furthermore, there is no compression at all the interfaces of the profiles and the corner key that ensures a tight contact between them.  
      Korean utility model 1996-0068593U (LEE) discloses a corner key that is exclusively connected to profiles by means of axial screws. The corner key has openings that allow the insertion from the outside of reinforcement metals through the corner key and the profiles, after these are connected together, so as to prevent the phenomenon of bending of plastic frames.  
      None of the above mentioned documents address the problem of the possibility of water and air leakage through the joints between the profiles and the corner keys, nor any description of preventive measures to preclude such leakages. Furthermore, none of the above listed documents mention the use of corner keys, profiles and frame work assemblies in a context besides windows and doors.  
      Accordingly, there exists a need in the market for a relatively inexpensive frame work assembly having corner keys and profiles that can be tightly fitted to each other, with their joints being well sealed to avoid leakage problems.  
      Besides tight fitting and well sealed joints, it is known in the art to use a barrier system in the design, which is named the “Pressure-Equalized Rain-Screen Principle”. This known principle is based on an outer “water-shed” barrier, in combination with a continuous, inner air barrier, whilst the air chamber between these two barriers has to be in communication with the outside ambient air pressure. To achieve the latter condition, openings to the outside have to be created in the sill profiles of sashes and frames. Furthermore, any accumulation of water within the sash and frame profile cavities has to be evacuated through such openings as well. The preparation of such openings requires special equipment and affords extra labour.  
      There is therefore also a need in the market for a relatively inexpensive frame work assembly that could incorporate the pressure equalization and rain screen principle.  
     SUMMARY OF THE INVENTION  
      It is an object of the present invention to provide a corner key and a frame work assembly that can overcome the prior art deficiencies and shortcomings.  
      It is another object of the present invention to provide a corner key for connecting two or more profiles together and forming a frame work assembly in a simple, yet reliable manner with a minimal effort and low manufacturing costs.  
      According to the present invention, there is provided a corner key for connecting two or more profiles together, each profile having an end face, a longitudinal drainage and venting passage and a longitudinal securing bore, the corner key comprising: 
          first and second adjacent inner corner faces, first and second adjacent outer corner faces opposite to the inner corner faces, and opposite inner and outer side corner faces extending between the inner and outer corner faces, the inner corner faces being shaped for respective coupling with the profiles;     first and second guide arrangements having a tab projecting on one of the inner corner faces and the end faces of the profiles, and an accommodating anchoring channel in the other one of the end faces of the profiles and the inner corner faces, the tab being shaped for fit engagement into the accommodating anchoring channel;     first and second bores each extending between a different one of the outer corner faces and one of the inner corner faces opposite to the one of the outer corner faces, the bores being in registration with the securing bores of the profiles when the profiles are coupled with the corner key;     first and second fasteners respectively insertable in the bores of the corner key and the profiles in a locking arrangement in which the corner key and the profiles are connected together; and     a drainage and venting passage extending between the first and second inner corner faces, the drainage and venting passage having opposite end openings in registration with the drainage and venting passages of the profiles when the profiles are coupled with the corner key.        

      According to another aspect of the present invention, there is also provided a frame work assembly comprising: 
          a) two or more lineal profiles, each having an end face, a longitudinal drainage and venting passage and a longitudinal securing bore; and     b) one or more corner keys, each corner key for connecting the two or more profiles together, each corner key having: 
            first and second adjacent inner corner faces, first and second adjacent outer corner faces opposite to the inner corner faces, and opposite inner and outer side corner faces extending between the inner and outer corner faces, the inner corner faces being shaped for respective coupling with the profiles;     first and second guide arrangements having a tab projecting on one of the inner corner faces and the end faces of the profiles, and an accommodating anchoring channel in the other one of the end faces of the profiles and the inner corner faces, the tab being shaped for fit engagement into the accommodating anchoring channel;     first and second bores each extending between a different one of the outer corner faces and one of the inner corner faces opposite to the one of the outer corner faces, the bores being in registration with the securing bores of the profiles when the profiles are coupled with the corner key;     first and second fasteners respectively insertable in the bores of the corner key and the profiles in a locking arrangement in which the corner key and the profiles are connected together; and     a drainage and venting passage extending between the first and second inner corner faces, the drainage and venting passage having opposite end openings in registration with the drainage and venting passages of the profiles when the profiles are coupled with the corner key.    
               

      Preferably, the tabs project respectively from the first and second inner corner faces of the corner key for fit engagement into the accommodating anchoring channels in the end faces of the profiles, and the bores of the corner key are located adjacent to the tabs of the corner key.  
      Preferably, the outer side corner face has a water evacuation and pressure equalization vent in communication with the drainage and venting passage of the corner key and the drainage and venting passage of each profile.  
      Preferably, the corner key and profiles are made of polyvinyl chloride polymers (PVC).  
      Preferably, the first and second inner corner faces respectively comprise first and second recesses located adjacent to the tabs, and the recesses are provided with a sealing element sealing the corner key with the profiles when the profiles are coupled to the corner key.  
      Preferably, the inner and outer side corner faces comprise extension fins for masking joints between the side corner faces and the profiles when the profiles are coupled to the corner key.  
      The invention as well as its numerous advantages will be better understood by reading of the following non-restrictive description of a preferred embodiment made in reference to the appending drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective exploded view of a corner key and profiles according to a preferred embodiment of the present invention;  
       FIG. 2A  is a cross sectional partial view at line II-II of  FIG. 1  showing a screw, corner key and profile before assembly, and wherein the corner key is provided with a recess without its sealing bead, according to a preferred embodiment of the present invention;  
       FIGS. 2B  is a cross sectional partial view of the screw, corner key and profile of  FIG. 2A  after assembly, according to a preferred embodiment of the present invention;  
       FIG. 3A  is a cross sectional partial view at line II-II of  FIG. 1  showing a screw, corner key and profile before assembly, and wherein the corner key is provided with a sealing bead in a recess, according to a preferred embodiment of the present invention;  
       FIG. 3B  is a cross sectional partial view of the screw, corner key and profile of  FIG. 3A  after assembly, according to a preferred embodiment of the present invention;  
       FIG. 4  is a perspective view of a corner key with an arrow showing water evacuation, according to a preferred embodiment of the present invention; and  
       FIG. 5  is a perspective view of a corner key with arrows showing air pressure equalization, according to a preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      Referring to  FIG. 1 , there is shown a corner key  10  according to a preferred embodiment of the present invention. Also shown are portions of two profiles, one corresponding to a sill  12  and the other to a jamb  14  that are to be connected together by means of the corner key  10  to form part of a window frame assembly.  
      Those skilled in the art will understand that although only two window frame profiles  12 ,  14  are illustrated, the teachings according to the present invention are also applicable to any number of profiles or to any other general purpose profiles that are to be jointed with a corner key. In particular, it will be understood that the present teachings apply not only to window frames, but also to door frames, and to other similar structural assemblies as well.  
      The corner key  10  that is illustrated is preferably used as a right side lower corner key, but those skilled in the art will also understand that this corner key  10  can be modified so that it can also be used in another position of the frame, as will be described below.  
      The profiles  12 ,  14  that are to be used with the corner key  10  can be made from various materials and by means of different techniques. For example, the profiles  12 ,  14  can be made of extruded aluminum, steel, brass or other metals. Alternatively, the profiles  12 ,  14  can be formed by means of pultruded plastics, thermoplastics, such as PVC, or thermoset plastics. It is to be understood, however, that other suitable materials and techniques may be used to make these profiles as is well known in the art.  
      As shown, each profile  12 ,  14  that is to be connected to the corner key  10  preferably has three types of apertures that are apparent on the end faces  13 ,  15  of each profile  12 ,  14 . These apertures include a longitudinal anchoring channel  16 ,  18 , a longitudinal drainage and venting passage  20 ,  22  and one or more longitudinal securing bores  24 ,  26 . It is advantageous to form these apertures during the fabrication of these profiles  12 ,  14  so as to diminish the costs of production. In the case of, for example, a lineal extrusion process, these apertures are easily created when forming each profile  12 , 14 . One could also create these apertures later on, but this would increase manufacturing processing times and ensuing costs.  
      The longitudinal anchoring channels  16 ,  18  do not need to extend all the way across each profile  12 ,  14 , but rather can take the shape of a recess with a predetermined depth as will be described below. Furthermore, the anchoring channels  16 ,  18  could also be replaced with tabs as will be described below.  
      Preferably, the corner key  10  has a generally three-dimensional rectangular shape with two adjacent inner corner faces  28 ,  30 , two adjacent outer corner faces  32 ,  34 , and opposite inner and outer side corner faces  36 ,  38  extending between the inner and outer corner faces  28 ,  30 ,  32 ,  34 . Similarly as explained in relation with the profiles  12 ,  14 , the corner key  10  may be made according to different techniques and from different materials. For example, it can be formed, cast or molded by using metals, thermoplastics or thermoset plastics.  
      The inner corner faces  28 ,  30  are shaped for respective coupling with the profiles  12 ,  14 , preferably with flat portions thereof matching those of the straight cut profiles  12 ,  14 . Of course, it will be understood that the corner key  10  may have shapes other than a generally rectangular one, depending on the particular application or preferred design. For example, the corner key could be polygonal, such as hexagonal, or have any suitable shape, such as curvilinear, as long as it can be properly connected to appropriately shaped profiles. Furthermore, the corner key  10  of the present invention may be modified so as to be able to connect more than two profiles together as it will be apparent to those skilled in the art.  
      In the illustrated embodiment, the corner key  10  has two tabs  40 ,  42  that project respectively from the inner corner faces  28 ,  30 . These tabs  40 ,  42  are shaped for fit engagement into the anchoring channels  16 ,  18  of the profiles  12 ,  14 . It is preferable that the longitudinal anchoring channel  16 ,  18  of each profile  12 ,  14  and respective tabs  40 ,  42  have matching shapes in order to facilitate fit engagement of the tabs  40 ,  42  into the anchoring channels  16 ,  18 . As illustrated, the tabs  40 ,  42  and the anchoring channels  16 ,  18  may have matching L or S shapes. It is also preferable that the tabs  40 ,  42  be tapered so as to further facilitate their fitting into the anchoring channels  16 ,  18 . The tabs  40 ,  42  are preferably continuous in shape and extend along the inner corner faces  28 ,  30  starting from close to the edge of the inner side corner face  36  towards the outer side corner face  38 , as illustrated. Additional tabs (not shown) may also project from the inner corner faces  28 ,  30  if more than two profiles are to be used with a single corner key. Of course, the tabs may have different designs than those illustrated herein, if desired. Preferably, the tabs  40 ,  42  have a continuous shape extending lengthwise between the inner and outer side corner faces  36 ,  38 .  
      It should also be understood that the guide arrangement formed of the tabs  40 ,  42  and channels  16 ,  18  as described above can be modified according to design preferences. For example, profile tabs may project from the end faces  13 ,  15  of the profiles  12 ,  14  in replacement of the anchoring channels  16 ,  18 , while the inner corner faces  28 ,  30  may be provided with channels or recesses that receive these profile tabs. It is also contemplated that the tabs may be removable, thus consisting in separate pieces from both the corner key  10  and profiles  12 ,  14 . Indeed, in such a configuration both the end faces  13 ,  15  of the profiles  12 ,  14  and the inner corner faces  28 ,  30  could then be provided with channels or recesses for receiving portions of these removable tabs.  
      Furthermore, even though the tabs  40 ,  42  are shown to be at a right angle from each other, this does not necessarily have to be the case for all designs. Indeed, the tabs  40 , 42  may also form acute or obtuse angles with each other.  
      The corner key  10  that is illustrated may be used in rectangular frame work assemblies, however a modification of the angles between the inner and outer corner faces  28 ,  30 ,  32 ,  34  and/or tabs  40 ,  42  can be made so as to obtain differently shaped frames works, such as triangular shapes or rhomboid shapes with acute and obtuse angles.  
      The corner key  10  illustrated has multiple bores  44 ,  46 , each extending between a different one of the outer corner faces  32 ,  34  and one of the inner corner faces  28 ,  30  opposite to the one of the outer corner faces  32 ,  34 . In the corner key  10  that is illustrated, the bores  44 ,  46  are non-intersecting because of the kind of fastener (a screw) that is used, but this need not be the case as it will be further explained below. Furthermore, only one bore  44 ,  46  may extend across each of the inner corner faces  28 ,  30  and outer corner faces  32 ,  34 . However, if desired, and for increased rigidity, several bores  44 ,  46  may extend across each of the inner corner faces  28 ,  30  and outer corner faces  32 ,  34 . In the illustrated example, the corner key  10  has three bores  44 ,  46  extending across each of the inner corner faces  28 ,  30  and outer corner faces  32 ,  34 .  
      As it will be appreciated, when the profiles  12 ,  14  are inserted into the tabs  40 ,  42  of the corner key  10 , the bores  44 ,  46  are in registration with the respective securing bores  24 ,  26  in the profiles  12 ,  14 .  
      In order to create a stable and durable locking arrangement between the corner key  10  and the profiles  12 ,  14 , a set of fasteners  48 ,  50  are respectively inserted in the bores  44 ,  46  of the corner key  10  and the securing bores  24 ,  26  of the profiles  12 ,  14 . Preferably, the fasteners  48 ,  50  are metal screws but any other type of fastener may be used for the purpose of locking the corner key  10  to its profiles  12 ,  14 . For example, the fastener may be a serrated metal rivet, a bonded rivet or a fusion welded rivet. In another embodiment of the invention, the fastener may be a certain type of adhesive glue or sealer that hardens inside the bores  44 ,  46  of the corner key and the securing bores  24 ,  26  of the profiles  12 ,  14 . In that particular case, and as already mentioned above, the bores  44 ,  46  need not to be non-intersecting with each other. Alternatively, an ultrasound weld may also be used instead of the adhesive.  
      In the illustrated example, three screws  48  are inserted in the bores  44  of the corner key  10  from the outer corner face  32  and into the securing bores  24  of profile  12 . Similarly, three screws  50  are inserted in the bores  46  of the corner key  10  from the outer corner face  34  and into the securing bores  26  of profile  14 . It is to be understood, however, that in another embodiment of the invention, only a single screw can be inserted from each of the outer corner faces  32 ,  34 , into the bores  44 ,  46  and securing bores  24 ,  26 . These bores would then be preferably located in the middle of the corner key  10 .  
      The fasteners  48 ,  50  are solely responsible for the permanence of the frame work assembly (not shown) that can be built. The axial or longitudinal insertion of the fasteners  48 ,  50  relative to the profiles  12 ,  14  assures an intimate contact between the cut end faces  13 ,  15  of the profiles  12 ,  14  and the mating inner corner faces  28 ,  30  of the corner key  10 . A sealing element, such as a foamed hot-melt sealing bead  60 , in addition to the fasteners  48 ,  50  may assist in the permanence of the frame work assembly. The sealing beads  60  provide the corner key  10  with long-lasting sealing properties to intimately seal the interfaces between the lineal profiles  12 ,  14  and the corner keys.  
      The corner key  10  is also provided with a drainage and venting passage  52  extending between the first and second inner corner faces  28 ,  30 . This drainage and venting passage  52  has opposite end openings  54 ,  56  in registration with the drainage and venting passages  20 ,  22  of the profiles  12 ,  14  when these are coupled with the corner key  10 . As it will be further explained below with reference to  FIGS. 4 and 5 , the purpose of the drainage and venting passage  52  in the corner key  10  and the drainage and venting passages  20 ,  22  in the profiles  12 ,  14  is to allow water and air to flow therethrough. The drainage and venting passage  52  of the corner key  10  acts as an opening for pressure equalization within the rain screen principle discussed above.  
      The sealing element can also include silicone or a solid sealant such as preformed or stamped foam gaskets. In addition to reinforcing the permanence of the joint at the interface between the end faces  13 ,  15  of the profiles and the inner corner faces  28 ,  30  of the corner key  10  as mentioned above, this sealing element eliminates possible water leaks from the drainage and venting passage  52  dripping into the wall cavity surrounding a window or a door frame, for example.  
      Preferably, the sealing element, such as the foamed hot-melt sealing bead  60 , is applied onto the inner adjacent corner faces  28 ,  30  for sealing the drainage channel  52  of the corner key with those of the profiles  12 ,  14  when the profiles  12 ,  14  are coupled to the corner key  10 .  
      It is also preferable that the inner corner faces  28 ,  30  of the corner key  10  be provided with strategically positioned sealing recesses  63  located adjacent to the base of the tabs  40 ,  42 , where they meet the inner corner faces  28 ,  30  of the corner key  10 . The sealing recesses  63  are shaped to receive and contain the sealing bead  60 , and preclude it from dripping when it is laid therein. As illustrated, the sealing bead  60  is preferably laid along a continuous line adjacent to each of the tabs  40 ,  42  and the drainage and venting passage  52 .  
      Preferably, the bores  44 ,  46  of the corner key  10  are located adjacent to the tabs  40 ,  42  of the corner key  10 . In this manner, the screws  48 ,  50  are strategically positioned, adjacent to the critical contact line formed by the tabs  40 ,  42  and the sealing beads  60 .  
      Referring to  FIGS. 2A and 2B , there is shown an alternative embodiment of the present invention wherein no sealing bead  60  is applied in the between the corner key  10  and profile  12 . However, the inner corner face  28  is still provided with the sealing recess  63  that is formed of a sloped wall surface  68  on the inner corner face  28 . This sloped wall surface  68  assists in the action of wedging the lineal profile  12  into the sealing recess  63 .  
      Referring to  FIGS. 3A and 3B , there is shown the same configuration as in  FIGS. 2A and 2B , but with the sealing bead  60  being applied in the sealing recess  63 , for further enhancing the sealing feature of the design.  
      Preferably, and as is best illustrated with reference to  FIGS. 1, 2A ,  2 B,  3 A and  3 B, the inner and/or outer side corner faces  36 ,  38  have extension fins  70  for masking the joints  72  that are created between the corner key  10  and the profiles  12 ,  14 , when the profiles  12 ,  14  are coupled to the corner key  10 . In other words, the inner and outer side corner faces  36 ,  38  can be extended to overlap the plane of contact between the cut faces  13 ,  15  of the profiles  12 ,  14  and the designated contact inner corner faces  28 ,  30  of the corner key  10 . The added feature of such face extensions is the structural overlapping and the visual masking of the assembly joint  72  between the cut end faces  13 ,  15  of the lineal profiles  12 ,  14  and the corresponding faces of the corner key for the purpose of covering up irregularities of the profiles&#39;  12 ,  14  end-cuts  13 ,  15 , of guiding the application of the sealing bead  60 , and of masking any sealing bead overflow. The extension of corner surfaces for the purpose of overlapping the assembly joint  72  can be applied to other surfaces of the corner key  10 , particularly to those which remain exposed to the eye after the completion of installation of an assembled window or door.  
      Advantageously, the extension fins  70  provided on the inner and outer side corner faces  36 ,  38  may also form part of the sloped wall surface  68  of the sealing recess  63  provided on the inner corner faces  28 ,  30 .  
      Furthermore, those skilled in the art will understand, the corner key  10  may be provided without any sealing recesses  63  and sealing beads  60 . Such a configuration may be advantageous because it is easier and less expensive to make. However, when a sealing bead is applied between the corner key and the profile, there may be leakage problems as there is not enough sealant mass to compensate for irregular contact faces and/or gaps created by distortion and by movement of contact surfaces at the joints.  
      Referring to  FIGS. 4 and 5 , there is shown another embodiment of the present invention showing a corner key  10  that is similar to the one shown in  FIG. 1 . As mentioned above, the corner key  10  that is illustrated in  FIGS. 1, 4  and  5  is preferably used as a right-side lower corner key because its outer side corner face  38  is provided with a water evacuation vent  58  that is in communication with the drainage and venting passage  52  of the corner key  10  and the drainage and venting passage  22 ,  20  of each profile  12 ,  14  when these are coupled together. As those skilled in the art will understand, upper corner keys do not need to be provided with such vent  58 .  
      In use, when water infiltrates into the drainage and venting passages  20 ,  22  of the profiles, such as in case of rain or high humidity, this configuration allows for water evacuation through the vent  58 . It is preferable that the vent  58  and the drainage passage  52  have substantially flush bottom surfaces declining toward the outer side corner face  38 . This downward slope facilitates the water evacuation as depicted by arrow and water drop  64 .  
      As shown in  FIG. 5 , the corner key  10  with its vent  58  also has the advantage of providing pressure equalization between the inside of the profiles  12 ,  14  and the ambient air outside, as depicted by arrow  66 .  
      Preferably, the drainage and venting passage  52  has an opening  59  in one of the inner corner faces  28 ,  30 . In the illustrated example, the opening  59  is on the inner corner face  30 , above the end opening  54  of the drainage and venting passage  52 . The corresponding profile  14  also has its drainage and venting passage  22  provided with an opening  61  that communicates with the opening  59 . These openings  59 ,  61  are provided so that sashes or any component of a frame can be inserted therein, as those skilled in the art will understand.  
      Advantageously, the inner and outer side corner faces  36 ,  38  can bear logos, trademarks, information or decoration designs for advertisement, publicity and/or decoration purposes. Also, the inner side corner face  36  may have a chamfered and rounded corner  62  extending between the inner corner faces  28 ,  30 . A chamfered and rounded corner may also be provided between the outer corner faces  32 ,  34 . The chamfered and rounded corner  62  provides a design that may be appealing, and which is visible on an assembled sash or window frame.  
      Use of the corner key of the present invention eliminates the need for expensive production equipment and large floor space, and therefore provides a cost efficient solution for the fabrication of window or door frame assemblies in particular, but also for general purpose frame work assemblies.  
      Furthermore, the frame work assembly according to the present invention eliminates the need for mitre-cuts, welding and weld cleaning, nor is any punching, routing or drilling needed since all operational functions of a complete window or door assembly are incorporated into the corner keys. It also allows the use of unskilled labor due to the simplicity of its assembly process.  
      An advantage of the present invention is that the pressure equalization and water evacuation openings are provided as an integral part of the design of the corner keys, thus eliminating the need for the otherwise required additional machining effort.  
      The frame work assembly of the present invention may be used for the creation of windows having any type of operation, such as fixed, horizontally and vertically sliding, inward and outward projecting, etc.  
      The frame work assembly may also be used for the creation of doors of any type of operation, such as sliding, inward and outward projecting, etc.  
      Although the present invention has been exemplified with frame profiles, those skilled in the art will understand that the present teachings are also applicable to sash profiles.  
      Furthermore, although the profiles are mainly used in the context of a window or door frame assembly, those skilled in the art will understand that the corner key and profiles of the present invention may be used to assemble such diverse frame work assemblies as walls of a building, a container, or any general purpose structure or frame work assembly.  
      Although a preferred embodiment of the present invention has been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to this precise embodiment and that various changes and modifications may be effected therein without departing from the scope or spirit of the present invention.