Patent Publication Number: US-8966821-B2

Title: Dual hinged door mechanism

Description:
FIELD OF THE INVENTION 
     This invention relates to a hinged door and more particularly to a door lifting and support, latch locking and handle assemblies. 
     SUMMARY 
     An example of an interlocking assembly for a dual hinged door includes a first latch rotatably secured to the door at a first side of the door. The first latch is rotatable between a closed position and an open position. A second latch is rotatably secured to the door at a second side of the door, opposite the first side. The second latch is rotatable between a closed position and an open position. A first interference member is rotatably secured to the door and a second interference member is rotatably secured to the door, wherein the first interference and the second interference members are positioned adjacent one another. It further includes, a first latch linkage arm rotatably connected to the first latch at a first portion of the first latch linkage arm and rotatably connected to the first interference member at a second portion of the first latch linkage arm spaced apart from the first portion, such that rotation of the first latch from the closed position to the open position moves the first latch linkage arm and causes the first interference member to rotate. Additionally, a second latch linkage arm is rotatably connected to the second latch at a first portion of the second latch linkage arm and rotatably connected to the second interference member at a second portion of the second latch linkage arm spaced apart from the first portion, such that rotation of the second latch from the closed position to the open position moves the second latch linkage arm and causes the second interference member to rotate. The first interference member is positioned in a path of rotation of the second interference member, blocking rotation of the second interference member, with the first latch in the open position and the second latch in the closed position. 
     An example of an assembly for lifting and supporting a door relative to a frame includes a first upper hinge pin connected to a top portion of the frame and a first lower hinge pin connected to a bottom portion of the frame. A lift pin is connected to the door and positioned to extend in a direction forming an angular relationship with a plane formed by the door with the door hinged about the first upper and first lower hinge pins and the door in an opened position. A lift pin support member is secured to the frame and positioned to engage the lift pin such that the support member provides vertical support of the door and positions the door into a predetermined elevation relative to the frame, with the door in a closed position. Additionally, a door support structure is associated with the first lower hinge pin, wherein the door support structure extends away from and in angular relationship to a longitudinal axis of the first lower hinge pin and wherein the support structure provides support to the door with the door hinged about the first upper and first lower hinge pins and with the door in an open position. 
     An example of handle assembly for a door includes a handle rotatable about an axis of rotation of the handle assembly, a drive member connected to the handle and rotatable about the axis of rotation and a drive pin member connected to the drive member and extending radially from the drive member. Also provided is a drive receiving member rotatably engaged with the drive member and rotatable about the axis of rotation and the drive receiving member defines an opening including a first and second spaced apart opposing sidewalls, wherein the drive pin member is positioned within the opening and is movable within the opening. A cam is connected to the drive receiving member and rotatable with the drive receiving member about the axis of rotation. A torsion spring is positioned about the axis of rotation with the torsion spring having a first arm connected with the handle such that the first arm moves with the handle and a second arm positioned in proximity to the cam such that the second arm moves with the cam. This handle assembly is positionable in a first closed position, with the handle in a first position, the cam in a first position, the torsion spring in a first unloaded position and the drive pin member positioned adjacent the first sidewall of the opening. The handle assembly is also positionable in an open position, with the handle in a second position, the cam in a second position, the torsion spring in a second unloaded position and the drive pin member adjacent the first sidewall of the opening. The handle assembly is further positionable in a second closed position, with the handle in the first position, the cam in the second position, the torsion spring in a loaded position and the drive pin member positioned spaced apart from the first sidewall of the opening. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front side elevation view of a cabinet frame with a front door in a closed position; 
         FIG. 2  is a front right side perspective view of  FIG. 1  showing the front door in a closed position and the frame of the cabinet; 
         FIG. 3  is the view of  FIG. 2  with the front door in an open position and hinged to the left side of the cabinet frame; 
         FIG. 4  is a rear perspective view of the cabinet frame as shown in  FIG. 3  without a front door and with a rear door in an open position and hinged to the frame on a left side of the frame; 
         FIG. 5  is a back side elevation view of the front door as shown in  FIG. 1  without the door secured to the frame of the cabinet frame; 
         FIG. 6  is a top plan view of the interlocking assembly positioned at the bottom portion of the door shown along line  6 - 6  in  FIG. 3  wherein the door is hinged to the left side of the frame of the cabinet and the right side of the door in an open position; 
         FIG. 7  is an enlarged view of a portion of the interlocking assembly as shown within circle designated as  7  in  FIG. 6 ; 
         FIG. 8  is a partial broken away elevation view as viewed along line  8 - 8  as shown in  FIG. 7  with the front skin portion of the door partially broken away; 
         FIG. 9  is an enlarged view of a portion of the interlocking assembly as shown within circle designated as  9  in  FIG. 7 ; 
         FIG. 9A  is an elevation view of a partial cut away view taken along line  9 A- 9 A in  FIG. 9 ; 
         FIG. 9B  is the view of  FIG. 9  with the door being moved toward a closed position wherein the first latch is initially engaging a hinge pin of the cabinet frame; 
         FIG. 9C  is the view of  FIG. 9B  with the door moved to a closed position with first latch in a closed position; 
         FIG. 10  is an enlarged view of the interference members of the interlocking assembly as seen within circle designated  10  in  FIG. 6  wherein a first latch is in an open position and the second latch is in a closed; 
         FIG. 11  is the view of  FIG. 10  showing the position of the interference members with the first and second latches both in a closed position; 
         FIG. 12  is an enlarged view of that which is circled and designated as  12  in  FIG. 3 ; 
         FIG. 13  is an enlarged view of that which is circled and designated as  13  in  FIG. 3 ; 
         FIG. 14  is a front left side perspective view of  FIG. 3 . of the cabinet with the front door to the right side of the frame and the door is in an open positioned; 
         FIG. 15  is an enlarged view of that which is circled and designated as  15  in  FIG. 14 ; 
         FIG. 16  is an enlarged view of that which is circled and designated as  16  in  FIG. 14 ; 
         FIG. 17  is an enlarged view of that which is circled and designated as  17  in  FIG. 14 ; 
         FIG. 18  is an enlarged view of that which is circled and designated as  18  in  FIG. 14 ; 
         FIG. 19  is an enlarged view of that which is circled and designated as  19  in  FIG. 3 ; 
         FIG. 20  is an enlarged view of that which is circled and designated as  20  in  FIG. 3 ; 
         FIG. 21  is partial perspective view of a lower portion of the front door as shown in  FIG. 3  showing a portion of the lift pin assembly without showing the frame of the cabinet; 
         FIG. 22  is an enlarged view of that which is circled and designated as  22  in  FIG. 21 ; 
         FIG. 23  is a partial cut away elevation view as seen along line  23 - 23  in  FIG. 21 ; 
         FIG. 24  is a cross section view as seen along line  24 - 24  in  FIG. 23  along with the lift pin support member secured to the frame with the door approaching a closed position; 
         FIG. 25  is the view seen in  FIG. 24  with the door in a closed position along with a phantom view of the lift pin in a position wherein the door would be in an open position; 
         FIG. 26  is a perspective view of an embodiment of the door support structure with a partial view of door approaching a closed position; 
         FIG. 27  is an elevation view along line  27 - 27  of  FIG. 26  with the door in a closed position; 
         FIG. 28  is a perspective view of another embodiment of the door support structure engaged to the door with the door in a closed position; 
         FIG. 29  is perspective exploded view of the embodiment of the door support structure shown in  FIG. 28 ; 
         FIG. 30  is a cross section view as seen along line  30 - 30  of  FIG. 28 ; 
         FIG. 31  is a top front perspective exploded view of the handle assembly positioned on a right side of a door in a first closed position, positioning the locking rods into an extended locked position; 
         FIG. 32  is a top rear perspective exploded view of the handle assembly as shown in  FIG. 31 ; 
         FIG. 33  is a top plan view of the torsion handle assembly shown in  FIG. 31  assembled with a partial cutaway view of a portion of the torsion spring; 
         FIG. 34  is a perspective back side view of the door with the handle assembly as shown in  FIG. 31  assembled, with the door handle assembly in the first closed position and with a portion of the torsion spring cut away; 
         FIG. 35  is the exploded perspective view of the handle assembly shown in  FIG. 31  with the handle in an open position which positions the locking rods in a retracted unlocked position; 
         FIG. 36  is a perspective and partial cutaway back side view of the door handle assembly as shown in  FIG. 35  assembled, with the door handle assembly in the open position with a portion of the cam and the torsion spring cut away; 
         FIG. 37  is the exploded perspective view of the handle assembly as shown in  FIG. 35  with the handle now in a second closed position with the locking rods in the retracted position; 
         FIG. 38  is a perspective back side view of the door with the handle assembly of  FIG. 37  assembled and in the second closed position with a portion of the torsion spring cut away; 
         FIG. 39  is a top front perspective exploded view of the torsion handle assembly of  FIG. 31  for a handle to be positioned on a left portion of the door and in a first closed position; and 
         FIG. 40  is a perspective and partial cutaway back side view of the door handle assembly as shown in  FIG. 39  assembled, with a portion of the torsion spring cut away. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIGS. 1-4 , an embodiment of network cabinet  10  of present invention is shown. Network cabinet  10  is contemplated to carry a variety of network related equipment, such as network switches, patch panels and/or servers and will be appropriately configured to handle the particular equipment that is needed. To optimize the use of network cabinet  10 , dual hinged doors are used to provide ease in access to interior portions of network cabinet  10  in order to install, maintenance, wire and remove equipment as needed, in a safe and effortless manner. 
     For ease in understanding orientations with respect to describing network cabinet  10 , if not otherwise stated, the right and left side of network cabinet  10  will be identified as such from a view point taken from facing the front side “F” of network cabinet  10 . For example, viewing from the front side “F” of cabinet  10 , in  FIG. 3 , front door  12  is hinged on the left side of frame  16  of cabinet  10 . Also, in  FIG. 4 , viewing from the front side “F”, rear door  17  is hinged on the left side of frame  16  of cabinet  10 . When referring to the “rear side” or a “back side” of a door such as front door  12 , this will be the side of the door that faces the interior of the cabinet with the door in a closed position. Correspondingly, for example, the side of front door  12  that is seen from outside of network cabinet  10  with front door  12  in a closed position, will be referred to as the “front side” or “outside side” of front door  12 . 
     As seen in  FIG. 1 , front door  12  is positioned on the front side “F” of network cabinet  10 . In certain embodiments of the present invention, network cabinet  10  provides casters  14  mounted to a bottom portion “B” of frame  16 , as can be seen in  FIGS. 1-4 . Casters  14  provide ease in rolling network cabinet  10  to a desired position and/or location. In this embodiment, network cabinet  10  has a dual hinged door arrangement for opening both front and rear doors  12 ,  17  wherein each door can be hinged or unhinged selectively from either the left or right side of frame  16  of cabinet  10 . Each door is provided two handles, one for opening the door with the hinge positioned on the right side of cabinet  10  and a second handle for opening the door with the hinge positioned on the left side of the cabinet  10 . Since both front and back doors  12  and  17  are generally structured the same but face opposing directions, front door  12  will be described herein. Left handle  18  which is part of handle assembly  18 ′ is positioned on the left portion of front door  12 , as you face front door  12 , and right handle  20  which is part of handle assembly  20 ′ is positioned on a right portion of front door  12 . For rear door  17 , with the user facing door  17 , handle  18  would be positioned on the left side portion of door  17  and handle  20  would be positioned on the right hand portion of door  17 . 
     Frame  16 , as seen in  FIGS. 2-4 , in this embodiment, is constructed of a conductive material such as steel which includes a pair of front vertical spaced apart frame rails  22  and a pair of rear vertical spaced apart frame rails  24 . These pairs of vertical frame rails  22  and  24  are connected together at a bottom portion “B” of cabinet  10  by securing a pair of front to back base beams  26  and a pair of side to side base beams  28  to the vertical frame rails  22  and  24  by way of welding, bolting or other securing method for providing sufficient structural integrity to cabinet  10 . Similarly, top portion “T” of cabinet  10  is constructed with securing together a pair of front to back top beams  30  and a pair of side to side top beams  32  to the front pair of vertical rails  22  and to the back pair of vertical frame rails  24  by way of bolting, welding or other securing method to provide sufficient structural integrity to cabinet  10  thereby completing formation of a generally rectangular box structure. In this particular embodiment, the cabinet is approximately 800 mm wide (31.5 inches), 1070 mm deep (42.2 inches) inches and approximately 84 inches tall and will carry a 2,000 pound load rating. 
     As can be seen in  FIG. 3 , front to back beams  26  positioned in the bottom portion “B” of cabinet  10  and front to back beams  30  positioned in top portion “T” of cabinet  10  each extend beyond pairs of vertical frame rails  22  and  24 . In this embodiment, cross beam  34  is connected to and spans ends of the front to back beams  26  that extend outwardly toward front portion “F” at bottom portion “B” of cabinet  10 . Similarly another cross beam  34  is connected to and spans the ends of the front to back beams  30  that extend outwardly toward front portion “F” at top portion “T” of cabinet  10 . These two cross beams  34  which are positioned in front portion “F” of cabinet  10  are utilized to carry and from which to hinge front door  12  to cabinet  10 . As seen in  FIG. 4 , a pair of cross beams  36  are one each positioned at the bottom portion “B” and top portion “T” of cabinet  10 . Cross beam  36  positioned at bottom portion “B” of cabinet  10  is connected to and span ends of front to back beams  26  and the other cross beam  36  of this pair is connected to and span the ends of front to back beams  30 , at rear portion “R” of cabinet  10 . Pair of cross beams  36  are utilized to carry and from which to hinge rear door  17  to rear portion “R” of cabinet  10 . 
     As is shown in  FIGS. 3 and 4 , front door  12  in  FIG. 3  is being opened from the right side of frame  16  of cabinet  10  and is hinged to frame  16  on the left side of frame  16  of cabinet  10 . As will be later described, front door  12  may be closed and secured to frame  16  and thereafter front door  12  may then be opened with door  12  hinged on the right side of frame  16  of cabinet  10  and the door opening from the left side of frame  16  of cabinet  10 , as seen in  FIG. 14 . Similarly, in the rear of cabinet  10  it is shown that rear door  17  is hinged on the left side of frame  16  and cabinet  10  and opens from the right side of frame  16  and cabinet  10 . Rear door  17  can be closed and reopened wherein rear door  17  is hinged on the right side of frame  16  of cabinet  10  and rear door  17  opens from the left side of frame  16  of cabinet  10 . 
     In this embodiment, frame  16  carries dual hinged front door  12  and dual hinged rear door  17 . Side panels (not shown) are also provided to enclose cabinet  10 . In this embodiment both front door  12  and rear door  17  are vented with a plurality of perforations or openings  19  positioned throughout (not shown) the central portion of outer surface or skin portion  21 . These perforations  19  allow the doors to dissipate heat generated by the electrical equipment positioned within cabinet  10 . Samples of such openings can be seen in later figures, for example, such as  FIGS. 22-23 . Similarly, side panels (not shown) can also be constructed with similar openings  19  to provide additional ventilation to cabinet  10 . Likewise, ventilation can be provided in a top (not shown) to cabinet  10  and through the bottom of cabinet  10 . 
     In referring to  FIG. 5 , the back or rear side of front door  12  is shown without being attached to frame  16 . The central portion of outer surface or skin portion  21  of front door  12 , as discussed above, can be perforated with openings  19  throughout the skin portion  21 . Front door  12 , in this embodiment, is reinforced with door cross beam members  38  positioned across a top and bottom portions of front door  12  to provide structural integrity to front door  12 . A portion of left handle assembly  18 ′ and a portion of right handle assembly  20 ′ are seen from the rear side or back side of front door  12 . Handle assemblies  18 ′ and  20 ′ will be discussed later in more detail. 
     A pair of locking rods  40  are connected to each handle assembly  18 ′ and  20 ′. From each assembly  18 ′ and  20 ′ a locking rod  40  extends toward the top of front door  12  and from each assembly  18 ′ and  20 ′ a locking rod  40  extends toward the bottom portion of front door  12 . As will be discussed in more detail later, a pair of locking rods  40  associated with each handle assembly will selectively move together between an extended position relative to the handle assembly to which it is associated and a retracted position. Since each locking rod  40  spans from a mid portion of front door  12  to either the top or to bottom portion of front door  12 , each locking rod  40  can be subjected to unwanted deflection with movement of the door which could result in locking rod shortening its span. A shortening of the span of locking rod  40  could remove locking rod  40  from a locked extended position to an unlocked position which could result in unintended disengagement or unlocking of locking rod  40 . Bracket  42  has been connected to the rear side of front door  12  for each of the four locking rods  40 , such that each bracket  42 , engages a locking rod  40  at a central portion of its span and thereby minimizes undesired flexing of locking rod  40  in operation of the door. In this example, bracket  42  defines an opening  44  in which locking rod  40  can be restrained from flexing. 
     Referring to  FIGS. 6-11 , an interlocking assembly  46  will be described herein, will prevent users of network cabinet  10  which have dual hinged doors, from accidentally unhinging both sides of a door which could cause either damage, injury or both. The interlocking assembly to be described herein is located on a bottom portion of front door  12 . The same interlocking assembly  46  is also positioned on the top portion of front door  12 . Since this embodiment includes both front door  12  and rear door  17  as dual hinged doors, the same interlocking assembly  46  structure described herein will also be found also in both the top and bottom portions of rear door  17 . 
     In referring to  FIG. 6 , interlocking assembly  46  includes first rotatable lower latch or first latch  48  positioned at a right side of front door  12  and second rotatable lower latch or second latch  50  positioned on the opposing left side of front door  12 . As will be described in more detail later on, these rotatable latches rotate between open and closed positions relative to door  12 . In looking at  FIG. 3 , the positions of latches  48  and  50  coincide with the position of front door  12  in  FIG. 3 . As can be seen in  FIG. 3 , the left side of front door  12  is hinged to frame  16 . Second lower latch or second latch  50  is in a closed position engaging second lower hinge pin or hinge pin  52  as seen in  FIGS. 6 ,  7 , and  20 . Second lower hinge pin  52 , as seen in  FIG. 15 , is connected to and extends in an upward direction from a bottom portion “B” of frame  16 , forming a hinge with second lower latch  50 , as seen in  FIGS. 6 ,  7  and  20 . On the right side of front door  12 , with that side of door  12  in an open position, first lower latch or first latch  48  has been rotated into an open or unhinged position, as seen in  FIGS. 6 and 9 . Without a hinge pin engaged within first lower latch  48 , the right side of the door  12  is permitted to be in an opened position relative to frame  16  of cabinet  10 . As will be described in more detail below, interlocking assembly  46  positioned at the top portion of front door  12  is constructed and operates in the same way as the interlocking assembly  46  positioned in a lower portion of door  12 . As a result, one side of door  12  will be either hinged or unhinged. 
     Further referring to  FIG. 3 , with the right side of front door  12  in an opened position, first lower latch  48  is in an open position relative to door  12 , as seen in  FIG. 9 , as well as, first upper latch  65  is positioned in the same open position in interlocking assembly  46  positioned in the top portion of door  12 . First upper latch  65  is positioned generally vertically and spaced apart above latch  48 . First upper latch  65  can be generally seen in  FIG. 17 , however, in this figure first upper latch  65  is in a closed position. First upper latch  65  will be in the same open configuration as first lower latch  48  as seen in  FIGS. 6 and 9  with door  12  opened on the fright side of frame  16 . On the other or left side of door  12 , second upper latch  67 , as seen in  FIG. 19 , which is part of interlocking assembly  46  positioned on the top portion of door and is positioned on the left side of door  12 . Second upper latch  67 , shown in  FIG. 20 , is positioned on the same side of front door  12  as second lower latch  50 . Both latches  50  and  67  have been rotated to a closed position relative to door  12  and form hinges with second lower hinge pin  52  and second upper hinge pin  53  respectively, as seen with door  12  in the hinged position shown in  FIG. 3 . 
     Since both front door  12  and rear door  17 , in this embodiment, are both dual hinged doors that will have interlocking assemblies  46  positioned on both the top and bottom portions of each door, each door will have four latches, two on each the left and right sides of each door. As a result, both front portion “F” and rear portion “R” of frame  16 , will need four hinge pins connected to each of front portion “F” and rear portion “R” of frame  16  to correspond to the four latches on each door, thereby being able to secure with hinges the right and left side of each door to frame  16 . 
     For purposes of this description, the four hinge pins  51 ,  52 ,  53  and  57 , each is connected to front portion “F” of frame  16 . The same arrangement is provided for rear portion “R” of frame  16 . Second lower and second upper hinge pins  52  and  53 , as seen in  FIGS. 15 and 16  are connected to frame  16  on the left side portion of frame  16  and are in vertical alignment with one another. Second upper hinge pin  53  is positioned on top portion “T” of frame  16  and second lower hinge pin  52  is positioned on bottom portion “B” of frame  16 . The other two hinge pins, first lower hinge pin  57 , as seen in  FIG. 13 , and first upper hinge pin  51 , as seen in  FIG. 12 , are positioned on the right side portion of frame  16  and are vertically aligned with one another with first upper hinge pin  51  secured to top portion “T” and another hinge pin or first lower hinge pin  57  is secured on bottom portion “B” of frame  16 . 
     The hinge pins on the left side of frame  16  align and interact with the latches positioned on the left side of the door that are in interlocking assembly  46  positioned on the top and the bottom of door  12 . Hinge pins on the right side of frame  16  align and interact with the latches positioned on the right side of the door that are in interlocking assembly  46  positioned on the top and the bottom of door  12 . The hinge pins assist in moving the latches they engage from an open position to a closed position and from a closed position to an open position. This will be described in more detail below with respect to first lower latch  48  and second lower latch  50  and the same will apply to the other latch on the same side of the door, first upper latch  65  and second upper latch  67  respectively. It will be appreciated that the latches on one side of door  12  will be rotated between open and closed positions relative to the door by the hinge pins they align with and engage on that side of the door. With the latch rotated to a closed position, it forms a hinge with the pin it has engaged. Then with moving that side of the door away from frame  16 , as the door opens on that side hinge pins on that side of frame  16  urge latches on door  12  on that corresponding side to an open position. With returning that side of the door to a closed position, the latches engage the hinge pins and the hinge pins causes the latches to rotate to a closed position, again forming the hinges. This sequence of the operation of the hinges and pins work in the same way on both sides of the door. 
     In referring to interlocking assembly  46  seen in  FIGS. 6-11 , first latch or first lower latch  48  is secured to and rotatable relative to front door  12  between an open position shown in  FIG. 9 , and closed position, as seen in  FIG. 9C . First lower latch  48 , as seen in  FIGS. 9-9C  comprises base  54  with two spaced apart arms  55 ,  56  which extend from base  54  and define a space  58  positioned between arms  55 ,  56  for receiving a hinge pin or first lower hinge pin  57 , as seen in  FIG. 9B  which is aligned to engage first lower latch  48  with door  12  moved toward a closed position. In this embodiment, first latch  48  is secured to front door  12  with pin connector  49  that is affixed to front door  12 , such that first latch  48  is only movable relative to door  12  by rotation about pin connector  49 . As a result, pin connector  49  forms an axis of rotation for first latch  48  in a fixed location relative to door  12 , about which first latch  48  rotates between open and closed positions relative to door  12  as seen in  FIGS. 9 and 9C . 
     Cam arm  60  is affixed to first latch  48  and, in this example, is integrally formed with first latch  48  and extends from first latch  48 . A first portion  63  of first latch linkage arm  62  is rotatably connected to cam arm  60  with second pin connector  61 . First latch linkage arm  62  and cam arm  60  can rotate about an axis of rotation formed by second pin connector  61 . Since second pin connector  61  is not affixed to door  12 , the axis of rotation formed by second pin connector  61  is movable relative to front door  12 . The fixed axis of rotation of the first latch  48  and the movable axis of rotation between the cam arm  60  and first latch linkage arm  62  are spaced apart from one another. 
     Spaced apart from first portion  63  of first latch linkage arm  62  is second portion  64  of first latch linkage arm  62  is rotatably connected to first interference member  66  with third pin connector  68 , as seen in  FIGS. 6 ,  10  and  11 . Third pin connector  68  permits rotational movement between first latch linkage arm  62  and first interference member  66  and without third pin connector  68  being affixed to front door  12 , an axis of rotation formed by third pin connector  68  is movable relative to door  12 . First interference member  66  is rotatably secured to door  12  with a fourth pin connector  70  wherein the fourth pin connector  70  is affixed to door  12  permitting first interference member  66  to rotate about a fixed axis of rotation formed by the fourth pin connector  70 . The axis of rotation formed by the third pin connector  68  is positioned spaced apart from the axis of rotation of the fourth pin connector  70 . Thus, with first lower latch  48  positioned in an open position as seen in  FIG. 9 , cam arm  60  positions first latch linkage arm  62  in a retracted position such that first portion  63  positioned proximate to end portion “E” of door  12 . With first latch linkage arm  62  in the retracted position first interference member  66  is positioned in blocking relationship to a path of rotation of second interference member  72 , as seen in  FIG. 10  and which will be discussed in more detail herein. 
     With first lower latch  48  in an open position as seen in  FIG. 9  and first upper latch  65  is also in an open position, door  12  on the right side of frame  16  is in an open position. As door  12  is moved toward a closed position, as seen in  FIG. 9B , first lower latch  48  is moved toward first lower hinge pin  57  and lower hinge pin  57  is received in space  58  between arms  55  and  56  of first latch member  48 . As door  12  is further moved from the position shown in  FIG. 9B  to a closed position as seen in  FIG. 9C , arm  55  is pushed up against stationary first lower hinge pin  57  causing first latch  48  to rotate about pin connector  49  to a closed position in  FIG. 9C . With the rotation of first latch  48 , cam arm  60  rotates about pin connector  49  and pushes against first latch linkage arm  62  and moves first latch linkage arm  62  from the retracted position as seen in  FIG. 9B  to an extended position as seen in  FIG. 9C . The extended position of first latch linking arm  62  is a position relative to a retracted position, which is seen in  FIG. 9 . In the extended position first portion  63  is positioned further away from end portion “E” of door  12  than is the retracted position where first portion  63  is positioned closer to end portion “E”. Movement of first latch linkage arm  62  from the retracted position to the extended position rotates first interference member  66  from a blocking position with respect to second interference member  72 , as seen in  FIG. 10 , to a non-blocking relationship with the second interference member  72  as seen in  FIG. 11 . Thus, with first latch member  48  reaching a closed position and door  12  is closed, first and second interference members  66  and  72  which are positioned adjacent to one another and are positioned in non-blocking relationship with one another, as seen in  FIG. 11  with second lower latch  50  also in a closed position. This will be more fully discussed below. 
     With respect to opening door  12  from a closed position with first lower latch  48  in a closed position, as seen in  FIG. 9C , door  12  is urged away from frame  16  on the side of the door first lower latch  48  is located. With hinge pin  57  positioned in the path of movement of arm  56  of first latch  48  and as door  12  is urged to an open position, arm  56  and first latch  48  begin to rotate about pin connector  49  to an open position in  FIG. 9 . Cam arm  60  rotates about pin connector  49  moving first latch linkage arm  62  from an extended position in  FIG. 9C  to a retracted position as seen in  FIG. 9 . This movement of first latch linkage arm  62  results in rotation of first interference member  66  from a non-blocking relationship with respect to second interference member  72  as seen in  FIG. 11  to a blocking relationship with second interference member  72  as seen in  FIG. 10 . With door  12  moved to an open position, first latch  48  is in an open position as seen in  FIG. 9 . Thus, as door  12  moves back from this open position, seen in  FIG. 9 , to a closed position as seen in  FIG. 9C , first lower latch  48  is pushed by hinge pin  57  and moves latch  48  from an open to a closed position resulting in first interference member  66  rotating from a blocking relationship, as seen in  FIG. 10 , to a non-blocking relationship with respect to second interference member  72  as seen in  FIG. 11 . 
     Because the interlocking assembly  46  positioned at the top portion of door  12  is the same as that described above for the interlocking assembly positioned on the lower portion of door  12 , corresponding first upper latch  65  interacts with first upper pin  61  in the interlocking assembly  46  positioned at the top portion of door  12  in the same way as the above described first lower latch  48  interacts with first lower hinge pin  57 . The result in the upper interlocking assembly  46  is also the same as the lower interlocking assembly  46  with the positioning a first interference member in blocking and non-blocking relationship with respect to the second interference member. 
     On the second or opposite side of door  12  from first lower latch  48 , in this instance, the left side of front door  12 , interlocking assembly  46  is structured the same as the right side of interlocking assembly that has been described above. In referring to interlocking assembly  46  shown in  FIGS. 6 ,  7  and  8 , second lower latch  50  is secured to and rotatable relative to front door  12  between a closed position as shown in  FIG. 7  and an open position as does first lower latch  48 , seen in  FIG. 9 , relative to door  12 . Second lower latch  50  comprises base  154  with two spaced apart arms  155 ,  156  which extend from base  154  and define a space  158  positioned between arms  155 ,  156  for receiving other hinge pin  52  connected to frame  16 . In this embodiment, second latch  50  is secured to front door  12  with pin connector  149  that is affixed to front door  12 , such that second latch  50  is only movable by rotation about pin connector  149 . As a result, pin connector  149  forms an axis of rotation for second latch  50  in a fixed location relative to door  12 . 
     Second cam arm  160  is affixed to second latch  50  and, in this example, is integrally formed with second latch  50  and extends from second latch  50 . A first portion  163  of second latch linkage arm  162  is rotatably connected to second cam arm  160  with second pin connector  161 . Second latch linkage arm  162  and second cam arm  60  can rotate about an axis of rotation formed by second pin connector  161 . Since second pin connector  161  is not affixed to door  12 , the axis of rotation formed by second pin connector  161  is movable relative to front door  12 . The fixed axis of rotation of the second latch  50  and the movable axis of rotation between the second cam arm  60  and second latch linkage arm  62  are spaced apart from one another. 
     Spaced apart from first portion  163  of second latch linkage arm  162  is second portion  164  is rotatably connected to second interference member  166  with third pin connector  168 , as seen in  FIGS. 6 ,  7  and  8 . Third pin connector  168  permits rotational movement between second latch linkage arm  162  and second interference member  72  and without third pin connector  168  being affixed to front door  12 , an axis of rotation formed by third pin connector  168  is movable relative to door  12 . Second interference member  72  is rotatably secured to door  12  with a fourth pin connector  170  wherein the fourth pin connector  170  is affixed to door  12  permitting second interference member  72  to rotate about a fixed axis of rotation formed by the fourth pin connector  170 . The axis of rotation formed by the third pin connector  168  is positioned spaced apart from the axis of rotation of the fourth pin connector  170 . Thus, with second lower latch  50  positioned in a closed position as seen in  FIGS. 7 and 8 , second cam arm  158  positions second linkage arm  162  in an extended position as seen in  FIGS. 6-8 , such that second linkage arm  162  positions second interference member  72  in a non-blocking relationship with respect to first interference member  66 , as seen in  FIG. 11 . It should be understood that the structure of interlocking assembly  46  positioned on the top portion of door  12  in the same left side of door  12  as second lower latch  50 , includes second upper latch  67  and second upper hinge pin  53  and is structured and operates the same as the interlocking assembly  46  as described for second lower latch  50  and second lower hinge pin  52 . 
     When a user chooses to open door  12  from the side of door  12  wherein second lower latch  50  is positioned, second lower latch  50  starts in a closed position as seen in  FIG. 7 . With the door moved to an open position, as seen in  FIG. 14 . So long as first lower latch  48  is in a closed position as shown in  FIG. 9C , door  12  from the side in which second lower latch  50  is positioned, can be pulled away from frame  16 . With first lower latch  48  in a closed position, first interference member  66  is in a non-blocking position, out of path of rotation of second interference member  72 , as seen in  FIG. 11 . Thus, the left side of door  12  can be urged away from frame  16  causing arm  156  to be pushed by hinge pin  52  rotating second lower latch  50  about pin connector  149 . Rotation of second latch  50  causes second cam arm  160  to rotate about pin connector  149  thereby moving into an open position and moving second latch linkage arm  162  from its extended position as seen in  FIG. 7  to a retracted position similar to a retracted position of first latch linkage arm  62  as seen in  FIG. 9 . With first interference member  66  positioned outside the path of rotation and in a non-blocking relationship with second interference member  72  as seen in  FIG. 11 , movement of second latch arm  162  to a retracted position with second lower latch  50  moving to an open position, second interference member  72  is rotated to into a blocking relationship with first interference member  66  (not shown). Thus, with second interference member  72  rotated toward first interference member  66 , first interference member  66  is blocked from being able to rotate toward second interference member  72 . Without interference member  66  being able to rotate toward second interference member  72 , first lower latch  48  will not be able to be moved to an open position. Such arrangement prevents accidental opening of first latch  48  with second latch  50  now in an open position. 
     As discussed earlier, with first lower latch  48  in an open position as seen in  FIG. 9  and second lower latch  50  positioned in a closed position as seen in  FIG. 7 , first interference member  66  is positioned in the path of rotation or blocking relationship with second interference member  72 , as seen in  FIG. 10 . With first interference member  66  in blocking relationship to rotation of second interference member  72 , and in this embodiment abutting second interference member  72 , second interference member  72  is not permitted to rotate as would otherwise be required with opening of second latch  50 . Thus, second lower latch  50 , as seen in  FIG. 7 , cannot be opened with first lower latch  48  already in an open position, as seen in  FIG. 9 . Thus, the opposite orientation of latches  48  and  50  wherein second latch  50  is in an open position, second interference member  72  is then positioned in the path of rotation of first interference member  66 . Thus with second lower latch  50  in an open position, first lower latch  48  cannot be moved from a closed position, as seen in  FIG. 9C , to an open position as seen in FIG.  9  which would otherwise require first interference member  66  to rotate toward second interference member  72 . As can be appreciated, interlocking assembly  46  permits only latches positioned on one side of door  12  to be opened at a time and will not permit latches to be opened on opposing left and right sides of door  12  at the same time. An override is provided should a door need to be completely removed. Handle  74  and  174  which are connected to first and second latch linkage arms  62  and  162  respectively, as seen in  FIGS. 9A and 8  respectively. The user can be grasp handle  74  and urge first lower latch to an open position and could grasp handle  174  and urge second lower latch  50  to an open position. 
     In referring to  FIGS. 10 and 11 , in this embodiment, first interference member  66  comprises convex surface  76  and second interference member  72  comprises concave surface  78 . With first interference member  66  positioned in a path of rotation of second interference member  72 , as seen in  FIG. 10 , convex surface  76  is positioned within concave surface  78 . This configuration in this embodiment places first interference member  66  in abutting relationship with second interference member  72 . This arrangement permits first interference member  66  to move smoothly in relationship to second interference member  72  and provide a secure blocking position with respect to second interference member  72  without permitting undesired movement of second interference member  72  with first interference member  66  in blocking position. Similarly, second interference member  72  comprises convex surface  80  and first interference member  66  comprises concave surface  82  such that convex surface  80  is positioned within concave surface  82  with second interference member positioned within the path of rotation of the first interference member  66 . This arrangement of this embodiment also places second interference member in abutting relationship with respect to first interference member  66  with second interference member  72  in blocking relationship to first interference member  66 . Second interference member  72  positioned in blocking relationship with first interference member  66  is not shown, however, that configuration is well understood in referring to  FIG. 10  wherein the opposite orientation is shown with first interference member  66  is in blocking relationship to second interference member  72 . This arrangement permits second interference member  72  to move smoothly in relationship to first interference member  66  and provide a secure blocking position with respect to first interference member  66  without permitting undesired movement of first interference member  66  with second interference member  72  in blocking position. 
     In referring to  FIGS. 6-9C , push rod  84  urges latches in interlocking assembly  46 . Push rod  84  will urge a latch in a direction to maintain the latch in an open position, with the latch being in an open position and in another direction to maintain the latch in a closed position with the latch positioned in a closed position. Push rod  84  is constructed in the same way with each latch and for purposes of describing push rod  84  herein, push rod associated with first lower latch  48  will be described. 
     Push rod  84  comprises rod member  86  that is rotatably mounted to door  12 . In this embodiment, rod member  86  is rotatably connected to second pin connector  61  wherein push rod  84  and cam arm  60  are in rotational relationship about second pin connector  61 . Spaced apart from this rotation connection  61  push rod  84  is mounted to door  12  for rotational and translational movement relative to door  12 . Pin  88  is affixed to door  12  and is positioned within slot  90  defined in rod member  86  such that push rod  84  is rotatable around pin  88  and push rod is movable in a linear direction relative to pin  88  with pin  88  moveable within slot  90 . 
     Push rod  84  further comprises spring  92  positioned along rod member  86  such that one end  94  abuts pin  88  and opposing end  96  abuts collar member  98  positioned on rod member  86 . Spring  92  is positioned between one end  94  and opposing end  96  such that spring  92  maintains a compression position as the cam arm  60  rotates with first lower latch  48  between open and closed positions, as seen in  FIGS. 9-9C . With the first lower latch member  48  in an opened position, a seen in  FIG. 9 , push rod  84  exerts a force in a first direction “D1” on cam arm  60  maintaining first latch  48  in an open position, as seen in  FIG. 9 . In this configuration, pin  88  is positioned in a back portion  100  of slot  90 , spring  92  is still in compression and first latch linkage arm  62  positions first interference member  66  in the path of rotation of second interference member  72 . With arm  55  of first lower latch member  48  engaging hinge pin  57 , as seen in  FIG. 9B , first latch  48  rotates to a closed position as door  12  is urged to a closed position, as seen in  FIG. 9C . With first lower latch  48  positioned in a closed position as seen in  FIG. 9C , push rod  84  exerts a force on the cam arm  60  in a second direction “D2” maintaining the first lower latch  48  in the closed position and maintains first interference member  66  in a position out of the path of rotation of second interference member  72 , as seen in  FIG. 11 . In this configuration, pin  88  is positioned in a forward position  102  in slot  90  as seen in  FIG. 9C  and spring  92  is still in a compression configuration. 
     Now in referring to  FIGS. 12-30 , an assembly for lifting and supporting a network cabinet door is shown. This assembly may be used with a single hinged door and as described in the embodiment herein, it will be applied to a double hinged door as well. Network cabinet  10  as seen in  FIGS. 1-4 , include dual hinged doors  12  and  17  as described earlier. Front door  12  will be referred to for purposes of this description, however, the same will apply to dual hinged rear door  17  as well. Door  12  because of its weight, size and at times fabrication tolerances in hinges that support door  12 , door  12  can sag with door  12  in an open position. In this instance door  12  can be opened from a right side and hinged on the left side as seen in  FIG. 3  and can be opened from the left side and hinged on the right side as seen in  FIG. 14 . 
     With door  12  in an open position, door  12  will be supported on only one side of door  12  and will be subjected to sagging. With door  12  in a sagging position, the user at times will be required to lift door  12  relative to frame  16  in order to properly align latches and corresponding hinge pins on the open side of the door so as to close the door properly. 
     Door lifting assembly  200 , is shown in  FIGS. 21-25 , which provides the user assistance to automatically realign the door from a sagging position, as door  12  is moved from an open position to a closed position. Door lifting assembly  200  provides an effortless unobstructed closing of door  12 . Door lifting assembly  200  will operate regardless which side of the door is hinged when the door is being closed. 
     Door support structure  202 , as seen in  FIGS. 26-30 , is provided to operate with each of first lower hinge pin  57  and second lower hinge pin  52 , which are both positioned on the bottom portion “B” of frame  16 . Door support structure  202  with the door in an open position supports door  12  proximate to a lower hinge with door  12 . Door support structure  202  will support door  12  at or near the elevation attained of door  12  by door lifting assembly  200  when the door was in a closed position. Thus, with use of support structure  202 , a reduction of up and down movement of door  12  can be provided as door  12  moves between open and closed positions. 
     In referring to  FIG. 12  an example of first upper hinge pin  51  is shown connected to top portion “T” of frame  16  of network cabinet  10  and on the right side portion of frame  16 . Hinge pin  51  is connected to bracket  204  by using a bolt, rivet or other common securing means and bracket  204  is in turn bolted to cross beam  34  of frame  16 . Spaced apart from and positioned directly below first upper hinge pin  51  is first lower hinge pin  57 , shown in  FIG. 13 . First lower hinge pin  57  is connected to bottom portion “B” and right side portion of frame  16  on cross beam  34 . First lower hinge pin is bolted to mounting bracket  206  and in turn mounting bracket  206  is bolted to cross beam  34 . 
     In referring to  FIG. 14 , door  12  is hinged on the right side of frame  16  to hinge pins  51  and  57  with door  12  in an open position on the left side of frame  16 . First upper hinge pin  51  and first lower hinge pin  57  are engaged with first upper latch  65  and first lower latch  48 , respectively, forming a first upper hinge  208 , in  FIG. 17 , and a first lower hinge  210 , in  FIG. 18 . 
     Referring to  FIGS. 15 and 16 , second lower hinge pin  52  and second upper hinge pin  53  are both not hinged to door  12 , with door  12  open on the left side of frame  16  and door  12  hinged on the right side of frame  16 , as shown in  FIG. 14 . Second lower hinge pin  52 , in  FIG. 15 , is connected to a bottom portion “B” of frame  16  of network cabinet  10  with second lower hinge pin  52  bolted to mounting bracket  206  and mounting bracket  206  in turn bolted to cross beam  34  of frame  16 . In this example, second lower hinge  52  is positioned on the left portion of frame  16 . Second upper hinge pin  53  is shown in  FIG. 16  connected to top bottom portion “T” and on a left side portion of frame  16 . Second upper hinge pin  53  is positioned spaced apart and directly above second lower hinge pin  52 . Second upper hinge pin  53  is connected to cross beam  34  with hinge pin  53  bolted, riveted or otherwise secured to mounting bracket  204  and mounting bracket  201  in turn is bolted to cross beam  34 . 
     In referring to  FIGS. 19 and 20 , door  12  is hinged on the left side of frame  16  as shown in  FIG. 3  and opened on the right side of frame  16 . Second upper hinge pin  53  as shown in  FIG. 19  is engaged with closed first upper latch  67  forming second upper hinge  212 . Second lower hinge pin  52  is engaged with closed second lower latch  50  forming second lower hinge  214 . 
     The assembly for lifting and supporting a door relative to the cabinet, as mentioned earlier, can be applied to operate with a door that opens and closes on one side, however, for the present embodiment the assembly will be applied to dual hinged door  12 . With respect to dual hinged doors  12 , the dual hinged operation performs with latches on the right side of door  12  operating between open and closed positions with respect to the hinge pins on the right side of frame  16  and likewise the latches on the left side of door  12  operate between open and closed positions with respect to the hinge pins on the left side of frame  16 . 
     In addressing the operation of the latches and hinge pins that operate on the right side of cabinet  10 , first upper latch  65 , as describe earlier, is rotatably connected to door  12  in interlocking assembly  46  so as to rotate between an open and closed position relative to door  12 , as seen for example in  FIGS. 9-9C , and is positioned in the upper right portion of door  12 . With first upper latch  65  in a closed position, as seen for example in  FIG. 9C , latch  65  forms first upper hinge  208 , as seen in  FIG. 17 . In an open position first upper hinge  65 , as seen, for example, in  FIG. 9 , is positioned out of blocking relationship with first upper hinge pin  51  as seen in  FIG. 12  such that hinge pin  51  and latch  65  are permitted to separate from one another and move the door to an open position as seen in  FIG. 3 . Similarly the other latch on the right side of door  12 , first lower latch  48 , operates in the same way. First lower latch  48  is rotatably connected to door  12  in interlocking assembly  46  so as to rotate between an open and closed position as seen in  FIGS. 9-9C . and is positioned in the lower right portion of door  12 . With first lower latch  48  in a closed position, as seen in  FIG. 9C , latch  48  forms first lower hinge  210 , as seen in  FIG. 18 . In an open position first lower hinge  48 , as seen in  FIG. 9 , is positioned out of blocking relationship with first lower hinge pin  57  as seen in  FIG. 13  such that hinge pin  57  and latch  48  are permitted to separate from one another and move the door to an open position as seen in  FIG. 3 . This configuration permits, the right side of door  12  to move between open and closed positions. 
     Now with respect to the left side of frame  16  and the left side of door  12 , second upper hinge pin  53  as described earlier is connected to a top portion “T” and left side of frame  16  spaced apart from and across frame  16  from first upper hinge pin  51 . Second lower hinge pin  52  is connected to the bottom portion “B” of frame  16  and is spaced apart from and across frame  16  from first lower hinge pin  57 . Second upper latch  67 , as describe earlier, is rotatably connected to door  12  in interlocking assembly  46  so as to rotate between an open and closed position relative to door  12 , as seen for example in  FIGS. 9-9C , and is positioned in the upper left portion of door  12 . With second upper latch  67  in a closed position, as seen for example in  FIG. 7 , latch  67  forms second upper hinge  212 , as seen in  FIG. 19 . In an open position, first upper hinge  67 , as seen, for example, in  FIG. 9 , is positioned out of blocking relationship with first upper hinge pin  53  as seen in  FIG. 16  such that hinge pin  53  and latch  67  are permitted to separate from one another and move the door to an open position, as seen in  FIG. 14 . Similarly the other latch on the left side of door  12  is second lower latch  50 . Second lower latch  50  is rotatably connected to door  12  in interlocking assembly  46  so as to rotate between an open and closed position as seen in  FIG. 7 , and by way of example in  FIGS. 9-9C . and is positioned in the lower left portion of door  12 . With first lower latch  50  in a closed position, as seen in  FIG. 7 , latch  50  forms second lower hinge  214 , as seen in  FIG. 20 . In an open position second lower hinge  50 , as seen for example in  FIG. 9 , is positioned out of blocking relationship with second lower hinge pin  52  as seen in  FIG. 15  such that hinge pin  52  and latch  50  are permitted to separate from one another and the door can be moved to an open position as seen in  FIG. 14 . 
     With respect to lift pin assembly  200 , shown in  FIGS. 24 and 25 , this is a portion of the assembly for lifting and supporting a door relative to cabinet  10 . In referring to  FIGS. 14 and 21 , lift pin  216  is connected to front door  12 . Lift pin  216  extends in a direction forming an angular relationship with a plane formed by door  12 . This angular relationship with door  12  is the same regardless of which side of door  12  is hinged and with the door is in an open position. 
     In  FIG. 14 , front door  12  is hinged on the right side of frame  16  and door  12  is open on the left side of frame  16 . In this instance, door  12  is hinged about first lower hinge pin  57 , as shown in  FIG. 18 , and about first upper hinge pin  51 , as shown in  FIG. 17 . In  FIG. 21 , front door  12  is hinged on the left side of frame  16 , as shown in  FIG. 3 , and is opened on the right side of frame  16 . In this instance, door  12  is hinged about second upper hinge pin  53 , as shown in  FIG. 19 , and about second lower hinge pin  52 , as shown in  FIG. 20 . In either orientation of door  12  opened and hinged from either the right or left side of frame  16 , lift pin  216  is positioned in the angular position relative to the plane of door  12  and operates in the same way. Thus, the operation of lift pin  216  will apply to door  12  regardless from which side of frame  16  it is hinged. 
     Lift pin  216  is rotatably mounted to axle  218  as seen in  FIGS. 23-25 . Axle  218  is secured to door  12  by being rotatably mounted to bracket  220  and bracket  220  being connected to door  12  with bolts or any other conventional method. With lift pin  218  positioned, in this embodiment, in a central portion of axle  218 , bushing  222  is positioned on axle  218  and is positioned between lift pin  216  and bracket  220 , as seen in  FIG. 23 . On the other side of lift pin  216 , torsion spring  224  is positioned between lift pin  216  and bracket  220 . One end of torsion spring  224  is connected to lift pin  216  and the other end of torsion spring  224  is connected to bracket  220 . Bracket  220  in turn is connected to door  12 . 
     Torsion spring  224  is positioned to exert an upward force on lift pin  216 . Restraint member  226  which is connected to bracket  220  and is in turn connected to door  12 , is positioned in a path of upward rotation of lift pin  216 , as seen in  FIG. 22 . Restraint member  226  is positioned such that torsion spring  224  retains stored energy and continues to urge lift pin  216  against restraint member  226 . 
     As door  12  is moved from an open position toward a closed position relative to frame  16 , lift pin  216 , as seen in  FIG. 24 , engages lift pin support member  228 . Lift pin support member  228  is connected to cross beam  34 . In this example, frame  16  is constructed to angle in an upward direction as it approaches cross beam  34 . Member  228  is bolted or otherwise secured to frame  16  and is positioned at a predetermined elevation to elevate door  12  to a desired elevation with lift pin  216  fully engaged, as seen in  FIG. 25 . Thus, as lift pin engages support member  228  and door  12  continues to move toward a closed position, lift pin  216  rotates in a downward direction relative to door  12 , to a more vertical position as door  12  attains a closed position, as seen in  FIG. 25 . With door  12  in the closed position, lift pin  216  extends in a direction, in this embodiment, generally aligned with the plane formed by door  12 . Also, with door  12  in a closed position, as shown in  FIG. 25 , door  12  has been lifted to a predetermined desired elevation relative to frame  16  to permit smooth closure of door  12  with door latches and corresponding hinge pins aligned. 
     In referring to  FIG. 25 , door  12  is in a closed position and lift pin  216  has rotated and is supported by support member  228 . Distance “d” shown in  FIG. 25  is the distance door  12  has elevated from an open position to a closed position. Line  230  represents a position of a distal end of phantom lift pin  216 ′ with door  12  in an open and sagging position and other line  232  represents an elevation of the distal end of lift pin  216  with door  12  in an elevated position with door  12  in a closed position. The distance “d” between line  230  and other line  232  demarks the distance door  12  was raised in an upward direction or elevated relative to frame  16  to a desired predetermined elevation in the process of closing door  12 . 
     With door  12  in a completely closed position, with both right and left sides of door  12  hinged to frame  16 , lift pin  216  has elevated door  12  to the desired elevation for provide smooth operation of the door by the user. Thus, with door  12  in the closed position lift pin support member  228  can maintain door  12  at or near the desired elevation. When door  12  is then thereafter placed in an open position, wherein only one side of door  12  is hinged to frame  16 , door support structure  202  is utilized to support door  12  at or near the desired predetermine elevation door  12  was positioned by lift pin  216  with door in a closed position. 
     In referring to door support structure  202 , two embodiments will be discussed herein and are shown in  FIGS. 26-30 . Door support structure  202  will provide support to door  12  at a location proximate to the lower hinge pin about which door  12  is hinged, with the door in an open position. Door support structure  202  will support door  12  at or near the elevation door  12  attained by the operation of lift pin  216  with door  12  placed into a closed position. 
     For example, with respect to door  12  being hinged about first lower hinge pin  57  and first upper hinge pin  51 , as seen in  FIG. 14 , first embodiment  234  of door support structure  202  is shown in  FIGS. 26 and 27 . First embodiment  234  of door support structure  234  comprises nut member  236  that is threaded (not shown) and engages compatible threads  238  defined by first lower hinge pin  57 . Nut member  236  is adjustable in elevation relative to hinge pin  57 . Nut member  236  extends away from a longitudinal axis  240  and in angular relationship with longitudinal axis  240 . In this embodiment, the angular relationship is generally perpendicular to longitudinal axis  240 . 
     First lower hinge pin  57  is secured to mounting bracket  242  with bolt  244  and in turn bracket  242  is bolted to cross beam  34  of frame  16 . Thus, as door  12  is placed into a closed position, as seen in  FIG. 27 , nut member  236  is adjusted by the user. The user turns nut member  236  and adjusts the elevation of nut member  236  along hinge pin  57  to abut a lower portion of door  12 . With door  12  in a closed position, door  12  has been positioned into its desired predetermined elevation with lift pin  216 . With positioning or adjusting nut member  236  to abut the lower portion of door  12  and then with door  12  then opened from an opposing side of frame  12  from hinge pin  57  with door  12  hinged about hinge pin  57 , nut member  236  will support door  12  at or near the desired elevation attained when door  12  had been placed in a closed position. 
     This same construction for the above first embodiment  234  of door support structure  202  can be applied in association with second lower hinge pin  52  on the other side of frame  16 . This will be understood to be the second door support structure. With door  12  placed in a closed position, nut member  236  can also be adjusted to abut the lower portion of door  12 . The result would also be that with door  12  hinged about second lower hinge pin  52  and door  12  opened from the opposite side of frame  16 , door  12  will be supported at or near the desired elevation attained by lifting pin  216  when door  12  was in the closed position. 
     A second embodiment  235  of door support structure  202  is shown in  FIGS. 28-30 . In referring to  FIG. 28 , first lower hinge pin  57  is shown engaged with closed first lower latch  48  with second embodiment  235  supporting door  12  with door  12  in a closed position. In this configuration, door  12  is hinged to first lower hinge pin  57  and door  12  is opened on the opposing side of door  12  from latch  48 . In this instance, second lower latch  50  and corresponding second upper latch  65  are open. 
     For purposes of this description of second embodiment  235  of door support structure  202 , the same structure is positioned and associated with second lower hinge pin  52  and is known as second door support structure. Thus, the description of door support structure  202  associated with first lower hinge pin  57  will provide the description of the same second door support structure associated with second lower hinge pin  52 . 
     In  FIGS. 28-30 , first lower hinge pin  57  connected to cross beam  34  of frame  16 . Hinge pin  57  is bolted to bracket  246  and bracket  246 , in turn, is bolted to cross beam  34  with bolt  248 . Hinge pin lower segment  250  defines opening  252  through which bolt  248  passes. On an upper portion of segment  250  are defined threads  253  which engage and are compatible to threads  255  defined within hinge pin  52  such that lower segment  250  and hinge pin  57  are threadingly secured together. 
     At least two annular door support members  254 , wherein each define an opening  246 , are stacked onto hinge pin  52  with hinge pin  52  passing through openings  246 . As seen in  FIG. 30 , annular members  254  are stacked on top of one another. Each annular member  254  extends away from longitudinal axis  240  of hinge pin  57  in an angular relationship. The angular relationship is generally perpendicular to longitudinal axis  240 . With annular members  254  configured to have a narrower construction in their thickness on the peripheral outside portion  256  of each annular member  254 , two adjacent annular members  254  define a first space  258  positioned between each adjacent annular members  254 . With three annular members  254  stacked, two successive spaces  258  and  259  are defined, wherein each space is positioned at different elevations relative to frame  16 . 
     As seen in  FIG. 30 , with door  12  moved to a closed position, an edge  260  of door  12  enters a space positioned between two adjacent annular members  254 . Thus, with door  12  positioned in a desired predetermined elevation attained with lift pin  216  with door  12  in a closed position, door  12  is supported by an annular disk member  254  at or near the desired predetermined elevation attained by lift pin  216 . Thus when door  12  is reopened, in this example, with hinge formed around hinge pin  52  positioned on the other side of frame  12 , door  12  is supported by annular member  254  which is positioned immediately below door  12 , as seen in  FIG. 30 . 
     As mentioned earlier, this same door support structure is positioned at both lower hinge pins  52  and will operate in the same way as door support structure associated with first lower hinge pin  57  described above. Thus, moving door  12  open from either the right or left side of door  12  will result, in door  12  supported at or near the desired predetermined elevation attained by lift pin  216  when door  12  was closed. 
     In referring to  FIGS. 31-40 , handle assembly  300  is shown. Handle assembly  300  in this embodiment is used to operate handles  18  and  20  that are positioned on each dual hinged door  12  and  17 . Handle assembly  18 ′, for handle  18  positioned on the left side of door  12 , as seen in  FIGS. 1-3 , Likewise handle  18  will be positioned on the left hand portion of rear door  17 , from a frame of reference of facing door  17 , as seen in  FIG. 4 . Handle assembly  20 ′ which includes handle  20  positioned on the right side of door  12 , as seen in  FIGS. 1-3 , is also positioned on the right hand portion of rear door  17 , frame a frame of reference of facing door  17 , as seen in  FIG. 4 . 
     In this embodiment, handle  18  will rotate in a clockwise direction to open doors  12  and  17  and handle  20  will rotate in a counterclockwise direction to open doors  12  and  17 . Right handle assembly  20 ′ will be described herein below with reference to front door  12  and such will apply to right handle assembly  20 ′ positioned on rear door  17 . It should be noted left hand handle assembly  18 ′ is shown in  FIGS. 39 and 40  and will operate in generally the same way as right handle assembly  20 ′, except that the arrangement of parts within handle assembly  18 ′ will be adjusted to accommodate rotating handle  18  in a clockwise direction to open the left hand side of door  12  and left hand side of door  17 , from a frame of reference of facing door  17 . The variation in arrangement or positioning of parts within left handle assembly  18 ′ will be set forth in the description of  FIGS. 39 and 40 . 
     Right handle assembly  20 ′ is the same for both front and rear doors  12  and  17 . As earlier mentioned, pair of locking rods  40 , as seen in phantom in  FIGS. 31 ,  35  and  37 , are associated with (right) handle assembly  20 ′ as they are with (left) handle assembly  18 ′, as seen in  FIGS. 39 and 40 . Locking rods  40 , are used to lock and unlock latches positioned on the same side of the door as the handle is positioned. Locking rods  40  will be in an extended position with latches closed and in a retracted position with latches open. 
     Locking rods  40 , as seen in  FIG. 31 , with handle assembly  300  positioned in a first closed position and handle  20  positioned in a first position, are in an extended position extending toward the top and bottom of door  12 . In the extended position, as will be discussed below, locking rods  40  lock latches,  65  and  48 , as seen in  FIGS. 17 and 18 , in a closed position with both latches being positioned on the right side portion of door  12 . 
     Pair of locking rods  40  are secured to cam  350 , as seen in  FIGS. 31 and 34  one is positioned on one side of axis of rotation  314  and another is positioned on an opposing side of axis of rotation  314 . Each locking rod  40 , is positioned in an extended position relative to handle  20  with handle  20  in the first closed positioned shown in  FIG. 31 , which will be discussed in further detail below. Locking rods  40  will be positioned in a retracted position relative to handle  20  with handle  20  in a second position, shown in  FIGS. 35 and 36 . 
     As seen in  FIGS. 35 and 36 , handle assembly  20 ′ is positioned in an open position, with handle  20  in a second position. Locking rods  40  are in a retracted position in relationship to the top and bottom of door  12  and with respect to handle  20 , as mentioned above. In the retracted position, locking rods  40  unlock latches  48  and  65 , as seen in  FIGS. 26 and 27 . With latches in an open position and being both on the right side portion of door  12 , door  12  can now be opened from that right side of the door  12 . 
     As seen in  FIGS. 37 and 38 , handle assembly  20 ′ is positioned in a second closed position, and locking rods  40  are in a retracted position in relationship to the top and bottom of door  12  and with respect to handle  20 . In this retracted position, each of the locking rods  40  are positioned abutting bearing plate  302  as seen in  FIGS. 26 and 27 , with handle  20  moved back to its first position. As will be described in more detail below, with handle assembly  20 ′ in this second closed position, locking rods  40  are urged with a spring within assembly  20 ′ to move locking rods  40  toward an extended and locked position and will do so automatically when the corresponding latches  67  and  48  are moved back to a closed position, as seen in  FIGS. 17 and 18 . 
     Thus, with door  12  in a closed position, locking rods  40  associated with handle assembly  20 ′ are in locking relationship with first upper latch  65  and first lower latch  48 , as seen in  FIGS. 17 and 18 . At the same time locking rods  40  associated with handle assembly  18 ′ will be in locking relationship with respect to second upper latch  67  and second lower latch  50 , as seen in  FIGS. 19 and 20 . 
     Referring to  FIGS. 26 and 27 , locking rod  40  is not in a locking relationship with latch  48 , however, this view will provide a further understanding of the working relationship between locking rod  40  with latch  48 . Locking rod  40  extends through door cross beam  38  and is restricted to typically to movement in an upward and downward directions. A bottom portion of locking rod  40  includes a beveled lead edge  302 . Bearing plate  306  is affixed to first latch linkage arm  62  by bolting, welding or other conventional means for securement. Bearing plate  306 , in this embodiment, is rotatably secured to first connector  61  and will rotate and linearly move with pin connector  61 . 
     Bearing plate  306  defines an opening  308  which is in registration alignment with an opening  310  defined in first latch linkage arm  62 . In  FIG. 26 , locking rod  40  is in a retracted position and is positioned directly above bearing plate  306  with latch  48  in an opened position. With latch  48  in an open position, pin connector  61  has been moved by cam  60  such that first latch linkage arm  62  has been positioned in the retracted position, as seen in  FIG. 9 . With linkage arm  62  in the retracted position, openings  308  and  310  are not positioned in alignment with locking rod  40 , as seen In  FIG. 26 . As latch  48  is rotated to a closed position, as seen in  FIG. 9C , first latch linkage arm  62  is moved to the extended position, as seen in  FIG. 9C , and openings  308  and  310  are moved to align with locking rod  40 . With openings  308  and  310  in alignment with locking rod  40 , locking rod  40  can be extended through openings  308  and  310 , as seen in  FIG. 18  and as seen in  FIG. 9C . As will be discussed below, with handle  20  moved to a second closed position, as seen in  FIGS. 37 and 38 , with door  12  still in an open position, openings  308  and  310  are still not aligned with locking rod  40 . Locking rod  40  will be automatically inserted into an extended position into openings  308  and  310  with a spring associated with handle assembly  20 ′. This will occur when door  12  and latch  48  reach a closed position thereby bringing openings  308  and  310  into alignment with locking rod  40 . With locking rod  40  extending through openings  308  and  310 , first latch linkage  62  is blocked from being able to move. Without linkage  62  being able to move, latch  48  cannot rotate and therefore latch  48  is locked in a closed position. 
     With door  12  in an open position as in  FIG. 26 , it can be further appreciated with this arrangement that as latch  48  moves toward a closed position, as seen in  FIGS. 9 through 9C , openings  308  and  310  are moved closer to aligning with locking rod  40 . As openings  308 ,  310  approach locking rod  40 , beveled edge  302  engages an edge of opening  308  and locking rod  40  begins to and is able to slide smoothly into both openings  308  and  310  until it reaches a fully engaged position as seen in  FIG. 17 . Bumper  304  is sized to snuggly fit the internal dimensions of openings  308  and  310  and provide a snug fit between the locking rod  40  and bearing plate  306  and first latch linkage min  62 . This snug fit prevents undesired movement of locking rod  40  within openings  308  and  310 . Typically, bumper  304  is constructed of an elastomeric material. 
     With the removal of locking rod  40  from openings  308  and  310 , as seen with moving handle  20  to a second position in  FIGS. 35 and 36 , latch  48  can now be rotated by pulling that side of the door away from frame  16  causing latch  48  to push against hinge pin  57  rotating latch  48  to an open position as seen in  FIGS. 9 and 26 . With locking rod  40  retracted out of openings  308  and  310 , latch  48  is free to move linkage arm  62  to a retracted position as seen in  FIG. 9  and  FIG. 26  and thereby move openings  308  and  310  away from and out of alignment with locking rod  40 . Door  12  is now in condition to be opened on from the right side of door  12 . 
     This same operation of locking rod  40  interacting with first lower latch  48  is also occurring at the same time with first upper latch  65 , resulting in the right side of door  12  to be able to be moved between open and closed positions. Likewise, locking rods  40  are associated with handle assembly  18 ′ on the left side of door  12  and locking rods  40  interact with second lower latch  50  and second upper latch  67  on the left side of door  12  as that which has been described for the right side of door  12  above. Handle assemblies  18 ′ and  20 ′ as referred to and described herein, are connected to locking rods  40  and assist to move locking rods  40  between extended and retracted positions, to lock and unlock the lower and upper latches positioned on that side of the door in which the handle assembly is located. 
     Now referring to  FIGS. 31 and 32 , handle assembly  300  is shown for right hand handle assembly  20 ′ positioned on the right hand portion of door  12 . Handle  20  is positioned, in this embodiment, in a first position, which is generally a vertical position and is mounted to door  12  with bracket  23 . Handle  20  is positioned to rotate about an axis of rotation  314  which extends through a shaft of bolt  315  wherein a longitudinal axis of bolt  315  coincides with the axis of rotation  314 . Bolt  315  secures together assembly  20 ′ between head  313  at one end and handle  20  at the other end, wherein threads defined in bolt  315  engage threads not shown in receptacle  319  of handle  312 . 
     In referring to  FIGS. 31 and 32 , in this embodiment, locking washer  316  engages a receptacle  317  configured to lock with locking washer  316  which is formed on handle  312 . Washer  318  is interposed between locking washer  316  and one side  330  of plate  320 . Plate  320  will be described below for receiving an arm of torsion spring  356 . Plate  320  can be made in a variety of shapes and in this embodiment it takes on a circular configuration but can also be other shapes such as rectangular. Drive member  322  is positioned on opposing side  327  of plate  320 . Drive member  322  defines a cylindrical shaped opening  323  which passes through a length of drive member  322  and provides a noncircular projection  324  extending from one end of drive member  322 . In this embodiment, projection  324  is generally square in shape. Projection  324  engages a noncircular opening  326 , in this embodiment is a square opening, defined in plate  320  on opposing side  327  of plate  320 . Noncircular formation  328  defined by handle  302  engages noncircular opening  326  on one side  330  of plate  320 . In this embodiment noncircular foil ration  328  is a square formation, formation  328  also engages and passes through noncircular opening  332  defined in locking washer  316  and engages and passes through noncircular opening  334  defined in washer  318 . In this embodiment both openings  332  and  334  are also square in shape. With bolt  315  passing through openings  323 ,  326 ,  334  and  332  and being secured to handle  302  with threads within receptacle  319 , defined in handle  20 , handle  20 , locking washer  316 , washer  318 , plate  320  and drive member  322  all rotate connected together about axis of rotation  314 . 
     Drive pin  336  extends radially from drive member  322 , as seen in  FIGS. 31-33 . Drive pin  336  define a threaded end (not shown) and is received by compatible threads (not shown) defined in drive member  322  to releasably engage drive pin  336  with drive member  332 . Drive pin  336 , in this embodiment, is not secured to drive member  322  until after drive member  322  has been inserted into drive receiving member  338 . In this embodiment, drive member  322  defines a generally cylindrical external shape that can be received by a cylindrically shaped opening  340  defined by drive receiving member  338 , wherein drive member  322  can rotate within cylindrical opening  340 . Drive receiving member  338  further defines an opening  342  with first and second spaced apart opposing sidewalls  344  and  346 , as seen in  FIG. 33 . In this embodiment, opening  342  is in the configuration of a slot. With drive member  322  positioned within drive receiving member  338 , and threads defined within drive member  322  align with slot or opening  342 , drive pin  336  can be secured to drive member  322  with respect to compatible threads through opening  342 . With pin member  336  engaged to drive member  322 , drive pin  336  is positioned within opening  342  and is movable within opening  342 . Pin  336  within opening  342  is permitted to travel within opening or slot  342  between first and second sidewalls  344  and  346 , as seen in  FIG. 33 . 
     Drive receiving member  338  defines an opening  348  which communicates with cylindrical opening  340  and allows bolt  315  to pass through drive receiving member  338  permitting drive receiving member  338  to rotate about axis of rotation  314 . Cam  350  defines a noncircular opening  352 , again in this embodiment opening  352  is square, which aligns with opening  348  of drive receiving member  338  which permits bolt  325  to pass through openings  348  and  352  such that drive receiving member  338  and cam  350 . Cam  350  also abuts drive receiving member  338  such that with drive receiving member  338  defines a noncircular projection  354 , in this embodiment projection  354  is square in shape, projection  354  engages opening  352  of cam  350 . With cam  350  engaged to drive receiving member  338 , cam  350  and drive receiving member  338  are permitted to rotate together about axis of rotation  314 . 
     Torsion spring  356  is positioned about drive receiving member  338  and thereby bolt  315  also passes through opening  355  of spring  356 , such that spring  356  is positioned about axis of rotation  314 . First arm  358  of torsion spring  356  is connected to handle  20  through first arm  358  engaging arm receiving opening  359  defined in plate  320 . Thus, as handle  20  moves or rotates, first arm  358  moves or rotates with handle  312 . Second arm  360  is positioned in proximity to cam  350  such that arm  360  will move or rotate in the same direction as cam  350 . In this embodiment, second arm  360  is positioned proximate to and spaced apart from cam  350 , as seen in  FIG. 34 , such that second arm  360  and cam  350  can engage each other with arm  360  and cam  360  in a mutual path of rotation with one another. As will be appreciated in  FIG. 38 , second arm  360  of torsion spring  356  is in contact with cam  30  wherein second arm  360  is urging cam  350  to rotate in a downward direction. 
     In referring to  FIGS. 31-33 , handle assembly  300  for right side handle assembly  20 ′ is shown in a first closed position with handle  20  in a first position. In this position, locking rods  40  are in an extended position, as seen in  FIG. 34  and locking rods  40  lock latches  48  and  65  as seen in  FIGS. 17 and 18 . In referring to  FIGS. 31 and 32 , cam  350  is in a first position, in this embodiment cam  350  extends in a vertical direction. Torsion spring  356  is in a relaxed or unloaded position. Drive pin  336 , as seen in  FIG. 33 , is positioned adjacent first sidewall  344  in slot or opening  342 . 
     Thus, in moving handle  20  from its first closed position with a counterclockwise rotation, as seen in  FIGS. 35 and 36 , drive pin  336  exerts a force or pushes against first sidewall  344  as handle  20  is moved and causes drive receiving member  338  and cam  350  to also rotate in a counterclockwise direction as handle  20 , until handle  20  reaches its second position as seen in  FIG. 35 . Handle assembly  20 ′ is now in an open position with handle  312  in a second position. Cam  350  has been rotated to a second position by drive receiving member  338  which has been rotated by drive pin  336  caused by handle  20  being moved to the second position. Drive pin  336 , as seen in  FIGS. 34-36  remains against first sidewall  344  of slot or opening  342 . Torsion spring  356  has also been moved or rotated with first arm  358  engaged to plate  320  to a second position. Second arm was free to rotate at the same time as first arm  358 , torsion spring  356  remains unloaded and has stored no energy. As seen in  FIG. 36 , second arm  360  is still in a spaced apart relationship to cam  350  as seen in  FIG. 34 . 
     With handle  20  in the second position, as seen in  FIGS. 35 and 36 , locking rods  40  have been retracted and have been removed from openings  308  and  310  of bearing plate  306  and latch linkage arm  62 . Door  12  can now be opened from the right side of door  12  and latches  48  and  65  will be permitted to rotate out of blocking relationship with their corresponding hinge pins  57  and  51  with pulling door  12  away from frame  16 . As latch  48  rotates to an open position, as seen in  FIG. 9 , openings  308  and  310 , as seen in  FIGS. 26 and 27 , are moved out of alignment with locking rod  40 , as seen in  FIGS. 26 and 27 . 
     With door  12  in an open position on the right side of door  12 , as seen in  FIG. 3 , handle  20  may, at the election of the user, be rotated back in a clockwise direction and returned to first position and assembly  20 ′ is in a second closed position as seen in  FIGS. 37 and 38  with door  12  not in a closed position. Cam  350  remains blocked in the second position and cannot move or rotate with rods  40  abutting bearing plate  306 , as seen in  FIGS. 26 and 27  and  FIGS. 37 and 38 . Drive pin  336  has moved away from first sidewall  344  of slot  342  and traveled within slot  342  to a position, in this embodiment, adjacent sidewall  346 , as seen in  FIG. 38  and thereby not moving drive receiving member  338 . In the meantime, plate  320  and drive member  322  have rotated with handle  20  in a clockwise direction. 
     However, with door  12  not yet in fully closed position as seen in  FIGS. 26 and 27 , locking rod  40  is not in alignment with openings  308  and  310 . Locking rods  40  remain abutting bearing plate  306  and as handle  20  moves clockwise, as set forth above, from second position to the first position, first arm  358  of torsion spring  356  is rotated in a clockwise direction as well. This causes second arm  360  to close its gap with cam  350  and it now pushes against cam  350  trying to urge cam  350  to rotate in a downward direction. Thus, with assembly  20 ′ now in a second closed position, rods  40  remain in a retracted position and torsion spring  356  is now in a loaded position. In a loaded position, torsion spring  356  is urging locking rods  40  to be moved to an extended position but rods  40  as mentioned are blocked by and are abutting bearing plate  306 . Rods  40  will be moved automatically by loaded torsion spring  356  to an extended locking position with respect to openings  308  and  310 , when door  12  and movable latches  48  and  65  are closed. Because bearing plate  306  and latch linkage arm  62  are connected to movable latches  48  and  65 , openings  308  and  310  are moved to align with locking rod  40  with door  12  moved to a closed position. With alignment of openings  308  and  310  with locking rods  40 , second arm  360  of torsion spring  356  rotates cam  350  thereby automatically moving locking rods  40  to an extended position and into engagement with openings  308  and  310 , as seen in  FIGS. 9C ,  17  and  18 . With door  12  closed, latches  48  and  65  are closed and form hinges with hinge pins  57  and  51  respectively and with locking rods  40  in an extended position latches  48  and  65  are locked. 
     In referring to  FIG. 39 , handle assembly  18 ′ is shown which is on the left side of doors  12  and  17 . Handle  18  in assembly  18 ′ rotates in a clockwise direction in moving from a first position as seen in  FIG. 39  to a second position wherein handle  18  will be extending approximately perpendicular to the position handle  18  extended in the first position. Handle  18  is used to lock and unlock latches  50  and  67  on the left side of door  12  and door  17 . In assembly  18 ′ the components of the structure is similar to assembly  20 ′. However there are differences so as to accommodate the same results for handle assembly  20 ′ but with moving handle  18  in a clockwise direction  357 , as seen in  FIG. 39 , when moving handle  18  from a first position to a second position and moving handle  18  in a counterclockwise direction when moving handle  18  from the second position to the first position. With respect to second arm  360  of torsion spring  356 , it is now positioned spaced apart from cam  350  on an opposite side of cam  350  as comparing  FIG. 40  and  FIG. 34 . Drive pin  336  begins with assembly  18 ′ in its first closed position in  FIG. 39 , being adjacent to and positioned on second sidewall  346  of slot  342 . Thus, when handle  18  is first rotated in the clockwise direction  357  from its first position, as seen in  FIG. 39 , drive pin  336  immediately starts to rotate drive receiving member  338  in a clockwise direction as well. With handle in the second position, locking rods  40  are in a retracted position. 
     Thus with returning handle  18  from the second to the first position and locking rods  40  are blocked and cam  350  is therefore blocked, drive pin has traveled within slot  342  to the first sidewall  344 . The returning of handle  18  to its first position from its second, has caused second arm  360  of torsion spring  356  to abut and push against cam  350 . With door  12  moved to a closed position and latches  50  and  67  moved to a closed position locking rods  40  will be automatically extended by torsion spring  356  into engaged with openings  308  and  310  thereby locking latches  50  and  67 . 
     The foregoing description of the various embodiments of the invention have been presented for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the precise form disclosed. The description was selected to best explain the principles of the invention and its practical application to enable others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention not be limited by the specification, but be defined by the claims set forth below.