Abstract:
A portable pet portal insert for a sliding patio door includes separate top, center, and bottom modules that can be assembled together through use of tongue and groove fittings therebetween, with the bottom module having a cutout portion adapted for receiving a pet portal, the pet portal including a pivotal flap, a cam operated lock for preventing movement of the flap away from an associated frame, and a weather seal mechanism.

Description:
BACKGROUND OF THE INVENTION 
   Pet access doors provide an opening, usually equipped with a swinging flap, through which pets can leave or enter a home or other building. The pet access door may be set in a frame for installation in a wall or solid core door. In order to allow a means of passage for a pet through a sliding glass patio door, the door must be left ajar by sliding the moveable glass door away from the patio door frame. The majority of pet access doors manufactured for sliding glass patio doors consist of a rectangular panel designed to fill the opening created when the sliding glass patio door is ajar. A pet portal is inserted into the rectangular panel providing a means of egress and ingress for the pet. Generally sliding glass patio door pet access doors are constructed of a glass panel in the upper portion and a swinging flap pet portal in the lowermost portion encased in an aluminum frame. 
   A number of undesirable attributes are associated with the current art involving sliding glass patio door pet access doors. The majority of pet access doors manufactured for sliding glass patio doors require permanent of semi-permanent installations while others may require modification of one or more components of the existing sliding glass patio door to facilitate installation of the pet access door. 
   Current art limits the size of the pet access door to the specifications determined at the time of manufacture and cannot be modified in the field. Therefore, once purchased and installed the sliding glass patio door pet access door may be too large for young pets or become too small for pets as they grow or may not be suitable for subsequent pet needs. 
   The aluminum framed glass panel and swinging flap pet portal construction of the majority of sliding glass patio door pet access doors results in poor insulation quality and limits privacy when in use. Generally, the aluminum frame of the pet access door is designed to abut the moveable sliding door and the patio door frame. This configuration relies on a self stick soft rubber weather strip and the method and level of pressure applied to hold the moveable sliding glass patio door against the pet access door and the patio door frame. The integral height adjustable insert at the uppermost portion of the pet access door and the swinging flap pet port in the lowermost portion of the pet access door are also prone to air infiltration. Furthermore, the barrier to heat loss or gain through the single pain of glass in most pet access doors is inferior to most insulated double or triple pain sliding glass patio doors. When in use the sliding glass patio door curtains, drapes, vertical blinds or other privacy covering must be left open to permit the pet access to the pet portal. Leaving the sliding glass patio door coverings open in this manner may result in a loss of privacy. 
   Storage and transport of most sliding glass patio door pet access doors is costly and inconvenient. The majority of sliding glass patio door pet access doors are of a one piece glass and aluminum frame construction and roughly equivalent in length to the height of a sliding glass patio door opening. The size of the pet access door makes storage difficult and limits the method of transportation resulting in excessive transportation costs. 
   The purpose of the invention, therefore, is to provide a sliding glass patio door pet access door that, requires no modification to existing sliding glass patio door to install, can be modified in the field to grow with a pet, offers optimal insulation quality and privacy and facilitate transportation and storage capability. 
   SUMMARY OF THE INVENTION 
   The invention provides a modular component pet access door designed for use in sliding glass patio doors. The modular construction permits the apparatus to be packaged and stored in a portable compact container when in a disassembled state. The compact size of the disassembled unit minimizes storage space requirements while facilitating transportation opportunities by the retailer and consumer. Top, bottom and center modules of the apparatus are insulation filled injection and/or injection blow molded polymer components offering an insulation value and privacy superior to existing art. The pet portal assembly is designed with a tapered flap and floating magnetic weather seal offering a barrier to air infiltration superior to magnetic flap closures on most sliding glass patio door pet access doors. Furthermore, pet portal assembly permits the portal flap to be lowered into a channel formed by the interior and exterior frame components to create an effective flap lock with the turn of a knob. Modular construction and the design of components permit the invention to be changed in the field to accommodate a variety of styles and sizes of sliding glass patio doors. The universal nature of the modular construction and component system enhances the portability of the apparatus and permits the pet access door to be adjusted in the field to accommodate a growing pet or a new pet. 
   The invention requires no tools to install nor does it require modification to any component of an existing sliding glass patio door. The apparatus is modular in construction consisting primarily of five pre-assembled components. When assembled the modules and components create a sliding glass patio door pet access door panel. The five components are interlocked through a tongue and groove system molded into the modules and components. A tongue molded into the top and bottom of the uppermost and lower most modules slide into grooves molded into the top and bottom of the center module, the bottom of the top weather seal and the top of the bottom weather seal. 
   In the preferred embodiment the center module of the pet access door panel is provided with a universal locking system installed and the bottom module with a pet portal assembly installed. The universal locking system permits the sliding glass patio door locking components to be used in conjunction with the invention installed when opening or closing the moveable sliding glass door. 
   In another embodiment, the invention is provided without a universal locking system installed in the center module of the pet access door panel. In this embodiment the drop lock security lock component of the invention is used in place of the sliding glass door locking components with the invention installed when opening or closing the moveable sliding glass door. 
   In another embodiment, the invention is provided without a universal locking system installed in the center module of the pet access door panel and the bottom module is provided as a blank panel without the pet portal assembly installed. In this embodiment, the drop lock security lock component of the invention is used in place of the sliding glass door locking components with the invention installed when opening or closing the moveable sliding glass door. The bottom module is provided as a blank panel and designed to permit the consumer to install other commercially available pet portals. 
   The invention is designed to be assembled in the field by the consumer. The five primary modules and components slide together forming a rigid panel with a height adjustable weather seal in the uppermost portion of the assembled panel. Once assembled the panel may be installed and removed as one piece. The leading edge of the panel is designed to fit into the moveable sliding door side of the patio door frame to create a secure fit and effective weather seal. The trailing edge of the assembled panel forms a channel designed to receive the leading edge of the moveable sliding patio door similar to the patio door frame creating a secure fit and effective weather seal. When raised to an upright position, inserted into the patio door upper track and dropped into the patio door lower track the assembled panel fills and seals the opening necessary for the pet portal. After installation of the assembled panel into the sliding glass patio door the drop lock security lock component of the invention is installed between the trailing edge of the moveable sliding glass door and the patio door frame abutting the fixed glass door. The drop lock component of the invention serves as a secondary security lock in the preferred embodiment and as a primary locking system in another embodiment. The drop lock handle is conveniently located allowing the handle bar to be lifted from a locked position into a stored unlocked position. In so doing, the moveable sliding glass patio door may be opened to permit standard use of the patio door or to facilitate installation and removal of the pet access door assembled panel. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present embodiments of the invention are described in detail below with reference to the drawings, in which like items are identified by the same reference designation, wherein; 
       FIG. 1  is a front or interior elevational view of the pet access door installed in a sliding glass patio door with the moveable sliding door in a closed position, providing partial access through the sliding glass door when the moveable sliding door is moved to an open position, for various embodiments of the invention. 
       FIG. 2  is a back or exterior elevational view of the pet access door installed in a sliding glass patio door with the moveable sliding door in a closed position, providing partial access through the sliding glass door when the moveable sliding door is moved to an open position. 
       FIGS. 3A–3C  show front elevational assembly views of the five primary modules and components comprising the pet access door panel, and illustrate how the modules and components slide together to assemble the pet access door. 
       FIG. 3D  is a perspective view illustrating the initiation of installation of the pet access door into a sliding glass patio door. 
       FIG. 3E  is a partial perspective and elevational view illustrating a step in the installation of the pet access door into a sliding glass patio door. 
       FIG. 3F  is an elevational view illustrating a step in the installation of the pet access door into a sliding glass patio door. 
       FIGS. 4A ,  4 C, and  4 D are front elevational or interior, left elevational or trailing side, and right elevational or leading side views, respectively, of the top module subassembly with weather seal shims in place. 
       FIG. 4B  is a top plan view of the top module subassembly with weather seal shims in place, the bottom plan view being identical thereto. 
       FIGS. 5A ,  5 C, and  5 D are front elevational or interior, left elevational or trailing side, and right elevational or leading side views, respectively, of the top module without weather seal shims. 
       FIG. 5B  is a top plan view of the top module without weather seal shims, the bottom plan view being identical thereto. 
       FIGS. 6A ,  6 C, and  6 D are front elevational, back elevational, and right elevational side views, respectively, of the left or trailing side top and bottom module thick patio door weather seal shim, the left elevational side view being identical to the latter. 
       FIG. 6B  is a top plan view of the left or trailing side top and bottom module thick patio door weather seal shim, the bottom plan view being identical thereto. 
       FIG. 6E  is a partial cross sectional view taken along  6 E— 6 E of  FIG. 1  of the moveable patio door, trailing side weather seal shim, pet access door, leading edge weather seal shim and sliding glass patio door frame, illustrating function of the weather seal shims in a thick patio door configuration. 
       FIGS. 7A ,  7 C, and  7 D are front elevational, back elevational, and right elevational side views, respectively, of the left or trailing side top and bottom module thin patio door weather seal shim, the left elevational side view being identical to the latter. 
       FIG. 7B  is a top plan view of the left or trailing side top and bottom module thin patio door weather seal shim, the bottom plan view being identical thereto. 
       FIG. 7E  is a partial cross sectional view taken along  6 E— 6 E of  FIG. 1  of the moveable patio door, trailing side weather seal shim, pet access door and sliding glass patio door frame, illustrating the function of the trailing side weather seal shim and the leading side of the pet access door in a thick patio door configuration. 
       FIGS. 8A ,  8 C, and  8 D are front elevational, back elevational, and right elevational side views, respectively, of the right or leading side top and bottom module weather seal shim required for thick patio door installations of the pet access door, the left elevational side view being identical to the latter. 
       FIG. 8B  is a top plan view of the right or leading side top and bottom module weather seal shim required for thick patio door installations of the pet access door, the bottom plan view being identical thereto. 
       FIGS. 9A ,  9 C, and  9 D are front elevational or interior side, left elevational or trailing side, and right elevational or leading side views, respectively, of the center module subassembly with weather seal shims in place. 
       FIG. 9B  is a top plan view of the center module subassembly with weather seal shims in place, the bottom plan view being identical thereto. 
       FIGS. 10A ,  10 B,  10 D, and  10 E are front elevational or interior, back elevational or exterior, left elevational or trailing side, and right elevational or leading side views, respectively, of the center module without weather seal shims. 
       FIG. 10C  is a top plan view of the center module without weather seal shims, the bottom plan view being-identical thereto. 
       FIGS. 11A ,  11 C, and  11 D are front elevational, back elevational, and right elevational side views, respectively, of the left or trailing side center module thick patio door weather seal shim, the left elevational side view being identical to the latter. 
       FIG. 11B  is a top plan view of the left or trailing side center module thick patio door weather seal shim, the bottom plan view being identical thereto. 
       FIGS. 12A ,  12 C, and  12 D are front elevational, back elevational, and right elevational side views, respectively, of the left or trailing side center module thin patio door weather seal shim, the left elevational side view being identical to the latter. 
       FIG. 12B  is a top plan view of the left or trailing side center module thin patio door weather seal shim, the bottom plan view being identical thereto. 
       FIGS. 13A–13D  are front elevational, back elevational, right elevational side views, and a top plan view, respectively, of the top and bottom module leading edge weather seal shim required for thick patio door installations of the pet access door, the left elevational side view being identical to the latter. 
       FIG. 14A  is a top plan view of the center module configured for alternative and additional embodiments of the invention, the bottom plan view being identical thereto. 
       FIG. 14B  is a front cross sectional view taken along  14 B— 14 B from  FIG. 14C  of center module configured for alternative and additional embodiments of the invention. 
       FIGS. 14C and 14D  are left elevational or trailing side and right elevational or leading side views, respectively, of the center module configured for alternative and additional embodiments of the invention. 
       FIGS. 15A ,  15 C, and  15 D are front elevational or interior, left elevational or trailing side, and right elevational or leading side views, respectively, of the bottom module subassembly with weather seal shims in place. 
       FIG. 15B  is a top plan view of the bottom module subassembly with weather seal shims in place, the bottom plan view being identical thereto. 
       FIGS. 16A ,  16 C, and  16 E are front elevational or interior, left elevational or trailing side, and right elevational or leading side views, respectively, of the bottom module without weather seal shims. 
       FIG. 16B  is a top plan view of the bottom module without weather seal shims, the bottom plan view being identical thereto. 
       FIGS. 17A–17C  are front or interior, left or trailing side, and right or leading side elevational views, respectively, of the top weather seal subassembly affixed to the top module subassembly. 
       FIG. 17D  is a right elevational or leading side view of the top module weather seal subassembly affixed to the top module subassembly showing seating of the sleeve portion of the top module weather seal into an upper track portion of the sliding glass patio door. 
       FIGS. 17E  is a partial cross sectional view taken along  17 E— 17 E of  FIG. 17A . 
       FIGS. 18A–18C  are front elevational, top plan, and bottom plan views, respectively, of the top weather seal subassembly. 
       FIGS. 18D and 18E  are left side elevational or trailing side, and right side elevational or leading side views, respectively, of the top weather seal subassembly. 
       FIG. 18F  is a front cross sectional view taken along  18 F— 18 F from  FIG. 18C  of the top weather seal subassembly. 
       FIGS. 19A–19E  are front elevational, left side elevational, top plan, bottom plan, and right side elevational views, respectively, of the top weather seal subassembly patio door hold-down wedge component. 
       FIGS. 20A–20D  are front elevational (back elevational being identical thereto), right side elevational (left side elevational being identical thereto), top plan and bottom plan views, respectively, of the top weather seal subassembly tension bar component. 
       FIG. 21  is an enlarged cross sectional view of the area of the top weather seal subassembly shown within circle labeled “FIG.  21 ” of  FIG. 18F . 
       FIGS. 22A–22C  are front elevational (back, right, and left side elevational views being identical thereto), top plan, and bottom plan views, respectively, of the top weather seal subassembly tension bar spring guide retaining pin component. 
       FIGS. 23A and 23B  are side elevational, and top plan views, respectively, of the top weather seal subassembly tension bar spring guide retaining pin retainer. 
       FIGS. 24A–24D  are front elevational, side elevational, top plan and bottom plan views, respectively, of the top weather seal subassembly tension bar spring guide component. 
       FIG. 25  is a front elevational view of the top weather seal subassembly tension bar conical spring component. 
       FIGS. 26A–26C  are front elevational (back elevation view being identical thereto), top plan (bottom plan view being identical thereto), and left side elevational (right side elevational view being identical thereto) views, respectively, of the top weather seal subassembly sleeve retainer component. 
       FIGS. 27A–27F  are front elevational (back elevational view being a mirror image), top plan, bottom plan, cross sectional taken along  27 D— 27 D of  FIG. 27C , right side elevational, and left side elevational views, respectively, of the top weather seal subassembly base component. 
       FIGS. 28A–28D  are front elevational, top plan, right side elevational (left side elevational view being identical thereto), and bottom plan views, respectively, of the top weather seal subassembly sleeve component. 
       FIGS. 29A–29C  are front elevational, left elevational or trailing side, and right elevational or leading side views, respectively, of the bottom weather seal subassembly affixed to the bottom module subassembly. 
       FIGS. 30A–30C  are front elevational (back elevational view being identical thereto), top plan, and bottom plan views, respectively, of the bottom weather seal subassembly. 
       FIGS. 30D and 30E  are right side elevational or leading side, and left side elevational or trailing side views of the bottom weather seal subassembly. 
       FIG. 30F  is a cross sectional view taken along  30 F— 30 F from  FIG. 30C  of the bottom weather seal subassembly. 
       FIGS. 31A–31E  are top plan, bottom plan, front elevational (back elevational view being a mirror image), right side elevational, and left side elevational views, respectively, of the bottom weather seal subassembly base component. 
       FIGS. 32A–32D  are top plan, bottom plan, front elevational (back elevational view being identical thereto), and right side elevational (left side elevational being identical thereto), views, respectively, of the bottom weather seal subassembly sleeve retainer component. 
       FIGS. 33A–33D  are top plan, bottom plan, front elevational (back elevational view being identical thereto), and right side elevational (left side elevational view being identical thereto) views, respectively, of the bottom weather seal subassembly sleeve component. 
       FIGS. 34A ,  34 C, and  34 D are front or interior, left or trailing side, and right or leading side elevational views, respectively, of the center module subassembly with universal locking assembly installed, for a preferred embodiment of the invention. 
       FIG. 34B  is a top plan view of the center module with the universal locking assembly installed, for a preferred embodiment of the invention, bottom plan view being identical thereto. 
       FIGS. 35A and 35B  are front elevational, and top plan views, respectively, of the universal locking assembly. 
       FIGS. 36A–36C  are front elevational, top plan, and right side elevational views, respectively, of the universal locking assembly latch subassembly. 
       FIGS. 37A–37C  are front elevational, top plan, and right side elevational views, respectively, of the universal locking assembly latch subassembly latch bar component. 
       FIGS. 38A–38C  are front elevational, top plan, and right side elevational views, respectively, of the universal locking assembly latch subassembly latch arm component. 
       FIG. 39  is a front elevational view of the universal locking assembly latch subassembly latch spring component. 
       FIG. 40  is a front elevational view of the universal locking assembly latch subassembly pin component. 
       FIGS. 41A–41C  are front elevational, top plan, and right side elevational views, respectively, of the universal locking assembly floating catch subassembly. 
       FIG. 41D  shows a top plan view of the universal locking assembly floating catch subassembly catch bar component in blank form. 
       FIG. 42  is an exploded assembly view of the universal locking assembly carrier subassembly. 
       FIG. 43  is a partial cross sectional view of the universal locking assembly carrier subassembly along  43 — 43  of  FIG. 35B . 
       FIGS. 44A–44C  are front elevational, top plan, and bottom plan views, respectively, of the universal locking assembly vertical adjustment and horizontal adjustment knob component. 
       FIGS. 45A–45C  are front elevational, right side elevational, and top plan views, respectively, of the universal locking assembly carrier subassembly carrier component. 
       FIGS. 46A–46C  are front elevational, right side elevational, and top plan views, respectively, of the universal locking assembly carrier subassembly carrier nut component. 
       FIGS. 47A–47C  are partial cross sectional front views, respectively, taken along the longitudinal axis of the center module and sliding glass patio door frame showing the universal locking assembly. 
       FIGS. 48A ,  48 C, and  48 D are front, left side and right side elevational views, respectively, of the bottom module subassembly with the pet portal assembly removed. 
       FIG. 48B  is a bottom plan view of the bottom module subassembly with pet portal assembly removed, the top plan view being identical thereto. 
       FIGS. 49A ,  49 C, and  49 D are front, left side, and right side elevational views, respectively, of the bottom module without the pet portal assembly and weather seal shims. 
       FIG. 49B  is a bottom plan view of the center module with the pet portal assembly and weather seal shims removed, the top plan view being identical thereto. 
       FIG. 49E  is a front elevational view of the bottom module subassembly with the pet portal assembly installed as in the preferred embodiment of the invention. 
       FIG. 49F  is an exploded assembly view of the pet portal assembly and a partial cross sectional view along line  49 F— 49 F of  FIG. 49E  of the bottom module subassembly. 
       FIG. 49G  is a cross sectional side view of the bottom module subassembly with pet portal assembly installed taken along line  49 G— 49 G of  FIG. 49E , illustrating the function of the floating magnetic weather seal with the pet portal flap in a closed position. 
       FIG. 49H  is an enlarged view of the area  49 H circled on the cross sectional view shown in  FIG. 49G , illustrating the function of the magnetic floating weather seal with the pet portal flap in a closed position. 
       FIG. 49I  is a partial cross sectional front view of the bottom module subassembly with pet portal assembly installed taken along line  49 I— 49 I of  FIG. 49C , illustrating the function of the floating magnetic weather seal with the pet portal flap in a closed position. 
       FIG. 49J  is a cross sectional side view of the bottom module subassembly with pet portal assembly installed taken along line  49 J— 49 J of  FIG. 49E , illustrating the function of the floating magnetic weather seal with the pet portal flap in an open position. 
       FIG. 49K  is an enlarged view of the area  49 K circled on the cross sectional view shown in  FIG. 49J , illustrating the function of the magnetic floating weather seal with the pet portal flap in an open position. 
       FIG. 49L  is a partial cross sectional front view of the bottom module subassembly with pet portal assembly installed taken along line  49 L— 49 L of  FIG. 49C , illustrating the function of the floating magnetic weather seal with the pet portal flap in an open position. 
       FIG. 50A  is a partial cross sectional front view of the bottom module subassembly with pet portal assembly installed taken along line  50 A— 50 A of  FIG. 49D , illustrating the flap lock function with the flap in a locked position. 
       FIGS. 50B and 50C  are enlarged partial cross sectional views of the cam locking assembly and the lowermost portion of the flap lock referenced in areas  50 B,  50 C, respectively, as circled on the cross sectional view shown in  FIG. 49G , illustrating function of the flap locking mechanism in a locked position. 
       FIG. 50D  is a partial cross sectional front view of the bottom module subassembly with pet portal assembly installed taken along line  50 D— 50 D of  FIG. 49D , illustrating the flap lock function with the flap in an unlocked position. 
       FIGS. 50E–50F  are enlarged partial cross sectional views of the cam locking assembly and the lowermost portion of the flap lock referenced in areas  50 E,  50 F, respectively, of  FIG. 49G , illustrating function of the flap locking mechanism in an unlocked position. 
       FIG. 51A  is a front elevational view of the bottom module subassembly as a blank panel without a pet portal hole, designed to allow for installation of pet portals produced by various manufacturers as another embodiment of the invention. 
       FIG. 51B  is a cross sectional side view taken along line  51 B— 51 B of  FIG. 51A , of the blank bottom module subassembly without the pet portal hole, designed to allow installation of pet portals produced by various manufacturers as another embodiment of the invention. 
       FIGS. 52A and 52B  are front elevational (back elevational view being identical thereto), and right side elevational (left side elevational view being identical thereto) views, respectively, of the pet portal assembly upper hinge subassembly component. 
       FIGS. 53A and 53B  are front elevational (back elevational view being identical thereto), and right side elevational (left side elevational view being identical thereto) views, respectively, of the pet portal assembly lower hinge subassembly component. 
       FIGS. 54A–54B  are front elevational (back elevational view being identical thereto), and right side elevational (left side elevational view being identical thereto) views, respectively, of the pet portal assembly flap subassembly component. 
       FIG. 55A  is a front elevational view of the bottom module subassembly with pet portal assembly installed in a configuration to accommodate smaller pets. 
       FIG. 55B  is an exploded perspective assembly view of the pet portal assembly illustrating disassembly and reassembly for height and directional changes of the bottom module subassembly in the field. 
       FIG. 55C  is a front elevational view of the bottom module with pet portal assembly removed showing rotation of the bottom module about the horizontal axis to make a height change in the bottom module subassembly. 
       FIG. 55D  is a front elevational view of the bottom module subassembly with pet portal assembly installed in a configuration to accommodate larger pets. 
       FIG. 56A  is a front elevational view of the bottom module with the pet portal assembly removed showing the rotation of the bottom module about the vertical axis to change direction of the bottom module subassembly to accommodate a left opening sliding patio door. 
       FIG. 56B  is a front elevational view of the bottom module subassembly with pet portal assembly installed configured for a left opening sliding patio door. 
       FIG. 57A  is a front or interior elevational view of the sliding glass patio door with pet access door installed showing installation of the drop lock security lock in a locked position. 
       FIGS. 57B and 57C  are top plan, and front elevational views, respectively, of the drop lock handlebar handle in the lower locking bracket, illustrating the configuration of the handlebar handle and lower locking bracket with the drop lock in a locked position. 
       FIGS. 57D and 57E  are top plan, and front elevational views, respectively, of the drop lock handlebar handle in the lower locking bracket, illustrating the configuration of the handlebar handle and lower locking bracket in a neutral position. 
       FIG. 57F  is a front or interior elevational view of the sliding glass patio door with pet access door installed showing installation of the drop lock security lock in an unlocked and stored position. 
       FIGS. 57G and 57H  are top plan, and front elevational views, respectively, of the drop lock handlebar handle in the upper storage bracket, illustrating the configuration of the handlebar handle and upper storage bracket with the drop lock in an unlocked and stored position. 
       FIG. 58A  is a front elevational view of the drop lock security lock in a locked position. 
       FIG. 58B  is a left or trailing side elevational view of the drop lock security lock. 
       FIG. 58C  is a right or leading side elevational view of the drop lock security lock. 
       FIG. 58D  is a partial cross sectional front elevational view taken along the longitudinal axis of the drop lock security lock. 
       FIG. 58E  is a partial cross sectional front elevational view taken along the longitudinal axis of the drop lock security lock in a locked position with the handlebar handle in a neutral position. 
       FIG. 58F  is a partial cross sectional view of the drop lock security lock with the telescoping adjustment slide and fine adjustment mechanism is a retracted position. 
       FIG. 58G  is a partial cross sectional view of the drop lock security lock along a longitudinal axis with the telescoping adjustment slide in an extended position. 
       FIG. 58H  is a partial top plan view of the drop lock security lock with the telescoping adjustment slide in an extended position. 
       FIG. 58I  is a partial cross sectional view along a longitudinal axis of the drop lock security lock showing rotation of the fine adjustment mechanism. 
       FIG. 58J  is a partial cross sectional view along a longitudinal axis of the drop lock security lock with the fine adjustment mechanism in an extended position. 
       FIG. 58K  is a partial cross sectional front elevational view taken along the longitudinal axis of the drop lock security lock in a locked position with the handlebar handle in a locked position. 
       FIG. 59A  is a left side elevational view of the ramp or platform resting board. 
       FIG. 59B  is a top plan view of the ramp or platform resting board. 
       FIG. 59C  is a bottom plan view of the ramp or platform resting board. 
       FIG. 59D  is a back side elevational view of the ramp or platform resting board. 
       FIG. 59E  is a front elevational view of the ramp or platform resting board. 
       FIG. 60A  is an exploded assembly view of a partial left side elevational view of the pet access door panel bottom module and left side elevational view of the bottom module weather seal shown with a left side elevational view of the drop lock security lock unattached. 
       FIG. 60B  is a partial left side elevational view of the pet access door panel bottom module and left side elevational view of the bottom module weather seal shown with a partial left side elevational view of the drop lock security lock attached and in a lowered position. 
       FIG. 60C  is a partial left side elevational view of the pet access door panel bottom module and left side elevational view of the bottom module weather seal shown with a partial left side elevational view of the drop lock security lock attached and in a partially raised position. 
       FIG. 60D  is an exterior elevational view of a sliding glass patio door with the pet access door panel installed showing a step down to the exterior ground surface. 
       FIG. 60E  is an exterior elevational view of a sliding glass patio door with the pet access door panel installed and the ramp or platform resting board attached and in a lowered position. 
       FIG. 60F  is an exterior elevational view of a sliding glass patio door with the pet access door panel installed and the ramp or platform resting board attached and in a partially raised position. 
       FIG. 60G  is an exterior elevational view of a sliding glass patio door with the pet access door panel installed and the ramp or platform resting board attached and in a fully raised position. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   As shown in  FIGS. 1–3 , the preferred embodiment of the invention, pet door panel  25 , is installed between the sliding door frame  11 , and the leading side of frame  15  on movable sliding door  21 , to provide a means of ingress and egress for a pet. Drop lock security lock  6  is installed on the interior side of stationary sliding door  21 , between sliding door frame  11 , and the trailing side of frame  15  on movable sliding door  21 , to secure pet door panel  25  between sliding door frame  11  and the leading side of frame  15  on movable siding door  21 , to prevent movable sliding door  21  from being opened with pet door panel  25  installed. Sliding door frame  11  is typically secured to a building structure  23 , such as a home or office. For illustrative purposes all elevational views, except as noted, depict the sliding glass patio door in a right opening configuration. Therefore, when describing various elements of the invention reference made to right and left side views pertains to installation of the invention in a right opening sliding glass door configuration. However, since the invention may be installed in either a right or left opening sliding glass patio door configuration the term left or right is relative, therefore, the terms leading, trailing, interior and exterior are used in combination or in place of the terms right and left side and front and back views where referenced. 
   The sliding door frame  11  has a lower track portion  29  and an upper track portion  27 . The lower track portion  29  slideably receives at least one sliding door member  21  therein. A complimentary upper track portion  27  is typically positioned on the upper side of the siding glass door frame  11 , in alignment with the lower track portion  29 , enabling the sliding door member  21  to be slideably moved between open and closed positions within the sliding door frame  11 . 
   The preferred embodiment of the invention consists of a pet door panel  25  with pet portal  146 , drop lock security lock  6  with locking bracket  202 , and storage bracket  208 . As shown in  FIG. 3A , pet door panel  25  is an assembly consisting of five primary components; top module weather seal  1 , top module  2 , center module  3 , bottom module  4  with pet portal  146  and bottom module weather seal  5 . Top module weather seal  1 , top module  2 , center module  3 , bottom module  4  with pet portal  146 , and bottom module weather seal  5  are slideably attached to one another for assembly, disassembly, or replacement, as shown in  FIG. 3B , via an interlocking tongue and groove system integral to each component. More particularly, interlocking groove  85 , located in the lowermost portion of top module weather seal  1 , is slideably attached to interlocking tongue  9  located on the uppermost portion of top module  2 , as indicated by directional arrow(s)  35  and/or  350 . Interlocking tongue  9 , located on the lowermost portion of top module  2 , is slideably attached to interlocking groove  22  located on the uppermost portion of center module  3 , as indicated by directional arrows  35  and/or  350 . Interlocking groove  22  located in the lowermost portion of center module  3  is slideably attached to interlocking tongue  19  located in the uppermost portion of bottom module  4  as indicated by directional arrows  35  and/or  350 . Interlocking tongue  19  located in the lowermost portion of bottom module  4  is slideably attached to interlocking groove  96  located in the uppermost portion of bottom module weather seal  5  as indicated by directional arrows  35  and/or  350 . 
     FIG. 3C  shows assembled pet door panel  25  with pet portal  146 . Top module weather seal  1  is attached to top module  2  at seam  37 , top module  2  is attached to center module  3  at seam  39 , center module  3  with pet portal  146  is attached to bottom module  4  at seam  41 , and bottom module  4  with pet portal  146  is attached to bottom module weather seal  5  at seam  43 . 
     FIGS. 3D–3F  show installation of the assembled pet door panel  25  with pet portal  146  into an existing sliding glass door assembly. Although assembled pet door panel  25  may be assembled in place within sliding door frame  11 , the preferred method of assembly is accomplished on a flat surface such as a floor or table top. When assembled outside of sliding door frame  11 , the inventive assembled pet door panel  25  is brought to sliding door frame  11  as shown in  FIG. 3D .  FIG. 3E  shows movable sliding glass door  21  being pulled away from sliding door frame  11  to open movable sliding glass door  21  as indicated by directional arrow  45 , to permit pet door panel  25  to be installed. The top module weather seal  1  component located on the uppermost portion of assembled pet door panel  25  is lifted up into a recess of upper track portion  27  of sliding door frame  11 , as shown in by directional arrow  47 , and then rotated into alignment with the upper track portion  27  and a recess of lower track portion  29  of sliding door frame  11 . As shown is  FIGS. 17–18  and described in detail later, the top module weather seal  1  is constructed to allow a spring loaded flexible sleeve to compress in order to fit pet door panel  25  between upper track portion  27  and lower track portion  29  of sliding door frame  11 . When in alignment with upper track portion  27  and lower track portion  29  of sliding door frame  11 , the bottom module weather seal  5  component located on the lowermost portion of assembled pet door panel  25  is lowered into the recessed lower track portion  29  of sliding door frame  11 . As shown in  FIG. 3F , after assembled pet door panel  25  is in place in upper track portion  27  and lower track portion  29  of sliding door frame  11 , between the leading side of frame  15  on movable sliding glass door  21  and sliding door frame  11 , movable sliding glass door  21  is pulled closed against assembled pet door panel  25  as indicated by directional arrow  49 . In turn, assembled pet door panel  25  is pulled against sliding door frame  11  as indicated by directional arrow  51  restricting access through movable sliding glass door  21 , while providing egress and ingress for pets through pet portal  146 . Frame  15  of movable sliding glass door  21  abuts the trailing side of assembled door panel  25  within a channel formed by trailing side weather seal shims  12  or  13  (see  FIGS. 6E and 7E ) in top module  2  and bottom module  4 , and weather seal shims  87  or  89  (see  FIGS. 11A–C , and  12 A–C) in center module  3 , that comprise assembled pet door panel  25 , with assembled pet door panel  25  installed and movable sliding glass door  21  in a closed position. When installed, the leading side of assembled pet door panel  25  abuts sliding door frame  11 . In the preferred embodiment of the invention, center module  3  contains a universal locking system shown in  FIGS. 34–47 , described later, that allows the installed assembled pet door panel  25  to lock into sliding door frame  11 , and movable glass sliding door  21  to lock into the installed assembled pet door panel  25 . 
   After installation of assembled pet door panel  25  as described above, drop lock security lock  6  is installed between the trailing side of frame  15  on movable sliding glass door  21  and sliding door frame  11 , as shown in  FIG. 1 . Drop lock security lock  6  described later and shown in detail in  FIGS. 57–58  consists of an adjustable lower housing assembly that sits in lower track portion  29  of sliding door frame  11  between the trailing side of frame  15  on movable sliding door  21  and sliding door frame  11  with assembled pet door panel  25  installed. Drop lock security lock  6  is attached to the trailing side of frame  15  on movable sliding door  21  by drop lock security lock  6  handlebar  180  (see  FIGS. 57C ,  57 E, and  58 A) and locking bracket  202  which is mounted on the trailing side of frame  15  of movable sliding door  21 . Drop lock security lock  6  can be installed in any sliding glass door between the trailing side of frame  15  on movable sliding glass door  21  and sliding door frame  11 , with or without assembled pet door panel  25  installed to prevent forced entry from the exterior or unintentional opening from the interior of the structure. 
   In another embodiment of the invention, drop lock security lock  6  is the primary means of locking movable sliding glass door  21  with assembled pet door panel  25  installed. In order to open movable sliding glass door  21 , the handlebar  180  is rotated out of a locked position in locking bracket  202  and lifted to storage bracket  208  also located on the trailing side of frame  15  on movable sliding glass door  21 . In so doing, the adjustable telescoping housing  188  (see  FIGS. 58A–58K ) is lifted out of lower track portion  29  of sliding door frame  11  allowing movable sliding glass door  21  to be pulled opened for passage or installation or removal of assembled pet door panel  25 . 
   Top module  2 , center module  3 , and bottom module  4  are designed to be of an injection molded or injection blow molded polymer construction with a rigid insulation core. This type of construction provides privacy while providing insulation quality superior to prior art. All three modules are designed to fit a variety of sliding glass patio door heights and door thicknesses through an adjustable top module weather seal  1  and left or trailing side and right or leading side weather seal shims  12  or  13 , and  8 , respectively. 
     FIGS. 4A–4D  are front or interior, top, trailing and leading side views of assembled pet access door top module  2 . The back or exterior view of top module  2  is a mirror image of the front or interior view of top module  2  illustrated in  FIG. 4A . The bottom view of top module  2  is identical to the top view of module  2  illustrated in  FIG. 4B . The front of top module  2  includes an interlocking tongue  9  in the uppermost portion of top module  2 , and an identical interlocking tongue  9  located in the lowermost portion of top module  2 . Leading side weather seal shim  8  is designed to fill and seal the channel  61  (see  FIG. 6E ) in the upright portion of sliding door frame  11 . Channel  61  is configured to receive leading side frame  15  of movable sliding glass door  21  in thick sliding glass patio door applications, as shown in  FIG. 6E . For purposes of example, a thick sliding patio door  21  typically has a leading edge or side thickness of 1¾ inch, whereas a thin sliding patio door  21  typically has a leading edge or side thickness 1½ inch.  FIG. 6E  is an exploded assembly and partial cross sectional top view of leading side frame  15  of movable sliding glass door  21 , top module  2  of pet door panel  25 , and upright portion of sliding door frame  11 . 
     FIG. 4C  is a left or trailing side view of module  2 , which shows trailing side weather seal shim  12  installed thereon.  FIG. 4D  is a right or leading side view of top module  2  which shows leading side weather seal shim  8 , as installed. Both  FIGS. 4C and 4D  show trailing and leading side views, respectively, of top module  2  tongue  9  at the uppermost and lowermost portions of top module  2 . 
     FIG. 4B  is a top view of top module  2 , which shows both the leading side  8  and trailing side  12  weather seal shims and top module weather seal  1  spring guide holes  14 . Leading weather seal shim  8  is not necessary when used in combination with a thin movable sliding glass door  21  since the leading edge of top module  2  fits into channel  61  as shown in  FIG. 7E . Channel  61 , for example, typically has a width of 1 13/16 inch for thick siding patio doors  21 , and 1 9/16 inch for thin sliding patio doors  21 . With the invention configured for a thin sliding glass patio door application, leading side weather seal shim  8  is omitted and trailing side weather seal shim  13  is used in place of trailing side weather seal shim  12  as shown in  FIG. 7E . 
     FIG. 7E  is an exploded assembly and partial cross sectional top view of leading side frame  15  of movable sliding glass door  21 , top module  2  of assembled pet door panel  25 , and an upright portion of sliding door frame  11 . As shown in  FIG. 4B , weather seal shim  8  is designed to slide or snap into identical retention grooves  16  located on a vertical plane on both the front and back sides adjacent to the right or leading side of top module  2 . Trailing side weather seal shim  12  located on the trailing side of top module  2  is contained within retention lips  18 , as shown in  FIG. 4B , and is designed to accept the leading side frame  15  of movable sliding glass door  21  in thick sliding glass patio door applications. 
     FIGS. 6A–6D  show various views, respectively, of thick sliding glass patio door trailing side weather seal shim  12 , and  FIGS. 7A–7B  show various views, respectively, of thin sliding glass patio door trailing side weather seal shim  13 .  FIGS. 6B and 7B  show channels  53  and  530 , which are designed to receive frame  15  of movable sliding glass door  21  in a thick sliding glass patio door application. The width of bends running along the vertical axis of trailing side weather seal shim  12  and  13  shown as  55  and  550  in  FIGS. 6A ,  6 B,  6 E,  7 A,  7 B and  7 E, respectively, serve as a shim in either thin or thick movable sliding glass door  21  configurations. In  FIGS. 6B and 6E  vertical axis bends  55  are thin creating a wide channel  53  designed to receive leading side frame  15  of movable sliding glass door  21  in a thick sliding glass door application. Vertical axis bend  550  shown in  FIGS. 7B and 7E  is wider than bend  55  of shim  12 , which narrows channel  530  to receive leading side frame  15  of movable sliding glass door  21  in a thin sliding glass door application. A portion of trailing side weather seal shim  12  and  13  shown as  57  and  570 , respectively, in  FIGS. 6A ,  6 B,  7 A and  7 B is bent inward along a vertical axis to create channel  53 ,  530 , walls designed to create an effective weather seal against leading side frame  15  of sliding glass door  21 .  FIGS. 8A–8D  show various views of right or leading side weather seal shim  8  used on top module  2  to fill and seal channel  61  in the upright portion of door frame  11  in thick movable sliding glass door  21  configuration as shown in  FIG. 6E . 
     FIGS. 5A–5D  are front or interior, top, trailing and leading side views of top module  2  with trailing and leading side weather seal shims removed. The back or exterior view of top module  2  is a mirror image of the front or interior view of top module  2  illustrated in  FIG. 5A . The bottom view of top module  2  is identical to the top view of module  2  illustrated in  FIG. 5B .  FIG. 5A  is a front or interior view of top module  2  showing interlocking tongue  9  in the uppermost portion of top module  2  and an identical interlocking tongue  9  located in the lowermost portion of top module  2 .  FIG. 5A  also shows the left or trailing side  10  and right or leading side  7  of top module  2 . Retention grooves  16  for receiving and retaining right or leading side weather seal shim  8  are shown running vertically at the right or leading side  7  of top module  2 .  FIG. 5B  is a top view of top module  2  showing interlocking tongue  9 . Interlocking tongue  9  runs along a horizontal plane on the top and bottom of top module  2 .  FIG. 5B  shows top module weather seal spring guide holes  14  which run through interlocking tongue  9  into top module  2  in the uppermost and lowermost portion of top module  2 . Right or leading side weather seal shim retention grooves  16  and left or trailing side weather seal shim retention lips  18  are shown in  FIG. 5B .  FIG. 5C  is a left or trailing side view of top module  2 , and  FIG. 5D  is a right or leading side view of top module  2 . 
     FIGS. 6A–6D  show various views of trailing side weather seal shim  12  which is designed for use in thick sliding glass patio door applications.  FIG. 6A  is a tailing side view of trailing weather seal shim  12  showing shim spacer bends  55  and sealing tabs  57 .  FIG. 6B  is a top view of trailing weather seal shim  12 , the bottom view is identical to the top view. Top view  FIG. 6B  shows channel  53  designed to accept the leading side of door frame  15  of movable sliding glass door  21 . Channel  53  is formed by shim spacer bends  55  and sealing tabs  57  that run vertically along the length of trailing weather seal shim  12 .  FIG. 6C  is a back side view of trailing side weather seal shim  12 , and  FIG. 6D  is a side view of tailing side weather seal shim  12 . 
     FIG. 6E  is a partial cross sectional top view of movable sliding glass door  21  leading side frame  15 , assembled pet access door top module  2  configured for thick sliding glass patio door and upright portion of sliding glass patio door frame  11 .  FIG. 6E  shows leading side frame  15  of movable sliding glass patio door  21  sliding into the trailing side of assembled pet access door top module  2  in the direction indicated by directional arrow  49 . Leading side frame  15  of movable siding glass patio door  21  fits into channel  53  formed by shim spacer bends  55  and sealing tabs  57  in the trailing side weather seal shim  12 . Trailing weather seal shim  12  is retained in the trailing side of pet access door module  2  by retention lips  18 . Leading side door frame  15  of movable sliding glass door  21  is guided into channel  53  and held in place by shim spacer bends  55 . When leading door frame  15  is seated in channel  53 , tabs  57  are compressed and held against leading door frame  15  of movable sliding glass door  21  to create an effective weather seal; The leading side of assembled pet access door top module  2  slides into channel  61  of the upright portion of sliding glass patio door frame  11  in the direction indicated by directional arrow  51 . The leading side of assembled pet access door top module  2  is configured for a thick sliding glass patio door and therefore, shows leading side weather seal shim  8  affixed to assemble top module  2 . As shown in  FIGS. 8A–8D  and described in greater detail later, leading side weather seal shim  8  is held in place on top module  2  by retaining tabs  59  that snap or slide into retention grooves  16  located on the leading side of pet access door top module  2 . Leading side weather seal shim  8  is designed to fit into and seal against channel  61  in upright portion of sliding glass patio door frame  11 . 
     FIGS. 7A–7D  show various views of trailing side weather seal shim  13  which is designed for use in thin sliding glass patio door applications.  FIG. 7A  is a tailing side view of trailing weather seal shim  13  showing shim spacer bends  550  and sealing tabs  570 .  FIG. 7B  is a top view of trailing weather seal shim  13 , the bottom view is identical to the top view. Top view  FIG. 7B  shows channel  530  designed to accept the leading side of door frame  15  of movable sliding glass door  21 . Channel  530  is formed by shim spacer bends  550  and sealing tabs  570  that run vertically along the length of trailing weather seal shim  13 .  FIG. 7C  is a back side view of trailing side weather seal shim  13  and  FIG. 7D  is a side view of tailing side weather seal shim  13 . 
     FIG. 7E  is a partial cross sectional top view of movable sliding glass door  21  leading side frame  15 , assembled pet access door top module  2  configured for thin sliding glass patio door and upright portion of sliding glass patio door frame  11 .  FIG. 7E  shows leading side frame  15  of movable sliding glass patio door  21  sliding into the trailing side of assembled pet access door top module  2  in the direction indicated by directional arrow  49 . Leading side frame  15  of movable siding glass patio door  21  fits into channel  530  formed by shim spacer bends  550  and sealing tabs  570  in the trailing side weather seal shim  13 . Trailing weather seal shim  13  is retained in the trailing side of pet access door module  2  by retention lips  18 . Leading side door frame  15  of movable sliding glass door  21  is guided into channel  530  and held in place by shim spacer bends  550 . When leading slide door frame  15  is seated in channel  530 , tabs  570  are compressed and held against leading door frame  15  of movable sliding glass door  21  to create an effective weather seal. The leading side of assembled pet access door top module  2  slides into channel  61  of the upright portion of sliding glass patio door frame  11  in the direction indicated by directional arrow  51 . The leading side of assembled pet access door top module  2  is configured for a thin sliding glass patio door, and therefore fits and seals in channel  61  of the upright portion of sliding glass patio door frame  11  without the need for a leading side weather seal shim  8 , as required with a thick sliding glass door. 
     FIGS. 8A–8D  show various views of leading side weather seal shim  8 .  FIG. 8A  is a back side view of leading side weather seal shim  8  showing retaining tabs  59  that interlock with retention grooves  16  in pet access door top module  2 .  FIG. 8B  is a top view of weather seal shim  8 . The bottom view of weather seal shim  8  is identical to top view  FIG. 8B .  FIG. 8B  shows retaining tabs  59  that interlock with retention grooves  16  in pet access door top module  2 .  FIG. 8C  is a leading side view of leading side weather seal shim  8 , and  FIG. 8D  is a side view of leading side weather seal shim  8 . 
     FIGS. 9A–9D  show various views of assembled pet access door center module  3 .  FIG. 9A  is a front or interior view of center module  3  showing access door  32  with opening tab  33 , and leading side weather seal shim  20  with external catch screw mount recess  30 .  FIG. 9B  is a top view of assembled pet access door center module  3 . The bottom view of assembled pet access door center module  3  is identical to the top view  FIG. 9B .  FIG. 9B  is a top view of center module  3 , which shows both the leading side  20  and trailing side  87  weather seal shims. Leading weather seal shim  20  is not necessary when used in combination with a thin movable sliding glass door  21  since the leading side of center module  3  fits into channel  61 , the same as the leading side of top module  2  described earlier and as shown in  FIG. 7E . With the invention configured for a thin sliding glass patio door application, leading side weather seal shim  20  is omitted, and trailing side weather seal shim  89  is used in place of trailing side weather seal shim  87 , the same as trailing side weather seal shim  13  on top module  2  described earlier, as shown in  FIG. 7E . Weather seal shim  20  is designed to slide or snap into retention grooves  16  located on a vertical plane on both the front and back sides adjacent to the right or leading side of center module  3  as shown in  FIG. 9B . Trailing side weather seal shim  87  located on the trailing side of center module  3  contained within retention lips  18  is designed to accept the leading side of frame  15  of movable sliding glass door  21  in thick sliding glass patio door applications. Interlocking groove  22  is located on a horizontal plane on the uppermost and lowermost portions of center module  3  as shown in  FIG. 9B . Grooves  22  interlock with tongues  9 ,  19  located on top module  2  and bottom module  4 , respectively.  FIG. 9C  is a trailing side view of assembled pet access door center module  3  showing slot  36  in trailing side weather seal shim  87  designed to accommodate a universal locking mechanism in another embodiment of the invention.  FIG. 9D  is a leading side view of assembled pet access door center module  3  showing interlocking grooves  22  in the uppermost and lowermost portions of center module  3  with leading side weather seal shim  20  in place.  FIG. 9D  shows external catch slot  40  in leading side weather seal shim  20 . Externally mounted catch cavity  28  and slot  40  designed to accommodate a universal locking mechanism in another embodiment of the invention are shown in the leading side of center module  3  in  FIG. 9D . 
     FIGS. 10A–10E  are various views of center module  3 .  FIG. 10A  is a front or interior view showing access door  32  with access door opening tab  33 . Interlocking leading side weather seal shim grooves  16 , and externally mounted catch mounting screw recess  30  on the leading side  7  of center module  3  are shown in  FIG. 10A .  FIG. 10B  is a back or exterior side view of center module  3  showing the interlocking leading side weather seal shim groove  16 , and externally mounted catch mounting screw recess  30 .  FIG. 10C  is a top view of center module  3  showing interlocking groove  22 , interlocking leading side weather seal shim grooves  16 , and trailing side weather seal shim retention lips  18 .  FIG. 10D  is a trailing side view of center module  3  showing slot  24  designed to accommodate a universal locking mechanism in another embodiment of the invention.  FIG. 10E  is a leading side view of center module  3  showing interlocking groove  22 , externally mounted catch cavity  28 , and externally mounted catch mounting screw recess  30 . Slot  26  designed to accommodate a universal locking mechanism in another embodiment of the invention is shown in  FIG. 10E . 
     FIGS. 11A–11D  show various views of thick sliding glass patio door center module  3  trailing side weather seal shim  87 , and  FIGS. 12A–12D  show various views of thin sliding glass patio door center module  3  trailing side weather seal shim  89 . Except for the universal locking mechanism slots  36  and  38  as shown in  FIGS. 11A and 11B ,  12 A and  12 B, respectively, trailing weather seal shims  87  and  89  in center module  3  are designed and function the same as trailing side weather seal shims  12  and  13 , respectively, in top module  2 . Note in this regard,  FIGS. 6A–6E  and  7 A– 7 E, and the description of design and function described earlier. When referring to  FIGS. 6A–6E  substitute center module  3  trailing weather seal shim  87  for top module  2  trailing side weather seal shim  12 . When referring to  FIGS. 7A–7E  substitute center module  3  trailing side weather seal shim  89  for top module  2  trailing side weather seal shim  13 .  FIGS. 13A–13D  show various views of right or leading side weather seal shim  20  used on center module  3  to fill and seal channel  61  in the upright portion of door frame  11  in thick movable sliding glass door  21  configuration as shown in  FIG. 6E . Except for universal locking mechanism slot  40 , leading side weather seal shim  20  in center module  3  is designed and functions the same as leading side weather seal shim  8  in top module  2 . In this regard, note  FIGS. 8A–8D  and  FIG. 6E  and the description of the design and function described earlier. When referring to  FIGS. 8A–8D  and  FIG. 6E , substitute center module  3  leading side weather seal shim  20  for top module  2  leading side weather seal shim  8 . 
     FIGS. 14A–14D  show various views of center module  3  with provision for another embodiment of the invention.  FIG. 14A  is a top view which is identical to the bottom view showing a cross sectional view reference to  FIG. 14B .  FIG. 14B  is a cross sectional view of center module  3  showing pressure switch cavities  42 , battery compartment  44 , and alarm compartment  46  designed to facilitate installation of an alarm system in another embodiment of the invention. A channel  34  and vertical adjustment slot  48  associated with a universal locking assembly as part of another embodiment of the invention are shown in  FIG. 14B .  FIG. 14C  is a trailing side view of center module  3  showing universal locking mechanism slot  24  and alarm system pressure switch hole  42  which are features associated with another embodiment of the invention.  FIG. 14D  is a leading side view of center module  3  which shows interlocking groove  22 , externally mounted catch cavity  28 , and externally mounted catch mounting screw recess  30 . Cavity  28  and mounting screw recess  30  will accommodate a sliding glass patio door with externally mounted catch as shown in  FIG. 47C . In another embodiment of the invention, a universal locking mechanism and alarm system may be incorporated into the device. Provision for a universal locking mechanism slot  26  and pressure switch hole  42  are shown in  FIG. 14D . 
     FIGS. 15A–15D  show various views of the assembled pet access door bottom module  4  configured in the preferred embodiment of the invention with pet portal assembly  146  installed. Pet portal assembly  146  is described later.  FIG. 15A  is a right or interior side view of assembled pet access door bottom module  4  with pet portal assembly  146  installed. Interlocking tongue  19  running along a horizontal plane is shown at the uppermost and lowermost portions of assembled pet access door bottom module  4  in  FIG. 15A . Leading side weather seal shim  8  is shown assembled to the leading side  7  of assembled pet access door bottom module  4  in  FIG. 15A .  FIG. 15B  is a top view of assembled pet access door bottom module  4  and is identical to the bottom view.  FIG. 15B  shows interlocking tongue  19 , leading side weather seal shim  8 , and interlocking weather seal grooves  16  in the leading side of bottom module  4 . Trailing side thick movable sliding glass patio door weather seal shim  12 , and trailing side weather seal shim retention lips  18  are shown in the trailing side of assembled pet access door bottom module  4  in  FIG. 15B .  FIG. 15C  is a trailing side view of assembled pet access door bottom module  4 , which shows thick movable sliding glass patio door weather seal shim  12  running along a vertical plane and interlocking tongue  19  in the uppermost and lowermost portions of assembled pet access door bottom module  4 .  FIG. 15D  is a leading side view of assembled pet access door bottom module  4  showing interlocking tongue  19  in the uppermost and lowermost portions of bottom module  4  and leading side weather seal shim  8  running along a vertical plane. 
     FIGS. 16A–16E  show various views of bottom module  4  with trailing and leading side weather seal shims  8  and  12  removed.  FIG. 16A  is a front or interior side view of bottom module  4  with pet portal assembly  146  installed.  FIG. 16B  is a back or exterior side view of bottom module  4  with pet portal assembly  146  installed and is a mirror view of the front or interior view  16 A except for the flap lock knob.  FIGS. 16A and 16B  show interlocking tongue  19  in the uppermost and lowermost portions of bottom module  4  and interlocking weather seal groove  16  running along a vertical plane on the leading side of bottom module  4 .  FIG. 16C  is a top view of bottom module  4 , the bottom view is identical to the top view.  FIG. 16C  shows interlocking tongue  19 , interlocking leading side weather seal shim groove  16 , trailing side weather seal shim retention lip  18  at the trailing side of bottom module  4 .  FIG. 16D  is a trailing side view of bottom module  4  showing interlocking tongue  19  in the uppermost and lowermost portions of bottom module  4 .  FIG. 16E  is a leading side view of bottom module  4  showing pet portal assembly flange  148  and interlocking tongue  19  in the uppermost and lowermost portions of bottom module  4 . See  FIGS. 6A–6E  and  FIGS. 7A–7E  and description of design and function of trailing side and leading side weather seal shims described earlier. 
     FIGS. 17A–17B  are interior, trailing side and leading side elevational views of top module weather seal  1  shown attached to top module  2 .  FIG. 17A  is an interior side elevational view of top module weather seal  1  attached to top module  2  showing top module weather seal sleeve  50  and base  64 , and a partial view of top module  2  with interlocking leading side weather seal shim groove  16 .  FIG. 17B  is a trailing side elevational view of the top module weather seal attached to top module  2  showing top module weather seal sleeve  50 , base  64 , and partial elevational view of top module  2 .  FIG. 17C  is a leading side elevational view of top module weather seal  1  and a partial elevational view of top module  2 .  FIG. 17C  shows top module weather seal sleeve  50 , base  64 , interlocking groove  85 , and a partial elevational view of top module  2  and interlocking tongue  9 . Top module weather seal  1  is slideably attached to top module  2  by sliding top module weather seal  1  to cause interlocking groove  85  to mate with interlocking tongue  9  as shown in  FIG. 17C . 
     FIGS. 18A–18C  show various views of top module weather seal  1 .  FIG. 18A  is an interior side view showing the top module weather seal sleeve  50  and base  64 . The exterior view is identical to  FIG. 18A .  FIG. 18B  is a top view of top module weather seal  1  showing top module weather seal sleeve  50 .  FIG. 18C  is a bottom view of top module weather seal  1  showing interlocking groove  85 , spring guide stop counter bore  83 , and spring guide  56  in top module weather seal base  64 . 
     FIG. 18D  is a leading side view of top module weather seal  1  showing interlocking groove  85  and the relationship of top module weather seal components, including sleeve  50 , base  64 , sleeve retainer  62 , tension bar  52 , tension bar spring  60 , tension bar spring guides  56 , tension bar pin and retainer set  58 .  FIG. 18E  is a trailing side view of top module weather seal  1  and very similar to the leading side view  FIG. 18D  with the addition of the movable sliding patio door hold-down wedge  54 .  FIG. 18F  is an interior cross sectional view of top module weather seal  1  and further illustrates the relationship of the various components comprising the assembly. Top module weather seal  1  is an assembly designed to slideably attach to assembled top module  2  of the pet access door panel  25 . The top module weather seal functions as a filler to compensate for different heights of sliding glass patio doors as produced by the various manufacturers in order to produce an effective weather seal.  FIG. 19A  is an interior side view of patio door hold-down wedge  54  showing pull tab  66  and the wedge shape of the body  65 .  FIG. 19B  is a trailing side view of patio door hold-down wedge  54  showing the pull tab  66 .  FIG. 19C  is a leading side view, and  FIG. 19D  is a bottom side view. 
     FIGS. 20A–20D  show various views of tension bar  52 .  FIG. 20A  is an interior view showing spring guide pin and retaining ring holes  62 .  FIG. 20B  is a trailing side view.  FIG. 20C  is a top view.  FIG. 20D  is a bottom view showing spring guide slots  70 .  FIG. 21  is an enlarged partial cross sectional view of the spring guide pin  58 P, spring guide  56 , tension bar  52  and top module weather seal sleeve  50 .  FIG. 22A  is a front view of tension bar spring guide pin  58 P showing the pin stop or head  71 , shaft  73  and retaining ring groove  72 .  FIGS. 22B–22C  are top and bottom views, respectively, of tension bar spring guide pin  58 P.  FIGS. 23A–23B  are side and top views, respectively, of tension bar spring guide pin retaining ring  58 R.  FIGS. 24A and 24B  are front and right side views, respectively, of tension bar spring guide  56 , the back and left side views are identical to  FIGS. 24A and 24B , respectively.  FIGS. 24A and 24B  show tension bar spring guide pin hole  74 , tension bar insertion tab  78 , spring guide shaft  77 , and spring guide stop  76 .  FIGS. 24C and 24D  are top and bottom views, respectively, of tension bar spring guide  56 .  FIG. 25  is a side view of tension bar spring  60 .  FIG. 26A  is a front view of sleeve retainer  62  showing spring guide holes  80 .  FIG. 26B  is a top view of sleeve retainer  62  showing spring guide through holes  80 .  FIG. 26C  is a leading edge or side view of sleeve retainer  62 . Back, bottom and trailing side views of sleeve retainer  62  are identical to  FIG. 26A ,  FIG. 26B  and  FIG. 26C , respectively. 
     FIG. 27A  is a front view of top module weather seal base  64 .  FIG. 27B  is a top view of base  64  showing spring guide holes  82  and sleeve retainer channel  84 .  FIG. 27C  is a bottom view of base  64  showing spring guide holes  82 , spring guide stop counter bores  83  and interlocking groove  85 .  FIG. 27D  is an interior side cross sectional view taken along  27 D- 27 D of base  64 , showing sleeve and retainer channel  84 , interlocking groove  85 , spring guide holes  82 , and spring guide stop counter bores  83 . The exterior side view is a mirror image of  FIG. 27D .  FIG. 27E  is a leading or right side elevational view of base  64  showing sleeve and retainer channel  84  and interlocking groove  85 .  FIG. 27F  is a trailing or left side elevational view of base  64  showing sleeve and retainer channel  84 .  FIG. 28A  is front elevational view,  FIG. 28B  a top plan view,  FIG. 28C  a leading or right side elevational view, and  FIG. 28D  is a bottom plan view of top module weather seal  1  rubber sleeve  50 , respectively. 
   As shown in  FIG. 18F  tension bar spring guides  56  are inserted through holes  82 ,  83 ,  80  in the bottom of base  64  (see  FIG. 27C ), sleeve  50 , sleeve retainer  62 , respectively, and the open center of conical tension bar springs  60 . The insertion tab  78  of each tension bar spring guide  56  (see  FIG. 24A ) is then inserted into slot  70  (see  FIG. 20D ) in tension bar  52 , and then attached by insertion of pin and retaining ring set  58  through holes in tension bar  52 , and hole  74  in spring guide  56  within sleeve  50 . Tension bar spring guide stop  76 , the length of spring  60  and the diameter of sleeve  50  limit the extension of the tension bar  52 . The length of travel is dependent upon the length of the tension bar spring guides  56 , springs  60  and sleeve  50 . Once the top module weather seal  1  is attached, pet access door panel  25  as shown in  FIGS. 3A–3C  is installed into the sliding glass patio door  21  by inserting and lifting the top module weather seal  1  at the uppermost portion of assembled pet access door panel  25  into the upper track portion  27  as shown in  FIGS. 3D–3E . When lifting the assembled pet access door panel  25  the top module weather seal  1  is compressed. This causes sleeve  50  to compress against tension bar  52 . Tension bar  52  compresses conical springs  60  by pushing down on spring guides  56  which are pushed through holes in the bottom of base  64 , and through spring guide holes in top module  2 , as shown in  FIG. 17E . This compression of top module weather seal  1  allows the lowermost portion of assembled pet access door panel  25  to be lifted over then lowered into the lower track portion  29  of the sliding glass patio door. Once in place, as in  FIG. 3F , the top module weather seal  1  tension bar springs  60  cause tension bar  52  and sleeve  50  to extend into and against the walls of upper track portion  27  of the sliding glass patio door as shown in  FIGS. 17D  and E. The movable sliding glass door on some patio doors may be lifted out of the lower track portion  29  when the movable sliding glass patio door is ajar as would be the case with a pet access door panel  25  installed. In order to prevent the movable sliding glass patio door  21  from being lifted with the pet access panel  25  installed, the invention is equipped with a hold-down wedge  54  located in the trailing side of tension bar  52 . Once the assembled pet access door panel  25  is installed, patio door hold-down wedge  54  shown in  FIGS. 19A–19E  is extended by pulling on tab  66  attached to patio hold-down wedge body  65 . When the movable sliding glass patio door  21  is closed against the assembled pet access door panel  25 , the movable sliding glass patio door  21  slides under hold-down wedge  54 . Hold-down wedge  54  prevents the movable sliding glass patio door  21  from being lifted out of its associated lower track portion  29 . The combination of top module weather seal  1  and bottom module weather seal  5  permits the pet door panel  25  to fit into a range of frame heights, such as for example from 76.0 inches to 82.0 inches. 
     FIG. 29A  is an interior front elevational view of bottom module weather seal  5  and a partial front elevational view of bottom module  4  showing rubber sleeve  106 , base  88  with mounting brackets  90 .  FIG. 29B  is a trailing or left side elevational view of bottom module weather seal  5 , and a partial trailing side elevational view of bottom module  4  showing rubber sleeve  106 , base  88  with mounting brackets  90 .  FIG. 29C  is a leading or right side elevational view of bottom module weather seal  5  and a partial leading or right side elevational view of bottom module  4  showing rubber sleeve  106 , base  88  with mounting brackets  90 , interlocking groove  85 , and interlocking tongue  19  on bottom module  4  installed in interlocking groove  96  of base  88 . 
     FIG. 30A  is an interior front elevational view of bottom module weather seal  5  showing rubber sleeve  106 , base  88  with mounting brackets  90 .  FIG. 30B  is a top plan view of bottom module weather seal  5 , showing base  88  with interlocking groove  96 , sleeve retainer bolt  105 B, sleeve retainer bolt hole  92 , sleeve retainer bolt head counter bore  94  and mounting brackets  90 .  FIG. 30C  is a bottom plan view of bottom module weather seal  5  showing rubber sleeve  106  and mounting brackets  90 .  FIG. 30D  is a leading or right side view of bottom module weather seal  5  showing rubber sleeve  106 , sleeve retainer  100 , sleeve retainer nut  105 N, base  88  with interlocking groove  96  and mounting brackets  90 .  FIG. 30E  is a trailing or left side view of bottom module weather seal  5  showing rubber sleeve  106 , sleeve retainer  100 , sleeve retainer nut  105 N, and base  88  with mounting brackets  90 .  FIG. 30F  is an interior cross sectional view of bottom module weather seal  5  showing rubber sleeve  106 , sleeve retainer  100 , sleeve retainer nut  105 N, sleeve retainer washer  105 W, sleeve retainer bolt  105 B and base  88 . 
     FIG. 31A  is a top plan view of bottom module weather seal  5  base  88  showing interlocking groove  96 , retainer bolt hole  92 , retainer bolt head counter bore  94  and mounting brackets  90 .  FIG. 31B  is a bottom plan view of bottom module weather seal  5  base  88  showing sleeve and retainer channel  98 , sleeve retainer bolt holes  92  and mounting brackets  90 .  FIG. 31C  is an interior front elevational view of bottom module weather seal  5  base  88  showing mounting brackets  90 .  FIG. 31D  is a leading side or right side elevational view of bottom module weather seal  5  base  88  showing interlocking groove  96 , sleeve and retainer channel  98  and mounting brackets  90 .  FIG. 31E  is a trailing side or left side elevational view of bottom module weather seal  5 , base  88  showing sleeve and retainer channel  98 , and mounting brackets  90 . 
     FIG. 32A  is a top plan view of bottom module weather seal  5  retainer  100  showing retainer bolt holes  101 .  FIG. 32B  is a bottom plan view of retainer  100  showing parallel seal channel ridges  103 , seal channel  102 , and sleeve retainer bolt holes  101 .  FIG. 32C  is a front elevational view of bottom module weather seal sleeve retainer  100  showing seal channel ridges  103  and sleeve retainer flange  104 .  FIG. 32D  is a leading side or right side elevational view of bottom module weather seal  5  sleeve retainer  100  showing seal channel ridges  103 , seal channel  102 , and sleeve retainer flange  104 . 
     FIG. 33A  is a top plan view of bottom module weather seal  5  rubber sleeve  106  showing retainer bolt holes  108 .  FIG. 33B  is a bottom view of bottom module weather seal  5  rubber sleeve retain  106 .  FIG. 33C  is a front elevational view of bottom module weather seal  5  rubber sleeve  106 .  FIG. 33D  is a leading or right side elevational view of bottom module weather seal  5  rubber sleeve  106 . 
   As shown in  FIG. 30F , rubber sleeve  106  is retained in sleeve and retainer channel  98  by sleeve retainer bolts  105 B inserted through base  88  sleeve retainer bolt holes  92 , sleeve retainer bolt holes  108  in rubber sleeve  106  and sleeve retainer bolt holes  101  in sleeve retainer  100 . Sleeve retainer washers  105 W and nuts  105 N compress sleeve retainer  100  sandwiching rubber sleeve  106  between sleeve retainer  100  and base  88  within sleeve and retainer channel  98 . As shown in  FIG. 3D , when installed into the sliding glass patio door the bottom module weather seal  5  located at the lowermost portion of pet access door panel  25  is lowered into lower track portion  29  of the sliding glass patio door. In so doing, rubber sleeve  106  of bottom module weather seal  5  is compressed over the guide rail in lower track  29  portion of the sliding glass patio door  21 , and into seal channel  102  between parallel seal channel ridges  103 . The flexible nature of rubber sleeve  106  causes the outer walls to bulge filling the channel in lower track portion  29  of the sliding glass patio door creating an effective weather seal. 
     FIGS. 34A–34D  show various views of assembled center module  3  configured in the preferred embodiment of the invention with a universal locking assembly  63  installed.  FIG. 34A  is a front elevational view of assembled center module  3  shown with access door  32  removed exposing universal locking assembly  63 , the latter including carrier vertical recess  34 , and vertical adjustment slot  48 .  FIG. 34B  is a top plan view of assembled center module  3 , the bottom plan view being identical.  FIG. 34C  is a trailing or left side elevational view of assembled center module  3  showing universal locking assembly catch  128  and associated vertical adjustment slot  24 .  FIG. 34D  is a leading or right side elevational view of assembled center module  3  showing a recess  30  and cavity  28  designed to accommodate externally mounted sliding glass patio door catches and mounting hardware. Universal locking assembly latch  116  is shown in vertical adjustment slot  26  in  FIG. 34D . 
     FIG. 35A  is a front or interior side view of universal locking assembly  63  and  FIG. 35B  is a top view of universal locking assembly  63 . Catch loop  128  is an integral part of floating catch  124  and is held in place by catch loop rivets  129  as shown in FIGS.  35 A–B and  41 A–C.  FIG. 41D  shows floating catch  124  as a steel blank which is formed along indicated fold lines. Once formed, catch loop  128  is held together by rivets  129  in rivet holes  131  as shown in  FIGS. 41C and 41D . Vertical adjustment knob  132 , as shown in  FIGS. 35A–B , is designed to tighten and hold universal locking assembly  63  in place or loosen to allow vertical movement and adjustment of universal locking assembly  63  (see  FIG. 47B ). Vertical adjustment knob  132  consists of a grip portion  133 , a hub portion  134  and a threaded stud portion  135  as shown in  FIGS. 44A–C . The threaded portion  135  of vertical adjustment knob  132  fits through lateral float slot  126  in floating catch  124  shown in  FIG. 41A , and through carrier  136   FIGS. 35B ,  42 ,  43  and  45 A–C. The threaded portion  135  of vertical adjustment knob  132  fits through carrier nut hole  138  in carrier nut hole collar  139  of carrier  136 ,  FIG. 45A . After passing through lateral float slot  126  in floating catch  124  and carrier nut hole  138  in carrier nut hole collar  139  of carrier  136 , threaded portion  135  of vertical adjustment knob  132  is inserted through vertical adjustment slot  48  in center module  3  of the invention as shown in  FIG. 34A . After inserting threaded stud  135  of vertical adjustment knob  132  through lateral float slot  126  of floating catch  124  and carrier nut hole  138  in carrier nut hole collar  139  of carrier  136 , the subassembly is placed onto the front or interior side of center module  3 . Catch loop  128  of floating catch  124  is inserted through vertical adjustment slot  24  in the left or trailing side of center module  3  as shown in  FIG. 34C . The subassembly consisting of carrier  136 , floating catch  124  and vertical adjustment knob  132  is placed against the interior side of center module  3  on a lateral plane with carrier  136  seated in vertical carrier recess  34  of center module  3 . In so doing, threaded portion  135  of vertical adjustment knob  132  and vertical adjustment guide tabs  140  of carrier  136 ,  FIGS. 45A–C , are inserted through vertical adjustment slot  48  within vertical carrier recess  34  on the interior side wall of center module  3  and threaded into carrier nut  142 , which is located in vertical adjustment slot  48  on the opposite side of interior side wall  123  of center module  3 , as shown in partial cross sectional view  FIG. 43 . 
   With reference to  FIGS. 47A–C , when vertical adjustment knob  132  is turned counter clockwise it is loosened and permits universal locking assembly  63  to move vertically in vertical adjustment slot  48  in the interior side wall of center module  3 . This vertical movement is necessary so that the universal locking assembly may be adjusted to align with various latch and catch mechanism locations as produced by various sliding glass patio door manufacturers. When installing the preferred embodiment of the invention with universal locking mechanism, it is necessary to align the catch loop  128  of floating catch  124  of universal locking assembly  63  with latch  97  in leading side frame  15  of movable sliding door  21 , as shown in  FIGS. 47A and 47B . When catch loop  128  in floating catch  124  of universal locking assembly  63  has been aligned with latch  97  in leading side frame  15  of movable sliding door  21  universal locking assembly can be locked in place by turning vertical adjustment knob  132  in a clockwise direction as shown in  FIG. 47B . In so doing, vertical adjustment knob  132  engages and pulls carrier  136  and carrier nut  142  together in a vice like action trapping the interior side wall  123  of center module  3 , as shown in  FIG. 43 . This vice like action prevents universal locking assembly  63  from moving on a vertical plane, thereby keeping catch loop  128  in floating catch  124  aligned with latch  97  in leading frame  15  of movable sliding door  21  to permit latch  97  to engage catch loop  128 , whenever movable sliding door  21  is opened and closed as shown in  FIG. 47B . Carrier  136  has a channel  137  formed by side walls. This channel is designed to contain and guide floating catch  124 . Lateral float slot  126  fits over carrier nut hole collar  139  allowing floating catch  124  to travel on a lateral plane within channel  137  of carrier  136 . When vertical adjustment knob  132  is turned clockwise to pull carrier  136  and carrier nut  142  together against interior side wall  123  of center module  3 , vertical adjustment knob hub  134  seats against carrier nut hole collar  139 , and not against floating catch  124 , permitting floating catch  124  to travel laterally the distance permitted by the length of lateral float slot  126 , when universal locking assembly  63  is locked in place as shown in  FIG. 43 . In addition to catch loop  128 , catch loop rivets  129  and lateral float slot  126  floating catch  124  also has a threaded lateral adjustment knob hole  125 , and the side walls form a channel  127  as shown in  FIG. 41A . 
   Latch assembly  109 , as shown in FIGS.  35 A–B and  36 A–C, is attached to floating catch  124  by lateral adjustment knob  130 . Latch bar  110  of latch assembly  109 ,  FIGS. 36A–B , fits into channel  127  of floating catch  124  as shown in  FIGS. 35A–B . With latch bar  110  of latch assembly  109  seated within channel  127  of floating catch  124 , the threaded portion  135  of lateral adjustment knob  130  (see  FIG. 44A ) is inserted through lateral adjustment slot  111  in latch bar  110  of latch assembly  109  (see  FIG. 36A ), and threaded into threaded lateral adjustment knob hole  125  in floating catch  124 . When vertical adjustment knob  130  is turned in a clockwise direction, it threads into threaded vertical adjustment knob hole  125  in floating catch  124 , and vertical adjustment knob hub  134  of vertical adjustment knob  132  (see  FIG. 44A ), is tightened against latch bar  110  of latch assembly  109  locking it in place onto floating catch  124 , as shown in  FIGS. 35A–B . In order to accommodate the various latch and catch mechanism locations on sliding glass patio doors  21  as produced by various manufacturers, a degree of lateral adjustment is necessary. In particular, the type and mounting configuration of sliding glass patio door latch and catch mechanisms varies relative to the distance between the sliding patio door latch and catch. When lateral adjustment knob  130  is loosened, latch assembly  109  can be adjusted on a lateral plane to extend or retract with the distance of travel limited by the length of lateral adjustment slot  111  in latch bar  110  of latch assembly  109  to engage either a flush mounted sliding glass patio door catch as shown in  FIGS. 47A–B , or an externally mounted catch as shown in  FIG. 47C . 
   Latch assembly  109  consists of latch bar  110 , latch  116 , latch rivet  121  and latch spring  122  (see  FIG. 36A ). The latch bar  110  is a steel blank cut and formed to provide a lateral adjustment slot  111 , latch spring retainer  112 , latch rivet hole  114  and latch guide and stop  113  (see  FIG. 37A ). The latch  116  is fastened to latch bar  110  by rivet  122  through rivet hole  120  in latch  116  and rivet hole  114  in latch bar  110 . Latch spring  121  is held in place within latch spring retainer  112  by latch arm spring guide  118  in latch arm  117  (see  FIGS. 38A and 38B ). When latch arm  117  is pulled against latch bar  110 , spring  121  is compressed and latch  116  pivots on rivet  122  with a lever action. This lever action causes latch notch portion  119  of latch  116  to rotate away disengaging from sliding glass door catch  99  (see  FIG. 47A–B ) or catch  107  (see  FIG. 47C ), permitting the present pet door  25  to be removed from the sliding glass patio door  21 . During installation of the pet door  25 , the latch spring  121  pushing against latch arm  117  of latch  116  allows latch  116  to drop down and snap back into place engaging catch  99  (see  FIG. 47A–B ) or catch  107  (see  FIG. 47C ). As shown in  FIGS. 47B  and C, once aligned and engaged with sliding glass patio door latch  97  and either catch  99  or  107 , universal locking assembly  63  forms a steel bridge between the original equipment manufacturers patio door latch and catch. As noted earlier, lateral float slot  126  allows floating catch  110  to float in channel  137  around carrier nut hole collar  139  of carrier  136 . This floating feature eliminates any stress on pet door panel  25  when attempt is made to open movable sliding door  21  while locked, whereby all energy is transferred directly between the original equipment manufacturers latch and catch. 
   In a preferred embodiment of the invention, the bottom module  4  contains a pet portal assembly  146 , as shown is  FIGS. 1–3 .  FIG. 48  shows various views of assembled bottom module  4  with pet portal assembly  146  removed.  FIG. 48A  is a front or interior view of assembled bottom module  4  with pet portal assembly  146  removed. With pet portal assembly  146  removed seating flange  212  and frame mounting holes  213  are as shown in  FIGS. 48A and 49A . Except for removal of pet portal assembly  146   FIGS. 48A–D  and  FIGS. 49A–E  are the same as  FIGS. 15A–D  and  FIGS. 16A–E , and reference is made to these figures for a detailed description of bottom module  4 . 
     FIG. 49F  is an exploded assembly leading side view of pet portal assembly  146  (see  FIG. 1 ) and a partial cross sectional leading side view of bottom module  4 . Floating seal spring  160  fits onto an appendage on the bottom of floating seal  158 . The bottom portion of this two component subassembly are placed into a cavity located in the uppermost portion of portal opening  152  (see  FIGS. 48A and 49A ), or a cavity located in the lowermost portion of portal opening  152  in bottom module  4  then rotated into place as shown in  FIG. 49F . The terms top and bottom regarding bottom module  4  are relative terms since bottom module  4  may be rotated about a horizontal axis to increase or lower the height of the pet portal assembly to accommodate pets of various sizes. With floating weather seal spring  160  and floating weather seal  158  installed into bottom module  4 , flap assembly  162  and flap lock cam  169  along with floating weather seal  158  are placed between frame  172  from the interior side, and frame  172  from the exterior side after gaskets  170  have been applied to the pet portal assembly seating flange on the interior and exterior sides of bottom module  4 . Interior frame  172  and exterior frame  172  are identical, and bolted together using carriage bolts  178  and nuts  179  with frame gaskets  170 , flap lock cam  169 , flap lock assembly  162 , and floating weather seal  158  sandwiched in between within opening  152  of bottom module  4 , as shown in trailing side partial cross sectional view of  FIG. 49G . After the interior and exterior frames  172  are bolted in place, flap lock knob  176  is attached to flap lock cam shaft  169 , and flap lock cam shaft hole plug  174  is placed in the exterior frame  172 . This configuration suspends flap assembly  162  from flap lock cam  169 . Flap lock cam  169  is located in upper hinge  163  (see  FIG. 49G ) of flap assembly  162 , and held in place by interior frame  172 . Flap lock cam  169  shaft passes through a tubular protrusion in interior frame  172 , and is attached to flap lock knob  176 . When flap lock knob  176  is turned in a clockwise direction flap lock cam  169  is rotated up lifting upper hinge  163  and flap assembly  162  as indicated by directional arrows  153  and shown in  FIGS. 50D  and E.  FIG. 49H  is an enlarged trailing side partial cross sectional view of the lowermost pet portal assembly and bottom module  4 . This view shows magnet  159  installed in floating weather seal  158  along with floating weather seal spring  160  and flap magnet  168  installed in flap  166 . When the flap lock cam  169  is rotated up, flap  166  of flap assembly  162  is lifted out from between interior frame  172  and exterior frame  156  at the lowermost portion of pet portal opening  152  in bottom module  4 , as shown in  FIG. 50D . As flap  166  is lifted up from between frames  172 , magnet  168  in flap  166  assisted by floating seal spring  160  pulls floating weather seal  158  up and against the lowermost portion of flap  166 , as indicated by directional arrows  167  and  185  and shown in  FIGS. 49I ,  50 D and F. 
   Flap  166  is attached to lower hinge  165  (see  FIGS. 53A–B ), and lower hinge  165  is hinged to upper hinge  163  (see  FIGS. 52A–B ), by hinge pin  164  as shown in  FIG. 49G . This hinged arrangement permits flap  166 ,  FIGS. 54A–B  to swing about a horizontal axis as indicated by directional arrow  171  and as shown in  FIGS. 49J  and K. As a pet pushes flap  166  open the magnetic pull between flap magnet  168  and floating weather seal magnet  159  is broken allowing floating weather seal  158  to drop below frame  172  causing it to rest on spring  160  as shown in  FIG. 49K , and indicated by directional arrows  175  and  173  and as shown in  FIG. 49L . When flap lock knob  176  is turned counter clockwise, flap lock cam  169  is rotated down in upper hinge  163 , lowering flap  166  of flap assembly  162  down and between interior frame  172  and exterior frame  172  trapping an area  166 A of lowermost portion of flap  166  as shown in  FIGS. 50A–C . 
   In another embodiment of the invention bottom module  4  of pet door panel  25  is left as a blank with indented parallel surfaces as shown in  FIGS. 51A  and B. In this configuration most other conventional swinging door pet portals may be installed following the manufacturers instruction. 
     FIGS. 52A and 52B  show an interior front view and leading or right side view, respectively, of upper hinge  163 . Upper hinge  163  is designed to be two identical injection molded halves bonded together with integral cam follower compartment  177 , cam shaft slot  193  and hinge pin holders  195 . Lower hinge  165  has hinge pin holders  199  and flap rivet holes  201 , as shown in  FIGS. 53A  and B. Lower hinge  165  is designed to be two identical injection molded halves bonded together.  FIGS. 54A and 54B  show interior side and leading side views, respectively, of flap  166 . Flap construction should be of a composite fluted aluminum or plastic skin offering durability and optimum insulation quality. Location of flap magnet  168  is shown in the lowermost portion of flap  166 . 
     FIG. 55A  is an interior front view of bottom module  4  with pet portal assembly  146  installed configured for lowest rise and pet portal height in a right opening sliding glass patio door. After disassembling and removing pet portal assembly  146  as shown in  FIG. 55B , the height of the pet portal may be increased by rotating bottom module  4  about a horizontal axis as shown in  FIG. 55C , then reassembling and installing pet portal assembly  146  as shown in  FIG. 55B . After reassembling and installing pet portal assembly  146  the reconfigured door with increased pet portal height should appear as shown in  FIG. 55D . 
   When reconfiguring the pet door panel for a left opening sliding glass patio door assembled top module weather seal  1  and top module  2  (see  FIG. 3C ) are rotated about a vertical axis. Changing the center module  3  requires rotation of the module 180 degrees about the horizontal axis. In order to reconfigure the bottom module  4  with pet portal  146  installed from a right opening to left opening sliding glass patio door pet portal assembly  146  must be disassembled and removed from bottom module  4  as shown in  FIG. 55B . Once pet portal assembly  146  is removed, the bottom module  4  is rotated 180 degrees about a vertical axis as shown in  FIG. 56A . The reconfigured bottom module  4  for left opening sliding glass patio door should appear as shown in  FIG. 56B . 
   The handlebar of drop lock  6  is attached to the trailing side of frame  15  of movable sliding door  21  at locking bracket  202  as shown  FIG. 57A .  FIG. 57A  is an interior side view of a sliding glass patio door with pet door panel  25  and drop lock  6  installed. A hinge pin joins the handlebar and adjustable housing so that the adjustable housing may be dropped into the lower channel portion  29  of the sliding glass patio door with the handlebar at a 90 degree angle going up the trailing side of door frame  15  of movable sliding door  21 . 
   Handlebar handle  181  (see  FIG. 58A ) is inserted through locking bracket  202  prior to attachment to the trailing side of door frame  15  on movable sliding door  21  using self stick adhesive tape  205  on the back of mounting flange  206  shown in  FIGS. 57C and 57E . With the adjustable housing  188  adjusted and lower track guide rail channel  189  in place in lower channel portion  29  of the sliding glass patio door between the upright portion of sliding patio door frame  11  and the trailing side of door frame  15  of movable sliding door  21  as shown in  FIG. 57A , handlebar  180  is rocked away from door frame  15  as indicated by directional arrow  216  shown in  FIG. 58K  and moved into locking detent  203  as shown in  FIGS. 57B and 57C . This step causes a rubber bumper  186  (see  FIG. 58A ) attached to the lowermost portion of handlebar  180  by hinge pin  184  just below the fulcrum to move as indicated by directional arrow  217  and push against the lowermost portion of the trailing side of door frame  15 , at the point indicated by arrow  218 , of movable sliding door  21  acting as a type of wedge as shown in  FIG. 58K . In order to open the sliding glass patio door  21  handlebar  180  must be moved from locking detent  203  to neutral detent  204  of locking bracket  202  as shown in  FIGS. 57D and 57E . Handlebar  180  is moved back to neutral detent  204  as indicated by directional arrow  216  shown in  FIG. 58E . This moves the rubber bumper  186  attached to the lowermost portion of handlebar  180  by hinge pin  184  just below the fulcrum to move, as indicated by directional arrow  217 , away from the trailing side of door frame  15  at the point indicated by arrow  218  as shown in  FIG. 58E , allowing handlebar  180  to be lifted and raised to storage bracket  208 , where the handlebar handle  181  rests on top of and in between containment forks  210  as shown in  FIGS. 57G and 57H . In so doing, the adjustable housing  188  and lower track guide rail channel  189  are lifted out of lower channel portion  29  onto the trailing side of door frame  15  of movable sliding door  21 , for storage as shown in  FIG. 57F  so that movable sliding door  21  may be opened. 
     FIG. 58A  is an interior side elevational view of drop lock  6 .  FIG. 58B  is a left or trailing side elevational view of drop lock  6 .  FIG. 58C  is a right or leading side elevational view of drop lock  6 . Approximately one inch of the uppermost portion of handlebar  180  is bent on a 90 degree angle to form handlebar handle  181  as shown in  FIGS. 58A–58C . Handlebar  180  is attached to housing  188  by hinge pin  182  as shown in  FIG. 58D  which allows the hinge to swivel in excess of 90 degrees within handlebar slot  187  of adjustable housing  188  while allowing handlebar  180  and lower track guide rail channel  189  of adjustable housing  188  to lie flat against the trailing side of door frame  15 , when drop lock  6  is in storage as shown in  FIG. 57F . Rubber bumper  186  is attached to the lowermost portion of handlebar  180  just below the fulcrum created by the joining of handlebar  180  and housing  188  at hinge pin  182  as shown in  FIGS. 58A–58E . Telescoping adjustment slide pin  190  fits through one of two holes  191  in housing  188  and into equidistant adjustment holes  222  in telescoping adjustment slide  192  to lock in larger incremental adjustments as shown in  FIGS. 58F ,  58 G and  58 H. When the telescoping adjustment slide  192  and housing  188  have come close to filling the gap between the upright portion of sliding glass patio door frame  11  and the trailing side of door frame  15  of movable sliding patio door  21 , a finer final adjustment is accomplished by rotating adjustment grip and bumper  200  clockwise as shown in  FIG. 58I , in turn unscrewing threaded fine adjustment rod  198  in threaded coupling  194  attached to telescoping adjustment slide  192  by coupling retainer pin  196  and coupling retainer pin cotter pin  197  extending the fine adjustment mechanism to obtain a snug fit (see  FIGS. 58I and 58J ). An internally threaded coupling  194  is actively retained via a retaining pin  196  and cotter pin  197  within a free end of housing  188 , as shown, for receiving a threaded portion of rod  198 . 
     FIG. 59A  is a left side elevational view of a ramp or platform resting board  220  showing ramp or platform resting board surface  224 , support side wall  227 , support legs  229  and attachment clasps  226 . Clasps  226  attach to mounting brackets  90  located on the bottom module weather seal  5  which is attached to the bottom module  4  of the pet access door panel as shown in  FIGS. 60A–60C .  FIG. 59B  is a top view of ramp or platform resting board  220  showing the ramp or platform resting board surface  224  and the attachment clasps  226 .  FIG. 59C  is a bottom view of ramp or platform resting board  220  showing the attachment clasps  226 , support side walls  227  and support legs  229 .  FIG. 59D  is a back side view of ramp or platform resting board  220  showing ramp or platform resting board surface  224 , attachment clasps  226 , support side walls  227  and support legs  229 .  FIG. 59E  is a front view of ramp or platform resting board  220  showing the ramp or platform resting board surface  224  and support legs  229 . 
     FIG. 60A  is an exploded assembly view of a partial left side elevational view of the lowermost portion of the pet access door panel showing bottom module  4  with bottom module weather seal  5  attached and a left side view of ramp or platform resting board  220 . Attachment clasps  226  on ramp or platform resting board  220  engage mounting brackets  90  on bottom module weather seal  5  in order to attach the two components together as shown in  FIG. 60B . The engagement of ramp or platform resting board clasps  226  and bottom module weather seal brackets  90  provide a hinge arrangement that permits ramp or platform resting board  220  to be raised or lowered and shown in  FIGS. 60C ,  60 F and  60 G. 
   In many sliding patio door installations there may be a step down upon egress through the pet portal in the pet access door panel as shown by arrow  91  in  FIG. 60D . Although  FIGS. 60D–60G  are exterior elevational views of a sliding glass patio door with the pet access door panel installed it should be understood that an elevated threshold in this installation may result in a step up or down upon ingress into the structure interior or egress to the structure exterior and, therefore, ramp or platform resting board  220  may be appropriate for use on the interior side of the pet access door panel and function in the same manner as shown in  FIGS. 60A–60G . Mounting brackets  90  located on the both the interior and exterior sides of bottom module weather seal  5  permits the interior or exterior use of ramp or platform resting board  220 .  FIG. 60E  is an exterior side elevational view of a sliding glass patio door with pet access door panel installed, and ramp or platform resting board  220  attached, allowing a pet to enter or exit a structure with a footing surface the same on either side of the pet portal in the pet access door panel even though there may be a step up or down.  FIGS. 60F and 60G  are exterior elevational views of a sliding glass patio door with pet access door panel installed and ramp or platform resting board  220  attached and being raised to an upright position to allow access to the surface under the ramp or platform resting board. 
   Although various embodiments of the invention have been shown and described, they are not meant to be limiting. Those of skill in the art may recognize various modifications to these embodiments, which modifications are meant to be covered by the spirit and scope of the appended claims. For example, the pet portal  146  can be installed in the lower portion of any door for ingress or egress of a pet with the door closed. Also, the drop lock  6  can be used with any typical sliding patio door.