# Patent

## Title
Convertible hard side shelter

## Abstract

A hard side shelter is convertible between transport and deployed modes. When in the transport mode, the shelter has an envelope identical to an ISO-cargo container. A side section floor and cover are each connected to the center section for rotating between being coplanar with the center section floor and roof when in the deployed mode, and being vertical and lying in a center section side planes when in a transport mode. Each side section has end and middle panels that are turnable relative to each other, and a door assembly that is turnable relative to the middle panels. Locking bars engaged the center section floor when the shelter is in a transport mode, and engage the side section floors when the shelter is in the deployed mode. The shelter is handleable by pallet handling systems and includes insulation panels to enhance the heat transfer characteristics of the shelter.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional of U.S. Ser. No. 10/957,473, filed on Oct. 4, 2004, now U.S. Pat. No. 7,874,107 the entirety of which is hereby incorporated by reference.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to portable shelters, and more particularly to hard side shelters that convert into different sizes for transportation and use.
2. Description of the Related Art
It is a well known practice to ship goods in International Standards Organization (ISO) containers. Such containers are very large, having nominal exterior dimensions of 19 feet 101⁄2 inches long, eight feet wide, and eight feet high. The containers have fixed floors, roofs, and ends. Access to the container interior is through folding doors on both sides. The doors are locked closed by locking bars that engage tabs in the container floor and roof. The containers include an end bar and rails under the floor that are part of known pallet handling systems.
In theory, ISO containers could be used as hard side shelters for persons and equipment. However, despite their large size, they nevertheless are too small for some shelter purposes. For example, there is a need for shelters that are suitable for repairing large motor vehicle tires in the field. As is known, maintaining the tires of motor vehicles is mandatory for successful operation of the vehicles. A particularly difficult problem associated with tire maintenance concerns military trucks. Those trucks often operate off-road, in rough terrain, and far from repair facilities. A tire failure could jeopardize not only the truck crew in hostile areas, but even the success of the mission of which the truck is a part.
Repairing military truck tires is a difficult task. The tires and their rims and wheels are very heavy, so they require mechanical assistance to handle them. Failures associated with heavy truck tires are varied and severe, so a wide variety of large and heavy repair equipment has to be available. Finally, it is vital that the repair equipment either be located close to where the tire damage occurs, or be able to quickly reach the location of the damaged truck. That means that the repair equipment must be able to travel with the trucks to remote and rugged places. Because of the size of the tire repair equipment and the working room required around them, conventional ISO containers are not suitable as tire repair workshops.
SUMMARY OF THE INVENTION
In accordance with the present invention, a hard side shelter is provided that converts between a transport mode and a deployed mode. This is accomplished by apparatus that includes a center section, and two side sections that selectively fold into and out of the center section.
The center section is preferably constructed with an envelope that is the size and shape of a conventional International Standards Organization (ISO) cargo container. When in the transport mode, the side sections fold into the center section such that the entire hard side shelter has the envelope of an ISO container. When in the transport mode, the convertible hard side shelter can be stacked, handled, and transported in the same way as ISO containers. When in the deployed mode, the side sections unfold from the sides of the center section to greatly increase the interior space available for personnel and equipment.
The center section is comprised of a sturdy frame having horizontal beams and vertical corner posts. The corner posts define vertical side planes and vertical end planes of the center section. The center section has a rigid roof and a rigid floor. At least one end of the center section has an opening and an end door. The second center section end may also have an opening and an end door, or the second end may be permanently closed. If the second end is permanently closed, the center section may include an end bar on the closed end and floor channels that enable the convertible hard side shelter to be handled by a conventional pallet handling system.
The center section end door may be a single end door or a double end door which can be vertical or horizontal double doors. The single end door is composed of a top door hinged to the frame near the roof and a bottom door hinged to the frame near the floor. The top and bottom doors pivot about respective horizontal axes. When the single end door is open, the top and bottom doors are generally horizontal and parallel to the center section roof and floor, respectively. When the single end door is closed, the top and bottom doors are vertical and lie in the associated center section end plane. The double end door is composed of the top and bottom doors hinged near the roof and floor, respectively, plus a pair of outer doors that are hinged to associated corner posts for pivoting about respective vertical axes. When the double end door is open, the top and bottom doors are horizontal and generally parallel to the center section roof and floor, respectively, and the outer doors are generally parallel to the side section side planes. When the double end door is closed, the top and bottom doors are vertical and lie generally in the associated center section end plane, and the two outer doors are also generally in the center section end plane and lie adjacent and outside of the top and bottom doors.
Each side section is comprised of a rigid floor, and a number of relatively turnable panels. In the preferred embodiment, the side section panels include a pair of larger end panels, to accommodate for the same width of the fold down rigid floor, a pair of smaller middle panels, and a door assembly. The side section floor is rotatably connected to the center section. Each end panel is turnably mounted along one edge thereof to a center section corner post. A second edge of each end panel is turnably mounted to a first edge of a middle panel. Second edges of the middle panels are turnably mounted to opposite edges of the door assembly. According to one aspect of the invention, the door assembly is comprised of first and second door frames. The first door frame contains one or more side doors that swing about respective vertical axes. The second door frame has a filler panel. The two door frames are attachable to and detachable from each other. Each of the end and middle panels and the door assembly has at least one locking door.
When the convertible hard side shelter is in the deployed mode, the side sections are outside of vertical side planes of the center section. Each side section floor is rotated to be generally coplanar with the center section floor. Each end panel is parallel to the center section end planes. The middle panels, as well as the door assembly, are perpendicular to the end panels. The locking bars engage the side section floors to lock the side sections rigidly to the center section. A cover extends from the center section roof to the top edges of the end and middle panels and the door assembly. Thus, each side section is a space bounded by the side section floor, two end panels, two middle panels, the door assembly, and the cover. The side sections are open to the interior of the center section. To maintain cleanliness inside the convertible hard side shelter from outside contaminants, the joints between the end panels and the center section corner posts, and the joints between the end and middle panels, are covered with flexible seals. When the convertible hard side shelter is in the deployed mode, personnel and equipment can enter and leave through the side section doors.
To convert the hard side shelter from the deployed mode to the transport mode, the covers are removed from over the side sections and allowed to hang vertically generally in the center section side planes. One edge of each side section door assembly is disconnected from the associated middle panel. If the door assembly has two door frames, the door frames are detached from each other instead of from a middle panel. The locking bars of the end and middle panels and the door assemblies are disengaged from the side section floors. The door assemblies are turned away from the center section such that they are not over the side section floors. Each side section floor is rotated to be parallel to and proximate a respective center section side plane. One or more winches may be used to assist rotating the side section floors. The winches are received in ISO locks in the center section corner posts. Slide locks or the like engage the center section frame to retain the side section floors vertical.
The door assemblies are then turned toward the center section and flat against the respective adjacent middle panels. The end and middle panels are turned to lie generally within a center section side plane and alongside the associated side section floor. The end and middle panels thus form the sides of the hard side shelter when it is in the transport mode. The locking bars on the end and middle panels then engage the center section frame to lock the end and middle panels to the center section frame. The result is a rigid hard side shelter having the envelope of an ISO cargo container. The convertible hard side shelter is then ready for handling and shipping in the same manner as an ISO container.
It is an important feature of the invention that the convertible hard side shelter is equipped with any of a wide variety of tools and machinery suitable to carry out particular desired tasks. For example, the convertible hard side shelter may be used as an office, kitchen, or medical station. A particularly important use for the convertible hard side shelter is as a tire maintenance workshop for heavy duty trucks. In that case, such items as an engine-driven generator, welding machine, air compressor, and tire repair tools are incorporated into the convertible hard side shelter. To assist moving such heavy items as the engine-generator set, the floor and bottom end door may have rails fixed to them. The engine-generator set is supported on a wheeled cart that rolls along the rails to locate the engine-generator set outside of the center section. Other tools and machinery may be arranged to fit entirely within the center section for transporting purposes and to be movable into the side sections when the hard side shelter is converted into the deployed mode.
In the preferred embodiment, a wall panel is built into the cart that supports the engine-generator set. The wall panel has peripheral seals that match the opening of the center section at the end door. When the cart is outside of the center section, the wall panel covers and seals the center section end opening. In that way, noise, dirt, and fumes associated with the outside environment and the engine-generator set are blocked from reaching inside the convertible hard side shelter.
The method and apparatus of the invention, using a center section that is based on a conventional ISO cargo container, thus enables a hard side shelter to be set up in the field. The convertible hard side shelter is convertible between a transport mode suitable for transporting, and a deployed mode suitable for a variety of functions such as a fully equipped tire maintenance workshop.
Other advantages, benefits, and features of the invention will become apparent to those skilled in the art upon reading the detailed description of the invention and studying the drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the front end and road side of the convertible hard side shelter in the transport mode;
FIG. 2 is a perspective view of the back end and curb side of the convertible hard side shelter in the transport mode;
FIG. 3 is a broken view of the curb side of the convertible hard side shelter in the transport mode;
FIG. 4 is a perspective view of the front end of the convertible hard side shelter with the road side section in the deployed mode and the curb side section in a partially deployed mode;
FIG. 5 is a view similar to FIG. 4 but showing the back end of the convertible hard side shelter;
FIG. 6 is a perspective view of the convertible hard side shelter in the fully deployed mode;
FIG. 7 is a broken top view of the convertible hard side shelter in the transport mode;
FIG. 8 is a broken top view of the convertible hard side shelter in the deployed mode;
FIG. 9 is a perspective view of the bottom of the convertible hard side shelter in the partially deployed mode;
FIG. 10 is a top view of the convertible hard side shelter showing it in the transport mode and equipped to function as a tire maintenance workshop;
FIG. 11 is a view similar to FIG. 10, but showing the convertible hard side shelter in the deployed mode;
FIG. 12 is a view similar to FIG. 5, but showing an open double end door of the center section;
FIG. 13 is a view similar to FIG. 2 but showing the double end door of FIG. 12 closed;
FIG. 14 is a broken perspective view showing the wall panel mounted to the cart that supports the engine-generator set;
FIG. 15 is a cross-sectional view on an enlarged scale taken along line 15-15 of FIG. 7;
FIG. 16 is a perspective view showing winches used to assist rotating the side section floors;
FIG. 17 is a partial cross-sectional view similar to FIG. 15, but showing the cover of the invention in the deployed mode;



DETAILED DESCRIPTION OF THE INVENTION
Although the disclosure hereof is detailed and exact to enable those skilled in the art to practice the invention, the physical embodiments herein disclosed merely exemplify the invention, which may be embodied in other specific structure. The scope of the invention is defined in the claims appended hereto.
General
Referring first to FIGS. 1-3, a convertible hard side shelter 1 is illustrated that includes the present invention. The convertible hard side shelter 1 is particularly useful for performing heavy duty repair work at remote locations. However, it will be understood that the invention is not limited to maintenance related applications. On the contrary, the invention is also eminently suitable for such diverse uses as food preparation, medical procedures, restrooms, and offices. In FIGS. 1-3 and 7, the convertible hard side shelter 1 is shown in a transport mode. FIGS. 6, 8, and 9 show the convertible hard side shelter in a deployed mode, as will be fully explained. In the preferred embodiment, the convertible hard side shelter 1, when in the transport mode, has the exterior dimensions of a conventional International Standards Organization (ISO) cargo container. In the case, the convertible hard side shelter has an exterior length of 19 feet 101⁄2 inches, a height of eight feet, and a height of eight feet. When in the transport mode, the convertible hard side shelter is handleable by a conventional pallet handling system as are known to persons working in the cargo container industry. Further, the convertible hard side shelters in the transport mode are stackable in the same way as conventional ISO cargo containers. To convert it from the transport mode to the deployed mode, the convertible hard side shelter 1 has a curb side section 3 and a substantially identical road side section 5. The side sections 3 and fold and unfold relative to a center section 7. When the side sections are folded into the center section 7, the convertible hard side shelter has the exterior dimensions of an ISO cargo container mentioned above.
Center Section
The center section 7 is comprised of a sturdy frame 9 having horizontal and vertical beams. Looking especially at FIGS. 4 and 9, the particular frame 9 has bottom longitudinal beams 11, bottom transverse beams 13, top longitudinal beams 17, and top transverse beams 19. The frame further has four corner posts 15A, 15Bi 15C, and 15D collectively referred to as reference numeral 15. The corner posts 15A, 15D and 15B, 15C define opposed vertical side planes of the center section that are indicated by reference numerals 20, FIG. 7. The corner posts 15A, 15B and 15C, 15D define center section end planes 22. A rigid floor 21 covers the bottom beams 11 and 13. A rigid roof 23 with an overhang covers the top longitudinal beams 17 and 19. It is a feature of the convertible hard side shelter 1 that it is compatible with known pallet handling systems or load handling systems. For that purpose, the front end 24 of the center section 7 is manufactured with a strong bar 25 supported on its opposite ends by an A-frame 27. Preferably, the A-frame 27 terminates at vertical beams 29 that tie into a top transverse beam 19. The front end 24 of the center section is closed by a wall 34.
Also parts of the convertible hard side shelter 1 are a pair of channels 30 under the frame bottom transverse beams 13. The channels 30 are spaced and configured to suit conventional pallet handling systems. The channels cooperate with the bar 25 to enable efficient handling of the convertible hard side shelter by known pallet handling machinery. The back end 31 of the center section 7 is designed with an end opening 32 to provide access to the interior of the convertible hard side shelter 1, FIG. 5. In the illustrated construction, there is an end door 33 at the opening 32. The end door 33 is comprised of a top door 35 that is hinged to a frame top transverse beam 19 for pivoting about a horizontal axis. A bottom door 37 is hinged to a frame bottom transverse beam 13 for pivoting about another horizontal axis. When the top and bottom doors 35 and 37, respectively, are open, they are generally parallel to the roof 23 and floor 21. When the doors 35 and 37 are open, the bottom door is held in place by heavy chains 38 secured to the frame 9. The top door is held open by gas-activated shock absorbers 42. When the top and bottom doors are closed, they lie generally in the center section end plane 22. Both doors are locked in place when closed by associated locking bars 39. The locking bars 39 may be constructed along the lines of the locking bars used on the doors of semi-trailers used in the trucking industry. The locking bars selectively engage and disengage tabs, not shown, on the frame corner posts 15.
Cover
Turning briefly to FIGS. 5, 7, and 15, the convertible hard side shelter 1 comprises a cover 66 associated with each side section 3 and 5. Each cover 66 has a heavy tarp 78 hung from the top longitudinal beam 17 by suitable small plates and fasteners 80. A long angle 18 is fastened to the tarp 78 at a distance from the top beam. Several C-clamps, not shown in FIG. 5, 7, or 15, are built into the angle 18.
Side Sections
Looking especially at FIGS. 4-6, 8, and 9, the curb side section 3 and road side section 5 are comprised of a number of vertical panels collectively indicated at reference numeral 38 that are turnably mounted to each other. The curb side section and road side section are substantially identical. Accordingly, the following description of the curb side section is deemed adequate to also describe the road side section.
The panels 38 include a pair of end panels 40, a pair of middle panels 41, and a door assembly 43. Each side section 3 and 5 also has a rigid floor 44. Each end panel 40 has a first edge 45 that is turnably mounted to a center section corner post 15. A second edge 47 of each end panel is turnably mounted to a first edge 49 of a middle panel 41. A second edge 51 of each middle panel is turnably mounted to an opposite edge 53 or 55 of the door assembly 43. The floor 44 is connected to the center section, such as to frame bottom longitudinal beam 11, for rotating about a horizontal axis 26.
In the illustrated construction, the door assembly 43 is made up of a first door frame 57 and a second door frame 59. The first door frame 57 has a filler panel 60. The second door frame 59 is depicted as having two side doors 69 that swing about respective vertical axes, but a single side door is also within the scope of the invention. If desired, one of the side doors 69 may be a bi-fold door. The first door frame 57 has the door assembly edge 53, and the second door frame has the door assembly edge 55. As illustrated, the first door frame has a second edge 61, and the second door frame has a second edge 63. The door assembly also includes latches 70 between the first and second door frames. The latches 70 enable the two door frame edges 61 and 63 to attach to and detach from each other.
The floor 44, the pairs of end and middle panels 40 and 41, respectively, and the door assembly 43 of each side section 3 and 5 are foldable to convert the convertible hard side shelter 1 between the transport and deployed modes. Each of the end and middle panels and door assemblies has at least one locking bar 65. The locking bars 65 may be constructed generally along the lines of the locking bars 39 used on the center section end doors 35 and 37. To prevent contaminants from passing between the center section corner posts 15 and the end panel edges 45, flexible but massive seals, partially shown at reference numeral 68, cover the joints between the corner posts and the end panel edges 45. Similar seals, partially shown at reference numeral 71, cover the joints between the end panel edges 47 and the middle panel edges 49.
As mentioned, FIGS. 6, 8, and 9 show the convertible hard side shelter 1 in the deployed mode. In the deployed mode, the entire side sections 3 and 5 are outside of the center section side planes 20. Specifically, the end panels 40 are parallel to the center section end plane 22. The middle panels 41 are perpendicular to the end panels. The door assembly edges 61 and 63 are attached to each other, and the door assembly 43 is coplanar with the middle panels. The side section floor 44 is rotated about the horizontal axis 26 to be coplanar with the center section floor 21. The locking bars 65 engage tabs in the side section floor to lock the end and middle panels and the door assembly to the side section floor. As a result, the side sections 3 and 5 become rigid with the center section 7. The seals 68 and 71 prevent outside contaminants from entering the convertible hard side shelter through the joints between the center section center posts 15 and the end panels, or through the joints between the end and middle panels.
The cover 66 is extended between the center section roof 23 and the common top edges 67 of the end and middle panels 40 and 41, respectively, and the door assembly 43. FIG. 17 shows the cover in the deployed mode. The tarp 78 is wrapped upwardly against the top longitudinal beam 17, and the angle 18 is secured to the roof overhang by means of several C-clamps 82 that are built into the angle. Three free edges of the tarp are folded over the top edges 67 of the end and middle panels and door assembly and held in place, such as with hook and eye fastening tape.
When in the deployed mode, a preferred embodiment of the invention has a total exterior width of approximately 19 feet eight inches. The convertible hard side shelter 1 in the deployed mode thus provides a sealed interior space that is much larger than the interior space of the center section 7 alone. Access to the interior is through the end door 33 and the side doors 69 in the second door frame 59.
Conversion
To convert the convertible hard side shelter 1 from the deployed mode of FIGS. 6, 8, and 9 to the transport mode of FIGS. 1-3 and 7, the covers 66 are removed from the side section end panels 40, middle panels, 41, and door assembly 43. The C-clamps 82 are removed from the roof 23, and the tarp 78 is allowed to hang vertically, FIG. 15. The locking bars 65 are disengaged from the side section floor 44. The door assembly edges 61 and 63 are detached from each other. The end panels, middle panels, and door assembly are turned so as to not overlie the side section floors 44. Each side section floor is rotated upwardly to lie parallel to and proximate a vertical side plane 20. Alternatively, the floors 44 can be manually lowered with removable hand crank winches 84 that are fastened to the center of the roof 23 halfway between the forward wall and the rear wall for even distribution of the rigid floor. To assist rotating the side section floor, one or more winches 84 may be employed. See FIG. 16. The winches 84 are received in known ISO locks at the top ends of the corner posts 15. Flexible cables 86 from the winches are removably hooked to the side section floor.
To retain the side section floor 44 vertical, it is provided with conventional slide locks 72. As seen in FIG. 15, the slide locks 72 engage the top longitudinal beam 17. However, the slide locks may engage the corner posts 15 instead, if desired. After the side section floor is properly retained, the cables 86 are unhooked from the floor, and the winches 84 are removed from the ISO locks. The winches and cables are also used to rotate the side section floors downwardly when the convertible hard side shelter 1 is converted back to the deployed mode.
The first door frame 57 is turned toward the center section 7 to lie flat against the adjacent middle panel 41. The other door frame 59 is turned to lie flat against the other middle panel. The middle panels are turned to be coplanar with the end panels 40. The end panels are turned on the center section corner posts is to lie alongside the associated side section floor 44. FIG. 15 shows heavy seals 101 on the end and middle panels that abut the top longitudinal beam 17.
The entire door assembly 43 thus lies generally within the center section side plane 20. Then the locking bars 65 are engaged with tabs 76 in the center section longitudinal beams 11 and 17. The end and middle panels 40 and 41, respectively, thus lock to the center section 7 and become rigid sides for the center section, and the entire convertible hard side shelter 1 has the envelope of an ISO container, FIG. 7. The convertible hard side shelter is then in the transport mode, ready to be handled by conventional pallet handling systems for stacking, shipping, and other handling operations.
Fire Maintenance Workshop
The convertible hard side shelter 1 is suitable for a wide variety of purposes. For example, it may be used to shelter military personnel at remote locations. It also is eminently useful for storing equipment and supplies at a remote site. An especially important use of the convertible hard side shelter is as a tire maintenance workshop. Looking at FIG. 10, the convertible hard side shelter is shown in the transport mode and equipped with machinery and tools for repairing heavy duty truck tires. The machinery may include a tire mounter and demounter schematically represented at reference numeral 73. Other machinery includes a press 75, air compressor 77, air reservoir 79, engine-generator set 81, safety cage 83, and tool box 85. In addition, such auxiliary equipment as a heat pump 87 can be incorporated into the convertible hard side shelter. Other infrastructure may include a fluorescent lighting system and an overhead crane or a jib crane built into the center section 7.
It is an important feature of the invention that some of the tire maintenance equipment is permanently installed in the convertible hard side shelter 1. For instance, in FIG. 10 the tire mounter and demounter 73 is installed to the center section floor 21 try a pivot pin 89. The press 75 is installed to the floor by another pivot pin 91. The pivot pins 89 and 91 enable the tire mounter and demounter and the press, respectively, to be permanently located within the center section 7, but to have different angular positions. 10 FIG. 10, all the equipment is shown in a storage location, fitting completely within the center section.
In FIG. 11 the convertible hard side shelter 1 is shown in the deployed mode, and the tire maintenance equipment is shown in their working locations. Specifically, the tire mounter and demounter 73 are rotated 90 degrees about the pivot pin 89 relative to its stored location of FIG. 10. Similarly, the press 75 is at 90 degrees about its pivot pin 91 relative to its stored position. FIG. 11 also shows a pair of rails 93 fixed to the center section floor 21 and matching rails 92 on the bottom door 37. The engine-generator set 81 is placed on a wheeled cart 94 that rolls along the rails 92 and 93.
The extra space provided by the side sections 3 and 5 enables the tire repair equipment to be spaced apart and thereby provide ample working space for personnel performing tire maintenance. On the other hand, when the tire repair operations are needed at a different place, the equipment is returned to the storage locations of FIG. 10 for safe and efficient transport. A particularly important aspect of the present invention is that the center section opening 32 is coverable even when the end door 33 is open. Turning to FIG. 14, the center section back end 31 is shown with the end door open, thus providing access to the interior or the convertible hard side shelter 1. For clarity, the top door 35 is not shown. The cart 94 for the engine-generator set 81 (not illustrated in FIG. 14) is rolled onto the bottom door 37 along the rails 92 and 93. To cover the opening 32, a wall panel 96 is built into the cart 94 and rolls with it. The wall panel 96 has a size and shape that substantially matches the opening 32. When the cart is rolled onto the bottom door, the wall panel covers the opening 32. A seal 99 around the wall panel periphery helps to seal the interior of the convertible hard side shelter 1 from the noise and fumes of the engine-generator set 81 as well as from atmospheric pollutants.
Alternate Embodiments
As described thus far, the convertible hard side shelter 1 is constructed with the bar 25 and channels 30 that enable it to be handled by a conventional pallet loading system. The versatility of the invention is such that both center section ends 24 and 31 may be provided with end doors 33, thereby eliminating the bar 25. FIGS. 12 and 13 show a convertible hard side shelter 1′ according to a second embodiment of the invention. The convertible hard side shelter 1′ is constructed with a double end door 95 at both ends 24 and 31. It will be understood, of course, that a double end door 95 may be at only one end 24 or 31, if desired. The double end door is comprised of top and bottom doors 35′ and 37′, respectively, that may be substantially identical to the doors 35 and 37 described previously in connection with FIGS. 1-11. The double end door further comprises a pair of outer doors 97. Each outer door 97 is hinged to an associated corner post 15 for pivoting about a respective vertical axis. Each outer door includes at least one locking bar 65.
FIG. 12 shows the double end doors 95 open. In that situation the top doors 35′ are generally parallel to the center section roof 23, the bottom doors 37′ are generally coplanar with the center section floor 21, and the outer doors 97 are generally parallel to the center section side planes 20 (FIG. 8). FIG. 13 shows the double doors closed. The top and bottom doors 35′ and 37′, respectively, are vertical and are within the center section end planes 22. The outer doors are also generally within the end planes 22 and lie adjacent and outside of the top and bottom doors. The locking bars 65 securely lock the outer doors to the center section beams 13 and 19. The double end doors thus effectively seal the interior of the convertible hard side shelter 1′ from outside contaminants such as sand and fumes.
CONCLUSION
In summary, the results and advantages of pallet handling systems for ISO cargo containers can now be more fully realized. The convertible hard side shelter provides both the ability to be transported and stored in the manner of ISO containers as well as to be converted into an expanded space for storing and working. This desirable result comes from using the combined functions of the side sections 3 and 5. When in a transport mode, the side sections fold so as to form the sides of the center section 7 having the same exterior envelope as an ISO container. A floor 44 of each side section lies vertically alongside the folded end and middle panels 40 and 41, respectively. The end and middle panels include locking bars 65 that engage the center section frame 9. The center section may include the bar 25 and channels 30 used with conventional pallet handling systems. When in a deployed mode, the side sections unfold. The side sections floors rotate to be coplanar with the center section floor 21. The end and middle panels and the door assemblies 53 lock to the side section floors to render the side sections rigid with the center section. Access to the interior of the convertible hard side shelter is through the side doors 69. The convertible hard side shelter is ideal for use as a portable tire maintenance workshop.
It will also be recognized that in addition to the superior performance of the convertible hard side shelter, its construction is such as to provide increased economy related to the transportation and storage of personnel and equipment. Also, because it follows a simple and rugged design, the convertible hard side shelter gives many years of service life with but minimal maintenance.
Thus, it is apparent that there has been provided, in accordance with the invention, a convertible hard side shelter that fully satisfies the objects, aims, and advantages set forth above. While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.

## Claims

1. A method of sheltering persons and equipment comprising the steps of:
a. providing a center section having a front end and an open back end that define respective vertical front and back end planes, and opposed first and second sides that define respective first and second vertical side planes, and having a rigid floor, corner posts, and a rigid roof;
b. folding first and second side sections to lie generally within the center section first and second side planes, respectively, to close the center sections first and second sides and cooperate with the center section floor, roof, and ends to make a shelter that is in a transport mode; and
c. unfolding the first and second side sections to be substantially outside of the center section first and second side planes, respectively, and cooperate with the center section to convert the shelter into a deployed mode,

wherein the step of folding the first and second side sections comprises the steps of:
i) rotating first and second rigid side section floors to be parallel to and proximate the first and second center section side planes, respectively;
ii) turning multiple first and second side section panels to be alongside the first and second side section floors and generally within the first and second center section side planes, respectively, and closing the center section first and second sides; and
iii) locking the first and second side section panels to the center section floor and thereby placing the shelter in the transport mode,

wherein the step of unfolding the first and second side sections comprises the steps of:
a) unlocking the first and second side section panels from the center section floor;
b) turning the first and second side section panels to be substantially outside of the center section first and second side planes, respectively;
c) rotating the first and second side section floors to be generally coplanar with the center section floor; and
d) locking the first and second side section panels to the respective first and second side section floors and thereby converting the shelter into the deployed mode, and

wherein the step of turning the first and second side section panels comprises the steps of:
a. turnably mounting first and second end panels of each side section to the front and back ends of the center section along a vertical axis;
b. turnably mounting first and second middle panels of each side section to a respective first and second end panel along a vertical axis; and
c. turnably mounting a door assembly to the first and second middle panels of each side section along a vertical axis.

2. The method of claim 1 wherein the step of providing a center section comprises the step of providing a door on the center section back end.

3. The method of claim 1 comprising the further steps of:
a. hinging a top door to the center section back end proximate the roof thereof; and
b. hinging a bottom door to the center section back end proximate the floor thereof.

4. The method of claim 3 comprising the further step of fixing rails to the center section floor and to the bottom door.

5. The method of claim 3 comprising the further steps of:
a. providing a bar on the center section front end; and
b. providing a pair of channels under the center section floor and thereby enabling the shelter to be handled by a pallet handling system.

6. The method of claim 3 comprising the further steps of:
a. hinging a pair of outer doors on selected center section corner posts;
b. pivoting the bottom and top doors to be generally parallel to the center section floor, and pivoting the outer doors to be generally parallel to the first and second center section side planes and thereby enabling entrance into the center section through the back end thereof; and
c. pivoting the top, bottom, and outer doors each to lie generally in the center section back end plane and thereby preventing entrance into the center section through the back end thereof.

7. The method of claim 1 wherein the step of unfolding the first and second side sections comprises the steps of:
a. turning the first and second end panels of each side section to be substantially parallel to the center section front and back ends, and turning the first and second middle panels and the door assembly of each side section to be substantially perpendicular to the end panels;
b. rotating the first and second side section floors to be generally coplanar with the center section floor; and
c. locking the end panels, middle panels, and door assembly of each side section to the respective side section floor.

8. The method of claim 7 wherein the step of turnably mounting a door assembly comprises the steps of:
a. turnably mounting a first door frame to the first middle panel; and
b. turnably mounting a second door frame to the second middle panel.

9. The method of claim 8 comprising the further step of attaching the first and second door frames to each other.

10. The method of claim 9 comprising the further steps of:
a. unlocking the end panels, middle panels, and door assemblies of each side section from the associated side section floor;
b. detaching the first and second door frames from each other;
c. rotating the first and second side section floors to lie generally in the center section first and second side planes, respectively;
d. turning the first and second end panels the first and second middle panels, and the door assembly of each side section to lie generally in the center section first and second side planes; and
e. locking the first and second end panels, first and second middle panels, and door assemblies of each side section to the center section floor and thereby converting the shelter back to the transport mode.

11. The method of claim 8 comprising the further step of providing at least one side door in the first door frame.

12. The method of claim 7 wherein the step of locking the end panels, middle panels, and door assembly comprises the steps of:
a. providing each end panel, middle panel, and door assembly with a locking bar; and
b. engaging each locking bar with the associated side section floor.

13. The method of claim 7 comprising the further steps of:
a. unlocking the end panels, middle panels, and door assemblies of each side section from the associated side section floor;
b. rotating the first and second side section floors to lie generally in the center section first and second side planes, respectively;
c. turning the first and second end panels the first and second middle panels, and the door assembly of each side section to lie generally in the center section first and second side planes; and
d. locking the first and second end panels, first and second middle panels, and door assemblies of each side section to the center section floor and thereby converting the shelter back to the transport mode.

14. The method of claim 1 comprising the further step of extending a cover from the center section roof to each of the side section panels when the shelter is in the deployed mode.

15. The method of claim 1 comprising the further step of installing selected tire repair equipment in the center section.

16. The method of claim 1 comprising the further steps of:
a. installing selected tire repair equipment in the center section; and
b. relocating the tire equipment within the center section and side sections when the shelter is in the deployed mode.

17. The method of claim 1 wherein the step of providing a center section comprises the step of providing a center section that is approximately 19 feet 101⁄2 inches long, eight feet wide, and eight feet high.

18. The method of claim 1 wherein the step of unfolding the first and second side sections comprises the step of unfolding the first and second side sections to a width of approximately 19 feet eight inches for the shelter in the deployed mode.

19. The method of claim 1 comprising the further step of sealing joints between the end panels and the middle panels, and between the end panels and the center section.

20. The method of claim 1 wherein the step of rotating the first and second rigid side section floors comprises the steps of:
a. receiving at least one winch in a selected center section corner post;
b. hooking a cable from the at least one winch to a selected one of the first and second side section floors; and
c. operating the winch and cable and assisting rotating the selected side section floor.

21. The method of claim 1 wherein the step of rotating first and second rigid side section floors comprises the step of retaining the first and second rigid side section floors parallel to and proximate the first and second center section side planes, respectively.

22. A method of sheltering persons and equipment comprising the steps of:
a. providing a center section having a front end and an open back end that define respective vertical front and back end planes, and opposed first and second sides that define respective first and second vertical side planes, and having a rigid floor, corner posts, and a rigid roof;
b. folding first and second side sections to lie generally within the center section first and second side planes, respectively, to close the center sections first and second sides and cooperate with the center section floor, roof, and ends to make a shelter that is in a transport mode;
c. unfolding the first and second side sections to be substantially outside of the center section first and second side planes, respectively, and cooperate with the center section to convert the shelter into a deployed mode;
d. hinging a to door to the center section back end proximate the roof thereof;
e. hinging a bottom door to the center section back end proximate the floor thereof; and
f. fixing rails to the center section floor and to the bottom door,

wherein the step of folding the first and second side sections comprises the steps of:
i) rotating first and second rigid side section floors to be parallel to and proximate the first and second center section side planes, respectively;
ii) turning multiple first and second side section panels to be alongside the first and second side section floors and generally within the first and second center section side planes, respectively, and closing the center section first and second sides; and
iii) locking the first and second side section panels to the center section floor and thereby placing the shelter in the transport mode,

the method of comprising the further steps of:
a. pivoting the top and bottom doors to be generally parallel to the center section roof and floor, respectively;
b. rolling a cart along the rails from a first location inside the center section to a second location outside the center section and on the bottom door; and
c. covering and sealing the center section open back end in response to rolling the cart to the second location thereof.