SHELTER AND SHELTER CONSTRUCTION METHOD

Abstract: The shelter (20) comprises a unitary first shell (22) and a unitary second shell (24). The first shell is formed by making at least two transverse bends (42, 44) in a single generally rectangular panel and provides a unitary top wall (30), bottom wall (32), and first end wall (34). The second shell is formed by making at least two transverse bends (46, 48) in a single, generally rectangular panel and provides a unitary second end wall (36), first side wall (38), and second side wall (40). The first and second shells are complementarily positioned to create the shelter (20). A first metallic member (62) is bonded along the peripheral edge of the first shell and a second metallic member (64) is bonded along the peripheral edge of the second shell means. The first and second metallic members adjoiningly facilitate welding the complementarily positioned first and second shells together. A sealable entryway (28) is provided in at least one of the walls. Wheel wells (92, 94) may be provided for allowing the shelter to be transportably attached to a transport vehicle. The shelter construction will attenuate the passage of electromagnetic waves into the shelter.

Description: BACKGROUND OF THE INVENTION The present invention generally relates to shelters and shelter construction methods and more particularly is concerned with a shelter in which the entire body of the shelter may be formed from two complementarily positioned shells and which will shieldingly attenuate the passage of electromagnetic waves into the shelter. SUMMARY OF THE INVENTION It is an object of the present invention to provide a shelter and shelter construction method in which the entire body of the shelter can be quickly and easily formed from two shell means thereby reducing labor and material costs, which reduce the number of joints and therefore provide increased electromagnetic wave shielding and attenuation, and which incorporate aluminum extrusion around the peripheral edges of the shell means so that the joints may be welded together to provide electromagnetive wave attenuation without the heat of the welding procedure delaminating the bonding within the shell means. Accordingly the present invention provides a shelter and method of constructing the shelter comprised of a unitary first shell means, a unitary second shell means, sealing means, and entryway means. The unitary first shell means forms a unitary top wall, bottom wall, and first end wall. The unitary second shell means forms a unitary second end wall, first side wall, and second side wall. The first shell means and second shell means are complementarily positioned to create the shelter. The sealing means sealingly engages the first and second shell means and may comprise a first metallic member bonded along the peripheral edge of the first shell means and a second metallic member bonded along the peripheral edge of the second shell means. The first and second metallic members facilitate the welding connection of the first shell means to the second shell means without delaminating the bonding in, or deforming, the first or second shell means and shieldingly attenuate the passage of electromagnetic waves into the shelter. The entryway means is located in at least one of the wall for sealably allowing entry into and exit from the shelter and may include means for shieldingly attenuating the passage of electromagnetic waves into the shelter, The shelter and method may also include wheel well means for allowing the shelter to be transportably attached to a transport vehicle. In accordance with this invention the following 19 embodiments are particularly preferred: 1. A shelter, comprising: a unitary first shell means for forming a unitary top wall, bottom wall, and first end wall; a unitary second shell means for forming a unitary second end wall, first side wall, and second side wall, the first and second shell means being complementarily positioned to create the shelter; sealing means for sealingly engaging the first and second shell means; and entryway means, located in at least one of the walls, for sealably allowing entry into and exit from the shelter. 2. The shelter of embod. 1: wherein the first shell means is formed from a single, formable generally rectangular and planar panel, the panel having at least two bends; and wherein the second shell means is formed from a single, formable, generally rectangular and planar panel, the panel having at least two bends. 3. The shelter of embod. 1 in which the sealing means comprises: means for shieldingly attenuating the passage of electromagnetic waves into the shelter. 4. The shelter of embod. 1 in which the entryway means comprises: means for shieldingly attenuating the passage of electromagnetic waves into the shelter. 5. The shelter of embod. 1 in which the first and second shell means each comprise: at least two planar face p lates; and a core of filler material, the core being bonded between the face plates. 6. The shelter of embod. 1 in which the first and second shell means each comprise: at least two metallic planar face plates; and a non-metallic honeycomb core, the core being adhesively bonded between the face plates. 7. The shelter of embod. 6 in which the sealing means comprises: welding means for facilitating the welding connection of the first shell means to the second shell means and for displacing the heat associated with making the weld away from the first and second shell means thereby allowing the weld to be made without deforming the first shell means, the second shell means, or the welding means; without delaminating the bonding within the first and second shell means; and without delaminating the bonding between the welding means and the first and second shell means. 8. The shelter of embod. 7 in which the welding means comprises: a first metallic member, in transverse cross-section the first metallic member having a bottom end bonded along the peripheral edge of the first shell means and having a top end; a second metallic member, in transverse cross-section the second metallic member having a bottom end bonded along the peripheral edge of the second shell means and having a top end; and wherein the top end of the first metallic member weld receivingly adjoins the top end of the second metallic member when the first and second shell means are complementarily positioned to form the shelter. 9. The shelter of embod.8: wherein the first and second metallic members are extruded hollow metallic members; and wherein the bottom end of each of the first and second metallic members is generally rectangularly shaped; and wherein the top end of each of the first and second metallic members is generally triangularly shaped, one triangular side generally facing the inside and the other triangular side generally facing the outside of the shelter, the apex of the triangular top end of the first and second metallic members being slightly flattened; and wherein the inside facing triangular side of the first metallic member complementarily adjoins the inside facing triangular side of the second metallic member with the outside facing triangular sides of the first and second metallic members forming a surface generally perpendicular to the adjoining inside facing triangular sides and the flattened apexes of the top ends adjoining to form a weld receiving crevice when the first and second shell means are positioned to form a shelter. 10. The shelter of embod. 9 comprising: cap means, attached to the outside surface of the adjoined first and second metallic members, for covering the first and second metallic members. 11. The shelter of embod.10: wherein the outside surface of the bottom end of each of the first and second metallic members has a recess for receiving the cap means. 12. The shelter of embod. 1, further comprising; wheel well means, located near the first and second side walls of the shelter, for allowing the shelter to be transportably attached to a transport vehicle. 13. The wheel well means of embod. 12, further comprising: means for shieldingly attenuating the passage of electromagnetic waves into the shelter. 14. A method of constructing a shelter, comprising the steps of: making at least two bends in a unitary and formable first shell means in order to form a unitary top wall, bottom wall, and first end wall; making at least two bends in a unitary and formable second shell means in order to form a unitary second end wall, first side wall, and second side wall; complementarily positioning the first and second shell means; sealingly engaging the first ans second shell means; and sealably allowing entry into and exit from the shelter through at leas t one of the walls. 15. The method of embod.14, further comprising the step of: shieldingly attenuating the passage of electromagnetic waves into the shelter. 16. The method of embod. 14 in which the first and second shell means each comprise: at least two planar face plates; and a core of filler material, the core being bonded between the face plates. 17. The method of embod. 14 in which the first and second shell means each comprise: at least two metallic planar face plates; and a non-metallic honeycomb core, the core being adhesively bonded between the face plates. 18. The method of embod. 17, further comprising the steps of: bonding a welding means to the peripheral edge of each of the first and second shell means; and welding the welding means of the first shell means to the welding means of the second shell means without deforming the first shell means, the second shell means, or the welding means; without delaminating the bonding between the welding means and the first and second shell means; and without delaminating the adhesive bonding within the first and second shell means. 19. The method of embod. 14, further comprising the step of: receiving the wheels of a transport vehicle with the shelter in order to transportably attach the shelter to a transport vehicle. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood by reference to the examples of the following drawings: FIGURE 1 is a perspective view of an embodiment of the present invention; FIGURE 2 is an exploded, perspective view of an embodiment of the present invention illustrating the assembly of the invention. FIGURE 3 is a fragementary view of FIGURE 1 illustrating the connection of a wall of the first shell means to a wall of the second shell means. FIGURE 4 is a fragmentary, partially exploded view of FIGURE 1 illustrating the connection of a wall of the first shell means to a wall of the second shell means. DETAILED DESRIPTION OF THE PREFERRED EMBODIMENTS Before explaining the present invention in detail, it is to be understood that the invention is not limited to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of other embodiments and of being practiced or carried out in various way commensurate with the claims herein. Also it is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. FIGURE 1 present one embodiment of the shelter, generally desginated 20, of the present invention. The shelter 20 is basically comprised of a unitary first shell means 22, a unitary second shell means 24, sealing means 26, and entryway means 28, best seen in FIGURE 2. To give an overview of these basic elements, their function and interaction, referring to the example of FIGURE 2, the unitary first shell means 22 is used for forming a unitary top wall 30, bottom wall 32, and first end wall 34. The unitary second shell means 24 is used for forming a unitary second end wall 36, first side wall 38, and second side wall 40. The first and second shell means 22, 24 are complementarily positioned to create the shelter 20, as seen in FIGURE 2. The sealing means 26 is used for sealingly engaging the first and second shell means 22, 24, and may also comprise means for shieldingly attenuating the passage of electromagentic waves into the shelter 20. The entryway means 28 is located in at least one of the walls, 30, 32, 34, 36, 38, 40 and is used for sealably allowing entry into and exit from the shelter 20. The entryway means 28 may also include means for shieldingly attenuating the passage of electromagnetic waves into the shelter 20. As exemplified in FIGURE 2 , the first shell means 22 may be formed from a single, formable, generally rectangular, and planar panel, also designated 22. The panel 22 should have at least two bends 42, 44. The bends 42, 44 should give the panel 22 the shape necessary to provide the top, bottom, and first end walls 30, 32, 34 of the first shell means. Similarly, the second shell means 24 may be formed from a single, formable, generally retangular, and planar panel 24. The panel 24 should have at least two bends 46, 48. The bends 46, 48 should give the panel 24 the shape necessary to provide the second end, first side, and second side walls 36, 38, 40 of the second shell means 24. The bends 42, 44, 46, 48 in the prototype are made transversely in the panels 22, 24, although other bending arrangements are possible, such as making longitudinal bends in one panel and transverse bends in the other. As exemplified in FIGURE 3 and 4, the first and second shell means or panels 22, 24 may each individually comprise a core 50 of filler material and at least two planar face plates 52, 54, with the core being bonded between the face plates 52, 54. Preferably the first and second shell means or panels 22, 24 will each individually comprise at least two metallic planar face plates also designated 52, 54 and a non-metallic honeycomb core 50 with the core 50 being adhesively bonded between the face plates 52, 54. Referring to FIGURE 3 and 4, in the example embodiment, the sealing means 26 comprises welding means, also designated 26, attached along the peripheral edge of each of the first and second means 22, 24, i.e., there should be a welding means 26 attached along the peripheral edge 56 of the first shell means 22 and a welding means 26 bonded along the peripheral edge 58 of the second shell means 24. The welding means 26 is used for facilitating the welding connection of the first shell means 22 to the second shell means 24 and for displacing the heat associated with making the weld away from the first and second shell means 22, 24. This allows the weld 60 to be made without deforming the first shell means 22, the second shell means 24, or the welding means 26; without delaminating the bonding within the first and second shell means 22, 24; and without delaminating the bonding between the welding means 26 and the first and second shell means 22, 24. The present invention also includes the method of constructing the shelter 20 described supra. Referring to FIGURE 2, the method basically comprises the steps of: ...making at least two bends 42, 44 in a unitary and formable first shell means 22 in order to form a unitary top wall 30, bottom wall 32, and first end wall 34; ...making at least two bends 46, 48 in a unitary and formable second shell means 24 in order to form a unitary second end wall 36, first side wall 38, and second side wall 40; ...complementarily positioning the first and second shell means 22, 24 to create the shelter 20; ...sealingly engaging the first and second shell means 22, 24; and ...sealably allowing entry into and exit from the shelter 20 through at least on the the walls 30, 32, 34, 36, 38, 40. Referring to FIGURES 3 and 4, in the method, as with the shelter 20, the first and second shell means 22, 24 may each comprise at least two planar face plates 52, 54 and a core 50 of filler material, the core being bonded between the face plates 52, 54. Preferably, the first and second shell means 22, 24 should each comprise at least two metallic planar face plates 52, 54 and a non-metallic honeycomb core 50, the core being adhesively bonded between the face plates. The sealing step of the method, described supra, may further comprise the steps of: ...bonding a welding means 26 to the peripheral edge 56, 58 of each of the first and second shell means 22, 24; and ...welding the welding means 26 of the first shell means 22 to the welding means 26 of the second shell means 24 without deforming the first shell means 22, the sec ond shell means 24, or the welding means 26; without delaminating the bonding between the welding means 26 and the first and second shell means 22, 24; and without delaminating the adhesive bonding within the first and second shell means 22, 24. The method may further comprise the step of shieldingly attenuating the passage of electromagnetic waves into the shelter 20. This shielding step is normally effected by the type of sealing implemented in the steps of sealing engaging the first and second shell means 22, 24 and in the sealable entry step. The details of implementing these steps are discussed, infra, as is the construction of the first and second shell means 22, 24 which is necessary to complete the shielding. In both the shelter 20 and method of constructing the shelter, as exemplified in FIGURE 3 and 4, the welding means 26 may comprise a first metallic member 62 and a second metallic member 64. In cross section the first member 62 has a bottom end 66 bonded along the peripheral edge 56 of the first shell means 22 and has a top end 68. The second member 64 has a bottom end 70 bonded along the peripheral edge 58 of the second shell means 24 and has a top end 72. The top end 68 of the first member 62 should weld receivingly adjoin the top end 72 of the second member 64 when the first and second shell means 22, 24 ar complementarily positioned to form the shelter 20. Referring to FIGURE 3 and 4, in the prototype shelter 20 and method the first and second members 62, 64 are extruded, hollow, metallic members, preferably made from aluminum, aluminum alloy, or equivalent. The transversely cross-sectional bottom end 66 of the first member 62 is generally retangular shaped and is adhesively bonded along the peripheral edge 56 of the first shell means 22. The transversely cross-sectional bottom end 70 of the second member 64 is generally rectangularly shaped and is adhesively bonded along the peripheral edge 58 of the second shell means 24. The transversely cross-sectional top end 68 of the first member 62 is generally triangularly shaped and has a triangular side 74 generally facing the inside of the shelter 20 and a triangular side 76 generally facing the outside of the shelter 20. The apex 78 of the triangular top end 68 is slightly flattened to receive the weld 60. The transversely cross-sectional top end 72 of the second member 64 is generally triangularly shaped and has a triangular side 80 generally facing the inside of the shelter and a triangular side 82 generally facing the outside of the shelter 20. The apex 84 of the triangular top end 72 is slightly flattened to receive the weld 60. When the first and second shell means 22, 24 are complementarily positioned to form the shelter 20, the inside facing triangular side 74 of the first member 62 should complementarily adjoin the inside facing triangular side 80 of the second member 64, i.e., the adjoined inside facing triangular sides 74, 80 should allow the walls of the first and second shell means 22, 24 to which the adjoined inside facing triangular side 74, 80 are bonded to be disposed in perpendicular relationship. In other words, the adjoined inside triangular sides 74, 80 should facilitate an angular relationship of ninety degrees between adjoining walls. The outside facing triangular sides 76, 82 of the first and second members 62, 64 should form a surface generally perpendicular to the plane of the adjoining inside facing triangular sides 74, 80 and the flattened apexes 78, 84 of the top ends 68, 72 should adjoin to form a weld receiving crevice, as exemplified in FIGURES 3 and 4. It is recognized that the first and second metallic members 62, 64 may be of any shape which will allow the first and second shell means 22, 24 to be welded together and that the adjacent walls of the shelter may have angular relationships other than ninety degrees. Also the first and second shell 22, 24 means may be fastened together by other methods than welding, with or without utilizing the welding means 26, such as adhesive bonding, mechanical fastening, etc., although welding is the most efficient method known to the inventor which also shieldingly attenuates the passage of electromagnetic waves through the fastening method into the shelter 20. The prototype shelter 20 and method, referring to FIGURE 3 and 4, also comprises cap means 86, attached to the outside surface of the adjoined first and second metallic members 62, 64 for covering the first and second metallic members 62, 64. As illustrated, the cap means 86 may conform to the shape of the outside surface of the adjoined first and second metallic members 62, 64. The cap means 86 of the prototype are mechanically fastened with rivets to the first and second metallic members 62, 64 although other forms of fastening, such as adhesive bonding, welding, bolts, screws, etc. may be used. In the prototype the cap means 86 are extruded from the same material as the first and second metallic members 62, 64. The cap means 86 also add structural integrity to the shelter 20. Also, in the prototype, the outside surface of the bottom end 66, 70 of each of the first and second metallic members 62, 64 has a recess 88, 90 for receiving the cap means 86. The recesses 88, 90 should be of sufficient depth to maintain the outside surface of the cap means 86 generally flush with the outside face plates 52 of the first and second shell means 22, 24. The prototype shelter 20 and method, illustrated in FIGURE 2, comprises wheel well means 92, 94, located near the opposite first and second side walls 38, 40 of the shelter 20, for receiving the wheels of a transport vehicle and for allowing the shelter 20 to be transportably attached to a transport vehicle. The wheel well means 92, 94 may comprise means for shieldingly attenuating the passage of electromagnetic waves into the shelter 20. As exemplified in FIGURE 1, the prototype of the shelter and method 20 was designed to meet the current requirements of military MIL-S-5541 specification for shelter model no. S-250 and was designed for use on a truck, such as a pickup. More specifically, the prototype shelter 20 was designed to be mounted on the U.S. Army's latest 1¹/₄ ton, four wheel drive vehicle. The entryway means 28 of the military prototype is located in the second end wall 36 of the second shell means 24, as the second end wall 24 allows the easiest access from outside a typical pickup. The entryway means 28 may be located in any wall 30, 32, 34, 36, 38, 40 of the shelter 20 to satisfy a particular need or desire. The entryway means 28 of the military prototype includes a door 28 which is inset into the second end wall 36 when the door is closed. The door jamb 96 extends around all four sides of the doorway to provide a good seal and to attenuate the passage of electromagnetic waves into the shelter 20. In the military prototype of the shelter 20 and method, the planar face plates 52, 54 are made of .040 inch thick aluminum sheets and the core 50 is a non-metallic phenolic coated paper honeycomb, best seen in FIGURES 3 and 4. The face plates 52, 54 of the prototype extend beyond the core 50 along the peripheral edges 56, 58 of the first and second shell means 22, 24 to create a channel in which the bottom ends 66, 70 of the first and second metallic members 62, 64 are adhesively and integrally bonded, as best seen in FIGURES 3 and 4. Thus, in the prototype, the first and second metallic members are an integral part of the first and second shell means 22, 24. Thermal barriers 98, 99, 100, 101 are provided in the channel to provide a thermal break and also are utilized as electrical continuity barriers in order to provide two separate electrical ground planes utilizing face plates 52 and 54. In the prototype the thermal barriers 98, 99, 100, 101 are made of plastic laminate. In the military prototype of the shelter 20 and method, there are two transverse bends in each of the first and second shell means 22, 24. The transverse bends 42, 44, 46, 48 are made by crimping the planar panels 22, 24 on the side which is to be the inside of the shelter 20. The sealing means 26 or first ans second metallic members 62, 64 extend completely around the peripheral edges 56, 58 except at the transverse bends 42, 44, 46, and 48 because of the size reductions and structural distortions creayed by the crimping and bending. The phenolic coated paper honeycomb core 50 is fiber reinforced in the area of the transverse bends 42, 44, 46, 48 in the prototype. The fiber reinforcement gives the honeycomb core 50 the resilience necessary to prevent shattering of the core in the transverse bends 42, 44, 46, 48. The corners of the shelter created by the transverse bends 42, 44, 46, 48 are sealed with upper corner caps 102 and lower corner caps 104. Although not all of the corner caps 102, 104 are visible in the drawings, there are a total of eight corner caps on the prototype shelter 20, one corner cap on each corner. The upper corner caps 102 may include lifting eyes, as exemplified in FIGURE 1, to allow mechanically lifting the shelter 20 on and off a truck and a means of securing the shelter to the vehicle. The corner caps 102, 104 protect and strengthen the corners of the shelter 20 and provide shielding at the corners to attenuate the passage of electromagnetic waves into the shelter 20. The corner caps 102, 104 may be mechanically fastened with rivets, bolts, screws, etc. to the shelter 20; and in the prototype they are riveted to the shelter. The prototype corner caps 102, 104 are made of aluminum alloys. As previously stated, the planar panels 22, 24 from which the prototype first and second shelter means 22, 24 are made are of aluminum sheet and phenolic coated paper honeycomb construction, which provides electromagnetic wave shielding. The welding means 26 or first and second metallic members 62, 64 of the prototype shelter 20, are designed to allow the first and second shelter means 22, 24 to be welded together in order to provide good electromagnetic wave attenuation along the adjoining edges of the first and second shelter means 22, 24. In the military prototype the peripheral edges 106, 108 of the wheel well means 92, 94 are of similar construction to the peripheral edges 56, 58 of the first and second shell means 22, 24 discussed supra. Metallic members (not illustrated) substantially identical to the first and second members 62, 64 are integrally bonded to the contacting peripheral edges 106 of wheel well means 92, 94 and the first shell means 22. This engagement between the wheel well means 92, 94 and the first shell means 22 is then welded and covered with cap means 110, substantially identically to the engagement of the first and second shell means 22, 24. For expediency in manufacture and assembly of the shelter 20, metallic members (not illustrated) which are rectangular in transverse cross-section are integrally bonded to the contacting peripheral edges 108 of the wheel well means 92, 94 and the second shell means 24. These rectangular metallic members fit together to form a ninety-degree corner and are covered with an extruded cap means 111 which is extruded in a shape to fit the ninety-degree corner. The rectangular metallic members are not welded together, but the ninety-degree cap means 111 is mechanically fastened to the rectangular metallic members and this mechanical fastening engages the wheel well means 92, 94 to the second shell means 24 in the prototype. The cap means 110, 111 are mechanically fastened to the metallic members with rivets, although bolts, screws and other types of fastening will work. While the invention has been described with a certain degree of particularity it is manifest that many changes may be made in the details of construction and the arrangement of components without departing from the spirit and scope of this disclosure. It is understood that the invention is not limited to the embod iment set forth herein for purposes of exemplification, but is to be limited only by the scope of the attached claim or claims including the full range of equivalency to which each element thereof is entitled.

Claims: 1. A shelter, comprising:a unitary first shell means for forming a unitary top wall, bottom wall, and first end wall;a unitary second shell means for forming a unitary second end wall, first side wall, and second side wall, the first and second shell means being complementarily positioned to create the shelter;sealing means for sealingly engaging the first and second shell means; andentryway means, located in at least one of the walls, for sealably allowing entry into and exit from the shelter. 2. The shelter of Claim 1:wherein the first shell means is formed from a single, formable, generally rectangular and planar panel, the panel having at least two bends; andwherein the second shell means is formed from a single, formable, generally rectangular and planar panel, the panel having at least two bends. 3. The shelter of Claim 1 in which the sealing means and for the entryway means comprises:means for shieldingly attenuating the passageway of electromagnetic waves into the shelter. 4. The shelter of Claim 1 in which the first and second shell means each comprise:at least two planar face plates; anda core of filler material, the core being bonded between the face plates;in particular wherein the first and second shell means each comprise:at least two metallic planar face plates; anda non-metallic honeycomb core, the core being adhesively bonded between the face plates. 5. The shelter of one of the preceding claims in which the sealing means comprises:welding means for facilitating the welding connection of the first shell means to the second shell means and for displacing the heat associated with making the weld away from the first and second shell means thereby allowing the weld to be made without deforming the first shell means, the second shell means, or the welding means; without delaminating the bonding within the first and second shell means; and without delaminating the bonding between the welding means and the first and second shell means;in particular wherein the welding means comprises:a first metallic member, in transverse cross-section the first metallic member having a bottom end bonded along the peripheral edge of the first shell means and having a top end;a second metallic member, in transverse cross-section the second metallic member having a bottom end bonded along the peripheral edge of the second shell means and having a top end; andwherein the top end of the first metallic member weld receivingly adjoins the top end of the second metallic member when the first and second shell means are complementarily positioned to form the shelter;more particularlywherein the first and second metallic members are extruded hollow metallic member; andwherein the bottom end of each of the first and second metallic members is generally rectanuglarly shaped; andwherein the top end of each of the first and second metallic members is generally triangularly shaped, one triangular side generally facing the inside and the other triangular side generally facing the outside of the shelter, the apex of the triangular top end of the first and second metallic members being slightly flattened; andwherein the inside facing triangular side of the first metallic member complementarily adjoins the inside facing triangular side of the second metallic member with the outside facing triangular sides of the first and second metallic members forming a surface generally perpendicular to the adjoining inside facing triangular sides and the flattened apexes of the top ends adjoining to form a weld receiving crevice when the first and second shell me ans are positioned to form a shelter. 6. The shelter of Claim 5 comprising:cap means, attached to the outside surface of the adjoined first and second metallic members, for covering the first and second metallic members;in particular wherein the outside surface of the bottom end of each of the first and second metallic members has a recess for receiving the cap means. 7. The shelter of Claim 1, further comprising:wheel means, located near the first and second side wall of the shelter, for allowing the shelter to be transportably attached to a transport vehicle;more particularly wherein the wheel well means comprise: means for shieldingly attenuating the passage of electromagentic waves into the shelter. 8. A method of constructing a shelter, comprising the steps of:making at least two bends in a unitary and formable first shell means in order to form a unitary top wall, bottom wall,and first end wall;making at least two bends in a unitary and formable second shell means in order to form a unitary second end wall, first side wall, and second side wall;complementarily positioning the first and second shell means;sealingly engaging the first and second shell means; andproviding an entryway for sealably allowing entry into and exit from the shelter through at least one of the walls. 9. The method of Claim 8 wherein the shelter as defined in one of the preceding claims 1 to 7 is built.

Inventors: DOWNEY, DONALD R., WITTEN, DONALD W.
Applicants: NORDAM
Application year: 1987
Main classification: E04B1
IPC codes: E04H9, E04B1