INFLATABLE SELF-ERECTING TENT

Abstract: One or more inflatable tubes are used to support a self-erecting tent. If two or more tubes then they may have at least one cross over criss-crossed in the manner of conventional domed tent poles. The tube or tubes are secured or releasably secured to the tent so that the tent is self-erecting as the tube or tubes are inflated. When two or more tubes are employed, the tubes may be connected by an auxiliary tube so that forcing pressurized air into one tube results in all tubes inflating simultaneously. The ends of the tubes are self-sealing so as to accommodate relatively high air pressure within the tube, in the order of 20-30 pounds per square inch inflated pressure, thereby providing a significantly rigid structure from which the tent is suspended.

Description: INFLATABLE SELF-ERECTING TENT Field of the Invention This invention relates to inflatable tent supports for erecting and supporting light weight shelters such as awnings and tents or other lightweight portable structures. Background of the Invention Tents commonly utilize a semi-rigid, segmented pole. Segmented fibreglass or aluminium poles are commonly used to support, for example, dome tents. The inflatable tent supports of the present invention overcome several difficulties associated with commonly utilized tent supporting structures. For example, they require no assembly prior to use. They are not normally subject to loss by being misplaced. They are easily used by those persons unfamiliar with the erecting of tents or those persons lacking sufficient strength or manual dexterity for such an undertaking and may be rapidly and easily used during inclement weather or at night. As opposed to most other prior art involving inflatable tents, there are no manifolds at the apex, or apexes. Instead inflatable tubes criss-cross one another to provide for uplifting self-erecting of the tent, and, once erected, to provide structural integrity to the tent. In particular, in the prior art applicant is aware of United States Patent Number 5,205,086 which issued to Heim on April 27, 1993 for an inflatable tent. Heim teaches a tent having a flexible canopy, floor and a series of inflatable tubes serving as frame hoops which, according to the teaching of Heim do not criss-cross in the manner of conventional domed tent supports. The tubes of Heim are fastened removably to the tent using sleeves that open along a longitudinal slit. Hook and loop releasable fasteners are employed for closing the sleeves onto the tubes. The tubes of Heim are taught to be made of thermal plastics or vinyl and are the same diameter as the corresponding sleeves. Rigid boot cups are provided at the ends of the tubes for supporting the tube ends therein. Each of the tubes are independently inflated. Thus, the tent of Heim is not self-erecting as the tubes are inflated as is the case in the present invention. Summary of the Invention In the inflatable tent of the present invention, one or more inflatable tubes are used to support a self-erecting tent. If two or more tubes are used, they may have at least one cross over criss-crossed at each juncture in the manner of conventional domed tent poles. The tube or tubes are secured or releasably secured to the tent so that the tent is self-erecting as the tube or tubes are inflated. When two or more tubes are employed, the tubes are pneumatically connected by an auxiliary tube so that forcing pressurized air into one tube results in all tubes inflating simultaneously. The ends of the tubes are self-sealing so as to accommodate relatively high air pressure within the tube, in the order of 20-30 pounds per square inch inflated pressure, thereby providing a significantly rigid structure from which the tent is suspended. Advantageously, the auxiliary tube extends between the two criss-crossing tubes in airflow communication therebetween at approximately the apex of the dome shape defined by the tubes. The ends of the tubes and along the length of the tubes are attached or mounted to the tent, advantageously along corresponding seams between tent panels. The tubes may, in one embodiment, be releasably mounted onto the tent by means of releasable fasteners such as zippers. The end result is that, once the tent of the present invention has been erected, it does not need to be held up by auxiliary structures such as guy wires as is the case in the Heim teaching. The tubes comprise outer non-resilient sleeves containing inner resilient bladders, for example, rubber inner-tubes. This is not intended to be limiting as it may be reasonably foreseen to use a tubeless sleeve, where the sleeve itself is air-tight and an inner bladder is not required. The ends of the inner rubber bladder coincide with the ends of the non-resilient sleeves and are self-sealing by means of the ends of the inner-tubes being folded over onto themselves within the sleeve so that inflation of the inner-tube sandwiches the folded over end between the inflated inner-tube and the inner non-resilient surface of the sleeve. Folding over the end of inner bladder, combined with the use of conventional adhesives to seal the open ends of the bladder provides for an airtight seal even at high inflated pressure. The ends of the tubes therefore have no rigid parts which may become crushed or distorted in use as in the case of the Heim device. The rubber bladder is sewn into the sleeve so as to trap the folded over portion of the bladder within the ends of the sleeve. Increasing the air pressure within the inner-tube merely forms a stronger airtight seal at the ends of the bladder by increasing the compressive force applied to the folded over end sandwiched between the inflated bladder and the sleeve. In the embodiment of the present invention in which the tubes are releasably mounted to the tent by means of releasable fasteners such as zippers, the tubes may be unzipped from the tent in the case of puncture of the bladder within a tube. The tubes may be unfastened at their ends from the bottom corners of the tent, for example by undoing snaps or other releasable fasteners holding the ends of the tubes securely fastened to the bottom corners of the tent. A punctured tube may thus be replaced with an identical spare tube. This may be quickly accomplished. Since all tubes used to support the tent are identical, only one spare tube need be carried. The criss-cross between the tubes at the apex of the tent support structure does not result in interference between the two tubes. This is because adjustments are made to the circumferential profile of the corresponding tent seams over which the tubes pass. Whether or not the tubes pass over seams between tent panels, the circumferential portions of the tent over which the tubes pass are adjusted, by adjusting the circumferential length of segments of the corresponding circumferential profiles, so that one tube crosses over the apex at higher elevation than the other tube. Thus, in one preferred embodiment, first and second criss-crossing inflatable tubes are mounted or mountable to corresponding criss-crossing first and second circumferential profiles wherein the first and second circumferential profiles may correspond to the seams between tent panels making up the tent. In any event, the first and second circumferential profiles are differently shaped when view in cross-section in first and second corresponding planes containing correspondingly the first and second circumferential profiles, the first circumferential profile having a shorter circumferential distance than the second circumferential profile. Thus, when the first and second tubes are mounted along their corresponding first and second circumferential profiles along segments of those profiles not including segments at the apex of the tent, and in view of the fact that both the first and second tubes are identical in length, the first tube forms an arch at the apex of the tent which extends a higher vertical distance above the tent apex than does the corresponding portion of the second tube. The first tube therefore crosses over the second tube at the apex of the tent by reason of its higher arched profile. In summary, the inflatable self-erecting tent of the present invention includes, when erect, substantially vertical circumferential first and second profiles intersecting, at corresponding first and second vertices thereof, a common vertical axis. The first and second profiles are radially spaced apart about the common vertical axis. A first inflatable tube is mounted or mountable to the first profile. A second inflatable tube is mounted or mountable to the second profile. The first and second profiles extend circumferentially over the fabric panels of the tent from opposite ground engaging edges of the tent. The first and second profiles have corresponding circumferential first and second distances. The first and second distances are substantially the same. The first and second inflatable tubes are of substantially the same length when mounted to the first and second profiles. The corresponding first and second tubes do not intersect each other. The first vertex, that is, the vertex of the first profile is above the second vertex, that is, the vertex of the second profile. Advantageously, the first and second inflatable tubes are, when mounted to the tent's panels along the first and second profiles, pneumatically interconnected by a flexible air conduit extending between the tubes. In one aspect of the present invention, the first and second inflatable tubes are resilient tubes, and the first and second profiles include corresponding non-resilient sleeves. The sleeves extend circumferentially along the profiles for sliding mounting of the inflatable tubes in journalled relation through the sleeves. In a second aspect, the first and second tubes are self-sealing by self-sealing ends of the tubes. The ends are folded over onto themselves and mounted within the non- resilient sleeves. The ends of the sleeves may form corresponding flap hinges when the ends of the sleeves are mounted to the tent panels. In a further aspect, the first profile is an arch and the second profile approximates a semi-circle. The first and second profiles may be mountable to the seams between panels of the tent or circumferentially over any arc of the tent canopy. The inflatable tent of the present invention may also be described as an inflatable, pegged, self-erecting tent which includes an inflatable tube mounted to a canopy of the tent along a ridge-line thereof. The canopy has circumferential ground-engaging edges adapted for pegged anchoring of the edges to a ground surface. The ridge-line extends over the canopy from one of the edges to an opposite edge. Each end of the tube may have a flexible flap hinge mounted thereto oriented so that a lower flap of the flap hinge is mounted to the canopy, disposed below and adjacent each end of the tube. The flap hinge is directed inwardly towards a center of the tent. Inflation of the tube urges rotation of each end of the tube upwardly about the flap hinge relative to the lower flap. Brief Description of the Drawings Figure 1 is, in perspective view, one embodiment of the inflatable tent of the present invention. Figure la is, in perspective view, a single tube embodiment of the present invention. Figure lb is, in elevation view, the embodiment of Figure 1 showing arched tube profiles overlaid. Figure 2 is a partially cut-away enlarged view of a portion of Figure 1. Figure 3 is a cross-sectional view along line 3-3 in Figure 1, additionally showing a ply-sheet mounted over the tube structure. Figure 4 is a partially cut-away cross-sectional view along an end of a resilient tube bladder according to the present invention. Figure 5 is, in partially cut-away cross-sectional view, an end of the non- resilient tube sleeve of the present invention. Figure 6 is, in partially cut-away cross-sectional view, an enlarged portion of the view of Figure 1. Figure 6a is the view of Figure 6 showing the upward pivoting of the tube as the tube is inflated. Figure 7 is a partially cut-away cross-sectional view along line 7-7 in Figure 6. Figure 8 is, in side elevation view, an alternative use of an inflatable tube according to the present invention for suspending a tent fly above a tent. Figure 9 is a cross-sectional view along line 9-9 in Figure 8. Figure 10 is, in perspective view, an alternative embodiment wherein a vestibule tube supports a tent vestibule. Detailed Description of the Preferred Embodiment Figure 1 is a perspective view of a typical dome-style tent incorporating the present invention, with the tent's fly removed for clarity. Figure la is a perspective view of an inflatable self-erecting tent according to the present invention wherein only one inflatable tube is used, the result being a modified "pup" tent. The pup tent is self-erecting, once the ground edges or comers are pegged to the ground, by inflating the single tube which extends from opposite edges. Inflatable tent supports are illustrated in use with both dome-type tent 10 and the pup tent. In Figure 1 the inflatable tent supports comprise identical elongate inflatable tubes 12 and 14. One such tube is used in the pup tent embodiment of Figure la. The tubes are sealed at their ends and each is enclosed within a non-resilient fabric sleeve 16 as better seen in Figures 2 and 3. Each sleeve 16 is also closed at its terminal ends as better seen in Figures 4 and 6. Sleeve 16 may in one embodiment be formed as an integral part of the tent fabric during manufacture of the tent. However, when retrofitting to existing tent structures, a projecting flexible flange or seam 18 is left on one side of the sleeve so that it may be sewn or releasably mounted, for example by zippers 19, to a corresponding flexible flange or seam 20 on the side of the tent. In the illustrated example of Figure 1, the inflatable tubes cross at the apex 22 of the tent. A pneumatic airway connection is provided between both tubes by a flexible connecting tube 24. Tube 24 may be of smaller diameter than tubes 12 and 14. Stem 28 is advantageously located near a comer of tent 10 or near the access door 26, or any other easily accessible location. Stem 28 contains a one-way valve 30 and projects from each inflatable tube through the fabric of sleeve 16 for inflation of the tubes. When two or more tubes are used, the inner core of a second valve stem, for example valve stem 28a, is removed so that by removing the valve stem cap, air is allowed to escape through valve stem 28a thereby releasing the air pressure and deflating the tubes when taking down the tent. Tubes 12 and 14 are advantageously identical so that only a single replacement or spare tube need be carried. Tubes 12 and 14, once mounted onto the tent, may be inflated through the one-way valve 30. The tubes are inflated by way of a hand pump, or compressed air (for example from a portable tank), or compressor or CO cartridges or the like. The tent is self-erecting, that is, may be erected without additional effort other than inflation of the tubes. As the air pressure in the tubes is increased, the tubes attempt to straighten out. They are constrained by the shape of their corresponding profiles as better seen in Figure lb, the profiles themselves defined by the corresponding tensioned shape of the tent or tent panels along seam 20. The profiles, namely profiles 32 and 34, correspond respectively to tubes 12 and 14. In Figure lb, cross sections along each tube in Figure 1 are overlaid for ease of comparison. Thus it may be seen that profile 34, which corresponds to tube 14, may for example approximate a semi-circle having constant radius Rl . In this case, in order to cross tube 12 over tube 14 at apex 22, keeping in mind that tubes 12 and 14 are identical in length, shape and construction, profile 32 is not of constant radius but rather has side profile distances Dl (measured from common centroid 36) which are less than radius Rl so that tube 12 is forced upwardly into an arch having a vertical distance D2 above centroid 36 at apex 22. With tubes 12 and 14 secured to seams 20, and seams 20 tailored, whether by adapting a conventional symmetrically domed tent by additional stitching or the like, or by manufacturing tent 10 with seams 20 already tailored, to force the tubes into profiles 32 and 34 respectively, as the tubes are inflated through one of the one-way valves 30 to 20-30 pounds pressure, the criss-crossed tubes support one another and constrain the direction of bowing of the tubes to a direction generally along centroidal axis A. Tent 10 is thus self-erecting and self-stabilizing as it is erected. Apex 22 is elevated upwardly along axis A urged by the uplifting forces resultant of the criss-crossed tubes being inflated and the uplifting urging resultant of the design of the ends of the tubes as better described below. When maximum inflation is achieved the tubes are held in relatively stable crossed juxtaposition to support the tent. As seen in Figures 2 and 3, sleeves 16, which are non-resilient, advantageously made of fabric or the like, contain snugly therein resilient tubes 38. Resilient tubes 38 may be made of rubber. As better seen in Figure 4, the ends of resilient tubes 38 have a folded section 40 folded over and laid back against the adjacent portion of the resilient tube and secured thereto by adhesive layer 42. An adhesive layer 44 adheres the sides of the tube forming folded section 40 together. Cavity 46 within resilient tubes 38 thus extends along side folded section 40 and terminates at fold line 48. The ends of resilient tubes 38 above described, are positioned within corresponding ends of sleeves 16, one of which is better depicted in Figure 6. As seen in Figures 5 and 6, in one preferred embodiment, a resilient cylindrical boot 52 is used to encapsulate the end of resilient tube 38 and folded section 40 within tubular cavity 54. The end of resilient tube 38 adjacent folded section 40, and folded section 40 are secured within tubular cavity 54 by adhesive layer 56, where it is understood that adhesive layers 42, 44 and 56 are of an appropriate adhesive which remains resilient when cured. Resilient boot 52 may have extending from an end thereof a resilient flange 58. Flange 58 serves to anchor resilient boot 52 within the end of sleeve 16 by sandwiching resilient flange 58 between the sides of the stitched closed end 16a of sleeve 16 as better seen in Figure 6. The end 16a of sleeve 16 may be stitched closed and folded over so that it may be releasably secured to a comer of the material of tent floor 10a by means of releasable fasteners such as the button snap 60 illustrated. The above-described inflatable supports may thus exhibit an important characteristic, namely, that when inflation begins, as air flow reaches the ends of the supports, the result is an uplifting. Since the ends are sealed and air pressure is introduced, and since the bottom part of the sleeve is secured to the tent floor at the very end and with the tent floor advantageously pegged down, the sleeve, as it begins to inflate, begins to push against the tent floor as seen in Figure 6a. By so pushing, the inflatable support is urged so as to pivot about sleeve end 16a upwardly. Sleeve end 16a functions as a flap hinge. This assists in self- erecting of the tent. The more air pressure is added, the more the resultant force "F" helps the tent to self-erect. Further, the greater the maximum air pressure, the greater the rigidity of the tent structure. Since the design of the rubber bladder is made so that the end of the supports become stronger with more pressure, the uppermost limit of the air pressure that the inflatable support will sustain is primarily only limited by the tensile strength of the sleeve material, rather than the pressure at which the sealed ends of the inflatable tube will fail. Figures 8 and 9 illustrate how an inflatable tent fly 62 may be suspended over tubes 12 and 14 and tent 10. A single inflatable ridge pole tube 64 (shown in dotted outline in Figure 8), identical in construction to tubes 12 and 14 is fastened at about its mid-length to fly 62 or to tube 12 at apex 22. When inflated, tube 64 rises at both ends to form a ridge pole. Tube 64 thus elevates fly 62 facilitating entry into the tent while providing an air space which, in turn, allows a free flow of air between the tent wall and the fly, just as a fly does with conventional rigid tent poles. The comers of the fly may be attached to the tent comers, just as they are with conventional rigid tent poles, or otherwise secured to the ground by lines or pegs. As seen in Figure 10, fly 62 may be modified to provide a vestibule or extension 66. Vestibule 66 may be supported by an inflatable auxiliary vestibule tube 68 shown in dotted outline. Vestibule tube 68 extends around a vestibule doorway 70. Vestibule tube 68 may be maintained upright by means of mounting tube 68 to a ridge pole tube 64 or the like or by means of a conventional pegged guy wire 72. In the preferred embodiment, each resilient tube 38 is an elongate unitary resilient tube. In a further embodiment resilient tubes 38 may be bicycle inner tubes such as readily available 28 inch diameter by 2.125 inch cross section bicycle inner tubes. These inner tubes are cut so as to form an elongated length when straightened. A plurality of such tubes may be joined end to end by resilient adhesive. Thus may be formed tubes 12 and 14 having no rigid components. In a typical 7 foot by 7 foot or other conventionally sized tent structure, using two inflatable supports, at least five bicycle tubes will be required to form the two tubes 12 and 14, that is, at least 2 1/2 bicycle tubes per inflatable support. In forming the tubes using the bicycle inner tubes, the inner tubes, once cut and straightened, are overlapped at their ends and glued by using an inner form or block (not shown) slid snugly into the ends of the inner tubes. The form or block, which may be advantageously cylindrical in shape, provides a bearing surface against which the inner tube material presses until the adhesive sets so as to form a seal around the ends of the adjacent bicycle inner tube. As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.

Claims: WHAT IS CLAIMED IS: 1. An inflatable self-erecting tent comprising: when erect , substantially vertical circumferential first and second profiles intersecting, at corresponding first and second vertices thereof, a common vertical axis. said first and second profiles radially spaced apart about said common vertical axis, a first inflatable tube mountable to said first profile, a second inflatable tube mountable to said second profile, wherein said first and second profiles extend circumferentially over said tent from opposite ground engaging edges of said tent, and wherein said first and second profiles have corresponding circumferential first and second distances and wherein said first and second inflatable tubes are of substantially the same length, and wherein said first and second distances are substantially the same, and wherein said first and second profiles do not intersect each other, said first vertex of said first profile above second vertex of said second profile. 2. The tent of claim 1 wherein said first and second inflatable tubes are, when mounted to said canopy along said first and second profiles, pneumatically interconnected by a flexible air conduit extending therebetween. 3. The tent of claim 2 wherein said first and second inflatable tubes are resilient tubes, and said first and second profiles further comprise corresponding non-resilient sleeves extending circumferentially therealong for sliding mounting of said inflatable tubes in journalled relation therethrough. 4. The tent of claim 3 wherein said first and second tubes are self-sealing by self-sealing ends of said tubes, said ends folded over onto themselves and mounted within said sleeves. 5. The tent of claim 3 wherein said first and second tubes are adapted, when mounted in said sleeves, to contain air pressurized to approximately 20 pounds per square inch. 6. The tent of claim 1 wherein said first profile is an arch and said second profile approximates a semi-circle. 7. The tent of claim 1 wherein said first and second tubes are mountable by releasable fasteners to said first and second profiles. 8. The tent of claim 1 wherein said first and second profiles are mountable to a tent canopy of said self-erecting tent. 9. The tent of claim 1 further comprising an inflatable vestibule tube mountable around an opening aperture of a tent vestibule of said self-erecting tent. 10. An inflatable self-erecting tent comprising: when erect, substantially vertical circumferential first and second profiles intersecting, at corresponding first and second vertices thereof, a common vertical axis, said first and second profiles radially spaced apart about said common vertical axis, a first inflatable tube mounted to said first profile, a second inflatable tube mounted to said second profile, wherein said first and second profiles extend circumferentially over said tent from opposite ground engaging edges of said tent, and wherein said first and second profiles have corresponding circumferential first and second distances and wherein said first and second inflatable tubes are of substantially the same length, and wherein said first and second distances are substantially the same, and wherein said first and second profiles do not intersect each other, said first vertex of said first profile above second vertex of said second profile. 11. The tent of claim 10 wherein said first and second inflatable tubes are, pneumatically interconnected by a flexible air conduit extending therebetween. 12. The tent of claim 11 wherein said first and second inflatable tubes are resilient tubes, and said first and second profiles further comprise corresponding non-resilient sleeves extending circumferentially therealong for sliding mounting of said inflatable tubes in journalled relation therethrough. 13. The tent of claim 12 wherein said first and second tubes are self-sealing by self-sealing ends of said tubes, said ends folded over onto themselves and mounted within said sleeves. 14. The tent of claim 12 wherein said first and second tubes are adapted, when mounted in said sleeves, to contain air pressurized to approximately 20 pounds per square inch. 15. The tent of claim 10 wherein said first profile is an arch and said second profile approximates a semi-circle. 16. The tent of claim 10 wherein said first and second tubes are mounted by releasable fasteners to said first and second profiles. 17. The tent of claim 10 wherein said first and second profiles are mounted to a tent canopy of said self-erecting tent. 18. The tent of claim 10 further comprising an inflatable vestibule tube mounted around an opening aperture of a tent vestibule of said self-erecting tent. 19. An inflatable, pegged, self-erecting tent comprising an inflatable tube mounted to a canopy of said tent along a ridge-line thereof, said canopy having circumferential ground-engaging edges adapted for pegged anchoring of said edges to a ground surface, said ridge-line extending over said canopy from one of said edges to an opposite edge of said edges. 20. The tent of claim 19 wherein each end of said tube has a flexible flap hinge mounted thereto oriented so that a lower flap, mounted to said canopy, of said flap hinge is disposed below and adjacent said each end of said tube and is directed inwardly of said flap hinge, towards a center of said tent, whereby inflation of said tube urges rotation of said each end of said tube upwardly about said flap hinge relative to said lower flap.

Inventors: TURCOT JEAN-MARC DANIEL, TURCOT JOHN ROBERT, TURCOT, JEAN-MARC, DANIEL, TURCOT, JOHN, ROBERT
Applicants: TURCOT JEAN MARC DANIEL, TURCOT JOHN ROBERT, TURCOT, JEAN-MARC, DANIEL, TURCOT, JOHN, ROBERT
Application year: 2000
Main classification: E04H15
IPC codes: E04H15