WO2008114092A1 - Support de hamac de tenségrité, pliable et tout terrain - Google Patents

Support de hamac de tenségrité, pliable et tout terrain Download PDF

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Publication number
WO2008114092A1
WO2008114092A1 PCT/IB2007/050933 IB2007050933W WO2008114092A1 WO 2008114092 A1 WO2008114092 A1 WO 2008114092A1 IB 2007050933 W IB2007050933 W IB 2007050933W WO 2008114092 A1 WO2008114092 A1 WO 2008114092A1
Authority
WO
WIPO (PCT)
Prior art keywords
hammock
tensegrity
struts
collapsible
assembly
Prior art date
Application number
PCT/IB2007/050933
Other languages
English (en)
Inventor
Geoffrey Frankson
Original Assignee
Geoffrey Frankson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Geoffrey Frankson filed Critical Geoffrey Frankson
Priority to PCT/IB2007/050933 priority Critical patent/WO2008114092A1/fr
Publication of WO2008114092A1 publication Critical patent/WO2008114092A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45F—TRAVELLING OR CAMP EQUIPMENT: SACKS OR PACKS CARRIED ON THE BODY
    • A45F3/00—Travelling or camp articles; Sacks or packs carried on the body
    • A45F3/22—Hammocks; Hammock spreaders
    • A45F3/24—Stands; Supports

Definitions

  • the present invention relates to the field of hammock support structures, but more particularly to those said structures which embrace the tensegrity hypothesis, having multifarious parts, with ease of assembly and disassembly, lightweight in character and economically priced, thereby optimizing costs of manufacture, packaging, storage, handling and shipping.
  • hammock structures are usually suspended from two spaced apart connector points.
  • a hammock connecting ring where there are no natural and properly spaced objects such as trees, walls or posts may be used.
  • portable hammock supports or stands are employed.
  • one quite popular type of stand is a “sled” type structure, which employs two spaced apart rails with raised ends which each meet at a common point above ground. These ends contain rings or S hooks for securing the ends of the hammock.
  • the foot connector assembly comprises a single four footed crosspiece, to which is welded a single "C" shaped bent tube, which is placed with a concave surface upwardly.
  • the tube is welded at a plurality of joints, to the crosspiece to form the foot. Both ends of the tube are tapered with a smaller end and a somewhat enlarged medial section, so that the central rib pipe and the upstanding arm may fit thereon.
  • the scapula for example, fixed in space by the tension of its muscles, ligaments and fascial envelope, functions as the connecting link between the spine and the upper arm.
  • the main object of the present invention is to provide a tensegrity hammock structure assembly, with different operating principles and component parts from that of the prior art, for ease of assembly, disassembly, economical manufacturing, packaging, handling and transport costs.
  • the main difference between these said dual types of stress-supported structures is that the forces balanced at each node, include only tensile forces in the former case, but both compressive and tensile forces in the latter case. Despite this distinction, both share the same central mechanism by which they develop restoring forces that oppose changes of shape, namely, the prestress.
  • Tensegrity structures such as that of the present invention are fully triangulated and, therefore, there are no bending movements in these structures, just tension and compression and therefore significantly less loads to be reckoned with.
  • the present invention as a tensegrity structure, is an omni-directional load distributor.
  • the tension elements always remain in tension and the compression elements always remain in tension, no matter in what direction the load is applied. By contrast, this is not so in a column or a lever, which are rigidly oriented to resist a load from a specific direction. Therefore, because the loads in tensegrity structures such as that of the present invention are distributed all the time, each structural element can be lighter.
  • Grant (1952) used a tension model to suspend the body, hammock like, when it hangs between gymnastic parallel bars. However, hammock like suspension is unidirectional. Turn the hammock or suspension bridge over and, not only does everything fall out of the hammock or off the roadbed, the hammock or roadbed also collapses.
  • a tensegrity hammock support structure such as that of the present invention, can have one point of support coming from any direction and still maintain its structural integrity.
  • the internal elements remain solely in tension or compression with no movements at the joints.
  • the bones which "float" in the tension network of soft tissue are only being compressed. There are no movements at the joints because the structure is fully triangulated.
  • the shoulder becomes inherently stable and changes position only when one of the elements of the triangle is shortened or lengthened. Therefore, considerably less energy is needed to "stabilize" the joints.
  • FIG.1 is an isometric view of the tensegrity hammock structure assembly of the present invention.
  • FIG. 2 is a fragmentary exploded perspective view depicting one end of a tensegrity hammock structure assembly of the preferred embodiment.
  • FIG. 3 is an overhead perspective view of a preferred embodiment of a tensegrity hammock structure assembly of the present invention providing support for a sunshade.
  • FIG. 4 is an isometric view of a preferred embodiment of a tensegrity hammock structure assembly of the present invention collapsed and folded for ease of transportation.
  • FIG. 5 is an isometric view of a preferred embodiment of a tensegrity hammock structure assembly of the present invention reset to be used as support for a table.
  • FIG. 6 is an overhead perspective view of a preferred embodiment of a tensegrity hammock structure assembly of the present invention providing support for a tent.
  • tensegrity has come to mean different things to different investigators. Remarkably, these differences have never been articulated and accordingly, have spawned at least a part of the controversy surrounding the hypothesis. In structural mechanics, for example, a clear distinction is made between tensegrity structures and other stress-supported structures.
  • tensegrity structures Structures in which the prestress is balanced predominantly by internal struts are called tensegrity structures. This is referred to as the structural form of the hypothesis, which then identifies tensegrity as a subclass of the more general family of stress- supported discrete structures.
  • the tensegrity hammock structure assembly of the present invention includes front and rear legs spaced apart from each other in a longitudinal direction, each of said legs having left and right ends and is a tensegrity structure consisting of a discontinuous set of compressed components inside a continuum of tensioned components - including the hammock when occupied.
  • the counteracting forces of tension and compression result in a stable system that has the ability to yield increasingly to external pressure without breaking.
  • the hammock of the present invention hangs from and pulls upon the upper ends of two equidistant uprights, each consisting of struts and cords which are held together by opposing tension and compression, as outlined in the tensegrity theory of Richard Buckminster Fuller.
  • the struts of the present invention are not rigidly fastened together, but are held in position by the tension in the cords and if any component be removed, the said structure in its entirety would collapse.
  • the weight of the occupant of the tensegrity hammock assembly is ultimately supported by the stiffness of the centre of the elevated horizontal strut, which connects the equidistant supports.
  • stiffness in accordance with given tensegrity theory, is the net result of the opposing compression (of the upper side) and existent tension (in the lower side) of the elevated horizontal strut which stiffness must be sufficient to keep the strut above the surface, since contact affords a fulcrum for the pull of the hammock on the supports which then become unstable.
  • the shape of the structure is variable, depending on the lengths of the struts and cords; while the strength and stability depend on the tensional interactions between them.
  • the prestress in the system particularly the tension in the hammock
  • the structure maintains the structure. Remove any component and the entire structure collapses. Apply pressure (i.e. sit in the hammock) and the whole structure compresses with coupled, symmetrical movements that uniformly increase its stability.
  • the push-pull parts inherently triangulate and eliminate the torque in the opposing angles at the two ends of the horizontal bar.
  • the stress created by the gravitational pull on the occupant of the hammock is directed to the centre of the bar.
  • the mechanical stability of the structure of the present invention is a result of the way in which the structure balances and distributes stress rather than on the inherent strength of the individual components.
  • the resistance to stress depends almost entirely on the stiffness of the elevated horizontal bar which ideally will yield up to the point of contact of the centre of the said bar with the ground (at which point the said structure becomes unstable, since a new leverage fulcrum is thereby introduced).
  • the components can be made of light material. Since the shape of the structure is variable, the components can be of variable length, once cross-sectional symmetry is maintained. Since the struts are not rigidly attached to each other, the structure can be collapsed and folded to allow ease of transport.
  • the tensegrity hammock assembly is a tensegrity structure consisting of a discontinuous set of compressed components inside a continuum of tensioned components - including the hammock itself.
  • the counteracting forces of tension and compression result in a stable system that has the ability to yield increasingly to external pressure without breaking.
  • Strut 8 is raised off the surface on the inner ends of struts 4 and 5 at an angle to allow room for the belly of the hammock.
  • the elevation of strut 8 is maintained by the tension in the cords which tighten as downward pressure is applied through the struts when the tensegrity hammock structure is occupied.
  • Cord 3 is actually an extension coil spring which, while maintaining the tension of the tensegrity structure, allows a degree of downward movement of struts 2 and 3 and consequently an inward movement of the upper end to which the hammock is tethered. The resulting oscillation enhances the relaxation experienced by the occupant of the hammock.
  • the mechanical stability of the present invention is a result of the way in which the structure balances and distributes stress rather than on the inherent strength of the individual components.
  • the resistance to stress depends almost entirely on the stiffness of the elevated horizontal bar which ideally will yield up to the point of contact of the centre of the bar with the ground (at which point the whole system becomes unstable since a new leverage fulcrum is thereby introduced).
  • the components can be made of light material. Since the shape of the structure is variable, the components can be of variable length, once cross- sectional symmetry is maintained, as demonstrated in Fig. 1 and 2. Since the components are not rigidly attached to each other, the structure can be collapsed and folded to allow ease of transport as demonstrated in Fig. 4.
  • central strut can be raised to alternatively provide support for a table instead of a hammock without compromising stability, as depicted in Fig. 5.

Landscapes

  • Tents Or Canopies (AREA)

Abstract

La présente invention concerne le domaine des structures de support de hamac mais, plus particulièrement, lesdites structures qui adoptent l'hypothèse de tenségrité, ayant de nombreuses pièces, aisées à monter et à démonter, et de caractère léger. L'ensemble d'hamac de tenségrité est une structure de tenségrité consistant en un ensemble discontinu de composants comprimés à l'intérieur d'un continuum de composants mis en tension - y compris le hamac lui-même. Les forces antagonistes de tension et de compression conduisent à un système stable qui a l'aptitude à céder de façon croissante à la pression externe sans se rompre. Comme représenté sur la Figure 1, l'ensemble de structure de hamac de tenségrité de la présente invention comprend des pieds avant et arrière supportant des montants et espacés entre eux dans une direction longitudinale, chacun desdits pieds ayant des extrémités gauche et droite. Le hamac de la présente invention est suspendu depuis les extrémités supérieures de deux montants équidistants et tire sur celles-ci, chacun consistant en étais et cordons et qui sont maintenus ensemble par l'opposition d'une tension et d'une compression. Le poids de l'occupant de l'ensemble de hamac de tenségrité est finalement supporté par la rigidité du centre d'un étai horizontal élevé (8), qui relie les montants équidistants. Etant donné que la forme de la structure est variable, les composants peuvent être de longueur variable, une fois qu'une symétrie transversale est maintenue. Etant donné que les étais ne sont pas rigidement fixés entre eux, la structure peut être affaissée et pliée pour permettre un transport aisé. Le seul contact avec le sol se situe aux quatre angles de la structure, ce qui permet un usage sur des surfaces inégales. La stabilité latérale des extrémités supérieures des supports permet à des accessoires d'être fixés, tels qu'un parasol ou une tente. L'étai central peut être surélevé pour fournir en variante un support pour une table au lieu d'un hamac, sans compromettre la stabilité de la structure.
PCT/IB2007/050933 2007-03-18 2007-03-18 Support de hamac de tenségrité, pliable et tout terrain WO2008114092A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2007/050933 WO2008114092A1 (fr) 2007-03-18 2007-03-18 Support de hamac de tenségrité, pliable et tout terrain

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2007/050933 WO2008114092A1 (fr) 2007-03-18 2007-03-18 Support de hamac de tenségrité, pliable et tout terrain

Publications (1)

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WO2008114092A1 true WO2008114092A1 (fr) 2008-09-25

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PCT/IB2007/050933 WO2008114092A1 (fr) 2007-03-18 2007-03-18 Support de hamac de tenségrité, pliable et tout terrain

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013024323A1 (fr) * 2011-08-14 2013-02-21 Geoffrey Frankson Support de hamac portable
US11388977B2 (en) 2019-10-22 2022-07-19 Yellow Leaf Hammock, LLC Compact collapsible hammock stand

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1183366A (fr) * 1957-09-25 1959-07-07 Support démontable pour hamac
US4691394A (en) * 1986-12-18 1987-09-08 Chi Goo Woo Collapsible hammock
DE20110262U1 (de) * 2001-06-25 2001-09-20 Mayr, Stefan, 33659 Bielefeld Transportables Traggestell
US6418577B1 (en) * 2001-08-06 2002-07-16 Michael Murphy Portable hammock
US6665896B1 (en) * 2002-09-09 2003-12-23 Shin Yeh Enterprise Co., Ltd. Hammock assembly with foldable left and right frames
WO2006081607A1 (fr) * 2005-02-04 2006-08-10 Joseph Askey-Doran Support de hamac

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1183366A (fr) * 1957-09-25 1959-07-07 Support démontable pour hamac
US4691394A (en) * 1986-12-18 1987-09-08 Chi Goo Woo Collapsible hammock
DE20110262U1 (de) * 2001-06-25 2001-09-20 Mayr, Stefan, 33659 Bielefeld Transportables Traggestell
US6418577B1 (en) * 2001-08-06 2002-07-16 Michael Murphy Portable hammock
US6665896B1 (en) * 2002-09-09 2003-12-23 Shin Yeh Enterprise Co., Ltd. Hammock assembly with foldable left and right frames
WO2006081607A1 (fr) * 2005-02-04 2006-08-10 Joseph Askey-Doran Support de hamac

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013024323A1 (fr) * 2011-08-14 2013-02-21 Geoffrey Frankson Support de hamac portable
US11388977B2 (en) 2019-10-22 2022-07-19 Yellow Leaf Hammock, LLC Compact collapsible hammock stand

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