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| Structure and method for restraining motion of a marine structure |
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| Air-vapor barrier continuity device |
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| Two piece sheet metal capstan housing assembly method |
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Module for expandable truss structure and expandable truss structure employing said module
| Details |
Inventors: Tanizawa, Kazuo; Nakagawa, Jun;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Raduazo; Henry E.
Assistant Examiner:
Attorney, Agent or Firm: Wolf, Greenfield & Sacks
A module for an expandable truss structure which defines one unit of the structure and which is capable of being transformed from a folded state to a deployed state is disclosed. A wire is tensely stretched between each pair of adjacent vertices of each tetrahedral module when the truss structure is deployed to thereby eliminate looseness from the joints of the constituent members. Accordingly, it is possible to obtain high rigidity with ease. Further, synchronous beams for effecting synchronous deployment and a compression spring for supplying energy for deployment are incorporated to allow reliable deployment to be achieved and also to enable the truss structure to be deployed without the aid of any external force. Also disclosed is an expandable truss structure composed of a plurality of interconnected expandable truss structure modules of the type described above. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a module for an expandable truss structure which is capable of being transformed from a folded state to a deployed state, and an expandable truss structure employing this module.
It is another object of the present invention to provide a module for an expandable truss structure which exhibits high structural stability and high rigidity in a deployed state, and an expandable truss structure employing this module.
It is still another object of the present invention to provide a module for an expandable truss structure which is light in weight and is able to be folded into a compact size and readily deployed, and an expandable truss structure employing this module.
It is a further object of the present invention to provide a module for an expandable truss structure which is easy to produce and assemble, and an expandable truss structure employing this module.
To these ends, the present invention provides a module for an expandable truss structure which defines one unit of the structure and which is capable of being transformed from a folded state to a deployed state, the module comprising: a stem; a first coupler secured to one end of the stem and having a pin joint portion; a slide hinge slidably mounted on the stem, the slide hinge being movable in the axial direction of the stem; at least three ribs each pinned at one end thereof to the slide hinge, the ribs being deployable radially about the axis of the stem; a second coupler pinned to the other end of each of the ribs and having a pin joint portion; slide hinge lock means for stopping and locking the slide hinge at a predetermined position on the stem when the module is deployed; an intermediate member for connecting the pin joint portion of the first coupler and the pin joint portion of each of the second couplers, the intermediate member having a length sufficient to stop the corresponding rib so that the corresponding rib extends substantially at right angles to the stem when the, module is deployed; and a tension member provided between each pair of adjacent second couplers in such a manner that the tension member is tensely stretched between the pair of second couplers when the module is deployed
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