A speaker structure comprising a tetrahedronal shell having an upper end and an equilateral triangular base with equisized triangular walls and with the margins of the adjacent walls and base being secured together and wherein one of the walls includes a pattern of port openings and these openings are arranged about a central opening spanned by a speaker which is fixed thereabout.

An armrest structure for a vehicle seat. The armrest structure includes a support attached to the side of the vehicle seat, an armrest, and an adjustment structure connecting the support and armrest. The armrest is movable vertically and, in the lowermost travel position, forms an enlargement of the seat portion of the vehicle seat. The armrest is pivotable on the adjustment structure into an upright position.

An offshore structure is provided for handling cryogenic fluids such as liquefied natural gas. The structure comprises a lower section of concrete and an upper section which projects up from the lower section above the sea level to support a deck superstructure. The lower section is formed of a plurality of cells and at least one of the cells houses an insulated tank for the storage of low temperature fluids. The tank or tanks are completely submerged when in operation and are rigidly supported ...

Gutter lengths having a semicircular cross-section and upwardly extending sides, with curled or similarly bent upper edges, and coupling elements having portions adapted for tightly engaging the ends of the gutter lengths, are assembled together to form a gutter structure. At least one of the coupling elements, designed to compensate for the thermal changes in the gutter length, is fitted with a downspout.

A scaffold structure comprising a tubular column positioned vertically in use by a base support for supporting a base end portion of the column. Top supporting structure supports a top end portion of the tubular column and is effective to maintain the column vertical in use. The base support and top support impart torsional rigidity to the tubular column. A positionable platform assembly having a platform for standing thereon is positionably mounted on the column for positioning the platform at ...

Foil, wire and similar coherent bodies of catalytic metal are provided with catalytically active surfaces by diffusing a chemically removable metal such as aluminum or zinc into those surfaces and then selectively dissolving out at least about a third of the removable metal. Platinum wire screens activated in this way make effective exhaust catalysts for automotive engines.

A findings structure for maintaining a spool and a bobbin with like filaments thereon in assembled relationship. The spool and bobbin are each provided with axial bores for support of each on a spindle for the use of each, and they are maintained in assembled relationship for storage by means extending into the aligned bores, such means having resilient filamentous material extending therefrom gripping the sides of said aligned bores. The assemblies of the bobbins and spools may be joined by a f...

The invention relates to a floating structure, e.g. an offshore platform adapted for use in exploitation of submerged oil fields and the like purposes at offshore areas. The structure has a platform from which extended downwardly are columns carried by footings having buoyancy large enough to keep the platform afloat. Tension wires are extended through the footings for connection to the sea bottom in a diverging manner. Sinkers are provided at intermediate portions of respective tension wires so...

An air structure comprises a double-skin wall construction having an outer skin that is substantially transparent to short wave solar radiation but relatively opaque to long wave heat radiation and an inner skin. Radiation converter elements, preferably in the form of black plastic diaphragms linking the inner and outer skins and effective to absorb solar radiation and to convert the same to heat energy are disposed in the inter-skin space. The structure is self-erecting on exposure to solar rad...

A novel hinge of flexible material is provided which comprises a pair of end sections and an intermediate connecting section. The end sections are securable through various means including hook and loop filament material to one face of a structural element and to an oppositely-facing surface of a second structural element to permit movement of the two elements through approximately 360.degree. relative to each other.