초록 ▼

A louvre assembly between two transparent covers of a housing comprises lightweight louvres suspended and pivoted by lightweight filaments. A counterbalanced beam for pivoting the louvres can be operated by an electrical driving arrangement such as one including a piezoelectric bimorph driver. The e

A louvre assembly between two transparent covers of a housing comprises lightweight louvres suspended and pivoted by lightweight filaments. A counterbalanced beam for pivoting the louvres can be operated by an electrical driving arrangement such as one including a piezoelectric bimorph driver. The electrical power for operating the driver may be obtained from solar cells. A louvre guide system spaces the louvres from the transparent walls of the housing and guides the louvres.

대표청구항 ▼

A Venetian blind construction comprising: an enclosed housing having first and second spaced light transparent walls through which rays of light may pass, a louvre array within said housing between said walls including a plurality of spaced parallel louvres secured for rotation about parallel axes,

A Venetian blind construction comprising: an enclosed housing having first and second spaced light transparent walls through which rays of light may pass, a louvre array within said housing between said walls including a plurality of spaced parallel louvres secured for rotation about parallel axes, said louvres permitting said rays to pass through said Venetian blind when in one orientation and blocking said rays when in a second orientation, means coupled to said louvres for preventing their edges from touching the walls of said housing, and drive means secured to said housing and coupled to said louvres for opening and closing said louvres, said drive means including support means coupled to said housing and having a notch therein extending parallel to said axes, a beam with a knife edge, said beam having its knife edge in said notch parallel to said axes for pivotally securing the beam to the support means for rotation about a pivot axis defined by said knife edge and parallel to said axes, and filaments secured to said beam in spaced relation to said knife edge and to said louvres for rotating said louvres about said parallel axes in response to the rotation of said beam about said pivot axis, said beam including a drive arm offset from said pivot axis and a counterweight for counterbalancing said drive arm with respect to said pivot axis.