Flexible or portable closure – partition – or panel – Automatic control – Nonfusible thermal initiator
Patent
1991-12-12
1994-01-04
Purol, David M.
Flexible or portable closure, partition, or panel
Automatic control
Nonfusible thermal initiator
1601761, E05F 1520
Patent
active
052752194
ABSTRACT:
A louvered window covering, such as a vertical or horizontal venetian blind, is provided with a thermal actuator to automatically rotate slats forming the louvered window covering between open and closed positions. The actuator includes at least one memory alloy spring that, when heated above a predetermined temperature, extends to engage and move a rack that drives a pinion gear. The pinion gear rotates, through a coupling mechanism, a rod extending the length of the blind. A second memory alloy spring may be installed to rotate the rod in the opposite direction. The rod intercouples the slats in a rewiner such that the rotation of the rod rotates the slats in unison between closed and open positions. The memory alloy spring may be heated with a current supplied to a controller in response to a predetermined environmental condition.
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