HAND OPERATED WINDOW COVER SYSTEMS
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United States of America Patent
Stats
-
May 13, 2014
Grant Date -
Nov 28, 2013
app pub date -
Jun 14, 2013
filing date -
Nov 4, 1997
priority date (Note) -
Granted
status (Latency Note)
Importance
Abstract
A spring drive system useful for window covers is disclosed, which comprises one or more coil spring drives or flat spring drives and the combination whose elements are selected from one or more of a group which includes (1) a band or cord transmission which provides varying ratio power transfer as the cover is opened and closed; (2) gear means comprising various gear sets which provide frictional holding force and fixed power transfer ratios; (3) a gear transmission which provides fixed ratio power transfer as the cover is opened or closed; (4) crank mechanisms; (5) brake mechanisms; and (6) recoiler mechanisms. The combination permits the spring drive force to be tailored to the weight and/or compression characteristics of an associated window cover such as a horizontal slat or pleated or box blind as the cover is opened and closed.
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