Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – With mounting or supporting means
Patent
1998-07-24
2000-10-24
Purol, David M.
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
With mounting or supporting means
160171R, E05F 1100
Patent
active
06135189&
ABSTRACT:
Constant balance of a varying load, particularly a window shade or blind, is maintained by providing a lifting force, preferably from a spring, through a mediating mechanism comprising a variable pitch screw assembly, such that the mechanical advantage of the mediating mechanism changes to allow the continuously decreasing spring force to apply an appropriate lifting force at all times. A variable pitch screw thread is formed as grooves in a cylindrical blank. The grooves are engaged by pins in a nut which thereby accomodates the variable pitch of the screw. A compact blind tilting mechanism is also incorporated. The capacity of the mechanism can be increased by linking several screw assemblies.
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