Shade operator
CA 1292671 C · Owner: Heli-X Shade Corporation · Inventors: Wilk, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shade operator includes a drive unit having a central stud forming the axis of rotation for the shade roller. A manually operable pulley is mounted on the stud and is engageable with a coil spring clutch member mounted about the stud coaxial with the pulley. The shade roller is engaged by a bushing which is also mounted for rotation on the stud. The bushing is provided with a projection which engages the clutch spring due to the weight of the shade and causes the spring to further grip the stud to prevent rotation. Operation of the pulley engages the spring such that its grip on the bushing is loosened which allows the, spring, bushing and shade roller to be driven by the pulley as …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 3, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.