Knee-action chair control
CA 1291940 C · Owner: Sulzer, James H. · Inventors: Sulzer, James H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A knee-action chair control for a pedestal chair base comprises a base plate, a seat support plate pivotally mounted on the front of the base plate, a pair of compression springs operable between the plates for biasing the seat support plate toward an at-rest position relative to the base plate and a, novel adjustable spring preload mechanism operable between the base plate and one end of the compression springs. Additionally, there is an assembly locking plate removably mounted on the seat plate and engageable with the base plate for determining the at-rest position of the seat plate. Removal of the assembly locking plate during assembly of the control enables the compression springs and …
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 November 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 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.