Adjustable height load bearing support structure
CA 2252936 C · Owner: Hon Industries Inc. · Inventors: Machael, Jay R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A counterbalanced adjustable height load bearing support structure (20) with a pretensioning mechanism comprises a pair of pivotable arms (42 42) each , having a free end (44) in engagement with a support assembly (24) and being biased by a torsion spring (40). A lever arm (154) is connected to each torsion spring (40) and exerts a biasing force on the pivotable arm (42) when the lever (154) is rotated, thereby preloading the springs. A cable (122) connects the lever arms and passes over a central bushing (170). The bushing (170) receives a threaded shaft (150) which may be turned to move the bushing and thereby adjust the tension in the cable. Because the cable (122) is capable of …
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
- Filed October 10, 1997 and granted May 6, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2019.
- 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.