Couplers
CA 2252448 A1 · Owner: Legge, Philip · Inventors: Legge, Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A right-angle scaffold coupler comprises two jaw assemblies (10A 10B) each , with jaws formed by a closure-plate (12) hinged to a common chassis (11) and , having a hand lever (14) hinged (at 21) to the plate (12) with a spirallycoiled spring (25, Figure 4) as hinge-pin within interleaved finger-lugs (26 27). A hook-member (15) hinged to the lever (14) engages a lip (19) of the chassis (11) so that depression of the lever (14) pulls the plate (12) towards the chassis (11) in closing the jaws onto a scaffolding tube (13) and clamping to it by over-centre action. The spring (25) coils up more tightly during the over-centre action allowing resilient displacement between the lugs (26 27) , …
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 May 8, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 8, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 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.