Elevator safety apparatus for bi-directional braking in an overspeed condition
CA 2032214 C · Owner: Korhonen, Helge · Inventors: Korhonen, Helge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An elevator safety apparatus is disclosed which is designed to be mounted on an elevator car, which car moves along guide rails; said apparatus comprising a frame, an area for wedge housings formed in the frame and wedges, placed in the wedge housings on each side of a guide rail; said wedges gripping the guide rail when the safety apparatus is activated the wedges being placed relative to, each other such that the wider end of one wedge points upwards while the wider end of the second wedge points downwards. To allow safety apparatus action in both an upward and downward direction, the apparatus is provided with an activating means connected to and moving both wedges, and an overspeed …
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 December 13, 1990 and granted January 16, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2012.
- 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.