Locking device for the positive holding of a cover or grate in a frame
CA 1294475 C · Owner: Galvanetto, Francois · Inventors: Galvanetto, Francois; Spiess, Hansruedi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a cover-frame assembly for a manhole or the like a locking device is provided, which comprises a closing member having at least two horizontal arms and a mounting rod provided with a bearing and actuating device. The mounting rod and the bearing and actuating device are located in a bore having a widened bore portion, whereby a shoulder is formed on which is, supported a bearing surface of the bearing and actuating device. The ends of the arms each project into a guide link which is, shaped on the inner flange of the frame. The guide link has an inclined flank, by means of which the arms are increasingly elastically deformed. In the closed position of the locking device, the arms engage …
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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 January 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
- 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.