Double cylinder safety lock
CA 1059777 A · Owner: Schlage Lock Company · Inventors: Neary, Ralph E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A double cylinder safety lock has a bolt projected and retracted by a device having a rotatable hub. A key operated exterior device has a lost-motion connection to the rotatable hub so the key can be extracted from the device with the bolt in projected position or retracted position. A key operated interior device has either a direct or a lost-motion connection (depending upon the key used) to the rotatable hub the hub connections, being arranged to turn together. A key for the interior device can project and retract the bolt but can be extracted only when the bolt is in retracted position.
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 August 7, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 7, 1996.
- 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.