Automatic control of work platforms
CA 1288149 C · Owner: Fitzgerald, Frederick P. · Inventors: Fitzgerald, Frederick P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to the automatic control of work platforms and in particular to a circuit means that provides a safe operation and automatic relevelling of a work platform that is being raised and lowered by electrically powered hoists. Angle sense means are used to detect out of level orientations of the platform either along the longitudinal or transverse axis of the platform. When the angle sense means signals are interpreted by the circuit means appropriate hoist control signals stop the travel of the platform for a pre-determined period control the, hoists to bring the lowest portion of the platform up into a substantially level position, stop the travel of the platform for a …
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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 August 27, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 27, 2008.
- 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.