Elevator propulsion (or drive) with control device for smooth (or jerk-free) start-up
CA 1290476 C · Owner: Inventio Ag · Inventors: Klingbeil, Klaus-Jurgen; Woyciel, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This control device suppresses the jerk (or jolt) at the start-up of speed controlled elevator installations in both directions of travel, not only the friction jerk (or jolt) at the transition from the static friction (RH) to the sliding friction (RG) but also the imbalance jerk (or jolt) at unbalanced car load. For this a nominal value multiplier (39) is connected to the output side of a nominal value transmitter (14) in the drive control; the multiplying factor m (of the multiplier (39) ) can be con trolled by way of an on-/off circuit (46) and the multiplier (91) and is switched, prior to the start of the movement by the flow, control (21) to a value > 1 and at start of movement in the …
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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 October 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 8, 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.