Impact protected screw lift system suitable for residences
CA 1297804 C · Owner: Bergvall, Rune · Inventors: Bergvall, Rune; Karlsson, Klas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A screw lift comprises a lift car (2) which is movably, supported on an upright fixed screw (4) and carries a nut (54) in engagement with the screw and a belt drive means for rotating the nut on the screw and thereby driving of the lift car along the screw. The nut (54) is rotatably journalled in a lubrication and bearing housing (62), which is connected with the lift car (2) and out of which it extends with a portion that widens essentially, conically and carries a belt pulley (56) with a correspondingly conically shaped hole. The belt pulley and the nut are mutually somewhat axially shiftable. A pulse transmitter (130,132) is arranged as the only position, direction and velocity …
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 March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 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.