Belt device for driving elevator
CA 2567698 C · Owner: Nitta Corporation · Inventors: Wake, Atsuhito; Yuasa, Kazuyuki; Ishikiriyama, Yasunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A belt device for driving an elevator having an increased standstill holding capability to maintain the stopped state of a car even if oil or water is adhered between a belt and pulleys. The belt (4) is wrapped around the plurality of pulleys (1), (2), and (3) and rotated by the rotation of the pulleys (1), (2), and (3). The coefficient of friction of the contact surface of the belt (4) on at least the driving pulley (1) is set to 0.6 to 3.0 and , the contact surface is formed of a wear-resistant rubber having a hardness (IRHD) of 65 to 95 and a Taber abrasion (requirements specified in ISO547-1- 1999: wear ring: H18, load: 1 kg, speed: 1000 rpm) of 5 to 300 mm3.
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
- Filed May 26, 2005 and granted March 6, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 26, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.