US 7,377,363 B2 | ||
Elevator with variable drag for car and counterweight | ||
Michael P. Flynn, Avon, Conn. (US); and Harold Terry, Avon, Conn. (US) | ||
Assigned to Otis Elevator Company, Farmington, Conn. (US) | ||
Appl. No. 10/544,141 PCT Filed Feb. 24, 2003, PCT No. PCT/US03/05700 § 371(c)(1), (2), (4) Date Jul. 28, 2005, PCT Pub. No. WO2004/076323, PCT Pub. Date Sep. 10, 2004. |
||
Prior Publication US 2006/0175142 A1, Aug. 10, 2006 | ||
Int. Cl. B66B 1/34 (2006.01) |
U.S. Cl. 187—284 [187/292; 187/293; 318/77; 318/626; 318/467] | 12 Claims |
8. An elevator system comprising:
an elevator car;
a counterweight;
a rope connecting said elevator car and said counterweight;
a drag element associated with each of said car and said counterweight; a control controlling the amount of drag between said
car and said counterweight through said drag element to control movement of said car and said counterweight under at least
some conditions;
wherein said control controls said drag elements based upon the vertical position of said car and said counterweight; and
wherein said control controls said drag elements to ensure that the vertically lower of said car and said counterweight is
provided with a lower drag than the vertically higher of said car and counterweight.
|