Claims
- 1. An elevator system comprising:a vertical hoistway; an elevator car, disposed within said hoistway, including first and second spaced apart sheaves having parallel axes or rotation; and a first and second flat rope, each flat rope extending vertically in the hoistway through a range of travel of said car, each flat rope secured at a vertically upward end thereof wherein said first flat rope passes laterally under said first sheave, vertically upward between said first and second sheaves, and laterally over said second sheave, wherein said second flat rope passes laterally under said second sheave, vertically between said second and first sheaves, and laterally over said first sheave; and means for driving one of said first and second sheave.
- 2. An elevator system according to claim 1, whereinsaid flat ropes are disposed at the periphery of said hoistway and outside the volume traversed by said car.
- 3. An elevator system according to claim 1, whereinthe lower vertical end of each first and second flat rope is secured to tensioning means for tensioning said corresponding flat rope.
- 4. An elevator system according to claim 3, whereinsaid tensioning means comprise a suspended weight.
- 5. An elevator system according to claim 3, whereinsaid tensioning means comprise a spring.
- 6. An elevator system according to claim 3, whereinsaid tensioning means are adapted to impart variable tensile forces on said flat ropes.
- 7. An elevator system according to claim 1, further comprisinga pair of counterweights: a pair of suspension ropes, each secured at one end to said elevator car and each secured at the other end to one of said pair of counterweights; and a pair of idler pulleys, each corresponding to one of said suspension ropes and suspending said elevator and one of said respective counterweights.
- 8. An elevator system according to claim 7, whereineach said suspension rope is a round rope.
Parent Case Info
This application is a continuation in part of patent application Ser. No. 08/825,282 filed Mar. 27, 1997, now U.S. Pat. No. 5,931,265.
US Referenced Citations (21)
Foreign Referenced Citations (21)
Number |
Date |
Country |
1 032 496 |
Jun 1958 |
AU |
2333120 |
Jan 1975 |
DE |
296 15 921 U 1 |
Apr 1997 |
DE |
19632850 |
Feb 1998 |
DE |
0565516 |
Oct 1993 |
EP |
0 606 875 A1 |
Jan 1994 |
EP |
0 779 233 A2 |
Jun 1994 |
EP |
0 784 030 A2 |
Jun 1994 |
EP |
0 688 735 A2 |
Jun 1995 |
EP |
0 710 618 A2 |
Oct 1995 |
EP |
0 749 930 A2 |
Jun 1996 |
EP |
0 749 931 A2 |
Jun 1996 |
EP |
0867395 |
Sep 1998 |
EP |
2 640 604 |
Dec 1988 |
FR |
1 401 197 |
Jun 1972 |
GB |
2 138 397 |
Nov 1985 |
GB |
2 2-1 657 |
Aug 1990 |
GB |
49-20811 |
May 1974 |
JP |
1-242386 |
Sep 1989 |
JP |
505764 |
Apr 1976 |
SU |
WO 9609978 |
Apr 1996 |
WO |
Non-Patent Literature Citations (5)
Entry |
“Elevator Mechanical Design, Principles and Concepts”, by Lubomir Janovsky, Ellis Horwood Limited (1987). |
PCT/FI97/00823, Dec. 19, 1997, Aulanko et al. |
PCT/FI97/00824, Dec. 19, 1997, Aulanko et al. |
“Hannover Fair: Another new idea from ContiTech—Lifting belts for elevators”, ContiTech initiativ Jan. 1998 (Hannover Fair '98). |
PCT Search Report for Serial No. PCT/US99/03649 dated Aug. 24, 1999. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/825282 |
Mar 1997 |
US |
Child |
09/163780 |
|
US |