US3750849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex counterweightless shuttle elevator system
Assignee: Westinghouse Electric Corp
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Filing: 1971-12-29
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Granted: 1973-08-07
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Expires: 1991-12-29
Abstract
Abstract Elevator cars suspended from opposite ends of a traction driven hoist cable counterbalance each other and provide ideal spacing between cars serving two terminal floors such as a main floor and a sky lobby. A leveling device on one or both cars provides for adjustment of the position of the associated car relative to the hoist cable to accommodate for cable stretch and settling of the building so that each car can be brought into exact registry with the adjacent landing. The cars can be arranged to stop at pairs of intermediate floors located equal distances from the two terminal floors and can be further arranged to distribute load in opposite directions from a third terminal located halfway between the first and second terminals. The counterbalanced cars can be combined with a second elevator system, either a conventional system or a counterbalanced system, for sky lobby operation with the counterbalanced car system providing either the shuttle service, the local service or both.
Inventors
- 👤 H Berkovitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:07
CPC Classifications
B; B66; B66B; B66B11/00; B66B11/02; B66B11/0206; B66B1/00; B66B1/34; B66B1/36; B66B1/40; B66B1/42; B66B11/0226; B66B9/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
215 words
In an elevator system a structure having first and second landings vertically displaced along a hoistway, two elevator cars, traction sheave means mounted at the top of the hoistway, a hoist cable reeved over said traction sheave means, said elevator cars being suspended from opposite ends of said hoist cable in counterbalancing relation so that when one car is adjacent one landing the other car is adjacent the other landing, drive means connected to said traction sheave means and operative to raise and lower the counterbalancing cars in opposition to each other to serve the landings, third and fourth landings located between said first and second landings with said third landing being the same distance from said first landing as the fourth landing is from said second landing, and deflecting sheave means located between said third and fourth landings for deflecting one side of said hoist cable so that the car suspended from said one side of said hoist cable recoprocates in said hoistway directly below the other car, whereby the two cars operate along a common vertical axis with said one car being adjacent the first landing when said other car is adjacent the second landing and said one car is adjacent the third landing when said other car is adjacent the fourth landing.
Claim 2
Dependent Claim
215 words
In an elevator system a structure having first and second landings vertically displaced along a hoistway, two elevator cars, traction sheave means mounted at the top of the hoistway, a hoist cable reeved over said traction sheave means, said elevator cars being suspended from opposite ends of said hoist cable in counterbalancing relation so that when one car is adjacent one landing the other car is adjacent the other landing, drive means connected to said traction sheave means and operative to raise and lower the counterbalancing cars in opposition to each other to serve the landings, third and fourth landings located between said first and second landings with said third landing being the same distance from said first landing as the fourth landing is from said second landing, and deflecting sheave means located between said third and fourth landings for deflecting one side of said hoist cable so that the car suspended from said one side of said hoist cable recoprocates in said hoistway directly below the other car, whereby the two cars operate along a common vertical axis with said one car being adjacent the first landing when said other car is adjacent the second landing and said one car is adjacent the third landing when said other car is adjacent the fourth landing.
Claim 3
Dependent Claim
211 words
In an elevator system a structure having first, second, and third landings vertically displaced in ascending order, first and second elevator cars, first and second hoistways for said first and second elevator cars, respectively, traction sheave means mounted at the top of the first hoistway, a hoist cable reeved over said traction sheave means, said elevator cars being suspended from opposite ends of said hoist cable in counterbalancing relation so that when one car is adjacent the first landing the other car is adjacent the third landing, drive means connected to said traction sheave means and operative to raise and lower the counterbalancing cars in opposition to each other to serve the landings, said first hoistway extending from said third landing to said second landing with said second hoistway being parallel to and adjacent said first hoistway and extending from substantially said second landing to said first landing, the side of said hoist cable supporting said first car being routed down said first hoistway, and including deflection sheave means above said second landing for guiding said hoist cable so that said second car is suspended in said second hoistway, whereby said first car operates between said second, and third landings while said second car operates between said second and first landings.
Claim 4
Dependent Claim
211 words
In an elevator system a structure having first, second, and third landings vertically displaced in ascending order, first and second elevator cars, first and second hoistways for said first and second elevator cars, respectively, traction sheave means mounted at the top of the first hoistway, a hoist cable reeved over said traction sheave means, said elevator cars being suspended from opposite ends of said hoist cable in counterbalancing relation so that when one car is adjacent the first landing the other car is adjacent the third landing, drive means connected to said traction sheave means and operative to raise and lower the counterbalancing cars in opposition to each other to serve the landings, said first hoistway extending from said third landing to said second landing with said second hoistway being parallel to and adjacent said first hoistway and extending from substantially said second landing to said first landing, the side of said hoist cable supporting said first car being routed down said first hoistway, and including deflection sheave means above said second landing for guiding said hoist cable so that said second car is suspended in said second hoistway, whereby said first car operates between said second, and third landings while said second car operates between said second and first landings.
Claim 5
Dependent Claim
75 words
The system of claim 2 including additional pairs of landings with one landing of each pair being located in said first hoistway substantially the same dIstance above said second landing as the other landing in the same pair is located below said second landing in the second hoistway, whereby when the first car is adjacent one landing in each pair the second car is substantially adjacent the other landing in that same pair of landings.
Claim 6
Dependent Claim
70 words
The elevator system of claim 3 including adjusting means associated with at least a first one of the elevator cars and operative to adjust the position of said first car relative to the hoist cable whereby both cars can be brought into exact registry with the adjacent landing simultaneously despite stretch of the hoist cable caused by variations in the loading of the cars and despite settling of the structure.
References Cited (Backward Citations)
US1943119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |