ELEVATOR OVERRUN SYSTEMS

• US 20180327222A1
• Filed: 05/01/2018
• Published: 11/15/2018
• Est. Priority Date: 05/12/2017
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Rocher, Jean-Emile, Sirigu, Gerard, Bongibault, Jean Marie, Trouvain, Guillaume, Caze, Arnaud, Fournier, Guilhem
• Granted Patent: US 11,078,043 B2
• Time in Patent Office: Days
• CPC Class Codes: B66B 1/28 electrical detecting excessive speed B66B5/04 ; control of electrical motor H02P
• CPC Class Codes: B66B 5/005 Safety of maintenance personnel
• CPC Class Codes: B66B 5/0056 by preventing crushing
• CPC Class Codes: B66B 5/0087 Devices facilitating maintenance, repair or inspection tasks devices incorporated in the buffer B66B5/288; railings on top of the car B66B11/0226
• CPC Class Codes: B66B 5/282 Structure thereof
• CPC Class Codes: B66B 9/00 Kinds or types of lifts in, or associated with, buildings or other structures characterised by control systems B66B1/00; apparatus for raising or lowering persons on stages of theatres A63J5/12

Abstract

Elevator overrun systems having a first body arranged to be fixedly mounted to a portion of an elevator system or elevator shaft, a second body positioned within the first body and moveable from a deployed state to a retracted state relative to the first body, and a limit switch located at a distal end of the second body, the limit switch configured to interact with a component of an elevator system to prevent movement of an elevator car.

Claims

1. An elevator overrun system comprising:

a first body arranged to be fixedly mounted to a portion of an elevator system or elevator shaft;

a second body positioned within the first body and moveable from a deployed state to a retracted state relative to the first body; and

a limit switch located at a distal end of the second body, the limit switch configured to interact with a component of an elevator system to prevent movement of an elevator car.

2. The elevator overrun system of claim 1, further comprising at least one mounting bracket fixedly connected to the first body, the at least one mounting bracket arranged to mount the first body within the elevator shaft.

3. The elevator overrun system of claim 1, further comprising:

a lower contact mounted to the first body at a first location;

an upper contact mounted to the first body at a second location; and

a second body contact mounted to the second body, wherein when the second body contact is in contact with the lower contact the deployed state is indicated and when the second body contact is in contact with the upper contact the retracted state is indicated.

4. The elevator overrun system of claim 1, further comprising a securing element arranged to secure the second body to the first body in at least the deployed state.

5. The elevator overrun system of claim 4, wherein the securing element is one of attached to the first body or attached to the second body.

6. An elevator system comprising:

a first body arranged to be fixedly mounted to a portion of the elevator system or an elevator shaft of the elevator system;

a second body positioned within the first body and moveable from a deployed state to a retracted state relative to the first body; and

a limit switch located at a distal end of the second body, the limit switch configured to interact with a component of an elevator system to prevent movement of an elevator car.

7. The elevator system of claim 6, wherein the elevator system wherein the

elevator shaft has a pit and a top;

the elevator system comprising;

a guide rail extending from the pit to the top of the elevator shaft; and

an elevator car moveable along the guide rail,

wherein the first body is fixedly mounted to the guide rail by the at least one mounting bracket and the elevator overrun system is positioned at the top of the elevator shaft.

8. The elevator system of claim 7, further comprising a car switch mounted to an exterior of the elevator car, wherein when the car switch interacts with the limit switch, the elevator car is prevented from moving along the guide rail.

9. The elevator system of claim 7, wherein the elevator car is moveable to a first level in a normal mode of operation, a second level that is higher within the elevator shaft than the first level in a maintenance mode of operation, and a third level that is higher within the elevator shaft than the second level in a maintenance mode of operation.

10. The elevator system of claim 9, wherein the elevator car is prevented from moving to the third level when the elevator overrun system is in the deployed state.

11. The elevator system of claim 7, further comprising a safety chain arranged to prevent movement of the elevator car within the elevator shaft when the safety chain is operated.

12. The elevator system of claim 7, further comprising a counterweight buffer located in the pit of the elevator shaft, wherein when the elevator overrun system is in the retracted state the counterweight buffer is compressed.

13. A method of operating an elevator system having an elevator overrun system including a first body arranged to be fixedly mounted to a portion of an elevator system or elevator shaft, a second body positioned within the first body and moveable from a deployed state to a retracted state relative to the first body, and a limit switch located at a distal end of the second body, the limit switch configured to interact with a component of an elevator system to prevent movement of an elevator car, the method comprising:

moving an elevator car within the elevator shaft to a first level;

operating the elevator overrun system from the deployed state to the retracted state; and

moving the elevator car to a third level that is higher in the elevator shaft than the first level.

14. The method of claim 13, further comprising moving the elevator car to a second level located between the first level and the third level prior to operating the elevator overrun system.