ELEVATOR SYSTEM

• US 20100155182A1
• Filed: 11/20/2006
• Published: 06/24/2010
• Est. Priority Date: 11/20/2006
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Ando, Eiji, Ueda, Takaharu
• Granted Patent: US 8,177,034 B2
• Time in Patent Office: Days
• US Class Current: 187/280
• CPC Class Codes: B66B 13/02 Door or gate operation of general application E05F
• CPC Class Codes: B66B 5/0062 by devices, being operable or not, mounted on the elevator car
• CPC Class Codes: B66B 5/04 for detecting excessive speed
• CPC Class Codes: B66B 5/18 and applying frictional retarding forces
• CPC Class Codes: B66B 5/288 with maintenance features if not incorporated in the buffer B66B5/0087

Abstract

An elevator system in which a controller monitors whether or not a speed of an ascending/descending body reaches a preset overspeed. At a time of maintenance work, a stopper is interposed between a buffer and the ascending/descending body to limit a lowered position of the ascending/descending body. Stopper detection means detects installation of the stopper onto at least one of the buffer and the ascending/descending body. When the stopper is detected by the stopper detection means, the controller lowers a set value of the overspeed.

Claims

1. An elevator system comprising:

an ascending/descending body being raised and lowered in a hoistway;

a controller for monitoring whether or not a speed of the ascending/descending body reaches a preset overspeed;

a buffer provided in a lower part of the hoistway;

a stopper being interposed between the buffer and the ascending/descending body at a time of maintenance work to limit a lowered position of the ascending/descending body; and

stopper detection means for detecting installation of the stopper onto at least one of the buffer and the ascending/descending body,

wherein the controller lowers a set value of the overspeed when the stopper is detected by the stopper detection means.

3. The elevator system according to claim 1, wherein the stopper detection means is a stopper detection switch for mechanically detecting the installation of the stopper.

4. The elevator system according to claim 1,

wherein the controller includes settings of an overspeed pattern for a normal operation and an overspeed pattern for a maintenance operation, and

wherein the controller sets a current overspeed on the basis of information of a position of the car, information of a running direction of the car, information from the stopper detection means, and the overspeed pattern.

5. The elevator system according to claim 4, wherein the overspeed pattern in an area in a vicinity of a terminal landing is set to gradually decrease according to a distance to the terminal landing.

6. The elevator system according to claim 1, wherein the controller includes a device for executing a function of controlling a travel of the car and a device for executing a function of monitoring whether or not a speed of the car reaches the overspeed as independent devices.

2. An elevator system comprising:

an ascending/descending body being raised and lowered in a hoistway;

a controller for monitoring whether or not a speed of the ascending/descending body reaches a preset overspeed;

a stopper being interposed between the ascending/descending body and a ceiling of the hoistway at a time of maintenance work to limit a raised position of the ascending/descending body; and

stopper detection means for detecting installation of the stopper onto at least one of the ascending/descending body and the ceiling of the hoistway,

wherein the controller lowers a set value of the overspeed when the stopper is detected by the stopper detection means.

11. The elevator system according to claim 2, wherein the stopper detection means is a stopper detection switch for mechanically detecting the installation of the stopper.

12. The elevator system according to claim 2,

wherein the controller includes settings of an overspeed pattern for a normal operation and an overspeed pattern for a maintenance operation, and

wherein the controller sets a current overspeed on the basis of information of a position of the car, information of a running direction of the car, information from the stopper detection means, and the overspeed pattern.

13. The elevator system according to claim 12, wherein the overspeed pattern in an area in a vicinity of a terminal landing is set to gradually decrease according to a distance to the terminal landing.

14. The elevator system according to claim 2, wherein the controller includes a device for executing a function of controlling a travel of the car and a device for executing a function of monitoring whether or not a speed of the car reaches the overspeed as independent devices.

7. An elevator system comprising:

a car being raised and lowered in a hoistway; and

a controller for controlling an ascent/descent of the car in a plurality of operation modes including a normal operation mode and a maintenance operation mode in which the car is raised/lowered at a speed lower than that in the normal operation mode and for monitoring whether or not a speed of the car reaches a preset overspeed,

wherein the controller lowers a set value of the overspeed when the operation mode is switched to the maintenance operation mode.

8. An elevator system comprising:

a car having a car door and being raised and lowered in a hoistway;

a controller for monitoring whether or not a speed of the car reaches a preset overspeed;

a plurality of landing doors; and

door opening/closing detection means for detecting open/close states of the car door and the landing doors,

wherein the controller lowers a set value of the overspeed when the door opening/closing detection means detects that at least one of the car door and the landing doors is opened.

9. An elevator system comprising:

a car being raised and lowered in a hoistway;

a controller for monitoring a position of the car and for monitoring whether or not a speed of the car reaches a preset overspeed;

a plurality of landing doors; and

door opening/closing detection means for detecting open/close states of the landing doors,

wherein the controller lowers a set value of the overspeed when the door opening/closing detection means detects that the landing door at a floor other than that at which the car currently stops is opened.

10. An elevator system comprising:

a car being raised and lowered in a hoistway;

a controller for monitoring whether or not a speed of the car reaches a preset overspeed; and

means for people detection on top of the car for detecting whether or not a person is present on top of the car,

wherein the controller lowers a set value of the overspeed when the means for people detection on top of the car detects that the person is present on top of the car.