JPH11322214A - Safety device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure safety of an inspector by preventing occurrence of a human error such as omission of operation of an inspection switch and wearing of an safety belt in performing maintenance and inspection. SOLUTION: When an inspector gets on an elevator car, the operation mode of an elevator is placed into an operation prohibiting mode. A safety belt wearing detecting means 17 detecting the inspector wearing the safety belt is serially- connected to a mode operating means 16 placing an operation mode into an inspection mode. When both means are actuated, the operation mode is switched to the inspection mode. It is thus possible to inspect the elevator only when the safety devices are actuated simultaneously, thereby ensuring safety of the inspector on the car.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an elevator, and more particularly to a safety device for ensuring the safety of an inspector working on an elevator car.

[0002]

2. Description of the Related Art As shown in FIG. 4, a schematic structure of an elevator is such that a car 2 and a counterweight 3 are provided at both ends of a main rope 4 so as to be located in a dedicated hoistway 1 provided in a building. The main rope 4 is engaged with a sheave 5 in a machine room on the top floor of the building. Then, the sheave 5 is controlled by a motor 7 whose rotation is controlled by an elevator control device 6.
The car 2 moves up or down in accordance with the rotation direction, and the counterweight 3 moves in the direction opposite to the moving direction of the car 2. Further, a signal such as a destination floor registration operated in the car 2 is transmitted to the elevator control device 6 via the tail cord 8.

[0003] Maintenance and inspection of such elevators are performed by inspectors having specialized knowledge. That is, since the maintenance and inspection work of the elevator involves a risk that the inspector rides on the elevator car 2, first, as a preparatory work for ensuring safety, the illustration provided on the elevator car 2 is performed. The inspector operates the inspection switch on the car to send a signal to the elevator control device 6 to change the operation mode of the elevator from the normal operation speed to a low operation speed suitable for the inspection work, and to call the elevator car. Switch to "Inspection mode" in which hall calls are not accepted.

Further, since there are openings such as gaps 1a and 1b between the periphery of the elevator car 2 and the wall surface of the hoistway 1, maintenance and inspection personnel on the car 2 access these openings. In order to prevent falls, maintenance and inspection staff wear safety belts to prevent falls.

[0005]

However, the operation of the check switch and the confirmation of the wearing of the safety belt are as follows.
The maintenance / inspection personnel must perform the maintenance / inspection work in the event that the operator does not operate the switch or wears the safety belt in the event that the elevator continues to operate in the normal operation mode. In the worst case, maintenance and inspection personnel may fall from the elevator car to the opening,
There was a risk of accidents such as narrowing. The present invention has been made to solve such a problem.

[0006]

According to a first aspect of the present invention, there is provided a detecting means for detecting that a person has entered a car of an elevator, and an operation mode of the elevator is prohibited in response to a detection signal from the detecting means. Mode setting means for setting a mode.

According to the first aspect, when a person gets on the car of the elevator, the operation mode of the elevator is automatically set to the operation prohibition mode, so that the safety of the person getting on the car is improved. Secured.

According to a second aspect of the present invention, there is provided a boarding detecting means for detecting that an inspector has got on a car of an elevator, and an elevator for fixing a safety zone of the inspector who got on the car of the elevator. A safety band engaging means provided on the car, a safety band use detecting means provided on the safety band engaging means, and the safety band use detecting means are connected in series to operate the elevator operation mode to the inspection mode. Mode operation means provided on the elevator car, and mode switching means for switching the operation mode of the elevator from the operation prohibition mode to the inspection mode when both the mode operation means and the safety zone use detection means operate. It is provided with.

According to the second aspect of the present invention, the operation mode of the elevator is switched from the operation inhibition mode to the inspection mode only when it is detected that the safety belt is used, so that the operator can get on the elevator car. Inspection personnel safety is ensured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an elevator safety device according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a circuit diagram showing an embodiment of an elevator safety device according to the present invention. When the inspector performs maintenance and inspection of the elevator on the elevator car 2, the detection switch 1 detects that the inspector has entered the elevator car 2 at a position where the inspector gets on the elevator car 2.
1 is provided. The detection switch 11 is, for example, a piezoelectric mat laid on a boarding position, and is formed so that when an inspector gets on the car 2, it is activated by its weight to close the circuit. The coil of the first relay 12 is connected in series with the detection switch 11.

The first relay 12 has two normally open contacts 12-1 and 12-2. The contact 12-1 of the first relay 12 is connected to an alarm device 13 such as a bell and a second relay 14 described later.
Are connected in series to the normally closed contact 14-1. The contact 12-2 of the first relay 12 is provided with an operation-prohibited-mode signal generator 15 for setting the operation mode of the elevator to the operation-prohibited mode and the second relay 14
Is connected in series to a normally closed contact 14-2.

The second relay 14 comprises two normally-closed contacts 14-1 and 14-2 and one normally-closed contact 14-3. Are connected in series to a car inspection switch 16 provided on the car 2 and a safety zone use detection switch 17 also provided on the car 2 of the elevator. The normally open contact 14-3 of the second relay 14 is connected in series to an inspection mode signal generator 18 for switching the operation mode to the inspection mode. The signals from the operation prohibition mode signal generator 15 and the inspection mode signal generator 18 are supplied to the elevator controller 6.

Next, the safety zone use detection switch 17 will be described with reference to FIG. When the inspector performs maintenance and inspection work on the elevator car 2, the safety belt is to be used to prevent falling, so the inspector is attached to the body on the elevator car 2. A safety belt holding device 21 is provided for fixing one end of the safety belt to the elevator car 2 side. The safety belt holding device 21 is provided with a safety belt detection switch 17. FIG. 2 shows a part of the safety belt holding device 21. The safety belt holding device 21 is provided with a lever 23 that rotates around a support post 22. One end of the lever 23 is The end of the lever 23 extends long from the support column 22 to reach the safety band mounting portion 24, and the other end of the lever 23 is short, and the safety band detection switch 17 faces the front end. A spring 25 for applying a restoring force is interposed on the long side of the lever 23.

The safety belt holding device 21 constructed as described above
In the state where the safety belt is not attached to the safety belt attaching portion 24, the elongated arm of the lever 23 is connected to the spring 2.
5, the short end of the lever 23 does not hit the safety band detection switch 17, and the safety band detection switch 17 is OFF. On the other hand, when the inspector wears the hook at one end of the safety belt worn on the body by the inspector, the long extended arm of the lever 23 is lowered to the lower side in the figure due to the weight of the hook of the safety belt. The short end of the lever 23 pivots upward about the support post 22 against the spring 25, so that the lever 23
Safety belt detection switch 1 facing the tip of the short side
7 is turned ON.

The operation of the present invention will be described with reference to the flowchart shown in FIG.

When the inspector gets into the riding position on the elevator car 2 for maintenance / inspection of the elevator, the detection switch 11 made of a piezoelectric mat or the like placed on the riding position operates (step 1) to be turned on. Becomes Therefore, the first relay 12 operates, sends a signal from the operation inhibition mode signal generator 15 to the elevator control device 6, sets the elevator to the operation inhibition mode, and simultaneously activates the alarm device 13, An alarm sound is generated by a bell or a buzzer (step 2).

Next, when the checker fastens the hook of the safety belt attached to his / her body to the safety belt holding device 21 provided on the elevator car 2, the safety belt detection switch 1
7 operates (step 3). Further, the inspector turns on the car inspection switch 16. It is determined in step 4 whether or not the on-car inspection switch 16 is turned on. If the on-car inspection switch 16 is on, an AND operation between the on-car inspection switch 16 and the safety zone detection switch 17 is established. The second relay 14 operates to send a signal from the inspection mode signal generator 18 to the elevator controller 6 to set the elevator to the inspection mode (step 5). At the same time, the supply of the signal from the operation prohibition mode signal generator 15 to the elevator control device 6 is stopped to release the operation prohibition mode, and the operation of the alarm device 13 is stopped (step 6).

As described above, when it is detected that the inspector has stepped on the car 2 of the elevator, an alarm is automatically issued, and the inspector wears the safety belt and inspects the car inspection switch 16. To set the mode,
Put the elevator in the prohibition mode. Unless the inspector fastens the hook of the safety belt to the safety belt holding device 21 provided on the elevator car 2 and turns on the car inspection switch 16, the elevator continues in the operation prohibition mode, The mode is switched to the inspection mode only when both are set correctly. Therefore, the inspector can safely perform maintenance and inspection work on the elevator car 2.

[0020]

As described above in detail, according to the present invention, during maintenance / inspection work on an elevator car, it is automatically detected that an inspector has entered the elevator car, and a safety device is provided. To prevent the human error by operating the on-car inspection switch to the inspection mode, issuing an alarm until the hook of the safety belt is attached to the safety belt holding device 21, and setting the elevator to the operation prohibition mode. In addition, the maintenance and inspection work on the elevator car can be performed safely, so that a work accident such as a fall accident can be prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of an elevator safety device according to the present invention.

FIG. 2 is a configuration diagram showing one embodiment of a safety belt holding device used in the present invention.

FIG. 3 is a flowchart shown to explain an operation of the present invention.

FIG. 4 is a configuration diagram shown to explain a schematic configuration of an elevator.

[Explanation of symbols]

 2 Elevator car 6 Elevator control device 11 Detection switch 13 Alarm device 15 Signal generation device for operation inhibition mode 16 Inspection switch on car 17 Safety zone use detection switch 18 Signal generation device for inspection mode

Claims (4)

[Claims] A detecting means for detecting that a person has entered a car of an elevator; and a mode setting means for receiving a detection signal from the detecting means and setting an operation mode of the elevator to an operation prohibition mode. An elevator safety device characterized by: 2. A detecting means for detecting that a person has entered a car of an elevator, a mode setting means for receiving a detection signal from the detecting means and setting an operation mode of the elevator to an operation prohibition mode; An elevator safety device comprising: an alarm unit that receives a detection signal from the detection unit and issues an alarm. 3. A detection means for detecting that an inspector has entered the car of the elevator, and on the elevator car for fixing a safety zone of the inspector who has entered the elevator car. A safety band engaging means provided, a safety band use detecting means provided on the safety band engaging means, and a ride of an elevator which is connected in series to the safety band use detecting means and operates the operation mode of the elevator to the inspection mode. Mode operating means provided on the car, and mode switching means for switching the operating mode of the elevator from the operation prohibition mode to the inspection mode when both the mode operating means and the safety zone use detecting means operate. A safety device for an elevator. 4. An on-board detection means for detecting that an inspector has entered the elevator car, and an elevator for stopping the safety belt of the inspector who has entered the elevator car. A safety band engaging means provided, a safety band use detecting means provided on the safety band engaging means, and a ride of an elevator which is connected in series to the safety band use detecting means and operates the operation mode of the elevator to the inspection mode. A mode operation means provided on the car, a mode switching means for switching the operation mode of the elevator from the operation prohibition mode to the inspection mode when both the mode operation means and the safety zone use detection means operate, and the detection means A warning signal is issued in response to the detection signal, and when both the mode operation means and the safety belt use detection means operate, the warning is issued. A safety device for an elevator, comprising: alarm means for canceling.