JPH07117945A - Elevator safety equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] When the electromagnetic brake is stubborn, the door cannot be opened and accidents due to door-opening are prevented. [Structure] A normally closed contact 7b for detecting that the electromagnetic brake is released is provided, and the normally closed contact 7b is connected in series to a door opening command relay 9. Since it is open, the door opening command relay 9 is invalid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator safety device, and more particularly, to an elevator safety device for preventing an elevator driving accident due to a failure of an electromagnetic brake.

[0002]

2. Description of the Related Art In an elevator, a car and a counterweight are suspended via a rope, and when a motor rotates, the elevator ascends and descends via the rope. Therefore, when the vehicle is stopped, an unbalanced load with the riding car and the counterweight causes the motor to start automatically, so that the motor is equipped with an electromagnetic brake.When the vehicle is stopped, the electromagnetic brake is braked. ing. Regarding the above technique, for example, Japanese Patent Laid-Open No. 49-
No. 111347 is cited.

[0003]

By the way, since the elevator is frequently shut down, the electromagnetic brake is released.
The release is also frequently performed, which may cause a failure. In particular, the moving parts of the electromagnetic brake are so tight that the normal braking force will not be generated unless it is released normally, so the elevator stop command causes the unbalanced load when the door opens and the passengers get on and off in this state. Then there was the problem of being extremely dangerous.

In view of the above-mentioned drawbacks, the present invention is to provide an elevator safety device for preventing a driving accident due to a failure such as an obstruction of the electromagnetic brake of the elevator.

[0005]

The object of the present invention is to provide an elevator equipped with an electromagnetic brake for releasing the elevator during traveling and releasing it while the elevator is stopped, by providing a normally-closed contact for detecting that the electromagnetic brake is released. This is achieved by connecting this normally closed contact in series to the door opening command circuit of the elevator.

[0006]

When the electromagnetic brake operates normally, the electromagnetic brake is released and the normally-closed contact is closed by the elevator stop command, so that the door is normally opened. On the other hand, even if the release command is given to the electromagnetic brake,
When the normal braking force is not generated, the normally closed contact is open, so the door does not open. Therefore, it is possible to prevent an accident due to the door-opening operation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 shows the overall construction of the electromagnetic brake according to the present invention. In the figure, 1 is a drum, 2
Is a base 3 is a shoe pivotally supported by the base 2, and normally, a drum 4 and a shoe 3 are connected via an arm 5 by a spring 4.
Are compressed and generate a predetermined braking force. 6 is a plunger that attracts the arm 5 when a coil described later is excited (in the figure, the arm 1 is attracted, the drum 1 and the shoe 3 are compressed, but the shoe 3 is actually released). Be released), Shoe 3 is released. Reference numeral 7 is a switch provided at the tip of the arm 5, 7b is a normally closed contact thereof, and normally the contact 7b is closed.
Is configured to open when aspirated.

FIG. 1 is an electrical connection diagram of an elevator safety device according to the present invention. In the figure, P,
N is a DC power supply terminal, 8 is a coil of the plunger 6, 9 is a relay that gives an opening command to the elevator car door, 10a
Is a normally open contact of a relay (not shown) that is energized while the elevator is running, and 10b is a normally closed contact of the relay, and the normally open contact 10a and the coil 8 are connected in series. Reference numeral 11b is a normally-closed contact of a relay (not shown) that detects that the car is in the normal stop position, and 12b is a normally-closed contact of a relay (not shown) that detects the open end of the door, such as contacts 11b, 10b, 7b, 12b. The relay 10 is connected in series.

Next, the operation of this embodiment will be described.

Now, assume that the electromagnetic brake is in a normal state. When a running command is given, the door is closed by a door closing command circuit (not shown), the contact 10a is closed, the coil 8 is excited, the plunger 6 is attracted, the shoe 3 is opened, and the electromagnetic brake is released. Therefore, the car runs and is stopped at a predetermined floor by a driving circuit (not shown). When stopped, contact 1
1b and 10b are closed, and the electromagnetic brake is also normal, so the contact 7b is also closed, the relay 9 for door opening command is energized, the door starts to open, and the contact 12b opens at the door open end and the relay 9
Turn off.

Next, it is assumed that the car stops at a predetermined floor in the same manner as above with the contact of the electromagnetic brake being tight and the contact 7b being open. At this time, the contacts 11b, 10b, 12b are closed, but since the contact 7b is open, the relay 9 is not energized and the door is not opened. Therefore, even if the car is operated to open the door, the passenger cannot get on or off the car, so that an accident can be prevented.

[0013]

As described above, according to the present invention, the normally closed contact for detecting the release of the electromagnetic brake is provided, and the normally closed contact is connected in series to the door opening command circuit of the elevator. Since the door will not open even if the electromagnetic brake is firmly fixed, accidents due to door-opening operation can be prevented.

[Brief description of drawings]

FIG. 1 is an electrical connection diagram of an elevator safety device according to the present invention.

FIG. 2 is an overall configuration diagram of an electromagnetic brake according to the present invention.

[Explanation of symbols]

 1 Drum 3 Shoe 6 Plunger 7b Normally Closed Contact 8 Door Open Command Relay 9 Coil

Claims (1)

[Claims] 1. An elevator having an electromagnetic brake for releasing the elevator during traveling and releasing the elevator while the elevator is stopped, is provided with a normally-closed contact for detecting that the electromagnetic brake is released, and the normally-closed contact is used as the elevator door. An elevator safety device characterized by being connected in series to an open command circuit.