JPH0121076B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator car door opening/closing device.

Generally, car doors are not provided with locking devices. As a result, accidents have occurred in which the door of a moving car is forcefully opened by children in apartment complexes, or by drunken people in multi-tenant buildings, causing the car to stop abruptly in the middle of the floor.

Normally, between the landings, there is a gap of 15cm to 20cm between the front of the car and the wall of the hoistway, so if the car door opens, there is a risk that children or drunk passengers may fall through the gap into the hoistway. There is. However, if the opening resistance is extremely high due to the mechanical structure, or the door cannot be opened without special means, power outages and
This poses a major hindrance to the emergency evacuation of passengers, etc. from a car that has been stopped in an emergency due to a fire, etc.

FIG. 1 is a schematic diagram of the elevator car door opening/closing device as seen from the hoistway side. The car door 3 is now fully closed, and when the car door 3 is fully closed, the gate switch 11 is closed, the close limit switch of the door opening/closing mechanism control switch 12 is opened, and the door motor 4 stops rotating in the door closing direction. It shows the ivy condition.

Although not shown in the diagram, when the doors on all floors of the landing are closed and automatically locked, all the switches connected in series on all floors close, and the car starts traveling toward its destination floor. . When a passenger in the car, out of curiosity or as a prank, puts his finger in the gap in the car door 3 and applies force to the left and right, the car door begins to open.
In this case, the switch of the door opening/closing mechanism control switch 12 is open, and the rotational force of the door motor 4 in the closing direction is not functioning as a door opening resistance due to arm strength, so in this state, if an external force is applied all at once, , the door opening force is car door 3 → main lever 10 →
The door motor 4 is reversely driven via the connecting rod 9 → chain pulley 8 → chain 7 → pulley 5 → belt 2, but when the door opening/closing mechanism control switch 12 is closed, a rotational force in the closing direction is generated in the door motor 4. Faster, gate switch 1
1 becomes open, and as a result, the movement of the car is stopped.

An object of the present invention is to provide an elevator car door opening/closing device that prevents the car door from being opened artificially when the car is running normally, and allows the car door to be opened artificially when the car is stopped. There is a particular thing.

The above object is provided with an opening/closing drag applying means having an electromagnet that is excited only when the car is running, and a magnetic body that is attracted to this electromagnet when energized. This can be achieved by having one of them attached to a movable location when the car door is opened and closed, and the other to a stationary location.

With the above configuration, during normal driving, the electromagnet is energized and magnetized, and the magnetic body is maintained in a state where it is attracted, so the magnetic body will not move unless a force greater than the attraction force of the electromagnet is applied. , the car door will not be opened artificially. In addition, in the event of a breakdown, power outage, disaster, etc., or if the car stops normally, the electricity to the electromagnet will be cut off and it will become de-energized, so there will be no suction force, and in the event of a breakdown, power outage, disaster, etc., the car door will be opened artificially. can do.

An embodiment of the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 2 and 3.

In FIG. 2, the car door is decelerated by the door motor 4, belt 2, pulley 5, sprocket 6, chain 7, and chain pulley 8, and rotates counterclockwise to open the car door via the connecting rod 9. It is driven in the closing direction by the main lever 10.

In FIG. 3, the crank 14, which has been decelerated by the door motor 4 and the worm reducer 13, rotates counterclockwise to drive the car door in the closing direction by the main lever 10 via the connecting rod 9. . When the car door is in the fully closed position, Fig. 2 shows the iron piece 15 attached around the chain pulley 8 (the part that moves when the car door is opened and closed), and Fig. 3 shows the iron piece 15 attached to the tip of the crank 14 (the part that moves when the car door is opened and closed). An electromagnet 17 is attached by a bracket 16 to a door opening/closing mechanism mounting base (stationary location), which is a fixed body, so as to be in contact with an iron piece 15 attached to a fixed location. This electromagnet 17 is energized while the car is running, and is deenergized just before the car decelerates and stops at the destination floor and the door opening/closing mechanism opens the door electrically.

In this example, due to the electromagnet having an attractive force of approximately 5 kg, the door opening resistance from inside the car is approximately 70 kg.
This is amplified and it becomes almost possible to open the door with physical strength. In addition, when the car is stopped, the electromagnet is deenergized, so the door opening resistance is approximately 25 kg, making it possible to open the door with arm strength, which is extremely effective in preventing the car door from being opened due to mischief, without hindering the emergency evacuation of passengers. was gotten.

As described above, according to the present invention, during normal driving,
Electricity is applied to the electromagnet, which excites the electromagnet and maintains the state in which it attracts the magnetic material, so the magnetic material does not move unless a force greater than the attraction force of the electromagnet is applied, and the car door will not be opened artificially. . In addition, in the event of a breakdown, power outage, disaster, etc., or if the cart stops operating normally,
Since the power to the electromagnet is cut off and it becomes de-energized, the attraction force disappears, and the car door can be opened artificially in the event of a breakdown, power outage, disaster, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an elevator car door opening/closing device as seen from the hoistway, and FIGS. 2 and 3 are front views showing one embodiment of the car door opening/closing device according to the present invention. 3...car door, 15...iron piece, 17...electromagnet.

Claims (1)

[Claims] 1. In an elevator car door opening/closing device in which a car has a car door and the car door is opened and closed by a motor, an electromagnet is energized only when the car is running;
The electromagnet is equipped with a door-opening resistance imparting means having a magnetic body that is attracted when energized, and the electromagnet and the magnetic body of the door-opening drag imparting means are in close contact with each other when the door is closed, and one of them is movable when the car door is opened and closed. An elevator car door opening/closing device characterized in that the other is attached to a stationary location, and the other is attached to a stationary location.