JPS5819588B2 - Elevator door opening prevention device - Google Patents

Description

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

Elevator hoistways have parts that protrude from the walls, such as sills and banger cases, so
The wall surface and the protruding portion form an uneven surface.

Therefore, when the car stops in a position facing a recess in the hoistway due to a power outage, malfunction, or activation of a safety device due to the impact of a child accidentally jumping, the car door is opened and the recess is opened. Passengers attempting to escape to the elevator sometimes got caught between the car and the wall, or fell into the hoistway.

The present invention has been made in view of the above points, and when a car abnormally stops in a hoistway due to a power outage or breakdown,
The purpose of this is to prevent the car door from opening from inside the car, thereby preventing the above-mentioned accidents from occurring.

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

FIG. 1 is an overall view showing the door opening prevention device installed on the car, FIG. 2 is a detailed view of section A in FIG. 1, and FIG. 3 is an explanatory view of the operation of FIG. 2.

In the figure, 1 is an elevator car, 2 is a car door, 3 is a car frame, 4 is a mounting member for the door motor 5, 6 is a belt pulley attached to the shaft of the door motor 5, and 7 is a bolt 12 attached to the belt pulley 6. The friction plate 8 is a suppression plate having a groove 8a on its outer periphery that engages with the tip of the locking piece 15, and is rotated to a position coaxial with the belt pulley 6 and facing the friction plate 7. It is provided movably in the dynamic and axial directions.

9 is a spring that constantly presses the suppression plate 8 in the direction of the friction plate 7, 10 is a nut, 11 is a rod that passes through the spring 9 and the suppression plate 8 and is fastened and fixed to the friction plate 7, 13 is a washer, and 14 is a nut. Electromagnet 17 is a pin that rotatably fastens the locking piece 15 to the mounting bracket 16.

In addition, since one end of the locking piece 15 (right side in FIG. 3) is heavier than the other end (left side), the locking piece 15 is constantly receiving rotational force in the clockwise direction about the pin 17. However, in this implementation, a spring 18 is provided as shown in the figure to make the above operation more reliable.

FIG. 4 shows an embodiment of a circuit for controlling the coil of the electromagnet 14.

2), ←) are the normal power supply busbars, 19 is the normally closed contact of the abnormality detection relay that opens when the abnormality detection relay (not shown) operates, and 20 is the energizing coil of the electromagnet 14. This constitutes a retention control device that controls the engagement between the locking piece 15 and the structure 8a of the pressing plate 8.

Next, the operation of this embodiment will be explained.

During normal operation, the contact 19 is closed, so the electromagnet 14 is excited.

Therefore, the locking piece 15 is attracted to the electromagnet 14 and
The door motor 5 is in a state where it can freely rotate.

When an abnormality such as a power outage or failure occurs, the coil 20 is deenergized.

Therefore, the locking piece 15 rotates clockwise around the pin 17, and its tip engages with the groove 8a of the suppression plate 8, thereby preventing rotation of the suppression plate 8 in the door opening direction.

- Since the suppression plate 8 is pressed against the friction plate 7 by the spring 9, the frictional force between them also prevents the rotation of the door motor, thereby preventing the car door from opening.

Furthermore, since the magnitude of the frictional force can be changed by adjusting the pressure of the spring 9 with the nut 10, the force required to open the car door against the frictional force can be set arbitrarily.

Therefore, the door cannot be opened with the weak force of a child, but can be opened with the strong force of an adult performing rescue work.

Next, another embodiment of the present invention will be described with reference to FIG.

In the figure, 19a is the normally open contact of the abnormality detection relay, and 21 is the contact that is closed when the car is stopped within a certain distance from the floor level, that is, within the range where passengers in the car can safely escape to the floor. The door open section detection contact 22 is a battery.

In the event of an abnormality, when the car stops at a position more than a predetermined distance from the floor level, the contact 21 is open, so the electromagnet 14 is demagnetized, and when the car stops within a predetermined distance I7, it is energized. Ru.

Therefore, when the car abnormally stops within a predetermined distance from the floor level, passengers can safely escape from the car to the floor using their own blades.

As explained above, according to the present invention, in the event of an abnormality such as a power outage or breakdown, when the car stops at a position more than a predetermined distance from the floor level, a safe system that can prevent the car door from opening is provided. A door opening prevention device can be provided.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a second embodiment of the present invention. Figure 2 is a detailed view of section A in Figure 1. FIG. 3 is an explanatory diagram of the operation of FIG. 2. FIG. 4 shows an embodiment of a circuit for controlling the electromagnet energizing coil 20. FIG. 5 shows another embodiment of the present invention and is a diagram corresponding to FIG. 4. 5...Door motor, 6...Belt pulley, 7...Friction plate, 8...Press plate,
10... Nut, 918... Spring, 11... Rod, 12... Bolt, 13... Washer, 14...・・Electromagnet, 15・・Latching piece, 16・・Mounting bracket, 17・・・Pin, 19・−・・・・Abnormality detection relay normally closed contact, 19a・..... Abnormality detection relay normally open contact, 20 ..... Electromagnet energizing coil, 2
1...Door open section detection contact, 22...Battery.

Claims (1)

[Scope of Claims] 1. A friction plate attached to a belt pulley attached to a door motor shaft, and provided rotatably and axially movably on the same axis as the belt pulley and at a position facing the friction plate. a pressing plate, an elastic body that constantly presses the pressing plate against the friction plate, a locking piece that prevents rotation of the suppression plate by engaging with the pressing plate, and a connection between the locking piece and the suppression plate. An elevator door opening prevention device characterized by comprising an engagement control device for controlling. 2. The elevator door opening prevention device according to claim 1, wherein the engagement control device is a device operated by an abnormality detection device that detects an abnormality such as a power outage or a failure. 3. The engagement control device is a device that is activated by a device that detects that the elevator car has stopped at a distance of P51 or more from the floor level when an abnormality detection device that detects an abnormality such as a power outage or breakdown is activated. An elevator door opening prevention device according to claim 1, characterized in that: