JPS6016610Y2 - Elevator safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an elevator, and relates to an elevator safety device that detects bending of a guide rail by the inertial force of a car and a counterweight during an earthquake.

Generally, an elevator car and a counterweight are each guided in the vertical direction by two guide rails.

In this elevator, the rails may bend due to the inertial force of the car and counterweight during an earthquake, and the car and counterweight may come off the rails, so for the safety of passengers, it is necessary to stop the elevator promptly in the event of an earthquake.

Conventionally, as a solution to this problem, an earthquake seismic sensor is installed in a building to stop the elevator if an earthquake of a certain magnitude or more occurs, or to detect when the car and counterweight have come off the guide rail, and to send a detection signal. Some elevators may be stopped due to

However, in the former case, depending on the installation location of the seismic sensor, the car and counterweight may come off the rail before the seismic sensor starts operating, and in the latter case, the car and counterweight may come off the rail after coming off the guide rail. Therefore, it can be very dangerous if the driving speed is high.

Another idea is to electrically sense the relative displacement of the car or counterweight with respect to the rail, and stop the elevator when this relative displacement exceeds a certain value. A dead zone corresponding to the allowable runout is required between the car or the counterweight, which poses a problem in terms of accuracy.

The purpose of the present invention is to provide a system that directly detects bending or twisting of the rail itself, stops the elevator before the guide comes off the rail, and prevents collision between the car and the counterweight.

Other objects of the present invention will become apparent in the following description of an embodiment of the present invention.

In FIG. 1, a counterweight 2 and a car 4 are driven by a sheep 6 and a pulley 8 via a rope 10.

The counterweight 2 is a fixing bracket 12 fixed to the building.
The guide element 18 runs on the rails 14 and 16 supported by the rails 14 and 16.

Similarly for the car 4, guides run on the rails.

Therefore, the following explanation will be made on the counterweight side.

The brackets 12 are provided at a constant pitch in the rail direction.

Therefore, near the center between pitches, the rail is most susceptible to bending deformation in the direction of arrow 20.

FIG. 2 shows a view taken along line I--■ in FIG. 1.

Now, as shown in FIGS. 3 and 4, brackets 22 and 24 are attached to the back of each rail 14 and 15 between the upper and lower brackets 12.
．． A connecting rod 26 is provided between the rails 24 with one end fixed to the bracket 22 and the other end connected to the bracket 24 so as to be freely movable, and the free end of the connecting rod contacts the bracket 24 to prevent bending between the rails. A detector 28 for detection is provided.

In such a structure, when the rails are spread or twisted due to the inertial force of the counterweight, the free end of the connecting rod 26 moves and activates a switch in the bend detector 28.

This allows the elevator to be stopped before the guide 18 comes off the rail.

Generally, a plurality of bend detectors 28 are provided, and as shown in FIG. 5, a switch 28S of the bend detector 28 constitutes a circuit that turns off the power to the elevator operation/stop circuit 30.

That is, during normal operation, the relay RY is energized by the reset switch R3, which is a push button, and is self-held by the contact RYl.

As a result, the contact RY2 of the relay RY is closed, thereby energizing the elevator operation/stop circuit 30, allowing normal operation.

Now, once the switch 28S of the bending detector 28 is closed due to an earthquake, the relay RY is demagnetized and the operation/stop circuit 3 is turned off.
0 and stops the elevator to prevent accidents.

Although the bending detector 28 has been described in the form of a switch, it may also be configured with a circuit breaker that interrupts the electric circuit when the rail expands or twists.

The above is an explanation of one embodiment of the present invention. According to this embodiment, since the elevator can be stopped when the rail is bent, an accident in which the guide element comes off from the rail can be prevented, and the balance weight of the car and the counterweight can be prevented. Serious accidents such as collisions can be prevented.

Furthermore, since the bending of the rail is detected as bending, twisting and spreading between two rails, more reliable detection can be performed than in the case where only the bending of one rail is detected.

That is, in the case of an elevator, a guide fits into two rails, and when both rails bend in the same direction, the guide does not come off.

The guide comes off when the two rails widen the gap or twist.

Therefore, if the bending of only one rail is detected, there is a possibility that the elevator will malfunction, stopping the elevator even though the bending does not actually occur. Well, there's no danger of that.

In addition, since the connecting rod 26 and the detector 27 are provided on the bracket 22.24 fixed to the back side of the rail, displacement due to twisting of the rail can be magnified and transmitted to the detector 28, and the rail spacing can be reduced. Even if the rail does not change but only twists, it can be detected and the operation of the elevator can be stopped immediately, resulting in extremely high safety.

Although the above embodiments have been described with respect to a rope-type elevator, similar safety measures can be taken for a hydraulic elevator driven by a jack.

According to the present invention, the connecting body and detector for detecting rail bending and twisting are installed between brackets attached to opposing rails, so bending and twisting of the rails can be directly detected and elevator operation can be stopped. Therefore, a safety device with extremely high safety can be obtained.

[Brief explanation of drawings]

Fig. 1 is a structural diagram of the elevator, Fig. 2 is a view taken along the line I-I in Fig. 1 showing the rail section, Figs. FIG. 5 is a partial diagram of a control circuit with a detection switch.

Claims (1)

[Scope of utility model registration request] In an elevator in which two rails are attached to a building via fixing brackets so as to face each other, and a car or a counterweight is moved up and down via a guide that engages with these two rails, the above-mentioned relative A pair of detection brackets other than the fixing brackets are attached to the opposing rails, and one end of the connecting body is connected to one of the opposing detection brackets, and the other end of the connecting body is connected to one of the opposing brackets. A safety device for an elevator, characterized in that the other bracket is provided with a detector that is opposed to the other bracket and detects movement of the other end of the connecting body.