WO2001058796A1

WO2001058796A1 - Safety device for work on elevator cage

Info

Publication number: WO2001058796A1
Application number: PCT/JP2000/000717
Authority: WO
Inventors: Toshiaki Ishii; Kazumasa Ito; Makoto Tomidokoro
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2000-02-09
Filing date: 2000-02-09
Publication date: 2001-08-16
Also published as: EP1167268A4; JP4397559B2; DE60038579T2; NO20014318L; DE60024603T2; EP1167268A1; NO20014318D0; DE60024603D1; DE60038579D1; EP1524232B1; EP1524232A3; EP1524232A2; EP1167268B1

Abstract

A safety device (31) for a work on an elevator cage which has a detection plate (33) which can be displaced upward by a pressure applied from below and is hung in an elevator shaft (1). The detection plate (33) is placed between a drive device (21) and a cage (5) so as to allow the maintenance work of the drive device (21) above the cage. A buffer (35) is attached to the lower surface of the detection plate (33). The upward displacement of the detection plate (33) is detected by a plurality of detection switches (34). If at least one of the detection switches (34) is operated by the upward displacement of the detection plate (33), the ascent of the cage is stopped by a stop circuit (40).

Description

Mesehyo

The present invention provides an elevator car, which is provided in an elevator in which a drive device is provided in an upper part of a hoistway, and prevents a worker from colliding with the drive device when working on a car. The present invention relates to a work safety device.

FIG. 13 is a side view showing a conventional elevator similar to that shown in, for example, European Patent Application Publication EP 0 926 093 A, and FIG. FIG. In the figure, a driving device 2 having a sheep 3 is fixed to an upper part in a hoistway 1. The middle part of the main rope 4 is wound around the sheave 3. A basket 5 and a counterweight 6 are suspended from the main rope 4. At the lower part of the car 5, a pair of car suspension wheels 7 around which the main rope 4 is wound are provided. Above the counterweight 6 is provided a weight suspension wheel 8 around which the main rope 4 is wound. The car 5 is provided with a car door 9. On the landing side, a landing door 10 is provided opposite the car door 9.

At the upper part of the car 5, a door machine 11 for opening and closing the car door 9 and the landing door 10 is mounted. In addition, a fence 12 is provided on the upper part of the car 5 to restrict a moving range of the worker when working on the car 5.

In such an elevator, as shown in FIG. 14, a part of the driving device 2 is arranged in an area where the car 5 is projected in the elevating direction. That is, when viewed from above, a part of the driving device 2 overlaps with the car 5. For this reason, there is a possibility that the worker may collide with the drive device 2 when working on the car 5. On the other hand, the provision of the fences 12 prohibits workers from entering the area S 1 directly below the drive unit 2.

Also, in the area S2 where the worker can move on the car 5, even if the car 5 is moved to the uppermost position, the space S3 is secured above, so that the worker can stand safely while standing. Work can be done.

However, on the car 5, various devices are arranged in addition to the door machine 11, so that it is difficult to actually install the fence 12 or even if the fence 12 is provided, the work The pace may be quite narrow.

Next, FIG. 15 is a side view showing a conventional elevator similar to that shown in, for example, Japanese Utility Model Publication No. 48-3961, and FIG. 16 shows the elevator of FIG. It is a top view. In the figure, a ceiling detection plate 14 is suspended from the ceiling of the hoistway 1 via a plurality of suspension members 13.

In such an elevator, when the worker is working on the car 5 and the car 5 rises and hits the ceiling detection plate 14, it is detected by a sensor (not shown). Is detected, and the ascent of car 5 is stopped. Therefore, the worker is prevented from colliding with the drive device 2.

However, since the ceiling detection plate 14 extends above the entire car 5, the area S 3 cannot be used as a maintenance space, and the maintenance work of the driving device 2 cannot be performed from the car 5. There was a point. Furthermore, in order for the worker to stand on the car 5 when the car 5 moves to the top floor, the ceiling of the hoistway 1 needs to be raised, and the space in the building is effectively used. Inhibits. .

Next, FIG. 17 is a side view showing a conventional elevator similar to that shown in, for example, Japanese Patent No. 2868627, and FIG. 18 shows the elevator of FIG. In the plan view c, a plurality of chains 15 are suspended from the driving device 2. In such an elevator, before the worker on the car 5 hits the chain 15 or looks at the chain 15 before colliding with the drive 2, Collisions can be avoided.

However, depending on the position of the chain 15 and the position of the worker on the car 5, the worker may not touch the chain 15 or may not be aware of the chain 15, ensuring sufficient safety. Can not do. Disclosure of the invention

The present invention has been made to solve the above-described problems. Yes, a work space on the car can be secured, the drive can be maintained from above the car, and an elevator that can more safely prevent the worker from colliding with the drive — on the evening car The purpose is to obtain a work safety device.

In the elevator safety device for elevators according to the present invention, the driving device for raising and lowering the car is arranged at the upper part of the hoistway, and a part of the driving device projects the car in the direction of raising and lowering. It is installed in the elevators located in the area, is suspended in the hoistway, and has a drive device that allows maintenance work of the drive device from the car. A detection plate that is disposed between the two and is displaceable upward by being pressed from below; a cushioning material attached to a lower surface of the detection plate; a plurality of detection switches that detect upward displacement of the detection plate; And a stop circuit for stopping the raising of the car when at least one of the detection switches is operated by an upward displacement of the detection plate.

Further, in the elevator safety device for elevators according to the present invention, a driving device for raising and lowering the car is disposed at an upper portion in the hoistway, and a part of the driving device projects the car in the direction of raising and lowering. A projector installed on an elevator disposed in the area, installed on a side wall of the hoistway, and emitting a plurality of light beams traveling horizontally below the driving device, facing the projector. It has a receiver installed on the side wall of the hoistway to receive the light beam emitted from the light emitter, and a stop circuit that stops raising the car when at least one of the light beams is cut off. is there. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view showing an elevator according to Embodiment 1 of the present invention,

Fig. 2 is a plan view showing the elevator of Fig. 1.

Fig. 3 is a cross-sectional view of the essential parts of the safety device for work on the car in Fig. 1,

FIG. 4 is a cross-sectional view showing a state where the airbag of FIG. 3 is pressed from below.

FIG. 5 is a circuit diagram showing a control circuit of the on-car work safety device of FIG. 1,

FIG. 6 is a plan view showing an elevator car safety device according to Embodiment 2 of the present invention.

FIG. 7 is a side view showing the on-car work safety device of FIG. 6, FIG. 8 is a side view showing an elevator in accordance with Embodiment 3 of the present invention, FIG. 9 is a plan view showing the elevator in FIG. 8,

FIG. 10 is a circuit diagram showing a control circuit of the on-car work safety device of FIG. 8,

FIG. 11 is an explanatory view showing a state in which an operator enters between the light emitter and the light receiver of FIG. 8, and FIG. 12 is a plan view showing the on-car work safety device of FIG.

Figure 13 is a side view showing an example of a conventional elevator.

FIG. 14 is a plan view showing the erepeater of FIG. 13,

FIG. 15 is a side view showing another example of the conventional elevator.

FIG. 16 is a plan view showing the elevator of FIG. 15,

FIG. 17 is a side view showing still another example of the conventional elevator.

FIG. 18 is a plan view showing the elevator of FIG. 17. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Embodiment 1

FIG. 1 is a side view showing an elevator in accordance with Embodiment 1 of the present invention, and FIG. 2 is a plan view showing the elevator in FIG. In the figure, a driving device 21 is fixed to an upper portion in a hoistway 1. The drive device 21 includes a motor 22, a sheave 23 rotated by the motor 22, a reducer 24 for transmitting the driving force of the motor 22 to the ship 23, and a The brake unit 25 for braking the rotation of the valve 23 is provided.

The middle part of the main rope 4 is wound around the sheave 23. A basket 5 and a counterweight 6 are suspended from the main rope 4. At the lower part of the car 5, a pair of car hanging wheels 7 around which the main rope 4 is wound are provided. Above the counterweight 6 is provided a weight suspension wheel 8 around which the main rope 4 is wound.

The car 5 is provided with a car door 9. On the landing side, a landing door 10 facing the car door 9 is provided. At the upper part of the car 5, a door machine 11 for opening and closing the car door 9 and the landing door 10 is mounted.

The car safety device 31 for preventing the worker on the car 5 from colliding with the drive device 21 is suspended from the ceiling of the hoistway 1. Safety device for work on the car 3 1 is arranged between the car 5 and the driving device 21 so as not to interfere with the car 5.

In addition, the on-car work safety device 31 is composed of a plurality of (four in the figure) hanging members 32, a detecting plate 33 suspended by the hanging members 32, and the detecting member 33 and the detecting plate 33. It has a plurality of detection switches 34 interposed therebetween, and an airbag 35 as a cushioning material attached to the lower part of the detection plate 33.

FIG. 3 is a cross-sectional view of a main part of the on-car work safety device 31 of FIG. The detection plate 33 is provided with a plurality of through holes 33a. The detection switch 34 is a first contact block made of insulating material connected to the lower end of the hanging device 32, and a second contact block made of insulating material fixed to the detection plate 33. A first contact 38 fixed to the first contact base 36, and a second contact 39 fixed to the second contact base 37 and connected to and separated from the first contact 38. are doing.

The second contact base 37 and the second contact 39 are provided with through holes 37a and 39a continuous with the through hole 33a. The first contact base 36 has a flange 36a for receiving the first contact 38, and a rod 36b penetrating through holes 33a, 37a, 39a. I have.

FIG. 4 is a cross-sectional view showing a state where the airbag 35 of FIG. 3 is pressed from below. When the airbag 35 is pressed from below, the airbag 35 is deformed and the detection plate 33 is pushed up. Thereby, the second contact base 37 and the second contact 39 fixed to the detection plate 33 move upward, and the second contact 39 is separated from the first contact 38.

FIG. 5 is a circuit diagram showing a control circuit of the on-car work safety device 31 of FIG. The contacts 34 A to 34 D of the four detection switches 34 are connected in series with each other. The contacts 34 A to 34 D are normally closed contacts. When any one of the contacts 34 A to 34 D opens, the stop circuit 40 stops the raising of the car 5.

In the above-described elevator operation, when the car 5 is raised while working on the car 5 while the worker is in the area S 1 immediately below the drive device 21, the worker is forced into the airbag 3. In 5, the detection plate 33 is pushed up. As a result, the detection switches 34 are opened, and the raising of the car 5 is stopped. Therefore, it is possible to more safely prevent the worker from colliding with the drive device 21. In addition, a sufficient work area S2 on the car 5 can be ensured, and the driving device 21 can be maintained from the car 5. Further, since the airbag 35 is used, the impact of the collision with the on-car work safety device 31 can be sufficiently reduced, and the safety can be further enhanced. Further, when a plurality of detection switches 34 are provided and any one of them is operated, the raising of the car 5 is stopped, so that the reliability can be improved. In the first embodiment, the airbag 35 is shown as the cushioning material. However, the airbag 35 is not limited to this, and may be, for example, a sponge or styrene foam. Embodiment 2

Next, FIG. 6 is a plan view showing an on-car work safety device for elevators according to Embodiment 2 of the present invention, and FIG. 7 is a side view showing the on-car work safety device of FIG. In this example, a tray-like oil receiving portion 41 a is provided on the upper surface of the detection plate 41. Other configurations are the same as in the first embodiment.

In FIG. 6, in the on-car work safety device, the lubricating oil leaking and dropping from the reducer 24 of the drive device 21 ゃ bearing (not shown) or the like is received by the oil receiving portion 41 a. For this reason, the lubricating oil is prevented from falling onto the car 5. Embodiment 3.

Next, FIG. 8 is a side view showing an elevator in accordance with Embodiment 3 of the present invention, and FIG. 9 is a plan view showing the elevator in FIG. In this example, an optoelectronic proximity detection device having a projector 51 and a photodetector 52 that are installed on the side wall of the hoistway 1 and that face each other is used as the on-car work safety device. The plurality of light beams 53 emitted from the light projector 51 travel horizontally below the driving device 21 and are received by the light receiver 52. That is, the light emitter 51 and the light receiver 52 are arranged at a position lower than the drive device 21. The overall configuration of the elevator is the same as in the first embodiment.

FIG. 10 is a circuit diagram showing a control circuit of the on-car work safety device of FIG. The output contact 54 of the photoelectric proximity detection device is connected to a stop circuit 40 for stopping the raising of the car 5. In such an elevator, when the car 5 is lifted while working on the car 5 while the worker is in the area S1 directly below the drive unit 21, before the collision with the drive unit 21, As shown in FIG. 11, an operator is located between the light emitter 51 and the light receiver 52. At this time, as shown in FIG. 12, a part of the plurality of light beams 53 is blocked by the operator. When the light beam 53 is cut off, the light beam 53 is detected by the light receiver 52, the output contact 54 is opened, and the raising of the car 5 is stopped.

Therefore, it is possible to more safely prevent the worker from colliding with the drive device 21.c Also, a sufficient work area on the car 5 can be secured, and the drive device 21 is maintained from the car 5 be able to. Further, since the worker only blocks the light beam 53, the worker does not receive any impact due to the collision. Further, when a plurality of light beams 53 are emitted and any one of them is cut off, the elevation of the car 5 is stopped, so that the reliability can be improved.

Claims

The scope of the claims

1. A drive device for raising and lowering the car is arranged at the upper part of the hoistway, and a part of the drive device is arranged in the area where the car is projected in the direction of its elevation. A safety device on the car for the elevator that is provided, the safety device being suspended in the hoistway and the drive device so as to allow maintenance work of the drive device from the car. A detection plate which is disposed between the above cages and which can be displaced upward by being pressed from below,

Cushioning material attached to the lower surface of this detection plate,

A plurality of detection switches for detecting an upward displacement of the detection plate; and

A stop circuit that stops raising the car when at least one of the detection switches is operated due to upward displacement of the detection plate.

Elevator is equipped with a work safety device on the basket.

2. The elevator according to claim 1, wherein the cushioning material is an airbag.

3. The detection plate is suspended by a plurality of hanging members, and the detection switch is provided between each of the hanging members and the detection plate. Item 1. The safety device for work on the car in the elevator of item 1.

4. The detection switch has a first contact fixed to the hanging device and a second contact fixed to the detection plate, and the detection switch is provided above the detection plate. 4. The safety device according to claim 3, wherein the second contact is separated from the first contact by the displacement.

5. The elevator car safety device according to claim 1, wherein an oil receiving portion for receiving oil dropped from the driving device is provided on an upper surface of the detection plate.

6. A drive device for raising and lowering the car is arranged at the upper part of the hoistway, and a part of the drive device is arranged in an area where the car is projected in the direction in which the car is raised and lowered. A safety device provided on a car for elevators provided on the elevator, which is installed on a side wall of the hoistway and emits a plurality of light beams traveling horizontally below the driving device;

A light receiver that is installed on a side wall of the hoistway so as to face the light projector and receives the light beam emitted from the light projector; and

A stop circuit that stops raising the car when at least one of the light beams is cut off

Elevator is equipped with a work safety device on the basket.