JPS6296285A - Safety device for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a safety device for when a worker climbs onto an elevator car and performs work.

[Technical background of the invention and its problems]

In recent years, elevators have begun to be installed in relatively low-rise buildings. Particularly in buildings with 5 or 6 floors, single-barrel elevators and hydraulic elevators are becoming more popular due to architectural constraints.

As is well known, this type of elevator has a mechanical room that is
Because there is no rooftop machine room, the top dimension of the hoistway is generally small, and the clearance at the top when the car goes to the top floor is often close to the legal limit. Therefore, when a worker climbs onto the car during installation adjustment or maintenance inspection, there is often insufficient overhead clearance, which is extremely dangerous. Although rope elevators and hydraulic elevators each have minimum dimensions for the top clearance, it is often difficult for workers to stand upright on the car, and it is dangerous to travel to the top floor level for adjustments or inspections. Now. Therefore, a limit switch to ensure a top clearance is installed a predetermined distance below the top floor, and when driving for inspection, the switch is activated and the vehicle is forced to stop a predetermined distance before the top floor is secured to ensure safety. .

The above-mentioned conventional problems are shown in FIG. 4 for supplementary explanation.

The figure shows the case of a differential elevator, in which a worker gets on the car, runs it for inspection (upward operation), and the top clearance limit switch 9 is actuated by the cam 8 to force a stop. This indicates that the overhead size of workers is at its limit.

By the way, in this conventional method, during normal operation,
Since it is necessary to run the car to the top floor landing level, the limit switch 9 is enabled only during inspection, and only when the inspection switch +2b provided on the car main operation panel 12 is set to the "P" side and the car is running at low speed. It can be stopped in the state, but
If the inspection switch is set to the "normal" side and high-speed operation is unavoidable, the operator will be allowed to drive to the top floor level, making it impossible to ensure the safety of one worker.

In addition, if a worker accidentally returns the inspection switch 12b to the "normal side" and the car safety switch 12a to the "driving side," normal operation (high-speed driving) is possible, and a third party should If you press the call button, there is a danger of driving at high speed. This is true for other elevators with sufficient top clearance, but this type of elevator is particularly dangerous overhead. In particular, when the operator attempts to get off the car after the inspection work has been completed, there is a problem in that if the switch is operated incorrectly, such a dangerous situation may occur.

[Purpose of the invention]

To provide a device for ensuring safety by forcibly stopping the car at a position where a sufficient clearance at the top can be secured, regardless of the operating state such as inspection operation or running operation, when a worker rides on the car and performs upward operation.

[Summary of the invention]

The present invention provides a worker detection device for detecting the presence of a worker on the car, and when the device is emitting a detection output, a top clearance securing limit switch is enabled regardless of the operating state, and the limit switch is activated. Once the car reaches its position, the elevator car is forcibly stopped from rising to ensure the safety of the workers.

[Embodiments of the invention]

Examples are shown in FIGS. 1 and 2. Figure 1 (a) shows the worker detection circuit, 13 is the mud switch, 4 is the detection part connected to the output terminal of the mantle switch, PI, N
l is a power source.

The circuit in FIG. 1(b) shows a part of the elevator operation circuit, 15 is a descending operation relay, 16 is an ascending operation relay, 20b is a lower terminal floor deceleration limit switch, IOb
is also the upper terminal floor deceleration limit switch, and 9b is the third
Top clearance limit switch shown in figure, 17b
1 is an inspection operation relay contact (not shown), S, , , S are descending and ascending operation signals, respectively, and N2 is a control power source (negative bus). A normally closed contact (hereinafter referred to as a contact) is indicated by adding b to the symbol of each switch or relay.

Figure 2 shows how to install the worker detection device on the car. 5 is the car, 6 is the rope, 12 is the car main operation panel,
12a is an on-car safety switch, 12b is an inspection switch, and 13 is a mud switch, which are installed in a work space above the car and electrically connected to the car main operation panel by a cable.

In addition, the mud switch uses a tape-shaped spring material at the end of the conductor! @It is a sheet made of multiple rows of strip switches held by a green body and covered with vinyl or the like, and when a part of the switch is pressed, the conductor comes into contact and becomes conductive. It is highly flexible and is suitable for laying on somewhat uneven areas, such as on corners.

Incidentally, the mud switch is already commercially available, and its shape may be modified according to the work space on the car.

Conventionally, work on the car is carried out as follows.

That is, when the car is stopped, if the above-mentioned car safety switch 12a is set to the "stop" side, the car will not run no matter what operation is performed. In addition, when driving while inspecting equipment in the hoistway at inspection speed (low speed), set the inspection switch to the ``inspection 1'' side, then set the car safety switch to the ``travel side'' and set the ``up'' or ``up'' or Inspection operation can be performed by operating the "down" push button switch.

The operation of this embodiment will be explained with reference to FIG. Now, when the work tool is placed on the basket and the inspection switch 12b is turned to the 1'inspection'' side, the inspection operation relay 17 (not shown) is turned on, its contact 17b is opened, and the top clearance securing limit switch 9 is turned on.
Since the short circuit b is disconnected, the limit switch 9b becomes effective. In addition, the worker
3, this turns on, outputs the detection signal S, and turns on the detection relay 14. As a result, contact 14b
Since the top clearance limit switch 9b is also opened, the short circuit of the top clearance limit switch 9b is thereby also disconnected.

Therefore, the detection relay 14 has no particular effect within the range where the first inspection switch is set to the "inspection" side.

However, if the car has to run at normal speed (high speed) due to some request, the inspection switch must be set to the ``normal'' side.
However, according to the embodiment, since the detection relay is on, the contact 14b remains open, and the top clearance securing limit switch 9b is not disabled.In other words, even when running at high speed, the contact 14b remains open. Since this continues to be effectively maintained, the car can be stopped at a position where the top clearance is always maintained.

Also, during normal maintenance and inspection, the inspection switch was accidentally turned on with the car safety switch set to the "travel" side.
If the car is returned to the "normal" side, the conditions for normal operation will be established.If a general passenger, etc. were to press the hall call button (not shown) on the top floor, the car would not be able to be called. According to this embodiment, even if such an erroneous operation is made, the top clearance securing limit switch is enabled because the contact 14b is open, and the top clearance is stopped at a position where the top clearance can be maintained. can do.

In this embodiment, a mud switch is installed on the top of the car, and if a worker is on top of the car, the top clearance securing limit switch is always effective regardless of whether the inspection switch is set to the "inspection" or "normal" side. , the car can be stopped at a position where the top clearance can be ensured regardless of the running speed, so if it is unavoidable to leave the car on top of the car at normal operating speed (
The safety of workers can be ensured even when traveling at high speeds or when the inspection switch or car safety switch is operated incorrectly.

FIG. 3 shows an example in which a worker detection sensor 13A is provided. If a sensor emits an output when a worker is on the car and the detection relay 14 shown in FIG. 1 is turned on, the structure can be similar to that of the previous embodiment.

Various types of sensors can be considered, such as ultrasonic type, photoelectric type, and radio wave type, but they can be constructed in the same way.

When the car work page detection device described in the above-mentioned embodiment is operating effectively, that is, when the detection relay 14 is turned on, the a-contact of the relay sounds a flicker buzzer or the like. You can do it like this.

Furthermore, the a-contact of the relay can be used to check an indicator light provided on the car. If the indicator light is made thicker, it can also be used as an auxiliary work light.

As described above, according to the present invention, the presence of a worker on the car is automatically detected while the worker is in operation using sound or light, and the output is used to constantly activate the top clearance limit switch. This makes it possible to forcibly stop the car at a position where the top clearance can be secured, regardless of incorrect operation of switches or high or low running speed, greatly improving safety above the worker's head. It is possible to increase it.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing how to install the worker detection device of the embodiment shown in Fig. 1, and Fig. 3 is a diagram showing the installation method of the worker detection device of the embodiment shown in Fig. 1. Diagrams showing other embodiments,
FIG. 4 is a diagram for explaining the state of the top of the hoistway. 2... Hoistway top 3... Top floor landing 5... Car 9.9b... Top clearance securing limit switch 13.
・Work tool detection device i! (Mad Switch) Agent Patent Attorney Nori Ken Chika Yudo Hirofumi Mitsumata (αノ(b) Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Elevators equipped with a top clearance limit switch that is activated to forcibly stop the elevator when the car reaches the top of the hoistway during inspection or adjustment are equipped with a work tool detection device that detects when a worker is on top of the car. A safety device for an elevator, characterized in that the operation of the top clearance securing limit switch is enabled regardless of the operating state and the elevator is forcibly stopped in accordance with the output of the worker detection device.