JPH07277626A - Short circuiting device of elevator safety switch - Google Patents

Abstract

PURPOSE:To provide a short circuiting device of an elevator safety switch, by which forgetting to detach a short circuiting device for temporarily negating the operation of a safety switch can be prevented, and no bad influence is exerted even in the case of forgetting to detach the same. CONSTITUTION:A short circuiting device 6 comprises first, second and third clip terminals, 7, 8, 9, an annunciator 10 and a timer 11, therein a normally closed time contact 11b1 is interposed between the first and second clip terminals 7, 8, and a normally closed time contact 11b2, the annunciator 10 and the timer 11 which are connected in series to one another are interposed between the first and third clip terminals 7, 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short circuit device for an elevator safety switch.

[0002]

2. Description of the Related Art A conventional device of this type is disclosed in Japanese Patent Laid-Open No.
As described in Japanese Patent No. 177285, an intercom that connects the inside of the elevator car and the machine room, a safety switch that is provided in the hoistway, and detects the movement allowable position of the car and stops the car. A short circuit device for an elevator safety switch, which is used at the time of operation inspection work of this elevator for the elevator equipped with, and which blocks the operation of the safety switch, is provided in the machine room, and detects the calling state of the intercom. Detection means,
There is known a structure provided with a blocking unit that operates by the detection signal of the detecting unit and blocks the operation of the safety switch.

[0003]

The above-mentioned conventional device is a device in which a short-circuit device is connected to both sides of a contact of a safety switch to be short-circuited, and when the intercom start button is pressed, a short-circuit state is produced. The switch can be short-circuited from inside the car, but no measures have been taken to prevent forgetting to remove the short-circuit device after the inspection work is completed. Therefore, if you forget to remove it, it will remain as it is. Also, when the intercom button is pressed, a short circuit occurs, so if you forget to remove the short-circuit device and remain installed, the safety switch will be short-circuited even when the emergency intercom button is pressed. Occur.

An object of the present invention is to provide a short-circuit device for an elevator safety switch, which can prevent forgetting to remove it and enable the operation of the safety switch to be effective even if the user forgets to remove it.

[0005]

[Means for Solving the Problems] The above-mentioned object is a normally-closed contact of a safety switch that operates when the car reaches the final position beyond the allowable position on the uppermost floor side or the lowermost floor side, and is linked to this safety switch. In a short-circuit device for an elevator safety switch, which is connected in series with a relay that outputs a signal for stopping the traveling of the car and is interposed between the power sources P and N, the car is moved beyond the final position. It is used when performing work in a state where it is moved to a position, or in a state where it is moved, and a first terminal connected to the power supply side of the normally closed contact and a non-power supply side of the normally closed contact. A second terminal connected, a third terminal connected to the other side of the power source, a timer interposed between the first terminal and the third terminal, and connected in series to each other, an alarm device And normally closed time limit of the timer If, it has a configuration that includes a normally closed limit contact of the first terminal and the timer interposed between the second terminal.

[0006]

As described above, when each terminal of the short-circuit device is connected to a predetermined location, the first and third terminals, that is, the power source P-
An alarm device is interposed between N and sounds. Therefore, the sounding informs the machine room that the short-circuit device is attached, and prevents the user from forgetting to remove it. Also, when the timer completes counting the preset predetermined time, its normally closed timed contact opens, and when the safety switch opens, the relay is deenergized and the opening / closing operation of the safety switch is effective, It becomes the same state as.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, P and N are DC power supplies, 1b is a normally closed contact point of the final safety switch provided on the uppermost floor side beyond the allowable position, 3 is an emergency stop switch provided in the car, and 4 is A relay for detecting the safety switch operation, 4a is a normally open contact of the relay 4, 5 is an operation control circuit, 6 is a short circuit device of the safety switch, and the first clip terminal 7, the second clip terminal 8 and the third clip terminal 8 are provided. It is composed of a clip terminal 9, an alarm 10 for a buzzer, a melody, a chime, etc., and a timer 11 having a contact manual reset switch. The normally closed contacts 1b and 2b of each safety switch, the emergency stop switch 3 and the relay 4 are connected in series with each other, and the power source P-N
Is intervened between. A normally closed timed contact 11 of a timer 11 is provided between the first clip terminal 7 and the second clip terminal 8.
b ₁ is interposed and between the first clip terminal 7 and the third clip terminal 9 is a normally closed timed contact 11 b ₂ of the timer 11.
The alarm device 10 and the timer 11 are interposed in a state of being connected to each other in series.

Although not shown in the drawing, there are also safety catch switches (switches for operating the emergency stop device) and other safety switches as safety switches, and these normally open contacts are also connected in series with the contacts 1b, 2b. Has been done.
Next, the operation when the short-circuit device is used for overhauling the electromagnetic brake will be described.

(1) After the car is operated to the top floor, the elevator controller in the machine room is turned off, and the clip terminals 7, 8 and 9 of the short-circuit device 6 are connected to the controller as shown in FIG. At this time, the first and second clip terminals 7 and 8
Is the normally closed contact 1b (or 2) of the safety switch to be short-circuited.
Connect to both sides of b). The second clip terminal 8 may be connected between the normally closed contact 2b and the emergency stop switch 3.

(2) Turn on the power. This allows timer 1
1 starts and the alarm 10 sounds.

(3) When the final safety switch is reached beyond the allowable position, the normally closed contact 1b opens. However, since the normally closed timed contact 11b _{1 of the} short-circuit device 6 is closed, the relay 4 is not deenergized and the car can continue to rise.
Stop the car when it reaches a position where it cannot be raised anymore.

(4) Turn off the power, disassemble the electromagnetic brake,
Perform inspection work and assembly work.

(5) After the work is completed, the power is turned on and the car is lowered at a low speed. If the car is not operating at this time,
By operating the contact manual return switch of the timer 11, the normally closed contacts 2b ₁ and 2b ₂ are closed. As a result, the car can be operated, the timer 11 is started, and the alarm 10 sounds.

(6) When the car reaches the position lower than the position of the final safety switch, the car can be operated without short-circuiting the normally closed contact 1b.

(7) When the car reaches the top floor, the operation is stopped, the control device in the machine room is temporarily turned off, and the short-circuit device 6 is removed. Since the alarm device 10 is activated until the normally closed timed contact 11b ₂ is opened by the timer 11 for a preset predetermined time unless the power is turned off, forgetting to remove the alarm device 10 can be prevented. Even if you forget to remove it, the timer 11 starts to operate when the preset time elapses and the normally-closed timed contact 11b.
_{Since 1} is opened, the normally-closed contact 1b does not become a short circuit state even if the clip terminals 7, 8 and 9 are still connected, and there is no difference from the normal state.

In the above embodiment, the normally closed time limit contact 11b ₂ of the timer 11 is connected in series with the alarm device 10 so that the alarm device 10 stops ringing when the timer 11 completes counting for a predetermined time. The alarm 1 is provided between the first and third clip terminals 7 and 9 without interposing the contact 11b _2.
It is also possible to interpose a series of 0 and the timer 11. In this case, if the short-circuit device 6 is attached and the power is on, the alarm 10 continuously sounds during that time, but it is extremely effective in preventing forgetting to remove the alarm.

[0017]

As described above, according to the present invention, it is possible to prevent forgetting to remove the short-circuit device that temporarily disables the operation of the safety switch, and even if the user forgets to remove it, the operation of the safety switch is prevented. It is possible to provide a short-circuit device for an elevator safety switch that can be activated.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

[Explanation of symbols]

1b, 2b Normally closed contact of final safety switch 3 Emergency stop switch 4 Relay 6 Short circuit device 7 First clip terminal 8 Second clip terminal 9 Third clip terminal 10 Alarm device 11 Timer 11b ₁ , 11b ₂ Timer 11 Normally closed time contact

Claims (2)

[Claims] 1. A normally-closed contact of a safety switch that operates when the car reaches a final position beyond an allowable position on the uppermost floor side or the lowermost floor side, and operates in conjunction with the safety switch to drive the car. In a short-circuit device for an elevator safety switch, which is connected in series with a relay that outputs a signal for stopping the car, and which moves or moves the car to a position beyond the final position. A first terminal connected to the power supply side of the normally-closed contact, which is used when performing work in a state where
A second terminal connected to the non-power source side of the normally-closed contact, a third terminal connected to the other side of the power source, and a first terminal and a third terminal interposed between the terminals and connected in series. A timer connected to, an alarm and a normally closed time contact of the timer,
A short-circuit device for an elevator safety switch, comprising: a normally closed timed contact of the timer interposed between the first terminal and a second terminal. 2. The first connected to the power supply side of the normally closed contact
, A second terminal connected to the non-power source side of the normally closed contact, a third terminal connected to the other side of the power source, and a first terminal
A timer and an alarm that are interposed between and connected to the first terminal and the third terminal, and a normally closed time contact of the timer that is interposed between the first terminal and the second terminal. The short-circuit device for an elevator safety switch according to claim 1, wherein: