JPH02255483A - Safety device of elevator platform door - Google Patents

Abstract

PURPOSE:To prevent a passenger from falling on an elevating path by providing a detector adapted to operate even if the contact of any platform door switch is opened when a cage door is closed during normal operation and an alarm device, thereof CONSTITUTION:A cage arrives at the first floor and a door of the first floor platform is opened. At this time, as contacts 11, 2 are opened, relays 3, 4 are de-energized, and as contacts 3a, 3b are opened, relays 5, 7 are de-energized. The doors of the cage and the platform are closed after the lapse of a designated time, so that the relays 3, 4 are de-energized. Accordingly, a contact 4a2 is closed and the contact 3b is opened, so that the relay is invalidated to cause alarming of an alarm device. The relay 5 is also energized to normally operate the cage. At this time, a platform door at the second floor, for example, is opened. Whereupon, a contact 12 is opened to de-energize the relay 3 and the contact 3b is closed to form a circuit of P-6a-4a2-3b-7N, whereby an alarm device 8 is operated to give an alarm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a safety device for an elevator landing door.

[Conventional technology]

In an elevator, if the landing door of a landing floor with no car opens, there is a risk of the person falling into the hoistway. A hook is provided on the landing door, and when the first landing door is closed, it is locked via this hook. When the car door is opened on the landing floor where the car is located, the lever of the car door releases the hook via the engaging element and the car door opens in synchronization with the car door. Furthermore, since it is extremely dangerous to drive with the car door and landing door open, for example, as described in Japanese Patent Publication No. 49-7667, a car system that detects when the car door and landing door are closed is required. A door switch and a landing door switch are provided, and the car runs when it is detected that all of these switches are activated.

[Problem to be solved by the invention]

If an elevator has been used for many years, the hooks will wear out and the locking force will decrease, and if a drunk passenger applies abnormal force to the hall door, the hall door will open, causing the drunk passenger to fall into the hoistway. There was a problem that it was extremely dangerous.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides an inexpensive safety device that issues an alarm when a landing door on a landing floor where no car is normally open is opened.

[Means to solve the problem]

The purpose of this is to use the current landing door switch and to create a detection device that activates when the car door is closed during normal operation, regardless of the contact point of the landing door switch on any of the multiple landing floors being opened, and a detection device that activates when the car door is closed during normal operation. This can be accomplished by installing a warning device that issues an alarm at the airport, landing floor, control room, etc.

[Effect]

If the landing door is completely closed during normal times.

The warning device is not activated, however, the detection device is activated if a landing door on any floor is open.

Since an alarm is issued at the landing etc., it is easy to know that the landing door is open, which has the effect of preventing a person from falling into the hoistway.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. It is assumed that the elevator can be used on the 1st to 4th floors.

The figure shows an electric circuit diagram of an embodiment of the present invention, where P and N are positive and negative power supply terminals, and lla to 14a are from the first floor to
2a is the normally open contact of the door switch that closes when the 4th floor landing door is closed. 2a is the normally open contact of the car door switch that closes when the car door is closed. 3 is the normally open contact 11 of the hall door switch.
4a1 is a relay that is energized when the normally open contact of the car door switch is closed; 3a is its normally open contact; 3b is its normally closed contact; 4 is a relay that is energized when the normally open contact of the car door switch is closed;
, 4a are the normally open contacts, and 5 is the contact 3a.

A relay 4a is energized when the relay 5 is closed, and when the relay 5 is energized, the car can be started by a control device (not shown). 6a is a normally open contact of a relay (not shown) that is energized during normal operation of the elevator; 7 is a contact 6a, 3b, 4a,
7a is its normally open contact, 8 is a warning device that issues an alarm when contact 7a is closed,
It is installed in the car, landing area, control room, etc.

Next, the present invention will be explained in detail. In addition, contact 6 is in normal condition.
It is assumed that a is closed. The basket has now arrived at the first floor,
Assume that the car and the first floor landing door are opened. At this time, since contacts 11a and 2a are open, relays 3 and 4 are deenergized, and contacts 3 ai and 3 a.

opens, so relay 5.7 is de-energized. After a predetermined time, the heel and landing doors are closed, so relays 3 and 4 are energized. Therefore, the contact 4a2 is closed and the contact 3b is opened, so the relay 7 is disabled and the warning device 8 does not sound. Note that relay 5 is also energized and the car operates normally.

At this time, for example, suppose that the second floor landing door is opened. As a result, contact 12 opens, relay 3 is deenergized, and contact 3b closes, so P-6a-4a, -3b-7-N
A circuit is formed, and when the relay 7 is energized, the contact 7a closes and the warning device operates to issue an alarm.

Therefore, passengers can know that an abnormality has occurred in the elevator, and for example, the manager can close the second floor landing door to restore normal operation and prevent accidents. In addition,
During maintenance, the landing door may be opened for inspection, but issuing an alarm at this time would be noisy, so in this case, the contact 6a is opened and the alarm is not issued.

In the above embodiment, the warning device sounds, but the warning device may be displayed on the car, the landing, the control room, etc., or may be notified remotely.

〔Effect of the invention〕

As described above, according to the present invention, when a car door is closed during normal times, the warning device is configured to sound no matter which landing door is opened, so that it is easy to know that a landing door has been opened. This has the effect of preventing passengers from falling into the hoistway.

[Brief explanation of drawings]

The figure shows an electrical circuit diagram of an embodiment of the present invention. 11a to 14a... Normally open contacts of landing door switches, 2
a... Normally open contact of car door switch, 6a... Normally open contact of relay energized during normal operation, 7... Detection relay, 8... Warning device.

Claims (1)

[Claims] (1) In a safety device for an elevator landing door that is equipped with a switch that detects when an elevator car door and a plurality of landing doors are closed, during normal operation, when the car door is closed, the car door switch is activated. Safety of an elevator landing door, characterized in that it is provided with a device that detects whether any of the plurality of landing door switches is activated and not activated, and a warning device that issues a warning when the detection device is activated. Device.