JPH0891730A - Safety device for elevator - Google Patents

Abstract

PURPOSE: To automatically maintain the safety in maintenance when a door is opened by a key, by installing a relay for separating an elevator safety detector by the contact point output which is interlocked with the releasing device of the door, self retention circuit, and a maintenance safety circuit consisting of a push button for resetting the self retention circuit. CONSTITUTION: A mechanically interlocked microswitch microswitch ULS is installed on the manually operated releasing device UL of the door at the lowest floor hall an elevator. The microswitch ULS is operated by turning the releasing lever of the releasing device UL, and a relay RYS is operated to form a self retention circuit by the contact point for the self retention of the relay RYS, and even if the microswitch ULS is cut off, a retention safety circuit consisting of a reset pushing button switch PB is maintained. Accordingly, if the relay RYS is turned ON, an elevator safety detecting device ELS is cut off from an electric power source, and also the elevator operation controller is cut off, and the operation control is put into a repose state, and the safety in maintenance is automatically maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for maintenance and inspection of elevators.

[0002]

2. Description of the Related Art Maintenance work for elevator pits is
First of all, the operator opens the bottom floor door and then opens the pit safety switch (knife switch etc.) KS to prevent the elevator system from operating. This is because the safety detection device or the operation control device of the elevator is disconnected from the power supply so that the elevator does not operate during the work, and then the work in the pit is performed.

Here, the elevator safety detector is
For example, it consists of a number of detectors that detect whether various elevator functions are operating normally, such as a detector that confirms door closing or a door safety operation detector. The detector operates as if it is not operating normally, releasing relay RYC, which in turn disconnects the elevator operation controller from the power source and stops elevator operation.

[0004]

By the way, in order to ensure the safety during maintenance and inspection as described above, the worker forgets to turn off the pit safety switch KS, and the pit safety switch KS becomes unpredictable because of getting used to it and annoyance. There was a risk of neglecting use, and there was a problem in terms of safety during maintenance. As described above, if the worker neglects to use the pit safety switch, there is a problem in terms of safety during maintenance. Therefore, in addition to the conventional pit safety switch, the present invention allows the maintenance worker to check the pit at the bottom floor. It is an object of the present invention to automatically establish safety at the time of maintenance (maintenance safety circuit) when a door of a landing is manually opened, that is, when a door is opened with a key. Further, by manually releasing the maintenance safety circuit, the operator intentionally performs the action, and the purpose is to further improve the safety of the maintenance safety circuit.

[0005]

[Means for Solving the Problems] In addition to the conventional pit safety switch, as a means for detecting that the unlocking device at the door of the lowest floor of the elevator is manually (key) unlocked, A switch that operates mechanically when the device is manually (key) unlocked is provided, and a circuit (maintenance safety circuit) that automatically (electrically) disconnects the elevator safety detection device and operation control device is provided. After disconnecting these operation control systems of the elevator, the return is made by a manual reset push button.

[0006]

Operation: The unlocking device is manually operated, the relay is operated to disconnect the operation control system of the elevator from the power source, and the self-holding circuit self-holds the maintenance safety circuit.
Unless the worker intentionally resets the self-holding circuit, the maintenance safety circuit is maintained and the elevator operation remains stopped. This prevents the elevator from returning to the normal operating state carelessly, and by letting the worker consciously perform the reset operation, the attention of the worker can be directed to the mechanical operating state of the elevator. It will improve safety.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiment shown in FIG. Install a micro switch ULS that mechanically interlocks with the door unlocking device UL at the lowest floor of the elevator. The unlocking device inserts a key and turns it to unlock. At this time, the unlock lever is turned by rotating the key. The rotation of this lever activates the micro switch ULS. This is a switch ULS that works together when the unlocking operation is performed manually. It consists of a relay RYS that operates by this and its self-holding circuit (a contact circuit), and a reset push button switch PB that resets these circuits. A circuit is provided and this is the maintenance safety circuit. When this maintenance safety circuit is operated, the relay safety RYS b contact opens the elevator safety detector circuit,
Furthermore, a relay that disconnects the elevator operation control device ELC
RYC works. To the head of the elevator safety detection device ELS, the b contact of the relay RYS and the existing manual pit safety switch KS (knife switch) are connected in series.

With such a structure, when an operator unlocks the door of the lowest floor hall for pit inspection, the unlocking device UL
The micro switch ULS linked with is turned on and the relay RY
S works. A self-holding circuit is formed by the self-holding a contact of the relay RYS, and the maintenance safety circuit is maintained even if the microswitch ULS is turned off. When this relay RYS is turned on, its b contact opens, the elevator safety detection device ELS is disconnected from the power supply, the relay RYC is also released, the elevator operation control device ELC is disconnected, and the elevator operation control system stops. It becomes a state.

The reset of the maintenance safety circuit is performed by the reset pushbutton switch PB, and when the switch PB is manually operated, the relay RYS is released, the maintenance safety circuit is disconnected, and the safety of the elevator which has been disconnected. The detection device and the operation control device that has been in the dormant state respectively return to the normal operation state. This maintenance safety circuit operation should be combined with the manual operation of the conventional pit safety switch KS to create a double safety system.

[0010]

According to the present invention, the maintenance safety circuit automatically operates when the maintenance worker enters the pit and opens the door of the landing on the bottom floor, so that the safety at the time of work can be ensured and the conventional The safety can be further improved by using it together with the pit safety switch.

Further, since the circuit is reset by using a manual reset switch or a manual pit safety switch together,
The safe state is maintained unless the operator consciously operates these switches, and maintenance work can be performed with peace of mind.

[Brief description of drawings]

FIG. 1 is an exploded view of an electric circuit of the present invention.

[Explanation of symbols]

 PB… Reset push button KS… Pit safety switch RYS… Relay (safety detection device disconnection) RYC… Relay (operation control device disconnection) UL… Bottom floor hall door unlocking device ELC… Elevator operation control device

Claims (1)

[Claims] 1. A relay for disconnecting an elevator safety detection device by a mechanically interlocking switch provided in a manual unlocking device for a door at the lowest floor hall, its self-holding circuit, and this circuit. Elevator safety device, which is equipped with a maintenance safety circuit consisting of a push button for resetting.