JPH08259137A - Maintenance operation device for hydraulic elevator - Google Patents

Abstract

PURPOSE: To sufficiently secure the safety of the maintenance work over a car, and to move the car to the check position at the highest part of a hoistway at the time of checking over the car. CONSTITUTION: In this maintenance operation device for hydraulic elevator, a raising command 8 for maintenance is operated by pushing a maintenance upward operating button 9a provided over a cage, and the raising command 8 for maintenance is stopped by the operation of a maintenance upward operation limiting switch provided inside of the hoistway. This maintenance operating device for hydraulic elevator is provided with short-circuit switch limiting means 10a, 11b, T, Ta, which can generate a short-circuit of the maintenance upward operation limiting switch with the operation of the maintenance upward limiting switch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator maintenance operation apparatus, and more particularly to a hydraulic elevator maintenance operation apparatus suitable for ensuring the safety of maintenance personnel.

[0002]

2. Description of the Related Art Generally, a safety fence for performing maintenance work must be installed above an elevator car. Regarding the height of this safety fence, it is desirable to comply with 1100 millimeters defined by regulations.

However, in order to ensure the safety of maintenance work performed on a car, such as a hydraulic elevator, which is legally permitted even if the facing distance between the ceiling of the hoistway and the car is short, in order to ensure the safety of the maintenance work performed on the car, the actual open flat 1-85368 A maintenance operation means for performing a predetermined maintenance operation of the car, a foldable portion provided at the top of the car, and a switch for detecting at least one of rising and folding of the foldable portion are provided. It is described that the maintenance operation means is operated by the detection of.

[0004]

When performing the above-mentioned elevator car maintenance inspection, the elevator car safety fence that can sufficiently secure the safety work of the safety work is an obstacle to the elevator. , I cannot move to the inspection position at the top of the hoistway. For this reason, there is a drawback that the inspection must be performed using a ladder or the like on the car.

An object of the present invention is to provide a maintenance operation device for a hydraulic elevator, which is capable of ensuring a sufficient safety of maintenance work on a car during maintenance and inspection on the car and moving to the inspection position at the top of the hoistway.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a maintenance lift command provided at the upper part of a hoistway by operating a maintenance lift command by pressing a maintenance lift operation button provided on a car. In a maintenance operation device for a hydraulic elevator that stops the maintenance increase command by operating an operation limiting switch, a short-circuit switch limiting means that enables the maintenance rising operation limiting switch to be short-circuited by operating the maintenance rising operation limiting switch is provided. It is a thing.

[0007]

With this configuration, when the maintenance ascending operation is performed on the car and the maintenance ascending operation restriction switch is activated to stop the car once, the operator determines the positional relationship between the car and the ceiling of the hoistway. In addition, since the car can be raised in the maintenance operation, the safety of the operator in the maintenance ascent operation can be ensured and the work at the top of the hoistway can be facilitated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 2, a car top instrument box 1A is installed on the top of the car 1, and a car top operating device 2 is detachably attached to the car top instrument box 1A.
In addition, a final end switch 4 which is a safety switch for stopping the traveling of the car slightly below the ceiling of the hoistway 3 and preventing the car 1 from colliding with the ceiling of the hoistway 3, and a car operating device below this switch 2, the maintenance rising operation limiting switch 5 for stopping the maintenance rising operation is arranged.

Also, between the power supply P and N, the contact 6a of the maintenance raising button in the car (not shown) provided in the car 1 and the maintenance operation command relay (not shown) that is activated when the maintenance switch (not shown) in the car is turned on An open contact 7a1 and a contact 4b that opens when the cam 1B operates the final end switch 4 and a maintenance raising operation command relay 8 that causes a maintenance raising operation when energized are connected in series. Further, between the connection point of the normally open contact 7a1 and the contact 4b and the power source P, the contact 9a of the maintenance raising button (not shown) provided in the device 2 connected in parallel and respectively connected in series, the normally open contact 7a2, and the normally open contact described later are provided. Contact 1
1a is connected, and a contact Ta described later is connected in parallel to the normally open contact 11a.

Similarly, when a contact 10a which is closed only when a switch (not shown) provided in the car operating device 2 is pressed between the power sources P and N and a normally closed contact 11b which will be described later are energized, a predetermined time elapses. For example, a contact T that closes after 5 seconds
Timers each including a are connected in series, and a buzzer BZ provided in the on-car device box 1A is connected in parallel with the timer T.

Similarly, the operation detection of the maintenance rising operation limiting switch having the contact 5b which is opened when the cam 1B operates the maintenance rising operation limiting switch 5 between the power sources P and N, the normally open contact 11a and the normally closed contact 11b is detected. The relay 11 is connected in series.

Next, the operation will be described.

When a worker A who has boarded on the car 1 presses a maintenance up button (not shown) of the car operating device 2 in order to check the condition of the ceiling of the hoistway 3, P-9a-7 is displayed.
The circuit a2-11a-4b-8-N is formed, the maintenance up operation command relay 8 is energized, and the car 1 is operated up for maintenance.

Next, when the car 1 comes above the hoistway 3 and the cam 1B actuates the maintenance ascending operation limiting switch 5, P-
Since the circuit of 5b-11-N is opened and the maintenance rise operation limit switch operation detection relay 11 is deenergized, P-9a-7
The circuit of a2-11a-4b-8-N is opened, the maintenance up operation command relay 8 is deactivated, and the car 1 is stopped. Here, by stopping the car 1, the worker A is made aware that the car 1 has come to the upper part of the hoistway 3 and can change the work posture and the like.

Next, when it is desired to further raise the pressure, a maintenance raising button (not shown) is pushed while pushing a switch (not shown) provided in the on-the-car operating device 2, and P-10a-11b.
-TN and P-10a-11b-BZ-N circuits are formed, the timer T is energized, the buzzer BZ sounds, and the contact Ta of the timer T is closed after 5 seconds.
9a-7a2-Ta-4b-8-N circuit is formed,
The maintenance rising operation command relay 8 is energized, and the car 1 rises again. Here, in the car 1, the cam 1B has the final end switch 4
Can be raised until activated.

[0017]

According to the present invention, when the maintenance ascending operation is performed on the car and the maintenance ascending operation limit switch is actuated to stop the car once, the operator confirms the positional relationship between the car and the hoistway ceiling. In addition, since the car can be raised during the maintenance operation, the safety of the operator during the maintenance elevation operation can be ensured and the work on the top of the hoistway can be facilitated.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation on a car above a hoistway according to an embodiment of the present invention.

[Explanation of symbols]

 5 Maintenance rising operation limit switch 8 Maintenance rising command 9a Maintenance rising operation button provided on the car 10 Switch 11 Maintenance rising operation limiting switch operation detection relay T Timer Ta Timer T contact

Claims (2)

[Claims] 1. A hydraulic elevator in which a maintenance up command is operated by pressing a maintenance up operation button provided on a car, and the maintenance up command is stopped by operating a maintenance up operation limiting switch provided in an upper part of a hoistway. A maintenance operation device for a hydraulic elevator, comprising: a maintenance operation device, comprising short-circuit switch limiting means for enabling short-circuiting of the maintenance increase operation limit switch when the maintenance increase operation limit switch is operated. 2. The maintenance operation device for a hydraulic elevator according to claim 1, wherein the short-circuit switch limiting means is a means that is activated a predetermined time after the maintenance rising operation limiting switch is activated.