JP2006256832A - Elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the safety of operator(s) in conducting the maintenance and inspection works on the over-car ceiling without impairing the convenience for execution of works. <P>SOLUTION: The elevator is furnished with a cable switch 4a along the peripheral edge of the over-car ceiling 1a. A cable switch 4b is installed on the ceiling 1a inside the place thereon where the cable switch 4a is mounted. When a pressure is given to the cable switch 4b, a sensor circuit 5 emits a control signal to an alarm signal processing part 6. Further when a pressure is given to the cable switch 4a, the sensor circuit 5 emits a control signal to the alarm signal processing part 6 and an elevator control board 7. When fed with the control signal from the sensor circuit 5, the alarm signal processing part 6 controls so that an alarm device 8 emits an alarm. When fed with the control signal from the sensor circuit 5, the elevator control board 7 controls existence or none of the rising/falling motions of the car 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevator having a function of maintaining the safety of a worker who performs maintenance / inspection work on a car.

  Conventionally, elevator maintenance and inspection work covers a wide variety of devices, including not only each device in the machine room but also a car and a device installed in a hoistway. Maintenance and inspection workers, when inspecting each device in the hoistway, such as switches and counterweights, are located inside the safety fence installed so as to enter the ceiling above the car and surround the ceiling. Do the work. In addition, the worker inspects each device in the hoistway sequentially while raising and lowering the car manually at a lower speed as compared with that during normal operation when necessary while riding on the car.

When a worker is climbing up and down on the car, part of the worker's body, such as the head and feet, should be outside of the upper ceiling edge while the car is moving up and down. If it protrudes, a part of the protruding body may come into contact with each device in the hoistway. As a technique for preventing this, for example, as disclosed in Patent Document 1, when a worker is climbing up and down the car on the ceiling above the car, a part of the worker's body is at the end of the car ceiling. A device that detects whether or not the vehicle has protruded from the top of the car is installed. Some control the lifting operation.
JP-A-8-113440

  In the above-described method, the lifting / lowering operation of the car is controlled after detecting that a part of the body such as the head and feet protrudes beyond the edge of the upper ceiling of the car. Depending on the timing at which it is detected that a part of the worker's body has protruded beyond the upper ceiling edge of the car, such as when the car is approaching each device in the hoistway, Even if this control is performed, it may not be possible to prevent a part of the protruding body from contacting each device in the hoistway as described above.

  In order to solve this problem, this should be detected before a part of the worker's body protrudes from the edge of the car ceiling, that is, when the worker's body part approaches the edge of the car ceiling. Therefore, it is considered that a part of the worker's body may be protruded from the end of the upper ceiling of the car by this detection, and the raising / lowering operation of the car is controlled. However, unless the worker moves further and a part of the worker's body protrudes from the end of the upper ceiling of the car, a part of the worker's body can be Since there is no danger of touching each device, maintenance and inspection work will be interrupted unnecessarily.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator capable of improving the safety of workers when performing maintenance / inspection work on a car ceiling without impairing the convenience of work. .

  That is, the elevator according to the present invention includes a first cable switch disposed on the ceiling above the car and a second cable switch disposed on the inner side of the first cable switch on the ceiling above the car. Provide an alarm when pressure is applied to the second cable switch when the car is moving up and down, and control the car ascending and lowering when pressure is applied to the first cable switch when the car is moving up and down It is characterized by that.

  The elevator according to the present invention includes a first cable switch disposed on a ceiling above the car, and a second cable switch disposed on an inner side of the first cable switch on the ceiling above the car, When a pressure is applied to the second cable switch during the raising / lowering operation of the car, an alarm is issued, and when the pressure is applied to the first cable switch during the raising / lowering operation of the car, the raising / lowering operation of the car is controlled. When a worker on the ceiling of the car approaches the edge of the ceiling, the part of the worker's body should not protrude from the edge of the ceiling Can call attention. In addition, even if a worker's body is out of balance and the part of the worker's body protrudes from the edge of the top ceiling of the car, there is a risk that the part of the worker's body will contact each device in the hoistway. Can be reduced. Therefore, the safety of the worker when performing maintenance / inspection work on the ceiling of the car can be improved without impairing the convenience of work.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of an elevator according to an embodiment of the present invention.
As shown in FIG. 1, in the elevator according to the embodiment of the present invention, a safety fence 2 is provided along three sides of the car upper ceiling 1a of the car 1. The safety fence 2 includes pillars 2a erected in the vicinity of the four corners of the upper ceiling of the car and handrails 2b spanning the ends of these pillars 2a in three directions.

  The worker 3 is located on the inside of the car ceiling 1a from the location where the safety fence 2 is installed, and by attaching a safety rope (not shown) wrapped around the worker's waist to the safety fence 2, A fall from the car 1 can be avoided.

  Although not shown, the car 1 is connected to the counterweight via a rope wound around a sheave provided on the motor shaft of the hoisting machine. The car 1 moves up and down in the opposite directions together with the counterweight as the sheave rotates by driving the hoisting machine.

  Further, a cable switch 4a is disposed along the outer periphery of the car upper ceiling 1a. However, the cable switch 4a is arranged avoiding the standing position of the pillar 2a of the safety fence 2 on the car ceiling 1a.

  In addition, a cable switch 4b is disposed on the inside of the upper ceiling 1a of the car from the position where the cable switch 4a is disposed. The cable switch 4a and the cable switch 4b are disposed to face each other with a predetermined interval, for example, 5 centimeters.

  The resistance values of the cable switches 4a and 4b change when pressure is applied, for example, when the operator 3 steps on the foot. FIG. 2 is a diagram showing a state in which the cable switch 4b of the elevator according to the embodiment of the present invention is stepped on with the feet of the worker 3. Specifically, the resistance value of the cable switch 4b to which pressure is applied is lower than the resistance value of the cable switch 4b to which pressure is not applied.

  The cable switches 4a and 4b are connected to the detection circuit 5. The detection circuit 5 detects this when the resistance value of the cable switch 4a changes. Moreover, the detection circuit 5 detects this when the resistance value of the cable switch 4b changes.

  The detection circuit 5 is connected to the alarm signal processing unit 6 and the elevator control panel 7. The installation location of the detection circuit 5, the alarm signal processing unit 6, and the elevator control panel 7 is not particularly limited, and each may be connected via a signal line or a tail cord.

  An alarm device 8 is provided on the car ceiling 1a. The alarm device 8 is connected to the alarm signal processing unit 6. The alarm device 8 is provided with a speaker (not shown). The alarm device 8 emits, for example, a buzzer sound or a chime sound from the speaker in accordance with an instruction from the alarm signal processing unit 6. Further, the elevator control panel 7 controls the raising / lowering operation of the car 1 in accordance with an instruction from the detection circuit 5.

  There are two types of operation modes of the car 1, a normal operation mode and an inspection operation mode. The normal operation mode is an operation mode in which the car 1 is moved up and down according to call registration. The inspection operation mode is an operation mode in which the car 1 is manually moved up and down at a rated speed that is lower than the rated speed in the normal operation mode.

  An operating device (not shown) for switching the operation mode of the car 1 is provided inside the car 1. This operating device is connected to the elevator control panel 7. When this operator is operated by an operator, a control signal for instructing to set the operation mode of the car 1 to either the normal operation mode or the inspection operation mode is sent from the operator to the elevator according to the operation state. It is output to the control panel 7. The elevator control panel 7 sets the operation mode instructed by the control signal from the operating device, and controls the driving of the hoist according to the set mode.

  The elevator control panel 7 outputs a signal indicating the type of the currently set operation mode to the detection circuit 5. In the detection circuit 5, when the type of operation mode indicated by the signal from the elevator control panel 7 is the inspection operation mode, the alarm device 8 issues an alarm according to the change in the resistance value of the cable switches 4 a and 4 b. A control signal for instructing whether or not is output to the alarm signal processing unit 6.

  Further, when the type of operation mode indicated by the signal from the elevator control panel 7 is the inspection operation mode, the detection circuit 5 performs the raising / lowering operation of the car 1 according to the change in the resistance value of the cable switch 4a. A control signal for instructing the presence or absence is output to the elevator control panel 7.

Hereinafter, the processing operation of each device when pressure is applied to the cable switches 4a and 4b of the elevator according to the embodiment of the present invention will be described.
In the initial state, it is assumed that no pressure is applied to the cable switches 4a and 4b, and the operation mode of the car 1 is set to the inspection operation mode.

  In this state, when the worker 3 approaches the end of the car upper ceiling 1a and steps on the cable switch 4b with his / her foot (see FIG. 2) to apply pressure to the cable switch 4b, the resistance value of the cable switch 4b is reached. Becomes lower. When detecting that the resistance value of the cable switch 4b has become low, the detection circuit 5 outputs a control signal for instructing the alarm device 8 (see FIG. 1) to issue an alarm to the alarm signal processing unit 6.

  When the control signal from the detection circuit 5 is input, the alarm signal processing unit 6 outputs the control signal to the alarm device 8. The alarm device 8 issues an alarm when a control signal from the alarm signal processing unit 6 is input.

  Further, when the pressure of the cable switch 4b is not applied due to, for example, the operator 3 moving away from the cable switch 4b, the resistance value of the cable switch 4b increases. When the detection circuit 5 detects that the resistance value of the cable switch 4b has increased, the detection circuit 5 outputs an alarm release signal for instructing release of the alarm issued by the alarm device 8 to the alarm signal processing unit 6.

  The alarm signal processing unit 6 outputs an alarm release signal to the alarm device 8 when the alarm release signal from the detection circuit 5 is input. The alarm device 8 cancels the alarm when the alarm cancel signal from the alarm signal processing unit 6 is input.

  By performing such processing, if the worker 3 recognizes the alarm from the alarm device 8 and takes care not to move from the currently standing position toward the end of the car upper ceiling 1a, the car upper ceiling It is possible to prevent a part of the body of the worker 3 from protruding from the end of 1a. Therefore, it is possible to prevent a part of the body of the worker 3 from contacting each device in the hoistway.

  As described above, when the worker 3 steps on the cable switch 4b, an alarm is generated. However, despite this alarm being issued, the worker 3 loses balance, and the worker moves to the ceiling of the car. In some cases, the cable switch 4b moves to the outside of the cable switch 4b in 1a or moves outside the cable switch 4b without stepping on the cable switch 4b because the worker 3 has a large step length. is there.

  As described above, when the worker 3 steps on the cable switch 4a and the cable switch 4b with the same foot, or straddles the cable switch 4b with the foot, the pressure is applied to the cable switch 4a. The resistance value of the cable switch 4a is lowered. When detecting that the resistance value of the cable switch 4a is low, the detection circuit 5 instructs the alarm device 8 to issue an alarm in the same manner as when detecting that the resistance value of the cable switch 4b is low. A control signal for instructing the forced stop of the raising / lowering operation of the car 1 is output to the elevator control panel 7.

  When the control signal from the detection circuit 5 is input, the alarm signal processing unit 6 outputs the control signal to the alarm device 8. The alarm device 8 issues an alarm when a control signal from the alarm signal processing unit 6 is input. Moreover, when the control signal from the detection circuit 5 is input, the elevator control panel 7 controls the driving of the hoisting machine so that the lifting / lowering operation of the car 1 is stopped. When this control is performed, no one can raise or lower the car 1 manually.

  Then, if the pressure of the cable switch 4a is not applied due to, for example, the operator 3 leaving the cable switch 4a, the resistance value of the cable switch 4a increases. When detecting that the resistance value of the cable switch 4a has increased, the detection circuit 5 instructs the cancellation of the alarm issued by the alarm device 8 in the same manner as when detecting that the resistance value of the cable switch 4b has increased. For this purpose, a warning canceling signal is output to the warning signal processing unit 6, and a canceling signal for instructing resumption of the lifting / lowering operation of the car 1 is output to the elevator control panel 7.

  The alarm signal processing unit 6 outputs an alarm release signal to the alarm device 8 when the alarm release signal from the detection circuit 5 is input. The alarm device 8 cancels the alarm when the alarm cancel signal from the alarm signal processing unit 6 is input. Moreover, the elevator control board 7 will cancel | release stop of the raising / lowering operation | movement of the passenger car 1, if the cancellation | release signal from the detection circuit 5 is input. Any person can manually raise and lower the car 1 by releasing the stop of the raising and lowering operation of the car 1.

  If such a process is performed, when it is recognized that a part of the body of the worker 3 protrudes from the end of the car upper ceiling 1a, the car upper ceiling 1a from the position where the worker 3 is currently located. Can be encouraged to move inward. Moreover, since the raising / lowering operation | movement of the cage | basket | car 1 is controlled in addition to the warning from the warning device 8, the danger that a part of the worker's 3 body will contact each apparatus in a hoistway can be reduced.

  As described above, in the elevator according to the embodiment of the present invention, when the pressure is applied to the cable switch 4b inside the car upper ceiling 1a, the elevator 1 moves up and down while issuing an alarm by the alarm device 8. Therefore, the operation is performed so that the worker 3 does not move toward the end of the car upper ceiling 1a from the currently standing position without stopping the raising / lowering operation of the car 1 unnecessarily. It is possible to prompt member 3.

  In addition, when pressure is applied to the cable switch 4a outside the car upper ceiling 1a, the alarm device 8 gives an alarm while controlling the elevator 1 to stop the raising / lowering operation. Even if a part of the body of the worker 3 protrudes from the end of the car upper ceiling 1a due to breakage or the like, the risk of the part of the protruding body contacting each device in the hoistway is reduced. can do. Therefore, the safety of the worker when performing maintenance / inspection work on the ceiling of the car can be improved without impairing the convenience of work.

  In the embodiment described above, the alarm device 8 is configured to emit a buzzer sound or a chime sound as an alarm, but is not limited thereto, and may be configured to output a predetermined message sound, for example. Further, the alarm device 8 may be a device instead of a device that emits sound, for example, illumination such as a rotation warning light or a flashing light. If the warning device 8 is a device that does not emit sound, it is possible to prevent the passengers near the landing from feeling uncomfortable.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block diagram which shows the structural example of the elevator according to embodiment of this invention. The figure which shows a mode that the cable switch of the elevator according to embodiment of this invention was stepped on with the foot of the operator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Ride car, 1a ... Car ceiling, 2 ... Safety fence, 3 ... Worker, 4a, 4b ... Cable switch, 5 ... Detection circuit, 6 ... Alarm signal processing part, 7 ... Elevator control panel, 8 ... Alarm device .

Claims (4)

A first cable switch disposed on the ceiling of the car;
A second cable switch disposed on an inner side of the first cable switch on the upper ceiling of the car;
Alarm means for issuing an alarm when pressure is applied to the second cable switch during the raising / lowering operation of the car;
An elevator comprising: control means for controlling the raising / lowering operation of the car when pressure is applied to the first cable switch during the raising / lowering operation of the car. The elevator according to claim 1, wherein the first cable switch is disposed in the vicinity of an outer periphery of the ceiling above the car. 2. The elevator according to claim 1, wherein the second cable switch is disposed to face the first cable switch at a predetermined interval. 2. The elevator according to claim 1, wherein the control unit performs a control to stop the raising / lowering operation of the car.

Images