JPS63134483A - Safety device for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a safety device during maintenance and inspection work at the bottom of a hoistway.

(Prior Art) In recent years, elevators for private residences have become popular as a measure for the elderly and the disabled, or for high-rise buildings such as three- and four-story buildings.

This type of elevator is generally characterized by its small size, low speed, and space saving, and the drive method is basement type,
A winding barrel type is suitable. Conventionally, in order to save space, the machine room was eliminated and the drum type drive device and control device were installed at the bottom of the hoistway, that is, in the pit.

Therefore, when inspecting an elevator in which the single-cylinder drive device and control device are provided at the bottom of the hoistway, a worker must enter the bottom of the hoistway.

(Problem to be solved by the invention) When working in a narrow and shallow pit where many types of equipment are installed, when the worker is in an upright position, there is a danger to the worker if the car comes down. expensive.

The purpose of the present invention is to forcibly stop the descent of the elevator at a position above the worker's head where safety can be ensured, in order to ensure the safety of the worker when the worker is at the bottom of the hoistway. The purpose is to provide elevator safety equipment.

[Structure of the invention]

(Means for solving the problem) In an elevator with a hoist installed at the bottom of the hoistway,
A first detection means for detecting the presence of a person at the bottom of the hoistway, a second detection means for detecting a predetermined position of the car, and a first detection means for detecting the presence of a person at the bottom of the hoistway.
A stop control means is provided which inputs signals from the second detection means and the second detection means and stops the operation of the car based on the signals from both.

(Function) When the first detection means detects the presence of a person at the bottom of the hoistway, it outputs a detection signal to the stop control means. On the other hand, the second detection means outputs a position detection signal to the stop control means when the car reaches a predetermined position. This stop control means stops the operation of the car when a detection signal for detecting a person and a position detection signal are input.

(Example) An example based on the present invention will be described using the drawings. 1st
The figure shows a vertical cross-section of the hoistway of a private residential elevator, with a worker at the bottom of the hoistway. A shock absorber and speed governor are also installed, but they are not shown. A lobe 4, one end of which is fixed to the upper part of a heel 3 in a hoistway 2 provided in a house 1, is connected via a top sheave 5 to a hoist 6 provided at the bottom of the hoistway (hereinafter referred to as a pit). It is wound around the winding drum 7 of.

As the winding drum 7 rotates, the car moves up and down. 8 is an elevator control device, 9 is a cam provided on the car, 10 is a forced stop limit switch which is the second detection means, 11
is the terminal floor braking limit switch.

In addition, 12 is a retractable step, which can be stored by folding it against the wall during normal operation, and can be folded down during inspection work as shown in the figure to serve as an auxiliary staircase when entering the pit. It can be used for both purposes. A safety switch 13 is provided on the wall of the pit and is activated when the step 12 is retracted toward the wall. This safety switch 13 acts as a first detection means. 14 is a worker who is working on the hoisting machine 6 in the pit. When inspecting the control device 8, the operator enters the pit and performs the work.

Next, a stop control circuit for disabling the operation of the car by operating the safety switch 13 will be described with reference to the drawings. Second
The figure shows a circuit diagram of the stop control circuit.

10b is a normally closed contact of the forced stop limit switch 10. llb is a normally closed contact of the terminal floor braking limit switch 11. Further, 13a is a contact that is linked to the safety switch 13, and is a contact that opens when the safety switch 13 is turned off and closes when the safety switch 13 is turned on. 15 is a descending operation relay.

By operating this descending operation relay 15, a descending operation command is given to the control device 8. Contact 11b and contact 1
0b and the descending operation relay 15 are connected in series, and the contact 10b
Contacts 13a are connected in parallel to each other.

The operation of the elevator safety device with the above configuration will be explained. When the worker 2o enters the pit, he first drives the car 3 to the upper floor and then opens the landing door 16 on the lowest floor. This brings the heel 3 into a stopped state. Next, from the landing side, fold down the retractable step 12 horizontally as shown. This allows the worker 20 to easily enter the pit using the retractable step 12. After the work tool 20 enters the pit, an inspection switch (not shown) provided in the control device W8 is turned on, and the handle 3 is manually operated.
Check and drive. Also, the hoisting machine in the pit6. Control device 8
, the speed governor (not shown), or the heel 3.

On the other hand, when the retractable step 12 is laid down horizontally, the safety internal switch 13 is activated and turned off. When the safety switch 13 is turned off, the contact 13a opens. Therefore, the descending operation relay 15, the contact 10b of the forced stop limit switch 10 provided in the hoistway 2 and activated by the cam 9 of the car 3, and the terminal floor braking limit switch Ilb are connected. Configure a series circuit. If it starts operating downward, first press the forced stop limit switch lO.
is activated, and the descending operation relay 15 is immediately turned off. Therefore, the car 3 stops its downward operation, the electromagnetic brake is activated, and the car 3 is forcibly stopped after a short distance.

As a result of the above, the heel 3 always comes to a stop at a height H above the bottom of the hoistway, and a safe distance can be maintained above the worker's head. Note that a locking device may be provided for the retractable step to prevent it from returning to the wall side by mistake.

Now, when the worker 20 has completed his work in the pit, he uses the step 12 as a stepping stone to go out to the landing and return the step 12 to its original position. As a result, the contact 13a is closed and the forced stop limit switch 10a and the contact 10b are short-circuited and become invalid, allowing the car to descend to the lowest floor. Note that the contact point 11b becomes effective during inspection operation on the car or during normal operation.

As described above, the safety above the worker 20 can be ensured when inspecting and driving the car in the pit. Another embodiment is shown in FIGS. 3 and 4 when the step 12, which assists when entering the pit, is knocked down. In Figure 3, a mud switch 10 is installed on the floor of the pit, especially in the area where workers move. The mud switch 16 may be a commercially available one modified as appropriate, and the output may be turned on by the load of a worker if there is a worker on any part of the mat. Figure 4 is a circuit diagram in this case. When the mud switch 10 is turned on, the detection relay 17 connected to it operates and the contact 17b opens, so the limit switch 10b becomes effective and the second
It is equivalent to the figure. According to this embodiment, mistakes such as forgetting to take out the step 12 can be prevented, and safety is ensured as long as the worker 20 is in the pit.

Further, other embodiments are shown in FIGS. 5 and 6. In this embodiment, an illuminating light 18 is added to the embodiment shown in FIG. 1. When the step 12 is laid down horizontally, the safety switch 13 is activated, and when the other contact 13b is closed, the illuminating light 18 is turned on. It was designed so that According to this embodiment,
Since the pit lighting is performed automatically, work efficiency is not only improved, but also has the effect of notifying the work tool 2o that the safety switch 13 is in operation. It is also effective against forgetting to return step 12 when escaping from the pit. Still other embodiments are shown in FIGS. 7 and 8. This example uses a photoelectric sensor 19.20°2 to detect workers in the pit.
1 is arranged, and if any of the light beams is cut off during work, one of its output contacts 19b, 20b, and 21b will open, producing the same effect as described above. The number of photoelectric sensors may be selected as appropriate, and may be modified as long as it is capable of detecting a human body, such as an ultrasonic sensor, a radio wave sensor, or a far-infrared heat-sensitive sensor. The embodiment described above shows the case where the pit is entered from the bottom floor landing door, but the 9th floor
In some cases, entrance and exit is done through a separate hatch as shown in the diagram.
In this case, when the hatch door 22 is opened, the safety switch 2
3 is set to operate, the configuration can be similar to that shown in FIG. 1.

〔Effect of the invention〕

As explained above, according to the present invention, when a worker enters the pit at the bottom of the hoistway to work, the work safety device automatically activates and uses its output to control the elevator's descent by a predetermined distance from the bottom of the hoistway. The safety of the worker's head can be ensured by securing it and forcibly stopping it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an elevator safety device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a stop control circuit used in an elevator safety device according to an embodiment of the present invention, and FIG. 4, 5, 6, 7, 8 and 9 show other embodiments according to the invention. 6...Hoisting machine 13...Safety switch 1
6...Mud switch 14...Descent operation relay agent Patent attorney Nori Chika Yudo Hirofumi Mitsumata

Claims (1)

[Scope of Claims] In an elevator with a hoist installed at the bottom of the hoistway, the first detection means outputs a signal when the presence of a person is detected at the bottom of the hoistway, and when the car reaches a predetermined position. a second detection means for outputting a position detection signal to the first detection means; and a stop control means for stopping the operation of the car when the detection signal from the first detection means and the position detection signal from the second detection means are input. An elevator safety device characterized by the following: