JPH06227781A - Door safety device for elevator - Google Patents

Abstract

PURPOSE:To provide a door safety device for an elevator to improve safety by a method wherein it is detected that a fine rope or a string is nipped between the door closing ends of a car door or it is previously detected that it is about to be nipped therebetween to stop closing of the door and be transferred to opening operation or opening waiting operation. CONSTITUTION:A first detecting device 15 using photoelectric tubes 17A and 17B where respective optical axes 18 are aligned is arranged between the upper part of the entrance of a car body 1A and a sill 10. Second detecting part 21 are arranged to the vicinity and the upper and lower parts of the door stopper surface of a door 12A. The second detecting device 21 comprises safety shoes 23 protruded at the vicinity of door closing ends during closing operation of the doors 12A and 12B; and a microswitch 25 operated when a fine rope or a string is hooked at the safety shoes 23 and designed to transmit a signal by means of which a door opening closing device is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator, and more particularly to improvement of a door safety device.

[0002]

2. Description of the Related Art Conventionally, elevator door safety devices have been mainly intended for those with a relatively large number of users and carry-in items.
It is detected that this is caught in the door or is caught, and the closing operation of the door is reversed to the stop operation or the opening operation. It is provided in order to prevent serious accidents such as the start of descent).

[0003]

However, when a thin rope, a string, or the like is caught, it cannot be detected and appropriate measures cannot be taken. Therefore, for example, if a passenger with a string-shaped object or a child with a jump rope is caught in the elevator door that closes the string-shaped object when getting off the car, the string is Since it cannot detect that it has been caught, the elevator starts running,
The string is pulled by the car of the elevator that has run, which poses a danger to the user.

Therefore, an object of the present invention is to detect in advance that a thin rope, a string, or the like is caught or caught at the door closed end of the car door, and opens the car door or waits for the car door to open. It is to provide an elevator door safety device with further improved safety by shifting to (4).

[0005]

According to a first aspect of the present invention, when a foreign object is detected, the signal is retracted by protruding near the door contact surface of the upper and lower portions of the elevator car door and near the door closed end. It is provided with a detection device provided with a detection body for transmitting.

According to a second aspect of the present invention, there is provided a plurality of photocells in which optical axes in the vertical direction are arranged near the door closed end along the opening / closing direction at the front of the elevator car door. And a second detection device having a detection body that protrudes in the vicinity of the door closing surface of the car door and that retracts and transmits a signal when a foreign substance is detected, when a foreign object is detected.

Further, the invention according to claim 3 has a plurality of photoelectric tubes in which optical axes in the vertical direction are arranged near the door closed end along the opening / closing direction at the front of the elevator car door. A first detection device and a detection body that projects near the front end of a movable body that is provided near the door contact surface of the car door and that retracts when a foreign object is detected near the door closed end, and transmits a signal. And a second detection device having.

[0008]

According to the invention described in claim 1, when a thin rope or string-like foreign matter crosses the entrance / exit of the elevator, it can be detected by the detector protruding in the vicinity of the closed end of the elevator car. The closing operation of the car can be stopped or the traveling of the car can be stopped.

According to the second aspect of the present invention, since the optical axes in the vertical direction are arranged by the photocells, foreign matter such as thin ropes or cords near the door closed end and the door contact position is the entrance / exit of the elevator. It can be detected when the vehicle crosses over and the closing operation of the car door can be stopped. Even if the foreign matter cannot be detected by the first detection device, the detection body of the second detection device projects near the closed end of the door, so that it can be detected that the foreign matter is sandwiched by the detection body. It is possible to stop the closing operation of the door or stop the traveling of the car.

According to the third aspect of the present invention, since a plurality of vertical optical axes are arranged by the photocells, foreign matter such as thin ropes or cords near the door closed end or the door contact position may cause the elevator to move. When it crosses the doorway, this can be detected and the closing operation of the car door can be stopped. Even if the foreign matter cannot be detected by the first detection device, the detection body of the second detection device projects, so that it is possible to detect that the foreign matter is sandwiched by the detection body, and the car door is closed. You can stop or stop driving the car.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention, (a) is a front view and (b) is a side view. In the figure, 1A is a car body, a sill 10 is attached to the lower front side of the car body 1A, and a guide rail is provided above the doorway of the car body 1A.
11 is installed. Reference numerals 12A and 12B are double-opened car doors, the upper portions of which are supported by guide rails 11 via suspension devices (not shown), and the lower portions of which are guided by guide grooves 14 of the sill 10 via door guide shoes 13. , Basket 1
It is opened / closed by a door opening / closing drive device (not shown) attached to A.

A first detection device 15 is attached to the car body 1A. The first detection device 15 includes a phototube 17A on the light emitting side that is attached via a support frame 16 above the entrance and exit of the car body 1A, and a phototube 17B on the light receiving side that is attached to the sill 10.
And the optical axis 18 is at the center of the entrance / exit of the car body 1A,
The car doors 12A and 12B are arranged so as to be located near the door closed ends and the door contact portions and in front of the car doors 12A and 12B.
Here, the threshold 10a is provided in the threshold 10 so that light can pass therethrough.
Is provided, and a cover 19 made of a glass material is attached to the opening 10a.

At the lower ends of the door contact portions of the car doors 12A and 12B, as shown in FIGS. 2 (a) and 2 (b), the protrusions extend into the guide grooves 14 of the sill 10 and form a slight gap. 20 are provided. A second detector 21 is attached to the car doors 12A and 12B.

The second detection device 21 is disposed inside the car door 12A, and has a safety device 23 rotatably attached via a shaft 22 as shown in FIGS. 3 (a) and 3 (b). , A return spring 24 that always returns the safeguard 23 to the inside of the car door 12A, a micro switch 25 that detects the displacement of the safeguard 23, and the safeguard 23 is regulated from being displaced more than a predetermined amount. Stopper 26, a permanent magnet 27A attached to the upper end of the safety 23, and a permanent magnet 27B attached to the door-contact surface of the car door 12B so that the same poles as the position of the permanent magnet 27A face each other.
It is composed of. Here, the cage door 12A has a permanent magnet.
An opening 28 having an area slightly larger than the area of the permanent magnet 27A is formed on the door contact surface facing 27A.
An opening 29 is formed in the lower part of the car to allow the safetish 23 to rotate toward the car door 12B. Basket door
12B also has an opening 30 formed in the door-contact surface so that the safety 23 can rotate toward the car door 12B. These openings 29 and 30 are formed so that the gap formed between them and the safe tissue 23 is small. In addition, the safetish 23 is formed so that the lower part is wider than the upper part, and the lower surface of the safetish 23 is formed by the shaft 22.
It should be arcuate so that it does not interfere with the rotation around. The second detection device 21 having the above configuration is also attached to the upper part of the car door 12A.

Next, the operation of the embodiment configured as described above will be described. When the car doors 12A and 12B are driven by a door opening / closing drive device (not shown) to perform a closing operation as shown by an arrow in FIG. 3, a thin rope or string (not shown) held by the child is dragged. Then, this thin rope or string is pulled toward the center of the doorway by the door stop surface.
At this time, since the optical axis 18 of the first detection device 15 is blocked, the door opening / closing drive device (not shown) is controlled by the signal at this time to stop the closing operation of the car doors 12A, 12B, and open or open. Shift to standby operation. Therefore, if you pull out a thin rope or string (not shown) so as not to block the optical axis 18, the door opening and closing device (not shown) will be driven again, and the car door
12A and 12B are closed, and the car 1 starts running after the closing operation is completed. The first detection device 15 includes the car doors 12A and 12A.
Since the function is lost at the door closed end of B, the car doors 12A and 12B are not detected.

Further, since the first detecting device 15 loses its function at the door closed end, it cannot detect when a thin rope or cord is at the door closed end. However, in this case the car doors 12A, 12
When B continues to close and the door stop surface approaches, the permanent magnet
The safe force 23 is shown in FIG.
It rotates as shown by the broken line and projects from the door contact surface. Therefore, if a thin rope or cord is dragged, it will be caught in the protruding safety mesh 23,
Since 23 is pushed into the car door 13A side, the micro switch 25 operates to control the door opening / closing device (not shown),
The closing operation of the car doors 12A and 12B is stopped, and the operation moves to the opening operation or the opening standby operation. Therefore, if the thin rope or cord is pulled out in the same manner as described above, the safety 23 will be
Since the opening 29 is formed on the door contact surface of B, it is a stopper.
The micro switch 25 is made inoperative by rotating it to the position regulated by 26, the door opening / closing device (not shown) is driven again, and the car doors 12A and 12B are closed, and the car 1 after the closing operation is completed. Starts running.

Therefore, according to the embodiment configured as described above, when a child or the like gets out of the car while dragging a thin rope or string, a part of the thin rope or string remains in the car. Also, regardless of the height of this thin rope or string, its presence is detected by blocking the optical axis of the first detection device, and the door opening / closing device is controlled by that signal to stop the closing operation of the car door, Since the operation shifts to the opening operation or the opening standby operation, no accident will occur even if the user descends while dragging a fine rope or string. Even if the first detecting device cannot detect the presence of the thin rope or the string at the closed end of the door, the presence of the second detecting device can surely detect the presence of the thin rope or the string. No accident caused by getting off while. Since the safetish is rotated at the closed end of the door by utilizing the repulsive force of the permanent magnet, the structure is simple and can be reliably operated.

On the other hand, since the opening is provided in the threshold to allow the optical axis to pass therethrough, the photoelectric tube can be constructed compactly without traveling to the outside of the car, and a transparent cover is attached to the opening. Therefore, dust or the like does not adhere to the phototube and impair the function of the phototube. Further, since the protruding portion extending to the guide groove of the sill is provided at the lower end of the door contact surface of the car door, a thin rope or cord is not caught between the car door and the sill. Furthermore, since the clearance between the safetish and the opening formed in the car door is small, a thin rope or string does not pass between the safetish and the car door and bypass the safetish.

The present invention is not limited to the above-described embodiments, but can be modified in various ways. FIG. 4 is a rear view showing another embodiment of the present invention. In the figure, 31
A and 31B are car doors, and the car doors 31A and 31B are provided with mechanical safety devices 32A and 32B near the door contact surfaces, respectively, as in the conventional case. These safeties 32A and 32B have the same structure and are attached to the car doors 31A and 31B in the vicinity of the door contact surfaces so as to be movable back and forth through rotatable links 33 and 34, respectively. The car door 31A is positioned so as to project more appropriately.
In order to avoid mutual interference at the closed ends of the doors 31 and 31B, cam mechanisms 35A and 35B (however, 35B is not shown) are engaged with the link 34. In addition, safe tissue 32A, 32
B has a U-shaped cross section. Further, the safe detection 32A is provided with second detecting devices 36, 36 having the same structure at the upper and lower parts (however, the second detecting devices 36, 36 are mounted opposite to each other).

As shown in FIG. 5, the second detecting device 36 is rotatably attached to the safety 32A via a shaft 37, and the door contact surface side of the car door 31B is a straight surface 38a, and the opposite side is the other side. Engaging surface 38b formed from two arc surfaces, shaft 38 on the upper side
Is a circular arc surface 38c centered on the center, a return spring 39 that acts to return the safetish 38 to the car door 31A side, and a car door 31A that is substantially horizontal and rotates via a shaft 40. A lever 41 that is freely attached and has a semicircular tip that engages with the engagement surface 38b of the safety 38 so that the straight surface 38a protrudes from the door-contact surface while pushing up the safety 38. A return spring 42 that constantly pushes the tip of the lever 41 upward and a micro switch 43 that engages with the lever 41 and detects the displacement of the safeguard 38 are formed. Openings 44 and 45 are formed in the safeties 32A and 32B, respectively, to allow the safeties 38 to rotate and to project the straight surface 38a side from the door contact surface. Here, the gap formed by the openings 44 and 45 and the safe tissue 38 is made small. Although not shown, a third detection device using a photoelectric tube having the same configuration as the first detection device in the above-described embodiment is attached to the car body and the threshold.

Next, the operation of another embodiment configured as described above will be described. The operation of the third detection device is similar to that of the first detection device of the above-described embodiment. Further, the second detection device 36 moves backward together with the safety 32A that moves backward near the door closed end in the closing operation of the car doors 31A and 31B. However, since the lever 41 does not move backward, the safety 38 is relatively pressed by the lever 41 and pivots so that the upper part thereof projects from the door-contact surface as shown by the solid line in FIG. This rotation is due to the openings formed in the safeties 32A and 32B.
It is done by 44, 45 without any trouble.

Similar to the above-mentioned embodiment, a thin rope or string is dragged, and even if this cannot be detected by the third detecting device, it catches on the safe tissue 38, whereby the safe tissue 38 is pushed back. It rotates as shown by the broken line in FIG. The lever 41 also rotates counterclockwise about the shaft 40 as shown by the broken line. By this rotation of the lever 41, the micro switch 43 is returned, and the door opening / closing drive device (not shown) is controlled by this signal, and the car door 31
Stop the closing operation of A and 31B, and shift to the opening operation or the opening standby operation. Then, when the thin rope or string is pulled out, the safety 38 is pushed out by the lever 41 and rotated,
Since the micro switch 43 operates, the door opening / closing device (not shown) is controlled by this signal, and the car door 31A,
Close 31B. After the closing operation is completed, the car starts traveling. Therefore, the other embodiments configured as described above also operate reliably under all conditions. Further, since the clearance at the portion where the safetish passes is small, a thin rope or cord does not bypass the safetish.

[0023]

As described above, according to the present invention, a plurality of photoelectric tubes are arranged so that the optical axes in the vertical direction are arranged near the door closed end along the opening / closing direction at the front of the elevator car door. And a second detector having a detector that projects near the door contact surface of the car door and retracts to emit a signal when a foreign object is detected near the door closed end and detects a foreign matter. Therefore, it is necessary to detect that a foreign object such as a thin rope or string is caught or caught at the door closed end, stop the car door closing operation, and perform the opening operation or the car door open standby operation. As a result, it is possible to provide an elevator door safety device with further improved safety.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a front view,
(B) is a side view.

2A and 2B show a main part of an embodiment of the present invention, in which FIG. 2A is a front view and FIG. 2B is a side view.

3A and 3B show a main part of one embodiment of the present invention, FIG. 3A is a front view, and FIG. 3B is a sectional view taken along line AA of FIG.

FIG. 4 is a rear view showing another embodiment of the present invention.

5A and 5B show essential parts of another embodiment of the present invention, wherein FIG. 5A is a rear view and FIG. 5B is a view taken along the line BB of FIG.

[Explanation of symbols]

1 ... basket, 3 ... thin rope or string, 10 ... threshold, 12A,
12B, 31A, 31B ... Car door, 15 ... First detection device, 17
A, 17B ... Phototube, 18 ... Optical axis, 20 ... Projection part, 21, 36 ... Second detection device, 23, 32A, 32B, 38 ... Safe tissue,
25, 43 ... Micro switch, 27A, 27B ... Permanent magnet, 41
…lever.

Claims (3)

[Claims] 1. A detection device is provided, which is provided near the door contact surfaces of the upper and lower portions of a car door of an elevator, and which is provided with a detection body that projects near the door closed end and retracts when a foreign object is detected and transmits a signal. An elevator door safety device characterized in that 2. A first detection device having a plurality of photoelectric tubes in which optical axes in the vertical direction are arranged near the door closed end along the opening / closing direction at the front of the elevator car door, and the car. A door safety device for an elevator, comprising: a second detection device having a detection body that protrudes near a door closing end and retracts and transmits a signal when a foreign substance is detected, near the door contact surface of the door. . 3. A first detector having a photoelectric tube in which a vertical optical axis is arranged near the door closed end along the opening / closing direction at the front of the elevator car door, and the car door. A second detection device is provided near the front end of a movable body that is provided in the vicinity of the door contact surface and near the front end of the movable body. The second detection device has a detection body that projects near the door closed end and retracts to emit a signal when a foreign substance is detected. Elevator door safety device characterized by