JPS5917719B2 - Automatic door safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for automatic doors installed at elevator entrances and the like.

First, the automatic door device will be explained with reference to FIG.

In the figure, 1 is the elevator car, 2 is the entrance/exit of this, and 3
1 is a sliding door that opens and closes the entrance/exit 2; 4 is a drive machine provided on the car 1; 5 is a first guide wheel provided on the car 1 and consisting of a chain gear driven by the drive machine 4 via a V-belt; 6 is a first guide wheel A second guide wheel consisting of a chain gear located apart from the first guide wheel 5
The guide wheel 7 is an endless flexible strip made of a roller chain wound around the first and second guide wheels 5 and 6, and is connected to the sliding door 3 on one side.

That is, the flexible strips γ are arranged in an endless manner, and their longitudinal ends are arranged along the travel path of the sliding door 30, and the sliding door 3 is opened/closed and driven by the driver 4 via the flexible strips 7.

However, the sliding door 3 that closes may collide with passengers passing through the entrance/exit 2, or the sliding door 3 that opens may collide with the edge of the entrance/exit 2.
There is a risk that passengers may have their hands caught between them.

The present invention aims to solve the above-mentioned drawbacks and provides a simple automatic door safety device that detects when an abnormality occurs when a sliding door is opened or closed.

Hereinafter, an example of this invention will be explained with reference to FIGS. 2 to 6.

In the figure, the same reference numerals as in FIG. 1 a displacement body pivotally supporting the guide wheel 5; 10 a biasing body consisting of a tension coil spring whose one end is connected near the rotating end of the displacement body 9 and the other end connected to the basket 1; It is pivoted to pin 8 and has pin 8 on one side.
11b is an arm protruding from a position corresponding to the braking surface 11a, and Ilc is a recess formed on the opposite arm 11b side of the movable body 11. , 12 is a detection device consisting of a switch mounted in the middle of the displacement body 9 and whose actuating part faces the arm 11b, and 13 is a connector consisting of a bolt loosely inserted through the middle part of the displacement body 9 and screwed into the arm 11b. Then, only the counterclockwise displacement of the displacement body 9 in FIG. 2 is transmitted to the arm 11b.

Reference numeral 14 denotes a brake device mounted on the car 1, and includes a brake member 14b that is pressed by a suppressor 14a disposed inside the case and impinges on the brake surface 11a.

Reference numeral 15 denotes a blocking piece for the displacement body 9 provided on the car 1.

That is, the displacement body 9 is connected to the flexible strip body 7 via the first guide wheel 5.
, and is also urged by the urging body 10, so that tension acts on the flexible strip 7.

Moreover, this tension holds the displacement body 9 in a predetermined position against the load caused by the normal opening/closing resistance of the sliding door 30.

Further, the movable body 11 is always held at a predetermined position by the brake 14, and the detection device 12 is arranged so as not to operate in this state.

In this way, in a normal state, the sliding door 3 is opened and closed without displacement of the displacement body 9 and the movable body 11.

Now, suppose that an excessive closing resistance is applied to the sliding door 3 due to the sliding door 3 colliding with a passenger, and an overload is applied to the flexible strip 7, as shown in FIG. striation 7
The upper side becomes loose, and the displacement body 9 is displaced clockwise against the biasing force of the biasing body 10.

On the other hand, since the movable body 11 is held at a predetermined position, the detection device 12 is pressed and operated by the displacement of the displacement body 9, and the drive unit 4 is thereby controlled in the event of an abnormality, and the sliding door 3 is stopped or reversed. It works.

Furthermore, if excessive door opening resistance acts on the sliding door 3 due to a passenger's hand getting caught between the sliding door 3 and the side edge of the door pocket of the doorway 2, as shown in FIG. Loosening occurs on the lower side of the flexible strip 7, and at this time as well, the displacement body is displaced clockwise, which causes the detection device to operate.

Further, the flexible strip 7 inevitably stretches, but in this case the displacement body 9 is displaced counterclockwise in FIG. 2.

However, at this time, the movable body 11 is displaced counterclockwise via the contact 13 and the arm 11b against the holding force of the brake tool 14.

Therefore, since no relative displacement occurs between the arm 11b and the displacement body 9, the detection device 12 does not operate.

Moreover, even if the flexible strip body 7 is stretched in this way, the arm 11b
Since the displacement body 9 is integrally displaced with respect to the car 1, if the spring constant of the biasing body 10 is made small, the operating load of the detection device 12 is kept almost constant, so that no abnormality occurs in the sliding door 3. Since the load for operating the detection device 12 does not increase when the detection device 12 is operated, safety is not compromised.

Furthermore, when the flexible strip 7 stretches abnormally or breaks, the displacement body 9 comes into contact with the blocking piece 15 and is prevented from rotating.

At this time, as shown in FIG. 6, the brake element 14b comes off the brake surface and presses the recess 11c, so that the movable body 11 is displaced relative to the displacement body 9.

This causes the detection device 12 to operate, and when the operation of the detection device 12 continues for a predetermined period of time (not shown), it is notified that the sliding door 3 cannot be opened or closed due to breakage or abnormal elongation of the flexible strip T.

In this way, when abnormal opening/closing resistance occurs in the sliding door 3, the detection device 12 is activated to detect the sliding door 3 without being affected by the elongation of the flexible strip 7, and even when the flexible strip 7 breaks. Anomaly is detected.

Note that even if the displacement body 9 in this embodiment is as described below, the function of detecting abnormal opening/closing resistance of the sliding door 3 can be obtained.

That is, the first and second guide wheels 5 and 6 are directly pivotally connected to the car 1, and are partially engaged with the flexible strip body 7 at an intermediate position between them. Even if a displacement body is placed that is biased in a direction that tensions the displacement body, a safety device that detects excessive displacement of this displacement body can be obtained.

As explained above, the present invention includes a device that opens and closes a sliding door via a stretched flexible strip, and a displacement body that is engaged with the flexible strip and is biased in the tension direction of the flexible strip. A movable body is provided, which is displaced together with the displaceable body when the flexible body is displaced in the above-mentioned tension direction, and is held in a predetermined position when the flexible body is displaced in the opposite tension direction, and does not operate when the flexible body is stretched, resulting in an abnormal opening/closing of the sliding door. The relative displacement between the displacing body and the movable body when this occurs is detected.

As a result, an inexpensive automatic door safety device is realized that can control the sliding door in an abnormal situation with a simple device configuration and without causing malfunction due to elongation of the flexible strip.

[Brief Description of the Drawings] Fig. 1 is a front view of an automatic door of an elevator, Fig. 2 is a front view showing an embodiment of the automatic door safety device according to the present invention, and Fig. 3 is a section (■) in Fig. 2. Figure 4 is an enlarged view of the ■ section in Figure 2, which explains the operation when an overload occurs on a sliding door operating in the closing direction, and Figure 5 shows the operation when an overload occurs on a sliding door operating in the opening direction. FIG. 4 is a diagram illustrating the operation when a load is applied, and FIG. 6 is a diagram corresponding to FIG. 4 illustrating the operation when the flexible strip is abnormally stretched or broken. 3... Sliding door, 5... First guide car, 6... Second guide car, 7... Flexible strip body, 9... Displaceable body, 10...
Biasing body, 12... detection device. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. A flexible strip of endless guide wheels that are wound around each other and arranged apart from each other, and a sliding door that runs along the length of the flexible strip and is engaged with the flexible strip. and the sliding door is opened and closed via the flexible strip body, the displacement body being engaged with the flexible strip body and disposed so as to be displaceable along the tensioning direction of the flexible strip body; a biasing body that engages with the displacement body and biases it in the tensioning direction of the flexible strip body; and when engaged with the displacement body and the displacement body is displaced in the tensioning direction, together with the displacement body; A movable body that is displaced, a braking tool that brakes the movable body and stops the displacement of the movable body when the displacement body is displaced in the opposite tension direction, and a brake that brakes the movable body when the displacement body and the movable body are displaced relative to each other. An automatic door safety device comprising: an operating detection device;