JPH0593485A - Automatic opening and closing device for door - Google Patents

Abstract

PURPOSE:To raise the keeping efficiency of closed condition of door as well as safety of door and exact opening and closing operation of door by simplifying the constitution and by reducing the cost for existing doors of outside attachment type. CONSTITUTION:A wire rope 24 engaged to pulleys 11 and 12 supported on both sides of a framework 1 is connected through tension springs 25 and 26 to d ball bearing 2. The pulley 11 is turned to optional directions through a reduction gear mechanism 14 by a motor 13, and the wire rope 24 is moved to move the ball bearing 20, whereby permitting the door to open or close through a link 22. Abrupt change of load is detected by a potensiometer 27 to stop the operation of the motor 13. The ball bearing 20 is always pressed to the direction of closing the door by a constant load spring 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door opening / closing device used for automatically opening and closing various types of doors such as swing type (single opening, double opening) and slide type doors at entrances, toilets, office reception rooms and the like. Regarding

[0002]

2. Description of the Related Art Conventionally, for example, as an automatic door opening / closing device which can be externally attached to a swing type door, a rotary shaft is rotatably supported by a frame, and a pair of link mechanisms are attached to the rotary shaft. A configuration is known in which one end is connected and a drive source for rotating the rotating shaft is housed in a frame.

In the above automatic door opening / closing device, the frame body and the other end of the link mechanism are selectively connected to the fixed portion and the door. Then, by operating the switch to drive the drive source to rotate the rotating shaft in one direction, the door can be rotated and opened via the link mechanism, and then the drive source is driven in the opposite direction to rotate. By rotating the shaft in the reverse direction, the door can be rotated in the reverse direction and closed via the link mechanism.

[0004]

However, in the structure of the conventional example as described above, since the rotational force of the rotary shaft is directly transmitted to the link mechanism to open and close the door, a large load is applied to the rotary shaft. For this reason, it is necessary to use a material and structure having excellent strength for the rotating shaft and its supporting portion, and a large driving force is required for the driving source, which is expensive. Also,
In the mechanism that opens and closes the door by directly transmitting the rotational force of the rotating shaft to the link mechanism as described above, the weight of the door that can be opened and closed is limited by itself, and it should be applied to existing heavy doors. There was a problem such as not being able to.

The present invention solves the above-mentioned problems of the prior art and can be applied to an existing door as an external type, and simplifies the structure to reduce the cost. In addition, even a heavy door can be opened and closed with certainty, and moreover, the door can be opened and closed reliably, the door can be maintained in a tightly closed state, and the safety can be improved. It is an object of the present invention to provide an opening / closing device, and in addition to the above object, an object of the present invention is to provide an automatic door opening / closing device capable of preventing damage and improving durability. In addition, it is an object of the present invention to provide an automatic door opening / closing device capable of controlling the door to an arbitrary opening / closing speed and an opening / closing position and thus improving the operability of the door. In addition to , The door can be automatically closed or opened when the operation is stopped due to a failure of the drive source, etc., and the door can be manually operated in the opposite direction. Therefore, it is possible to improve safety in the event of a failure. It is an object of the present invention to provide an automatic door opening / closing device capable of performing.

[0006]

The technical solution of the present invention for achieving the above object is a frame body, and first and second rotating bodies rotatably provided on both sides of the frame body. When,
A drive source linked to the first rotating body; a movable body supported by the frame body so as to be movable between the rotating bodies;
And a movable body that is hung on the second rotary body and is connected to the movable body so as to form an endless shape, travels with the rotation of the first rotary body, and moves the movable body, and the movable body. An operating member having an inner end connected to the body, and a tension applying means for applying tension to the traveling body and capable of slipping the traveling body on the first rotating body when a sudden load change occurs. The outer ends of the frame and the operating member are selectively attached to the fixed portion and the door.

Alternatively, the above technical means is provided with a detecting means for detecting a sudden load change and stopping the driving of the drive source.

Alternatively, each of the above technical means is provided with a detecting means for detecting the traveling position of the movable body and controlling the drive source.

Further, in each of the above technical means, there is provided a means for constantly applying a load to the movable body so that the movable body can move in one of the opening and closing directions of the door, and the drive source is operated when the operation of the drive source is stopped. Is configured to be disconnected from the first rotating body.

The drive source is arranged so as to project in the arrangement direction of the first and second rotating bodies, and the output shaft of the drive source and the first rotating body are linked by a bevel gear,
Alternatively, the drive source is arranged so as to project in the arrangement direction of the first and second rotating bodies, and the first shaft is provided on the output shaft of the drive source.
It is preferable that the rotary body is provided, and the traveling body hung on the first rotary body is turned by the auxiliary rotary body to be hung on the second rotary body.

As the tension applying means, a tension spring can be stretched between the at least one rotating body and the movable body, and the detecting means can detect the extension of the tension spring. it can. Alternatively, the tension applying means may include a tension rotating body movably supported by the frame body, and a spring for urging the tension rotating body toward the traveling body side. It is possible to use a micro switch that operates by moving the rotating body. Further, the inner end of the actuating member and the movable body can be connected by a ball joint, and the outer end of the actuating member and the door or the fixed portion can be connected by a ball joint. Further, in order to reduce the weight, at least the frame body and the actuating member can be formed of plastic.

[0012]

Therefore, according to the present invention, the outer ends of the frame and the actuating member can be installed by selectively attaching them to the fixed portion and the door, and the first rotating body can be installed by driving the drive source. By rotating the traveling body to one side and moving the movable body by rotating the traveling body to one side, the door is rotated and opened through the operating member, and then the first rotating body is rotated to the other side by driving the drive source. By moving the traveling body to the other side and moving the movable body, the door can be rotated in the opposite direction through the actuating member to be closed. In this way, the rotational force of the rotating body is converted into a linear motion due to the traveling of the traveling body, and the door is attached to the door through the movable body movably supported by the frame body and the operating member connected to the movable body. Because it will be transmitted
Even if the rotating force of the rotating body is relatively weak, the rotating force can be reliably transmitted to the door. When the door is opened / closed, tension is applied to the running body, so the extension of the running body can be corrected, and a person or the like may hit the door or force the door to open / close midway. When a sudden load change occurs such as when the vehicle stops, the traveling body can be slipped on the first rotating body to absorb the load change.

When a sudden load change occurs as described above, the drive of the drive source can be stopped by the detection of the detection means.

Further, by detecting the traveling position of the movable body by the detecting means, the drive source can be controlled to arbitrarily set the opening / closing speed and the opening / closing angle of the door.

Further, a load is constantly applied to the movable body so that the movable body can move in one of the opening and closing directions of the door, and when the drive source stops operating due to a failure, this drive source causes the first rotating body to move. The door can be closed or opened automatically and the door can be manually operated in the reverse direction against the load applying means.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described. 1 to 6 show an automatic door opening / closing device according to a first embodiment of the present invention, and FIG. 1 is a partially cutaway plan view,
2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a bottom view, FIG. 4 is a sectional view taken along the line BB of FIG. 1, FIG. FIG.

As shown in FIGS. 1 to 4, the frame 1 is made of plastic, and the rectangular front plate 2 and the rear plate 3 are connected at their both ends by side plates 4 and 5 and bottom plates 6 and 7, and an intermediate portion is formed. The spaces are connected and reinforced by a reinforcing plate 8. A guide groove 9 is provided along the longitudinal direction on the bottom side of the front plate 2 and the rear plate 3.
And 10 are formed.

Plastic pulleys 11 and 12 as first and second rotating bodies are rotatably provided on both sides of the frame body 1. The first pulley 11 is linked to a drive source supported by the frame body 1. That is, the drive source includes a motor 13 and a reduction gear mechanism 14, etc., the case of the reduction gear mechanism 14 is attached to the front plate 2 with bolts 15, and its output shaft is fixed to the first pulley 11 with a screw 16. It is linked to the manufactured shaft 17 via a clutch 18. The clutch 18 is configured so that the reduction gear mechanism 14 and the shaft 17 of the first pulley 11 are disengaged when the energization is stopped. The second pulley 12 is rotatably supported by a plastic shaft 19 mounted between the front plate 2 and the rear plate 3 of the frame body 1.

A rolling element, for example, a ball bearing 20 is movably supported as a movable body between the guide grooves 9 and 10 of the frame body 1. An outer race of the ball bearing 20 is made of plastic, and an inner end of a plastic link 22 which is an operating member is connected to a shaft 21 attached to the inner race via a plastic ball joint 23.

A small-diameter wire rope 24 is hung as a running body on the first and second pulleys 11 and 12, and both ends of the wire rope 24 are connected to a shaft 21 of a ball bearing 20 via tension springs 25 and 26, respectively. The wire rope 24 is in an endless state, and the wire rope 24 is connected to the tension spring 25, so that the wire rope 24 can travel with the rotation of the first pulley 11.
Tension is applied by 26. Therefore, when the first pulley 11 is rotated in either direction, the wire rope 24 travels and the ball bearing 20
Can travel along the guide grooves 9 and 10 as shown by the chain lines in FIGS. 1 and 3. Also, when a sudden load change occurs, the tension springs 25 and 26 expand and the wire rope 2
4 can be slipped on the first pulley 11.

Second pulley 12 and ball bearing 2
The tension spring 25 inserted in the middle of the wire rope 24 between the shaft 21 of 0 and 0 is provided with a potentiometer 27,
With the extension of the tension spring 25, it is possible to detect the sudden change in load as described above and stop the driving of the motor 13. A potentiometer 28 is attached to the reinforcing plate 8 along the longitudinal direction thereof, and a brush 29 for the potentiometer is attached to the shaft 21 of the ball bearing 20. Then, the traveling position of the ball bearing 20 is continuously detected by the potentiometer 28 steplessly, the drive of the motor 13 is controlled at a preset position, the traveling speeds of the wire rope 24 and the ball bearing 20 are changed, and ,
It is possible to stop.

A spring-shaped constant force spring 30 is supported by a shaft 31 at the end of the frame 1 on the second pulley 12 side. One end of the constant force spring 30 is pulled out and connected to the shaft 21 of the ball bearing 20, so that the ball bearing 20 can move to one side.
The load due to the tensile force is constantly applied.

In the door automatic opening / closing device 32 of the embodiment of the present invention configured as described above, the outer ends of the frame 1 and the link 22 are selectively attached to the fixed portion and the door. In this embodiment, as shown in FIG. 5 and FIG.
The rear plate 3 is attached to the fixed portion 33, and the outer end of the link 22 is rotatably connected to a plastic attachment 35 attached to the upper portion of the door 34 via a plastic ball joint 36. Thus, the inner end of the link 22 and the shaft 21 of the ball bearing 20 are
And the attachment 35 of the door 34 by connecting the outer end of the link 22 and the attachment 35 of the door 34 via the ball joint 36. This can be absorbed, and even if the door 34 is distorted with respect to the fixed portion 33 after attachment, it can be absorbed. Reference numeral 37 in FIG. 5 is a control circuit for the motor 13 and the like attached to the front plate 2 of the frame 1.

The operation of the above configuration will be described below. Now, as shown in FIG. 6, it is assumed that the ball bearing 20 is located on the second pulley 12 side and the door 34 is closed. Here, the motor 13 is driven by operating a switch (not shown), and the first pulley 11 is moved to one side (see FIG. 2) via the reduction gear mechanism 14 and the clutch 18.
Counterclockwise). Along with this, the wire rope 24 and the like are run, and the ball bearing 20 is moved along the guide grooves 9 and 10 of the frame body 1 toward the first pulley 11 side as shown by the chain line. With this movement, the door 34 can be opened via the link 22 or the like as shown by the chain line. After opening the door 34 for a certain period of time, the motor 13 is driven in the reverse direction, the first pulley 11 is rotated to the other side (clockwise direction in FIG. 2), and the wire rope 24 and the like are run to the other side to move the ball bearing 20. Move to the second pulley 12 side. Accordingly, the door 34 can be closed via the link 22 or the like as shown by the solid line. In this way, the rotational force of the first pulley 11 is converted into a linear motion due to the traveling of the wire rope 24, and is transmitted to the door 34 via the ball bearing 20, the link 22, etc. movably supported on the frame 1. Therefore, even if the rotational force of the first pulley 11 is relatively weak, the rotational force can be reliably transmitted to the door 34, and therefore even a heavy door can be reliably opened and closed.

When the door 34 is opened and closed, the tension is applied to the wire rope 24 by the tension springs 25 and 26 as described above, so that the elongation of the wire rope 24 can be corrected and therefore the door rope 24 can be corrected. 34 can be reliably opened and closed, and when the door 34 is closed, it can be maintained in a tightly closed state. In addition, when a sudden load change occurs such as when a person hits the door 34 or when the door 34 is forcibly stopped from being opened or closed, the tension springs 25 and 26 are extended to move the wire rope 24 to the first position. The pulley 11 can be slipped on to absorb the load change, and the potentiometer 27 detects the load change to stop the drive of the motor 13.
It is possible to improve safety and prevent damage to the device.

Further, as described above, the ball bearing 20
The traveling position of the wire rope 24 and the ball bearing 20 is detected by the potentiometer 28.
Since it is possible to change the traveling speed of the vehicle and to stop the vehicle, the opening / closing speed of the door 34 can be controlled to be changed midway, and the opening / closing position of the door 34 can be arbitrarily selected. it can.

Further, as described above, the ball bearing 20
On the other hand, in the illustrated example, when the constant load spring 30 constantly pressurizes the door 34 in the closing direction, and the energization is stopped,
Since the clutch 18 is disengaged, the door 34 can be automatically closed when the motor 13 fails, and the door 34 can be manually opened against the elasticity of the constant force spring 30. It is possible to secure the safety at the time.

A magnetic scale or the like may be used instead of the potentiometer 28. In addition, the constant force spring 3
In the case of 0, the door 34 may be always pressurized in the opening direction. Further, a weight or the like may be used instead of the constant force spring 30. In addition, as a movable body, a ball bearing 20
Instead of this, various types such as a plastic disc, a plastic rectangular plate-like sliding body, or a moving body having ball bearings at the four corners of the plate can be used.

Next, a second embodiment of the present invention will be described. 7 to 10 show an automatic door opening / closing device according to a second embodiment of the present invention, FIG. 7 is a partially cutaway plan view, FIG. 8 is a sectional view taken along the line CC of FIG. 7, and FIG. 9 is a bottom view. 10 is a sectional view taken along the line DD of FIG.

In this embodiment, the means for applying tension to the wire rope 24 and the means for detecting a sudden load are different from those of the first embodiment, and therefore the same parts are designated by the same reference numerals. The description will be omitted and different configurations will be described.

As shown in FIGS. 7 to 10, a recessed hole 38 is formed in the longitudinal direction at an intermediate portion between the front plate 2 and the rear plate 3 of the frame body 1, and the recessed hole 38 is formed downward from the intermediate portion. A long hole 39 that communicates with the recessed hole 38 and is open to the outside is formed in the range up to. A rotating shaft 41 attached to a tension rotating body 40 is rotatably supported in the elongated holes 39 on both sides so as to be movable along the elongated holes 39. A compression spring 42 is inserted into the recessed hole 38, a blind plug 43 is attached to the opening of the recessed hole 38, and the elasticity of the compression spring 42 causes the rotating shaft 41 and the tension rotating body 40 to move downward. The wire rope 24 is pressed against the wire rope 24 and tension is applied to the wire rope 24. Further, when a sudden load change occurs, the tension rotating body 40 and the rotating shaft 41 move upward against the elasticity of the compression spring 42, and the wire rope 24 can be slipped on the first pulley 11. It has become. Rotating shaft 41
One end of the micro switch 44 is projected to the outside of the front plate 2, and the front plate 2 is located above the projecting end and corresponds to the micro switch 44.
Is attached, and when the load changes abruptly as described above, the tension rotating body 40 and the rotating shaft 41 move the compression spring 4
When it rises against the elasticity of 2, the micro switch 44 is actuated by the rotating shaft 41, and the driving of the motor 13 can be stopped.

Next, a third embodiment of the present invention will be described. 11 and 12 show an automatic door opening / closing device according to a third embodiment of the present invention, FIG. 11 is a sectional view similar to FIG. 2, and FIG. 12 is a bottom view.

In this embodiment, the means for detecting the traveling position of the ball bearing 20 is different from that of the first embodiment. Therefore, the same parts are designated by the same reference numerals, and the description thereof will be omitted. To do.

As shown in FIGS. 11 and 12, the wire rope 24 is provided with a first pulley 11 and a ball bearing 2.
Between 0 and the second pulley 12 and ball bearing 2
The magnets 45 and 46 are attached so that their positions can be adjusted between 0, and a plurality of magnets are provided on both sides of the reinforcing plate 8 along the traveling direction of the wire rope 24, that is, the moving direction of the magnets 45 and 46 (illustrated example). Then two magnetic sensors 47
a, 47b and 48a, 48b are attached. And, the magnet 45 which moves the position of the ball bearing 20 integrally with the traveling of the wire rope 24,
Or 46 to the magnetic sensors 47a, 47b, or 4
8a and 48b detect the drive of the motor 13 to detect the wire rope 24 and the ball bearing 2.
Change the running speed of 0 or stop, therefore
The opening / closing speed of the door 34 is changed on the way, or the door 34
The open / close position of can be arbitrarily selected.

The magnets 45 and 46 may be attached to the reinforcing plate 8 and the magnetic sensors 47a and 47b and 48a and 48b may be attached to the wire rope 24. It is also possible to use a cam and a micro switch.

Next, a fourth embodiment of the present invention will be described. 13 to 15 show an automatic door opening / closing device according to a fourth embodiment of the present invention, FIG. 13 is a partially cutaway plan view, FIG. 14 is a sectional view taken along the line EE of FIG. 13, and FIG.
4 is an F-F arrow view of FIG.

In the present embodiment, the above first to third
Since the arrangement of the drive source such as the motor 13 is different from each of the embodiments, the same portions are denoted by the same reference numerals, and the description thereof will be omitted, and different configurations will be described.

As shown in FIGS. 13 to 15, in the drive source including the motor 13 and the reduction gear mechanism 14, the case of the reduction gear mechanism 14 is attached to the side plate 5 of the frame 1. The output shaft 49 of the reduction gear mechanism 14 is inserted through the side plate 5, and the pulley 11 which is the first rotating body is attached to the inward protruding portion thereof. Front plate 2 on the side plate 5 side
Auxiliary pulleys 50a and 50b, which are auxiliary rotating bodies, are rotatably supported on the upper and lower portions of the back plate 3. These auxiliary pulleys 50a and 50b have their axial centers in a direction orthogonal to the axial center of the first pulley 11, that is, the second pulley 12
It is arranged so as to be parallel to the axis center of. The wire rope 24 hung on the first pulley 11 is turned around by the auxiliary pulleys 50a and 50b, and the second pulley 1
It is hung on 2. Then, by driving the motor 13, the first pulley 11 is moved through the reduction gear mechanism 14,
Or by rotating it to the other side, the wire rope 2
4 and run the ball bearing 20 along the guide grooves 9 and 10 of the frame 1 as shown by the chain line in the first pulley 1
The door 34 (see FIG. 5) can be opened and closed by moving it to the first side or the second pulley 12 side.

According to this embodiment, the drive sources for the motor 13, the reduction gear mechanism 14, etc. are the first and second pulleys 11, 12.
This drive source is arranged in the fixing portion 3 because it is arranged in the arrangement direction of
3 (see FIG. 5), the protruding length from the fixing portion 33 can be shortened (when the frame body 1 is attached to the door 34, the protruding length from the door 34 can be shortened. it can.). Therefore, it is possible to prevent damage and the like without hindering the user, and improve the aesthetic appearance.

Next, a fifth embodiment of the present invention will be described. FIG. 16 is a partially cutaway plan view showing an automatic door opening / closing device according to a fifth embodiment of the present invention.

In the present embodiment, the above first to third
In particular, since the arrangement of the motor 13 and the like is different from that of the above embodiment, the same portions are denoted by the same reference numerals and the description thereof will be omitted.
The different configuration will be described.

As shown in FIG. 16, the first pulley 11
A bevel gear 51 is integrally provided on the side surface of the. In the drive source including the motor 13 and the reduction gear mechanism 14, the case of the reduction gear mechanism 14 is attached to the side plate 5 of the frame body 1. The output shaft 49 of the reduction gear mechanism 14 is inserted through the side plate 5, a bevel gear 52 is attached to the inward protruding portion thereof, and the bevel gear 52 is meshed with the bevel gear 51 of the first pulley 11. Then, by driving the motor 13, the first pulley 11 is rotated to one side or the other side via the reduction gear mechanism 14 and the bevel gears 51 and 52, so that the wire rope 24 and the like are run and the ball bearing 20 is moved to the frame body. The door 34 (see FIG. 5) can be opened / closed by moving the first guide groove 9 or 10 to the first pulley 11 side or the second pulley 12 side as indicated by the chain line. ..

According to this embodiment, similarly to the fourth embodiment, the drive sources such as the motor 13 and the reduction gear mechanism 14 are arranged in the arrangement direction of the first and second pulleys 11 and 12. Therefore, this drive source can be arranged along the fixed portion 33 (see FIG. 5) to shorten the protruding length from the fixed portion 33 (when the frame body 1 is attached to the door 34, The protruding length can be shortened.). Therefore, it is possible to prevent damage and the like without hindering the user, and improve the aesthetic appearance.

In the above embodiment, the door 34 is set to open 90 degrees, but it can be set to open at an angle larger than that, and it can be applied to a slide type door other than the swing type. Can be applied. Besides, the present invention can be variously modified in design without departing from the basic technical idea thereof.

[0045]

As described above, according to the present invention,
It can be installed by selectively attaching the outer ends of the frame and the actuating member to the fixed portion and the door, and thus can be applied to an existing door as an external type. Then, by driving the driving source, the first rotating body is rotated in one direction, the traveling body is caused to travel in one direction, and the movable body is moved, whereby the door is rotated and opened through the actuating member, and then the driving source is moved. By driving the first rotating body to the other side and the traveling body to the other side to move the movable body, the door can be rotated in the opposite direction through the operating member to be closed. In this way, the rotational force of the rotating body is converted into a linear motion due to the traveling of the traveling body, and the door is attached to the door through the movable body movably supported by the frame body and the operating member connected to the movable body. Since it is transmitted, even if the rotational force of the rotating body is relatively weak, the rotational force can be reliably transmitted to the door. Therefore, the structure can be simplified and the cost can be reduced, and not only the light door,
Even a heavy door can be opened and closed securely. Also, when the door is opened and closed, tension is applied to the running body, so it is possible to correct the extension of the running body, and it is possible for someone to hit the door or force the door to open or close midway. When a sudden load change occurs such as when the vehicle stops, the traveling body can be slipped on the first rotating body to absorb the load change. Therefore, it is possible to surely open / close the door, maintain the door in a tightly closed state, improve safety, and the like.

Further, when a sudden load change occurs as described above, the drive of the drive source can be stopped by the detection of the detecting means, so that the damage of the present device can be prevented.

Further, by detecting the traveling position of the movable body by the detecting means, the drive source can be controlled to arbitrarily set the opening / closing speed and the opening / closing angle of the door. Therefore, the operability of the door can be improved.

Further, a load is constantly applied to the movable body so that the movable body can move in one of the opening and closing directions of the door.
Since it is disconnected from the rotating body, the door can be automatically closed or opened, and the door can be manually operated in the opposite direction against the load applying means. Therefore, it is possible to improve safety in the event of a failure or the like.

Further, the drive source is arranged so as to project in the arrangement direction of the first and second rotating bodies, and the output shaft of the drive source and the first rotating body are linked by a bevel gear, or the drive source is connected. Arranged so as to project in the arrangement direction of the first and second rotating bodies,
The first rotating body is provided on the output shaft of the drive source, and the traveling body hung on the first rotating body is turned by the auxiliary rotating body to be hung on the second rotating body. The protrusion length can be shortened along the fixing portion or the door. Therefore, the drive source can be prevented from being damaged and the aesthetic appearance can be improved.

Further, a tension spring is stretched between at least one of the rotating body and the movable body as the tension applying means, and the extension of the tension spring is detected as the detecting means, thereby simplifying the structure and reducing the cost. Can be planned. Further, a tension rotating body movably supported by the frame body and a spring for urging the tension rotating body toward the traveling body side are provided as the tension applying means, and the tension rotating body is moved by the movement of the tension rotating body as the detecting means. By using a micro switch that operates, reliability of each part can be improved and durability can be improved. Further, by connecting the inner end of the actuating member to the movable body by a ball joint and connecting the outer end of the actuating member to the door, or the fixed part by a ball joint, even if the mounting position accuracy with respect to the fixed part and the door is poor. Can be absorbed, and even if the door is distorted with respect to the fixed portion after mounting, it can be absorbed. Further, by forming at least the frame body and the actuating member from plastic, weight reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an automatic door opening / closing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, showing the automatic door opening / closing device.

FIG. 3 is a bottom view showing the automatic door opening / closing device.

FIG. 4 is a cross-sectional view showing the automatic door opening / closing device, taken along the line BB in FIG.

FIG. 5 is an explanatory view showing an implementation state of the automatic door opening / closing device.

FIG. 6 is an explanatory diagram of a door opening / closing operation showing the door automatic opening / closing device.

FIG. 7 is a partially cutaway plan view showing an automatic door opening / closing device according to a second embodiment of the present invention.

FIG. 8 is a sectional view taken along line CC of FIG. 7, showing the automatic door opening / closing device.

FIG. 9 is a bottom view showing the automatic door opening / closing device.

FIG. 10 is a sectional view taken along line DD of FIG. 7, showing the door automatic opening / closing device.

FIG. 11 is a sectional view similar to FIG. 2, showing an automatic door opening / closing device according to a third embodiment of the present invention.

FIG. 12 is a bottom view showing the automatic door opening / closing device.

FIG. 13 is a partially cutaway plan view showing an automatic door opening / closing device according to a fourth embodiment of the present invention.

FIG. 14 shows the automatic door opening / closing device, and is taken along line EE of FIG.
Sectional view

FIG. 15 shows the automatic door opening / closing device, and is taken along line FF of FIG.
Arrow view

FIG. 16 is a partially cutaway plan view showing an automatic door opening / closing device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 9 Guide groove 10 Guide groove 11 1st pulley (rotating body) 12 2nd pulley (rotating body) 13 Motor 14 Reduction gear mechanism 18 Clutch 20 Ball bearing (movable body) 22 Link (operating member) 23 Ball Joint 24 Wire rope (running body) 25 Tensile spring 26 Tensile spring 27 Potentiometer 28 Potentiometer 30 Constant load spring 32 Automatic door opening / closing device of the present invention 33 Fixed part 34 Door 36 Ball joint 40 Tension rotary body 44 Micro switch 45 Magnet 46 Magnet 47 magnetic sensor 48 magnetic sensor 50 auxiliary pulley 51 bevel gear 52 bevel gear

Claims (12)

[Claims] 1. A frame body, first and second rotating bodies rotatably provided on both sides of the frame body, a drive source linked to the first rotating body, and the frame body. The movable body movably supported between the rotating bodies is hung on the first and second rotating bodies, and is connected to the movable body in an endless manner to rotate the first rotating body. A traveling body that travels with the traveling body to move the movable body, an actuating member whose inner end is connected to the movable body, and a tension is applied to the traveling body, and the traveling body is moved when the load suddenly changes. An automatic door opening / closing device, comprising: tension applying means capable of slipping on a first rotating body, and configured so that outer ends of the frame body and the operating member are selectively attached to a fixed portion and a door. 2. The door automatic opening / closing device according to claim 1, further comprising a detection means for detecting a sudden load change and stopping the driving of the drive source. 3. The automatic door opening / closing apparatus according to claim 1, further comprising a detection unit for detecting a traveling position of the movable body and controlling a drive source. 4. A means for constantly applying a load to the movable body so that the movable body can move in one of the opening and closing directions of the door, and the drive source is the first rotating body when the operation of the drive source is stopped. The automatic door opening / closing device according to any one of claims 1 to 3, which is configured to be shut off. 5. The drive source is arranged so as to project in the arrangement direction of the first and second rotating bodies, and the output shaft of the drive source and the first rotating body are linked by a bevel gear. 5. An automatic door opening / closing device according to any one of 4 to 4. 6. The drive source is arranged so as to project in the arrangement direction of the first and second rotating bodies, and the first rotating body is provided on the output shaft of the drive source. The automatic door opening / closing device according to any one of claims 1 to 4, wherein the traveling body hung on the second rotating body is turned by an auxiliary rotating body and hung on the second rotating body. 7. The tension applying means comprises a tension spring stretched between at least one of the rotating body and the movable body.
7. The door automatic opening / closing device according to any one of 1 to 6. 8. The door automatic opening / closing device according to claim 7, wherein the load change detecting means detects extension of the tension spring. 9. A tension rotating body, wherein the tension applying means is movably supported by the frame body, and a spring for urging the tension rotating body toward the traveling body. Automatic door opening and closing device described. 10. The automatic door opening / closing device according to claim 9, wherein the load change detecting means comprises a microswitch which operates by movement of the tension rotating body. 11. An inner end of the operating member is connected to the movable body through a ball joint, and an outer end of the operating member is a door,
Alternatively, the door automatic opening / closing device according to any one of claims 1 to 10, which is connected to the fixed portion via a ball joint. 12. The door automatic opening / closing device according to claim 1, wherein at least the frame and the operating member are made of plastic.