JPH0913792A - Automatic door device for telephone booth - Google Patents

Abstract

PURPOSE: To prevent breakage or malfunction of an automatic door opening/ closing unit, by providing a means absorbing excessive opening forces when an excessive force larger than a preset limit is exerted on the door from the external side of a telephone booth, between a power transmission means and an opening/closing drive source. CONSTITUTION: When an excessive opening force larger than a preset limit is exerted on a folding door 17 from the outside of a telephone booth 1, the force is absorbed by a coupling with a clutch installed between a motor 31, a reducer 32, and a rotary shaft coupling 34. In this way, damage and malfunction of the motor unit 30 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door device for a telephone box, and particularly to a telephone box which adopts a folding door type automatic door as its door, and an excessive force (including impact force) applied to the door. The present invention relates to an automatic door device capable of protecting the automatic opening / closing mechanism of the door.

[0002]

2. Description of the Related Art Generally, a box-type public telephone is provided with an opening / closing door so that a user can open and close the door by himself / herself. In recent years, reflecting the increasing awareness of high welfare society, an increasing number of telephone boxes are equipped with an automatic opening / closing door that can be easily used by elderly people and people with physical disabilities who use wheelchairs.

As such an automatic opening / closing door, for example, one described in Japanese Utility Model Laid-Open No. 1-91956 is known. According to one aspect thereof, the automatic door device described in this publication cuts off a part of a stile rail at the upper part of a door of a telephone box, and cuts a torque motor, a speed reducer, a rotary plate, and the like into a switch plate and a fixed reinforcement. The unit integrated with a plate is firmly attached, and the rotary shaft coupling body is fixed to the upper end of the small door that forms one of the folding doors. Thus, the torque of the torque motor is transmitted vertically to the small door, and the folding door including the small door and the large door is folded. The user can open and close the folding door automatically by simply touching, for example, a switch mounted inside and outside the talking box, and the motor rotates in the forward or reverse direction.

[0004]

However, although the above-mentioned telephone box can satisfactorily achieve the initial purpose of (semi) automatic opening and closing of the door, it protects against excessive force applied to the door intentionally or unknowingly when opening and closing. There was room for improvement in terms of.

First of all, unfortunately, a lack of public morals for public items such as telephone booths is sometimes found, and in severe cases, the doors of telephone booths may even be intentionally kicked off. When the folding door of the above-mentioned conventional telephone box is kicked off, the impact force is directly transmitted to the speed reducer of the motor unit through the small door of the folding door. Since the motor performs a restricted operation that tries to rotate the door in the closing direction with a weak current even when the door is closed, if the impact force is strong, a reverse load is momentarily applied to the reducer gear and the motor, and Damage
In severe cases, the motor unit itself could be destroyed.

Secondly, there is a case where the operator tries to open the door of the telephone box by holding the handle of the door with full force without knowing (without knowing) that the door of the telephone box is (semi) automatic opening and closing. In such a case, a force that forcibly rotates the motor in the restricted operation in the reverse direction may act on the motor via the speed reducer, causing the motor to burn out or break the gear of the speed reducer.

The present invention has been made in view of the above circumstances. Technically, while expecting to improve the public morale of the user, it is technically possible to provide an impact force or a manual release caused by kicking from the outside. An object of the present invention is to almost certainly prevent a situation in which a door automatic opening / closing unit is damaged or fails even when a strong force is applied.

[0008]

In order to achieve the above object, an automatic door device for a telephone box according to the present invention automatically opens and closes the door of the telephone box when the door is used. An opening / closing drive source to be generated, a power conversion unit attached to the door and converting power generated by the opening / closing drive source into an opening / closing operation of the door, and interposed between the power conversion unit and the opening / closing drive source. Further, there is provided an excessive opening force absorbing means for absorbing the opening force when an excessive opening force exceeding a set limit is applied to the door from the outside of the telephone box.

The excessive opening force absorbing means includes, for example, a rotating portion attached to the power converting means and rotated by being biased, and a fixed portion attached to the opening / closing drive source and abutting on the rotating portion. A pressing member that is interposed between the fixed portion and the rotating portion and presses both the fixed portion and the rotating portion with a predetermined pressure, and the pressing member has one end locked to the fixed body. A plurality of springs and a steel ball locked to the other end of each of the plurality of springs, and a part of the plurality of steel balls is individually attached to the contact surface of the rotating portion with the fixed portion. It is a coupling with a clutch having a structure in which a plurality of recesses are formed so as to be immersed in

Preferably, the door is a folding door having a structure in which two opening / closing bodies are connected via a hinge, and when the doors are opened, the two opening / closing bodies are each rotated by 90 ° in different directions. Therefore, four sets of the pressing member and the concave portion are provided on the abutting surface and are spaced apart from each other by 90 °.

The excessive opening force absorbing means includes, for example, a manual door opening detecting means for detecting an operation of manually opening the door, and a case where the manual door opening detecting means detects the manual opening of the door. And evacuation automatic door opening means for automatically opening the door from its closed state.

[0012] Preferably, the manual door open detecting means is a limit switch installed at a predetermined position of the telephone box which is urged by the opening / closing operation of the door. It was mounted such that the operation was biased by the door only when the door was opened to generate a switch signal change.

The opening / closing drive source includes, for example, an electric motor and a speed reducer for reducing the rotational speed of the electric motor.

It is also a preferable aspect to further comprise a restraining operation means for restraining the closed state and the opened state of the door when the door is closed and when the door is opened.

[0015]

When the door of the telephone box is normally opened / closed, the power generated by the opening / closing drive source is converted into the opening / closing operation by the power converting means, so that the door is opened / closed.

On the other hand, when an excessive opening force exceeding the set limit is applied to the door due to an operation such as a door made of a folding door being kicked from the outside, this opening force acts as a power conversion means. It is absorbed by the excessive opening force absorbing means which is interposed between the open / close drive source and is composed of, for example, a coupling with a clutch. Therefore, the kicking force does not reach the opening / closing drive means including the electric motor and the speed reducer, and the gear damage of the speed reducer and the failure of the electric motor can be prevented.

Further, it is assumed that the door is manually opened without knowing (without knowing) that the telephone box has an automatic door device. This manual opening operation is detected by a manual opening detection means (for example, a limit switch capable of detecting a slight displacement due to manual opening of the door), and the evacuation automatic opening means automatically opens the door from its closed state. . For this reason, the user does not need to apply excessive force unnecessarily because he / she does not think that the door will open easily.For example, an opening / closing drive means such as an electric motor or a speed reducer performing a restraining operation in the direction of closing the door can be used. It is not necessary to apply excessive force in the opposite direction, and damage to the gears of the reduction gear and burnout of the electric motor can be prevented.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

1 and 2 show the overall construction of a telephone box 1 incorporating the automatic door device according to the present invention. This telephone box 1 is a base mounting plate 10 installed on the ground.
The entire box 10 is erected in a box shape.
As shown in FIG. 2, on the base mounting plates 10 ... 10 at the four corners,
Rear three-sided stile assembly columns 11, 12 and front left vertical column 13 and right vertical column 14 are respectively erected, and these columns 11 to 1
A roof 15 is provided on the roof 4. Between the left and right vertical columns 13 and 14 on the front side, a door upper stile rail 16 is horizontally installed on the upper end side thereof, and an automatic opening / closing folding door 17 is installed below it.

The folding door 17 includes a small door 18 located on the shaft support side (right side in FIG. 1) and a large door 1 located on the opposite side.
9 and a door connecting butterfly plate 20 connecting both doors 18 and 19 in a foldable manner. On the right vertical column side of the upper end of the small door 18, a rotary shaft coupling connected to an output shaft of a motor unit described later, which is installed in a state where a part of the upper door stile rail 16 is cut off, is inserted, and a lower end of the small door 18 is inserted. A pivot main body 22 is embedded on the right vertical column side of the section, and a pivot shaft 23 thereof is pivotally supported by a pivot L angle 24 attached to the right vertical column 14.

The upper end portion of the large door 19 is suspended in a suspension wheel main body 26 attached to the rail 16 so as to be slidable inside the upper stile rail 16. As shown in FIGS. 3 and 4, the suspension wheel main body 26 has horizontal moving rollers 26b, 26b and a guide roller 26 on an upper portion of a rotary suspension shaft 26a.
c, 26c are attached, and a suspension arm 26d is attached to the lower part, the roller side is slidably housed in the rail portion 16a below the stile rail 16, and the suspension arm 26d is attached to the upper end portion of the large door 19. Is. For this reason,
The folding door 17 rotates the small door 18 toward the inside of the box by 90 ° with the right vertical pillar side of the small door 18 as a fulcrum, thereby pulling the large door 19 toward the right vertical pillar 14 side and the small door 18 and The large door 19 can be folded using the butterfly plate 20 as a folding point. On the contrary, when the small door 18 is rotated to the outside of the box from the folded state (door open), the small door 18 and the large door 19 are opened and the door is closed.

In FIG. 2, reference numerals 27 ... 27 denote three-way upper stiles.

A motor unit 30 as a rotary drive mechanism of the automatic door device is provided on the upper portion of the small door 18 on the right vertical column side in FIG.
It is installed as shown in FIGS. As shown in FIGS. 5 and 6, the motor unit 30 includes an AC electric motor (torque motor) 31, a speed reducer 32, and a coupling 3 with a clutch.
3, and a rotary shaft coupling 34. The entire motor unit 30 is designed such that a predetermined part of the upper door stile rail 16 on the right vertical column side is cut off, and is housed and installed in the cut out space. Right vertical pole 14 to help with this installation
A back plate 38 is attached to the inner upper end of the back plate 38 for reinforcement, and the back plate 38 is provided at a predetermined height position of the cutting space.
A mounting base 39 is horizontally mounted. Insert holes 39a, 39a are formed in the mount 39.

The electric motor 31 includes two mounting plates 41a,
41b, and columns 41c ... 41c connecting them are fixedly supported by a sandwiching body 41. One of the holding bodies 41 is attached to the roof 15 of the box via the L metal fittings 42, 42, and the electric motor 31 is suspended with its rotation output shaft facing downward. An alternating current is supplied to the electric motor 31 from a power supply circuit in a controller, which will be described later, and the electric motor 31 is normally or reversely rotated according to the control direction of the current.

The speed reducer 32 is a holding member 41 of the electric motor 31.
Is integrally attached to the lower side surface of the motor and reduces the rotation speed of the motor output shaft at a predetermined ratio. A lower support plate 42 is fixedly provided on the lower surface side of the speed reducer 32, and an output shaft 32a of the speed reducer 32 projects by loosely inserting a hole in the lower support plate 42. As shown in FIG. 6, the key shaft pin 32 is attached to the output shaft 32a.
aa is formed. A magnet 43 is attached to the base of the output shaft 32a, and the position of the magnet 43 is detected by a proximity switch 44 installed on the lower support 42.

Further, a mounting arm 45 extends as shown in the drawing at one end of the lower support plate 42 in the lateral direction of the door, and this mounting arm 45 is mounted on the reinforcing plate 16b of the upper door stile rail 16 of the door. . Also, the mounting arm 4
Two insertion fixing shafts 46, 46 are provided on the lower side of the end of the lower support plate 42 on the opposite side to 5, and the insertion fixing shafts 46, 46 are on the right vertical column side of the cutting space described above. Is inserted into the insertion holes 39a, 39a of the mounting base 39 located at.

A coupling 33 with a clutch is connected to the lower side of the speed reducer 32. A coupling hole 33H having a key groove is provided in the center of the coupling 33 with a clutch.
The output shaft 32a of the speed reducer 32 is fitted and inserted in 3H, and both are connected.

The coupling 33 with a clutch is attached to the speed reducer 3
Coupling to two is one aspect embodying the present invention. The coupling 33 with a clutch is shown in FIG.
As shown in (a) and (b), a base body 50 having a substantially T-shaped longitudinal section and a flat upper surface, and a housing 5 rotatably attached to the base body 50 from above.
And 1. Upper surface of base body 50 (slip surface 50U)
As shown in FIG. 9, four hemispherical grooves M1 to M4 are formed at an equal angle of 90 °, and substantially lower halves of the steel balls B1 to B4 fall into the grooves M1 to M4. (See FIG. 8A). In the center of the housing 51, the above-mentioned coupling hole 33H is formed so as to penetrate therethrough in the longitudinal direction, and four bottomed-shaped members having an equal angle of 90 ° on the transverse cross section are formed around the coupling hole 33H. Steel ball receiving holes H1 to H
4 is formed in a downward opening state. Steel ball receiving hole H1
Each of springs S1 (to S4) having a predetermined spring coefficient with one end locked is inserted into each of the springs S1 to S4.
4 is the sliding surface 50 of the base body 50, which is made of the steel balls B1 to B4.
Each is held down by U. Normally, the steel balls B1 to B4 are suppressed by falling into the grooves M1 to M4 by the spring force of the springs S1 to S4.

On the lower surface side of the base body 50, a rectangular parallelepiped knob 50a is integrally extended. This knob 5
0a is connected to the rotary shaft coupling 34 located therebelow.

As shown in FIGS. 5 and 6, the rotary shaft coupling 34 is a cylindrical shaft body 55, and a rotary shaft arm 56 fixed laterally to the upper end surface of the shaft body 55 by means of screws.
And At the mounting portion of the rotary shaft arm 56 to the shaft body 55, a long groove 56A having a predetermined length along the arm longitudinal direction is formed.
The knob 50a of the clutch-equipped coupling 33 is inserted into the long groove 56A and screwed. Therefore, when the knob 50a rotates in the horizontal plane, the entire rotary shaft coupling 34 also rotates in the same direction.

The rotary shaft coupling 34 is further fixed to the small door 18. Specifically, the shaft 55 is the small door 1
8, the rotary shaft arm 56 is screwed to the upper end surface of the upper door frame 18L of the small door 18. Therefore, when the rotary shaft coupling 34 rotates in the horizontal plane, the small door 18 can also integrally rotate in that direction.

Further, as shown in FIGS. 1 and 2, optical door sensors 60 and 61 for detecting the entry and exit of a telephone user are installed at predetermined wall positions inside and outside the telephone box 1. Of these, the door sensors 60 on the outside of the box are attached to the upper and lower ends of the left vertical column 13 on the entire surface of the box,
It has an optical sensor body 60M on the roof side and a light beam reflector 60R on the lower end side. Door sensor 61 inside the box
Is attached to the center of the inner wall of the left side of the box (see FIG. 2) and has a roof side optical sensor body 61M and a ground side light beam reflector 61R. Therefore, both door sensors 6
In both 0 and 61, the light beams are constantly emitted from the optical sensors 60M and 61M toward the reflection plates 60L and 61L,
The light beam can be cut off by placing a hand at an intermediate position, and the sensor output signal can be turned on.

Further, in the telephone box 1 of this embodiment,
A switch 62 for manually opening the door is installed. The manual door open switch 62 is a detection means for detecting the opening operation when the user manually opens the folding door 17 without knowing that the door is an automatic opening / closing door.

The switch 62 for manually opening the door is a limit switch in this embodiment, and is fixed at a position in contact with the left vertical column 13 near the entire upper surface of the left side wall 27 of the box, as shown in FIGS. ing. The switch 62 includes a switch main body 62a attached to the left side wall 27 via a mounting bracket 63, and a leaf spring operating piece 62b extending from the switch main body 62a for turning on and off the switch main body 62a.
An operating wheel 62ba protruding from the tip of the operating piece 62b is arranged so as to face the gap between the left vertical column 13 and the large door 19.

An urging lever 64 is attached to a predetermined position near the switch 62 for manually opening the inside of the large door 19, and the urging lever 64 is used for opening and closing the switch 6 when the door is opened and closed.
It is designed to come into contact with the second operating wheel 62ba. When the operating wheel 62ba is not in contact with the biasing lever 64, the operating wheel 62ba takes the operating state shown by the solid line in FIG. 10 (switch 62 = off).
When the door is opened (when the large door 19 is opened), the operating piece 62b is pushed by the urging lever 64 to take the operating state of the virtual line OP in FIG. 10, and the switch 62 = on. On the other hand, when the door is closed (when the large door 19 is closed), the operating wheel 62ba touches the urging lever 62 to take the operating state of the virtual line CL in FIG. 10, but the operating piece 62b is removed from the main body 62a. The switch 62 remains off because it only urges it away.

A handle 67 is provided at a position on the lower left side of the large door 19 of the telephone box 1 so that it can be manually opened / closed when automatic opening / closing does not work due to a power failure.

Further, FIG. 11 shows a block diagram of a control system for automatically opening and closing the door. As a component forming the center of this control system, the automatic door apparatus of this embodiment includes a controller 70 incorporating a microcomputer system.
In addition to the proximity switch 44 described above, the controller 70 is supplied with the switch signals and sensor signals of the outer door sensor 60, the inner door sensor 61, and the manual door opening switch 62. The controller 70 controls the rotation state of the electric motor (torque motor) 31 described above by performing software processing shown in FIG. 12 described later. The controller 70 does not necessarily have to be configured by software processing by a microcomputer,
It may be sequence processing using a relay circuit or the like. Although not shown in the controller 70, the electric motor 31
A drive circuit for driving the and reversible operation circuit are also installed.

Next, the operation of the automatic door apparatus of this embodiment will be described with reference to FIG. The controller 70 performs the software processing shown in FIG. 12 while the power is on.

Now, it is assumed that the user is not using the telephone in the telephone box 1 and the folding door 17 is closed. In this state, the low-speed operation (restraint operation) in the predetermined direction corresponding to the door "closed" instructed by the controller 70 to the electric motor (torque motor) 31 is continued (step S1). By continuing this low speed operation, the closed state of the folding door 17 is restricted, and the "closed" state of the folding door is stabilized against vibration and the like. It should be noted that the motor 31 is in a state of generating torque to rotate during the low speed operation (actually, the motor 31 does not rotate in the completely closed or opened state), but the voltage applied is low, so The motor 31 does not burn out.

In the closed state of the folding door 17, the controller 70 reads the sensor signal of the outer door sensor 60 and determines whether or not the sensor 60 is on (step S2,
S3). When the user touches a predetermined position on the front surface of the telephone box with his / her hand to cut off the light beam, the sensor 60 is turned on. In this case, therefore, it is determined that the user is present, and the process of step S6 described later is performed. If there is no user and the light beam of the outer door sensor 60 is not blocked, step S
Since the determination of No. 3 is NO, the controller 70 then sequentially reads the switch signals of the manual door-opening switch 62 in steps S4 and S5 to determine whether the switch 62 = on. The process for the switch 62 for manually opening the door is a situation in which the user tries to manually open and close the handle 67 without knowing (or forgetting) that the folding door 17 of the telephone box 1 is an automatic opening / closing type. Is to deal with.

That is, when the user does not manually open the folding door 17, a negative determination is made in step S5, and the process returns to step S2. On the other hand, the user has a folding door 17
When the door is manually opened, the large door 19 and the small door 18 move to the right side in FIG. 1 while rotating slightly. At this time, since the urging lever 64 of the large door 19 urges the tip of the operating piece 62b of the switch 62 for manual door opening in the switch-on direction, the operating wheel 62ba is in the state shown by the phantom line OP in FIG. 62 = turn on Since this switch 62 = on state is recognized in step S5, the folding door 17 is instructed to open the door 17 in step 6.

In step S6, a current corresponding to the door opening direction is supplied from the controller 70 to the electric motor 31 through the reversible operation circuit. As a result, the electric motor 31 rotates in a predetermined direction, and the speed of the electric motor 31 is converted into an appropriate speed by the speed reducer 32. At the time of this proper rotation, in the coupling 33 with a clutch, the steel balls B1 to B4 are usually the grooves M.
1 to M4 and are pressed by the set pressure by the spring force of the springs S1 to S4 (see FIG. 8A), the steel balls B1 to B4 and the grooves M1 to M2 are caught by the housing 51. The base body 50 rotates integrally. That is, the rotation of the speed reducer 32 is transmitted through the clutch-equipped coupling 33 as it is, and is transmitted from the knob 50a of the base body 50 to the rotary shaft coupling 34. Since the rotary shaft coupling 34 is fixed to the small door 18 of the folding door 17, the small door 18 rotates in the direction of D in FIG. 2 and is urged by this to move the large door 19 to E in FIG. Move and rotate in the direction of. As a result, the folding door 17 is folded at a constant speed as shown by the phantom line in the figure, and the door is opened.

During the opening operation of the folding door 17, the controller 70 waits while reading the switch signal of the proximity switch 44 in step S7 of FIG. 12 and determining in step S8 whether or not the switch signal is ON. . Immediately before the folding door 17 is fully opened, the proximity switch 44 detects the closest approach of the magnet 43 fixed to the output shaft 32a of the speed reducer 32. Therefore, the controller 70 performs YE in step S8.
Judge as S.

As a result, the process proceeds to step S9. That is, the electric motor 31 is braked, and then a low speed rotation operation (constraint operation) in the door opening direction is commanded. Due to the low speed operation, the folding door 17 is continuously applied with a force in the folding direction, so that the open state of the folding door 17 is restricted. Therefore, the situation that the folding door 17 that has been opened is closed due to wind pressure, vibration, etc. is eliminated.

Thereafter, the controller 70 counts the elapsed time after opening the folding door 17 in step S10 while maintaining the restrained operation, and determines in step S11 whether or not the elapsed time has reached the set time value. stand by. Since this set time is set appropriately, even a wheelchair user can slowly enter the box.

When this set time is completed, the controller 70 shifts to the processing of step S12, and this time, the electric current in the direction corresponding to the door closing direction is supplied to the electric motor 31. As a result, the electric motor 31 rotates in the opposite direction, and the speed reducer 32 reduces the rotation speed to an appropriate speed. The clutched coupling 33 is usually its housing 5
Since 1 and the base body 50 are integrally engaged with each other at the set pressure as described above, the decelerated reverse rotation is transmitted as it is to the rotary shaft coupling 34 via the coupling 33 with a clutch. As a result, the small door 18 and the large door 19 of the folding door 17, which has been open until then, rotate and rotate / move at a constant speed in the D ′ and E ′ directions of FIG. 2, respectively.
The entire folding door 17 is closed.

During this closing operation, the controller 70 waits while repeatedly reading the switch signal of the proximity switch 44 and determining whether the switch signal is ON (steps S13 and S14). Just before the folding door 17 is completely closed on the flat plate, the magnet 43 is located at the farthest distance,
In step S14, it is determined that the proximity switch 44 = OFF.

Immediately after this determination, the process proceeds to step S15, and the electric motor 31 is continuously instructed to perform the low speed operation (restriction operation) in the rotation direction corresponding to the folding door closing direction. By this low speed operation, the closed state of the folding door 17 is stabilized against wind pressure, vibration and the like.

After that, the process of the controller 70 returns to step S2 again, the sensor signal from the outer door sensor 60 or the inner door sensor 61 is read, and in step S3 it is determined whether the sensor signal is ON or not, as described above. To be judged.
Therefore, when the user, who has finished using the telephone (not shown), touches a predetermined position on the wall surface so as to block the light beam of the inner door sensor 61 inside the telephone box 1, the folding door 17 is automatically moved as described above. It automatically opens and closes automatically after a predetermined time. The user can leave the telephone box 1 during this predetermined time.

In this way, the user can touch the telephone box 1 at a predetermined position and the folding door 17 automatically opens and closes. Therefore, the user can save time and enter the telephone box 1 easily. . This provides a telephone box that is very easy to use even for elderly people and wheelchair users, and meets the needs of a highly welfare society.

The user can also use the folding door 1 of the telephone box 1
For example, forgetting that 7 is an automatic opening / closing type (without noticing it), try to open it by holding the handle 67, for example. In this case, since the switch 62 for manually opening the door operates as described above with a slight displacement of the large door 19 in the initial stage of the manual door opening operation, the folding door 17 is removed through the processing of steps S4 to S6 of FIG. As with the normal automatic door opening, it is automatically opened for emergency evacuation, leading to restricted operation in the opening direction. For this reason, the situation in which the user applies excessive force by forcibly opening the folding door 17 of the automatic opening / closing type manually is eliminated. Since the electric motor 31 operating in the closing direction in the restraint operation does not need to exert an excessive force in the opposite direction, the gear of the speed reducer 32 may be damaged or the electric motor 31 may be burned due to overload. This is also prevented.

By the way, as described above, it is assumed that the folding door 17 is impacted by a violent act such as kicking the folding door 17 or hitting the body. When the folding door 17 is closed, as described above, the electric motor 31 always operates at a low speed in the direction corresponding to the closing direction, and the load is always applied in that direction.

Therefore, the impact force to open the folding door 17 is large, and the spring force of the spring S1 (to S4) and the locking force between the groove M1 (to M4) and the steel ball B1 (to B4). It is assumed that the set limit determined by is exceeded. By this impact force,
The steel balls B1 to B4 jump out from the grooves M1 to M4 in which they have fallen, and as shown in FIGS.
Get on 0U (see FIG. 8 (b)). In this case, many
The steel balls B1 to B4, which are urged by the rotation of the electric motor 31 in the direction corresponding to the door closing direction and have run onto the contact surface 50U, roll to the next grooves M2, M3, M4, M1 (see FIG. 14), The springs S2, S3, S4 and S1 are pressed and locked again by falling into the grooves M2, M3, M4 and M1 respectively.

However, when the steel balls B1 to B4 that have once run onto the contact surface 50U stop on that surface,
The original rotation of the electric motor 31 accompanying the next door opening caused by turning on the outer door sensor 60 or the manual door opening switch 62 returns to the original grooves M1 to M4 (see FIG. 15).

When the impact force due to kicking is weaker than the set limit, the steel balls B1 to B4 attempt to jump out of the grooves M1 to M4, and ascend to the middle of the grooves M1 to M4 as shown in FIG. Instead, it returns to the original grooves M1 to M4 as the impact force disappears.

When the impact force is applied to the folding door 17 as described above, the impact force is well absorbed in the clutch-equipped coupling 32 due to the movement of the steel balls B1 to B4 regardless of the magnitude of the impact force. , Reducer 32 and electric motor 3
It does not reach 1. For example, when the folding door 17 is kicked out from the outside as much as possible, the folding door 17 makes an idle rotation by an angle corresponding to the force thereof and then immediately returns to the closing direction by the restraint operation in the closing direction. At this time, the base body 50 of the clutch-equipped coupling 32 rotates relative to the housing 51, and each time the kicking is performed, the steel balls B1 to B4 rotate and move to the next groove Mn, respectively, and the impact force thereof is absorbed. It Be sure to use the spring S1 after the impact force is absorbed or at the initial stage when the door is normally opened.
Since the original clutch function by S4 is realized, it is possible to immediately respond to the above-described normal door opening.

Therefore, even when a large impact force is applied to the folding door 17 from the outside, the gear of the speed reducer 32 and the electric motor 31 are not damaged unlike the conventional case.
Further, the grooves M1 to M in the coupling 32 with a clutch
Since 4 are installed at equal angles of 90 ° here, the coupling with clutch 3 is provided each time a large impact is applied.
3 also rotates by 90 °, so the small door 18 of the folding door 17
The rotation angle of the base body 50 of the clutch-equipped coupling 33 and the positions of the grooves M1 to M4 most appropriately match with each other, the amount of movement of the steel ball after absorbing the impact force is minimized, and the clutch state is restored. Be quick. Further, the wear of the grooves M1 to M4 is averaged, and the wear locally concentrated can be eliminated, so that the service life of the coupling 33 with a clutch can be extended.

Although the controller 70 of the above-described embodiment has a configuration in which the open-time maintaining time during the normal opening / closing operation of the folding door 17 is set in advance by a program, the user's "insertion" inside and outside the telephone box, For example, another optical sensor for detecting the “out” may be provided, and the open state maintenance control may be performed in accordance with the detection signal of this sensor.

Further, the telephone box 1 of the above embodiment is provided with the outer door sensor 60 and the inner door sensor 61 which are operated by being urged by the user's touch to a predetermined position. A direct contact switch may be provided, or a pressure sensor that detects the weight of the user to determine whether it is entering or exiting, a light sensor that shuts off the light beam by the user, or uses light reflection to determine whether it is entering or exiting. May be.

Further, the door of the telephone box to which the automatic door device of the present invention is applied is not necessarily limited to the folding door,
It may be an opening door, a revolving door, or a sliding door. Further, the groove provided in the clutch-equipped coupling does not necessarily have to be 90 °, but may be, for example, a coupling in which the steel balls are moved at three positions of 120 °. Furthermore, the manual door open detecting means of the automatic door apparatus of the present invention is not limited to the limit switch, and for example, a pressure sensor provided on the door handle and for detecting the grip of the user, between the door and the box fixing portion. It may be a magnetic sensor, an optical sensor, or the like that is provided and detects the separation of the door from the fixed portion.

[0061]

According to one aspect of the automatic door device for a telephone box of the present invention, an excessive opening force exceeding the set limit is applied to the door from outside the telephone box between the power conversion means and the opening / closing drive source. Since it is equipped with an excessive opening force absorbing means composed of, for example, a coupling with a clutch, the opening force is absorbed when the door is kicked, even if the door is kicked from the outside or is used abnormally. Since the resulting force is absorbed by the excessive opening force absorbing means, it does not reach the opening and closing drive source such as an electric motor or a speed reducer, which can prevent gear damage of the speed reducer and failure of the electric motor, and has high durability and long life. It is possible to provide a long-life automatic door device for a telephone box.

According to another aspect of the automatic door device for a telephone box according to the present invention, when the door is manually opened, the manual door opening detecting means and the evacuation automatic door opening means
Since the door is automatically opened for emergency evacuation, it is possible to prevent the situation where a user who does not recognize that it is an automatic door system applies excessive force to the door that does not open easily. It is possible to provide an automatic door device for a telephone box, which has a high durability and a long service life because it can prevent damage to the gear of the reduction gear and failure of the electric motor without excessive force being applied to the opening / closing drive source.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a folding door type telephone box according to an embodiment to which an automatic door device of the present invention is applied.

FIG. 2 is a schematic view taken along line II-II in FIG.

FIG. 3 is a side view showing the suspension vehicle main body along the line III-III in FIG. 1.

FIG. 4 is a side view of the suspension vehicle main body as seen from the IV direction in FIG.

FIG. 5 is a front view showing a mounted state of the motor unit.

FIG. 6 is an explanatory diagram for explaining each element of the motor unit and a connection relationship between the elements.

FIG. 7 is a plan view illustrating a mounting position of a motor unit.

FIG. 8 is a cross-sectional view of a coupling with a clutch, (a) showing a state with a clutch function, and (b) showing a state without a clutch function.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 8;

FIG. 10 is a view showing a mounted state of a limit switch as a switch when manually opening a door.

FIG. 11 is a control block diagram of the automatic door device.

FIG. 12 is a flowchart showing an example of a control flow of the controller.

FIG. 13 is a diagram illustrating a moving state of a steel ball when an impact force is applied.

FIG. 14 is a partial cross-sectional view illustrating a moving state of a steel ball when an impact force is applied.

FIG. 15 is another partial cross-sectional view explaining the moving state of the steel ball when an impact force is applied.

FIG. 16 is another partial cross-sectional view explaining the moving state of the steel ball when an impact force is applied.

[Explanation of symbols]

 1 Telephone Box 17 Folding Door 18 Small Door 19 Large Door 30 Motor Unit 31 Electric Motor 32 Reducer 33 Coupling with Clutch 34 Rotating Shaft Coupling 44 Proximity Switch 50 Base Body 51 Housing 60, 61 Outside, Inside Door Sensor 62 Manual Open Door switch 70 Controller S1 to S4 Spring B1 to B4 Steel ball M1 to M4 Groove

Claims (7)

[Claims] 1. An automatic door device for a telephone box that automatically opens and closes a door of a telephone box, wherein an opening and closing drive source for generating power for opening and closing the door, and an opening and closing drive source attached to the door. Power conversion means for converting the generated power into the opening / closing operation of the door, and an excessive opening force which is interposed between the power conversion means and the opening / closing drive source and is outside the telephone box and which is equal to or more than a set limit is applied to the door. An automatic door device for a telephone box, comprising: an excessive opening force absorbing means for absorbing the opening force when applied. 2. The excessive opening force absorbing means is attached to the power converting means and is rotated by being urged to rotate.
A fixed part attached to the opening / closing drive source and abutting on the rotary part, and a pressing member interposed between the fixed part and the rotary part and pressing both the fixed part and the rotary part with each other at a predetermined pressure. The pressing member has a plurality of springs, one end of which is locked to the fixed body, and a steel ball, which is locked to the other end of each of the plurality of springs. The automatic door device for a telephone box according to claim 1, which is a coupling with a clutch having a structure in which a plurality of recesses for individually immersing a part of the plurality of steel balls are provided on a contact surface with respect to a fixed portion. 3. The door is a folding door having a structure in which two opening / closing bodies are connected to each other via a hinge, and when the doors are opened, the two opening / closing bodies are each rotated by 90 ° in different directions. 3. The automatic door device for a telephone box according to claim 2, wherein the pressing member and the recessed portion are provided in four sets on the contact surface and are spaced apart from each other by 90 degrees. 4. The excessive opening force absorbing means detects a manual opening detecting means for manually opening the door, and the manual opening detecting means detects a manual opening of the door. The automatic door device for a telephone box according to claim 2, further comprising an evacuation automatic door opening means for automatically opening the door from its closed state. 5. The manual door opening detection means is a limit switch installed at a predetermined position of the telephone box which is biased by the opening / closing operation of the door, and the limit switch is operated by the operation of the limit switch. 5. The automatic door device for a telephone box according to claim 4, wherein the automatic door device for a telephone box is mounted so as to generate a switch signal change when the door is opened only when the door is opened. 6. The automatic door device for a telephone box according to claim 2, wherein the opening / closing drive source includes an electric motor and a speed reducer that reduces the rotation speed of the electric motor. 7. The automatic door device for a telephone box according to claim 1, further comprising a restraining operation means for restraining a closed state and an open state of the door when the door is closed and when the door is opened.