JPH0316474B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic door opening/closing device installed at entrances and exits of buildings.

Conventionally, when attempting to pass through an entrance or exit where an automatic door is installed, a passerby is detected and an open signal is given to the closed door until the door is actually opened to allow passage. During this period, you must temporarily wait at the entrance or exit. However, if you wait temporarily every time you pass through the door, if you enter and leave the building many times through the automatic door, for example, if you are transporting luggage, the automatic door will not be able to stop you from passing through. There was a risk of becoming a hindrance. In addition, when passersby continuously enter and exit through the automatic door, the drive device must be kept in operation in order to keep the automatic door open and in the open position for a long time. .

Therefore, the present invention was made in view of the above circumstances, and normally has a function of detecting a passerby, automatically opening the door based on the detection signal, and automatically closing the door after passing. When the door needs to be left open temporarily, such as when people are coming in and out, or when transporting cargo, the door can be opened manually and temporarily held in that open position. The purpose of the present invention is to provide an automatic door opening/closing device that has the functions of: The technical means to achieve this purpose is to slidably insert a piston with a rack into the cylinder, engage this rack with a pinion that is linked to the opening and closing of the door, and press the piston in one direction at all times. A spring chamber with internal pressure for a return spring and a cylinder chamber in which pressure oil is supplied and discharged against this return spring are formed, and a pump and an oil tank are connected to this cylinder chamber via a switching valve, and the spring chamber and the oil tank are connected. In the automatic door opening/closing device, when the piston is positioned before the final stroke end position due to the supply of pressure oil to the cylinder chamber and the door is opened at a predetermined angle, the cylinder chamber and the oil tank are connected. A hydraulic discharge passage with a throttle valve is provided, and a door is connected to the rotating shaft of the pinion via a link mechanism, and when the door is manually opened at a predetermined angle or more and the piston is moved to the final stroke position, the door is opened. The link mechanism is provided with a stop device for holding it in the open position.

According to this technical measure, the piston is normally moved against a return spring by means of the pressure oil supplied to the cylinder chamber to automatically open the door. When the piston moves to a position before the final stroke end position and the door is automatically opened to a predetermined angle, the pressure oil in the cylinder chamber is discharged to the oil tank via the hydraulic discharge passage with a throttle valve, and the cylinder chamber Since the pressing force of the hydraulic pressure and the repulsive force of the return spring are balanced, the door is held open at a predetermined angle. When pressure oil is no longer supplied to the cylinder chamber, the piston is moved by the repulsive force of the return spring and the door is automatically closed. In addition, if it is necessary to temporarily open the door, the door can be manually opened at a predetermined angle or more, the piston can be moved to the final stroke position, and the stop device of the link mechanism can be moved. The door can be left open temporarily.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings.

Figures 1 and 2 show external views of a door using the automatic door opening/closing device of the present invention, in which 1 is a door that is rotatable around a hinge 2, and 3 is a closed door at the top of the door 1. The fixed door opening/closing device 4 is a link mechanism consisting of a drive arm 5 and an adjusting arm 6. One end of the driving arm 5 is fixed to the rotating shaft 7 of the door opening/closing device 3, and the adjusting arm 6 is connected to the rotating shaft 7 of the door opening/closing device 3. The other end and a mounting bracket 8 fixed to the door 1 are rotatably connected.

FIG. 3a shows the structure of the door opening/closing device 3, in which a pump 10, an oil tank 11, a switching valve 12, and a cylinder 13 are integrated into a main body 9.

The pump 10 is operated by driving and stopping a motor (not shown), and the suction side is connected to a passage a.
The outlet side is connected to the oil tank 11 through a passage b, and the outlet side is connected to a switching valve 12 through a passage b.

The switching valve 12 is a shuttle valve that moves downward by the hydraulic pressure exerted from the pump 10 and moves upward by the pressure oil from the cylinder chamber 19, which will be described later. The cylinder chamber 19 is communicated with the oil tank 11 and the communication with the oil tank 11 is cut off, and when moving upward, the cylinder chamber 19 is communicated with the oil tank 11 and the communication with the pump 10 is cut off.

In the cylinder 13, a piston 15 having a rack 14 is slidably inserted into the main body 9, and a pinion 16 directly connected to the rotating shaft 7 shown in FIG. A spring chamber 18 with internal pressure of a return spring 17 that presses the return spring 17 and a cylinder chamber 19 in which pressure oil is supplied and discharged against the return spring 17 are formed. Between this cylinder chamber 19 and the switching valve 12, a check valve 21a, a throttle valve 22a,
23a, and a check valve 21 is connected between the spring chamber 18 and the oil tank 11.
b by a hydraulic pressure supply/discharge passage 20b having throttle valves 22b, 23b. This throttle valve 22d,
Reference numeral 22b is for speed adjustment, throttle valves 23a and 23b are for cushion adjustment, and a hydraulic pressure supply/discharge passage 20b having a check valve 21b is provided at the rear end of the piston 15. The oil pressure supply/discharge passage 20b is provided with an oil chamber 24 that receives the pinion 16, and a passage 25 connected to the switching valve 12 is connected to this oil chamber 24. Further, a hydraulic discharge passage 26 having a throttle valve 26a is connected in parallel to the hydraulic pressure supply/discharge passage 20b between the oil tank 11 and the oil chamber 24. This hydraulic discharge passage 26 has a door 1 shown in FIG.
90°) and when the piston 15 reaches the nearer position at the final stroke end position, the throttle valve 26a
This movement throttles the hydraulic pressure in the cylinder chamber 19 while discharging it into the oil tank 11, and balances the pressing force of the hydraulic pressure generated in the cylinder chamber 19 with the repulsive force of the return spring 17 to hold the piston 15 in its position. do. In other words, the piston 15 does not move to the final stroke end position as shown in FIG. 3b, but leaves an extra stroke amount S. Note that the passage 27 provided at the front end of the piston 15 allows the oil layer 11 and the oil chamber 2 to be opened when the door 1 is manually opened.
4. This is for sucking oil in the spring chamber 18 into the cylinder chamber 19 through the check valve 27a.

FIG. 4 shows the structure of the stop device 28 provided on the link mechanism 4. As shown in FIG. This stop device 28 is
It is provided between the drive arm 5 and the adjustment arm 6.

In the figure, the shaft core portion 29 is fixed to the drive arm 5 with mounting bolts 30, 30, the adjustment arm 6 is rotatably inserted into the shaft core member 29, and a cam plate 31 is attached to the lower part of the shaft core member 29. is attached by an adjustment bolt 32. The cam plate 31 has a recess 31b (fifth part) into which the roller 36 on the adjustment arm 6 side is inserted when the door 1 is opened at a predetermined angle (approximately 90°) or more.
(see figure), and has a serration 31a on its upper surface that engages with the serration 29a of the shaft core member 29. On the other hand, a spring 35 supported by a receiving member 34 is inserted into the case 33 of the adjustment arm 6, and a push piece 37 that rotatably supports the roller 36 is slidably inserted. 3
8 is a pin for preventing the pusher piece 37 from falling out of the case 33 due to the elastic force of the spring 35. Therefore, when the door 1 opens beyond a predetermined angle (approximately 90 degrees) and the drive arm 5 and adjustment arm 6 rotate relative to each other, the roller 36 is inserted into the recess 31b of the cam plate 31.
The rotation of the drive arm 5 and the adjustment arm 6 is restrained by being fitted therein. Also, loosen the adjustment bolt 32 to disengage the serrations 31a of the cam plate 31 and the serrations 29a of the shaft core member 29, set the recess 31b of the cam plate 31 to an arbitrary position, and tighten the cam again with the adjustment bolt 32. By simply fixing the plate 31 and the shaft core member 29, the opening position when the door 1 is opened beyond a predetermined angle can be arbitrarily changed.

Next, the operation of one embodiment of the present invention having the above-described configuration will be explained.

In Fig. 3a, when a passerby is detected and a door open signal is issued, the pump 10 is activated by the drive of the motor, sucks oil from the oil tank 11 from the passage a, and supplies pressure oil to the passage b side. After the pressure oil is discharged and the switching valve 12 is moved downward to cut off the communication between the hydraulic pressure supply and discharge passage 20a and the oil tank 11, the pressure oil from the pump 10 is transferred from the check valve 21a into the cylinder chamber 19. supply to. Then, the piston 1 is moved by the pressure oil in the cylinder chamber 19.
5 moves to the right in the figure against the force of the return spring 17 to drain the pressure oil in the spring chamber 18 to the throttle valves 22b and 23b.
The oil is discharged from the oil tank 11 to the oil tank 11 via the hydraulic pressure supply and discharge passage 20b. Due to the movement of the piston 15, the rack 14
When the pinion 16 engaged with the pinion 16 rotates, the door 1 shown in FIGS. Rotate and move in the opening direction. At this time, the moving speed of the piston 15 in the right direction (the opening speed of the door 1) is determined by the speed adjusting throttle valve 2.
2b. In addition, the door 1 is set at a predetermined angle (abbreviation).
90°), the piston 15 closes the speed adjustment throttle valve 22b, so that the pressure oil in the spring chamber 18 is released only by the cushion adjustment throttle valve 23b. It is discharged into the oil tank 11 from the hydraulic discharge passage 20b while being throttled. In other words, the rightward movement speed of the piston 15 causes the door 1 to open smoothly.

When the door 1 reaches the open position at a predetermined angle (approximately 90°), the piston 15 is positioned before the final stroke end position and opens the hydraulic discharge passage 26, as shown in FIG. The pressure oil in the chamber 19 is throttled by the throttle valve 26a and flows through the oil tank 1 through the oil pressure discharge passage 26 and the oil pressure supply and discharge passage 20b.
1 is discharged. Therefore, due to this evacuation action, the pressing force due to the hydraulic pressure generated in the cylinder chamber 19 and the repulsive force of the return spring 17 are balanced, the piston 15 is held with an extra stroke amount S, and the door 1 is held at a predetermined angle ( 90°) remains in the open position (position 1a in FIG. 2). The opening/closing operation of the link mechanism 4 accompanying the rotation of the door 1 causes the stop device 28 to enter the state shown in FIG. The recess 31b of the cam plate 31 and the roller 36 are not engaged with each other, and the drive arm 5 and the adjustment arm 6 are rotatable relative to each other.

Next, when a passerby passes and there is no signal to open the door, the operation of the pump 10 is stopped from the state shown in FIG. After moving upward and cutting off the communication between the pump 10 and the hydraulic supply/discharge passage 20a, the hydraulic supply/discharge passage 20a is connected to the oil tank 11. Then, the pressure oil in the cylinder chamber 19 is discharged from the throttle valves 22a and 23a through the hydraulic supply passage 20a, from the switching valve 12 through the passage 25, the oil chamber 24, and the hydraulic supply and discharge passage 20b, and is discharged to the oil tank 11. The piston 15 is moved to the left in the figure by the repulsive force of the return spring 17, and the oil in the oil tank 11 and the oil chamber 24 is sucked into the spring chamber 18 from the hydraulic pressure supply/discharge passage 20b via the check valve 21b. Therefore, as the piston 15 moves, the pinion 16 that engages with the rack 14 rotates in the opposite direction to that described above, and the door 1 shown in FIGS. The accompanying opening/closing operation of the link mechanism 4 rotates around the hinge 2 and moves in the closing direction. At this time, the leftward movement speed of the piston 15 (the closing speed of the door 1) is determined by the speed adjustment throttle valve 22a. Furthermore, when the door 1 approaches the fully closed position, the piston 15 closes the speed adjustment throttle valve 22a, so the cylinder chamber 1
The pressure oil 9 is discharged into the oil tank 11 from the hydraulic pressure supply/discharge passage 20a while being throttled only by the throttle valve 23a for cushion adjustment. In other words, the leftward movement speed of the piston 15 drops and the door 1 is closed smoothly. The stop device 28 returns to the state shown in FIG. 5a due to the opening and closing operation of the link mechanism 4 accompanying the rotation of the door 1. In this state, the gum plate 31
The recess 31b and the roller 36 are not engaged with each other, and the pushing piece 37 is brought into contact with the pin 38 by the elastic force of the spring 35. (See Figure 4) In this way, the door 1 is usually moved at a predetermined angle (approximately
Although the door 1 automatically opens and closes up to a predetermined angle (90°), when ventilating the room or transporting cargo, the door 1 can be manually held open beyond a predetermined angle and held temporarily. That is, when the door 1 in the open position (position 1a in FIG. 2) at a predetermined angle (approximately 90°) is manually held and forcibly moved in the opening direction, the rotation axis due to the opening/closing operation of the link mechanism 4 7 is transmitted to the piston 15 via the pinion 16 and the rack 14, and the piston 15 moves by a stroke amount S against the return spring 17 from the state shown in FIG. 3b, and reaches the final stroke end position. Also, at this time,
The opening/closing operation of the link mechanism 4 accompanying the rotation of the door 1 causes the stop device 28 to enter the state shown in FIG. 5c. In this state, the roller 36 energized by the spring 35 fits into the recess 31b of the cam plate 31 and prevents the rotation of the drive arm 5 and adjustment arm 6, thereby restricting the opening/closing operation of the link mechanism 4. The piston 15 is held at the final stroke end position, and the door 1 is held open at a position above a predetermined angle (position 1b in FIG. 2). That is, even if there is an open or close signal due to the passage of a passerby, the door 1 will not close and will continue to be held at a position above a predetermined angle (position 1b in FIG. 2).

After that, if you want to return the door 1 to its normal state, you can manually move it to a position above a predetermined angle (the second position).
The restriction on the link mechanism 4 may be released by forcibly moving the door 1 located at position 1b) in the figure in the closing direction.
That is, when the stop device 28, which is in the state shown in FIG. 5c, is returned to the state shown in FIG. The arm 5 and the adjustment arm 6 can rotate relative to each other, the piston 15 moves to the left from the final stroke end position by the repulsive force of the return spring 17, and the door 1 moves in the closing direction.
At this time, if the door open signal is output, piston 1
5 is moved by a stroke amount S from the final stroke end position and held in the state shown in Fig. 3b, and the door 1 is at a predetermined angle (approximately 90°) position (position 1a in Fig. 2).
is held open. Further, when the door close signal is output, the piston 15 moves from the final stroke end position to the left in the figure by the repulsive force of the return spring 17 and is held in the state shown in FIG. 3a. Note that when the door 1 is manually moved in the opening direction during a power outage, the piston 15 moves to the right in the figure against the return spring 17, and the oil tank 11 The oil in the oil chamber 24 and the spring chamber 18 passes through the passage 27 and flows into the cylinder chamber 19 from the check valve 27a. When the door 1 is released, the piston 15 moves to the left in the figure by the repulsive force of the return spring 17, and the door 1 is automatically closed.

As is clear from the above description, according to the automatic door opening/closing device of the present invention, by supplying pressure oil to the cylinder chamber, the piston is positioned before the final stroke end position, and the door is opened at a predetermined angle. At this time, a hydraulic discharge passage with a throttle valve is provided to connect the cylinder chamber and the oil tank, and a door is connected via a link mechanism to the rotating shaft of a pinion that engages with the piston rack, and the door is manually held at a predetermined angle or higher. When the door is opened and the piston is moved to the final stroke end position, the link mechanism is equipped with a stop device that holds the door in the open position. , the piston moves to a position before the final stroke end position to automatically open and close the door to a predetermined angle, and when the door needs to be left open temporarily, such as when transporting cargo. can be held in the open position simply by manually opening the door beyond a predetermined angle.

[Brief explanation of drawings]

Fig. 1 is an external view of the door using the present invention, Fig. 2 is a plan view of the door, Fig. 3 is a structural diagram of the door opening/closing device of the present invention, and Fig. 3a shows the door in the fully closed position. Fig. 3b shows the state when the door is open at a predetermined angle, and Fig. 3b shows the state when the door is opened at a predetermined angle. FIG. 4 is an enlarged cross-sectional view of the main part of the link mechanism of the present invention, FIG. 5 is an explanatory diagram of the operation of the stop device of the link mechanism, and FIG. Fig. 5b shows the state when the door is opened to a predetermined angle, and Fig. 5c shows the state when the door is opened to a predetermined angle or more. 1, 1a, 1b...door, 3...door opening/closing device, 4
... Link mechanism, 7 ... Rotating shaft, 10 ... Pump, 11 ... Oil tank, 12 ... Switching valve, 13 ... Cylinder, 14 ... Rack, 15 ... Piston, 1
6... Pinion, 17... Return spring, 18... Spring chamber, 19... Cylinder chamber, 20a, 20b...
Hydraulic supply and discharge passage, 26...Hydraulic discharge passage, 26a...
...throttle valve, 28...stop device.

Claims (1)

[Claims] 1 A piston with a rack is slidably inserted into the cylinder, a pinion that is linked to the opening and closing of the door is engaged with this rack, and a spring chamber containing a return spring that constantly presses the piston in one direction and this return In an automatic door opening/closing device that forms a cylinder chamber in which pressure oil is supplied and discharged against a spring, a pump and an oil tank are connected to the cylinder chamber via a switching valve, and the spring chamber and the oil tank are connected. When the piston is positioned before the final stroke end position and the door is opened at a predetermined angle by supplying pressure oil to the pinion, a hydraulic discharge passage with a throttle valve connecting the cylinder chamber and the oil tank is provided. A door is connected to the rotating shaft of the door via a link mechanism, and when the door is manually opened by a predetermined angle or more and the piston is moved to the final stroke position, a stop device that holds the door in the open position is connected to the link mechanism. An automatic door opening/closing device with a door open position holding mechanism.