JPH0222835B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is an improvement of a vehicle door opening/closing device that automatically opens and closes the door by operating a door opening/closing operation switch, and in particular further improves safety for passengers. Regarding improved technology.

Such door opening/closing devices are often used in one-man cars and the like, and the door is opened and closed by a driver located at a distance from the door. Therefore, unlike those for general buildings, the person who opens and closes the door and the person who gets on and off the door, that is, the passenger, are two different people, and the state of boarding and alighting must be ascertained through mirrors, etc. For these reasons, safety measures are extremely important, especially for passengers during boarding and alighting.

Conventionally, this type of safety measure has been to install a detection switch such as a door switch, phototube switch, or pine switch at the boarding/exit area to detect whether a passenger is getting on or off.When this detection switch is activated, (1) the door is closed; (2) A door that automatically flips and opens, or (2) a door that closes completely but warns the driver when this happens.
Furthermore, as an improvement on these, (3) when the detection switch is activated, the supply and discharge of pressure fluid to the actuator for opening and closing the door is stopped to stop the door (Japanese Patent Laid-Open No. 54-159923 (see publication)
etc. are known.

Type (3) solves the problem of item (1), in which passengers on the inside of the steps may be caught by the opening door, and problem (2), in which passengers or luggage getting on and off the stairs may be caught in the door. These technologies were proposed to solve each problem.

However, even in the case of item (3), there is a possibility that the door may stop with the passenger or baggage pressed against it, and in that case, the passenger may have to remove the trapped body or baggage on their own. It turns out that there is a problem with not being able to do this. This is because, although the door stops halfway, a large force is applied to the door from the door opening/closing actuator even in that state.

Therefore, it is an object of the present invention to not only prevent passengers from being caught in the door by turning it over or closing it completely, but also to enable passengers who are boarding or disembarking to open the stopped door by themselves. An object of the present invention is to provide a door opening/closing device for a vehicle.

In order to achieve such an object, in the present invention, a specific emergency valve is provided between the door opening/closing actuator and a pressure source that supplies pressure fluid to the door opening/closing actuator, so that the detection from the detection switch is provided. The device is characterized in that, when a signal is received, both of the two working chambers of the door opening/closing actuator are opened to the atmosphere. This not only makes it possible to stop the door halfway, but also allows passengers who are getting on and off the train to easily open the stopped door on their own and get on and off the train, without the driver having to operate the open/close switch. It will be done.

Hereinafter, the content of the present invention will be made clear by describing embodiments shown in the drawings.

[First embodiment shown in FIG. 1] FIG. 1 is an example in which a differential cylinder is used as a door opening/closing actuator. Reference numeral 1 indicates a differential cylinder, and inside a barrel 2 of the differential cylinder 1, two working chambers 4 and 5 are formed with a piston 3 as a boundary.
Compressed air is supplied to each working chamber 4, 5 from ports 6, 7 on the head side and bottom side. Since the piston rod 8 extends to the head side, there is a corresponding difference in pressure receiving area between the working chambers 4 and 5. A door (not shown) of a one-man car, etc. is connected to one end of the piston rod 8, and when the piston 3 moves in the direction of arrow C in the figure, the door closes, and conversely, when it moves in the direction of arrow O, the door opens. .

The differential cylinder 1 has two systems: a supply system for supplying compressed air to each of the working chambers 4 and 5, and a control system for controlling supply and discharge of compressed air. activated.

The supply system includes an air compressor 9 which is a pressure source;
An air reservoir 11 connected to the air compressor 9 via a check valve 10, and a manual operation cock 1
2, and a meter-in circuit 15 that adjusts the flow rate to each working chamber 4, 5 using the check valve 13 and the throttle 14;
It also includes a conduit 16 that connects each element.

On the other hand, the control system includes two single solenoid type electromagnetic valves 17 and 18. One solenoid valve 17 is a switching valve that switches and controls the supply and discharge of compressed air to the working chamber 4, and the other solenoid valve 18 is the aforementioned emergency valve that opens both the two working chambers 4 and 5 to the atmosphere. .

The switching valve 17 is provided between the bottom side port 7 of the differential cylinder 1 and the meter-in circuit 15, and is operated by operating a door opening/closing switch 19 near the driver's seat. The operating switch 19 includes a fixed closing contact 191 and an opening contact 192, and a movable operating lever 193. When the movable operating lever 193 of the operating switch 19 is tilted toward the closing contact 191 as shown in the figure, the solenoid 171 of the switching valve 17
is in the off state, and the valve spool is pushed upward by the force of spring 172.
Therefore, in that case, the conduit 16 is connected to the lower block 17d, and compressed air is supplied not only to the left-hand working chamber 4 but also to the right-hand working chamber 5, so that both working chambers 4, 5 are supplied with compressed air. As a result, the door is closed due to the difference in pressure receiving area.

On the other hand, the operation lever 1 of the door opening/closing operation switch 19
93 to the open contact 192 side, contrary to the case shown, the current from the battery 20 flows into the operating circuit 21.
to the solenoid 171 of the switching valve 17. Thereby, the solenoid 171 is energized, and its electromagnetic force overcomes the force of the spring 172, causing the solenoid 171 to move the spool downward.
In that case, the line 16 is connected to the upper block 17u, and the right working chamber 5 is opened to the atmosphere through port 7 and the exhaust port 173 of the upper block 17u. Then, the piston 3 of the differential cylinder 1 moves toward the arrow O side and opens the door. The operating circuit 21 includes known relay switches for switching valves, door opening/closing confirmation lights, warning buzzers, etc., and the line 22 is directly connected to the switching valve 17. This is also a well-known device for supplying power to unrelated door opening/closing confirmation lights, warning buzzers, etc.

Next, the emergency valve 18, which is the key point of this invention, is provided between the meter-in circuit 15 and the manual operation cock 12, and is normally pushed upward by the force of the spring 182. and the conduit 16 is connected to the lower block 18d. This emergency valve 18 is operated based on a detection signal from a known detection switch 23 such as the above-mentioned door switch, phototube switch, or matto switch. Operating circuit 24
The signal is inputted to the solenoid 181 of the emergency valve 18 via.

If a passenger getting on or off the vehicle gets caught in the door while the door is closing, the detection switch 23 detects this and outputs a detection signal to the operating circuit 24. As a result, a relay switch (not shown) in the operating circuit 24 closes and energizes the solenoid 181 of the emergency valve 18. As a result, the electromagnetic force overcomes the force of the spring 182, causing the solenoid 181 to move the spool downward. Then, the compressed air in each of the working chambers 4, 5 is released to the atmosphere through the check valve 13 with low resistance and the exhaust port 183 of the upper block 18u of the emergency valve 18. Therefore, the door stops when the piston 3 stops halfway, and since both working chambers 4 and 5 are open to the atmosphere, a passenger caught in the door cannot open the stopped door. The vehicle can be opened by itself and passengers can get on and off the vehicle without waiting for the driver to operate the door opening/closing switch 19. In addition, the operating circuit 2
4 also includes a timer, and the emergency valve 18 is returned to its original state by the force of the spring 182 after a certain period of time, and the door is automatically closed. In that case, emergency valve 1
Since the meter-in circuit 15 is located downstream of the door 8, the door can be closed gently.

[Second Embodiment Shown in FIG. 2] FIG. 2 is an example in which a double-acting cylinder is used as a door opening/closing actuator. Reference numeral 201 is a double-acting cylinder, and in this example, a 4-port solenoid valve 217 is used as a switching valve depending on the difference in actuator, and a double-acting cylinder is used when switching from open to close or vice versa. This embodiment is the same as the first embodiment shown in FIG. 1, except that the meter-in circuit 15 is removed in order to improve the responsiveness of the cylinder 201. Therefore, regarding this second embodiment, the same constituent parts as those in FIG. 1 are designated by numerals with 200 added to the reference numerals in FIG. 1, and their explanations will be omitted.

In the above embodiment, a linear type actuator 1, 201 is used as the door opening/closing actuator, but an oscillating or rotating type actuator may also be used.

Further, in the above embodiment, compressed air is used as the working fluid, but the present invention can also be applied to a case where hydraulic pressure is used. In that case, opening the two working chambers to the atmosphere means opening the two working chambers to the atmosphere. It means opening to the reservoir.

Furthermore, in the embodiment, the emergency valve 18, 218
Although a solenoid valve that moves the spool using electromagnetic force is used, a valve that moves the spool mechanically using a link mechanism may also be used.

As described above, in the present invention, specific emergency valves 18, 2 are provided between the door opening/closing actuator 1, 201 and the pressure source 9 that supplies pressure fluid thereto.
18, it is possible not only to stop the door midway, but also to allow passengers to open the stopped door by themselves, thereby further improving safety for passengers.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a first embodiment of the invention, and FIG. 2 is a circuit diagram of a second embodiment of the invention. 1,201...Door opening/closing actuator, 4,
5,204,205...Working chamber, 9...Air compressor (pressure source), 11,211...Air reservoir, 17,217...Switching valve, 18,218...
...Emergency valve, 19,219...Door opening/closing operation switch, 21,24,221,224...Operating circuit,
23,223...Detection switch.

Claims (1)

[Claims] 1. A door opening/closing operation switch that opens and closes a vehicle door by its operation; a door opening/closing actuator that has two working chambers and operates by supplying and discharging pressure fluid from a pressure source to at least one of the working chambers; A vehicle door opening/closing device comprising a switching valve that is activated by the operation of a door opening/closing operation switch and switches and controls supply and discharge of pressure fluid to the working chamber, and a detection switch that detects when a passenger gets on and off the vehicle, wherein the detection switch An emergency valve is provided between the pressure source and the door opening/closing actuator to open the two working chambers of the door opening/closing actuator to the atmosphere in response to a signal from the door opening/closing actuator.