JPH0781458B2 - Plug door device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug door device, and more particularly, to moving a door in a take-out / draw-in direction with respect to an opening of a vehicle by projecting / retracting movement of a piston rod of an in / out cylinder. With
The present invention relates to a plug door device configured to move a door once taken out in an opening / closing direction along a vehicle side wall by a protruding / retracting movement of a piston rod of an opening / closing cylinder.

[Conventional technology]

Conventionally, the door is moved by both the movement in the take-out / draw-in direction (inside and outside of the vehicle) with respect to the opening of the vehicle and the movement in the opening / closing direction (along the side wall of the vehicle) of the door that intersects with the door. A plug door device configured to be driven is publicly known, and in an attempt to put it into practical use, the applicant of the present invention has proposed a plug door device as described below in a utility model registration application (Japanese Utility Model Application No. 63-151564). The structure of the device and its control device were proposed.

That is, the schematic structure of this plug door device is, as shown in FIG. 20, provided above the opening 2 formed in the vehicle side wall 1 of the vehicle and in the take-out direction of the door 3 (see FIG.
the first guide mechanism 4, 4 for guiding the movement in the b direction),
Second guide mechanisms 5 and 5 are provided that are suspended from the guide mechanisms 4 and that guide the movement of the door 3 in the opening / closing direction (the cd direction in the figure).
The first guide mechanism 4 is fixed to a mounting base (not shown) of the vehicle upper wall portion, and is provided with a guide body 4a disposed at an inclination angle of 45 degrees with respect to the vehicle side wall 1, and the guide body 4a. The second guide mechanism 5 is composed of a slide body 4b held slidably, and the second guide mechanism 5 is held slidably along the guide rail 5a extending parallel to the door 3 and in the horizontal direction. And a pair of sliding pieces 5b, 5b. The brackets 6, 6 are attached to the sliding bodies 4b, 4b of the first guide mechanism 4, 4.
The guide rails 5a of the second guide mechanism 5 are attached via the sliding guides 5b, 5b of the second guide mechanism 5
A door bracket 7 fixed to the upper portion of the door end portion of the door 3 is attached to the door via a guided member 8. The guided member 8 includes a lower door front side member 8a and an upper door rear end side member 8b which are fixedly integrated. Further, an opening / closing cylinder 9 extending in a horizontal direction in parallel with the door 3 is fixedly supported on the mounting base of the vehicle upper wall portion directly below the first guide mechanism 4, 4 via holding brackets 10, 10. This open / close cylinder 9
Tip fitting 11 attached to the tip of the piston rod 9a of
The auxiliary guide roller 12 is supported by the auxiliary guide roller 12, and the auxiliary guide roller 12 is attached to one end portion of the guided member 8 (the right end portion of the upper door end side member 8b) in the front-back direction. It is held so that it can move (inside and outside the vehicle). Further, between the pair of first guide mechanisms 4 and 4, an in-and-out cylinder 14 arranged at an inclination angle of 45 degrees with respect to the vehicle side wall 1 is mounted on a vehicle upper wall part mounting base via a holding bracket 15. It is fixedly supported, and the tip end of the piston rod 14a of the loading / unloading cylinder 14 is connected to the guide rail 5a of the second guide mechanism 5. In addition, in the same figure, the portions marked with parallel diagonal lines show the portions where the vehicle upper wall is fixed to the mounting base.

On the other hand, the control device for controlling the opening / closing cylinder 9 and the inlet / outlet cylinder 14, that is, the fluid supply / discharge circuit, as shown in FIGS. 21 to 23, includes the first conduit 21 and the first conduit 21 communicating with the opening side port 20 of the opening / closing cylinder 9. The second pipeline 23 communicating with the closed port 22, the main pipeline 25 communicating with the fluid pressure source 24, and the first and second pipelines 2
2, 23 has a solenoid valve 26 for selectively switching and connecting the main pipe 25 and the atmosphere opening portion Ex, and the first branch pipe 27 branched from the first pipe 21 is connected to the inlet / outlet cylinder 14. A second branch pipeline 29 connected to the carry-out side port 28 and branched from the second pipeline 23 is connected to the pull-in side port 30 of the loading / unloading cylinder 14, and a limit valve in the middle of the first branch pipeline 27.
31 are installed. As will be described later, the limit valve 31 takes a communication position while the door 3 is moving in the take-out / pulling-in direction and takes a holding position (blocking position) while the door 3 is moving in the opening / closing direction. In the state shown by the solid line in FIG. 20, the roller plunger 31a at the tip of the limit valve 31 is attached to the other end of the guided member 8 (the left end of the lower door end side member 8a). It is compressed by the limit plate 32.

According to the above configuration, when the door 3 is fully closed, the solenoid valve
26 is switched to the position shown in FIG. 21 and the second pipe line 23 is connected to the main pipe line 25, and accordingly, the piston rods of both the opening / closing cylinder 9 and the inlet / outlet cylinder 14 are connected.
9a and 14a are stopped at the retracted end position, so that the plug door device is maintained in the state shown by the solid line in FIG. on the other hand,
When the door 3 is opened, the solenoid valve 26 is switched to the position shown in FIG. 22, and the first pipeline 21 is connected to the main pipeline 25,
Along with this, the piston rods 9a, 14a of both the opening / closing cylinder 9 and the inlet / outlet cylinder 14 project and move while their respective speeds are adjusted by a flow rate adjusting valve (not shown), so that the door 3 and the second guide mechanism 5 move to the first position. 1 Guided by the guide mechanism 4, 4, it is carried out in the direction of FIG. 20a. Then, when the piston rod 14a of the loading / unloading cylinder 14 reaches a predetermined position, that is, when it reaches the moving end in the carry-out direction, the door 3 is in the state shown by the reference numeral (a) in FIG. 20 and the second guide mechanism 5 is The state shown by the reference numeral (b) in FIG. Since the guide rail 5a and the guided member 8 do not move relative to each other when the door 3 is moved out, the roller plunger 31a of the limit valve 31 is kept compressed by the limit plate 32. In this way, after the door 3 moves in the carry-out direction by a predetermined dimension and reaches the moving end in that direction, only the piston rod 9a of the opening / closing cylinder 9 continues to project, so that the second guide mechanism 5 The sliding pieces 5b, 5b and the guided member 8 move in the opening direction along the guide rail 5a,
Along with this, the door 3 also moves in the opening direction (direction c in FIG. 20), but at this time, the limit plate 32 separates from the roller plunger 31a of the limit valve 31, so that this roller plunger 31a is spring-loaded. When the limit valve 31 is projected, the limit valve 31 is switched to the state shown in FIG.
27 is closed. As a result, the pressure fluid in the main conduit 25 is supplied from the first conduit 21 only to the open side port 20 of the opening / closing cylinder 9, and therefore the piston rod 14a of the inlet / outlet cylinder 14 is in a stopped state. When only the piston rod 9a of No. 9 is projecting and reaching the projecting end, that is, when it is in the fully open state, the door 3 moves to the 20th position.
The state shown by the reference numeral (a ') in the figure and the state of the second guide mechanism 5 shown by the reference numeral (b') in the same figure.

On the other hand, when the door 3 is closed, the solenoid valve 26 is first switched from the position shown in FIG. 23 to the other position from the above-mentioned fully opened state, and the pressure fluid in the main pipeline 25 is closed in the closing port 22 of the opening / closing cylinder 9. At the same time, the limit valve 31 of the first branch pipe line 27 and the inlet / outlet cylinder will be supplied to the inlet side port 30 of the inlet / outlet cylinder 14.
14 is closed, and the pressure receiving area of the piston 14b of the loading / unloading cylinder 14 is larger on the carry-out side port 28 side than on the pull-in side port 30 side by the amount corresponding to the axial cross-sectional area of the piston rod 14a. From this, this in-and-out cylinder
The piston rod 14a of 14 is temporarily held in the carry-out position, and only the piston rod 9a of the opening / closing cylinder 9 moves backward to move the door 3 in the closing direction (direction d in FIG. 20). And
When the door 3 reaches the position indicated by the reference numeral (a) in FIG. 20, the roller plunger 31a of the limit valve 31 is changed to the limit plate 32.
The limit valve 31 is pressed and contracted by the switch to the position shown in FIG. 21, whereby the piston rods 9a and 14a of both the open / close cylinder 9 and the in-and-out cylinder 9 are moved backward, which is the reverse of that at the time of carrying out. By this operation, the door 3 and the second guide mechanism 5 move in the retracting direction (direction of FIG. 20b), and when the moving end is reached, the door 3 is fully closed again.

[Problems to be Solved by the Invention]

However, according to the plug door device proposed by the present applicant, when the door 3 moves in the cd direction in FIG. 20,
The limit valve 31 simply shuts off the first branch pipe line 27 so that the piston rod 14
When the door 3 is held in the take-out position, the pressure of the piston 14b of the take-in / take-out cylinder 14 on the take-out side port 28 side and the take-in side port 30 side is received as described above, especially when the door 3 is closed in the direction of FIG. 20d. Since the piston rod 14a is held at the take-out position due to the difference in area, the holding force for holding the door 3 at the take-out position is extremely weak, and some external force acts on the door 3 in the pull-in direction. In this case, the door 3 comes into contact with the side wall 1 of the vehicle. Such a problem is caused by air leakage occurring in a sliding portion between the piston rod 14a of the loading / unloading cylinder 14 and the cylinder tube while the door 3 is held at the take-out position, or between the piston 14b and the cylinder tube. This is further promoted by air leakage or the like that occurs in the sliding portion. Incidentally, in order to avoid such a problem, the diameter of the piston rod 14a of the inlet / outlet cylinder 14 may be increased to increase the difference in the pressure receiving area of the piston 14b described above. According to this, not only new problems such as an increase in the size of the loading / unloading cylinder 14 and a high cost are caused, but also it is extremely difficult to obtain a sufficient holding force for reliably holding the door 3 in the take-out position.

Further, when the door 3 is manually opened / closed without depending on the operation of the fluid supply / discharge circuit as described above (especially in the case of a power failure), it is provided between the fluid pressure source 24 and the solenoid valve 26. By operating a three-way cock (not shown), both the first conduit 21 and the second conduit 23 are opened to the atmosphere, and the piston rods 14a and 9a of the inlet / outlet cylinder 14 and the opening / closing cylinder 9 are projected and retracted by manual operation. In this case, when the door 3 moves in the cd direction in FIG. 20, both the carry-out port 28 side and the pull-in side port 30 side of the piston 14b of the loading / unloading cylinder 14 are in the atmospheric pressure state. Therefore, the fluid pressure for urging the door 3 to the take-out position does not depend on it, and therefore even if only a very small external force acts on the door 3 in the retracting direction, the door 3 becomes unstable and rattles. Etc. occur, same as above Door 3 leading to problems such as contact with the vehicle side wall 1.

Therefore, the present invention focuses on the point that the limit valve of the inlet / outlet cylinder is switch-controlled at the take-out position of the door, and provides a means for reliably holding the door at the take-out position by operating in conjunction with this limit valve. To do this is a technical issue.

[Means for Solving the Problems]

A specific means for achieving the above technical problem is that the door is opened and closed by moving the door in the take-out / retracting direction with respect to the opening of the vehicle and in the opening / closing direction along the vehicle side wall. And a cylinder for moving the door in the take-out / draw-in direction with the guide operation of the first guide mechanism, and a piston rod of the take-in / take-out cylinder that extends in the opening / closing direction and the take-out / draw-in. Direction, a guided member slidably held by the guide rail, movable in the opening / closing direction, and connected to a door, and a direction in which the door is pulled out and drawn in. Holding to switch to the communication position that drives the in-and-out cylinder when moving to and from, and to limit the movement of the in-and-out cylinder when moving in the opening and closing direction In a plug door device provided with a limit valve for switching to a closed position, a lock position for locking and unlocking a piston rod of the in / out cylinder in the vicinity of the in / out cylinder along with its protruding / retracting motion. A lock member for taking the position and a switching means for switching the locked state of the lock member are provided, and the switching means is provided for the guide rail in the vicinity of the door moving from the moving path in the take-out / drawing direction to the moving path in the opening / closing direction. A detection lever that swings as the guided member moves in the opening / closing direction, and a transmission mechanism that converts the swing of the detection lever into a protruding / retracting movement of the lock member,
The limit valve switching operation is included in the configuration.

[Action]

According to the above means, the guided member moves in the opening / closing direction with respect to the guide rail while the door is guided in the take-out / draw-in direction while being guided by the first guide mechanism due to the protruding / retracting movement of the piston rod of the in / out cylinder. Since it does not move, the detection lever of the switching means is held at a predetermined position without swinging, and during this period, the lock member takes the unlocked position and the limit valve takes the communicating position. The piston rod can move freely. On the other hand, in the vicinity where the door moves from the movement path in the take-out / retraction direction to the movement path in the opening / closing direction, the detection lever swings as the guided member moves in the opening / closing direction with respect to the guide rail. The swing of the detection lever is converted into the projecting movement of the lock member by the operation of the transmission mechanism, the lock member takes the lock position accordingly, and the swing is converted into the switching operation of the limit valve by the operation mechanism. , The limit valve is switched to the holding position. Therefore, if it is set so that the lock member and the limit valve can be switched when the guided member moves in the opening direction and the detection lever swings in the predetermined direction after the transition of the aforementioned path, the door can be opened and closed. The limit valve is in the holding position while the piston rod of the cylinder is mechanically locked by the lock member while it is on the movement path of the direction, and an extremely large external force acts on the door in the retracting direction during this time. However, a required gap is always secured between the door and the side wall of the vehicle, and the situation where the door and the side wall of the vehicle come into contact with each other during the automatic opening / closing or the manual opening / closing even in the case of a power failure does not occur. Also, because the limit valve is interlocked with the lock member to switch by swinging the detection lever, synchronization between the lock member and the limit valve can be facilitated, and the door can be opened and closed smoothly. It

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 19.

FIG. 1 shows a main structure of a plug door device according to the present invention. However, the entire structure of the device itself is substantially the same as the conventional example shown in FIG. Are omitted and common constituent elements are given the same reference numerals, and the description thereof will be omitted.
The points that differ from the conventional example shown in Fig. 20 will be described.

As shown in FIG. 1, the plug door device according to the present invention has a lock member 50 that takes a locked position that locks the piston rod 14a of the loading / unloading cylinder 14 and an unlocked position that locks the piston rod 14a, and the door 3 Is set to the unlocked position while it is located on the moving path in the take-out / retracting direction (ab direction) and to the locked position while the door 3 is located on the moving path in the opening / closing direction (cd direction). It has a switching means 51 for switching the position of the lock member 50. The switching means 51 includes a detection lever 53 that swings with the movement of the control plate 52 in the vicinity of the door 3 moving from the movement path in the take-out / drawing direction to the movement path in the opening / closing direction, and the detection lever 53. A transmission mechanism 54 that converts the swinging motion into a protruding and retracting motion of the lock member 50, and a valve built-in block 55 described later.
And a fan-shaped cam forming body 74 (operation mechanism shown in FIG. 7) for converting the switching operation of the limit valve 31 built in the. The control plate 52 is fixed to the lower surface of the guided member 8 (lower door front side member 8a) (see FIG. 2), and its plan view shape is an inclined surface parallel to the take-out / draw-in direction.
It has a pentagonal shape having 52a.

3 to 16 show the detection lever 53, the transmission mechanism 54,
Lock member 50, limit valve 31, and fan-shaped cam former 74
2 shows a specific configuration of.

First, a valve built-in block that contains the limit valve 31
The detection lever 53 is arranged on the lower surface side of 55, and the base end of the detection lever 53 is fixed to a support shaft 56 rotatably held at one end of the bubble-containing block 55. (See FIG. 6) In addition, a guide roller 57 that comes into contact with and separates from the control plate 52 is attached to the tip of the detection lever 53 (see FIG. 7).

The transmission mechanism 54 is disposed on the upper surface side of the valve built-in block 55 and is fixed to the support shaft 56 so that the detection lever 53 is provided.
An auxiliary lever 58 that swings integrally with the auxiliary lever 58 (see FIGS. 3, 6, and 8), a connecting rod 59 whose one end is rotatably connected to the tip of the auxiliary lever 58, and one end of which is the connecting rod.
It has a cam lever 60 rotatably connected to the other end of 59, and a tension coil spring 62 whose one end is locked to the tip of the auxiliary lever 58 and the other end is locked to a pin 61 (first
(See Figures 3 and 4). The cam lever 60 is slidably held in the longitudinal direction of the storage block 64 accommodating the lock member 50 (see FIGS. 13 and 15). Is the fulcrum pin 65a
A crank lever 65 that can be swung is held via the cam lever 60, and a first roller 66 attached to the crank lever 65 is in contact with a cam surface 60a formed on the cam lever 60.

Further, the lock member 50 (see FIGS. 14 and 16) is retained inside the storage block 64 so as to be capable of projecting and retracting in a direction intersecting with the crank lever 65, and the compression coil spring 68.
The lock member 50 is urged in the protruding direction by a concave groove 50a which is engaged with the second roller 67 attached to the crank lever 65.

The valve built-in block 55, the pin forming plate 63 on which the pin 61 is projected, and the storage block 64 are fixed to the mounting base 1x of the vehicle upper wall shown in FIG. Therefore, in FIG. 1, the portions marked with parallel slant lines schematically show the directly or indirectly fixed portions to the mounting base 1x, and the right side of the inlet / outlet cylinder 14 in FIG. A solenoid valve 26, which will be described later, and a silencer 69 connected to the atmosphere opening portion Ex of the solenoid valve 26 are provided.

With the above structure, the operation of the lock member 50 will be described.
When the door 3 is opened from the fully closed state, the guide rod 5a and the guided member 8 are guided by the first guide mechanism 4 by the piston rod 14a of the loading / unloading cylinder 14 shown in FIG. The guide roller 57 of the detection lever 53 is in contact with the inclined surface 52a of the control plate 52 fixed to the guided member 8 at the time of this movement. Since it is maintained, the detection lever 53 is held at the swinging end in the leftward direction indicated by the symbol X in the figure. Therefore, the cam lever 60 connected to the auxiliary lever 58 integrated with the detection lever 53 via the connecting rod 59 maintains the state of being held at the moving end to the left as shown in FIG. The locking member 50 is compressed by the engagement of the concave groove 50a and the second roller 67 with the compression coil spring 6
As shown in FIG. 14, it is held at the retracted end position against the biasing force of 8, and its tip is stored in the storage block 64. Accordingly, when the door 3 is moved in the carry-out direction, the piston rod 14a of the loading / unloading cylinder 14 and the wide head 14ax at the tip of the piston rod 14a can freely project and move without interfering with the tip of the lock member 50. Become.

Next, when the piston rod 14a of the loading / unloading cylinder 14 reaches the moving end in the carry-out direction, the control plate 52 reaches the position shown by the chain line in FIG. 1, and the detection lever 53 (guide roller 57) moves slightly. And swings to the right to reach the position indicated by symbol Y in the figure. Along with this, the cam lever 60 moves slightly to the right due to the urging force of the tension coil spring 62, and the cam surface moves.
At the same time when the contact position of the first roller 66 with respect to 60a changes, the crank lever 65 swings slightly clockwise from the position shown in FIG. 13, and the locking member 50 slightly projects from the state shown in FIG. Then, the tip end of the housing block 64 projects outward by a very short predetermined dimension (this state is not shown). Then, when the guided member 8 and the control plate 52 move in the opening direction (direction c) from the state shown by the chain line in FIG. 1, the detection lever 53 (guide roller 57) further swings to the right and the same. The position indicated by the symbol Z in the figure is reached. Along with this, the cam lever 60 is further moved to the right by the urging force of the tension coil spring 62, and the contact position of the first roller 66 with respect to the cam surface 60a is changed from before so that the crank lever 65 is moved.
Is further swung in the clockwise direction, and the lock member 50 is in a state of protruding by a required dimension from the storage block 64, as shown in FIG. This state is the lock member 50 in this embodiment.
However, the shape of the cam surface 60a of the cam lever 60 is appropriately changed to detect the detection lever 53 (guide roller).
It is also possible to set the lock member 50 to the locked position when 57) reaches the position indicated by the symbol Y in FIG. When the lock member 50 takes the lock position in this way, even if an external force acts in the pulling direction (b direction) on the door 3 and thus the guide rail 5a, the in-and-out cylinder 14
The wide head 14ax at the end of the piston rod 14a of the lock member 5
The piston rod 14a of the loading / unloading cylinder 14 is locked in the carry-out position by being locked at the tip of 0 and prevented from moving in the pull-in direction.

When the door 3 is closed from the fully open state, the operation opposite to the above is performed, and while the door 3 and the guided member 8 are being brought out, the cylinder is in and out while moving in the closing direction (d direction). The piston rod 14a of 14 is locked by the lock member 50 at the take-out position, and the piston rod 14a of the cylinder 14 is unlocked while the door 3 and the guided member 8 are moving in the retracting direction (direction b). It is said that

Further, the control device (fluid supply / discharge circuit) in the plug door device of the present embodiment is configured as shown in FIGS. 17, 18 and 19, and the first branch pipe line 27 and the second branch pipe line in these respective drawings are shown.
In the middle of 29, a two-position four-port type limit valve 31 and a fan-shaped cam forming member 74 for switching the limit valve 31 are installed. The concrete structure of the limit valve 31 and the fan-shaped cam forming member 74 is as follows. As shown in the figure.

That is, in FIG. 7, two plungers 31a, 31a are fitted and held in the valve built-in block 55 so as to be movable up and down while being biased downward by the first springs 70, 70. The individual spherical bodies 71, 71 are held by the respective second springs 72, 72 such that they can be seated on and separated from the valve seats 73, 73 in a state of being urged downward by the second springs 72, 72. And
On the upper surface of the fan-shaped cam forming member 74 (see FIG. 9) integrally attached to the detection lever 53, there is formed a cam surface on which the lower ends of the two plungers 31a, 31a abut. The cam surfaces are composed of first cam surfaces 75 and 75 and second cam surfaces 76 and 76, which have the same shape. In this case, the lower ends of the two plungers 31a and 31a are at the seventh position until the detection lever 53 shifts from the symbol X to the symbol Y in FIG. 1 (while the lock member 50 is in the unlocked state). As shown in the figure, by contacting the first cam surfaces 75, 75 and separating the spherical bodies 71, 71 from the valve seats 73, 73, the ports 77 and 7
8 and the ports 79 and 80 are in communication with each other, while the detection lever 53 shifts from the symbol Y to the symbol Z in FIG. 1 (the lock member 50 is in the locked state). In the case of), the two plungers 31a,
The lower end of 31a comes into contact with the second cam surfaces 76, 76 so that the spherical bodies 71, 71 can be seated on and separated from the valve seats 73, 73 by the action of fluid pressure, and act as check valves. Become. Therefore, as shown in FIG. 7, the state where the two plungers 31a, 31a are in contact with the first cam surfaces 75, 75 is shown in FIGS.
As shown in the figure, the first branch pipe line 27 and the second branch pipe line 29 correspond to a state in which they are communicated with each other through two internal passages 40 and 41, respectively, and the two plungers 31a and 31a are 2 cam surface 76,
As shown in FIG. 19, the state in which the first branch pipe 27 and the second branch pipe 29 are in contact with 76 is in one direction via two check valves 42 and 43 having different directions. This is equivalent to the state that only distribution is possible.

The outline of the operation of this control device is as follows. (It should be noted that in FIG.
The same components as those of the conventional example shown in FIGS. 1, 22, and 23 are designated by the same reference numerals, and the description thereof will be omitted. That is, when the door 3 is fully closed, the lock member 50 is in the unlocked state, and the limit valve 31 takes the position shown in FIG. By establishing a communication state via the two internal passages 40, 41 and by also taking the position of the solenoid valve 26 shown in FIG. 17,
This is substantially the same as the passage state shown in FIG. 21 in the above-mentioned conventional example. Further, when the door 3 is moved in the take-out direction, the position of only the solenoid valve 26 is switched to be in the state shown in FIG. 18, and in this case as well, it is substantially the same as the passage state shown in FIG. Becomes The position of the limit valve 31 is switched in synchronization with the switching of the lock member 50 to the locked state while the door 3 is moved in the opening direction with the door 3 brought out, and the holding position shown in FIG. However, below this position, the fluid pressure source 24
The compressed air that has reached the first branch line 27 through the first branch line 21 passes through one check valve 42 of the limit valve 31 and is supplied to the take-out side port 28 of the in-out cylinder 14 at the same time.
The port 30 on the retract side of the in / out cylinder 14 is a limit valve.
The solenoid valve 26 is in communication with the atmosphere opening portion Ex direction of the solenoid valve 26 via the other check valve 43 of 31.
The piston rod 14a of 14 is in a state where it is reliably biased and held in the take-out position. On the other hand, while the door 3 is brought out and moves in the closing direction, only the solenoid valve 26 is switched from the state shown in FIG. The backflow of the pressure fluid toward the atmosphere opening portion Ex of the solenoid valve 26 is blocked by the one-way check valve 42 of the limit valve 31, and the outflow of the pressure fluid from the fluid pressure source 24 toward the pull-in port 30 of the inlet / outlet cylinder 14. Is blocked by the other check valve 43 of the limit valve 31. Further, after the door 3 reaches the closing direction end in the movement path in the opening / closing direction, the lock member 50 is switched to the unlocked state by the operation of the detection lever 53, and the limit valve
31 becomes the communication position shown in FIG. 17, and the door 3 moves in the retracting direction as in the conventional case. In consideration of the features of the present invention, the configuration of the control device is not limited to the above, and may be the configuration shown in FIGS. 21 to 23 in the above-mentioned conventional example. .

〔The invention's effect〕

As described above, according to the plug door device of the present invention, the detection lever is swung in the vicinity where the door is moved from the moving path in the take-out / drawing direction to the moving path in the opening / closing direction, and the swing of the detection lever is transmitted to the transmission mechanism. By the operation, the lock member is converted into the protruding / retracting motion to switch the piston rod of the inlet / outlet cylinder to the locked state or the unlocked state, and the swing of the detection lever is further converted by the operation mechanism to switch the limit valve. , It is possible to mechanically lock the piston rod of the in-and-out cylinder, so that not only in the automatic operation but also in the manual operation (especially in the case of a power failure), when the door is moved in the opening / closing direction, it cannot be pulled in any direction. Even if an external force is applied, the movement of the door in the retracting direction is reliably and firmly prevented, and the door comes into contact with the vehicle side wall. Advantage of being prevented is obtained.
Further, by adopting a combination of a detection lever which is a mechanical means and a transmission mechanism without using a fluid pressure or an electric means, there is an advantage that it is not necessary to additionally install piping, wiring and the like. Furthermore, according to the present invention, since the lock member and the limit valve are interlocked and switched by the swing of the detection lever, it is easy to synchronize the lock member and the limit valve, and the opening and closing movement of the door can be further facilitated. Can be smooth. Further, since the limit valve can be arranged near the inlet / outlet cylinder, the inlet / outlet cylinder, the limit valve, the lock member and the detection lever,
The switching means including the transmission means and the cam mechanism can be unitized and attached, and the opening / closing device can be simplified. In this case, if a space between the inlet / outlet cylinder and the limit valve is attached to, for example, a pipe seat to form a unit, piping is not required, the switchgear can be simplified, and the mounting work and inspection / maintenance work are facilitated.

[Brief description of drawings]

1 to 19 show an embodiment of the present invention.
FIG. 1 is a schematic plan view showing a main structure of a plug door device according to the present invention, FIG. 2 is a vertical sectional side view taken along line II-II in FIG. 1, and FIG. 3 is a front view showing a structure of a switching means. Fig. 4 is a bottom view taken along the line IV-IV in Fig. 3, and Fig. 5 is Fig. 4V.
Fig. 6 is a side view taken along line -V, Fig. 6 is a vertical sectional front view showing the structure of the valve built-in block and its peripheral portion, and Fig. 7 is Fig. 6
Fig. VII-VII is a vertical sectional side view cut along the line; Fig. 8 is a plan view showing the structure of the valve built-in block and its peripheral portion.
FIG. 9 is a bottom view showing the structure of the valve built-in block and its peripheral portion, FIG. 10 is a front view showing the structure of the storage block and its peripheral portion, and FIG. 11 is a plan view showing the structure of the storage block and its peripheral portion. Fig. 12, Fig. 12 is a side view taken along the line VIII-VIII in Fig. 11, Fig. 13 is a plan view showing the internal structure of the storage block, and Fig. 14 is a longitudinal sectional view taken along the line IX-IX in Fig. 13. , FIG. 15 is a plan view showing the internal structure of the storage block,
FIG. 16 is a vertical sectional view taken along line XX of FIG.
7, 18 and 19 are schematic configuration diagrams showing the control device of the plug door device according to the present invention. Further, FIG. 20 is a schematic plan view showing the structure of a conventional plug door device, and FIGS. 21, 22 and 23 are schematic configuration diagrams showing a control device of the conventional plug door device, respectively. 1 ... Vehicle (vehicle side wall) 2 ... Opening portion 3 ... Door 4 ... Guide mechanism (first guide mechanism) 5 ... Guide mechanism (second guide mechanism) 5a ... Guide rail 8 ... Guided member 9 ... Open / close cylinder 14 ... Entry / exit Cylinder 14a ... Piston rod of inlet / outlet cylinder 31 ... Limit valve 50 ... Lock member 51 ... Switching means 53 ... Detection lever 54 ... Interlocking mechanism 74 ... Operating mechanism (fan-shaped cam former)

Claims (1)

[Claims] 1. A door opening / closing operation is performed by a movement in a take-out / drawing-in direction with respect to an opening of a vehicle and a movement in an opening / closing direction along a side wall of the vehicle.
A take-in / take-out cylinder for moving the door in the take-out / take-in direction along with the guide operation of the guide mechanism, and a cylinder rod connected to the take-in / take-out cylinder to extend in the opening / closing direction and movable only in the take-out / take-in direction. Guide rail, a guided member slidably held by the guide rail, movable in the opening / closing direction, and connected to the door, and the in-and-out cylinder when the door moves in the take-out / draw-in direction. In a plug door device comprising a limit valve which is switched to a communication position for driving and a holding position which restricts the movement of the in-and-out cylinder when moving in the opening and closing direction, in a vicinity of the in-and-out cylinder Along with this, the piston rod of the cylinder is locked and unlocked. A lock member that takes a non-locked position and a switching unit that switches the locked state of the lock member are provided, and the switching unit is provided in the vicinity where the door moves from the moving path in the take-out / drawing direction to the moving path in the opening / closing direction. A detection lever that swings as the guided member moves in the opening / closing direction with respect to the guide rail, a transmission mechanism that converts the swing of the detection lever into a protruding / retracting movement of the lock member, and a limit valve of the limit valve. A plug door device having a configuration having an operation mechanism for converting to a switching operation.